mirror of https://github.com/hak5/openwrt-owl.git
Felix Fietkau
parent
60fb2fd748
commit
de6c0303ee
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@ -0,0 +1,289 @@
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--- a/include/elf.h
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+++ b/include/elf.h
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@@ -1547,6 +1547,7 @@ typedef struct
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#define STO_MIPS_INTERNAL 0x1
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#define STO_MIPS_HIDDEN 0x2
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#define STO_MIPS_PROTECTED 0x3
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+#define STO_MIPS_PLT 0x8
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#define STO_MIPS_SC_ALIGN_UNUSED 0xff
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/* MIPS specific values for `st_info'. */
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@@ -1692,8 +1693,11 @@ typedef struct
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#define R_MIPS_TLS_TPREL64 48 /* TP-relative offset, 64 bit */
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#define R_MIPS_TLS_TPREL_HI16 49 /* TP-relative offset, high 16 bits */
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#define R_MIPS_TLS_TPREL_LO16 50 /* TP-relative offset, low 16 bits */
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+#define R_MIPS_GLOB_DAT 51
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+#define R_MIPS_COPY 126
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+#define R_MIPS_JUMP_SLOT 127
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/* Keep this the last entry. */
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-#define R_MIPS_NUM 51
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+#define R_MIPS_NUM 128
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/* Legal values for p_type field of Elf32_Phdr. */
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@@ -1759,7 +1763,13 @@ typedef struct
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#define DT_MIPS_COMPACT_SIZE 0x7000002f /* (O32)Size of compact rel section. */
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#define DT_MIPS_GP_VALUE 0x70000030 /* GP value for aux GOTs. */
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#define DT_MIPS_AUX_DYNAMIC 0x70000031 /* Address of aux .dynamic. */
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-#define DT_MIPS_NUM 0x32
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+/* The address of .got.plt in an executable using the new non-PIC ABI. */
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+#define DT_MIPS_PLTGOT 0x70000032
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+/* The base of the PLT in an executable using the new non-PIC ABI if that
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+ PLT is writable. For a non-writable PLT, this is omitted or has a zero
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+ value. */
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+#define DT_MIPS_RWPLT 0x70000034
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+#define DT_MIPS_NUM 0x35
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/* Legal values for DT_MIPS_FLAGS Elf32_Dyn entry. */
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--- a/ldso/ldso/dl-hash.c
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+++ b/ldso/ldso/dl-hash.c
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@@ -160,6 +160,11 @@ check_match (const ElfW(Sym) *sym, char
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/* undefined symbol itself */
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return NULL;
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+#ifdef __mips__
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+ if (sym->st_shndx == SHN_UNDEF && !(sym->st_other & STO_MIPS_PLT))
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+ return NULL;
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+#endif
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+
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if (sym->st_value == 0)
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/* No value */
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return NULL;
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--- a/ldso/ldso/mips/dl-sysdep.h
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+++ b/ldso/ldso/mips/dl-sysdep.h
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@@ -93,10 +93,11 @@ typedef struct
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#include <link.h>
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-#define ARCH_NUM 3
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+#define ARCH_NUM 4
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#define DT_MIPS_GOTSYM_IDX (DT_NUM + OS_NUM)
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#define DT_MIPS_LOCAL_GOTNO_IDX (DT_NUM + OS_NUM +1)
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#define DT_MIPS_SYMTABNO_IDX (DT_NUM + OS_NUM +2)
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+#define DT_MIPS_PLTGOT_IDX (DT_NUM + OS_NUM +3)
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#define ARCH_DYNAMIC_INFO(dpnt, dynamic, debug_addr) \
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do { \
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@@ -106,6 +107,8 @@ else if (dpnt->d_tag == DT_MIPS_LOCAL_GO
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dynamic[DT_MIPS_LOCAL_GOTNO_IDX] = dpnt->d_un.d_val; \
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else if (dpnt->d_tag == DT_MIPS_SYMTABNO) \
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dynamic[DT_MIPS_SYMTABNO_IDX] = dpnt->d_un.d_val; \
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+else if (dpnt->d_tag == DT_MIPS_PLTGOT) \
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+ dynamic[DT_MIPS_PLTGOT_IDX] = dpnt->d_un.d_val; \
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else if (dpnt->d_tag == DT_MIPS_RLD_MAP) \
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*(ElfW(Addr) *)(dpnt->d_un.d_ptr) = (ElfW(Addr)) debug_addr; \
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} while (0)
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@@ -114,6 +117,7 @@ else if (dpnt->d_tag == DT_MIPS_RLD_MAP)
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#define INIT_GOT(GOT_BASE,MODULE) \
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do { \
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unsigned long idx; \
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+ unsigned long *pltgot; \
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\
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/* Check if this is the dynamic linker itself */ \
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if (MODULE->libtype == program_interpreter) \
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@@ -123,6 +127,12 @@ do { \
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GOT_BASE[0] = (unsigned long) _dl_runtime_resolve; \
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GOT_BASE[1] = (unsigned long) MODULE; \
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\
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+ pltgot = MODULE->dynamic_info[DT_MIPS_PLTGOT_IDX]; \
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+ if (pltgot) { \
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+ pltgot[0] = (unsigned long) _dl_runtime_pltresolve; \
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+ pltgot[1] = (unsigned long) MODULE; \
