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163 Commits

Author SHA1 Message Date
Joel Brobecker
b811d2c292 Update copyright year range in all GDB files. 
gdb/ChangeLog:

        Update copyright year range in all GDB files.
 2020-01-01 10:20:53 +04:00
Tom Tromey
953cff5630 Change gcc_target_options to return std::string 
This patch was inspired by a recent review that recommended using
std::string in a new implementation of the gcc_target_options gdbarch
function.  It changes this function to return std::string rather than
an ordinary xmalloc'd string.

I believe this caught a latent memory leak in compile.c:get_args.

Tested on x86-64 Fedora 29.

gdb/ChangeLog
2019-10-15  Tom Tromey  <tromey@adacore.com>

	* gdbarch.h, gdbarch.c: Rebuild.
	* gdbarch.sh (gcc_target_options): Change return type to
	std::string.
	* compile/compile.c (get_args): Update.
	* nios2-tdep.c (nios2_gcc_target_options): Return std::string.
	* arm-linux-tdep.c (arm_linux_gcc_target_options): Return
	std::string.
	* aarch64-linux-tdep.c (aarch64_linux_gcc_target_options): Return
	std::string.
	* arch-utils.c (default_gcc_target_options): Return std::string.
	* arch-utils.h (default_gcc_target_options): Return std::string.
	* s390-tdep.c (s390_gcc_target_options): Return std::string.

Change-Id: I51f61703426a323089e646da8f22320a2cafbc1f
 2019-10-15 11:03:57 -06:00
Alan Hayward
aa7ca1bb44 Move [PAC] into a new MI field addr_flags 
Add a new print_pc which prints both the PC and a new field addr_flags.
Call this wherever the PC is printed in stack.c.

Add a new gdbarch method get_pc_address_flags to obtain the addr_flag
contents. By default returns an empty string, on AArch64 this returns
PAC if the address has been masked in the frame.

Document this in the manual and NEWS file.

gdb/ChangeLog:

	* NEWS (Other MI changes): New subsection.
	* aarch64-tdep.c (aarch64_get_pc_address_flags): New function.
	(aarch64_gdbarch_init): Add aarch64_get_pc_address_flags.
	* arch-utils.c (default_get_pc_address_flags): New function.
	* arch-utils.h (default_get_pc_address_flags): New declaration.
	* gdbarch.sh: Add get_pc_address_flags.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Likewise.
	* stack.c (print_pc): New function.
	(print_frame_info) (print_frame): Call print_pc.

gdb/doc/ChangeLog:

	* gdb.texinfo (AArch64 Pointer Authentication)
	(GDB/MI Breakpoint Information) (Frame Information): Document
	addr_field.
 2019-08-16 10:19:18 +01:00
Tom Tromey
0d12e84cfc Don't include gdbarch.h from defs.h 
I touched symtab.h and was surprised to see how many files were
rebuilt.  I looked into it a bit, and found that defs.h includes
gdbarch.h, which in turn includes many things.

gdbarch.h is only needed by a minority ofthe files in gdb, so this
patch removes the include from defs.h and updates the fallout.

I did "wc -l" on the files in build/gdb/.deps; this patch reduces the
line count from 139935 to 137030; so there are definitely future
build-time savings here.

Note that while I configured with --enable-targets=all, it's possible
that some *-nat.c file needs an update.  I could not test all of
these.  The buildbot caught a few problems along these lines.

gdb/ChangeLog
2019-07-10  Tom Tromey  <tom@tromey.com>

	* defs.h: Don't include gdbarch.h.
	* aarch64-ravenscar-thread.c, aarch64-tdep.c, alpha-bsd-tdep.h,
	alpha-linux-tdep.c, alpha-mdebug-tdep.c, arch-utils.h, arm-tdep.h,
	ax-general.c, btrace.c, buildsym-legacy.c, buildsym.h, c-lang.c,
	cli/cli-decode.h, cli/cli-dump.c, cli/cli-script.h,
	cli/cli-style.h, coff-pe-read.h, compile/compile-c-support.c,
	compile/compile-cplus.h, compile/compile-loc2c.c, corefile.c,
	cp-valprint.c, cris-linux-tdep.c, ctf.c, d-lang.c, d-namespace.c,
	dcache.c, dicos-tdep.c, dictionary.c, disasm-selftests.c,
	dummy-frame.c, dummy-frame.h, dwarf2-frame-tailcall.c,
	dwarf2expr.c, expression.h, f-lang.c, frame-base.c,
	frame-unwind.c, frv-linux-tdep.c, gdbarch-selftests.c, gdbtypes.h,
	go-lang.c, hppa-nbsd-tdep.c, hppa-obsd-tdep.c, i386-dicos-tdep.c,
	i386-tdep.h, ia64-vms-tdep.c, interps.h, language.c,
	linux-record.c, location.h, m2-lang.c, m32r-linux-tdep.c,
	mem-break.c, memattr.c, mn10300-linux-tdep.c, nios2-linux-tdep.c,
	objfiles.h, opencl-lang.c, or1k-linux-tdep.c, p-lang.c,
	parser-defs.h, ppc-tdep.h, probe.h, python/py-record-btrace.c,
	record-btrace.c, record.h, regcache-dump.c, regcache.h,
	riscv-fbsd-tdep.c, riscv-linux-tdep.c, rust-exp.y,
	sh-linux-tdep.c, sh-nbsd-tdep.c, source-cache.c,
	sparc-nbsd-tdep.c, sparc-obsd-tdep.c, sparc-ravenscar-thread.c,
	sparc64-fbsd-tdep.c, std-regs.c, target-descriptions.h,
	target-float.c, tic6x-linux-tdep.c, tilegx-linux-tdep.c, top.c,
	tracefile.c, trad-frame.c, type-stack.h, ui-style.c, utils.c,
	utils.h, valarith.c, valprint.c, varobj.c, x86-tdep.c,
	xml-support.h, xtensa-linux-tdep.c, cli/cli-cmds.h: Update.
	* s390-linux-nat.c, procfs.c, inf-ptrace.c: Likewise.
 2019-07-10 14:53:53 -06:00
Tom Tromey
1a5c25988e Normalize include guards in gdb 
While working on my other scripts to deal with gdb headers, I noticed
that some files were missing include guards.  I wrote a script to add
the missing ones, but found that using the obvious names for the
guards ran into clashes -- for example, gdb/nat/linux-nat.h used
"LINUX_NAT_H", but this was also the script's choice for
gdb/linux-nat.h.

So, I changed the script to normalize all include guards in gdb.  This
patch is the result.

As usual the script is available here:

    https://github.com/tromey/gdb-refactoring-scripts

Tested by rebuilding; I also ran it through "Fedora-x86_64-m64" on the
buildbot.

gdb/ChangeLog
2019-02-07  Tom Tromey  <tom@tromey.com>

	* yy-remap.h: Add include guard.
	* xtensa-tdep.h: Add include guard.
	* xcoffread.h: Rename include guard.
	* varobj-iter.h: Add include guard.
	* tui/tui.h: Rename include guard.
	* tui/tui-winsource.h: Rename include guard.
	* tui/tui-wingeneral.h: Rename include guard.
	* tui/tui-windata.h: Rename include guard.
	* tui/tui-win.h: Rename include guard.
	* tui/tui-stack.h: Rename include guard.
	* tui/tui-source.h: Rename include guard.
	* tui/tui-regs.h: Rename include guard.
	* tui/tui-out.h: Rename include guard.
	* tui/tui-layout.h: Rename include guard.
	* tui/tui-io.h: Rename include guard.
	* tui/tui-hooks.h: Rename include guard.
	* tui/tui-file.h: Rename include guard.
	* tui/tui-disasm.h: Rename include guard.
	* tui/tui-data.h: Rename include guard.
	* tui/tui-command.h: Rename include guard.
	* tic6x-tdep.h: Add include guard.
	* target/waitstatus.h: Rename include guard.
	* target/wait.h: Rename include guard.
	* target/target.h: Rename include guard.
	* target/resume.h: Rename include guard.
	* target-float.h: Rename include guard.
	* stabsread.h: Add include guard.
	* rs6000-tdep.h: Add include guard.
	* riscv-fbsd-tdep.h: Add include guard.
	* regformats/regdef.h: Rename include guard.
	* record.h: Rename include guard.
	* python/python.h: Rename include guard.
	* python/python-internal.h: Rename include guard.
	* python/py-stopevent.h: Rename include guard.
	* python/py-ref.h: Rename include guard.
	* python/py-record.h: Rename include guard.
	* python/py-record-full.h: Rename include guard.
	* python/py-record-btrace.h: Rename include guard.
	* python/py-instruction.h: Rename include guard.
	* python/py-events.h: Rename include guard.
	* python/py-event.h: Rename include guard.
	* procfs.h: Add include guard.
	* proc-utils.h: Add include guard.
	* p-lang.h: Add include guard.
	* or1k-tdep.h: Rename include guard.
	* observable.h: Rename include guard.
	* nto-tdep.h: Rename include guard.
	* nat/x86-linux.h: Rename include guard.
	* nat/x86-linux-dregs.h: Rename include guard.
	* nat/x86-gcc-cpuid.h: Add include guard.
	* nat/x86-dregs.h: Rename include guard.
	* nat/x86-cpuid.h: Rename include guard.
	* nat/ppc-linux.h: Rename include guard.
	* nat/mips-linux-watch.h: Rename include guard.
	* nat/linux-waitpid.h: Rename include guard.
	* nat/linux-ptrace.h: Rename include guard.
	* nat/linux-procfs.h: Rename include guard.
	* nat/linux-osdata.h: Rename include guard.
	* nat/linux-nat.h: Rename include guard.
	* nat/linux-namespaces.h: Rename include guard.
	* nat/linux-btrace.h: Rename include guard.
	* nat/glibc_thread_db.h: Rename include guard.
	* nat/gdb_thread_db.h: Rename include guard.
	* nat/gdb_ptrace.h: Rename include guard.
	* nat/fork-inferior.h: Rename include guard.
	* nat/amd64-linux-siginfo.h: Rename include guard.
	* nat/aarch64-sve-linux-sigcontext.h: Rename include guard.
	* nat/aarch64-sve-linux-ptrace.h: Rename include guard.
	* nat/aarch64-linux.h: Rename include guard.
	* nat/aarch64-linux-hw-point.h: Rename include guard.
	* mn10300-tdep.h: Add include guard.
	* mips-linux-tdep.h: Add include guard.
	* mi/mi-parse.h: Rename include guard.
	* mi/mi-out.h: Rename include guard.
	* mi/mi-main.h: Rename include guard.
	* mi/mi-interp.h: Rename include guard.
	* mi/mi-getopt.h: Rename include guard.
	* mi/mi-console.h: Rename include guard.
	* mi/mi-common.h: Rename include guard.
	* mi/mi-cmds.h: Rename include guard.
	* mi/mi-cmd-break.h: Rename include guard.
	* m2-lang.h: Add include guard.
	* location.h: Rename include guard.
	* linux-record.h: Rename include guard.
	* linux-nat.h: Add include guard.
	* linux-fork.h: Add include guard.
	* i386-darwin-tdep.h: Rename include guard.
	* hppa-linux-offsets.h: Add include guard.
	* guile/guile.h: Rename include guard.
	* guile/guile-internal.h: Rename include guard.
	* gnu-nat.h: Rename include guard.
	* gdb-stabs.h: Rename include guard.
	* frv-tdep.h: Add include guard.
	* f-lang.h: Add include guard.
	* event-loop.h: Add include guard.
	* darwin-nat.h: Rename include guard.
	* cp-abi.h: Rename include guard.
	* config/sparc/nm-sol2.h: Rename include guard.
	* config/nm-nto.h: Rename include guard.
	* config/nm-linux.h: Add include guard.
	* config/i386/nm-i386gnu.h: Rename include guard.
	* config/djgpp/nl_types.h: Rename include guard.
	* config/djgpp/langinfo.h: Rename include guard.
	* compile/gcc-cp-plugin.h: Add include guard.
	* compile/gcc-c-plugin.h: Add include guard.
	* compile/compile.h: Rename include guard.
	* compile/compile-object-run.h: Rename include guard.
	* compile/compile-object-load.h: Rename include guard.
	* compile/compile-internal.h: Rename include guard.
	* compile/compile-cplus.h: Rename include guard.
	* compile/compile-c.h: Rename include guard.
	* common/xml-utils.h: Rename include guard.
	* common/x86-xstate.h: Rename include guard.
	* common/version.h: Rename include guard.
	* common/vec.h: Rename include guard.
	* common/tdesc.h: Rename include guard.
	* common/selftest.h: Rename include guard.
	* common/scoped_restore.h: Rename include guard.
	* common/scoped_mmap.h: Rename include guard.
	* common/scoped_fd.h: Rename include guard.
	* common/safe-iterator.h: Rename include guard.
	* common/run-time-clock.h: Rename include guard.
	* common/refcounted-object.h: Rename include guard.
	* common/queue.h: Rename include guard.
	* common/ptid.h: Rename include guard.
	* common/print-utils.h: Rename include guard.
	* common/preprocessor.h: Rename include guard.
	* common/pathstuff.h: Rename include guard.
	* common/observable.h: Rename include guard.
	* common/netstuff.h: Rename include guard.
	* common/job-control.h: Rename include guard.
	* common/host-defs.h: Rename include guard.
	* common/gdb_wait.h: Rename include guard.
	* common/gdb_vecs.h: Rename include guard.
	* common/gdb_unlinker.h: Rename include guard.
	* common/gdb_unique_ptr.h: Rename include guard.
	* common/gdb_tilde_expand.h: Rename include guard.
	* common/gdb_sys_time.h: Rename include guard.
	* common/gdb_string_view.h: Rename include guard.
	* common/gdb_splay_tree.h: Rename include guard.
	* common/gdb_setjmp.h: Rename include guard.
	* common/gdb_ref_ptr.h: Rename include guard.
	* common/gdb_optional.h: Rename include guard.
	* common/gdb_locale.h: Rename include guard.
	* common/gdb_assert.h: Rename include guard.
	* common/filtered-iterator.h: Rename include guard.
	* common/filestuff.h: Rename include guard.
	* common/fileio.h: Rename include guard.
	* common/environ.h: Rename include guard.
	* common/common-utils.h: Rename include guard.
	* common/common-types.h: Rename include guard.
	* common/common-regcache.h: Rename include guard.
	* common/common-inferior.h: Rename include guard.
	* common/common-gdbthread.h: Rename include guard.
	* common/common-exceptions.h: Rename include guard.
	* common/common-defs.h: Rename include guard.
	* common/common-debug.h: Rename include guard.
	* common/cleanups.h: Rename include guard.
	* common/buffer.h: Rename include guard.
	* common/btrace-common.h: Rename include guard.
	* common/break-common.h: Rename include guard.
	* cli/cli-utils.h: Rename include guard.
	* cli/cli-style.h: Rename include guard.
	* cli/cli-setshow.h: Rename include guard.
	* cli/cli-script.h: Rename include guard.
	* cli/cli-interp.h: Rename include guard.
	* cli/cli-decode.h: Rename include guard.
	* cli/cli-cmds.h: Rename include guard.
	* charset-list.h: Add include guard.
	* buildsym-legacy.h: Rename include guard.
	* bfin-tdep.h: Add include guard.
	* ax.h: Rename include guard.
	* arm-linux-tdep.h: Add include guard.
	* arm-fbsd-tdep.h: Add include guard.
	* arch/xtensa.h: Rename include guard.
	* arch/tic6x.h: Add include guard.
	* arch/i386.h: Add include guard.
	* arch/arm.h: Rename include guard.
	* arch/arm-linux.h: Rename include guard.
	* arch/arm-get-next-pcs.h: Rename include guard.
	* arch/amd64.h: Add include guard.
	* arch/aarch64-insn.h: Rename include guard.
	* arch-utils.h: Rename include guard.
	* annotate.h: Add include guard.
	* amd64-darwin-tdep.h: Rename include guard.
	* aarch64-linux-tdep.h: Add include guard.
	* aarch64-fbsd-tdep.h: Add include guard.
	* aarch32-linux-nat.h: Add include guard.

