mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 18:47:06 +00:00
290 lines
8.9 KiB
Diff
290 lines
8.9 KiB
Diff
--- a/include/elf.h
|
|
+++ b/include/elf.h
|
|
@@ -1547,6 +1547,7 @@ typedef struct
|
|
#define STO_MIPS_INTERNAL 0x1
|
|
#define STO_MIPS_HIDDEN 0x2
|
|
#define STO_MIPS_PROTECTED 0x3
|
|
+#define STO_MIPS_PLT 0x8
|
|
#define STO_MIPS_SC_ALIGN_UNUSED 0xff
|
|
|
|
/* MIPS specific values for `st_info'. */
|
|
@@ -1692,8 +1693,11 @@ typedef struct
|
|
#define R_MIPS_TLS_TPREL64 48 /* TP-relative offset, 64 bit */
|
|
#define R_MIPS_TLS_TPREL_HI16 49 /* TP-relative offset, high 16 bits */
|
|
#define R_MIPS_TLS_TPREL_LO16 50 /* TP-relative offset, low 16 bits */
|
|
+#define R_MIPS_GLOB_DAT 51
|
|
+#define R_MIPS_COPY 126
|
|
+#define R_MIPS_JUMP_SLOT 127
|
|
/* Keep this the last entry. */
|
|
-#define R_MIPS_NUM 51
|
|
+#define R_MIPS_NUM 128
|
|
|
|
/* Legal values for p_type field of Elf32_Phdr. */
|
|
|
|
@@ -1759,7 +1763,13 @@ typedef struct
|
|
#define DT_MIPS_COMPACT_SIZE 0x7000002f /* (O32)Size of compact rel section. */
|
|
#define DT_MIPS_GP_VALUE 0x70000030 /* GP value for aux GOTs. */
|
|
#define DT_MIPS_AUX_DYNAMIC 0x70000031 /* Address of aux .dynamic. */
|
|
-#define DT_MIPS_NUM 0x32
|
|
+/* The address of .got.plt in an executable using the new non-PIC ABI. */
|
|
+#define DT_MIPS_PLTGOT 0x70000032
|
|
+/* The base of the PLT in an executable using the new non-PIC ABI if that
|
|
+ PLT is writable. For a non-writable PLT, this is omitted or has a zero
|
|
+ value. */
|
|
+#define DT_MIPS_RWPLT 0x70000034
|
|
+#define DT_MIPS_NUM 0x35
|
|
|
|
/* Legal values for DT_MIPS_FLAGS Elf32_Dyn entry. */
|
|
|
|
--- a/ldso/ldso/dl-hash.c
|
|
+++ b/ldso/ldso/dl-hash.c
|
|
@@ -160,6 +160,11 @@ check_match (const ElfW(Sym) *sym, char
|
|
/* undefined symbol itself */
|
|
return NULL;
|
|
|
|
+#ifdef __mips__
|
|
+ if (sym->st_shndx == SHN_UNDEF && !(sym->st_other & STO_MIPS_PLT))
|
|
+ return NULL;
|
|
+#endif
|
|
+
|
|
if (sym->st_value == 0)
|
|
/* No value */
|
|
return NULL;
|
|
--- a/ldso/ldso/mips/dl-sysdep.h
|
|
+++ b/ldso/ldso/mips/dl-sysdep.h
|
|
@@ -93,10 +93,11 @@ typedef struct
|
|
|
|
#include <link.h>
|
|
|
|
-#define ARCH_NUM 3
|
|
+#define ARCH_NUM 4
|
|
#define DT_MIPS_GOTSYM_IDX (DT_NUM + OS_NUM)
|
|
#define DT_MIPS_LOCAL_GOTNO_IDX (DT_NUM + OS_NUM +1)
|
|
#define DT_MIPS_SYMTABNO_IDX (DT_NUM + OS_NUM +2)
|
|
+#define DT_MIPS_PLTGOT_IDX (DT_NUM + OS_NUM +3)
|
|
|
|
#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
|
|
do { \
|
|
@@ -106,6 +107,8 @@ else if (dpnt->d_tag == DT_MIPS_LOCAL_GO
|
|
dynamic[DT_MIPS_LOCAL_GOTNO_IDX] = dpnt->d_un.d_val; \
|
|
else if (dpnt->d_tag == DT_MIPS_SYMTABNO) \
|
|
dynamic[DT_MIPS_SYMTABNO_IDX] = dpnt->d_un.d_val; \
|
|
+else if (dpnt->d_tag == DT_MIPS_PLTGOT) \
|
|
+ dynamic[DT_MIPS_PLTGOT_IDX] = dpnt->d_un.d_val; \
|
|
else if (dpnt->d_tag == DT_MIPS_RLD_MAP) \
|
|
*(ElfW(Addr) *)(dpnt->d_un.d_ptr) = (ElfW(Addr)) debug_addr; \
|
|
} while (0)
|
|
@@ -114,6 +117,7 @@ else if (dpnt->d_tag == DT_MIPS_RLD_MAP)
|
|
#define INIT_GOT(GOT_BASE,MODULE) \
|
|
do { \
|
|
unsigned long idx; \
|
|
+ unsigned long *pltgot; \
|
|
\
|
|
/* Check if this is the dynamic linker itself */ \
|
|
if (MODULE->libtype == program_interpreter) \