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+ } \
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+ \
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/* Add load address displacement to all local GOT entries */ \
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idx = 2; \
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while (idx < MODULE->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX]) \
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@@ -157,9 +167,9 @@ void _dl_perform_mips_global_got_relocat
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#define OFFS_ALIGN 0x7ffff000
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#endif /* O32 || N32 */
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-#define elf_machine_type_class(type) ELF_RTYPE_CLASS_PLT
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-/* MIPS does not have COPY relocs */
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-#define DL_NO_COPY_RELOCS
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+#define elf_machine_type_class(type) \
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+ ((((type) == R_MIPS_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
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+ | (((type) == R_MIPS_COPY) * ELF_RTYPE_CLASS_COPY))
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#define OFFSET_GP_GOT 0x7ff0
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--- a/ldso/ldso/mips/elfinterp.c
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+++ b/ldso/ldso/mips/elfinterp.c
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@@ -30,6 +30,7 @@
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#include "ldso.h"
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extern int _dl_runtime_resolve(void);
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+extern int _dl_runtime_pltresolve(void);
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#define OFFSET_GP_GOT 0x7ff0
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@@ -83,6 +84,61 @@ unsigned long __dl_runtime_resolve(unsig
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return new_addr;
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}
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+unsigned long
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+__dl_runtime_pltresolve(struct elf_resolve *tpnt, int reloc_entry)
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+{
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+ int reloc_type;
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+ ELF_RELOC *this_reloc;
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+ char *strtab;
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+ Elf32_Sym *symtab;
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+ int symtab_index;
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+ char *rel_addr;
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+ char *new_addr;
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+ char **got_addr;
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+ unsigned long instr_addr;
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+ char *symname;
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+
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+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
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+ this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
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+ reloc_type = ELF32_R_TYPE(this_reloc->r_info);
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+ symtab_index = ELF32_R_SYM(this_reloc->r_info);
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+
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+ symtab = (Elf32_Sym *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
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+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
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+ symname = strtab + symtab[symtab_index].st_name;
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+
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+ /* Address of the jump instruction to fix up. */
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+ instr_addr = ((unsigned long)this_reloc->r_offset +
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+ (unsigned long)tpnt->loadaddr);
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+ got_addr = (char **)instr_addr;
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+
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+ /* Get the address of the GOT entry. */
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+ new_addr = _dl_find_hash(symname, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
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+ if (unlikely(!new_addr)) {
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+ _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
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+ _dl_exit(1);
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+ }
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+
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ if ((unsigned long)got_addr < 0x40000000) {
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+ if (_dl_debug_bindings) {
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+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
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+ if (_dl_debug_detail)
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+ _dl_dprintf(_dl_debug_file,
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+ "\n\tpatched: %x ==> %x @ %x",
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+ *got_addr, new_addr, got_addr);
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+ }
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+ }
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+ if (!_dl_debug_nofixups) {
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+ *got_addr = new_addr;
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+ }
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+#else
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+ *got_addr = new_addr;
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+#endif
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+
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+ return (unsigned long)new_addr;
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+}
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+
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void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
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unsigned long rel_addr, unsigned long rel_size)
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{
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@@ -115,6 +171,7 @@ int _dl_parse_relocation_information(str
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got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];
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for (i = 0; i < rel_size; i++, rpnt++) {
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+ char *symname = NULL;
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reloc_addr = (unsigned long *) (tpnt->loadaddr +
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(unsigned long) rpnt->r_offset);
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reloc_type = ELF_R_TYPE(rpnt->r_info);
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@@ -128,6 +185,16 @@ int _dl_parse_relocation_information(str