gdb/gdbserver/ChangeLog
2019-02-07  Tom Tromey  <tom@tromey.com>

	* x86-tdesc.h: Rename include guard.
	* x86-low.h: Add include guard.
	* wincecompat.h: Rename include guard.
	* win32-low.h: Add include guard.
	* utils.h: Rename include guard.
	* tracepoint.h: Rename include guard.
	* tdesc.h: Rename include guard.
	* target.h: Rename include guard.
	* server.h: Rename include guard.
	* remote-utils.h: Rename include guard.
	* regcache.h: Rename include guard.
	* nto-low.h: Rename include guard.
	* notif.h: Add include guard.
	* mem-break.h: Rename include guard.
	* lynx-low.h: Add include guard.
	* linux-x86-tdesc.h: Add include guard.
	* linux-s390-tdesc.h: Add include guard.
	* linux-ppc-tdesc-init.h: Add include guard.
	* linux-low.h: Add include guard.
	* linux-aarch64-tdesc.h: Add include guard.
	* linux-aarch32-low.h: Add include guard.
	* inferiors.h: Rename include guard.
	* i387-fp.h: Rename include guard.
	* hostio.h: Rename include guard.
	* gdbthread.h: Rename include guard.
	* gdb_proc_service.h: Rename include guard.
	* event-loop.h: Rename include guard.
	* dll.h: Rename include guard.
	* debug.h: Rename include guard.
	* ax.h: Rename include guard.
 2019-02-07 03:27:23 -07:00
Joel Brobecker
42a4f53d2b Update copyright year range in all GDB files. 
This commit applies all changes made after running the gdb/copyright.py
script.

Note that one file was flagged by the script, due to an invalid
copyright header
(gdb/unittests/basic_string_view/element_access/char/empty.cc).
As the file was copied from GCC's libstdc++-v3 testsuite, this commit
leaves this file untouched for the time being; a patch to fix the header
was sent to gcc-patches first.

gdb/ChangeLog:

	Update copyright year range in all GDB files.
 2019-01-01 10:01:51 +04:00
Tom Tromey
2b4424c35b Add initial type alignment support 
This adds some basic type alignment support to gdb.  It changes struct
type to store the alignment, and updates dwarf2read.c to handle
DW_AT_alignment.  It also adds a new gdbarch method and updates
i386-tdep.c.

None of this new functionality is used anywhere yet, so tests will
wait until the next patch.

2018-04-30  Tom Tromey  <tom@tromey.com>

	* i386-tdep.c (i386_type_align): New function.
	(i386_gdbarch_init): Update.
	* gdbarch.sh (type_align): New method.
	* gdbarch.c, gdbarch.h: Rebuild.
	* arch-utils.h (default_type_align): Declare.
	* arch-utils.c (default_type_align): New function.
	* gdbtypes.h (TYPE_ALIGN_BITS): New define.
	(struct type) <align_log2>: New field.
	<instance_flags>: Now a bitfield.
	(TYPE_RAW_ALIGN): New macro.
	(type_align, type_raw_align, set_type_align): Declare.
	* gdbtypes.c (type_align, type_raw_align, set_type_align): New
	functions.
	* dwarf2read.c (quirk_rust_enum): Set type alignment.
	(get_alignment, maybe_set_alignment): New functions.
	(read_structure_type, read_enumeration_type, read_array_type)
	(read_set_type, read_tag_pointer_type, read_tag_reference_type)
	(read_subrange_type, read_base_type): Set type alignment.
 2018-04-30 11:25:30 -06:00
Markus Metzger
1d509aa625 infrun: step through indirect branch thunks 
With version 7.3 GCC supports new options

   -mindirect-branch=<choice>
   -mfunction-return=<choice>

The choices are:

    keep                behaves as before
    thunk               jumps through a thunk
    thunk-external      jumps through an external thunk
    thunk-inline        jumps through an inlined thunk

For thunk and thunk-external, GDB would, on a call to the thunk, step into
the thunk and then resume to its caller assuming that this is an
undebuggable function.  On a return thunk, GDB would stop inside the
thunk.

Make GDB step through such thunks instead.

Before:
    Temporary breakpoint 1, main ()
        at gdb.base/step-indirect-call-thunk.c:37
    37        x = apply (inc, 41);
    (gdb) s
    apply (op=0x80483e6 <inc>, x=41)
        at gdb.base/step-indirect-call-thunk.c:29
    29        return op (x);
    (gdb)
    30      }

After:
    Temporary breakpoint 1, main ()
        at gdb.base/step-indirect-call-thunk.c:37
    37        x = apply (inc, 41);
    (gdb) s
    apply (op=0x80483e6 <inc>, x=41)
        at gdb.base/step-indirect-call-thunk.c:29
    29        return op (x);
    (gdb)
    inc (x=41) at gdb.base/step-indirect-call-thunk.c:23
    23        return x + 1;

This is independent of the step-mode.  In order to step into the thunk,
you would need to use stepi.

When stepping over an indirect call thunk, GDB would first step through
the thunk, then recognize that it stepped into a sub-routine and resume to
the caller (of the thunk).  Not sure whether this is worth optimizing.

Thunk detection is implemented via gdbarch.  I implemented the methods for
IA.  Other architectures may run into unexpected fails.

The tests assume a fixed number of instruction steps to reach a thunk.
This depends on the compiler as well as the architecture.  They may need
adjustments when we add support for more architectures.  Or we can simply
drop those tests that cover being able to step into thunks using
instruction stepping.

When using an older GCC, the tests will fail to build and will be reported
as untested:

    Running .../gdb.base/step-indirect-call-thunk.exp ...
    gdb compile failed, \
    gcc: error: unrecognized command line option '-mindirect-branch=thunk'
    gcc: error: unrecognized command line option '-mfunction-return=thunk'

                    === gdb Summary ===

    # of untested testcases         1

gdb/
	* infrun.c (process_event_stop_test): Call
	gdbarch_in_indirect_branch_thunk.
	* gdbarch.sh (in_indirect_branch_thunk): New.
	* gdbarch.c: Regenerated.
	* gdbarch.h: Regenerated.
	* x86-tdep.h: New.
	* x86-tdep.c: New.
	* Makefile.in (ALL_TARGET_OBS): Add x86-tdep.o.
	(HFILES_NO_SRCDIR): Add x86-tdep.h.
	(ALLDEPFILES): Add x86-tdep.c.
	* arch-utils.h (default_in_indirect_branch_thunk): New.
	* arch-utils.c (default_in_indirect_branch_thunk): New.
	* i386-tdep: Include x86-tdep.h.
	(i386_in_indirect_branch_thunk): New.
	(i386_elf_init_abi): Set in_indirect_branch_thunk gdbarch
	function.
	* amd64-tdep: Include x86-tdep.h.
	(amd64_in_indirect_branch_thunk): New.
	(amd64_init_abi): Set in_indirect_branch_thunk gdbarch function.

testsuite/
	* gdb.base/step-indirect-call-thunk.exp: New.
	* gdb.base/step-indirect-call-thunk.c: New.
	* gdb.reverse/step-indirect-call-thunk.exp: New.
	* gdb.reverse/step-indirect-call-thunk.c: New.
 2018-04-13 10:44:47 +02:00
Tom Tromey
281d762b1a Remove cleanups from check_fast_tracepoint_sals 
This changes the gdbarch fast_tracepoint_valid_at method to use a
std::string as its out parameter, and then updates all the uses.  This
allows removing a cleanup from breakpoint.c.

Regression tested by the buildbot.

ChangeLog
2018-02-24  Tom Tromey  <tom@tromey.com>

	* i386-tdep.c (i386_fast_tracepoint_valid_at): "msg" now a
	std::string.
	* gdbarch.sh (fast_tracepoint_valid_at): Change "msg" to a
	std::string*.
	* gdbarch.c: Rebuild.
	* gdbarch.h: Rebuild.
	* breakpoint.c (check_fast_tracepoint_sals): Use std::string.
	* arch-utils.h (default_fast_tracepoint_valid_at): Update.
	* arch-utils.c (default_fast_tracepoint_valid_at): "msg" now a
	std::string*.
 2018-02-24 10:01:11 -07:00
Joel Brobecker
e2882c8578 Update copyright year range in all GDB files 
gdb/ChangeLog:

        Update copyright year range in all GDB files
 2018-01-02 07:38:06 +04:00
Simon Marchi
c2508e905f Remove simple_displaced_step_copy_insn 
Nothing uses this function.  Remove it, and adjust comments referring to
it.

gdb/ChangeLog:

	* arch-utils.h (simple_displaced_step_copy_insn): Remove.
	* arch-utils.c (simple_displaced_step_copy_insn): Remove.
	* gdbarch.sh (displaced_step_copy_insn): Adjust comment.
	* gdbarch.h: Regenerate.
	* i386-linux-tdep.c (i386_linux_displaced_step_copy_insn):
	Adjust comment.
	* i386-tdep.c (i386_displaced_step_copy_insn): Adjust comment.
	(i386_displaced_step_fixup): Adjust comment.
	* rs6000-tdep.c (ppc_displaced_step_copy_insn): Adjust comment.
 2017-10-12 21:42:23 -04:00
Yao Qi
46a62268b8 Catch exceptions thrown from gdbarch_skip_prologue 
PR 21555 is caused by the exception during the prologue analysis when re-set
a breakpoint.

(gdb) bt
 #0  memory_error_message (err=TARGET_XFER_E_IO, gdbarch=0x153db50, memaddr=93824992233232) at ../../binutils-gdb/gdb/corefile.c:192
 #1  0x00000000005718ed in memory_error (err=TARGET_XFER_E_IO, memaddr=memaddr@entry=93824992233232) at ../../binutils-gdb/gdb/corefile.c:220
 #2  0x00000000005719d6 in read_memory_object (object=object@entry=TARGET_OBJECT_CODE_MEMORY, memaddr=93824992233232, memaddr@entry=1, myaddr=myaddr@entry=0x7fffffffd0a0 "P\333S\001", len=len@entry=1) at ../../binutils-gdb/gdb/corefile.c:259
 #3  0x0000000000571c6e in read_code (len=1, myaddr=0x7fffffffd0a0 "P\333S\001", memaddr=<optimized out>) at ../../binutils-gdb/gdb/corefile.c:287
 #4  read_code_unsigned_integer (memaddr=memaddr@entry=93824992233232, len=len@entry=1, byte_order=byte_order@entry=BFD_ENDIAN_LITTLE)                          at ../../binutils-gdb/gdb/corefile.c:362
 #5  0x000000000041d4a0 in amd64_analyze_prologue (gdbarch=gdbarch@entry=0x153db50, pc=pc@entry=93824992233232, current_pc=current_pc@entry=18446744073709551615, cache=cache@entry=0x7fffffffd1e0) at ../../binutils-gdb/gdb/amd64-tdep.c:2310
 #6  0x000000000041e404 in amd64_skip_prologue (gdbarch=0x153db50, start_pc=93824992233232) at ../../binutils-gdb/gdb/amd64-tdep.c:2459
 #7  0x000000000067bfb0 in skip_prologue_sal (sal=sal@entry=0x7fffffffd4e0) at ../../binutils-gdb/gdb/symtab.c:3628
 #8  0x000000000067c4d8 in find_function_start_sal (sym=sym@entry=0x1549960, funfirstline=1) at ../../binutils-gdb/gdb/symtab.c:3501
 #9  0x000000000060999d in symbol_to_sal (result=result@entry=0x7fffffffd5f0, funfirstline=<optimized out>, sym=sym@entry=0x1549960) at ../../binutils-gdb/gdb/linespec.c:3860
....
 #16 0x000000000054b733 in location_to_sals (b=b@entry=0x15792d0, location=0x157c230, search_pspace=search_pspace@entry=0x1148120, found=found@entry=0x7fffffffdc64) at ../../binutils-gdb/gdb/breakpoint.c:14211
 #17 0x000000000054c1f5 in breakpoint_re_set_default (b=0x15792d0) at ../../binutils-gdb/gdb/breakpoint.c:14301
 #18 0x00000000005412a9 in breakpoint_re_set_one (bint=bint@entry=0x15792d0) at ../../binutils-gdb/gdb/breakpoint.c:14412

This problem can be fixed by

 - either each prologue analyzer doesn't throw exception,
 - or catch the exception thrown from gdbarch_skip_prologue,

I choose the latter because the former needs to fix *every* prologue
analyzer to not throw exception.

This error can be reproduced by changing reread.exp.  The test reread.exp
has already test that breakpoint can be reset correctly after the
executable is re-read.  This patch extends this test by compiling test c
file with and without -fPIE.