|
|
@@ -123,6 +127,12 @@ do { \
|
|
GOT_BASE[0] = (unsigned long) _dl_runtime_resolve; \
|
|
GOT_BASE[1] = (unsigned long) MODULE; \
|
|
\
|
|
+ pltgot = MODULE->dynamic_info[DT_MIPS_PLTGOT_IDX]; \
|
|
+ if (pltgot) { \
|
|
+ pltgot[0] = (unsigned long) _dl_runtime_pltresolve; \
|
|
+ pltgot[1] = (unsigned long) MODULE; \
|
|
+ } \
|
|
+ \
|
|
/* Add load address displacement to all local GOT entries */ \
|
|
idx = 2; \
|
|
while (idx < MODULE->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]) \
|
|
@@ -157,9 +167,9 @@ void _dl_perform_mips_global_got_relocat
|
|
#define OFFS_ALIGN 0x7ffff000
|
|
#endif /* O32 || N32 */
|
|
|
|
-#define elf_machine_type_class(type) ELF_RTYPE_CLASS_PLT
|
|
-/* MIPS does not have COPY relocs */
|
|
-#define DL_NO_COPY_RELOCS
|
|
+#define elf_machine_type_class(type) \
|
|
+ ((((type) == R_MIPS_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
|
|
+ | (((type) == R_MIPS_COPY) * ELF_RTYPE_CLASS_COPY))
|
|
|
|
#define OFFSET_GP_GOT 0x7ff0
|
|
|
|
--- a/ldso/ldso/mips/elfinterp.c
|
|
+++ b/ldso/ldso/mips/elfinterp.c
|
|
@@ -30,6 +30,7 @@
|
|
#include "ldso.h"
|
|
|
|
extern int _dl_runtime_resolve(void);
|
|
+extern int _dl_runtime_pltresolve(void);
|
|
|
|
#define OFFSET_GP_GOT 0x7ff0
|
|
|
|
@@ -83,6 +84,61 @@ unsigned long __dl_runtime_resolve(unsig
|
|
return new_addr;
|
|
}
|
|
|
|
+unsigned long
|
|
+__dl_runtime_pltresolve(struct elf_resolve *tpnt, int reloc_entry)
|
|
+{
|
|
+ int reloc_type;
|
|
+ ELF_RELOC *this_reloc;
|
|
+ char *strtab;
|
|
+ Elf32_Sym *symtab;
|
|
+ int symtab_index;
|
|
+ char *rel_addr;
|
|
+ char *new_addr;
|
|
+ char **got_addr;
|
|
+ unsigned long instr_addr;
|
|
+ char *symname;
|
|
+
|
|
+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
|
|
+ this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
|
|
+ reloc_type = ELF32_R_TYPE(this_reloc->r_info);
|
|
+ symtab_index = ELF32_R_SYM(this_reloc->r_info);
|
|
+
|
|
+ symtab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
|
|
+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
|
|
+ symname = strtab + symtab[symtab_index].st_name;
|
|
+
|
|
+ /* Address of the jump instruction to fix up. */
|
|
+ instr_addr = ((unsigned long)this_reloc->r_offset +
|
|
+ (unsigned long)tpnt->loadaddr);
|
|
+ got_addr = (char **)instr_addr;
|
|
+
|
|
+ /* Get the address of the GOT entry. */
|
|
+ new_addr = _dl_find_hash(symname, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
|
|
+ if (unlikely(!new_addr)) {
|
|
+ _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
|
|
+ _dl_exit(1);
|
|
+ }
|
|
+
|
|
+#if defined (__SUPPORT_LD_DEBUG__)
|
|
+ if ((unsigned long)got_addr < 0x40000000) {
|
|
+ if (_dl_debug_bindings) {
|
|
+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
|
|
+ if (_dl_debug_detail)
|
|
+ _dl_dprintf(_dl_debug_file,
|
|
+ "\n\tpatched: %x ==> %x @ %x",
|
|
+ *got_addr, new_addr, got_addr);
|
|
+ }
|
|
+ }
|
|
+ if (!_dl_debug_nofixups) {
|
|
+ *got_addr = new_addr;
|
|
+ }
|
|
+#else
|
|
+ *got_addr = new_addr;
|
|
+#endif
|
|
+
|
|
+ return (unsigned long)new_addr;
|
|
+}
|
|
+
|
|
void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
|
|
unsigned long rel_addr, unsigned long rel_size)
|
|
{
|
|
@@ -115,6 +171,7 @@ int _dl_parse_relocation_information(str