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old_val = *reloc_addr;
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#endif
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+ if (reloc_type == R_MIPS_JUMP_SLOT || reloc_type == R_MIPS_COPY) {
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+ symname = strtab + symtab[symtab_index].st_name;
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+ symbol_addr = (unsigned long)_dl_find_hash(symname,
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+ tpnt->symbol_scope,
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+ tpnt,
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+ elf_machine_type_class(reloc_type));
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+ if (unlikely(!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
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+ return 1;
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+ }
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+
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switch (reloc_type) {
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#if _MIPS_SIM == _MIPS_SIM_ABI64
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case (R_MIPS_64 << 8) | R_MIPS_REL32:
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@@ -148,6 +215,24 @@ int _dl_parse_relocation_information(str
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*reloc_addr += (unsigned long) tpnt->loadaddr;
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}
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break;
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+ case R_MIPS_JUMP_SLOT:
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+ *reloc_addr = symbol_addr;
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+ break;
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+ case R_MIPS_COPY:
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+ if (symbol_addr) {
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ if (_dl_debug_move)
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+ _dl_dprintf(_dl_debug_file,
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+ "\n%s move %d bytes from %x to %x",
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+ symname, symtab[symtab_index].st_size,
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+ symbol_addr, reloc_addr);
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+#endif
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+
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+ _dl_memcpy((char *)reloc_addr,
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+ (char *)symbol_addr,
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+ symtab[symtab_index].st_size);
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+ }
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+ break;
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case R_MIPS_NONE:
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break;
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default:
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--- a/ldso/ldso/mips/resolve.S
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+++ b/ldso/ldso/mips/resolve.S
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@@ -112,3 +112,54 @@ _dl_runtime_resolve:
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.end _dl_runtime_resolve
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.previous
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+/* Assembler veneer called from the PLT header code when using the
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+ non-PIC ABI.
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+
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+ Code in each PLT entry puts the caller's return address into t7 ($15),
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+ the PLT entry index into t8 ($24), the address of _dl_runtime_pltresolve
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+ into t9 ($25) and the address of .got.plt into gp ($28). __dl_runtime_pltresolve
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+ needs a0 ($4) to hold the link map and a1 ($5) to hold the index into
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+ .rel.plt (== PLT entry index * 4). */
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+
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+ .text
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+ .align 2
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+ .globl _dl_runtime_pltresolve
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+ .type _dl_runtime_pltresolve,@function
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+ .ent _dl_runtime_pltresolve
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+_dl_runtime_pltresolve:
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+ .frame $29, 40, $31
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+ .set noreorder
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+ # Save arguments and sp value in stack.
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+ subu $29, 40
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+ lw $10, 4($28)
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+ # Modify t9 ($25) so as to point .cpload instruction.
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+ addiu $25, 12
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+ # Compute GP.
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+ .cpload $25
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+ .set reorder
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+
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+ /* Store function arguments from registers to stack */
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+ sw $15, 36($29)
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+ sw $4, 16($29)
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+ sw $5, 20($29)
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+ sw $6, 24($29)
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+ sw $7, 28($29)
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+
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+ /* Setup functions args and call __dl_runtime_pltresolve. */
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+ move $4, $10
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+ sll $5, $24, 3
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+ jal __dl_runtime_pltresolve
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+
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+ /* Restore function arguments from stack to registers */
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+ lw $31, 36($29)
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+ lw $4, 16($29)
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+ lw $5, 20($29)
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+ lw $6, 24($29)
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+ lw $7, 28($29)
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+
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+ /* Do a tail call to the original function */
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+ addiu $29, 40
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+ move $25, $2
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+ jr $25
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+ .end _dl_runtime_pltresolve
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+ .previous
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