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-rw-r--r--ldso/ldso/powerpc/dl-startup.h7
-rw-r--r--ldso/ldso/powerpc/dl-sysdep.h52
-rw-r--r--ldso/ldso/powerpc/elfinterp.c113
3 files changed, 114 insertions, 58 deletions
diff --git a/ldso/ldso/powerpc/dl-startup.h b/ldso/ldso/powerpc/dl-startup.h
index becfa191e..a5a8a83f2 100644
--- a/ldso/ldso/powerpc/dl-startup.h
+++ b/ldso/ldso/powerpc/dl-startup.h
@@ -16,8 +16,15 @@ asm(
" bl _dl_start@local\n" /* Perform relocation */
/* Save the address of the apps entry point in CTR register */
" mtctr 3\n" /* application entry point */
+#ifdef HAVE_ASM_PPC_REL16
+ " bcl 20,31,1f\n"
+ "1: mflr 31\n"
+ " addis 31,31,_GLOBAL_OFFSET_TABLE_-1b@ha\n"
+ " addi 31,31,_GLOBAL_OFFSET_TABLE_-1b@l\n"
+#else
" bl _GLOBAL_OFFSET_TABLE_-4@local\n" /* Put our GOT pointer in r31, */
" mflr 31\n"
+#endif
" addi 1,1,16\n" /* Restore SP */
" lwz 7,_dl_skip_args@got(31)\n" /* load EA of _dl_skip_args */
" lwz 7,0(7)\n" /* Load word from _dl_skip_args */
diff --git a/ldso/ldso/powerpc/dl-sysdep.h b/ldso/ldso/powerpc/dl-sysdep.h
index a06aa8aff..44f9c955c 100644
--- a/ldso/ldso/powerpc/dl-sysdep.h
+++ b/ldso/ldso/powerpc/dl-sysdep.h
@@ -89,23 +89,38 @@ void _dl_init_got(unsigned long *lpnt,struct elf_resolve *tpnt);
DT_RELA table. */
#define ELF_MACHINE_PLTREL_OVERLAP 1
+/* Return the value of the GOT pointer. */
+static inline Elf32_Addr * __attribute__ ((const))
+ppc_got (void)
+{
+ Elf32_Addr *got;
+#ifdef HAVE_ASM_PPC_REL16
+ asm (" bcl 20,31,1f\n"
+ "1:mflr %0\n"
+ " addis %0,%0,_GLOBAL_OFFSET_TABLE_-1b@ha\n"
+ " addi %0,%0,_GLOBAL_OFFSET_TABLE_-1b@l\n"
+ : "=b" (got) : : "lr");
+#else
+ asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
+ : "=l" (got));
+#endif
+ return got;
+}
+
/* Return the link-time address of _DYNAMIC, stored as
the first value in the GOT. */
-static inline Elf32_Addr
+static inline Elf32_Addr __attribute__ ((const))
elf_machine_dynamic (void)
{
- Elf32_Addr *got;
- asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
- : "=l"(got));
- return *got;
+ return *ppc_got();
}
/* Return the run-time load address of the shared object. */
-static inline Elf32_Addr
+static inline Elf32_Addr __attribute__ ((const))
elf_machine_load_address (void)
{
- unsigned int *got;
- unsigned int *branchaddr;
+ Elf32_Addr *branchaddr;
+ Elf32_Addr runtime_dynamic;
/* This is much harder than you'd expect. Possibly I'm missing something.
The 'obvious' way:
@@ -136,19 +151,17 @@ elf_machine_load_address (void)
the address ourselves. That gives us the following code: */
/* Get address of the 'b _DYNAMIC@local'... */
- asm ("bl 0f ;"
+ asm ("bcl 20,31,0f;"
"b _DYNAMIC@local;"
"0:"
: "=l"(branchaddr));
- /* ... and the address of the GOT. */
- asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
- : "=l"(got));
-
/* So now work out the difference between where the branch actually points,
and the offset of that location in memory from the start of the file. */
- return ((Elf32_Addr)branchaddr - *got
- + ((int)(*branchaddr << 6 & 0xffffff00) >> 6));
+ runtime_dynamic = ((Elf32_Addr) branchaddr
+ + ((Elf32_Sword) (*branchaddr << 6 & 0xffffff00) >> 6));
+
+ return runtime_dynamic - elf_machine_dynamic ();
}
static inline void
@@ -163,3 +176,12 @@ elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
*reloc_addr = load_off + rpnt->r_addend;
} while (--relative_count);
}
+
+#define ARCH_NUM 1
+#define DT_PPC_GOT_IDX (DT_NUM + OS_NUM)
+
+#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
+do { \
+if (dpnt->d_tag == DT_PPC_GOT) \
+ dynamic[DT_PPC_GOT_IDX] = dpnt->d_un.d_ptr; \
+} while (0)
diff --git a/ldso/ldso/powerpc/elfinterp.c b/ldso/ldso/powerpc/elfinterp.c
index d2a164287..b48625a37 100644
--- a/ldso/ldso/powerpc/elfinterp.c
+++ b/ldso/ldso/powerpc/elfinterp.c
@@ -41,6 +41,12 @@ void _dl_init_got(unsigned long *plt,struct elf_resolve *tpnt)
Elf32_Word rel_offset_words;
Elf32_Word dlrr = (Elf32_Word) _dl_linux_resolve;
+ if (tpnt->dynamic_info[DT_JMPREL] == 0)
+ return;
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ tpnt->dynamic_info[DT_PPC_GOT_IDX] += tpnt->loadaddr;
+ return;
+ }
num_plt_entries = tpnt->dynamic_info[DT_PLTRELSZ] / sizeof(ELF_RELOC);
rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
data_words = (Elf32_Word) (plt + rel_offset_words);
@@ -148,32 +154,35 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "%x\n", finaladdr);
