mirror of
https://sourceware.org/git/binutils-gdb.git
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08106042d9
I built GDB for all targets on a x86-64/GNU-Linux system, and
then (accidentally) passed GDB a RISC-V binary, and asked GDB to "run"
the binary on the native target. I got this error:
(gdb) show architecture
The target architecture is set to "auto" (currently "i386").
(gdb) file /tmp/hello.rv32.exe
Reading symbols from /tmp/hello.rv32.exe...
(gdb) show architecture
The target architecture is set to "auto" (currently "riscv:rv32").
(gdb) run
Starting program: /tmp/hello.rv32.exe
../../src/gdb/i387-tdep.c:596: internal-error: i387_supply_fxsave: Assertion `tdep->st0_regnum >= I386_ST0_REGNUM' failed.
What's going on here is this; initially the architecture is i386, this
is based on the default architecture, which is set based on the native
target. After loading the RISC-V executable the architecture of the
current inferior is updated based on the architecture of the
executable.
When we "run", GDB does a fork & exec, with the inferior being
controlled through ptrace. GDB sees an initial stop from the inferior
as soon as the inferior comes to life. In response to this stop GDB
ends up calling save_stop_reason (linux-nat.c), which ends up trying
to read register from the inferior, to do this we end up calling
target_ops::fetch_registers, which, for the x86-64 native target,
calls amd64_linux_nat_target::fetch_registers.
After this I eventually end up in i387_supply_fxsave, different x86
based targets will end in different functions to fetch registers, but
it doesn't really matter which function we end up in, the problem is
this line, which is repeated in many places:
i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
The problem here is that the ARCH in this line comes from the current
inferior, which, as we discussed above, will be a RISC-V gdbarch, the
tdep field will actually be of type riscv_gdbarch_tdep, not
i386_gdbarch_tdep. After this cast we are relying on undefined
behaviour, in my case I happen to trigger an assert, but this might
not always be the case.
The thing I tried that exposed this problem was of course, trying to
start an executable of the wrong architecture on a native target. I
don't think that the correct solution for this problem is to detect,
at the point of cast, that the gdbarch_tdep object is of the wrong
type, but, I did wonder, is there a way that we could protect
ourselves from incorrectly casting the gdbarch_tdep object?
I think that there is something we can do here, and this commit is the
first step in that direction, though no actual check is added by this
commit.
This commit can be split into two parts:
(1) In gdbarch.h and arch-utils.c. In these files I have modified
gdbarch_tdep (the function) so that it now takes a template argument,
like this:
template<typename TDepType>
static inline TDepType *
gdbarch_tdep (struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep_1 (gdbarch);
return static_cast<TDepType *> (tdep);
}
After this change we are no better protected, but the cast is now
done within the gdbarch_tdep function rather than at the call sites,
this leads to the second, much larger change in this commit,
(2) Everywhere gdbarch_tdep is called, we make changes like this:
- i386_gdbarch_tdep *tdep = (i386_gdbarch_tdep *) gdbarch_tdep (arch);
+ i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (arch);
There should be no functional change after this commit.
In the next commit I will build on this change to add an assertion in
gdbarch_tdep that checks we are casting to the correct type.
1591 lines
42 KiB
C
1591 lines
42 KiB
C
/* Dynamic architecture support for GDB, the GNU debugger.
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Copyright (C) 1998-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
|
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it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "gdbcmd.h"
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#include "inferior.h" /* enum CALL_DUMMY_LOCATION et al. */
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#include "infrun.h"
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#include "regcache.h"
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#include "sim-regno.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "target-descriptions.h"
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#include "objfiles.h"
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#include "language.h"
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#include "symtab.h"
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#include "dummy-frame.h"
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#include "frame-unwind.h"
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#include "reggroups.h"
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#include "auxv.h"
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#include "observable.h"
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#include "gdbsupport/version.h"
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#include "floatformat.h"
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#include "dis-asm.h"
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bool
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default_displaced_step_hw_singlestep (struct gdbarch *gdbarch)
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{
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return !gdbarch_software_single_step_p (gdbarch);
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}
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CORE_ADDR
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displaced_step_at_entry_point (struct gdbarch *gdbarch)
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{
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CORE_ADDR addr;
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int bp_len;
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addr = entry_point_address ();
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/* Inferior calls also use the entry point as a breakpoint location.
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We don't want displaced stepping to interfere with those
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breakpoints, so leave space. */
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gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len);
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addr += bp_len * 2;
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return addr;
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}
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int
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legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum)
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{
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/* Only makes sense to supply raw registers. */
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gdb_assert (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch));
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/* NOTE: cagney/2002-05-13: The old code did it this way and it is
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suspected that some GDB/SIM combinations may rely on this
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behaviour. The default should be one2one_register_sim_regno
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(below). */
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if (gdbarch_register_name (gdbarch, regnum) != NULL
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&& gdbarch_register_name (gdbarch, regnum)[0] != '\0')
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return regnum;
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else
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return LEGACY_SIM_REGNO_IGNORE;
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||
}
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/* See arch-utils.h */
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std::string
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default_memtag_to_string (struct gdbarch *gdbarch, struct value *tag)
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{
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error (_("This architecture has no method to convert a memory tag to"
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" a string."));
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}
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/* See arch-utils.h */
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bool
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default_tagged_address_p (struct gdbarch *gdbarch, struct value *address)
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{
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/* By default, assume the address is untagged. */
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return false;
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}
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/* See arch-utils.h */
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bool
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default_memtag_matches_p (struct gdbarch *gdbarch, struct value *address)
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{
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/* By default, assume the tags match. */
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return true;
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}
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/* See arch-utils.h */
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bool
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default_set_memtags (struct gdbarch *gdbarch, struct value *address,
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size_t length, const gdb::byte_vector &tags,
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memtag_type tag_type)
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{
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/* By default, return true (successful); */
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return true;
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}
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/* See arch-utils.h */
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struct value *
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default_get_memtag (struct gdbarch *gdbarch, struct value *address,
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memtag_type tag_type)
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{
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/* By default, return no tag. */
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return nullptr;
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}
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CORE_ADDR
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generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
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{
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return 0;
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}
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CORE_ADDR
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generic_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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return 0;
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}
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int
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generic_in_solib_return_trampoline (struct gdbarch *gdbarch,
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CORE_ADDR pc, const char *name)
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{
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return 0;
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}
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int
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generic_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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return 0;
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}
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int
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default_code_of_frame_writable (struct gdbarch *gdbarch,
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struct frame_info *frame)
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{
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return 1;
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}
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/* Helper functions for gdbarch_inner_than */
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int
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core_addr_lessthan (CORE_ADDR lhs, CORE_ADDR rhs)
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{
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return (lhs < rhs);
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}
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int
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core_addr_greaterthan (CORE_ADDR lhs, CORE_ADDR rhs)
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{
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return (lhs > rhs);
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}
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/* Misc helper functions for targets. */
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CORE_ADDR
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core_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr)
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{
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return addr;
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}
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CORE_ADDR
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convert_from_func_ptr_addr_identity (struct gdbarch *gdbarch, CORE_ADDR addr,
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struct target_ops *targ)
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{
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return addr;
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}
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int
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no_op_reg_to_regnum (struct gdbarch *gdbarch, int reg)
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{
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return reg;
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}
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void
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default_coff_make_msymbol_special (int val, struct minimal_symbol *msym)
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{
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return;
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}
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/* See arch-utils.h. */
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void
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default_make_symbol_special (struct symbol *sym, struct objfile *objfile)