(gdb) run ^M
The program being debugged has been started already.^M
Start it from the beginning? (y or n) y^M
x86_64/gdb/testsuite/outputs/gdb.base/reread/reread' has changed; re-reading symbols.
Error in re-setting breakpoint 1: Cannot access memory at address 0x555555554790^M
Error in re-setting breakpoint 2: Cannot access memory at address 0x555555554790^M
Starting program: /scratch/yao/gdb/build-git/x86_64/gdb/testsuite/outputs/gdb.base/reread/reread ^M
This is foo^M
[Inferior 1 (process 27720) exited normally]^M
(gdb) FAIL: gdb.base/reread.exp: opts= "-fPIE" "ldflags=-pie" : run to foo() second time (the program exited)

This patch doesn't re-indent the code, to keep the patch simple.

gdb:

2017-07-25  Yao Qi  <yao.qi@linaro.org>

	PR gdb/21555
	* arch-utils.c (gdbarch_skip_prologue_noexcept): New function.
	* arch-utils.h (gdbarch_skip_prologue_noexcept): Declare.
	* infrun.c: Include arch-utils.h
	(handle_step_into_function): Call gdbarch_skip_prologue_noexcept.
	(handle_step_into_function_backward): Likewise.
	* symtab.c (skip_prologue_sal): Likewise.

gdb/testsuite:

2017-07-25  Yao Qi  <yao.qi@linaro.org>

	PR gdb/21555
	* gdb.base/reread.exp: Wrap the whole test with two kinds of
	compilation flags, with -fPIE and without -fPIE.
 2017-07-25 11:38:50 +01:00
Simon Marchi
6d45d4b42b gdbarch: Remove displaced_step_free_closure 
The displaced_step_free_closure gdbarch hook allows architectures to
free data they might have allocated to complete a displaced step.
However, all architectures using that hook use the
simple_displaced_step_free_closure provided in arch-utils.{c,h}, which
does a simple xfree.  We can remove it and do an xfree directly instead
of calling the hook.

gdb/ChangeLog:

	* gdbarch.sh (displaced_step_free_closure): Remove.
	* gdbarch.h, gdbarch.c: Re-generate.
	* aarch64-linux-tdep.c (aarch64_linux_init_abi): Don't set
	displaced_step_free_closure.
	* amd64-linux-tdep.c (amd64_linux_init_abi_common): Likewise.
	* arm-linux-tdep.c (arm_linux_init_abi): Likewise.
	* i386-linux-tdep.c (i386_linux_init_abi): Likewise.
	* rs6000-aix-tdep.c (rs6000_aix_init_osabi): Likewise.
	* rs6000-tdep.c (rs6000_gdbarch_init): Likewise.
	* s390-linux-tdep.c (s390_gdbarch_init): Likewise.
	* arch-utils.h (simple_displaced_step_free_closure): Remove.
	* arch-utils.c (simple_displaced_step_free_closure): Remove.
	* infrun.c (displaced_step_clear): Call xfree instead of
	gdbarch_displaced_step_free_closure.
 2017-06-10 00:24:50 +02:00
Yao Qi
39503f8242 Delegate opcodes to select disassembler in GDB 
This patch changes GDB to use disassembler selected by opcodes in
default, so that we don't have to duplicate the selection logic again
in GDB side.  For example, gdb/score-tdep.c has

static int
score_print_insn (bfd_vma memaddr, struct disassemble_info *info)
{
  if (info->endian == BFD_ENDIAN_BIG)
    return print_insn_big_score (memaddr, info);
  else
    return print_insn_little_score (memaddr, info);
}

and opcodes/disassemble.c has the same logic,

    case bfd_arch_score:
      if (big)
	disassemble = print_insn_big_score;
      else
	disassemble = print_insn_little_score;

This patch removes the logic in GDB and calls
opcodes/disassemble.c:disassembler in default to select disassembler.

gdb:

2017-05-24  Yao Qi  <yao.qi@linaro.org>

	* alpha-tdep.c (alpha_gdbarch_init): Don't call
	set_gdbarch_print_insn.
	* arc-tdep.c (arc_gdbarch_init): Likewise.
	* arch-utils.c: include dis-asm.h.
	(default_print_insn): New function.
	* arch-utils.h (default_print_insn): Declare.
	* avr-tdep.c (avr_gdbarch_init): Don't call set_gdbarch_print_insn.
	* bfin-tdep.c (bfin_gdbarch_init): Likewise.
	* cris-tdep.c (cris_delayed_get_disassembler): Remove.
	(cris_gdbarch_init): Don't call set_gdbarch_print_insn.
	* frv-tdep.c (frv_gdbarch_init): Likewise.
	* ft32-tdep.c (ft32_gdbarch_init): Likewise.
	* gdbarch.sh (print_insn): Use default_print_insn.
	* gdbarch.c: Regenerated.
	* hppa-tdep.c (hppa_gdbarch_init): Likewise.
	* iq2000-tdep.c (iq2000_gdbarch_init): Likewise.
	* lm32-tdep.c (lm32_gdbarch_init): Likewise.
	* m32c-tdep.c (m32c_gdbarch_init): Likewise.
	* m32r-tdep.c (m32r_gdbarch_init): Likewise.
	* m68hc11-tdep.c (gdb_print_insn_m68hc11): Remove.
	(m68hc11_gdbarch_init): Don't call set_gdbarch_print_insn.
	* m68k-tdep.c (m68k_gdbarch_init): Likewise.
	* m88k-tdep.c (m88k_gdbarch_init): Likewise.
	* microblaze-tdep.c (microblaze_gdbarch_init): Likewise.
	* mn10300-tdep.c (mn10300_gdbarch_init): Likewise.
	* moxie-tdep.c (moxie_gdbarch_init): Likewise.
	* msp430-tdep.c (msp430_gdbarch_init): Likewise.
	* mt-tdep.c (mt_gdbarch_init): Likewise.
	* nds32-tdep.c (nds32_gdbarch_init): Likewise.
	* nios2-tdep.c (nios2_print_insn): Remove.
	(nios2_gdbarch_init): Don't call set_gdbarch_print_insn.
	* rx-tdep.c (rx_gdbarch_init): Likewise.
	* s390-linux-tdep.c (s390_gdbarch_init): Likewise.
	* score-tdep.c (score_print_insn): Remove.
	(score_gdbarch_init): Don't call set_gdbarch_print_insn.
	* sh-tdep.c (sh_gdbarch_init): Likewise.
	* sh64-tdep.c (sh64_gdbarch_init): Likewise.
	* sparc-tdep.c (sparc32_gdbarch_init): Likewise.
	* tic6x-tdep.c (tic6x_print_insn): Remove.
	(tic6x_gdbarch_init): Don't call set_gdbarch_print_insn.
	* tilegx-tdep.c (tilegx_gdbarch_init): Likewise.
	* v850-tdep.c (v850_gdbarch_init): Likewise.
	* vax-tdep.c (vax_gdbarch_init): Likewise.
	* xstormy16-tdep.c (xstormy16_gdbarch_init): Likewise.
	* xtensa-tdep.c (xtensa_gdbarch_init): Likewise.
 2017-05-24 17:23:52 +01:00
Jiong Wang
b41c5a85a7 [gdbarch] New method "execute_dwarf_cfa_vendor_op" and migrate SPARC to it 
Recently a feature called "return address signing" has been added to GCC to
prevent stack smash stack on AArch64.  For details please refer:

  https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00376.html

GDB needs to be aware of this feature so it can restore the original return
address which is critical for unwinding.

On compiler side, whenever return address, i.e. LR register, is mangled or
restored by hardware instruction, compiler is expected to generate a
DW_CFA_AARCH64_negate_ra_state to toggle return address signing status.

DW_CFA_AARCH64_negate_ra_state is using the same CFI number and
therefore need to be multiplexed with DW_CFA_GNU_window_save which was designed
for SPARC.

A new gdbarch method "execute_dwarf_cfa_vendor_op" is introduced by this patch.
It's parameters has been restricted to those only needed by SPARC and AArch64
for multiplexing DW_CFA_GNU_window_save which is a CFI operation takes none
operand.  Should any further DWARF CFI operation want to be multiplexed in the
future,  the parameter list can be extended.  Below is the current function
prototype.

   typedef int (gdbarch_execute_dwarf_cfa_vendor_op_ftype)
     (struct gdbarch *gdbarch, gdb_byte op, struct dwarf2_frame_state *fs);

DW_CFA_GNU_window_save support for SPARC is migrated to this new gdbarch
method by this patch.

gdb/
	* gdbarch.sh: New gdbarch method execute_dwarf_cfa_vendor_op.
	* gdbarch.c: Regenerated.
	* gdbarch.h: Regenerated.
	* dwarf2-frame.c (dwarf2_frame_state_alloc_regs): Made the
	visibility external.
	(execute_cfa_program): Call execute_dwarf_cfa_vendor_op for CFI
	between DW_CFA_lo_user and DW_CFA_high_user inclusive.
	(enum cfa_how_kind): Move to ...
	(struct dwarf2_frame_state_reg_info): Likewise.
	(struct dwarf2_frame_state): Likewise.
	* dwarf2-frame.h: ... here.
	(dwarf2_frame_state_alloc_regs): New declaration.
	* sparc-tdep.c (sparc_execute_dwarf_cfa_vendor_op): New function.
	(sparc32_gdbarch_init): Register execute_dwarf_cfa_vendor_op hook.
 2017-04-26 14:05:03 +01:00
Joel Brobecker
61baf725ec update copyright year range in GDB files 
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.

gdb/ChangeLog:

        Update copyright year range in all GDB files.
 2017-01-01 10:52:34 +04:00
Yao Qi
04180708ef Remove GDBARCH_BREAKPOINT_MANIPULATION and SET_GDBARCH_BREAKPOINT_MANIPULATION 
Both of them are used in conversion.  We can remove them since the
conversion is done.

There are many architectures only have one breakpoint instruction,
so their gdbarch methods breakpoint_kind_from_pc and
sw_breakpoint_from_kind look very similar.  Instead of macro, we
use template "template <size_t, const gdb_byte *> struct bp_manipulation"
for these architectures.  In order to use template, I also change
breakpoint instruction of type "static const gdb_byte[]" to
"constexpr gdb_byte[]", and rename them to ARCH_break_insn.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>
	    Pedro Alves <palves@redhat.com>

	* aarch64-tdep.c (aarch64_default_breakpoint): Change it to
	constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(aarch64_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* alpha-tdep.c (break_insn): Rename to alpha_break_insn.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(alpha_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* arc-tdep.c (arc_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* arch-utils.h (GDBARCH_BREAKPOINT_MANIPULATION): Remove.
	(struct bp_manipulation): New.
	(SET_GDBARCH_BREAKPOINT_MANIPULATION): Remove.
	(struct bp_manipulation_endian): New.
	(BP_MANIPULATION): New.
	(BP_MANIPULATION_ENDIAN): New.
	* arm-tdep.c (arm_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* avr-tdep.c (avr_break_insn): Change it constexpr.
	(avr_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* bfin-tdep.c (bfin_gdbarch_init): Likewise.
	* cris-tdep.c (cris_gdbarch_init): Likewise.
	* frv-tdep.c (breakpoint): Rename it to frv_break_insn, and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(frv_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* ft32-tdep.c (breakpoint): Rename it to ft32_break_insn and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(ft32_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* h8300-tdep.c (breakpoint): Rename it to h8300_break_insn.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(h8300_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* hppa-tdep.c (breakpoint): Rename it to h8300_break_insn.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(hppa_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* i386-tdep.c (break_insn): Rename it to i386_break_insn.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(i386_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* iq2000-tdep.c (iq2000_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* lm32-tdep.c (breakpoint): Rename it to lm32_break_insn and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(lm32_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* m32c-tdep.c (break_insn): Rename it to m32c_break_insn and change
	its type to constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(m32c_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* m32r-tdep.c (m32r_gdbarch_init): Likewise.
	* m68hc11-tdep.c (breakpoint): Rename it to m68hc11_break_insn and
	change its type to constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(m68hc11_gdbarch_init): Don't use SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* m68k-tdep.c (break_insn): Rename it to m68k_break_insn and change
	its type to constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(m68k_gdbarch_init):  Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* m88k-tdep.c (break_insn): Rename it to m88k_break_insn and change
	its type to constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(m88k_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* mep-tdep.c (breakpoint): Rename it to mep_break_insn and change
	its type to constexpr.  Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(mep_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* microblaze-tdep.c (break_insn): Rename it to
	microblaze_break_insn and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(microblaze_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* mips-tdep.c (mips_gdbarch_init): Likewise.
	* mn10300-tdep.c (breakpoint): Rename it to mn10300_break_insn and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(mn10300_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* moxie-tdep.c (breakpoint): Rename it to moxie_break_insn and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(moxie_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* msp430-tdep.c (breakpoint): Rename it to msp430_break_insn
	and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(msp430_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* mt-tdep.c (mt_gdbarch_init): Likewise.
	* nds32-tdep.c (break_insn): Rename it to nds32_break_insn
	and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(nds32_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* nios2-tdep.c (nios2_gdbarch_init): Likewise.
	* rl78-tdep.c (breakpoint): Rename it to rl78_break_ins
	and change its type to rl78_break_insn.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(rl78_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* rs6000-tdep.c (big_breakpoint): Change its type to
	constexpr.
	(little_breakpoint): Likewise.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN.
	(rs6000_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* rx-tdep.c (breakpoint): Rename it to rx_break_insn and
	change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(rx_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* s390-linux-tdep.c (breakpoint): Rename it to s390_break_insn
	and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION
	(s390_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* score-tdep.c (score_gdbarch_init): Likewise.
	* sh-tdep.c (sh_gdbarch_init): Likewise.
	* sh64-tdep.c (sh64_gdbarch_init): Likewise.
	* sparc-tdep.c (break_insn): Rename it to sparc_break_insn
	and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(sparc32_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* spu-tdep.c (breakpoint): Rename it to spu_break_insn and change
	its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(spu_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* tic6x-tdep.c (tic6x_gdbarch_init): Likewise.
	* tilegx-tdep.c (breakpoint): Rename it to tilegx_break_insn
	and change its type to constexpr.  Don't use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(tilegx_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* v850-tdep.c (v850_gdbarch_init): Likewise.
	* vax-tdep.c (break_insn): Rename it to vax_break_insn and
	change its type to constexpr.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(vax_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* xstormy16-tdep.c (breakpoint): Rename it to
	xstormy16_break_insn and change its type to constexpr.
	Don't use GDBARCH_BREAKPOINT_MANIPULATION.
	(xstormy16_gdbarch_init): Don't use
	SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* xtensa-tdep.c (xtensa_gdbarch_init): Likewise.
 2016-11-03 14:35:14 +00:00
Yao Qi
833b7ab500 Determine the kind of single step breakpoint 
This patch adds a new gdbarch method breakpoint_kind_from_current_state
for single step breakpoint, and uses it in breakpoint_kind.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.c (default_breakpoint_kind_from_current_state):
	New function.
	* arch-utils.h (default_breakpoint_kind_from_current_state):
	Declare.
	* arm-tdep.c (arm_breakpoint_kind_from_current_state): New
	function.
	(arm_gdbarch_init): Call
	set_gdbarch_breakpoint_kind_from_current_state.
	* breakpoint.c (breakpoint_kind): Call
	gdbarch_breakpoint_kind_from_current_state for single step
	breakpoint.  Update comments.
	* gdbarch.sh (breakpoint_kind_from_current_state): New.
	* gdbarch.c, gdbarch.h: Regenerate.
 2016-11-03 14:35:14 +00:00
Yao Qi
22f13eb869 Add default_breakpoint_from_pc 
This patch adds the default implementation of gdbarch breakpoint_from_pc,
which is,

