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binutils-gdb/gdb/config.in
Simon Marchi 1eb3991427 gdb, gdbserver: remove configure check for fs_base/gs_base in user_regs_struct 
I recently stumbled on this code mentioning Linux kernel 2.6.25, and
thought it could be time for some spring cleaning (newer GDBs probably
don't need to supports 12-year old kernels).  I then found that the
"legacy" case is probably broken anyway, which gives an even better
motivation for its removal.

In short, this patch removes the configure checks that check if
user_regs_struct contains the fs_base/gs_base fields and adjusts all
uses of the HAVE_STRUCT_USER_REGS_STRUCT_{FS,GS}_BASE macros.  The
longer explanation/rationale follows.

Apparently, Linux kernels since 2.6.25 (that's from 2008) have been
reliably providing fs_base and gs_base as part of user_regs_struct.
Commit df5d438e33d7 in the Linux kernel [1] seems related.  This means
that we can get these values by reading registers with PTRACE_GETREGS.
Previously, these values were obtained using a separate
PTRACE_ARCH_PRCTL ptrace call.

First, I'm not even sure the configure check was really right in the
first place.

The user_regs_struct used by GDB comes from
/usr/include/x86_64-linux-gnu/sys/user.h (or equivalent on other
distros) and is provided by glibc.  glibc has had the fs_base/gs_base
fields in there for a very long time, at least since this commit from
2001 [2].  The Linux kernel also has its version of user_regs_struct,
which I think was exported to user-space at some point.  It included the
fs_base/gs_base fields since at least this 2002 commit [3].  In any
case, my conclusion is that the fields were there long before the
aforementioned Linux kernel commit.  The kernel commit didn't add these
fields, it only made sure that they have reliable values when obtained
with PTRACE_GETREGS.

So, checking for the presence of the fs_base/gs_base fields in struct
user_regs_struct doesn't sound like a good way of knowing if we can
reliably get the fs_base/gs_base values from PTRACE_GETREGS.  My guess
is that if we were using that strategy on a < 2.6.25 kernel, things
would not work correctly:

- configure would find that the user_regs_struct has the fs_base/gs_base
  fields (which are probided by glibc anyway)
- we would be reading the fs_base/gs_base values using PTRACE_GETREGS,
  for which the kernel would provide unreliable values

Second, I have tried to see how things worked by forcing GDB to not use
fs_base/gs_base from PTRACE_GETREGS (forcing it to use the "legacy"
code, by configuring with

  ac_cv_member_struct_user_regs_struct_gs_base=no ac_cv_member_struct_user_regs_struct_fs_base=no

Doing so breaks writing registers back to the inferior.  For example,
calling an inferior functions gives an internal error:

    (gdb) p malloc(10)
    /home/smarchi/src/binutils-gdb/gdb/i387-tdep.c:1408: internal-error: invalid i387 regnum 152

The relevant last frames where this error happens are:

    #8  0x0000563123d262fc in internal_error (file=0x563123e93fd8 "/home/smarchi/src/binutils-gdb/gdb/i387-tdep.c", line=1408, fmt=0x563123e94482 "invalid i387 regnum %d") at /home/smarchi/src/binutils-gdb/gdbsupport/errors.cc:55
    #9  0x0000563123047d0d in i387_collect_xsave (regcache=0x5631269453f0, regnum=152, xsave=0x7ffd38402a20, gcore=0) at /home/smarchi/src/binutils-gdb/gdb/i387-tdep.c:1408
    #10 0x0000563122c69e8a in amd64_collect_xsave (regcache=0x5631269453f0, regnum=152, xsave=0x7ffd38402a20, gcore=0) at /home/smarchi/src/binutils-gdb/gdb/amd64-tdep.c:3448
    #11 0x0000563122c5e94c in amd64_linux_nat_target::store_registers (this=0x56312515fd10 <the_amd64_linux_nat_target>, regcache=0x5631269453f0, regnum=152) at /home/smarchi/src/binutils-gdb/gdb/amd64-linux-nat.c:335
    #12 0x00005631234c8c80 in target_store_registers (regcache=0x5631269453f0, regno=152) at /home/smarchi/src/binutils-gdb/gdb/target.c:3485
    #13 0x00005631232e8df7 in regcache::raw_write (this=0x5631269453f0, regnum=152, buf=0x56312759e468 "@\225\372\367\377\177") at /home/smarchi/src/binutils-gdb/gdb/regcache.c:765
    #14 0x00005631232e8f0c in regcache::cooked_write (this=0x5631269453f0, regnum=152, buf=0x56312759e468 "@\225\372\367\377\177") at /home/smarchi/src/binutils-gdb/gdb/regcache.c:778
    #15 0x00005631232e75ec in regcache::restore (this=0x5631269453f0, src=0x5631275eb130) at /home/smarchi/src/binutils-gdb/gdb/regcache.c:283
    #16 0x0000563123083fc4 in infcall_suspend_state::restore (this=0x5631273ed930, gdbarch=0x56312718cf20, tp=0x5631270bca90, regcache=0x5631269453f0) at /home/smarchi/src/binutils-gdb/gdb/infrun.c:9103
    #17 0x0000563123081eed in restore_infcall_suspend_state (inf_state=0x5631273ed930) at /home/smarchi/src/binutils-gdb/gdb/infrun.c:9151

