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authorEric Andersen <andersen@codepoet.org>2004-01-29 10:48:05 +0000
committerEric Andersen <andersen@codepoet.org>2004-01-29 10:48:05 +0000
commit8e5b520d884b4793f69415b303d6f4447a7521c2 (patch)
treeebb40ef9ee20c11fd8c47d1faa0ed65930815db0 /ldso
parent3312c6ac985f422a529cf91cfae035f5a3556f8e (diff)
Joakim Tjernlund writes:
Here is the cleaned up laze reloc patch. Summary: - Minor cleanup. - disable the "if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000)" test since it almost never triggered. - Optimized the lazy relocs handling. Would be great if you could commit ASAP. Jocke
Diffstat (limited to 'ldso')
-rw-r--r--ldso/ldso/powerpc/elfinterp.c96
1 files changed, 46 insertions, 50 deletions
diff --git a/ldso/ldso/powerpc/elfinterp.c b/ldso/ldso/powerpc/elfinterp.c
index 3e2272aca..eec78e305 100644
--- a/ldso/ldso/powerpc/elfinterp.c
+++ b/ldso/ldso/powerpc/elfinterp.c
@@ -112,16 +112,9 @@ void _dl_init_got(unsigned long *plt,struct elf_resolve *tpnt)
Elf32_Word rel_offset_words;
Elf32_Word dlrr = (Elf32_Word) _dl_linux_resolve;
- //DPRINTF("init_got plt=%x, tpnt=%x\n", (unsigned long)plt,(unsigned long)tpnt);
-
num_plt_entries = tpnt->dynamic_info[DT_PLTRELSZ] / sizeof(ELF_RELOC);
- //DPRINTF("n_plt_entries %d\n",n_plt_entries);
-
rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
- //DPRINTF("rel_offset_words %x\n",rel_offset_words);
data_words = (Elf32_Word) (plt + rel_offset_words);
- //DPRINTF("data_words %x\n",data_words);
-
tpnt->data_words = data_words;
plt[PLT_LONGBRANCH_ENTRY_WORDS] = OPCODE_ADDIS_HI(11, 11, data_words);
@@ -146,10 +139,10 @@ void _dl_init_got(unsigned long *plt,struct elf_resolve *tpnt)
tramp[4] = OPCODE_LI (12, (Elf32_Word) tpnt);
tramp[5] = OPCODE_ADDIS_HI (12, 12, (Elf32_Word) tpnt);
- /* Call _dl_runtime_resolve. */
+ /* Call _dl_linux_resolve . */
tramp[6] = OPCODE_BA (dlrr);
} else {
- /* Get address of _dl_runtime_resolve in CTR. */
+ /* Get address of _dl_linux_resolve in CTR. */
tramp[4] = OPCODE_LI(12,dlrr);
tramp[5] = OPCODE_ADDIS_HI(12,12,dlrr);
tramp[6] = OPCODE_MTCTR(12);
@@ -158,7 +151,7 @@ void _dl_init_got(unsigned long *plt,struct elf_resolve *tpnt)
tramp[7] = OPCODE_LI(12,(Elf32_Word) tpnt);
tramp[8] = OPCODE_ADDIS_HI(12,12,(Elf32_Word) tpnt);
- /* Call _dl_runtime_resolve. */
+ /* Call _dl_linux_resolve. */
tramp[9] = OPCODE_BCTR();
}
/* [16] unused */
@@ -229,8 +222,11 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
delta = finaladdr - (Elf32_Word)reloc_addr;
if (delta<<6>>6 == delta) {
*reloc_addr = OPCODE_B(delta);
+#if 0
+ /* this will almost never be true */
} else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000) {
*reloc_addr = OPCODE_BA (finaladdr);
+#endif
} else {
/* Warning: we don't handle double-sized PLT entries */
Elf32_Word *plt, *data_words, index, offset;
@@ -321,45 +317,6 @@ _dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
}
static int
-_dl_do_lazy_reloc (struct elf_resolve *tpnt, struct dyn_elf *scope,
- ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
-{
- Elf32_Addr *reloc_addr;
- Elf32_Word *plt, index, offset;
-
- (void)scope;
- (void)symtab;
- (void)strtab;
-
