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libbacktrace: support FDPIC

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Based on patch by Max Filippov.

	* internal.h: If FDPIC, #include <link.h> and/or <sys/link.h>.
	(libbacktrace_using_fdpic): Define.
	(struct libbacktrace_base_address): Define.
	(libbacktrace_add_base): Define.
	(backtrace_dwarf_add): Change base_address to struct
	libbacktrace_base_address.
	* dwarf.c (struct dwarf_data): Change base_address to struct
	libbacktrace_base_address.
	(add_ranges, find_address_ranges, build_ddress_map): Likewise.
	(build_dwarf_data, build_dwarf_add): Likewise.
	(add_low_high_range): Change base_address to struct
	libbacktrace_base_address.  Use libbacktrace_add_base.
	(add_ranges_from_ranges, add_ranges_from_rnglists): Likewise.
	(add_line): Use libbacktrace_add_base.
	* elf.c (elf_initialize_syminfo): Change base_address to struct
	libbacktrace_base_address.  Use libbacktrace_add_base.
	(elf_add): Change base_address to struct
	libbacktrace_base_address.
	(phdr_callback): Likewise.  Initialize base_address.m.
	(backtrace_initialize): If using FDPIC, don't call elf_add with
	main executable; always use dl_iterate_phdr.
	* macho.c (macho_add_symtab): Change base_address to struct
	libbacktrace_base_address.  Use libbacktrace_add_base.
	(macho_syminfo): Change base_address to struct
	libbacktrace_base_address.
	(macho_add_fat, macho_add_dsym, macho_add): Likewise.
	(backtrace_initialize): Likewise.  Initialize base_address.m.
	* pecoff.c (coff_initialize_syminfo): Change base_address to
	struct libbacktrace_base_address.  Use libbacktrace_add_base.
	(coff_add): Change base_address to struct
	libbacktrace_base_address.  Initialize base_address.m.
This commit is contained in:
Ian Lance Taylor
2024-07-15 17:27:18 -07:00
parent febbb9bff9
commit 1dd5c408fe
5 changed files with 123 additions and 62 deletions
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36
internal.h
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@@ -323,10 +323,44 @@ struct dwarf_sections
struct dwarf_data;
/* The load address mapping. */
#if defined(__FDPIC__) && defined(HAVE_DL_ITERATE_PHDR) && (defined(HAVE_LINK_H) || defined(HAVE_SYS_LINK_H))
#ifdef HAVE_LINK_H
#include <link.h>
#endif
#ifdef HAVE_SYS_LINK_H
#include <sys/link.h>
#endif
#define libbacktrace_using_fdpic() (1)
struct libbacktrace_base_address
{
struct elf32_fdpic_loadaddr m;
};
#define libbacktrace_add_base(pc, base) \
((uintptr_t) (__RELOC_POINTER ((pc), (base).m)))
#else /* not _FDPIC__ */
#define libbacktrace_using_fdpic() (0)
struct libbacktrace_base_address
{
uintptr_t m;
};
#define libbacktrace_add_base(pc, base) ((pc) + (base).m)
#endif /* not _FDPIC__ */
/* Add file/line information for a DWARF module. */
extern int backtrace_dwarf_add (struct backtrace_state *state,
uintptr_t base_address,
struct libbacktrace_base_address base_address,
const struct dwarf_sections *dwarf_sections,
int is_bigendian,
struct dwarf_data *fileline_altlink,