diff options
| author | Roland McGrath <roland@gnu.org> | 1996-01-21 04:16:54 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 1996-01-21 04:16:54 +0000 |
| commit | 7116330d04986be5dc3a1f36f150964c1d6af019 (patch) | |
| tree | bd9d57eaa79954640d4879fbf2aa92ce5982f724 /src | |
| parent | 98894f01dc7526525557eddad4442616bd7e75ca (diff) | |
| download | emacs-7116330d04986be5dc3a1f36f150964c1d6af019.tar.gz | |
(unexec): Undo data relocations unconditionally, not #ifdef SOLARIS2.
Diffstat (limited to 'src')
| -rw-r--r-- | src/unexelf.c | 220 |
1 files changed, 109 insertions, 111 deletions
diff --git a/src/unexelf.c b/src/unexelf.c index 9d102935441..ffe159744a6 100644 --- a/src/unexelf.c +++ b/src/unexelf.c @@ -101,64 +101,64 @@ temacs: Link Info Adralgn Entsize [1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 + 0 0 0x1 0 [2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 + 3 0 0x4 0x4 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 + 4 1 0x4 0x10 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 + 0 0 0x1 0 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 + 3 7 0x4 0x8 [6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 + 0 0 0x4 0 [7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 + 0 0 0x4 0x4 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 + 0 0 0x4 0 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 + 0 0 0x4 0 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 + 0 0 0x4 0 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 + 0 0 0x4 0 [12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 + 0 0 0x4 0 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 + 0 0 0x4 0 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 + 0 0 0x4 0x4 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 + 4 0 0x4 0x8 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss - 0 0 0x4 0 + 0 0 0x4 0 [17] 2 0 0 0x608f4 0x9b90 .symtab - 18 371 0x4 0x10 + 18 371 0x4 0x10 [18] 3 0 0 0x6a484 0x8526 .strtab - 0 0 0x1 0 + 0 0 0x1 0 [19] 3 0 0 0x729aa 0x93 .shstrtab - 0 0 0x1 0 + 0 0 0x1 0 [20] 1 0 0 0x72a3d 0x68b7 .comment - 0 0 0x1 0 + 0 0 0x1 0 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs @@ -169,67 +169,67 @@ xemacs: Link Info Adralgn Entsize [1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 + 0 0 0x1 0 [2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 + 3 0 0x4 0x4 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 + 4 1 0x4 0x10 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 + 0 0 0x1 0 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 + 3 7 0x4 0x8 [6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 + 0 0 0x4 0 [7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 + 0 0 0x4 0x4 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 + 0 0 0x4 0 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 + 0 0 0x4 0 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 + 0 0 0x4 0 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 + 0 0 0x4 0 [12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 + 0 0 0x4 0 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 + 0 0 0x4 0 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 + 0 0 0x4 0x4 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 + 4 0 0x4 0x8 [16] 8 3 0x80c6800 0x7d800 0 .bss - 0 0 0x4 0 + 0 0 0x4 0 [17] 2 0 0 0x7d800 0x9b90 .symtab - 18 371 0x4 0x10 + 18 371 0x4 0x10 [18] 3 0 0 0x87390 0x8526 .strtab - 0 0 0x1 0 + 0 0 0x1 0 [19] 3 0 0 0x8f8b6 0x93 .shstrtab - 0 0 0x1 0 + 0 0 0x1 0 [20] 1 0 0 0x8f949 0x68b7 .comment - 0 0 0x1 0 + 0 0 0x1 0 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data - 0 0 0x4 0 + 0 0 0x4 0 * This is an example of how the file header is changed. "Shoff" is * the section header offset within the file. Since that table is @@ -279,20 +279,20 @@ temacs: Type Offset Vaddr Paddr Filesz Memsz Flags Align -6 0x34 0x8048034 0 -0xa0 0xa0 5 0 +6 0x34 0x8048034 0 +0xa0 0xa0 5 0 -3 0xd4 0 0 -0x13 0 4 0 +3 0xd4 0 0 +0x13 0 4 0 -1 0x34 0x8048034 0 -0x3f2f9 0x3f2f9 5 0x1000 +1 0x34 0x8048034 0 +0x3f2f9 0x3f2f9 5 0x1000 -1 0x3f330 0x8088330 0 -0x215c4 0x25a60 7 0x1000 +1 0x3f330 0x8088330 