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[ARC] Parse NOTE section in core dump files

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This patch adds function elf32_arc_grok_parse to parse NOTE section of core
dump files. GDB requires this to work properly with core dumps.

bfd/
2016-08-24  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* elf32-arc.c (elf32_arc_grok_prstatus): New function.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
This commit is contained in:
Anton Kolesov 2013-09-12 15:56:45 +04:00 committed by Claudiu Zissulescu
parent 1130c90ed7
commit 47f7f636bc
2 changed files with 39 additions and 0 deletions
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4
bfd/ChangeLog
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@ -1,3 +1,7 @@
2016-08-24 Anton Kolesov <Anton.Kolesov@synopsys.com>
* elf32-arc.c (elf32_arc_grok_prstatus): New function.
2016-08-23 Nick Clifton <nickc@redhat.com>
* elf32-arm.c (elf32_arm_count_additional_relocs): Return zero if

35
bfd/elf32-arc.c
View File

@ -2439,6 +2439,39 @@ elf_arc_add_symbol_hook (bfd * abfd,
return TRUE;
}
/* GDB expects general purpose registers to be in section .reg. However Linux
kernel doesn't create this section and instead writes registers to NOTE
section. It is up to the binutils to create a pseudo-section .reg from the
contents of NOTE. Also BFD will read pid and signal number from NOTE. This
function relies on offsets inside elf_prstatus structure in Linux to be
stable. */
static bfd_boolean
elf32_arc_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
{
int offset;
size_t size;
switch (note->descsz)
{
default:
return FALSE;
case 236: /* sizeof (struct elf_prstatus) on Linux/arc. */
/* pr_cursig */
elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
/* pr_pid */
elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
/* pr_regs */
offset = 72;
size = (40 * 4); /* There are 40 registers in user_regs_struct. */
break;
}
/* Make a ".reg/999" section. */
return _bfd_elfcore_make_pseudosection (abfd, ".reg", size,
note->descpos + offset);
}
#define TARGET_LITTLE_SYM arc_elf32_le_vec
#define TARGET_LITTLE_NAME "elf32-littlearc"
#define TARGET_BIG_SYM arc_elf32_be_vec
@ -2484,6 +2517,8 @@ elf_arc_add_symbol_hook (bfd * abfd,
#define elf_backend_may_use_rela_p 1
#define elf_backend_default_use_rela_p 1
#define elf_backend_grok_prstatus elf32_arc_grok_prstatus
#define elf_backend_default_execstack 0
#include "elf32-target.h"