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{
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return;
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}
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/* See arch-utils.h. */
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CORE_ADDR
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default_adjust_dwarf2_addr (CORE_ADDR pc)
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{
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return pc;
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}
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/* See arch-utils.h. */
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CORE_ADDR
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default_adjust_dwarf2_line (CORE_ADDR addr, int rel)
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{
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return addr;
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}
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/* See arch-utils.h. */
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bool
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default_execute_dwarf_cfa_vendor_op (struct gdbarch *gdbarch, gdb_byte op,
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struct dwarf2_frame_state *fs)
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{
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return false;
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}
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int
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cannot_register_not (struct gdbarch *gdbarch, int regnum)
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{
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return 0;
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}
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/* Legacy version of target_virtual_frame_pointer(). Assumes that
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there is an gdbarch_deprecated_fp_regnum and that it is the same,
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cooked or raw. */
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void
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legacy_virtual_frame_pointer (struct gdbarch *gdbarch,
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CORE_ADDR pc,
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int *frame_regnum,
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LONGEST *frame_offset)
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{
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/* FIXME: cagney/2002-09-13: This code is used when identifying the
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frame pointer of the current PC. It is assuming that a single
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register and an offset can determine this. I think it should
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instead generate a byte code expression as that would work better
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with things like Dwarf2's CFI. */
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if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0
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&& gdbarch_deprecated_fp_regnum (gdbarch)
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< gdbarch_num_regs (gdbarch))
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*frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch);
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else if (gdbarch_sp_regnum (gdbarch) >= 0
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&& gdbarch_sp_regnum (gdbarch)
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< gdbarch_num_regs (gdbarch))
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*frame_regnum = gdbarch_sp_regnum (gdbarch);
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else
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/* Should this be an internal error? I guess so, it is reflecting
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an architectural limitation in the current design. */
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internal_error (__FILE__, __LINE__,
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_("No virtual frame pointer available"));
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*frame_offset = 0;
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}
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/* Return a floating-point format for a floating-point variable of
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length LEN in bits. If non-NULL, NAME is the name of its type.
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If no suitable type is found, return NULL. */
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const struct floatformat **
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default_floatformat_for_type (struct gdbarch *gdbarch,
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const char *name, int len)
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{
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const struct floatformat **format = NULL;
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/* Check if this is a bfloat16 type. It has the same size as the
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IEEE half float type, so we use the base type name to tell them
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apart. */
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if (name != nullptr && strcmp (name, "__bf16") == 0
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&& len == gdbarch_bfloat16_bit (gdbarch))
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format = gdbarch_bfloat16_format (gdbarch);
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else if (len == gdbarch_half_bit (gdbarch))
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format = gdbarch_half_format (gdbarch);
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else if (len == gdbarch_float_bit (gdbarch))
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format = gdbarch_float_format (gdbarch);
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else if (len == gdbarch_double_bit (gdbarch))
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format = gdbarch_double_format (gdbarch);
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else if (len == gdbarch_long_double_bit (gdbarch))
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format = gdbarch_long_double_format (gdbarch);
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/* On i386 the 'long double' type takes 96 bits,
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while the real number of used bits is only 80,
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both in processor and in memory.
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The code below accepts the real bit size. */
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else if (gdbarch_long_double_format (gdbarch) != NULL
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&& len == gdbarch_long_double_format (gdbarch)[0]->totalsize)
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format = gdbarch_long_double_format (gdbarch);
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return format;
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}
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int
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generic_convert_register_p (struct gdbarch *gdbarch, int regnum,
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struct type *type)
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{
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return 0;
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}
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int
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default_stabs_argument_has_addr (struct gdbarch *gdbarch, struct type *type)
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{
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return 0;
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}
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int
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generic_instruction_nullified (struct gdbarch *gdbarch,
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struct regcache *regcache)
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{
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return 0;
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}
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int
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default_remote_register_number (struct gdbarch *gdbarch,
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int regno)
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{
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return regno;
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}
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/* See arch-utils.h. */
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int
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default_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range)
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{
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return 0;
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}
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/* Functions to manipulate the endianness of the target. */
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static enum bfd_endian target_byte_order_user = BFD_ENDIAN_UNKNOWN;
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static const char endian_big[] = "big";
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static const char endian_little[] = "little";
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static const char endian_auto[] = "auto";
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static const char *const endian_enum[] =
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{
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endian_big,
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endian_little,
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endian_auto,
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NULL,
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};
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static const char *set_endian_string = endian_auto;
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enum bfd_endian
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selected_byte_order (void)
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{
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return target_byte_order_user;
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}
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/* Called by ``show endian''. */
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static void
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show_endian (struct ui_file *file, int from_tty, struct cmd_list_element *c,
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const char *value)
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{
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if (target_byte_order_user == BFD_ENDIAN_UNKNOWN)
|
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if (gdbarch_byte_order (get_current_arch ()) == BFD_ENDIAN_BIG)
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gdb_printf (file, _("The target endianness is set automatically "
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"(currently big endian).\n"));
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else
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gdb_printf (file, _("The target endianness is set automatically "
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"(currently little endian).\n"));
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else
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if (target_byte_order_user == BFD_ENDIAN_BIG)
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gdb_printf (file,
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_("The target is set to big endian.\n"));
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else
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gdb_printf (file,
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_("The target is set to little endian.\n"));
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}
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static void
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set_endian (const char *ignore_args, int from_tty, struct cmd_list_element *c)
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{
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struct gdbarch_info info;
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if (set_endian_string == endian_auto)
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{
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target_byte_order_user = BFD_ENDIAN_UNKNOWN;
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if (! gdbarch_update_p (info))
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internal_error (__FILE__, __LINE__,
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_("set_endian: architecture update failed"));
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}
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else if (set_endian_string == endian_little)
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{
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info.byte_order = BFD_ENDIAN_LITTLE;
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if (! gdbarch_update_p (info))
|
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gdb_printf (gdb_stderr,
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_("Little endian target not supported by GDB\n"));
|
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else
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target_byte_order_user = BFD_ENDIAN_LITTLE;
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}
|
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else if (set_endian_string == endian_big)
|
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{
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info.byte_order = BFD_ENDIAN_BIG;
|
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if (! gdbarch_update_p (info))
|
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gdb_printf (gdb_stderr,
|
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_("Big endian target not supported by GDB\n"));
|
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else
|
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target_byte_order_user = BFD_ENDIAN_BIG;
|
||
}
|
||
else
|
||
internal_error (__FILE__, __LINE__,
|
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_("set_endian: bad value"));
|
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|
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show_endian (gdb_stdout, from_tty, NULL, NULL);
|
||
}
|
||
|
||
/* Given SELECTED, a currently selected BFD architecture, and
|
||
TARGET_DESC, the current target description, return what
|
||
architecture to use.
