/* Unexec for Siemens machines running Sinix (modified SVR4).
- Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995
- Free Software Foundation, Inc.
+ Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995, 2002,
+ 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+This file is part of GNU Emacs.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
-
/*
* unexec.c - Convert a running program into an a.out file.
*
* is made the last in the table to avoid changing any existing index.
*/
-/* 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.
/*
* New modifications for Siemens Nixdorf's MIPS-based machines.
* Marco.Walther@mch.sni.de
+ * marco@inreach.com
*
* The problem: Before the bss segment we have a so called sbss segment
* (small bss) and maybe an sdata segment. These segments
*
* /home1/marco/emacs/emacs-19.22/src
* dump -hv temacs
- *
+ *
* temacs:
*
* **** SECTION HEADER TABLE ****
* Link Info Adralgn Entsize
*
* [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
- * 0 0 0x4 0x18
+ * 0 0 0x4 0x18
*
* [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
- * 6 0 0x4 0x8
+ * 6 0 0x4 0x8
*
* [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
- * 5 0 0x4 0x4
+ * 5 0 0x4 0x4
*
* [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
- * 6 2 0x4 0x10
+ * 6 2 0x4 0x10
*
* [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
- * 5 14 0x4 0x8
+ * 5 14 0x4 0x8
*
* [8] PBIT -AI- 0x402880 0x2880 0x60 .init
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
- * 0 0 0x4 0x4
+ * 0 0 0x4 0x4
*
* [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
- * 0 0 0x20 0x1
+ * 0 0 0x20 0x1
*
* [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
- * 0 0 0x4 0x4
+ * 0 0 0x4 0x4
*
* [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss <<<<<
- * 0 0 0x4 0
+ * 0 0 0x4 0
*
* [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [19] SYMT ---- 0 0x142370 0x10e40 .symtab
- * 20 1108 0x4 0x10
+ * 20 1108 0x4 0x10
*
* [20] STRT ---- 0 0x1531b0 0xed9e .strtab
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [21] STRT ---- 0 0x161f4e 0xb5 .shstrtab
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [22] PBIT ---- 0 0x162003 0x28e2a .comment
- * 0 0 0x1 0x1
+ * 0 0 0x1 0x1
*
* [23] PBIT ---- 0 0x18ae2d 0x592 .debug
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [24] PBIT ---- 0 0x18b3bf 0x80 .line
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [25] MDBG ---- 0 0x18b440 0x60 .mdebug
- * 0 0 0x4 0
+ * 0 0 0x4 0
*
*
* dump -hv emacs
- *
+ *
* emacs:
*
* **** SECTION HEADER TABLE ****
* Link Info Adralgn Entsize
*
* [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
- * 0 0 0x4 0x18
+ * 0 0 0x4 0x18
*
* [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
- * 6 0 0x4 0x8
+ * 6 0 0x4 0x8
*
* [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
- * 5 0 0x4 0x4
+ * 5 0 0x4 0x4
*
* [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
- * 6 2 0x4 0x10
+ * 6 2 0x4 0x10
*
* [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
- * 5 14 0x4 0x8
+ * 5 14 0x4 0x8
*
* [8] PBIT -AI- 0x402880 0x2880 0x60 .init
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
- * 0 0 0x4 0x4
+ * 0 0 0x4 0x4
*
* [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
- * 0 0 0x20 0x1
+ * 0 0 0x20 0x1
*
* [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
- * 0 0 0x4 0x4
+ * 0 0 0x4 0x4
*
* [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data <<<<<
- * 0 0 0x10 0x1
+ * 0 0 0x10 0x1
*
* [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss <<<<<
- * 0 0 0x4 0
+ * 0 0 0x4 0
*
* [19] NOBI WA-- 0x617000 0x1d7000 0 .bss <<<<<
- * 0 0 0x4 0x1
+ * 0 0 0x4 0x1
*
* [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab
- * 21 1109 0x4 0x10
+ * 21 1109 0x4 0x10
*
* [21] STRT ---- 0 0x1e7e40 0xed9e .strtab
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [22] STRT ---- 0 0x1f6bde 0xb5 .shstrtab
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment
- * 0 0 0x1 0x1
+ * 0 0 0x1 0x1
*
* [24] PBIT ---- 0 0x21fabd 0x592 .debug
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [25] PBIT ---- 0 0x22004f 0x80 .line
- * 0 0 0x1 0
+ * 0 0 0x1 0
*
* [26] MDBG ---- 0 0x2200d0 0x60 .mdebug
- * 0 0 0x4 0
+ * 0 0 0x4 0
*
*/
\f
#include <fcntl.h>
#include <elf.h>
#include <sys/mman.h>
+#include <assert.h>
+
+/* #define DEBUG */
#ifndef emacs
#define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
Elf32_Addr new_data2_addr;
Elf32_Addr new_data3_addr;
+
+ Elf32_Addr old_rel_dyn_addr;
+ Elf32_Word old_rel_dyn_size;
+ int old_rel_dyn_index;
+
Elf32_Word old_sdata_size, new_sdata_size;
int old_sdata_index = 0;
{
old_sdata_index = old_sbss_index - 1;
}
-
+
/* Find the old .bss section.