#endif
- delta = finaladdr - (Elf32_Word)reloc_addr;
- if (delta<<6>>6 == delta) {
- *reloc_addr = OPCODE_B(delta);
- } else if (finaladdr <= 0x01fffffc) {
- *reloc_addr = OPCODE_BA (finaladdr);
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ *reloc_addr = finaladdr;
} else {
- /* Warning: we don't handle double-sized PLT entries */
- Elf32_Word *plt, *data_words, index, offset;
+ delta = finaladdr - (Elf32_Word)reloc_addr;
+ if (delta<<6>>6 == delta) {
+ *reloc_addr = OPCODE_B(delta);
+ } else if (finaladdr <= 0x01fffffc) {
+ *reloc_addr = OPCODE_BA (finaladdr);
+ } else {
+ /* Warning: we don't handle double-sized PLT entries */
+ Elf32_Word *plt, *data_words, index, offset;
+
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ offset = reloc_addr - plt;
+ index = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
+ data_words = (Elf32_Word *)tpnt->data_words;
+ reloc_addr += 1;
- plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
- offset = reloc_addr - plt;
- index = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
- data_words = (Elf32_Word *)tpnt->data_words;
- reloc_addr += 1;
+ data_words[index] = finaladdr;
+ PPC_SYNC;
+ *reloc_addr = OPCODE_B ((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
+ }
- data_words[index] = finaladdr;
+ /* instructions were modified */
+ PPC_DCBST(reloc_addr);
PPC_SYNC;
- *reloc_addr = OPCODE_B ((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
+ PPC_ICBI(reloc_addr);
+ PPC_ISYNC;
}
-
- /* instructions were modified */
- PPC_DCBST(reloc_addr);
- PPC_SYNC;
- PPC_ICBI(reloc_addr);
- PPC_ISYNC;
-
return finaladdr;
}
@@ -219,28 +228,33 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope,
goto out_nocode; /* No code code modified */
case R_PPC_JMP_SLOT:
{
- Elf32_Sword delta = finaladdr - (Elf32_Word)reloc_addr;
- if (delta<<6>>6 == delta) {
- *reloc_addr = OPCODE_B(delta);
- } else if (finaladdr <= 0x01fffffc) {
- *reloc_addr = OPCODE_BA (finaladdr);
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ *reloc_addr = finaladdr;
+ goto out_nocode; /* No code code modified */
} else {
- /* Warning: we don't handle double-sized PLT entries */
- Elf32_Word *plt, *data_words, index, offset;
-
- plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
- offset = reloc_addr - plt;
- index = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
- data_words = (Elf32_Word *)tpnt->data_words;
-
- data_words[index] = finaladdr;
- reloc_addr[0] = OPCODE_LI(11,index*4);
- reloc_addr[1] = OPCODE_B((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
-
- /* instructions were modified */
- PPC_DCBST(reloc_addr+1);
- PPC_SYNC;
- PPC_ICBI(reloc_addr+1);
+ Elf32_Sword delta = finaladdr - (Elf32_Word)reloc_addr;
+ if (delta<<6>>6 == delta) {
+ *reloc_addr = OPCODE_B(delta);
+ } else if (finaladdr <= 0x01fffffc) {
+ *reloc_addr = OPCODE_BA (finaladdr);
+ } else {
+ /* Warning: we don't handle double-sized PLT entries */
+ Elf32_Word *plt, *data_words, index, offset;
+
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ offset = reloc_addr - plt;
+ index = (offset - PLT_INITIAL_ENTRY_WORDS)/2;
+ data_words = (Elf32_Word *)tpnt->data_words;
+
+ data_words[index] = finaladdr;
+ reloc_addr[0] = OPCODE_LI(11,index*4);
+ reloc_addr[1] = OPCODE_B((PLT_LONGBRANCH_ENTRY_WORDS - (offset+1)) * 4);
+
+ /* instructions were modified */
+ PPC_DCBST(reloc_addr+1);
+ PPC_SYNC;
+ PPC_ICBI(reloc_addr+1);
+ }
}
break;
}
@@ -309,9 +323,22 @@ void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
Elf32_Word *plt, offset, i, num_plt_entries, rel_offset_words;
num_plt_entries = rel_size / sizeof(ELF_RELOC);
+ plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
+ if (tpnt->dynamic_info[DT_PPC_GOT_IDX] != 0) {
+ /* Secure PLT */
+ Elf32_Addr *got = (Elf32_Addr *)tpnt->dynamic_info[DT_PPC_GOT_IDX];
+ Elf32_Word dlrr = (Elf32_Word) _dl_linux_resolve;
+
+ got[1] = (Elf32_Addr) dlrr;
+ got[2] = (Elf32_Addr) tpnt;
+
+ /* Relocate everything in .plt by the load address offset. */
+ while (num_plt_entries-- != 0)
+ *plt++ += tpnt->loadaddr;
+ return;
+ }
rel_offset_words = PLT_DATA_START_WORDS(num_plt_entries);
- plt = (Elf32_Word *)tpnt->dynamic_info[DT_PLTGOT];
/* Set up the lazy PLT entries. */
offset = PLT_INITIAL_ENTRY_WORDS;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 16:07:31 +0000