|
|
got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];
|
|
|
|
for (i = 0; i < rel_size; i++, rpnt++) {
|
|
+ char *symname = NULL;
|
|
reloc_addr = (unsigned long *) (tpnt->loadaddr +
|
|
(unsigned long) rpnt->r_offset);
|
|
reloc_type = ELF_R_TYPE(rpnt->r_info);
|
|
@@ -128,6 +185,16 @@ int _dl_parse_relocation_information(str
|
|
old_val = *reloc_addr;
|
|
#endif
|
|
|
|
+ if (reloc_type == R_MIPS_JUMP_SLOT || reloc_type == R_MIPS_COPY) {
|
|
+ symname = strtab + symtab[symtab_index].st_name;
|
|
+ symbol_addr = (unsigned long)_dl_find_hash(symname,
|
|
+ tpnt->symbol_scope,
|
|
+ tpnt,
|
|
+ elf_machine_type_class(reloc_type));
|
|
+ if (unlikely(!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
|
|
+ return 1;
|
|
+ }
|
|
+
|
|
switch (reloc_type) {
|
|
#if _MIPS_SIM == _MIPS_SIM_ABI64
|
|
case (R_MIPS_64 << 8) | R_MIPS_REL32:
|
|
@@ -148,6 +215,24 @@ int _dl_parse_relocation_information(str
|
|
*reloc_addr += (unsigned long) tpnt->loadaddr;
|
|
}
|
|
break;
|
|
+ case R_MIPS_JUMP_SLOT:
|
|
+ *reloc_addr = symbol_addr;
|
|
+ break;
|
|
+ case R_MIPS_COPY:
|
|
+ if (symbol_addr) {
|
|
+#if defined (__SUPPORT_LD_DEBUG__)
|
|
+ if (_dl_debug_move)
|
|
+ _dl_dprintf(_dl_debug_file,
|
|
+ "\n%s move %d bytes from %x to %x",
|
|
+ symname, symtab[symtab_index].st_size,
|
|
+ symbol_addr, reloc_addr);
|
|
+#endif
|
|
+
|
|
+ _dl_memcpy((char *)reloc_addr,
|
|
+ (char *)symbol_addr,
|
|
+ symtab[symtab_index].st_size);
|
|
+ }
|
|
+ break;
|
|
case R_MIPS_NONE:
|
|
break;
|
|
default:
|
|
--- a/ldso/ldso/mips/resolve.S
|
|
+++ b/ldso/ldso/mips/resolve.S
|
|
@@ -112,3 +112,54 @@ _dl_runtime_resolve:
|
|
.end _dl_runtime_resolve
|
|
.previous
|
|
|
|
+/* Assembler veneer called from the PLT header code when using the
|
|
+ non-PIC ABI.
|
|
+
|
|
+ Code in each PLT entry puts the caller's return address into t7 ($15),
|
|
+ the PLT entry index into t8 ($24), the address of _dl_runtime_pltresolve
|
|
+ into t9 ($25) and the address of .got.plt into gp ($28). __dl_runtime_pltresolve
|
|
+ needs a0 ($4) to hold the link map and a1 ($5) to hold the index into
|
|
+ .rel.plt (== PLT entry index * 4). */
|
|
+
|
|
+ .text
|
|
+ .align 2
|
|
+ .globl _dl_runtime_pltresolve
|
|
+ .type _dl_runtime_pltresolve,@function
|
|
+ .ent _dl_runtime_pltresolve
|
|
+_dl_runtime_pltresolve:
|
|
+ .frame $29, 40, $31
|
|
+ .set noreorder
|
|
+ # Save arguments and sp value in stack.
|
|
+ subu $29, 40
|
|
+ lw $10, 4($28)
|
|
+ # Modify t9 ($25) so as to point .cpload instruction.
|
|
+ addiu $25, 12
|
|
+ # Compute GP.
|
|
+ .cpload $25
|
|
+ .set reorder
|
|
+
|
|
+ /* Store function arguments from registers to stack */
|
|
+ sw $15, 36($29)
|
|
+ sw $4, 16($29)
|
|
+ sw $5, 20($29)
|
|
+ sw $6, 24($29)
|
|
+ sw $7, 28($29)
|
|
+
|
|
+ /* Setup functions args and call __dl_runtime_pltresolve. */
|
|
+ move $4, $10
|
|
+ sll $5, $24, 3
|
|
+ jal __dl_runtime_pltresolve
|
|
+
|
|
+ /* Restore function arguments from stack to registers */
|
|
+ lw $31, 36($29)
|
|
+ lw $4, 16($29)
|
|
+ lw $5, 20($29)
|
|
+ lw $6, 24($29)
|
|
+ lw $7, 28($29)
|
|
+
|
|
+ /* Do a tail call to the original function */
|
|
+ addiu $29, 40
|
|
+ move $25, $2
|
|
+ jr $25
|
|
+ .end _dl_runtime_pltresolve
|
|
+ .previous
|