* i386-tdep.h (struct gdbarch_tdep): Add `os_ident' member.
* i386-tdep.c: Include "elf-bfd.h". (process_note_abi_tag_sections): New function. (i386_gdbarch_init): Add code to recognize various OS/ABI combinations.
This commit is contained in:
Mark Kettenis
parent
c5ad026aef
commit
d2a7c97aaf
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@ -1,5 +1,11 @@
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2002-01-01 Mark Kettenis <kettenis@gnu.org>
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* i386-tdep.h (struct gdbarch_tdep): Add `os_ident' member.
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* i386-tdep.c: Include "elf-bfd.h".
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(process_note_abi_tag_sections): New function.
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(i386_gdbarch_init): Add code to recognize various OS/ABI
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combinations.
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* maint.c (_initialize_maint_cmds): Add missing \ in
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string-literal.
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@ -34,9 +34,12 @@
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#include "regcache.h"
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#include "doublest.h"
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#include "value.h"
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#include "i386-tdep.h"
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#include "gdb_assert.h"
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#include "elf-bfd.h"
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#include "i386-tdep.h"
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#undef XMALLOC
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#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
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@ -1205,21 +1208,104 @@ gdb_print_insn_i386 (bfd_vma memaddr, disassemble_info *info)
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}
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static void
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process_note_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
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{
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int *os_ident_ptr = obj;
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const char *name;
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unsigned int sect_size;
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name = bfd_get_section_name (abfd, sect);
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sect_size = bfd_section_size (abfd, sect);
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if (strcmp (name, ".note.ABI-tag") == 0 && sect_size > 0)
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{
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unsigned int name_length, data_length, note_type;
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char *note = alloca (sect_size);
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bfd_get_section_contents (abfd, sect, note,
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(file_ptr) 0, (bfd_size_type) sect_size);
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name_length = bfd_h_get_32 (abfd, note);
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data_length = bfd_h_get_32 (abfd, note + 4);
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note_type = bfd_h_get_32 (abfd, note + 8);
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if (name_length == 4 && data_length == 16 && note_type == 1
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&& strcmp (note + 12, "GNU") == 0)
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{
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int os_number = bfd_h_get_32 (abfd, note + 16);
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/* The case numbers are from abi-tags in glibc. */
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switch (os_number)
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{
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case 0:
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*os_ident_ptr = ELFOSABI_LINUX;
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break;
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case 1:
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*os_ident_ptr = ELFOSABI_HURD;
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break;
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case 2:
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*os_ident_ptr = ELFOSABI_SOLARIS;
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break;
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default:
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internal_error (__FILE__, __LINE__,
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"process_note_abi_sections: "
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"unknown OS number %d", os_number);
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break;
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}
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}
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}
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}
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struct gdbarch *
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i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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{
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struct gdbarch_tdep *tdep;
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struct gdbarch *gdbarch;
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int os_ident;
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/* For the moment there is only one i386 architecture. */
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if (arches != NULL)
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return arches->gdbarch;
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if (info.abfd != NULL
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&& bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
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{
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os_ident = elf_elfheader (info.abfd)->e_ident[EI_OSABI];
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/* If os_ident is 0, it is not necessarily the case that we're
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on a SYSV system. (ELFOSABI_NONE is defined to be 0.)
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GNU/Linux uses a note section to record OS/ABI info, but
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leaves e_ident[EI_OSABI] zero. So we have to check for note
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sections too. */
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if (os_ident == ELFOSABI_NONE)
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bfd_map_over_sections (info.abfd,
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process_note_abi_tag_sections,
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&os_ident);
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/* If that didn't help us, revert to some non-standard checks. */
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if (os_ident == ELFOSABI_NONE)
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{
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/* FreeBSD folks are naughty; they stored the string
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"FreeBSD" in the padding of the e_ident field of the ELF
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header. */
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if (strcmp (&elf_elfheader (info.abfd)->e_ident[8], "FreeBSD") == 0)
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os_ident = ELFOSABI_FREEBSD;
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}
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}
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else
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os_ident = -1;
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for (arches = gdbarch_list_lookup_by_info (arches, &info);
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arches != NULL;
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arches = gdbarch_list_lookup_by_info (arches->next, &info))
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{
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if (gdbarch_tdep (current_gdbarch)->os_ident != os_ident)
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continue;
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return arches->gdbarch;
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}
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/* Allocate space for the new architecture. */
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tdep = XMALLOC (struct gdbarch_tdep);
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gdbarch = gdbarch_alloc (&info, tdep);
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tdep->os_ident = os_ident;
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/* FIXME: kettenis/2001-11-24: Although not all IA-32 processors
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have the SSE registers, it's easier to set the default to 8. */
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tdep->num_xmm_regs = 8;
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@ -43,6 +43,9 @@
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/* i386 architecture specific information. */
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struct gdbarch_tdep
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{
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/* OS/ABI. */
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int os_ident;
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/* Number of SSE registers. */
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int num_xmm_regs;
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};
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