The problem seems to be that amd64_linux_nat_target::store_registers
calls amd64_native_gregset_supplies_p to know whether gregset provides
fs_base.  When !HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE,
amd64_native_gregset_supplies_p returns false.  store_registers
therefore assumes that it must be an "xstate" register.  This is of
course wrong, and that leads to the failed assertion when
i387_collect_xsave doesn't recognize the register.

amd64_linux_nat_target::store_registers could probably be fixed to
handle this case, but I don't think it's worth it, given that it would
only be to support very old kernels.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=df5d438e33d7fc914ba9b6e0d6b019a8966c5fcc
[2] https://sourceware.org/git/?p=glibc.git;a=commit;h=c9cf6ddeebb7bb
[3] https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=88e4bc32686ebd0b1111a94f93eba2d334241f68

gdb/ChangeLog:

	* configure.ac: Remove check for fs_base/gs_base in
	user_regs_struct.
	* configure: Re-generate.
	* config.in: Re-generate.
	* amd64-nat.c (amd64_native_gregset_reg_offset): Adjust.
	* amd64-linux-nat.c (amd64_linux_nat_target::fetch_registers,
	amd64_linux_nat_target::store_registers, ps_get_thread_area, ): Adjust.

gdbserver/ChangeLog:

	* configure.ac: Remove check for fs_base/gs_base in
	user_regs_struct.
	* configure: Re-generate.
	* config.in: Re-generate.
	* linux-x86-low.cc (x86_64_regmap, x86_fill_gregset,
	x86_store_gregset): Adjust.
2020-04-27 10:47:50 -04:00