0 +0x215c4 0x25a60 7 0x1000 -2 0x60874 0x80a9874 0 -0x80 0 7 0 +2 0x60874 0x80a9874 0 +0x80 0 7 0 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs @@ -301,42 +301,42 @@ xemacs: Type Offset Vaddr Paddr Filesz Memsz Flags Align -6 0x34 0x8048034 0 -0xa0 0xa0 5 0 +6 0x34 0x8048034 0 +0xa0 0xa0 5 0 -3 0xd4 0 0 -0x13 0 4 0 +3 0xd4 0 0 +0x13 0 4 0 -1 0x34 0x8048034 0 -0x3f2f9 0x3f2f9 5 0x1000 +1 0x34 0x8048034 0 +0x3f2f9 0x3f2f9 5 0x1000 -1 0x3f330 0x8088330 0 -0x3e4d0 0x3e4d0 7 0x1000 +1 0x3f330 0x8088330 0 +0x3e4d0 0x3e4d0 7 0x1000 -2 0x60874 0x80a9874 0 -0x80 0 7 0 +2 0x60874 0x80a9874 0 +0x80 0 7 0 */ -/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. - * +/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. + * * The above mechanism does not work if the unexeced ELF file is being - * re-layout by other applications (such as `strip'). All the applications + * re-layout by other applications (such as `strip'). All the applications * that re-layout the internal of ELF will layout all sections in ascending - * order of their file offsets. After the re-layout, the data2 section will - * still be the LAST section in the section header vector, but its file offset + * order of their file offsets. After the re-layout, the data2 section will + * still be the LAST section in the section header vector, but its file offset * is now being pushed far away down, and causes part of it not to be mapped - * in (ie. not covered by the load segment entry in PHDR vector), therefore + * in (ie. not covered by the load segment entry in PHDR vector), therefore * causes the new binary to fail. * * The solution is to modify the unexec algorithm to insert the new data2 * section header right before the new bss section header, so their file - * offsets will be in the ascending order. Since some of the section's (all - * sections AFTER the bss section) indexes are now changed, we also need to - * modify some fields to make them point to the right sections. This is done + * offsets will be in the ascending order. Since some of the section's (all + * sections AFTER the bss section) indexes are now changed, we also need to + * modify some fields to make them point to the right sections. This is done * by macro PATCH_INDEX. All the fields that need to be patched are: - * + * * 1. ELF header e_shstrndx field. * 2. section header sh_link and sh_info field. * 3. symbol table entry st_shndx field. @@ -348,67 +348,67 @@ Filesz Memsz Flags Align Link Info Adralgn Entsize [1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 + 0 0 0x1 0 [2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 + 3 0 0x4 0x4 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 + 4 1 0x4 0x10 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 + 0 0 0x1 0 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 + 3 7 0x4 0x8 [6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 + 0 0 0x4 0 [7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 + 0 0 0x4 0x4 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 + 0 0 0x4 0 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 + 0 0 0x4 0 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 + 0 0 0x4 0 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 + 0 0 0x4 0 [12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 + 0 0 0x4 0 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 + 0 0 0x4 0 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 + 0 0 0x4 0x4 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 + 4 0 0x4 0x8 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data - 0 0 0x4 0 + 0 0 0x4 0 [17] 8 3 0x80c6800 0x7d800 0 .bss - 0 0 0x4 0 + 0 0 0x4 0 [18] 2 0 0 0x7d800 0x9b90 .symtab - 19 371 0x4 0x10 + 19 371 0x4 0x10 [19] 3 0 0 0x87390 0x8526 .strtab - 0 0 0x1 0 + 0 0 0x1 0 [20] 3 0 0 0x8f8b6 0x93 .shstrtab - 0 0 0x1 0 + 0 0 0x1 0 [21] 1 0 0 0x8f949 0x68b7 .comment - 0 0 0x1 0 + 0 0 0x1 0 */ @@ -684,7 +684,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) if (old_data_index == old_file_h->e_shnum) fatal ("Can't find .data in %s.