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dynamic linking support for powerpc

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incomplete but at least partly working. requires all files to be
compiled in the new "secure" plt model, not the old one that put plt
code in the data segment. TLS is untested but may work. invoking the
dynamic linker explicitly to load a program does not yet handle argv
correctly.
This commit is contained in:
Rich Felker 2012-11-16 22:22:34 -05:00
commit a4db94ab78
2 changed files with 43 additions and 25 deletions
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35
arch/powerpc/reloc.h
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@ -16,21 +16,40 @@ static inline void do_single_reloc(
switch(type) {
case R_PPC_GLOB_DAT:
case R_PPC_JMP_SLOT:
*reloc_addr = sym_val;
break;
case R_PPC_REL32:
if (sym_val) *reloc_addr += sym_val;
else *reloc_addr += (size_t)base_addr;
case R_PPC_ADDR32:
*reloc_addr = sym_val + addend;
break;
case R_PPC_COPY:
memcpy(reloc_addr, (void *)sym_val, sym_size);
break;
case R_PPC_RELATIVE:
*reloc_addr += (size_t)base_addr;
*reloc_addr = (size_t)base_addr + addend;
break;
//case R_PPC64_DTPMOD64: //R_X86_64_DTPMOD64:
case R_PPC_DTPMOD32: //R_386_TLS_DTPMOD32:
case R_PPC_DTPMOD32:
*reloc_addr = def.dso ? def.dso->tls_id : self->tls_id;
break;
case R_PPC_DTPREL32:
*reloc_addr = def.sym->st_value + addend;
break;
case R_PPC_TPREL32:
*reloc_addr += def.sym
? def.sym->st_value + def.dso->tls_offset - 0x7000
: self->tls_offset - 0x7000;
break;
}
}
void __reloc_self(int c, size_t *a, size_t *dynv)
{
char *base;
size_t t[20], n;
for (a+=c+1; *a; a++);
for (a++; *a; a+=2) if (*a<20) t[*a] = a[1];
base = (char *)t[AT_BASE];
if (!base) base = (char *)(t[AT_PHDR] & -4096);
for (a=dynv; *a; a+=2) if (*a<20) t[*a] = a[1];
n = t[DT_RELASZ];
for (a=(void *)(base+t[DT_RELA]); n; a+=3, n-=12)
if (a[1]%256 == R_PPC_RELATIVE)
*(size_t *)(base+a[0]) = (size_t)base + a[2];
}