*/
fatal ("Can't find .bss in %s.\n", old_name, 0);
if (old_sbss_index != (old_bss_index - 1))
- fatal (".sbss should come immediatly before .bss in %s.\n", old_name, 0);
+ fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0);
+
+ /* Find the old .rel.dyn section.
+ */
+
+ for (old_rel_dyn_index = 1; old_rel_dyn_index < old_file_h->e_shnum;
+ old_rel_dyn_index++)
+ {
+#ifdef DEBUG
+ fprintf (stderr, "Looking for .rel.dyn - found %s\n",
+ old_section_names + OLD_SECTION_H(old_rel_dyn_index).sh_name);
+#endif
+ if (!strcmp (old_section_names + OLD_SECTION_H(old_rel_dyn_index).sh_name,
+ ".rel.dyn"))
+ break;
+ }
+ if (old_rel_dyn_index == old_file_h->e_shnum)
+ fatal ("Can't find .rel_dyn in %s.\n", old_name, 0);
+
+ old_rel_dyn_addr = OLD_SECTION_H(old_rel_dyn_index).sh_addr;
+ old_rel_dyn_size = OLD_SECTION_H(old_rel_dyn_index).sh_size;
/* Figure out parameters of the new data3 and data2 sections.
* Change the sbss and bss sections.
fprintf (stderr, "old_sbss_index %d\n", old_sbss_index);
fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr);
fprintf (stderr, "old_sbss_size %x\n", old_sbss_size);
+ fprintf (stderr, "old_rel_dyn_addr %x\n", old_rel_dyn_addr);
+ fprintf (stderr, "old_rel_dyn_size %x\n", old_rel_dyn_size);
if (old_sdata_index)
{
fprintf (stderr, "old_sdata_size %x\n", old_sdata_size);
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 < old_file_h->e_shnum; n++, nn++)
{
{
memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
new_file_h->e_shentsize);
-
+
NEW_SECTION_H(nn).sh_addr = new_data3_addr;
NEW_SECTION_H(nn).sh_offset = new_data3_offset;
NEW_SECTION_H(nn).sh_size = new_data3_size;
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_data3_size);
/* the new .data2 section should also come before the
* new .sbss section */
/* We always have a .sdata section: append the contents of the
* old .sbss section.