|
||
|
||
SELECTED may be NULL, in which case we return the architecture
|
||
associated with TARGET_DESC. If SELECTED specifies a variant
|
||
of the architecture associated with TARGET_DESC, return the
|
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more specific of the two.
|
||
|
||
If SELECTED is a different architecture, but it is accepted as
|
||
compatible by the target, we can use the target architecture.
|
||
|
||
If SELECTED is obviously incompatible, warn the user. */
|
||
|
||
static const struct bfd_arch_info *
|
||
choose_architecture_for_target (const struct target_desc *target_desc,
|
||
const struct bfd_arch_info *selected)
|
||
{
|
||
const struct bfd_arch_info *from_target = tdesc_architecture (target_desc);
|
||
const struct bfd_arch_info *compat1, *compat2;
|
||
|
||
if (selected == NULL)
|
||
return from_target;
|
||
|
||
if (from_target == NULL)
|
||
return selected;
|
||
|
||
/* struct bfd_arch_info objects are singletons: that is, there's
|
||
supposed to be exactly one instance for a given machine. So you
|
||
can tell whether two are equivalent by comparing pointers. */
|
||
if (from_target == selected)
|
||
return selected;
|
||
|
||
/* BFD's 'A->compatible (A, B)' functions return zero if A and B are
|
||
incompatible. But if they are compatible, it returns the 'more
|
||
featureful' of the two arches. That is, if A can run code
|
||
written for B, but B can't run code written for A, then it'll
|
||
return A.
|
||
|
||
Some targets (e.g. MIPS as of 2006-12-04) don't fully
|
||
implement this, instead always returning NULL or the first
|
||
argument. We detect that case by checking both directions. */
|
||
|
||
compat1 = selected->compatible (selected, from_target);
|
||
compat2 = from_target->compatible (from_target, selected);
|
||
|
||
if (compat1 == NULL && compat2 == NULL)
|
||
{
|
||
/* BFD considers the architectures incompatible. Check our
|
||
target description whether it accepts SELECTED as compatible
|
||
anyway. */
|
||
if (tdesc_compatible_p (target_desc, selected))
|
||
return from_target;
|
||
|
||
warning (_("Selected architecture %s is not compatible "
|
||
"with reported target architecture %s"),
|
||
selected->printable_name, from_target->printable_name);
|
||
return selected;
|
||
}
|
||
|
||
if (compat1 == NULL)
|
||
return compat2;
|
||
if (compat2 == NULL)
|
||
return compat1;
|
||
if (compat1 == compat2)
|
||
return compat1;
|
||
|
||
/* If the two didn't match, but one of them was a default
|
||
architecture, assume the more specific one is correct. This
|
||
handles the case where an executable or target description just
|
||
says "mips", but the other knows which MIPS variant. */
|
||
if (compat1->the_default)
|
||
return compat2;
|
||
if (compat2->the_default)
|
||
return compat1;
|
||
|
||
/* We have no idea which one is better. This is a bug, but not
|
||
a critical problem; warn the user. */
|
||
warning (_("Selected architecture %s is ambiguous with "
|
||
"reported target architecture %s"),
|
||
selected->printable_name, from_target->printable_name);
|
||
return selected;
|
||
}
|
||
|
||
/* Functions to manipulate the architecture of the target. */
|
||
|
||
enum set_arch { set_arch_auto, set_arch_manual };
|
||
|
||
static const struct bfd_arch_info *target_architecture_user;
|
||
|
||
static const char *set_architecture_string;
|
||
|
||
const char *
|
||
selected_architecture_name (void)
|
||
{
|
||
if (target_architecture_user == NULL)
|
||
return NULL;
|
||
else
|
||
return set_architecture_string;
|
||
}
|
||
|
||
/* Called if the user enters ``show architecture'' without an
|
||
argument. */
|
||
|
||
static void
|
||
show_architecture (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
if (target_architecture_user == NULL)
|
||
gdb_printf (file, _("The target architecture is set to "
|
||
"\"auto\" (currently \"%s\").\n"),
|
||
gdbarch_bfd_arch_info (get_current_arch ())->printable_name);
|
||
else
|
||
gdb_printf (file, _("The target architecture is set to \"%s\".\n"),
|
||
set_architecture_string);
|
||
}
|
||
|
||
|
||
/* Called if the user enters ``set architecture'' with or without an
|
||
argument. */
|
||
|
||
static void
|
||
set_architecture (const char *ignore_args,
|
||
int from_tty, struct cmd_list_element *c)
|
||
{
|
||
struct gdbarch_info info;
|
||
|
||
if (strcmp (set_architecture_string, "auto") == 0)
|
||
{
|
||
target_architecture_user = NULL;
|
||
if (!gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("could not select an architecture automatically"));
|
||
}
|
||
else
|
||
{
|
||
info.bfd_arch_info = bfd_scan_arch (set_architecture_string);
|
||
if (info.bfd_arch_info == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("set_architecture: bfd_scan_arch failed"));
|
||
if (gdbarch_update_p (info))
|
||
target_architecture_user = info.bfd_arch_info;
|
||
else
|
||
gdb_printf (gdb_stderr,
|
||
_("Architecture `%s' not recognized.\n"),
|
||
set_architecture_string);
|
||
}
|
||
show_architecture (gdb_stdout, from_tty, NULL, NULL);
|
||
}
|
||
|
||
/* Try to select a global architecture that matches "info". Return
|
||
non-zero if the attempt succeeds. */
|
||
int
|
||
gdbarch_update_p (struct gdbarch_info info)
|
||
{
|
||
struct gdbarch *new_gdbarch;
|
||
|
||
/* Check for the current file. */
|
||
if (info.abfd == NULL)
|
||
info.abfd = current_program_space->exec_bfd ();
|
||
if (info.abfd == NULL)
|
||
info.abfd = core_bfd;
|
||
|
||
/* Check for the current target description. */
|
||
if (info.target_desc == NULL)
|
||
info.target_desc = target_current_description ();
|
||
|
||
new_gdbarch = gdbarch_find_by_info (info);
|
||
|
||
/* If there no architecture by that name, reject the request. */
|
||
if (new_gdbarch == NULL)
|
||
{
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_update_p: "
|
||
"Architecture not found\n");
|
||
return 0;
|
||
}
|
||
|
||
/* If it is the same old architecture, accept the request (but don't
|
||
swap anything). */
|
||
if (new_gdbarch == target_gdbarch ())
|
||
{
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_update_p: "
|
||
"Architecture %s (%s) unchanged\n",
|
||
host_address_to_string (new_gdbarch),
|
||
gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
|
||
return 1;
|
||
}
|
||
|
||
/* It's a new architecture, swap it in. */
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_update_p: "
|
||
"New architecture %s (%s) selected\n",
|
||
host_address_to_string (new_gdbarch),
|
||
gdbarch_bfd_arch_info (new_gdbarch)->printable_name);
|
||
set_target_gdbarch (new_gdbarch);
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Return the architecture for ABFD. If no suitable architecture
|
||
could be find, return NULL. */
|
||
|
||
struct gdbarch *
