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Spend some bytes of code in stub to eliminate wasted stack space.

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(Choose between this revision and previous, according to taste.)
	fold_elf86.asm l_lx_elf.c

committer: jreiser <jreiser> 994887023 +0000
This commit is contained in:
John Reiser
2001-07-11 21:30:23 +00:00
parent ef17dc10ca
commit 96141d82f4
2 changed files with 82 additions and 43 deletions
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src/stub/l_lx_elf.c
+19 -7
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@@ -212,6 +212,18 @@ bzero(char *p, size_t len)
}
static void
auxv_up(Elf32_auxv_t *av, int const type, unsigned const value)
{
for (;; ++av) {
if (av->a_type==type || av->a_type==AT_IGNORE) {
av->a_type = type;
av->a_un.a_val = value;
return;
}
}
}
static Elf32_Addr // entry address
do_xmap(int const fdi, Elf32_Ehdr const *const ehdr, struct Extent *const xi,
Elf32_auxv_t *const av)
@@ -222,7 +234,7 @@ do_xmap(int const fdi, Elf32_Ehdr const *const ehdr, struct Extent *const xi,
int j;
for (j=0; j < ehdr->e_phnum; ++phdr, ++j)
if (PT_PHDR==phdr->p_type) {
av[AT_PHDR -1].a_un.a_val = phdr->p_vaddr;
auxv_up(av, AT_PHDR, phdr->p_vaddr);
}
else if (PT_LOAD==phdr->p_type) {
struct Extent xo;
@@ -346,12 +358,12 @@ void *upx_main(
xi.buf -= sz_pckhdrs;
xi.size = sz_compressed;
// av[AT_PHDR -1].a_un.a_val is set again by do_xmap if PT_PHDR is present.
av[AT_PHDR -1].a_type = AT_PHDR ; av[AT_PHDR -1].a_un.a_ptr = 1+(Elf32_Ehdr *)phdr->p_vaddr;
av[AT_PHENT -1].a_type = AT_PHENT ; av[AT_PHENT -1].a_un.a_val = ehdr->e_phentsize;
av[AT_PHNUM -1].a_type = AT_PHNUM ; av[AT_PHNUM -1].a_un.a_val = ehdr->e_phnum;
av[AT_PAGESZ -1].a_type = AT_PAGESZ; av[AT_PAGESZ -1].a_un.a_val = PAGE_SIZE;
av[AT_ENTRY -1].a_type = AT_ENTRY ; av[AT_ENTRY -1].a_un.a_val = ehdr->e_entry;
// AT_PHDR.a_un.a_val is set again by do_xmap if PT_PHDR is present.
auxv_up(av, AT_PHDR , (unsigned)(1+(Elf32_Ehdr *)phdr->p_vaddr));
auxv_up(av, AT_PHENT , ehdr->e_phentsize);
auxv_up(av, AT_PHNUM , ehdr->e_phnum);
//auxv_up(av, AT_PAGESZ, PAGE_SIZE); /* ld-linux.so.2 does not need this */
auxv_up(av, AT_ENTRY , (unsigned)ehdr->e_entry);
entry = do_xmap((int)f_decompress, ehdr, &xi, av);
{ // Map PT_INTERP program interpreter