- reloc_addr = (Elf32_Addr *)(tpnt->loadaddr + rpnt->r_offset);
-#if defined (__SUPPORT_LD_DEBUG__)
- if (ELF32_R_TYPE(rpnt->r_info) != R_PPC_JMP_SLOT) {
- _dl_dprintf(2, "Reloc type != R_PPC_JMP_SLOT. Type is 0x%x\n", ELF32_R_TYPE(rpnt->r_info));
- return -1;
- }
-#endif
- plt = (Elf32_Word *)(tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
- offset = reloc_addr - plt;
- index = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
- reloc_addr[0] = OPCODE_LI(11,index*4);
- reloc_addr[1] = OPCODE_B((PLT_TRAMPOLINE_ENTRY_WORDS + 2 - (offset+1)) * 4);
-
- /* instructions were modified */
- PPC_DCBST(reloc_addr);
- PPC_DCBST(reloc_addr+1);
- PPC_SYNC;
- PPC_ICBI(reloc_addr);
- PPC_ICBI(reloc_addr+1);
- PPC_ISYNC;
-
-#if defined (__SUPPORT_LD_DEBUG__)
- if(_dl_debug_reloc && _dl_debug_detail)
- _dl_dprintf(_dl_debug_file, "\tpatched: %x", reloc_addr);
-#endif
- return 0;
-}
-
-static int
_dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
ELF_RELOC *rpnt, Elf32_Sym *symtab, char *strtab)
{
@@ -415,8 +372,11 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
if (delta<<6>>6 == delta) {
*reloc_addr = OPCODE_B(delta);
+#if 0
+ /* this will almost never be true */
} else if (finaladdr <= 0x01fffffc || finaladdr >= 0xfe000000) {
*reloc_addr = OPCODE_BA (finaladdr);
+#endif
} else {
/* Warning: we don't handle double-sized PLT entries */
Elf32_Word *plt, *data_words, index, offset;
@@ -537,8 +497,44 @@ _dl_do_copy (struct elf_resolve *tpnt, struct dyn_elf *scope,
void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
unsigned long rel_addr, unsigned long rel_size, int type)
{
+ Elf32_Word *plt, offset, i, num_plt_entries, rel_offset_words;
+
(void) type;
- (void)_dl_parse(tpnt, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+ num_plt_entries = rel_size / sizeof(ELF_RELOC);
+
+ /* When the dynamic linker bootstrapped itself, it resolved some symbols.
+ Make sure we do not do them again */
+ if (tpnt->libtype == program_interpreter)
+ return;
+ rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
+ plt = (Elf32_Word *)(tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
+
+ /* Set up the lazy PLT entries. */
+ offset = PLT_INITIAL_ENTRY_WORDS;
+ i = 0;
+ /* Warning: we don't handle double-sized PLT entries */
+ while (i < num_plt_entries) {
+ plt[offset ] = OPCODE_LI(11, i * 4);
+ plt[offset+1] = OPCODE_B((PLT_TRAMPOLINE_ENTRY_WORDS + 2 - (offset+1)) * 4);
+ i++;
+ offset += 2;
+ }
+ /* Now, we've modified code. We need to write the changes from
+ the data cache to a second-level unified cache, then make
+ sure that stale data in the instruction cache is removed.
+ (In a multiprocessor system, the effect is more complex.)
+ Most of the PLT shouldn't be in the instruction cache, but
+ there may be a little overlap at the start and the end.
+
+ Assumes that dcbst and icbi apply to lines of 16 bytes or
+ more. Current known line sizes are 16, 32, and 128 bytes. */
+ for (i = 0; i < rel_offset_words; i += 4)
+ PPC_DCBST (plt + i);
+ PPC_DCBST (plt + rel_offset_words - 1);
+ PPC_SYNC;
+ PPC_ICBI (plt);
+ PPC_ICBI (plt + rel_offset_words - 1);
+ PPC_ISYNC;
}
int _dl_parse_relocation_information(struct elf_resolve *tpnt,