\n", old_name, 0); - /* Walk through all section headers, insert the new data2 section right + /* Walk through all section headers, insert the new data2 section right before the new bss section. */ for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) { @@ -695,7 +695,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) /* Steal the data section header for this data2 section. */ memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), new_file_h->e_shentsize); - + NEW_SECTION_H (nn).sh_addr = new_data2_addr; NEW_SECTION_H (nn).sh_offset = new_data2_offset; NEW_SECTION_H (nn).sh_size = new_data2_size; @@ -705,15 +705,15 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; /* Now copy over what we have in the memory now. */ - memcpy (NEW_SECTION_H (nn).sh_offset + new_base, - (caddr_t) OLD_SECTION_H (n).sh_addr, + memcpy (NEW_SECTION_H (nn).sh_offset + new_base, + (caddr_t) OLD_SECTION_H (n).sh_addr, new_data2_size); nn++; } - - memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), + + memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), old_file_h->e_shentsize); - + /* The new bss section's size is zero, and its file offset and virtual address should be off by NEW_DATA2_SIZE. */ if (n == old_bss_index) @@ -722,7 +722,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) NEW_SECTION_H (nn).sh_offset += new_data2_size; NEW_SECTION_H (nn).sh_addr += new_data2_size; /* Let the new bss section address alignment be the same as the - section address alignment followed the old bss section, so + section address alignment followed the old bss section, so this section will be placed in exactly the same place. */ NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; NEW_SECTION_H (nn).sh_size = 0; @@ -741,9 +741,9 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) } /* If any section hdr refers to the section after the new .data - section, make it refer to next one because we have inserted + section, make it refer to next one because we have inserted a new section in between. */ - + PATCH_INDEX (NEW_SECTION_H (nn).sh_link); /* For symbol tables, info is a symbol table index, so don't change it. */ @@ -755,7 +755,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) if (NEW_SECTION_H (nn).sh_type == SHT_NULL || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) continue; - + /* Write out the sections. .data and .data1 (and data2, called ".data" in the strings table) get copied from the current process instead of the old file. */ @@ -765,7 +765,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) src = (caddr_t) OLD_SECTION_H (n).sh_addr; else src = old_base + OLD_SECTION_H (n).sh_offset; - + memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, NEW_SECTION_H (nn).sh_size); @@ -775,7 +775,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) { Elf32_Shdr *spt = &NEW_SECTION_H (nn); unsigned int num = spt->sh_size / spt->sh_entsize; - Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H (nn).sh_offset + + Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H (nn).sh_offset + new_base); for (; num--; sym++) { @@ -783,7 +783,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) || (sym->st_shndx == SHN_ABS) || (sym->st_shndx == SHN_COMMON)) continue; - + PATCH_INDEX (sym->st_shndx); } } @@ -810,7 +810,6 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); } -#ifdef SOLARIS2 /* This loop seeks out relocation sections for the data section, so that it can undo relocations performed by the runtime linker. */ for (n = new_file_h->e_shnum - 1; n; n--) @@ -821,9 +820,9 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) break; case SHT_REL: case SHT_RELA: - /* This code handles two different size structs, but there - should be no harm in that provided that r_offset is always - the first member. */ + /* This code handles two different size structs, but there should + be no harm in that provided that r_offset is always the first + member. */ nn = section.sh_info; if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), @@ -842,7 +841,6 @@ unexec (new_name, old_name, data_start, bss_start, entry_address) break; } } -#endif #ifdef UNEXEC_USE_MAP_PRIVATE if (lseek (new_file, 0, SEEK_SET) == -1) |