*/
- memcpy (new_data3_offset + new_base,
- (caddr_t) OLD_SECTION_H(n).sh_addr,
+ memcpy (new_data3_offset + new_base,
+ (caddr_t) OLD_SECTION_H(n).sh_addr,
new_data3_size);
nn ++;
}
}
else if (n == old_bss_index)
-
+
/* If it is bss section, insert the new data2 section before it. */
{
Elf32_Word tmp_align;
/* 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;
NEW_SECTION_H(nn).sh_addralign = tmp_align;
/* Now copy over what we have in the memory now. */
- memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
+ memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
(caddr_t) tmp_addr, new_data2_size);
nn += 2;
}
-
- memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
+
+ memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
old_file_h->e_shentsize);
-
+
if (old_sdata_index && n == old_sdata_index)
/* The old .sdata section has now a new size */
NEW_SECTION_H(nn).sh_size = new_sdata_size;
NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align +
new_data3_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 + (old_sdata_index ? 1 : 0)).sh_addralign;
new_data3_size - old_bss_padding;
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 - (old_sdata_index ? 0 : 1))).sh_addralign;
new_data2_align +
new_data3_size -
old_bss_padding;
-
+
/* 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);
PATCH_INDEX(NEW_SECTION_H(nn).sh_info);
-
+
/* Now, start to copy the content of sections. */
if (NEW_SECTION_H(nn).sh_type == SHT_NULL
|| NEW_SECTION_H(nn).sh_type == SHT_NOBITS)
continue;
-
+
/* Write out the sections. .data, .data1 and .sdata get copied from
* the current process instead of the old file.
*/
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,
((n == old_sdata_index) ?
old_sdata_size :
{
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++)
{
|| (sym->st_shndx == SHN_ABS)
|| (sym->st_shndx == SHN_COMMON))
continue;
-
+
PATCH_INDEX(sym->st_shndx);
}
}
}
+ {
+ Elf32_Rel *rel_p;
+ unsigned int old_data_addr_start;
+ unsigned int old_data_addr_end;
+ unsigned int old_data_offset;
+ unsigned int new_data_offset;
+ int i;
+
+ rel_p = (Elf32_Rel *)OLD_SECTION_H(old_rel_dyn_index).sh_addr;
+ old_data_addr_start = OLD_SECTION_H(old_data_index).sh_addr;
+ old_data_addr_end = old_data_addr_start +
+ OLD_SECTION_H(old_data_index).sh_size;
+ old_data_offset = (int)OLD_SECTION_H(old_data_index).sh_offset +
+ (unsigned int)old_base;
+ new_data_offset = (int)NEW_SECTION_H(old_data_index).sh_offset +
+ (unsigned int)new_base;
+
+#ifdef DEBUG
+ fprintf(stderr, "old_data.sh_addr= 0x%08x ... 0x%08x\n", old_data_addr_start,
+ old_data_addr_end);
+#endif /* DEBUG */
+
+ for (i = 0; i < old_rel_dyn_size/sizeof(Elf32_Rel); i++)
+ {
+#ifdef DEBUG
+ fprintf(stderr, ".rel.dyn offset= 0x%08x type= %d sym= %d\n",
+ rel_p->r_offset, ELF32_R_TYPE(rel_p->r_info), ELF32_R_SYM(rel_p->r_info));
+#endif /* DEBUG */
+
+ if (rel_p->r_offset)
+ {
+ unsigned int offset;
+
+ assert(old_data_addr_start <= rel_p->r_offset &&
+ rel_p->r_offset <= old_data_addr_end);
+
+ offset = rel_p->r_offset - old_data_addr_start;
+
+#ifdef DEBUG
+ fprintf(stderr, "r_offset= 0x%08x *r_offset= 0x%08x\n",
+ rel_p->r_offset, *((int *)(rel_p->r_offset)));
+ fprintf(stderr, "old = 0x%08x *old =0x%08x\n",
+ (old_data_offset + offset - (unsigned int)old_base),
+ *((int *)(old_data_offset + offset)));
+ fprintf(stderr, "new = 0x%08x *new =0x%08x\n",
+ (new_data_offset + offset - (unsigned int)new_base),
+ *((int *)(new_data_offset + offset)));
+#endif /* DEBUG */
+
+ *((int *)(new_data_offset + offset)) = *((int *)(old_data_offset + offset));
+ }
+
+ rel_p++;
+ }
+ }
/* Close the files and make the new file executable */
if (chmod (new_name, stat_buf.st_mode) == -1)
fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
}
+
+/* arch-tag: c784ead3-7a27-442b-83fe-7af8d08654d3
+ (do not change this comment) */