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Do arm_abi detection for ELFOSABI_GNU binaries

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On ARM systems, gdb must determine which style of breakpoint to use
(see the comments at the beginning of gdb/arm-linux-tdep.c).  In
arm_gdbarch_init we only attempt to extract the eabi version from the
ELF binary if it is a ELFOSABI_NONE binary.  If the binary is
ELFOSABI_GNU instead, we end up defaulting to the old style OABI
syscall breakpoint instruction.  On a Linux kernel built without
CONFIG_OABI_COMPAT, this triggers a SIGILL in ld when attempting to
execute any ELFOSABI_GNU program.
(e.g. https://github.com/raspberrypi/linux/issues/766)

gdb/

2015-05-28  Kyle Huey  <me@kylehuey.com>  (tiny patch)

	* gdb/arm-tdep.c (arm_gdbarch_init): Perform arm_abi detection on
	ELFOSABI_GNU binaries.
This commit is contained in:
Kyle Huey 2015-05-28 09:12:12 +01:00 committed by Yao Qi
parent 124b4f8708
commit d403db2720
2 changed files with 6 additions and 1 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2015-05-28 Kyle Huey <me@kylehuey.com> (tiny patch)
* gdb/arm-tdep.c (arm_gdbarch_init): Perform arm_abi detection on
ELFOSABI_GNU binaries.
2015-05-27 Doug Evans <dje@google.com>
* dwarf2read.c (lnp_state_machine): New typedef.

2
gdb/arm-tdep.c
View File

@ -9950,7 +9950,7 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
anyway, so assume APCS. */
arm_abi = ARM_ABI_APCS;
}
else if (ei_osabi == ELFOSABI_NONE)
else if (ei_osabi == ELFOSABI_NONE || ei_osabi == ELFOSABI_GNU)
{
int eabi_ver = EF_ARM_EABI_VERSION (e_flags);
int attr_arch, attr_profile;