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Diffstat (limited to 'gdb/i386-tdep.c')
-rw-r--r--gdb/i386-tdep.c94
1 files changed, 90 insertions, 4 deletions
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 524a6ff..31ecb76 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -34,9 +34,12 @@
#include "regcache.h"
#include "doublest.h"
#include "value.h"
-#include "i386-tdep.h"
#include "gdb_assert.h"
+#include "elf-bfd.h"
+
+#include "i386-tdep.h"
+
#undef XMALLOC
#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
@@ -1205,21 +1208,104 @@ gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info)
}
+static void
+process_note_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
+{
+ int *os_ident_ptr = obj;
+ const char *name;
+ unsigned int sect_size;
+
+ name = bfd_get_section_name (abfd, sect);
+ sect_size = bfd_section_size (abfd, sect);
+ if (strcmp (name, ".note.ABI-tag") == 0 && sect_size > 0)
+ {
+ unsigned int name_length, data_length, note_type;
+ char *note = alloca (sect_size);
+
+ bfd_get_section_contents (abfd, sect, note,
+ (file_ptr) 0, (bfd_size_type) sect_size);
+
+ name_length = bfd_h_get_32 (abfd, note);
+ data_length = bfd_h_get_32 (abfd, note + 4);
+ note_type = bfd_h_get_32 (abfd, note + 8);
+
+ if (name_length == 4 && data_length == 16 && note_type == 1
+ && strcmp (note + 12, "GNU") == 0)
+ {
+ int os_number = bfd_h_get_32 (abfd, note + 16);
+
+ /* The case numbers are from abi-tags in glibc. */
+ switch (os_number)
+ {
+ case 0:
+ *os_ident_ptr = ELFOSABI_LINUX;
+ break;
+ case 1:
+ *os_ident_ptr = ELFOSABI_HURD;
+ break;
+ case 2:
+ *os_ident_ptr = ELFOSABI_SOLARIS;
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "process_note_abi_sections: "
+ "unknown OS number %d", os_number);
+ break;
+ }
+ }
+ }
+}
struct gdbarch *
i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch_tdep *tdep;
struct gdbarch *gdbarch;
+ int os_ident;
- /* For the moment there is only one i386 architecture. */
- if (arches != NULL)
- return arches->gdbarch;
+ if (info.abfd != NULL
+ && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
+ {
+ os_ident = elf_elfheader (info.abfd)->e_ident[EI_OSABI];
+
+ /* If os_ident is 0, it is not necessarily the case that we're
+ on a SYSV system. (ELFOSABI_NONE is defined to be 0.)
+ GNU/Linux uses a note section to record OS/ABI info, but
+ leaves e_ident[EI_OSABI] zero. So we have to check for note
+ sections too. */
+ if (os_ident == ELFOSABI_NONE)
+ bfd_map_over_sections (info.abfd,
+ process_note_abi_tag_sections,
+ &os_ident);
+
+ /* If that didn't help us, revert to some non-standard checks. */
+ if (os_ident == ELFOSABI_NONE)
+ {
+ /* FreeBSD folks are naughty; they stored the string
+ "FreeBSD" in the padding of the e_ident field of the ELF
+ header. */
+ if (strcmp (&elf_elfheader (info.abfd)->e_ident[8], "FreeBSD") == 0)
+ os_ident = ELFOSABI_FREEBSD;
+ }
+ }
+ else
+ os_ident = -1;
+
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ if (gdbarch_tdep (current_gdbarch)->os_ident != os_ident)
+ continue;
+ return arches->gdbarch;
+ }
/* Allocate space for the new architecture. */
tdep = XMALLOC (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
+ tdep->os_ident = os_ident;
+
/* FIXME: kettenis/2001-11-24: Although not all IA-32 processors
have the SSE registers, it's easier to set the default to 8. */
tdep->num_xmm_regs = 8;