|
||
gdbarch_from_bfd (bfd *abfd)
|
||
{
|
||
struct gdbarch_info info;
|
||
|
||
info.abfd = abfd;
|
||
return gdbarch_find_by_info (info);
|
||
}
|
||
|
||
/* Set the dynamic target-system-dependent parameters (architecture,
|
||
byte-order) using information found in the BFD */
|
||
|
||
void
|
||
set_gdbarch_from_file (bfd *abfd)
|
||
{
|
||
struct gdbarch_info info;
|
||
struct gdbarch *gdbarch;
|
||
|
||
info.abfd = abfd;
|
||
info.target_desc = target_current_description ();
|
||
gdbarch = gdbarch_find_by_info (info);
|
||
|
||
if (gdbarch == NULL)
|
||
error (_("Architecture of file not recognized."));
|
||
set_target_gdbarch (gdbarch);
|
||
}
|
||
|
||
/* Initialize the current architecture. Update the ``set
|
||
architecture'' command so that it specifies a list of valid
|
||
architectures. */
|
||
|
||
#ifdef DEFAULT_BFD_ARCH
|
||
extern const bfd_arch_info_type DEFAULT_BFD_ARCH;
|
||
static const bfd_arch_info_type *default_bfd_arch = &DEFAULT_BFD_ARCH;
|
||
#else
|
||
static const bfd_arch_info_type *default_bfd_arch;
|
||
#endif
|
||
|
||
#ifdef DEFAULT_BFD_VEC
|
||
extern const bfd_target DEFAULT_BFD_VEC;
|
||
static const bfd_target *default_bfd_vec = &DEFAULT_BFD_VEC;
|
||
#else
|
||
static const bfd_target *default_bfd_vec;
|
||
#endif
|
||
|
||
static enum bfd_endian default_byte_order = BFD_ENDIAN_UNKNOWN;
|
||
|
||
/* Printable names of architectures. Used as the enum list of the
|
||
"set arch" command. */
|
||
static std::vector<const char *> arches;
|
||
|
||
void
|
||
initialize_current_architecture (void)
|
||
{
|
||
arches = gdbarch_printable_names ();
|
||
|
||
/* Find a default architecture. */
|
||
if (default_bfd_arch == NULL)
|
||
{
|
||
/* Choose the architecture by taking the first one
|
||
alphabetically. */
|
||
const char *chosen = arches[0];
|
||
|
||
for (const char *arch : arches)
|
||
{
|
||
if (strcmp (arch, chosen) < 0)
|
||
chosen = arch;
|
||
}
|
||
|
||
if (chosen == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: No arch"));
|
||
|
||
default_bfd_arch = bfd_scan_arch (chosen);
|
||
if (default_bfd_arch == NULL)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: Arch not found"));
|
||
}
|
||
|
||
gdbarch_info info;
|
||
info.bfd_arch_info = default_bfd_arch;
|
||
|
||
/* Take several guesses at a byte order. */
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& default_bfd_vec != NULL)
|
||
{
|
||
/* Extract BFD's default vector's byte order. */
|
||
switch (default_bfd_vec->byteorder)
|
||
{
|
||
case BFD_ENDIAN_BIG:
|
||
default_byte_order = BFD_ENDIAN_BIG;
|
||
break;
|
||
case BFD_ENDIAN_LITTLE:
|
||
default_byte_order = BFD_ENDIAN_LITTLE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN)
|
||
{
|
||
/* look for ``*el-*'' in the target name. */
|
||
const char *chp;
|
||
chp = strchr (target_name, '-');
|
||
if (chp != NULL
|
||
&& chp - 2 >= target_name
|
||
&& startswith (chp - 2, "el"))
|
||
default_byte_order = BFD_ENDIAN_LITTLE;
|
||
}
|
||
if (default_byte_order == BFD_ENDIAN_UNKNOWN)
|
||
{
|
||
/* Wire it to big-endian!!! */
|
||
default_byte_order = BFD_ENDIAN_BIG;
|
||
}
|
||
|
||
info.byte_order = default_byte_order;
|
||
info.byte_order_for_code = info.byte_order;
|
||
|
||
if (! gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("initialize_current_architecture: Selection of "
|
||
"initial architecture failed"));
|
||
|
||
/* Create the ``set architecture'' command appending ``auto'' to the
|
||
list of architectures. */
|
||
{
|
||
/* Append ``auto''. */
|
||
set_architecture_string = "auto";
|
||
arches.push_back (set_architecture_string);
|
||
arches.push_back (nullptr);
|
||
set_show_commands architecture_cmds
|
||
= add_setshow_enum_cmd ("architecture", class_support,
|
||
arches.data (), &set_architecture_string,
|
||
_("Set architecture of target."),
|
||
_("Show architecture of target."), NULL,
|
||
set_architecture, show_architecture,
|
||
&setlist, &showlist);
|
||
add_alias_cmd ("processor", architecture_cmds.set, class_support, 1,
|
||
&setlist);
|
||
}
|
||
}
|
||
|
||
/* Similar to init, but this time fill in the blanks. Information is
|
||
obtained from the global "set ..." options and explicitly
|
||
initialized INFO fields. */
|
||
|
||
void
|
||
gdbarch_info_fill (struct gdbarch_info *info)
|
||
{
|
||
/* "(gdb) set architecture ...". */
|
||
if (info->bfd_arch_info == NULL
|
||
&& target_architecture_user)
|
||
info->bfd_arch_info = target_architecture_user;
|
||
/* From the file. */
|
||
if (info->bfd_arch_info == NULL
|
||
&& info->abfd != NULL
|
||
&& bfd_get_arch (info->abfd) != bfd_arch_unknown
|
||
&& bfd_get_arch (info->abfd) != bfd_arch_obscure)
|
||
info->bfd_arch_info = bfd_get_arch_info (info->abfd);
|
||
/* From the target. */
|
||
if (info->target_desc != NULL)
|
||
info->bfd_arch_info = choose_architecture_for_target
|
||
(info->target_desc, info->bfd_arch_info);
|
||
/* From the default. */
|
||
if (info->bfd_arch_info == NULL)
|
||
info->bfd_arch_info = default_bfd_arch;
|
||
|
||
/* "(gdb) set byte-order ...". */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& target_byte_order_user != BFD_ENDIAN_UNKNOWN)
|
||
info->byte_order = target_byte_order_user;
|
||
/* From the INFO struct. */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN
|
||
&& info->abfd != NULL)
|
||
info->byte_order = (bfd_big_endian (info->abfd) ? BFD_ENDIAN_BIG
|
||
: bfd_little_endian (info->abfd) ? BFD_ENDIAN_LITTLE
|
||
: BFD_ENDIAN_UNKNOWN);
|
||
/* From the default. */
|
||
if (info->byte_order == BFD_ENDIAN_UNKNOWN)
|
||
info->byte_order = default_byte_order;
|
||
info->byte_order_for_code = info->byte_order;
|
||
/* Wire the default to the last selected byte order. */
|
||
default_byte_order = info->byte_order;
|
||
|
||
/* "(gdb) set osabi ...". Handled by gdbarch_lookup_osabi. */
|
||
/* From the manual override, or from file. */
|
||
if (info->osabi == GDB_OSABI_UNKNOWN)
|
||
info->osabi = gdbarch_lookup_osabi (info->abfd);
|
||
/* From the target. */
|
||
|
||
if (info->osabi == GDB_OSABI_UNKNOWN && info->target_desc != NULL)
|
||
info->osabi = tdesc_osabi (info->target_desc);
|
||
/* From the configured default. */
|
||
#ifdef GDB_OSABI_DEFAULT
|
||
if (info->osabi == GDB_OSABI_UNKNOWN)
|
||
info->osabi = GDB_OSABI_DEFAULT;
|
||
#endif
|
||
/* If we still don't know which osabi to pick, pick none. */
|
||
if (info->osabi == GDB_OSABI_UNKNOWN)
|
||
info->osabi = GDB_OSABI_NONE;
|
||
|
||
/* Must have at least filled in the architecture. */
|
||
gdb_assert (info->bfd_arch_info != NULL);
|
||
}
|
||
|
||
/* Return "current" architecture. If the target is running, this is
|
||
the architecture of the selected frame. Otherwise, the "current"
|
||
architecture defaults to the target architecture.