const gdb_byte *
default_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr,
                           int *lenptr)
{
  int kind = gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr);

  return gdbarch_sw_breakpoint_from_kind (gdbarch, kind, lenptr);
}

so gdbarch can only defines sw_breakpoint_from_kind and
breakpoint_kind_from_pc.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.c (default_breakpoint_from_pc): New function.
	* arch-utils.h (GDBARCH_BREAKPOINT_FROM_PC): Remove.
	(GDBARCH_BREAKPOINT_MANIPULATION): Don't use
	GDBARCH_BREAKPOINT_FROM_PC.
	(SET_GDBARCH_BREAKPOINT_MANIPULATION): Don't call
	set_gdbarch_breakpoint_from_pc.
	(default_breakpoint_from_pc): Remove declaration.
	* gdbarch.sh (breakpoint_from_pc): Add its default implementation.
	* gdbarch.c, gdbarch.h: Regenerate.
	* arm-tdep.c: Don't use GDBARCH_BREAKPOINT_FROM_PC.
	* arc-tdep.c, bfin-tdep.c, cris-tdep.c, iq2000-tdep.c: Likewise.
	* m32r-tdep.c, mips-tdep.c, mt-tdep.c: Likewise.
	* nios2-tdep.c, score-tdep.c, sh-tdep.c: Likewise.
	* sh64-tdep.c, tic6x-tdep.c, v850-tdep.c, xtensa-tdep.c: Likewise.
 2016-11-03 14:35:14 +00:00
Yao Qi
c0f4a997c2 Remove gdbarch_remote_breakpoint_from_pc 
This patch removes gdbarch method remote_breakpoint_from_pc, as it
is no longer used.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.c (default_remote_breakpoint_from_pc): Remove.
	* arch-utils.h (default_remote_breakpoint_from_pc): Remove.
	* arm-tdep.c (arm_remote_breakpoint_from_pc): Remove.
	(arm_gdbarch_init): Don't call
	set_gdbarch_remote_breakpoint_from_pc.
	* gdbarch.sh (remote_breakpoint_from_pc): Remove.
	* gdbarch.c, gdbarch.h: Regenerate.
	* mips-tdep.c (mips_remote_breakpoint_from_pc): Remove.
	(mips_gdbarch_init): Don't call
	set_gdbarch_remote_breakpoint_from_pc.
 2016-11-03 14:35:14 +00:00
Yao Qi
cd6c3b4ffc New gdbarch methods breakpoint_kind_from_pc and sw_breakpoint_from_kind 
This patch adds two gdbarch methods breakpoint_kind_from_pc and
sw_breakpoint_from_kind, and uses target_info.placed_size as "kind"
of the breakpoint.  This patch updates the usages of
target_info.placed_size.

The "kind" of a breakpoint is determined by gdbarch rather than
target, so we have gdbarch method breakpoint_kind_from_pc, and we
should set target_info.placed_size out of each implementation of
target to_insert_breakpoint.  In this way, each target doesn't have
to set target_info.placed_size any more.

This patch also sets target_info.placed_address before
target_insert_breakpoint too, so that target to_insert_breakpoint
can use it, see record_full_insert_breakpoint.

Before we call target_insert_breakpoint, we set
target_info.placed_address and target_info.placed_size like this,

      CORE_ADDR addr = bl->target_info.reqstd_address;

      bl->target_info.placed_size = gdbarch_breakpoint_kind_from_pc (bl->gdbarch, &addr);
      bl->target_info.placed_address = addr;

      return target_insert_breakpoint (bl->gdbarch, &bl->target_info);

target_insert_breakpoint may fail, but it doesn't matter to the "kind"
and "placed_address" of a breakpoint.  They should be determined by
gdbarch.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.h (GDBARCH_BREAKPOINT_MANIPULATION): Define
	breakpoint_kind_from_pc and sw_breakpoint_from_kind.
	(GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN): Likewise.
	(SET_GDBARCH_BREAKPOINT_MANIPULATION): Call
	set_gdbarch_breakpoint_kind_from_pc and
	set_gdbarch_sw_breakpoint_from_kind.
	* arm-tdep.c: Add comments.
	* bfin-tdep.c: Likewise.
	* breakpoint.c (breakpoint_kind): New function.
	(insert_bp_location): Set target_info.placed_size and
	target_info.placed_address.
	(bkpt_insert_location): Likewise.
	* cris-tdep.c: Add comments.
	* gdbarch.sh (breakpoint_kind_from_pc): New.
	(sw_breakpoint_from_kind): New.
	* gdbarch.c, gdbarch.h: Regenerated.
	* ia64-tdep.c (ia64_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.
	(ia64_memory_remove_breakpoint): Don't assert
	bp_tgt->placed_size.
	(ia64_breakpoint_kind_from_pc): New function.
	(ia64_gdbarch_init): Install ia64_breakpoint_kind_from_pc.
	* m32r-tdep.c (m32r_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.
	* mem-break.c (default_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.  Call gdbarch_sw_breakpoint_from_kind.
	(default_memory_remove_breakpoint): Call
	gdbarch_sw_breakpoint_from_kind.
	(memory_validate_breakpoint): Don't check bp_tgt->placed_size.
	* mips-tdep.c: Add comments.
	* mt-tdep.c: Likewise.
	* nios2-tdep.c: Likewise.
	* record-full.c (record_full_insert_breakpoint): Don't call
	gdbarch_breakpoint_from_pc.  Don't set bp_tgt->placed_address
	and bp_tgt->placed_size.
	* remote.c (remote_insert_breakpoint): Don't call
	gdbarch_remote_breakpoint_from_pc.  Use bp_tgt->placed_size.
	Don't set bp_tgt->placed_address and bp_tgt->placed_size.
	(remote_insert_hw_breakpoint): Likewise.
	* score-tdep.c: Likewise.
	* sh-tdep.c: Likewise.
	* tic6x-tdep.c: Likewise.
	* v850-tdep.c: Likewise.
	* xtensa-tdep.c: Likewise.
 2016-11-03 14:35:13 +00:00
Yao Qi
d19280adb5 Split breakpoint_from_pc to breakpoint_kind_from_pc and sw_breakpoint_from_kind 
We convert each ARCH_breakpoint_from_pc to ARCH_breakpoint_kind_from_pc
and ARCH_sw_breakpoint_from_kind.  Note that gdbarch doesn't have methods
breakpoint_kind_from_pc and sw_breakpoint_from_kind so far.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.h (GDBARCH_BREAKPOINT_FROM_PC): New macro.
	(GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN): New macro.
	* arm-tdep.c (arm_breakpoint_from_pc): Remove.
	(arm_breakpoint_kind_from_pc): New function.
	(arm_sw_breakpoint_from_kind): New function.
	(arm_breakpoint_from_pc): Call arm_breakpoint_kind_from_pc
	and arm_sw_breakpoint_from_kind.
	Use GDBARCH_BREAKPOINT_FROM_PC.
	(arm_remote_breakpoint_from_pc): Call
	arm_breakpoint_kind_from_pc.
	(arm_gdbarch_init): Replace set_gdbarch_breakpoint_from_pc
	with SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* arc-tdep.c: Likewise.
	* bfin-tdep.c: Likewise.
	* cris-tdep.c: Likewise.
	* iq2000-tdep.c: Likewise.
	* m32r-tdep.c: Likewise.
	* mips-tdep.c: Likewise.
	* mt-tdep.c: Likewise.
	* nios2-tdep.c: Likewise.
	* rs6000-tdep.c: Likewise.
	* score-tdep.c: Likewise.
	* sh-tdep.c: Likewise.
	* sh64-tdep.c: Likewise.
	* tic6x-tdep.c: Likewise.
	* v850-tdep.c: Likewise.
	* xtensa-tdep.c: Likewise.
 2016-11-03 14:35:13 +00:00
Yao Qi
598cc9dc84 GDBARCH_BREAKPOINT_MANIPULATION and SET_GDBARCH_BREAKPOINT_MANIPULATION 
Many archs have only one kind of breakpoint, so their breakpoint_from_pc
implementations are quite similar.  This patch uses macro
GDBARCH_BREAKPOINT_MANIPULATION and SET_GDBARCH_BREAKPOINT_MANIPULATION
for breakpoint_from_pc, so that we can easily switch from
breakpoint_from_pc to breakpoint_kind_from_pc and sw_breakpoint_from_kind
later.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.h (GDBARCH_BREAKPOINT_MANIPULATION): New macro.
	(SET_GDBARCH_BREAKPOINT_MANIPULATION): New macro.
	aarch64-tdep.c (aarch64_breakpoint_from_pc): Remove.  Use
	GDBARCH_BREAKPOINT_MANIPULATION.
	(aarch64_gdbarch_init): Replace set_gdbarch_breakpoint_from_pc
	with SET_GDBARCH_BREAKPOINT_MANIPULATION.
	* alpha-tdep.c: Likewise.
	* avr-tdep.c: Likewise.
	* frv-tdep.c: Likewise.
	* ft32-tdep.c: Likewise.
	* h8300-tdep.c: Likewise.
	* hppa-tdep.c: Likewise.
	* i386-tdep.c: Likewise.
	* lm32-tdep.c: Likewise.
	* m32c-tdep.c: Likewise.
	* m68hc11-tdep.c: Likewise.
	* m68k-tdep.c: Likewise.
	* m88k-tdep.c: Likewise.
	* mep-tdep.c: Likewise.
	* microblaze-tdep.c: Likewise.
	* mn10300-tdep.c: Likewise.
	* moxie-tdep.c: Likewise.
	* msp430-tdep.c: Likewise.
	* rl78-tdep.c: Likewise.
	* rx-tdep.c: Likewise.
	* s390-linux-tdep.c: Likewise.
	* sparc-tdep.c: Likewise.
	* spu-tdep.c: Likewise.
	* tilegx-tdep.c: Likewise.
	* vax-tdep.c: Likewise.
	* xstormy16-tdep.c: Likewise.
 2016-11-03 14:35:13 +00:00
Ulrich Weigand
9b790ce722 Add gdbarch callback to provide formats for debug info float types 
At this point, all TYPE_CODE_FLT types carry their floating-point format,
except for those creating from reading DWARF or stabs debug info.  Those
will be addressed by this commit.

The main issue here is that we actually have to determine which floating-
point format to use.  Currently, we only have the type length as input
to this decision.  In the future, we may hopefully get --at least in
DWARF-- additional information to help disambiguate multiple different
formats of the same length.  For now, we can still look at the type name
as a hint.

This decision logic is encapsulated in a gdbarch callback to allow
platform-specific overrides.  The default implementation use the same
logic (compare type length against the various gdbarch_..._bit sizes)
that is currently implemented in floatformat_from_length.

With this commit, all platforms still use the default logic, so there
should be no actual change in behavior.  A follow-on commit will add
support for __float128 on Intel and Power.

Once dwarf2read.c and stabsread.c make use of the new callback to
determine floating-point formats, we're now sure every TYPE_CODE_FLT
type will always carry its format.  The commit therefore adds asserts
to verify_floatformat to ensure new code will continue to always
provide formats, and removes the code in floatformat_from_type that
used to handle types with a NULL TYPE_FLOATFORMAT.

gdb/ChangeLog:

	* gdbarch.sh (floatformat_for_type): New gdbarch callback.
	* gdbarch.h, gdbarch.c: Re-generate.
	* arch-utils.h (default_floatformat_for_type): New prototype.
	* arch-utils.c (default_floatformat_for_type): New function.

	* doublest.c (floatformat_from_length): Remove.
	(floatformat_from_type): Assume TYPE_FLOATFORMAT is non-NULL.
	* gdbtypes.c (verify_floatformat): Require non-NULL format.

	* dwarf2read.c (dwarf2_init_float_type): New function.
	(read_base_type): Use it.
	* stabsread.c (dbx_init_float_type): New function.
	(read_sun_floating_type): Use it.
	(read_range_type): Likewise.

Signed-off-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
 2016-09-06 17:31:53 +02:00
Yao Qi
7eb895307f Skip unwritable frames in command "finish" 
Nowadays, GDB can't insert breakpoint on the return address of the
exception handler on ARM M-profile, because the address is a magic
one 0xfffffff9,

 (gdb) bt
 #0  CT32B1_IRQHandler () at ../src/timer.c:67
 #1  <signal handler called>
 #2  main () at ../src/timer.c:127

(gdb) info frame
Stack level 0, frame at 0x200ffa8:
 pc = 0x4ec in CT32B1_IRQHandler (../src/timer.c:67); saved pc = 0xfffffff9
 called by frame at 0x200ffc8
 source language c.
 Arglist at 0x200ffa0, args:
 Locals at 0x200ffa0, Previous frame's sp is 0x200ffa8
 Saved registers:
  r7 at 0x200ffa0, lr at 0x200ffa4

(gdb) x/x 0xfffffff9
0xfffffff9:     Cannot access memory at address 0xfffffff9

(gdb) finish
Run till exit from #0  CT32B1_IRQHandler () at ../src/timer.c:67
Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?)

Warning:
Cannot insert hardware breakpoint 0.
Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.

Command aborted.

even some debug probe can't set hardware breakpoint on the magic
address too,

(gdb) hbreak *0xfffffff9
Hardware assisted breakpoint 2 at 0xfffffff9
(gdb) c
Continuing.
Ed:15: Target error from Set break/watch: Et:96: Pseudo-address (0xFFFFFFxx) for EXC_RETURN is invalid (GDB error?)

Warning:
Cannot insert hardware breakpoint 2.
Could not insert hardware breakpoints:
You may have requested too many hardware breakpoints/watchpoints.

Command aborted.

