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Eliminate local var bss_end.

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Update the symbol values of _edata and _end.
This commit is contained in:
Richard M. Stallman 1994-08-20 00:48:16 +00:00
parent 422450b944
commit 8bf761ce6f
1 changed files with 21 additions and 3 deletions
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24
src/unexelf.c
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@ -475,7 +475,6 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
char *new_name, *old_name;
unsigned data_start, bss_start, entry_address;
{
extern unsigned int bss_end;
int new_file, old_file, new_file_size;
/* Pointers to the base of the image of the two files. */
@ -548,8 +547,7 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
#if defined(emacs) || !defined(DEBUG)
bss_end = (unsigned int) sbrk (0);
new_bss_addr = (Elf32_Addr) bss_end;
new_bss_addr = (Elf32_Addr) sbrk (0);
#else
new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
#endif
@ -771,6 +769,26 @@ unexec (new_name, old_name, data_start, bss_start, entry_address)
}
}
/* Update the symbol values of _edata and _end. */
for (n = new_file_h->e_shnum - 1; n; n--)
{
byte *symnames;
Elf32_Sym *symp, *symendp;
if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
&& NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
continue;
symnames = NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset + new_base;
symp = (Elf32_Sym *) (NEW_SECTION_H (n).sh_offset + new_base);
symendp = (Elf32_Sym *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
for (; symp < symendp; symp ++)
if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|| strcmp ((char *) (symnames + symp->st_name), "_edata") == 0)
memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
}
/* Close the files and make the new file executable */
if (close (old_file))