|
||
|
||
This function should normally be called solely by the command
|
||
interpreter routines to determine the architecture to execute a
|
||
command in. */
|
||
struct gdbarch *
|
||
get_current_arch (void)
|
||
{
|
||
if (has_stack_frames ())
|
||
return get_frame_arch (get_selected_frame (NULL));
|
||
else
|
||
return target_gdbarch ();
|
||
}
|
||
|
||
int
|
||
default_has_shared_address_space (struct gdbarch *gdbarch)
|
||
{
|
||
/* Simply say no. In most unix-like targets each inferior/process
|
||
has its own address space. */
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
default_fast_tracepoint_valid_at (struct gdbarch *gdbarch, CORE_ADDR addr,
|
||
std::string *msg)
|
||
{
|
||
/* We don't know if maybe the target has some way to do fast
|
||
tracepoints that doesn't need gdbarch, so always say yes. */
|
||
if (msg)
|
||
msg->clear ();
|
||
return 1;
|
||
}
|
||
|
||
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);
|
||
}
|
||
int
|
||
default_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
|
||
struct regcache *regcache,
|
||
CORE_ADDR *pcptr)
|
||
{
|
||
return gdbarch_breakpoint_kind_from_pc (gdbarch, pcptr);
|
||
}
|
||
|
||
|
||
void
|
||
default_gen_return_address (struct gdbarch *gdbarch,
|
||
struct agent_expr *ax, struct axs_value *value,
|
||
CORE_ADDR scope)
|
||
{
|
||
error (_("This architecture has no method to collect a return address."));
|
||
}
|
||
|
||
int
|
||
default_return_in_first_hidden_param_p (struct gdbarch *gdbarch,
|
||
struct type *type)
|
||
{
|
||
/* Usually, the return value's address is stored the in the "first hidden"
|
||
parameter if the return value should be passed by reference, as
|
||
specified in ABI. */
|
||
return !(language_pass_by_reference (type).trivially_copyable);
|
||
}
|
||
|
||
int default_insn_is_call (struct gdbarch *gdbarch, CORE_ADDR addr)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int default_insn_is_ret (struct gdbarch *gdbarch, CORE_ADDR addr)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int default_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
|
||
bool
|
||
default_program_breakpoint_here_p (struct gdbarch *gdbarch,
|
||
CORE_ADDR address)
|
||
{
|
||
int len;
|
||
const gdb_byte *bpoint = gdbarch_breakpoint_from_pc (gdbarch, &address, &len);
|
||
|
||
/* Software breakpoints unsupported? */
|
||
if (bpoint == nullptr)
|
||
return false;
|
||
|
||
gdb_byte *target_mem = (gdb_byte *) alloca (len);
|
||
|
||
/* Enable the automatic memory restoration from breakpoints while
|
||
we read the memory. Otherwise we may find temporary breakpoints, ones
|
||
inserted by GDB, and flag them as permanent breakpoints. */
|
||
scoped_restore restore_memory
|
||
= make_scoped_restore_show_memory_breakpoints (0);
|
||
|
||
if (target_read_memory (address, target_mem, len) == 0)
|
||
{
|
||
/* Check if this is a breakpoint instruction for this architecture,
|
||
including ones used by GDB. */
|
||
if (memcmp (target_mem, bpoint, len) == 0)
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
void
|
||
default_skip_permanent_breakpoint (struct regcache *regcache)
|
||
{
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
CORE_ADDR current_pc = regcache_read_pc (regcache);
|
||
int bp_len;
|
||
|
||
gdbarch_breakpoint_from_pc (gdbarch, ¤t_pc, &bp_len);
|
||
current_pc += bp_len;
|
||
regcache_write_pc (regcache, current_pc);
|
||
}
|
||
|
||
CORE_ADDR
|
||
default_infcall_mmap (CORE_ADDR size, unsigned prot)
|
||
{
|
||
error (_("This target does not support inferior memory allocation by mmap."));
|
||
}
|
||
|
||
void
|
||
default_infcall_munmap (CORE_ADDR addr, CORE_ADDR size)
|
||
{
|
||
/* Memory reserved by inferior mmap is kept leaked. */
|
||
}
|
||
|
||
/* -mcmodel=large is used so that no GOT (Global Offset Table) is needed to be
|
||
created in inferior memory by GDB (normally it is set by ld.so). */
|
||
|
||
std::string
|
||
default_gcc_target_options (struct gdbarch *gdbarch)
|
||
{
|
||
return string_printf ("-m%d%s", gdbarch_ptr_bit (gdbarch),
|
||
(gdbarch_ptr_bit (gdbarch) == 64
|
||
? " -mcmodel=large" : ""));
|
||
}
|
||
|
||
/* gdbarch gnu_triplet_regexp method. */
|
||
|
||
const char *
|
||
default_gnu_triplet_regexp (struct gdbarch *gdbarch)
|
||
{
|
||
return gdbarch_bfd_arch_info (gdbarch)->arch_name;
|
||
}
|
||
|
||
/* Default method for gdbarch_addressable_memory_unit_size. The default is
|
||
based on the bits_per_byte defined in the bfd library for the current
|
||
architecture, this is usually 8-bits, and so this function will usually
|
||
return 1 indicating 1 byte is 1 octet. */
|
||
|
||
int
|
||