The problem described above is quite similar to PR 8841, in which GDB
can't set breakpoint on signal trampoline, which is mapped to a read-only
page by kernel.  The rationale of this patch is to skip "unwritable"
frames when looking for caller frames in command "finish", and a new
gdbarch method code_of_frame_writable is added.  This patch fixes
the problem on ARM cortex-m target, but it can be used to fix
PR 8841 too.

gdb:

2016-05-10  Yao Qi  <yao.qi@arm.com>

	* arch-utils.c (default_code_of_frame_writable): New function.
	* arch-utils.h (default_code_of_frame_writable): Declare.
	* arm-tdep.c (arm_code_of_frame_writable): New function.
	(arm_gdbarch_init): Install gdbarch method
	code_of_frame_writable if the target is M-profile.
	* frame.c (skip_unwritable_frames): New function.
	* frame.h (skip_unwritable_frames): Declare.
	* gdbarch.sh (code_of_frame_writable): New.
	* gdbarch.c, gdbarch.h: Re-generated.
	* infcmd.c (finish_command): Call skip_unwritable_frames.
 2016-05-23 17:32:56 +01:00
Marcin Kościelnicki
5f034a78b9 gdb: Add guess_tracepoint_registers hook to gdbarch. 
When we're looking at a tracefile trace frame where registers are not
available, and the tracepoint has only one location, we supply
the location's address as the PC register.  However, this only works
if PC is not a pseudo register, and individual architectures may want
to guess more registers.  Add a gdbarch hook that will handle that.

gdb/ChangeLog:

	* arch-utils.c (default_guess_tracepoint_registers): New function.
	* arch-utils.h (default_guess_tracepoint_registers): New prototype.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh: Add guess_tracepoint_registers hook.
	* tracefile.c (tracefile_fetch_registers): Use the new gdbarch hook.
 2016-02-18 17:21:22 +01:00
Joel Brobecker
618f726fcb GDB copyright headers update after running GDB's copyright.py script. 
gdb/ChangeLog:

        Update year range in copyright notice of all files.
 2016-01-01 08:43:22 +04:00
Pierre Langlois
6b940e6a06 Remove isize output argument from fast_tracepoint_valid_at 
This patch removes the isize output argument from the
fast_tracepoint_valid_at gdbarch hook.  It was used to return the size
of the instruction that needs to be replaced when installing a fast
tracepoint.  Instead of getting this value from the
fast_tracepoint_valid_at hook, we can call the gdb_insn_length function.

If we do not do this, then architectures which do not have a restriction
on where to install the fast tracepoint will send uninitialized memory
off to GDBserver.  See remote_download_tracepoint:

~~~
int isize;

if (gdbarch_fast_tracepoint_valid_at (target_gdbarch (),
				      tpaddr, &isize, NULL))
  xsnprintf (buf + strlen (buf), BUF_SIZE - strlen (buf), ":F%x",
	     isize);
~~~

The default implementation of fast_tracepoint_valid_at will not set
isize resulting in uninitialized memory being sent.  Later on, GDBserver
could use this information to compute a jump offset.

gdb/ChangeLog:

	* arch-utils.c (default_fast_tracepoint_valid_at): Remove unused
	isize argument.
	* arch-utils.h (default_fast_tracepoint_valid_at): Likewise.
	* breakpoint.c (check_fast_tracepoint_sals): Adjust call to
	gdbarch_fast_tracepoint_valid_at.
	* gdbarch.sh (fast_tracepoint_valid_at): Remove isize argument.
	* gdbarch.h: Regenerate.
	* gdbarch.c: Regenerate.
	* i386-tdep.c (i386_fast_tracepoint_valid_at): Remove isize
	argument.  Do not set it.
	* remote.c (remote_download_tracepoint): Adjust call to
	gdbarch_fast_tracepoint_valid_at.  Call gdb_insn_length to get
	the instruction length.
 2015-07-30 18:05:00 +01:00
Simon Marchi
3374165f51 gdbarch: add addressable_memory_unit_size method 
Add a new gdbarch method to get the length of an addressable memory unit
for a given architecture. The default implementation returns 1.

gdb/ChangeLog:

	* arch-utils.h (default_addressable_memory_unit_size): New.
	* arch-utils.c (default_addressable_memory_unit_size): New.
	* gdbarch.sh (addressable_memory_unit_size): New.
	* gdbarch.h: Re-generate.
	* gdbarch.c: Re-generate.
 2015-06-12 16:51:51 -04:00
Jan Kratochvil
7f36105668 compile: Use also inferior munmap 
Currently inferior memory is allocated by inferior mmap() but it is never
deallocated; despite the injected objfile incl. its symbols is freed.  This was
intentional so that one can do for example:
inferior:
	char *str = "foo";
GDB:
	(gdb) compile code str = "bar";

I believe later patches will be needed to introduce full control over keeping
vs. discarding the injected module as being discussed in:
	compile: objfiles lifetime UI
	https://sourceware.org/ml/gdb/2015-04/msg00051.html
	Message-ID: <20150429135735.GA16974@host1.jankratochvil.net>
	https://sourceware.org/ml/gdb/2015-05/msg00007.html

As decided by Phil it is better not to leak inferior pages as users can
workaround the issue above for example by:
	(gdb) compile code str = strdup ("bar");

I have checked that in fact gdb/doc/ (written by Phil) already expects the
injected code will be unmapped so that does not need to be changed:
	compile code int ff = 5; p = &ff;
	In this example, @code{p} would point to @code{ff} when the
	@code{compile} command is executing the source code provided to it.
	However, as variables in the (example) program persist with their
	assigned values, the variable @code{p} would point to an invalid
	location when the command exists.

gdb/ChangeLog
2015-04-28  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* arch-utils.c (default_infcall_munmap): New.
	* arch-utils.h (default_infcall_munmap): New declaration.
	* compile/compile-object-load.c (struct munmap_list, munmap_list_add)
	(munmap_list_free, munmap_listp_free_cleanup): New.
	(struct setup_sections_data): Add field munmap_list_headp.
	(setup_sections): Call munmap_list_add.
	(compile_object_load): New variable munmap_list_head, initialize
	setup_sections_data.munmap_list_headp, return munmap_list_head.
	* compile/compile-object-load.h (struct munmap_list): New declaration.
	(struct compile_module): Add field munmap_list_head.
	(munmap_list_free): New declaration.
	* compile/compile-object-run.c (struct do_module_cleanup): Add field
	munmap_list_head.
	(do_module_cleanup): Call munmap_list_free.
	(compile_object_run): Pass munmap_list_head to do_module_cleanup.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh (infcall_munmap): New.
	* linux-tdep.c (linux_infcall_munmap): New.
	(linux_init_abi): Install it.

gdb/testsuite/ChangeLog
2015-04-28  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.compile/compile.exp (keep jit in memory): Rename to ...
	(do not keep jit in memory): ... this.
	(expect 5): Change it to ...
	(expect no 5): ... this.
 2015-06-03 21:26:04 +02:00
Martin Galvan
c9cf6e20c6 Rename in_function_epilogue_p to stack_frame_destroyed_p 
We concluded that gdbarch_in_function_epilogue_p is misnamed, since it
returns true if the given PC is one instruction after the one that
destroyed the stack (which isn't necessarily inside an epilogue),
therefore it should be renamed to stack_frame_destroyed_p.

I also took the liberty of renaming the arch-specific implementations to
*_stack_frame_destroyed_p as well for consistency.

gdb:

2015-05-26  Martin Galvan  <martin.galvan@tallertechnologies.com>

	* amd64-tdep.c: Replace in_function_epilogue_p with
	stack_frame_destroyed_p throughout.
	* arch-utils.c: Ditto.
	* arch-utils.h: Ditto.
	* arm-tdep.c: Ditto.
	* breakpoint.c: Ditto.
	* gdbarch.sh: Ditto.
	* hppa-tdep.c: Ditto.
	* i386-tdep.c: Ditto.
	* mips-tdep.c: Ditto.
	* nios2-tdep.c: Ditto.
	* rs6000-tdep.c: Ditto.
	* s390-linux-tdep.c: Ditto.
	* score-tdep.c: Ditto.
	* sh-tdep.c: Ditto.
	* sparc-tdep.c: Ditto.
	* sparc-tdep.h: Ditto.
	* sparc64-tdep.c: Ditto.
	* spu-tdep.c: Ditto.
	* tic6x-tdep.c: Ditto.
	* tilegx-tdep.c: Ditto.
	* xstormy16-tdep.c: Ditto.
	* gdbarch.c, gdbarch.h: Re-generated.
 2015-05-26 12:07:59 +01:00
Joel Brobecker
32d0add0a6 Update year range in copyright notice of all files owned by the GDB project. 
gdb/ChangeLog:

        Update year range in copyright notice of all files.
 2015-01-01 13:32:14 +04:00
Tom Tromey
ac04f72bb4 add gnu_triplet_regexp gdbarch method 
gdb has to inform libcc1.so of the target being used, so that the
correct compiler can be invoked.  The compiler is invoked using the
GNU configury triplet prefix, e.g., "x86_64-unknown-linux-gnu-gcc".

In order for this to work we need to map the gdbarch to the GNU
configury triplet arch.  In most cases these are identical; however,
the x86 family poses some problems, as the BFD arch names are quite
different from the GNU triplet names.  So, we introduce a new gdbarch
method for this.  A regular expression is used because there are
various valid values for the arch prefix in the triplet.

This patch also updates the osabi code to associate a regular
expression with the OS ABI.  I have only added a concrete value for
Linux.  Note that the "-gnu" part is optional, at least on Fedora it
is omitted from the installed GCC executable's name.

gdb/ChangeLog
2014-12-12  Tom Tromey  <tromey@redhat.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	* osabi.h (osabi_triplet_regexp): Declare.
	* osabi.c (struct osabi_names): New.
	(gdb_osabi_names): Change type to struct osabi_names.  Update
	values.
	(gdbarch_osabi_name): Update.
	(osabi_triplet_regexp): New function.
	(osabi_from_tdesc_string, _initialize_gdb_osabi): Update.
	* i386-tdep.c (i386_gnu_triplet_regexp): New method.
	(i386_elf_init_abi, i386_go32_init_abi, i386_gdbarch_init): Call
	set_gdbarch_gnu_triplet_regexp.
	* gdbarch.sh (gnu_triplet_regexp): New method.
	* gdbarch.c, gdbarch.h: Rebuild.
	* arch-utils.h (default_gnu_triplet_regexp): Declare.
	* arch-utils.c (default_gnu_triplet_regexp): New function.
 2014-12-12 22:26:11 +01:00
Jan Kratochvil
f208eee0f3 add infcall_mmap and gcc_target_options gdbarch methods 
The compiler needed two new gdbarch methods.

The infcall_mmap method allocates memory in the inferior.
This is used when inserting the object code.

The gcc_target_options method computes some arch-specific gcc options
to pass to the compiler.  This is used to ensure that gcc generates
object code for the correct architecture.

gdb/ChangeLog
2014-12-12  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* arch-utils.c (default_infcall_mmap)
	(default_gcc_target_options): New functions.
	* arch-utils.h (GDB_MMAP_PROT_READ, GDB_MMAP_PROT_WRITE)
	(GDB_MMAP_PROT_EXEC): Define.
	(default_infcall_mmap, default_gcc_target_options): Declare.
	* gdbarch.h: Rebuild.
	* gdbarch.c: Rebuild.
	* gdbarch.sh (infcall_mmap, gcc_target_options): New methods.
 2014-12-12 22:25:37 +01:00
Maciej W. Rozycki
3e29f34a4e MIPS: Keep the ISA bit in compressed code addresses 
1. Background information

The MIPS architecture, as originally designed and implemented in
mid-1980s has a uniform instruction word size that is 4 bytes, naturally
aligned.  As such all MIPS instructions are located at addresses that
have their bits #1 and #0 set to zeroes, and any attempt to execute an
instruction from an address that has any of the two bits set to one
causes an address error exception.  This may for example happen when a
jump-register instruction is executed whose register value used as the
jump target has any of these bits set.

Then in mid 1990s LSI sought a way to improve code density for their
TinyRISC family of MIPS cores and invented an alternatively encoded
instruction set in a joint effort with MIPS Technologies (then a
subsidiary of SGI).  The new instruction set has been named the MIPS16
ASE (Application-Specific Extension) and uses a variable instruction
word size, which is 2 bytes (as the name of the ASE suggests) for most,
but there are a couple of exceptions that take 4 bytes, and then most of
the 2-byte instructions can be treated with a 2-byte extension prefix to
expand the range of the immediate operands used.

As a result instructions are no longer 4-byte aligned, instead they are
aligned to a multiple of 2.  That left the bit #0 still unused for code
references, be it for the standard MIPS (i.e. as originally invented) or
for the MIPS16 instruction set, and based on that observation a clever
trick was invented that on one hand allowed the processor to be
seamlessly switched between the two instruction sets at any time at the
run time while on the other avoided the introduction of any special
control register to do that.

So it is the bit #0 of the instruction address that was chosen as the
selector and named the ISA bit.  Any instruction executed at an even
address is interpreted as a standard MIPS instruction (the address still
has to have its bit #1 clear), any instruction executed at an odd
address is interpreted as a MIPS16 instruction.

To switch between modes ordinary jump instructions are used, such as
used for function calls and returns, specifically the bit #0 of the
source register used in jump-register instructions selects the execution
(ISA) mode for the following piece of code to be interpreted in.
Additionally new jump-immediate instructions were added that flipped the
ISA bit to select the opposite mode upon execution.  They were
considered necessary to avoid the need to make register jumps in all
cases as the original jump-immediate instructions provided no way to
change the bit #0 at all.

This was all important for cases where standard MIPS and MIPS16 code had
to be mixed, either for compatibility with the existing binary code base
or to access resources not reachable from MIPS16 code (the MIPS16
instruction set only provides access to general-purpose registers, and
not for example floating-point unit registers or privileged coprocessor
0 registers) -- pieces of code in the opposite mode can be executed as
ordinary subroutine calls.

A similar approach has been more recently adopted for the MIPS16
replacement instruction set defined as the so called microMIPS ASE.
This is another instruction set encoding introduced to the MIPS
architecture.  Just like the MIPS16 ASE, the microMIPS instruction set
uses a variable-length encoding, where each instruction takes a multiple
of 2 bytes.  The ISA bit has been reused and for microMIPS-capable
processors selects between the standard MIPS and the microMIPS mode
instead.

2. Statement of the problem

To put it shortly, MIPS16 and microMIPS code pointers used by GDB are
different to these observed at the run time.  This results in the same
expressions being evaluated producing different results in GDB and in
the program being debugged.  Obviously it's the results obtained at the
run time that are correct (they define how the program behaves) and
therefore by definition the results obtained in GDB are incorrect.

A bit longer description will record that obviously at the run time the
ISA bit has to be set correctly (refer to background information above
if unsure why so) or the program will not run as expected.  This is
recorded in all the executable file structures used at the run time: the
dynamic symbol table (but not always the static one!), the GOT, and
obviously in all the addresses embedded in code or data of the program
itself, calculated by applying the appropriate relocations at the static
link time.

