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64 bit support for MIPS rtld.

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- Handle the case where pltgot[1] is 64 bit.
- use 'ifdef __mips_n64' instead of 'ELFSIZE == 64' to detect 64 bit compile.
This commit is contained in:
Jayachandran C. 2010-07-29 20:18:52 +00:00
parent 3d3063c0b3
commit 4c4a1ce8f8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=210629
2 changed files with 17 additions and 10 deletions
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22
libexec/rtld-elf/mips/reloc.c
View File

@ -41,13 +41,19 @@ __FBSDID("$FreeBSD$");
#include "debug.h"
#include "rtld.h"
#ifdef __mips_n64
#define GOT1_MASK 0x8000000000000000UL
#else
#define GOT1_MASK 0x80000000UL
#endif
void
init_pltgot(Obj_Entry *obj)
{
if (obj->pltgot != NULL) {
obj->pltgot[0] = (Elf_Addr) &_rtld_bind_start;
/* XXX only if obj->pltgot[1] & 0x80000000 ?? */
obj->pltgot[1] |= (Elf_Addr) obj;
if (obj->pltgot[1] & 0x80000000)
obj->pltgot[1] = (Elf_Addr) obj | GOT1_MASK;
}
}
@ -64,7 +70,7 @@ void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
* It is possible for the compiler to emit relocations for unaligned data.
* We handle this situation with these inlines.
*/
#if ELFSIZE == 64
#ifdef __mips_n64
/*
* ELF64 MIPS encodes the relocs uniquely. The first 32-bits of info contain
* the symbol index. The top 32-bits contain three relocation types encoded
@ -90,7 +96,7 @@ load_ptr(void *where, size_t len)
Elf_Sxword val;
if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
#if ELFSIZE == 64
#ifdef __mips_n64
if (len == sizeof(Elf_Sxword))
return *(Elf_Sxword *)where;
#endif
@ -111,7 +117,7 @@ static __inline void
store_ptr(void *where, Elf_Sxword val, size_t len)
{
if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
#if ELFSIZE == 64
#ifdef __mips_n64
if (len == sizeof(Elf_Sxword)) {
*(Elf_Sxword *)where = val;
return;
@ -165,7 +171,7 @@ _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
}
}
i = (got[1] & 0x80000000) ? 2 : 1;
i = (got[1] & GOT1_MASK) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;
for (; i < local_gotno; i++) {
@ -197,7 +203,7 @@ _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
: sizeof(Elf_Sword);
Elf_Sxword old = load_ptr(where, rlen);
Elf_Sxword val = old;
#if ELFSIZE == 64
#ifdef __mips_n64
assert(r_type == R_TYPE(REL32)
|| r_type == (R_TYPE(REL32)|(R_TYPE(64) << 8)));
#endif
@ -272,7 +278,7 @@ reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld)
dbg("%s: broken=%d", obj->path, broken);
#endif
i = (got[1] & 0x80000000) ? 2 : 1;
i = (got[1] & GOT1_MASK) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;

5
libexec/rtld-elf/mips/rtld_start.S
View File

@ -130,11 +130,12 @@ _rtld_bind_start:
/* .got = $gp - 0x7ff0 */
/* Simple math as you can see. */
#if defined(__mips_n64)
ld a0, 8(a0) /* object = pltgot[1] & 0x7fffffff */
ld a0, 8(a0) /* object = pltgot[1] */
and a0, a0, 0x7fffffffffffffff
#else
lw a0, 4(a0) /* object = pltgot[1] & 0x7fffffff */
#endif
and a0, a0, 0x7fffffff
#endif
move a1, t8 /* symbol index */
PTR_LA t9, _C_LABEL(_mips_rtld_bind)