default_addressable_memory_unit_size (struct gdbarch *gdbarch)
|
||
{
|
||
return gdbarch_bfd_arch_info (gdbarch)->bits_per_byte / 8;
|
||
}
|
||
|
||
void
|
||
default_guess_tracepoint_registers (struct gdbarch *gdbarch,
|
||
struct regcache *regcache,
|
||
CORE_ADDR addr)
|
||
{
|
||
int pc_regno = gdbarch_pc_regnum (gdbarch);
|
||
gdb_byte *regs;
|
||
|
||
/* This guessing code below only works if the PC register isn't
|
||
a pseudo-register. The value of a pseudo-register isn't stored
|
||
in the (non-readonly) regcache -- instead it's recomputed
|
||
(probably from some other cached raw register) whenever the
|
||
register is read. In this case, a custom method implementation
|
||
should be used by the architecture. */
|
||
if (pc_regno < 0 || pc_regno >= gdbarch_num_regs (gdbarch))
|
||
return;
|
||
|
||
regs = (gdb_byte *) alloca (register_size (gdbarch, pc_regno));
|
||
store_unsigned_integer (regs, register_size (gdbarch, pc_regno),
|
||
gdbarch_byte_order (gdbarch), addr);
|
||
regcache->raw_supply (pc_regno, regs);
|
||
}
|
||
|
||
int
|
||
default_print_insn (bfd_vma memaddr, disassemble_info *info)
|
||
{
|
||
disassembler_ftype disassemble_fn;
|
||
|
||
disassemble_fn = disassembler (info->arch, info->endian == BFD_ENDIAN_BIG,
|
||
info->mach, current_program_space->exec_bfd ());
|
||
|
||
gdb_assert (disassemble_fn != NULL);
|
||
return (*disassemble_fn) (memaddr, info);
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
|
||
CORE_ADDR
|
||
gdbarch_skip_prologue_noexcept (gdbarch *gdbarch, CORE_ADDR pc) noexcept
|
||
{
|
||
CORE_ADDR new_pc = pc;
|
||
|
||
try
|
||
{
|
||
new_pc = gdbarch_skip_prologue (gdbarch, pc);
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{}
|
||
|
||
return new_pc;
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
|
||
bool
|
||
default_in_indirect_branch_thunk (gdbarch *gdbarch, CORE_ADDR pc)
|
||
{
|
||
return false;
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
|
||
ULONGEST
|
||
default_type_align (struct gdbarch *gdbarch, struct type *type)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
|
||
std::string
|
||
default_get_pc_address_flags (frame_info *frame, CORE_ADDR pc)
|
||
{
|
||
return "";
|
||
}
|
||
|
||
/* See arch-utils.h. */
|
||
void
|
||
default_read_core_file_mappings
|
||
(struct gdbarch *gdbarch,
|
||
struct bfd *cbfd,
|
||
read_core_file_mappings_pre_loop_ftype pre_loop_cb,
|
||
read_core_file_mappings_loop_ftype loop_cb)
|
||
{
|
||
}
|
||
|
||
/* Static function declarations */
|
||
|
||
static void alloc_gdbarch_data (struct gdbarch *);
|
||
|
||
/* Non-zero if we want to trace architecture code. */
|
||
|
||
#ifndef GDBARCH_DEBUG
|
||
#define GDBARCH_DEBUG 0
|
||
#endif
|
||
unsigned int gdbarch_debug = GDBARCH_DEBUG;
|
||
static void
|
||
show_gdbarch_debug (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
gdb_printf (file, _("Architecture debugging is %s.\n"), value);
|
||
}
|
||
|
||
static const char *
|
||
pformat (const struct floatformat **format)
|
||
{
|
||
if (format == NULL)
|
||
return "(null)";
|
||
else
|
||
/* Just print out one of them - this is only for diagnostics. */
|
||
return format[0]->name;
|
||
}
|
||
|
||
static const char *
|
||
pstring (const char *string)
|
||
{
|
||
if (string == NULL)
|
||
return "(null)";
|
||
return string;
|
||
}
|
||
|
||
static const char *
|
||
pstring_ptr (char **string)
|
||
{
|
||
if (string == NULL || *string == NULL)
|
||
return "(null)";
|
||
return *string;
|
||
}
|
||
|
||
/* Helper function to print a list of strings, represented as "const
|
||
char *const *". The list is printed comma-separated. */
|
||
|
||
static const char *
|
||
pstring_list (const char *const *list)
|
||
{
|
||
static char ret[100];
|
||
const char *const *p;
|
||
size_t offset = 0;
|
||
|
||
if (list == NULL)
|
||
return "(null)";
|
||
|
||
ret[0] = '\0';
|
||
for (p = list; *p != NULL && offset < sizeof (ret); ++p)
|
||
{
|
||
size_t s = xsnprintf (ret + offset, sizeof (ret) - offset, "%s, ", *p);
|
||
offset += 2 + s;
|
||
}
|
||
|
||
if (offset > 0)
|
||
{
|
||
gdb_assert (offset - 2 < sizeof (ret));
|
||
ret[offset - 2] = '\0';
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
#include "gdbarch.c"
|
||
|
||
obstack *gdbarch_obstack (gdbarch *arch)
|
||
{
|
||
return arch->obstack;
|
||
}
|
||
|
||
/* See gdbarch.h. */
|
||
|
||
char *
|
||
gdbarch_obstack_strdup (struct gdbarch *arch, const char *string)
|
||
{
|
||
return obstack_strdup (arch->obstack, string);
|
||
}
|
||
|
||
|
||
/* Free a gdbarch struct. This should never happen in normal
|
||
operation --- once you've created a gdbarch, you keep it around.
