Loading...
#include <string.h> #include <elf.h> #include <endian.h> #if __BYTE_ORDER == __LITTLE_ENDIAN #define ENDIAN_SUFFIX "el" #else #define ENDIAN_SUFFIX "" #endif #ifdef __mips_soft_float #define FP_SUFFIX "-sf" #else #define FP_SUFFIX "" #endif #define LDSO_ARCH "mips" ENDIAN_SUFFIX FP_SUFFIX #define IS_COPY(x) ((x)==R_MIPS_COPY) #define IS_PLT(x) 1 static inline void do_single_reloc( struct dso *self, unsigned char *base_addr, size_t *reloc_addr, int type, size_t addend, Sym *sym, size_t sym_size, struct symdef def, size_t sym_val) { switch(type) { case R_MIPS_JUMP_SLOT: *reloc_addr = sym_val; break; case R_MIPS_REL32: if (sym_val) *reloc_addr += sym_val; else *reloc_addr += (size_t)base_addr; break; case R_MIPS_COPY: memcpy(reloc_addr, (void *)sym_val, sym_size); break; case R_MIPS_TLS_DTPMOD32: *reloc_addr = def.dso ? def.dso->tls_id : self->tls_id; break; case R_MIPS_TLS_DTPREL32: *reloc_addr += def.sym->st_value; break; case R_MIPS_TLS_TPREL32: *reloc_addr += def.sym ? def.sym->st_value + def.dso->tls_offset - 0x7000 : self->tls_offset - 0x7000; break; } } void __reloc_self(int c, size_t *a, size_t *dynv, size_t *got) { char *base; size_t t[20], n; for (a+=c+1; *a; a++); for (a++; *a; a+=2) if (*a<20) t[*a] = a[1]; base = (char *)t[AT_BASE]; if (!base) base = (char *)(t[AT_PHDR] & -t[AT_PAGESZ]); for (a=dynv; *a; a+=2) if (*a-0x70000000UL<20) t[*a&31] = a[1]; n = t[DT_MIPS_LOCAL_GOTNO - 0x70000000]; for (a=got; n; a++, n--) *a += (size_t)base; } static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride); static void do_arch_relocs(struct dso *this, struct dso *head) { unsigned char *base = this->base; size_t *dynv = this->dynv; size_t dyn[20] = {0}; size_t i; size_t rel[2], got=0; Sym *sym; for (i=0; dynv[i]; i+=2) { if (dynv[i]-0x70000000UL<20) dyn[dynv[i]&31] = dynv[i+1]; else if (dynv[i] == DT_PLTGOT) got = dynv[i+1]; } i = dyn[DT_MIPS_LOCAL_GOTNO-0x70000000]; if (this->shortname && !strcmp(this->shortname, "libc.so")) { got += sizeof(size_t) * i; } else { for (; i; i--, got+=sizeof(size_t)) *(size_t *)(base+got) += (size_t)base; } sym = this->syms + dyn[DT_MIPS_GOTSYM-0x70000000]; i = dyn[DT_MIPS_SYMTABNO-0x70000000] - dyn[DT_MIPS_GOTSYM-0x70000000]; for (; i; i--, got+=sizeof(size_t), sym++) { rel[0] = got; rel[1] = sym-this->syms << 8 | R_MIPS_JUMP_SLOT; *(size_t *)(base+got) = 0; do_relocs(this, rel, sizeof rel, 2); } } #define NEED_ARCH_RELOCS 1 #define DYNAMIC_IS_RO 1 |