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/* config.in. Generated from configure.ac by autoheader. */
/* Define if building universal (internal helper macro) */
#undef AC_APPLE_UNIVERSAL_BUILD
/* Directories from which to load auto-loaded scripts. */
#undef AUTO_LOAD_DIR
/* Directories safe to hold auto-loaded files. */
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/* Directory of programs. */
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*/
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/* Define to 1 if std::thread works. */
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/* look for global separate debug info in this path [LIBDIR/debug] */
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/* Define if the separate-debug-dir directory should be relocated when GDB is
moved. */
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/* Define to BFD's default target vector. */
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/* Define to 1 if translation of program messages to the user's native
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/* Define if the gdb-datadir directory should be relocated when GDB is moved.
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/* Define as const if the declaration of iconv() needs const. */
#undef ICONV_CONST
/* directory to load the JIT readers from */
#undef JIT_READER_DIR
/* Define if the jit-reader-dir directory should be relocated when GDB is
moved. */
#undef JIT_READER_DIR_RELOCATABLE
/* Name of this package. */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Additional package description */
#undef PKGVERSION
/* Define to 1 if the "%H, %D and %DD" formats work to print decfloats. */
#undef PRINTF_HAS_DECFLOAT
/* Define to 1 if the "%Lg" format works to print long doubles. */
#undef PRINTF_HAS_LONG_DOUBLE
/* Define to 1 if the "%ll" format works to print long longs. */
#undef PRINTF_HAS_LONG_LONG
/* Define to necessary symbol if this constant uses a non-standard name on
your system. */
#undef PTHREAD_CREATE_JOINABLE
/* Define to the type of arg 1 for ptrace. */
#undef PTRACE_TYPE_ARG1
/* Define to the type of arg 3 for ptrace. */
#undef PTRACE_TYPE_ARG3
/* Define to the type of arg 4 for ptrace. */
#undef PTRACE_TYPE_ARG4
/* Define to the type of arg 5 for ptrace. */
#undef PTRACE_TYPE_ARG5
/* Define as the return type of ptrace. */
#undef PTRACE_TYPE_RET
/* Define if the python lib directory should be relocated when GDB is moved.
*/
#undef PYTHON_LIBDIR_RELOCATABLE
/* Define if the python directory should be relocated when GDB is moved. */
#undef PYTHON_PATH_RELOCATABLE
/* Relocated directory for source files. */
#undef RELOC_SRCDIR
/* Bug reporting address */
#undef REPORT_BUGS_TO
/* Define to 1 if the "%Lg" format works to scan long doubles. */
#undef SCANF_HAS_LONG_DOUBLE
/* Define to 1 if the `setpgrp' function takes no argument. */
#undef SETPGRP_VOID
/* The size of `long', as computed by sizeof. */
#undef SIZEOF_LONG
/* The size of `long long', as computed by sizeof. */
#undef SIZEOF_LONG_LONG
/* The size of `unsigned long', as computed by sizeof. */
#undef SIZEOF_UNSIGNED_LONG
/* The size of `unsigned long long', as computed by sizeof. */
#undef SIZEOF_UNSIGNED_LONG_LONG
/* The size of `unsigned __int128', as computed by sizeof. */
#undef SIZEOF_UNSIGNED___INT128
/* If using the C implementation of alloca, define if you know the
direction of stack growth for your system; otherwise it will be
automatically deduced at runtime.
STACK_DIRECTION > 0 => grows toward higher addresses
STACK_DIRECTION < 0 => grows toward lower addresses
STACK_DIRECTION = 0 => direction of growth unknown */
#undef STACK_DIRECTION
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* automatically load a system-wide gdbinit file */
#undef SYSTEM_GDBINIT
/* automatically load system-wide gdbinit files from this directory */
#undef SYSTEM_GDBINIT_DIR
/* Define if the system-gdbinit-dir directory should be relocated when GDB is
moved. */
#undef SYSTEM_GDBINIT_DIR_RELOCATABLE
/* Define if the system-gdbinit directory should be relocated when GDB is
moved. */
#undef SYSTEM_GDBINIT_RELOCATABLE
/* search for usr/lib et al within DIR */
#undef TARGET_SYSTEM_ROOT
/* Define if the sysroot directory should be relocated when GDB is moved. */
#undef TARGET_SYSTEM_ROOT_RELOCATABLE
/* Define if <thread_db.h> has the TD_NOTALLOC error code. */
#undef THREAD_DB_HAS_TD_NOTALLOC
/* Define if <thread_db.h> has the TD_NOTLS error code. */
#undef THREAD_DB_HAS_TD_NOTLS
/* Define if <thread_db.h> has the TD_VERSION error code. */
#undef THREAD_DB_HAS_TD_VERSION
/* Define to 1 if the regex included in libiberty should be used. */
#undef USE_INCLUDED_REGEX
/* Enable extensions on AIX 3, Interix. */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable GNU extensions on systems that have them. */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable threading extensions on Solaris. */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions on HP NonStop. */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable general extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
/* Define if we should use the Windows API, instead of the POSIX API. On
Windows, we use the Windows API when building for MinGW, but the POSIX API
when building for Cygwin. */
#undef USE_WIN32API
/* Define if the PPC simulator is being linked in. */
#undef WITH_PPC_SIM
/* Directory containing Python's standard libraries from --with-python-libdir.
*/
#undef WITH_PYTHON_LIBDIR
/* Define if --with-python provides a path, either directly or via
python-config.py --exec-prefix. */
#undef WITH_PYTHON_PATH
/* Define if the simulator is being linked in. */
#undef WITH_SIM
/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
significant byte first (like Motorola and SPARC, unlike Intel). */
#if defined AC_APPLE_UNIVERSAL_BUILD
# if defined __BIG_ENDIAN__
# define WORDS_BIGENDIAN 1
# endif
#else
# ifndef WORDS_BIGENDIAN
# undef WORDS_BIGENDIAN
# endif
#endif
/* Enable large inode numbers on Mac OS X 10.5. */
#ifndef _DARWIN_USE_64_BIT_INODE
# define _DARWIN_USE_64_BIT_INODE 1
#endif
/* Number of bits in a file offset, on hosts where this is settable. */
#undef _FILE_OFFSET_BITS
/* Define for large files, on AIX-style hosts. */
#undef _LARGE_FILES
/* Define to 1 if on MINIX. */
#undef _MINIX
/* Define to 2 if the system does not provide POSIX.1 features except with
this defined. */
#undef _POSIX_1_SOURCE
/* Define to 1 if you need to in order for `stat' and other things to work. */
#undef _POSIX_SOURCE
/* Define to empty if `const' does not conform to ANSI C. */
#undef const
/* Define to `__inline__' or `__inline' if that's what the C compiler
calls it, or to nothing if 'inline' is not supported under any name. */
#ifndef __cplusplus
#undef inline
#endif
/* Define to `int' if <sys/types.h> does not define. */
#undef pid_t
/* Define to `unsigned int' if <sys/types.h> does not define. */
#undef size_t
/* Define as `fork' if `vfork' does not work. */
#undef vfork
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