|
||
However, if an architecture's init function encounters an error
|
||
building the structure, it may need to clean up a partially
|
||
constructed gdbarch. */
|
||
|
||
void
|
||
gdbarch_free (struct gdbarch *arch)
|
||
{
|
||
struct obstack *obstack;
|
||
|
||
gdb_assert (arch != NULL);
|
||
gdb_assert (!arch->initialized_p);
|
||
obstack = arch->obstack;
|
||
obstack_free (obstack, 0); /* Includes the ARCH. */
|
||
xfree (obstack);
|
||
}
|
||
|
||
/* See gdbarch.h. */
|
||
|
||
struct gdbarch_tdep *
|
||
gdbarch_tdep_1 (struct gdbarch *gdbarch)
|
||
{
|
||
if (gdbarch_debug >= 2)
|
||
gdb_printf (gdb_stdlog, "gdbarch_tdep_1 called\n");
|
||
return gdbarch->tdep;
|
||
}
|
||
|
||
/* Keep a registry of per-architecture data-pointers required by GDB
|
||
modules. */
|
||
|
||
struct gdbarch_data
|
||
{
|
||
unsigned index;
|
||
int init_p;
|
||
gdbarch_data_pre_init_ftype *pre_init;
|
||
gdbarch_data_post_init_ftype *post_init;
|
||
};
|
||
|
||
struct gdbarch_data_registration
|
||
{
|
||
struct gdbarch_data *data;
|
||
struct gdbarch_data_registration *next;
|
||
};
|
||
|
||
struct gdbarch_data_registry
|
||
{
|
||
unsigned nr;
|
||
struct gdbarch_data_registration *registrations;
|
||
};
|
||
|
||
static struct gdbarch_data_registry gdbarch_data_registry =
|
||
{
|
||
0, NULL,
|
||
};
|
||
|
||
static struct gdbarch_data *
|
||
gdbarch_data_register (gdbarch_data_pre_init_ftype *pre_init,
|
||
gdbarch_data_post_init_ftype *post_init)
|
||
{
|
||
struct gdbarch_data_registration **curr;
|
||
|
||
/* Append the new registration. */
|
||
for (curr = &gdbarch_data_registry.registrations;
|
||
(*curr) != NULL;
|
||
curr = &(*curr)->next);
|
||
(*curr) = XNEW (struct gdbarch_data_registration);
|
||
(*curr)->next = NULL;
|
||
(*curr)->data = XNEW (struct gdbarch_data);
|
||
(*curr)->data->index = gdbarch_data_registry.nr++;
|
||
(*curr)->data->pre_init = pre_init;
|
||
(*curr)->data->post_init = post_init;
|
||
(*curr)->data->init_p = 1;
|
||
return (*curr)->data;
|
||
}
|
||
|
||
struct gdbarch_data *
|
||
gdbarch_data_register_pre_init (gdbarch_data_pre_init_ftype *pre_init)
|
||
{
|
||
return gdbarch_data_register (pre_init, NULL);
|
||
}
|
||
|
||
struct gdbarch_data *
|
||
gdbarch_data_register_post_init (gdbarch_data_post_init_ftype *post_init)
|
||
{
|
||
return gdbarch_data_register (NULL, post_init);
|
||
}
|
||
|
||
/* Create/delete the gdbarch data vector. */
|
||
|
||
static void
|
||
alloc_gdbarch_data (struct gdbarch *gdbarch)
|
||
{
|
||
gdb_assert (gdbarch->data == NULL);
|
||
gdbarch->nr_data = gdbarch_data_registry.nr;
|
||
gdbarch->data = GDBARCH_OBSTACK_CALLOC (gdbarch, gdbarch->nr_data, void *);
|
||
}
|
||
|
||
/* Return the current value of the specified per-architecture
|
||
data-pointer. */
|
||
|
||
void *
|
||
gdbarch_data (struct gdbarch *gdbarch, struct gdbarch_data *data)
|
||
{
|
||
gdb_assert (data->index < gdbarch->nr_data);
|
||
if (gdbarch->data[data->index] == NULL)
|
||
{
|
||
/* The data-pointer isn't initialized, call init() to get a
|
||
value. */
|
||
if (data->pre_init != NULL)
|
||
/* Mid architecture creation: pass just the obstack, and not
|
||
the entire architecture, as that way it isn't possible for
|
||
pre-init code to refer to undefined architecture
|
||
fields. */
|
||
gdbarch->data[data->index] = data->pre_init (gdbarch->obstack);
|
||
else if (gdbarch->initialized_p
|
||
&& data->post_init != NULL)
|
||
/* Post architecture creation: pass the entire architecture
|
||
(as all fields are valid), but be careful to also detect
|
||
recursive references. */
|
||
{
|
||
gdb_assert (data->init_p);
|
||
data->init_p = 0;
|
||
gdbarch->data[data->index] = data->post_init (gdbarch);
|
||
data->init_p = 1;
|
||
}
|
||
else
|
||
internal_error (__FILE__, __LINE__,
|
||
_("gdbarch post-init data field can only be used "
|
||
"after gdbarch is fully initialised"));
|
||
gdb_assert (gdbarch->data[data->index] != NULL);
|
||
}
|
||
return gdbarch->data[data->index];
|
||
}
|
||
|
||
|
||
/* Keep a registry of the architectures known by GDB. */
|
||
|
||
struct gdbarch_registration
|
||
{
|
||
enum bfd_architecture bfd_architecture;
|
||
gdbarch_init_ftype *init;
|
||
gdbarch_dump_tdep_ftype *dump_tdep;
|
||
struct gdbarch_list *arches;
|
||
struct gdbarch_registration *next;
|
||
};
|
||
|
||
static struct gdbarch_registration *gdbarch_registry = NULL;
|
||
|
||
std::vector<const char *>
|
||
gdbarch_printable_names ()
|
||
{
|
||
/* Accumulate a list of names based on the registed list of
|
||
architectures. */
|
||
std::vector<const char *> arches;
|
||
|
||
for (gdbarch_registration *rego = gdbarch_registry;
|
||
rego != nullptr;
|
||
rego = rego->next)
|
||
{
|
||
const struct bfd_arch_info *ap
|
||
= bfd_lookup_arch (rego->bfd_architecture, 0);
|
||
if (ap == nullptr)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("gdbarch_architecture_names: multi-arch unknown"));
|
||
do
|
||
{
|
||
arches.push_back (ap->printable_name);
|
||
ap = ap->next;
|
||
}
|
||
while (ap != NULL);
|
||
}
|
||
|
||
return arches;
|
||
}
|
||
|
||
|
||
void
|
||
gdbarch_register (enum bfd_architecture bfd_architecture,
|
||
gdbarch_init_ftype *init,
|
||
gdbarch_dump_tdep_ftype *dump_tdep)
|
||
{
|
||
struct gdbarch_registration **curr;
|
||
const struct bfd_arch_info *bfd_arch_info;
|
||
|
||
/* Check that BFD recognizes this architecture */
|
||
bfd_arch_info = bfd_lookup_arch (bfd_architecture, 0);
|
||
if (bfd_arch_info == NULL)
|
||
{
|
||
internal_error (__FILE__, __LINE__,
|
||
_("gdbarch: Attempt to register "
|
||
"unknown architecture (%d)"),
|
||
bfd_architecture);
|
||
}
|
||
/* Check that we haven't seen this architecture before. */
|
||
for (curr = &gdbarch_registry;
|
||
(*curr) != NULL;
|
||
curr = &(*curr)->next)
|
||
{
|
||
if (bfd_architecture == (*curr)->bfd_architecture)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("gdbarch: Duplicate registration "
|
||
"of architecture (%s)"),
|
||
bfd_arch_info->printable_name);
|
||
}
|
||
/* log it */
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "register_gdbarch_init (%s, %s)\n",
|
||
bfd_arch_info->printable_name,
|
||
host_address_to_string (init));
|
||
/* Append it */