While a program is being processed by GDB, the ISA bit is stripped off
from any code addresses, presumably to make them the same as the
respective raw memory byte address used by the processor to access the
instruction in the instruction fetch access cycle.  This stripping is
actually performed outside GDB proper, in BFD, specifically
_bfd_mips_elf_symbol_processing (elfxx-mips.c, see the piece of code at
the very bottom of that function, starting with an: "If this is an
odd-valued function symbol, assume it's a MIPS16 or microMIPS one."
comment).

This function is also responsible for symbol table dumps made by
`objdump' too, so you'll never see the ISA bit reported there by that
tool, you need to use `readelf'.

This is however unlike what is ever done at the run time, the ISA bit
once present is never stripped off, for example a cast like this:

(short *) main

will not strip the ISA bit off and if the resulting pointer is intended
to be used to access instructions as data, for example for software
instruction decoding (like for fault recovery or emulation in a signal
handler) or for self-modifying code then the bit still has to be
stripped off by an explicit AND operation.

This is probably best illustrated with a simple real program example.
Let's consider the following simple program:

$ cat foobar.c
int __attribute__ ((mips16)) foo (void)
{
  return 1;
}

int __attribute__ ((mips16)) bar (void)
{
  return 2;
}

int __attribute__ ((nomips16)) foo32 (void)
{
  return 3;
}

int (*foo32p) (void) = foo32;
int (*foop) (void) = foo;
int fooi = (int) foo;

int
main (void)
{
  return foop ();
}
$

This is plain C with no odd tricks, except from the instruction mode
attributes.  They are not necessary to trigger this problem, I just put
them here so that the program can be contained in a single source file
and to make it obvious which function is MIPS16 code and which is not.

Let's try it with Linux, so that everyone can repeat this experiment:

$ mips-linux-gnu-gcc -mips16 -g -O2 -o foobar foobar.c
$

Let's have a look at some interesting symbols:

$ mips-linux-gnu-readelf -s foobar | egrep 'table|foo|bar'
Symbol table '.dynsym' contains 7 entries:
Symbol table '.symtab' contains 95 entries:
    55: 00000000     0 FILE    LOCAL  DEFAULT  ABS foobar.c
    66: 0040068c     4 FUNC    GLOBAL DEFAULT [MIPS16]    12 bar
    68: 00410848     4 OBJECT  GLOBAL DEFAULT   21 foo32p
    70: 00410844     4 OBJECT  GLOBAL DEFAULT   21 foop
    78: 00400684     8 FUNC    GLOBAL DEFAULT   12 foo32
    80: 00400680     4 FUNC    GLOBAL DEFAULT [MIPS16]    12 foo
    88: 00410840     4 OBJECT  GLOBAL DEFAULT   21 fooi
$

Hmm, no sight of the ISA bit, but notice how foo and bar (but not
foo32!) have been marked as MIPS16 functions (ELF symbol structure's
`st_other' field is used for that).

So let's try to run and poke at this program with GDB.  I'll be using a
native system for simplicity (I'll be using ellipses here and there to
remove unrelated clutter):

$ ./foobar
$ echo $?
1
$

So far, so good.

$ gdb ./foobar
[...]
(gdb) break main
Breakpoint 1 at 0x400490: file foobar.c, line 23.
(gdb) run
Starting program: .../foobar

Breakpoint 1, main () at foobar.c:23
23        return foop ();
(gdb)

Yay, it worked!  OK, so let's poke at it:

(gdb) print main
$1 = {int (void)} 0x400490 <main>
(gdb) print foo32
$2 = {int (void)} 0x400684 <foo32>
(gdb) print foo32p
$3 = (int (*)(void)) 0x400684 <foo32>
(gdb) print bar
$4 = {int (void)} 0x40068c <bar>
(gdb) print foo
$5 = {int (void)} 0x400680 <foo>
(gdb) print foop
$6 = (int (*)(void)) 0x400681 <foo>
(gdb)

A-ha!  Here's the difference and finally the ISA bit!

(gdb) print /x fooi
$7 = 0x400681
(gdb) p/x $pc
p/x $pc
$8 = 0x400491
(gdb)

And here as well...

(gdb) advance foo
foo () at foobar.c:4
4       }
(gdb) disassemble
Dump of assembler code for function foo:
   0x00400680 <+0>:     jr      ra
   0x00400682 <+2>:     li      v0,1
End of assembler dump.
(gdb) finish
Run till exit from #0  foo () at foobar.c:4
main () at foobar.c:24
24      }
Value returned is $9 = 1
(gdb) continue
Continuing.
[Inferior 1 (process 14103) exited with code 01]
(gdb)

So let's be a bit inquisitive...

(gdb) run
Starting program: .../foobar

Breakpoint 1, main () at foobar.c:23
23        return foop ();
(gdb)

Actually we do not like to run foo here at all.  Let's run bar instead!

(gdb) set foop = bar
(gdb) print foop
$10 = (int (*)(void)) 0x40068c <bar>
(gdb)

Hmm, no ISA bit.  Is it going to work?

(gdb) advance bar
bar () at foobar.c:9
9       }
(gdb) p/x $pc
$11 = 0x40068c
(gdb) disassemble
Dump of assembler code for function bar:
=> 0x0040068c <+0>:     jr      ra
   0x0040068e <+2>:     li      v0,2
End of assembler dump.
(gdb) finish
Run till exit from #0  bar () at foobar.c:9

Program received signal SIGILL, Illegal instruction.
bar () at foobar.c:9
9       }
(gdb)

Oops!

(gdb) p/x $pc
$12 = 0x40068c
(gdb)

We're still there!

(gdb) continue
Continuing.

Program terminated with signal SIGILL, Illegal instruction.
The program no longer exists.
(gdb)

So let's try something else:

(gdb) run
Starting program: .../foobar

Breakpoint 1, main () at foobar.c:23
23        return foop ();
(gdb) set foop = foo
(gdb) advance foo
foo () at foobar.c:4
4       }
(gdb) disassemble
Dump of assembler code for function foo:
=> 0x00400680 <+0>:     jr      ra
   0x00400682 <+2>:     li      v0,1
End of assembler dump.
(gdb) finish
Run till exit from #0  foo () at foobar.c:4

Program received signal SIGILL, Illegal instruction.
foo () at foobar.c:4
4       }
(gdb) continue
Continuing.

Program terminated with signal SIGILL, Illegal instruction.
The program no longer exists.
(gdb)

The same problem!

(gdb) run
Starting program:
/net/build2-lucid-cs/scratch/macro/mips-linux-fsf-gcc/isa-bit/foobar

Breakpoint 1, main () at foobar.c:23
23        return foop ();
(gdb) set foop = foo32
(gdb) advance foo32
foo32 () at foobar.c:14
14      }
(gdb) disassemble
Dump of assembler code for function foo32:
=> 0x00400684 <+0>:     jr      ra
   0x00400688 <+4>:     li      v0,3
End of assembler dump.
(gdb) finish
Run till exit from #0  foo32 () at foobar.c:14
main () at foobar.c:24
24      }
Value returned is $14 = 3
(gdb) continue
Continuing.
[Inferior 1 (process 14113) exited with code 03]
(gdb)

That did work though, so it's the ISA bit only!

(gdb) quit

Enough!

That's the tip of the iceberg only though.  So let's rebuild the
executable with some dynamic symbols:

$ mips-linux-gnu-gcc -mips16 -Wl,--export-dynamic -g -O2 -o foobar-dyn foobar.c
$ mips-linux-gnu-readelf -s foobar-dyn | egrep 'table|foo|bar'
Symbol table '.dynsym' contains 32 entries:
     6: 004009cd     4 FUNC    GLOBAL DEFAULT   12 bar
     8: 00410b88     4 OBJECT  GLOBAL DEFAULT   21 foo32p
     9: 00410b84     4 OBJECT  GLOBAL DEFAULT   21 foop
    15: 004009c4     8 FUNC    GLOBAL DEFAULT   12 foo32
    17: 004009c1     4 FUNC    GLOBAL DEFAULT   12 foo
    25: 00410b80     4 OBJECT  GLOBAL DEFAULT   21 fooi
Symbol table '.symtab' contains 95 entries:
    55: 00000000     0 FILE    LOCAL  DEFAULT  ABS foobar.c
    69: 004009cd     4 FUNC    GLOBAL DEFAULT   12 bar
    71: 00410b88     4 OBJECT  GLOBAL DEFAULT   21 foo32p
    72: 00410b84     4 OBJECT  GLOBAL DEFAULT   21 foop
    79: 004009c4     8 FUNC    GLOBAL DEFAULT   12 foo32
    81: 004009c1     4 FUNC    GLOBAL DEFAULT   12 foo
    89: 00410b80     4 OBJECT  GLOBAL DEFAULT   21 fooi
$

OK, now the ISA bit is there for a change, but the MIPS16 `st_other'
attribute gone, hmm...  What does `objdump' do then:

$ mips-linux-gnu-objdump -Tt foobar-dyn | egrep 'SYMBOL|foo|bar'
foobar-dyn:     file format elf32-tradbigmips
SYMBOL TABLE:
00000000 l    df *ABS*  00000000              foobar.c
004009cc g     F .text  00000004              0xf0 bar
00410b88 g     O .data  00000004              foo32p
00410b84 g     O .data  00000004              foop
004009c4 g     F .text  00000008              foo32
004009c0 g     F .text  00000004              0xf0 foo
00410b80 g     O .data  00000004              fooi
DYNAMIC SYMBOL TABLE:
004009cc g    DF .text  00000004  Base        0xf0 bar
00410b88 g    DO .data  00000004  Base        foo32p
00410b84 g    DO .data  00000004  Base        foop
004009c4 g    DF .text  00000008  Base        foo32
004009c0 g    DF .text  00000004  Base        0xf0 foo
00410b80 g    DO .data  00000004  Base        fooi
$

Hmm, the attribute (0xf0, printed raw) is back, and the ISA bit gone
again.

Let's have a look at some DWARF-2 records GDB uses (I'll be stripping
off a lot here for brevity) -- debug info:

$ mips-linux-gnu-readelf -wi foobar
Contents of the .debug_info section:
[...]
  Compilation Unit @ offset 0x88:
   Length:        0xbb (32-bit)
   Version:       4
   Abbrev Offset: 62
   Pointer Size:  4
 <0><93>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <94>   DW_AT_producer    : (indirect string, offset: 0x19e): GNU C 4.8.0 20120513 (experimental) -meb -mips16 -march=mips32r2 -mhard-float -mllsc -mplt -mno-synci -mno-shared -mabi=32 -g -O2
    <98>   DW_AT_language    : 1        (ANSI C)
    <99>   DW_AT_name        : (indirect string, offset: 0x190): foobar.c
    <9d>   DW_AT_comp_dir    : (indirect string, offset: 0x225): [...]
    <a1>   DW_AT_ranges      : 0x0
    <a5>   DW_AT_low_pc      : 0x0
    <a9>   DW_AT_stmt_list   : 0x27
 <1><ad>: Abbrev Number: 2 (DW_TAG_subprogram)
    <ae>   DW_AT_external    : 1
    <ae>   DW_AT_name        : foo
    <b2>   DW_AT_decl_file   : 1
    <b3>   DW_AT_decl_line   : 1
    <b4>   DW_AT_prototyped  : 1
    <b4>   DW_AT_type        : <0xc2>
    <b8>   DW_AT_low_pc      : 0x400680
    <bc>   DW_AT_high_pc     : 0x400684
    <c0>   DW_AT_frame_base  : 1 byte block: 9c         (DW_OP_call_frame_cfa)
    <c2>   DW_AT_GNU_all_call_sites: 1
 <1><c2>: Abbrev Number: 3 (DW_TAG_base_type)
    <c3>   DW_AT_byte_size   : 4
    <c4>   DW_AT_encoding    : 5        (signed)
    <c5>   DW_AT_name        : int
 <1><c9>: Abbrev Number: 4 (DW_TAG_subprogram)
    <ca>   DW_AT_external    : 1
    <ca>   DW_AT_name        : (indirect string, offset: 0x18a): foo32
    <ce>   DW_AT_decl_file   : 1
    <cf>   DW_AT_decl_line   : 11
    <d0>   DW_AT_prototyped  : 1
    <d0>   DW_AT_type        : <0xc2>
    <d4>   DW_AT_low_pc      : 0x400684
    <d8>   DW_AT_high_pc     : 0x40068c
    <dc>   DW_AT_frame_base  : 1 byte block: 9c         (DW_OP_call_frame_cfa)
    <de>   DW_AT_GNU_all_call_sites: 1
 <1><de>: Abbrev Number: 2 (DW_TAG_subprogram)
    <df>   DW_AT_external    : 1
    <df>   DW_AT_name        : bar
    <e3>   DW_AT_decl_file   : 1
    <e4>   DW_AT_decl_line   : 6
    <e5>   DW_AT_prototyped  : 1
    <e5>   DW_AT_type        : <0xc2>
    <e9>   DW_AT_low_pc      : 0x40068c
    <ed>   DW_AT_high_pc     : 0x400690
    <f1>   DW_AT_frame_base  : 1 byte block: 9c         (DW_OP_call_frame_cfa)
    <f3>   DW_AT_GNU_all_call_sites: 1
 <1><f3>: Abbrev Number: 5 (DW_TAG_subprogram)
    <f4>   DW_AT_external    : 1
    <f4>   DW_AT_name        : (indirect string, offset: 0x199): main
    <f8>   DW_AT_decl_file   : 1
    <f9>   DW_AT_decl_line   : 21
    <fa>   DW_AT_prototyped  : 1
    <fa>   DW_AT_type        : <0xc2>
    <fe>   DW_AT_low_pc      : 0x400490
    <102>   DW_AT_high_pc     : 0x4004a4
    <106>   DW_AT_frame_base  : 1 byte block: 9c        (DW_OP_call_frame_cfa)
    <108>   DW_AT_GNU_all_tail_call_sites: 1
[...]
$

-- no sign of the ISA bit anywhere -- frame info:

$ mips-linux-gnu-readelf -wf foobar
[...]
Contents of the .debug_frame section:

00000000 0000000c ffffffff CIE
  Version:               1
  Augmentation:          ""
  Code alignment factor: 1
  Data alignment factor: -4
  Return address column: 31

  DW_CFA_def_cfa_register: r29
  DW_CFA_nop

00000010 0000000c 00000000 FDE cie=00000000 pc=00400680..00400684

00000020 0000000c 00000000 FDE cie=00000000 pc=00400684..0040068c

00000030 0000000c 00000000 FDE cie=00000000 pc=0040068c..00400690

00000040 00000018 00000000 FDE cie=00000000 pc=00400490..004004a4
  DW_CFA_advance_loc: 6 to 00400496
  DW_CFA_def_cfa_offset: 32
  DW_CFA_offset: r31 at cfa-4
  DW_CFA_advance_loc: 6 to 0040049c
  DW_CFA_restore: r31
  DW_CFA_def_cfa_offset: 0
  DW_CFA_nop
  DW_CFA_nop
  DW_CFA_nop
[...]
$

-- no sign of the ISA bit anywhere -- range info (GDB doesn't use arange):

$ mips-linux-gnu-readelf -wR foobar
Contents of the .debug_ranges section:

    Offset   Begin    End
    00000000 00400680 00400690
    00000000 00400490 004004a4
    00000000 <End of list>

$

-- no sign of the ISA bit anywhere -- line info:

$ mips-linux-gnu-readelf -wl foobar
Raw dump of debug contents of section .debug_line:
[...]
  Offset:                      0x27
  Length:                      78
  DWARF Version:               2
  Prologue Length:             31
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  1
  Line Base:                   -5
  Line Range:                  14
  Opcode Base:                 13

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 args
  Opcode 3 has 1 args
  Opcode 4 has 1 args
  Opcode 5 has 1 args
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 args
  Opcode 10 has 0 args
  Opcode 11 has 0 args
  Opcode 12 has 1 args

 The Directory Table is empty.

