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| author | H.J. Lu <hjl.tools@gmail.com> | 2024-03-01 06:14:20 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2024-04-03 09:11:03 -0700 |
| commit | 584b30e4b3538a64d38bc1da9cfa09fc9355378a (patch) | |
| tree | c5d9e8cd2d6dbc695737abb77a523e86e7e411d7 /bfd/section.c | |
| parent | 9ba56acee518492cfe21434b974c807f52ac7950 (diff) | |
| download | gdb-584b30e4b3538a64d38bc1da9cfa09fc9355378a.zip gdb-584b30e4b3538a64d38bc1da9cfa09fc9355378a.tar.gz gdb-584b30e4b3538a64d38bc1da9cfa09fc9355378a.tar.bz2 | |
elf: Add _bfd_elf_m[un]map_section_contents
Add _bfd_elf_mmap_section_contents and _bfd_elf_munmap_section_contents.
A backend must opt-in to use mmap. It should replace
bfd_malloc_and_get_section -> _bfd_elf_mmap_section_contents
free -> _bfd_elf_munmap_section_contents
on section contents.
* compress.c (bfd_get_full_section_contents): Don't allocate
buffer if mmapped_p is true.
* elf-bfd.h (elf_backend_data): Add use_mmap.
(bfd_elf_section_data): Add contents_addr and contents_size.
(_bfd_elf_mmap_section_contents): New.
(_bfd_elf_munmap_section_contents): Likewise.
* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Replace
bfd_malloc_and_get_section and free with
_bfd_elf_mmap_section_contents and _bfd_elf_munmap_section_contents
on section contents.
* elf-sframe.c (_bfd_elf_parse_sframe): Likewise.
* elf.c (_bfd_elf_make_section_from_shdr): Replace
bfd_malloc_and_get_section and free with
_bfd_elf_mmap_section_contents and _bfd_elf_munmap_section_contents
on section contents.
(_bfd_elf_print_private_bfd_data): Likewise.
(_bfd_elf_mmap_section_contents): New.
(_bfd_elf_munmap_section_contents): Likewise.
* elf32-i386.c (elf_i386_scan_relocs): Replace
bfd_malloc_and_get_section and free with
_bfd_elf_mmap_section_contents and _bfd_elf_munmap_section_contents
on section contents.
* elf64-x86-64.c (elf_x86_64_scan_relocs): Likewise.
(elf_x86_64_get_synthetic_symtab): Likewise.
* elfcode.h (elf_checksum_contents): Likewise.
* elflink.c (elf_link_add_object_symbols): Likewise.
(bfd_elf_get_bfd_needed_list): Likewise.
* elfxx-target.h (elf_backend_use_mmap): New.
(elfNN_bed): Add elf_backend_use_mmap.
* elfxx-x86.c (elf_x86_size_or_finish_relative_reloc): Replace
bfd_malloc_and_get_section and free with
_bfd_elf_mmap_section_contents and _bfd_elf_munmap_section_contents
on section contents.
(_bfd_x86_elf_get_synthetic_symtab): Replace free with
_bfd_elf_munmap_section_contents.
* elfxx-x86.h (elf_backend_use_mmap): New.
* libbfd.c: Include "elf-bfd.h".
(_bfd_generic_get_section_contents): Call bfd_mmap_local for
mmapped_p.
* opncls.c (_bfd_delete_bfd): Also munmap ELF section contents.
* section.c (asection): Add mmapped_p.
(BFD_FAKE_SECTION): Updated.
(bfd_malloc_and_get_section): Add a sanity check for not
mmapped_p.
* bfd-in2.h: Regenerated.
Diffstat (limited to 'bfd/section.c')
| -rw-r--r-- | bfd/section.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/bfd/section.c b/bfd/section.c index 4eaa460..778a6f7 100644 --- a/bfd/section.c +++ b/bfd/section.c @@ -422,6 +422,9 @@ CODE_FRAGMENT . {* Nonzero if this section uses RELA relocations, rather than REL. *} . unsigned int use_rela_p:1; . +. {* Nonzero if this section contents are mmapped, rather than malloced. *} +. unsigned int mmapped_p:1; +. . {* Bits used by various backends. The generic code doesn't touch . these fields. *} . @@ -711,8 +714,8 @@ EXTERNAL . {* linker_mark, linker_has_input, gc_mark, decompress_status, *} \ . 0, 0, 1, 0, \ . \ -. {* segment_mark, sec_info_type, use_rela_p, *} \ -. 0, 0, 0, \ +. {* segment_mark, sec_info_type, use_rela_p, mmapped_p, *} \ +. 0, 0, 0, 0, \ . \ . {* sec_flg0, sec_flg1, sec_flg2, sec_flg3, sec_flg4, sec_flg5, *} \ . 0, 0, 0, 0, 0, 0, \ @@ -1625,6 +1628,8 @@ DESCRIPTION bool bfd_malloc_and_get_section (bfd *abfd, sec_ptr sec, bfd_byte **buf) { + if (sec->mmapped_p) + abort (); *buf = NULL; return bfd_get_full_section_contents (abfd, sec, buf); } |