|
||
(*curr) = XNEW (struct gdbarch_registration);
|
||
(*curr)->bfd_architecture = bfd_architecture;
|
||
(*curr)->init = init;
|
||
(*curr)->dump_tdep = dump_tdep;
|
||
(*curr)->arches = NULL;
|
||
(*curr)->next = NULL;
|
||
}
|
||
|
||
void
|
||
register_gdbarch_init (enum bfd_architecture bfd_architecture,
|
||
gdbarch_init_ftype *init)
|
||
{
|
||
gdbarch_register (bfd_architecture, init, NULL);
|
||
}
|
||
|
||
|
||
/* Look for an architecture using gdbarch_info. */
|
||
|
||
struct gdbarch_list *
|
||
gdbarch_list_lookup_by_info (struct gdbarch_list *arches,
|
||
const struct gdbarch_info *info)
|
||
{
|
||
for (; arches != NULL; arches = arches->next)
|
||
{
|
||
if (info->bfd_arch_info != arches->gdbarch->bfd_arch_info)
|
||
continue;
|
||
if (info->byte_order != arches->gdbarch->byte_order)
|
||
continue;
|
||
if (info->osabi != arches->gdbarch->osabi)
|
||
continue;
|
||
if (info->target_desc != arches->gdbarch->target_desc)
|
||
continue;
|
||
return arches;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
|
||
/* Find an architecture that matches the specified INFO. Create a new
|
||
architecture if needed. Return that new architecture. */
|
||
|
||
struct gdbarch *
|
||
gdbarch_find_by_info (struct gdbarch_info info)
|
||
{
|
||
struct gdbarch *new_gdbarch;
|
||
struct gdbarch_registration *rego;
|
||
|
||
/* Fill in missing parts of the INFO struct using a number of
|
||
sources: "set ..."; INFOabfd supplied; and the global
|
||
defaults. */
|
||
gdbarch_info_fill (&info);
|
||
|
||
/* Must have found some sort of architecture. */
|
||
gdb_assert (info.bfd_arch_info != NULL);
|
||
|
||
if (gdbarch_debug)
|
||
{
|
||
gdb_printf (gdb_stdlog,
|
||
"gdbarch_find_by_info: info.bfd_arch_info %s\n",
|
||
(info.bfd_arch_info != NULL
|
||
? info.bfd_arch_info->printable_name
|
||
: "(null)"));
|
||
gdb_printf (gdb_stdlog,
|
||
"gdbarch_find_by_info: info.byte_order %d (%s)\n",
|
||
info.byte_order,
|
||
(info.byte_order == BFD_ENDIAN_BIG ? "big"
|
||
: info.byte_order == BFD_ENDIAN_LITTLE ? "little"
|
||
: "default"));
|
||
gdb_printf (gdb_stdlog,
|
||
"gdbarch_find_by_info: info.osabi %d (%s)\n",
|
||
info.osabi, gdbarch_osabi_name (info.osabi));
|
||
gdb_printf (gdb_stdlog,
|
||
"gdbarch_find_by_info: info.abfd %s\n",
|
||
host_address_to_string (info.abfd));
|
||
}
|
||
|
||
/* Find the tdep code that knows about this architecture. */
|
||
for (rego = gdbarch_registry;
|
||
rego != NULL;
|
||
rego = rego->next)
|
||
if (rego->bfd_architecture == info.bfd_arch_info->arch)
|
||
break;
|
||
if (rego == NULL)
|
||
{
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_find_by_info: "
|
||
"No matching architecture\n");
|
||
return 0;
|
||
}
|
||
|
||
/* Ask the tdep code for an architecture that matches "info". */
|
||
new_gdbarch = rego->init (info, rego->arches);
|
||
|
||
/* Did the tdep code like it? No. Reject the change and revert to
|
||
the old architecture. */
|
||
if (new_gdbarch == NULL)
|
||
{
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_find_by_info: "
|
||
"Target rejected architecture\n");
|
||
return NULL;
|
||
}
|
||
|
||
/* Is this a pre-existing architecture (as determined by already
|
||
being initialized)? Move it to the front of the architecture
|
||
list (keeping the list sorted Most Recently Used). */
|
||
if (new_gdbarch->initialized_p)
|
||
{
|
||
struct gdbarch_list **list;
|
||
struct gdbarch_list *self;
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_find_by_info: "
|
||
"Previous architecture %s (%s) selected\n",
|
||
host_address_to_string (new_gdbarch),
|
||
new_gdbarch->bfd_arch_info->printable_name);
|
||
/* Find the existing arch in the list. */
|
||
for (list = ®o->arches;
|
||
(*list) != NULL && (*list)->gdbarch != new_gdbarch;
|
||
list = &(*list)->next);
|
||
/* It had better be in the list of architectures. */
|
||
gdb_assert ((*list) != NULL && (*list)->gdbarch == new_gdbarch);
|
||
/* Unlink SELF. */
|
||
self = (*list);
|
||
(*list) = self->next;
|
||
/* Insert SELF at the front. */
|
||
self->next = rego->arches;
|
||
rego->arches = self;
|
||
/* Return it. */
|
||
return new_gdbarch;
|
||
}
|
||
|
||
/* It's a new architecture. */
|
||
if (gdbarch_debug)
|
||
gdb_printf (gdb_stdlog, "gdbarch_find_by_info: "
|
||
"New architecture %s (%s) selected\n",
|
||
host_address_to_string (new_gdbarch),
|
||
new_gdbarch->bfd_arch_info->printable_name);
|
||
|
||
/* Insert the new architecture into the front of the architecture
|
||
list (keep the list sorted Most Recently Used). */
|
||
{
|
||
struct gdbarch_list *self = XNEW (struct gdbarch_list);
|
||
self->next = rego->arches;
|
||
self->gdbarch = new_gdbarch;
|
||
rego->arches = self;
|
||
}
|
||
|
||
/* Check that the newly installed architecture is valid. Plug in
|
||
any post init values. */
|
||
new_gdbarch->dump_tdep = rego->dump_tdep;
|
||
verify_gdbarch (new_gdbarch);
|
||
new_gdbarch->initialized_p = 1;
|
||
|
||
if (gdbarch_debug)
|
||
gdbarch_dump (new_gdbarch, gdb_stdlog);
|
||
|
||
return new_gdbarch;
|
||
}
|
||
|
||
/* Make the specified architecture current. */
|
||
|
||
void
|
||
set_target_gdbarch (struct gdbarch *new_gdbarch)
|
||
{
|
||
gdb_assert (new_gdbarch != NULL);
|
||
gdb_assert (new_gdbarch->initialized_p);
|
||
current_inferior ()->gdbarch = new_gdbarch;
|
||
gdb::observers::architecture_changed.notify (new_gdbarch);
|
||
registers_changed ();
|
||
}
|
||
|
||
/* Return the current inferior's arch. */
|
||
|
||
struct gdbarch *
|
||
target_gdbarch (void)
|
||
{
|
||
return current_inferior ()->gdbarch;
|
||
}
|
||
|
||
void _initialize_gdbarch_utils ();
|
||
void
|
||
_initialize_gdbarch_utils ()
|
||
{
|
||
add_setshow_enum_cmd ("endian", class_support,
|
||
endian_enum, &set_endian_string,
|
||
_("Set endianness of target."),
|
||
_("Show endianness of target."),
|
||
NULL, set_endian, show_endian,
|
||
&setlist, &showlist);
|
||
add_setshow_zuinteger_cmd ("arch", class_maintenance, &gdbarch_debug, _("\
|
||
Set architecture debugging."), _("\
|
||
Show architecture debugging."), _("\
|
||
When non-zero, architecture debugging is enabled."),
|
||
NULL,
|
||
show_gdbarch_debug,
|
||
&setdebuglist, &showdebuglist);
|
||
}
|