 The File Name Table:
  Entry Dir     Time    Size    Name
  1     0       0       0       foobar.c

 Line Number Statements:
  Extended opcode 2: set Address to 0x400681
  Special opcode 6: advance Address by 0 to 0x400681 and Line by 1 to 2
  Special opcode 7: advance Address by 0 to 0x400681 and Line by 2 to 4
  Special opcode 55: advance Address by 3 to 0x400684 and Line by 8 to 12
  Special opcode 7: advance Address by 0 to 0x400684 and Line by 2 to 14
  Advance Line by -7 to 7
  Special opcode 131: advance Address by 9 to 0x40068d and Line by 0 to 7
  Special opcode 7: advance Address by 0 to 0x40068d and Line by 2 to 9
  Advance PC by 3 to 0x400690
  Extended opcode 1: End of Sequence

  Extended opcode 2: set Address to 0x400491
  Advance Line by 21 to 22
  Copy
  Special opcode 6: advance Address by 0 to 0x400491 and Line by 1 to 23
  Special opcode 60: advance Address by 4 to 0x400495 and Line by -1 to 22
  Special opcode 34: advance Address by 2 to 0x400497 and Line by 1 to 23
  Special opcode 62: advance Address by 4 to 0x40049b and Line by 1 to 24
  Special opcode 32: advance Address by 2 to 0x40049d and Line by -1 to 23
  Special opcode 6: advance Address by 0 to 0x40049d and Line by 1 to 24
  Advance PC by 7 to 0x4004a4
  Extended opcode 1: End of Sequence
[...]

-- a-ha, the ISA bit is there!  However it's not always right for some
reason, I don't have a small test case to show it, but here's an excerpt
from MIPS16 libc, a prologue of a function:

00019630 <__libc_init_first>:
   19630:       e8a0            jrc     ra
   19632:       6500            nop

00019634 <_init>:
   19634:       f000 6a11       li      v0,17
   19638:       f7d8 0b08       la      v1,15e00 <_DYNAMIC+0x15c54>
   1963c:       f400 3240       sll     v0,16
   19640:       e269            addu    v0,v1
   19642:       659a            move    gp,v0
   19644:       64f6            save    48,ra,s0-s1
   19646:       671c            move    s0,gp
   19648:       d204            sw      v0,16(sp)
   1964a:       f352 984c       lw      v0,-27828(s0)
   1964e:       6724            move    s1,a0

and the corresponding DWARF-2 line info:

 Line Number Statements:
  Extended opcode 2: set Address to 0x19631
  Advance Line by 44 to 45
  Copy
  Special opcode 8: advance Address by 0 to 0x19631 and Line by 3 to 48
  Special opcode 66: advance Address by 4 to 0x19635 and Line by 5 to 53
  Advance PC by constant 17 to 0x19646
  Special opcode 25: advance Address by 1 to 0x19647 and Line by 6 to 59
  Advance Line by -6 to 53
  Special opcode 33: advance Address by 2 to 0x19649 and Line by 0 to 53
  Special opcode 39: advance Address by 2 to 0x1964b and Line by 6 to 59
  Advance Line by -6 to 53
  Special opcode 61: advance Address by 4 to 0x1964f and Line by 0 to 53

-- see that "Advance PC by constant 17" there?  It clears the ISA bit,
however code at 0x19646 is not standard MIPS code at all.  For some
reason the constant is always 17, I've never seen DW_LNS_const_add_pc
used with any other value -- is that a binutils bug or what?

3. Solution:

I think we should retain the value of the ISA bit in code references,
that is effectively treat them as cookies as they indeed are (although
trivially calculated) rather than raw memory byte addresses.

In a perfect world both the static symbol table and the respective
DWARF-2 records should be fixed to include the ISA bit in all the cases.
I think however that this is infeasible.

All the uses of `_bfd_mips_elf_symbol_processing' can not necessarily be
tracked down.  This function is used by `elf_slurp_symbol_table' that in
turn is used by `bfd_canonicalize_symtab' and
`bfd_canonicalize_dynamic_symtab', which are public interfaces.

Similarly DWARF-2 records are used outside GDB, one notable if a bit
questionable is the exception unwinder (libgcc/unwind-dw2.c) -- I have
identified at least bits in `execute_cfa_program' and
`uw_frame_state_for', both around the calls to `_Unwind_IsSignalFrame',
that would need an update as they effectively flip the ISA bit freely;
see also the comment about MASK_RETURN_ADDR in gcc/config/mips/mips.h.
But there may be more places.  Any change in how DWARF-2 records are
produced would require an update there and would cause compatibility
problems with libgcc.a binaries already distributed; given that this is
a static library a complex change involving function renames would
likely be required.

I propose therefore to accept the existing inconsistencies and deal with
them entirely within GDB.  I have figured out that the ISA bit lost in
various places can still be recovered as long as we have symbol
information -- that'll have the `st_other' attribute correctly set to
one of standard MIPS/MIPS16/microMIPS encoding.

Here's the resulting change.  It adds a couple of new `gdbarch' hooks,
one to update symbol information with the ISA bit lost in
`_bfd_mips_elf_symbol_processing', and two other ones to adjust DWARF-2
records as they're processed.  The ISA bit is set in each address
handled according to information retrieved from the symbol table for the
symbol spanning the address if any; limits are adjusted based on the
address they point to related to the respective base address.
Additionally minimal symbol information has to be adjusted accordingly
in its gdbarch hook.

With these changes in place some complications with ISA bit juggling in
the PC that never fully worked can be removed from the MIPS backend.
Conversely, the generic dynamic linker event special breakpoint symbol
handler has to be updated to call the minimal symbol gdbarch hook to
record that the symbol is a MIPS16 or microMIPS address if applicable or
the breakpoint will be set at the wrong address and either fail to work
or cause SIGTRAPs (this is because the symbol is handled early on and
bypasses regular symbol processing).

4. Results obtained

The change fixes the example above -- to repeat only the crucial steps:

(gdb) break main
Breakpoint 1 at 0x400491: file foobar.c, line 23.
(gdb) run
Starting program: .../foobar

Breakpoint 1, main () at foobar.c:23
23        return foop ();
(gdb) print foo
$1 = {int (void)} 0x400681 <foo>
(gdb) set foop = bar
(gdb) advance bar
bar () at foobar.c:9
9       }
(gdb) disassemble
Dump of assembler code for function bar:
=> 0x0040068d <+0>:     jr      ra
   0x0040068f <+2>:     li      v0,2
End of assembler dump.
(gdb) finish
Run till exit from #0  bar () at foobar.c:9
main () at foobar.c:24
24      }
Value returned is $2 = 2
(gdb) continue
Continuing.
[Inferior 1 (process 14128) exited with code 02]
(gdb)

-- excellent!

The change removes about 90 failures per MIPS16 multilib in mips-sde-elf
testing too, results for MIPS16 are now similar to that for standard
MIPS; microMIPS results are a bit worse because of host-I/O problems in
QEMU used instead of MIPSsim for microMIPS testing only:

                === gdb Summary ===

# of expected passes            14299
# of unexpected failures        187
# of expected failures          56
# of known failures             58
# of unresolved testcases       11
# of untested testcases         52
# of unsupported tests          174

MIPS16:

                === gdb Summary ===

# of expected passes            14298
# of unexpected failures        187
# of unexpected successes       2
# of expected failures          54
# of known failures             58
# of unresolved testcases       12
# of untested testcases         52
# of unsupported tests          174

microMIPS:

                === gdb Summary ===

# of expected passes            14149
# of unexpected failures        201
# of unexpected successes       2
# of expected failures          54
# of known failures             58
# of unresolved testcases       7
# of untested testcases         53
# of unsupported tests          175

2014-12-12  Maciej W. Rozycki  <macro@codesourcery.com>
            Maciej W. Rozycki  <macro@mips.com>
            Pedro Alves  <pedro@codesourcery.com>

	gdb/
	* gdbarch.sh (elf_make_msymbol_special): Change type to `F',
	remove `predefault' and `invalid_p' initializers.
	(make_symbol_special): New architecture method.
	(adjust_dwarf2_addr, adjust_dwarf2_line): Likewise.
	(objfile, symbol): New declarations.
	* arch-utils.h (default_elf_make_msymbol_special): Remove
	prototype.
	(default_make_symbol_special): New prototype.
	(default_adjust_dwarf2_addr): Likewise.
	(default_adjust_dwarf2_line): Likewise.
	* mips-tdep.h (mips_unmake_compact_addr): New prototype.
	* arch-utils.c (default_elf_make_msymbol_special): Remove
	function.
	(default_make_symbol_special): New function.
	(default_adjust_dwarf2_addr): Likewise.
	(default_adjust_dwarf2_line): Likewise.
	* dwarf2-frame.c (decode_frame_entry_1): Call
	`gdbarch_adjust_dwarf2_addr'.
	* dwarf2loc.c (dwarf2_find_location_expression): Likewise.
	* dwarf2read.c (create_addrmap_from_index): Likewise.
	(process_psymtab_comp_unit_reader): Likewise.
	(add_partial_symbol): Likewise.
	(add_partial_subprogram): Likewise.
	(process_full_comp_unit): Likewise.
	(read_file_scope): Likewise.
	(read_func_scope): Likewise.  Call `gdbarch_make_symbol_special'.
	(read_lexical_block_scope): Call `gdbarch_adjust_dwarf2_addr'.
	(read_call_site_scope): Likewise.
	(dwarf2_ranges_read): Likewise.
	(dwarf2_record_block_ranges): Likewise.
	(read_attribute_value): Likewise.
	(dwarf_decode_lines_1): Call `gdbarch_adjust_dwarf2_line'.
	(new_symbol_full): Call `gdbarch_adjust_dwarf2_addr'.
	* elfread.c (elf_symtab_read): Don't call
	`gdbarch_elf_make_msymbol_special' if unset.
	* mips-linux-tdep.c (micromips_linux_sigframe_validate): Strip
	the ISA bit from the PC.
	* mips-tdep.c (mips_unmake_compact_addr): New function.
	(mips_elf_make_msymbol_special): Set the ISA bit in the symbol's
	address appropriately.
	(mips_make_symbol_special): New function.
	(mips_pc_is_mips): Set the ISA bit before symbol lookup.
	(mips_pc_is_mips16): Likewise.
	(mips_pc_is_micromips): Likewise.
	(mips_pc_isa): Likewise.
	(mips_adjust_dwarf2_addr): New function.
	(mips_adjust_dwarf2_line): Likewise.
	(mips_read_pc, mips_unwind_pc): Keep the ISA bit.
	(mips_addr_bits_remove): Likewise.
	(mips_skip_trampoline_code): Likewise.
	(mips_write_pc): Don't set the ISA bit.
	(mips_eabi_push_dummy_call): Likewise.
	(mips_o64_push_dummy_call): Likewise.
	(mips_gdbarch_init): Install `mips_make_symbol_special',
	`mips_adjust_dwarf2_addr' and `mips_adjust_dwarf2_line' gdbarch
	handlers.
	* solib.c (gdb_bfd_lookup_symbol_from_symtab): Get
	target-specific symbol address adjustments.
	* gdbarch.h: Regenerate.
	* gdbarch.c: Regenerate.

2014-12-12  Maciej W. Rozycki  <macro@codesourcery.com>

	gdb/testsuite/
	* gdb.base/func-ptrs.c: New file.
	* gdb.base/func-ptrs.exp: New file.
 2014-12-12 13:49:06 +00:00
Pedro Alves
ae9bb220ca add a default method for gdbarch_skip_permanent_breakpoint 
breakpoint.c uses gdbarch_breakpoint_from_pc to determine whether a
breakpoint location points at a permanent breakpoint:

 static int
 bp_loc_is_permanent (struct bp_location *loc)
 {
 ...
   addr = loc->address;
   bpoint = gdbarch_breakpoint_from_pc (loc->gdbarch, &addr, &len);
 ...
  if (target_read_memory (loc->address, target_mem, len) == 0
      && memcmp (target_mem, bpoint, len) == 0)
    retval = 1;
 ...

So I think we should default the gdbarch_skip_permanent_breakpoint
hook to advancing the PC by the length of the breakpoint instruction,
as determined by gdbarch_breakpoint_from_pc.  I believe that simple
implementation does the right thing for most architectures.  If
there's an oddball architecture where that doesn't work, then it
should override the hook, just like it should be overriding the hook
if there was no default anyway.

The only two implementation of skip_permanent_breakpoint are
i386_skip_permanent_breakpoint, for x86, and
hppa_skip_permanent_breakpoint, for PA-RISC/HP-UX

The x86 implementation is trivial, and can clearly be replaced by the
new default.

I don't know about the HP-UX one though, I know almost nothing about
PA.  It may well be advancing the PC ends up being equivalent.
Otherwise, it must be that "jump $pc_after_bp" doesn't work either...

Tested on x86_64 Fedora 20 native and gdbserver.

gdb/
2014-11-12  Pedro Alves  <palves@redhat.com>

	* arch-utils.c (default_skip_permanent_breakpoint): New function.
	* arch-utils.h (default_skip_permanent_breakpoint): New
	declaration.
	* gdbarch.sh (skip_permanent_breakpoint): Now an 'f' function.
	Install default_skip_permanent_breakpoint as default method.
	* i386-tdep.c (i386_skip_permanent_breakpoint): Delete function.
	(i386_gdbarch_init): Don't install it.
	* infrun.c (resume): Assume there's always a
	gdbarch_skip_permanent_breakpoint implementation.
	* gdbarch.h, gdbarch.c: Regenerate.
 2014-11-12 10:32:53 +00:00
Pedro Alves
3437254d7b Split vDSO range lookup to a gdbarch hook 
We have a case in solib-svr4.c where we could reuse symfile-mem.c's
vDSO range lookup.  Since symfile-mem.c is not present in all
configurations solib-svr4.c is, move that lookup to a gdbarch hook.

This has the minor (good) side effect that we stop even trying the
target_auxv_search lookup against targets that don't have a concept of
a vDSO, in case symfile-mem.c happens to be linked in the build
(--enable-targets=all).

Tested on x86_64 Fedora 20.

gdb/
2014-10-10  Pedro Alves  <palves@redhat.com>

	* arch-utils.c (default_vsyscall_range): New function.
	* arch-utils.h (default_vsyscall_range): New declaration.
	* gdbarch.sh (vsyscall_range): New hook.
	* gdbarch.h, gdbarch.c: Regenerate.
	* linux-tdep.c (linux_vsyscall_range): New function.
	(linux_init_abi): Install linux_vsyscall_range as
	vsyscall_range gdbarch hook.
	* memrange.c (address_in_mem_range): New function.
	* memrange.h (address_in_mem_range): New declaration.
	* symfile-mem.c (find_vdso_size): Delete function.
	(add_vsyscall_page): Use gdbarch_vsyscall_range.
 2014-10-10 15:57:13 +01:00
Markus Metzger
c2170eeffa gdbarch: add instruction predicate methods 
Add new methods to gdbarch for analyzing the instruction at a given address.
Implement those methods for i386 and amd64 architectures.

This is needed by "record btrace" to detect function calls in the
execution trace.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* amd64-tdep.c (amd64_classify_insn_at, amd64_insn_is_call)
	(amd64_insn_is_ret, amd64_insn_is_jump, amd64_jmp_p): New.
	(amd64_init_abi): Add insn_is_call, insn_is_ret, and insn_is_jump
	to gdbarch.
	* i386-tdep.c (i386_insn_is_call, i386_insn_is_ret)
	(i386_insn_is_jump, i386_jmp_p): New.
	(i386_gdbarch_init): Add insn_is_call, insn_is_ret, and
	insn_is_jump to gdbarch.
	* gdbarch.sh (insn_is_call, insn_is_ret, insn_is_jump): New.
	* gdbarch.h: Regenerated.
	* gdbarch.c: Regenerated.
	* arch-utils.h (default_insn_is_call, default_insn_is_ret)
	(default_insn_is_jump): New.
	* arch-utils.c (default_insn_is_call, default_insn_is_ret)
	(default_insn_is_jump): New.
 2014-01-16 12:45:11 +01:00
Joel Brobecker
ecd75fc8ee Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
Joel Brobecker
28e7fd6234 Update years in copyright notice for the GDB files. 
Two modifications:
  1. The addition of 2013 to the copyright year range for every file;
  2. The use of a single year range, instead of potentially multiple
     year ranges, as approved by the FSF.
 2013-01-01 06:33:28 +00:00
Yao Qi
ccce17b060 gdb/ 
* dwarf2loc.c (entry_values_debug): Add 'unsigned'.
	(_initialize_dwarf2loc): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* dwarf2loc.h: Update the declaration of 'entry_values_debug'.
	* dwarf2read.c (dwarf2_die_debug): Add 'unsigned'.
	(_initialize_dwarf2_read): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* darwin-nat.c (dwarwin_debug_flag): Add 'unsigned'.
	(_initialize_darwin_inferior): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* frame.c (frame_debug): Add 'unsigned'.
	(_intialize_frame): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* frame.h: Update the declaration of 'frame_debug'.
	* gdbtypes.c (overload_debug): Add 'unsigned'.
	(_initialize_gdbtypes): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* inferior.h: Update declaration of 'debug_infrun'.
	* infrun.c (debug_infrun): Add 'unsigned'.
	(_initialize_infrun): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* jit.c (jit_debug): Add 'unsigned'.
	(_initialize_jit): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* linux-nat.c (debug_linux_nat): Add 'unsigned'.
	(_initialize_linux_nat): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* linux-thread-db.c (libthread_db_debug): Add 'unsigned'.
	(_initialize_thread_db): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* machoread.c (mach_o_debug_level): Add 'unsigned'.
	(_initialize_machoread): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* mi/mi-cmd-var.c: Update the declaration of 'varobjdebug'.
	* microblaze-tdep.c (microblaze_debug_flag): Add 'unsigned'.
	(_initialize_microblaze_tdep): Call add_setshow_zuinteger_cmd
	intead of add_setshow_zinteger_cmd.
	* mips-tdep.c (mips_debug): Add 'unsigned'.
	(_initialize_mips_tdep): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* monitor.c (monitor_debug): Add 'unsigned'.
	(_initialize_remote_monitors): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* observer.c (observer_debug): Add 'unsigned'.
	(_initialize_observer): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* parse.c (expressiondebug): Add 'unsigned'.
	(_initialize_parse): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* record.c (record_debug): Add 'unsigned'.
	(_initialize_record): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* record.h: Update the declaration of 'record_debug'.
	* stap-probe.c (stap_expression_debug): Add 'unsigned'.
	(_initialize_stap_probe): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* serial.c (global_serial_debug_p): Add 'unsigned'.
	(_initialize_serial): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* solib-dsbt.c (solib_dsbt_debug): Add 'unsigned'.
	(_initialize_dsbt_solib): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* solib-frv.c (solib_frv_debug): Add 'unsigned'.
	(_initialize_frv_solib): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* target.c (targetdebug): Add 'unsigned'.
	(initialize_targets): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* valops.c (overload_debug): Add 'unsigned'.
	* varobj.c (varobjdebug): Add 'unsigned'.
	(_initialize_varobj): Call add_setshow_zuinteger_cmd instead of
	add_setshow_zinteger_cmd.
	* xtensa-tdep.c (xtensa_debug_level): Add 'unsigned'.
	(_initialize_xtensa_tdep): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.

	* arch-utils.h: Remove the declaration of 'gdbarch_debug'.
	* gdbarch.sh (gdbarch_debug): Add 'unsigned'.
	(extern void _initialize_gdbarch): Call add_setshow_zuinteger_cmd
	instead of add_setshow_zinteger_cmd.
	* gdbarch.c, gdbarch.h: Re-generated.
 2012-08-02 09:36:40 +00:00
Yao Qi
18648a3749 gdb/ 
* arch-utils.c (default_return_in_first_hidden_param_p): New.
	* arch-utils.h: Declare.
	* gdbarch.sh: Add return_in_first_hidden_param_p.
	* gdbarch.c, gdbarch.h: Regenerated.
	* infcall.c (call_function_by_hand): Call
	gdbarch_return_in_first_hidden_param_p instead of
	language_pass_by_reference.

	* m68k-tdep.c (m68k_return_in_first_hidden_param_p): New.
	(m68k_gdbarch_init): Install m68k_return_in_first_hidden_param_p.
	* sh-tdep.c (sh_return_in_first_hidden_param_p): New.
	(sh_gdbarch_init): Install sh_return_in_first_hidden_param_p.
	* tic6x-tdep.c (tic6x_push_dummy_call): Remove local variable
	`cplus_return_struct_by_reference'.
	(tic6x_return_value): Handle language cplusplus.
	(tic6x_return_in_first_hidden_param_p): New.
	(tic6x_gdbarch_init): Install tic6x_return_in_first_hidden_param_p.
 2012-06-08 14:24:57 +00:00
Pedro Alves
1f8cf22072 2012-06-04 Pedro Alves <palves@redhat.com> 
* arch-utils.c (default_gdb_signal_from_target): Delete.
	* arch-utils.h (default_gdb_signal_from_target): Delete.
	* corelow.c (core_open) <signal mapping>: Extended comment.  Check
	gdbarch_gdb_signal_from_target_p.
	* gdbarch.sh (gdb_signal_from_target): Make it an M method (with
	predicate).
	* gdbarch.h: Regenerate.
	* gdbarch.c: Regenerate.
 2012-06-04 16:23:57 +00:00
Pedro Alves
22203bbfb7 2012-05-24 Pedro Alves <palves@redhat.com> 
PR gdb/7205

	* arch-utils.c (default_gdb_signal_to_host): Rename to ...
	(default_gdb_signal_to_target): ... this.  Add comment.
	(default_gdb_signal_from_host): Rename to ...
	(default_gdb_signal_from_target): ... this.  Add comment.
	* arch-utils.h (default_gdb_signal_to_host): Rename to ...
	(default_gdb_signal_to_target): ... this.
	(default_gdb_signal_from_host): Rename to ...
	(default_gdb_signal_from_target): ... this.
	* corelow.c (core_open): Adjust to naming change.  Replace comment.
	* gdbarch.sh (gdb_signal_from_host): Rename to ...
	(gdb_signal_from_target): ... this.  Adjust to
	default_gdb_signal_from_host naming change.  Extend comment.
	(gdb_signal_to_host): Rename to ...
	(gdb_signal_to_target): ... this.  Adjust to
	default_gdb_signal_to_host naming change.
	* gdbarch.h, gdbarch.c: Renegerate.
 2012-05-24 17:03:28 +00:00
Pedro Alves
2ea286498f gdb/ 
2012-05-24  Pedro Alves  <palves@redhat.com>

	PR gdb/7205

	Replace target_signal with gdb_signal throughout.

gdb/gdbserver/
2012-05-24  Pedro Alves  <palves@redhat.com>

	PR gdb/7205

	Replace target_signal with gdb_signal throughout.

include/gdb/
2012-05-24  Pedro Alves  <palves@redhat.com>

	PR gdb/7205

	Replace target_signal with gdb_signal throughout.

sim/common/
2012-05-24  Pedro Alves  <palves@redhat.com>

	PR gdb/7205

	Replace target_signal with gdb_signal throughout.
 2012-05-24 16:39:15 +00:00
Pedro Alves
a79378d451 2012-05-23 Pedro Alves <palves@redhat.com> 
* arch-utils.h (default_target_signal_to_host): Delete.
	* arch-utils.c (default_target_signal_to_host): Delete.
	* gdbarch.sh (target_signal_to_host): Remove.
	* gdbarch.h, gdbarch.c: Regenerate.
 2012-05-23 11:34:56 +00:00
Pedro Alves
ed01b82c02 2012-03-01 Pedro Alves <palves@redhat.com> 
* common/signals.c (default_target_signal_to_host)
	(default_target_signal_from_host): Move ...
	* arch-utils.c: ... here.
	* arch-utils.h (default_target_signal_to_host)
	(default_target_signal_from_host): Declare.

	* common/signals.c (target_signal_from_command): Move ...
	* infrun.c: ... here.
	* inferior.h (target_signal_from_command): Declare.
	* target.h (target_signal_from_command)
	(default_target_signal_from_host, default_target_signal_to_host):
	Delete declarations.

	* common/signals.c (_initialize_signals): Delete.
 2012-03-01 21:11:23 +00:00
Doug Evans
2c02bd7290 * blockframe.c (find_pc_partial_function_gnu_ifunc): Change type of 
"name" parameter to const char ** from char **.  All callers updated.
	(find_pc_partial_function): Ditto.
	(cache_pc_function_name): Change type to const char * from char *.
	* symtab.h ((find_pc_partial_function_gnu_ifunc): Update.
	(find_pc_partial_function): Update.
	* alpha-tdep.h (struct gdbarch_tdep, member pc_in_sigtramp): Change
	type of "name" parameter to const char * from char *.
	All uses updated.
	* arch-utils.c (generic_in_solib_return_trampoline): Change
	type of "name" parameter to const char * from char *.
	* arch-utils.h (generic_in_solib_return_trampoline): Update.
	* frv-linux-tdep.c (frv_linux_pc_in_sigtramp): Change
	type of "name" parameter to const char * from char *.
	* gdbarch.sh (in_solib_return_trampoline): Ditto.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* hppa-hpux-tdep.c (hppa_hpux_in_solib_return_trampoline): Update.
	* rs6000-tdep.c (rs6000_in_solib_return_trampoline): Update.
	* m32r-linux-tdep.c (m32r_linux_pc_in_sigtramp): Change
	type of "name" parameter to const char * from char *.
	* skip.c (skip_function_pc): Ditto.
	* sparc-sol2-tdep.c (sparc_sol2_pc_in_sigtramp): Ditto.
	* sparc-tdep.h (sparc_sol2_pc_in_sigtramp): Update.
	* sparc64fbsd-tdep.c (sparc64fbsd_pc_in_sigtramp): Ditto.
	* sparc64nbsd-tdep.c (sparc64nbsd_pc_in_sigtramp): Ditto.
	* sparc64obsd-tdep.c (sparc64obsd_pc_in_sigtramp): Ditto.
	* sparcnbsd-tdep.c (sparc32nbsd_pc_in_sigtramp): Ditto.
	* sparcobsd-tdep.c (sparc32obsd_pc_in_sigtramp): Ditto.
	* nbsd-tdep.c (nbsd_pc_in_sigtramp): Similary for "func_name".
	* nbsd-tdep.h (nbsd_pc_in_sigtramp): Update.
 2012-02-02 20:19:17 +00:00
Joel Brobecker
0b30217134 Copyright year update in most files of the GDB Project. 
gdb/ChangeLog:

        Copyright year update in most files of the GDB Project.
 2012-01-04 08:17:56 +00:00
Stan Shebs
6710bf39b7 Add return address collection for tracepoints. 
* tracepoint.c (encode_actions_1): Add case for $_ret.
	(validate_actionline): Check for $_ret.
	(trace_dump_actions): Ditto.
	* ax-gdb.h (gen_trace_for_return_address): Declare.
	* ax-gdb.c: Include arch-utils.h.
	(gen_trace_for_return_address): New function.
	(agent_command): Add return address special case.
	* amd64-tdep.c: Include ax.h and ax-gdb.h.
	(amd64_gen_return_address): New function.
	(amd64_init_abi): Call it.
	* i386-tdep.c: Include ax.h and ax-gdb.h.
	(i386_gen_return_address): New function.
	(i386_init_abi): Call it.
	* arch-utils.h (default_gen_return_address): Declare.
	* arch-utils.c (default_gen_return_address): New function.
	* gdbarch.sh (gen_return_address): New method.
	* gdbarch.h, gdbarch.c: Regenerate.

	* gdb.texinfo (Tracepoint Action Lists): Document $_ret.

	* gdb.trace/collection.exp: Test collection of $_ret.
 2011-09-27 13:09:37 +00:00