mirror of git://git.musl-libc.org/musl
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
#include <string.h>
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#include <elf.h>
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#include <endian.h>
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define ENDIAN_SUFFIX "el"
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#else
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#define ENDIAN_SUFFIX ""
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#endif
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#ifdef __mips_soft_float
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#define FP_SUFFIX "-sf"
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#else
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#define FP_SUFFIX ""
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#endif
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#define LDSO_ARCH "mips" ENDIAN_SUFFIX FP_SUFFIX
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#define TPOFF_K (-0x7000)
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static int remap_rel(int type)
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{
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switch(type) {
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case R_MIPS_REL32:
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return REL_SYM_OR_REL;
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case R_MIPS_JUMP_SLOT:
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return REL_PLT;
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case R_MIPS_COPY:
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return REL_COPY;
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case R_MIPS_TLS_DTPMOD32:
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return REL_DTPMOD;
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case R_MIPS_TLS_DTPREL32:
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return REL_DTPOFF;
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case R_MIPS_TLS_TPREL32:
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return REL_TPOFF;
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}
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return 0;
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}
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void __reloc_self(int c, size_t *a, size_t *dynv, size_t *got)
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{
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char *base;
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size_t t[20], n;
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for (a+=c+1; *a; a++);
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for (a++; *a; a+=2) if (*a<20) t[*a] = a[1];
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base = (char *)t[AT_BASE];
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if (!base) base = (char *)(t[AT_PHDR] & -t[AT_PAGESZ]);
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for (a=dynv; *a; a+=2) if (*a-0x70000000UL<20) t[*a&31] = a[1];
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n = t[DT_MIPS_LOCAL_GOTNO - 0x70000000];
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for (a=got; n; a++, n--) *a += (size_t)base;
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}
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static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride);
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static void do_arch_relocs(struct dso *this, struct dso *head)
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{
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unsigned char *base = this->base;
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size_t *dynv = this->dynv;
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size_t dyn[20] = {0};
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size_t i;
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size_t rel[2], got=0;
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Sym *sym;
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for (i=0; dynv[i]; i+=2) {
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if (dynv[i]-0x70000000UL<20)
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dyn[dynv[i]&31] = dynv[i+1];
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else if (dynv[i] == DT_PLTGOT)
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got = dynv[i+1];
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}
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i = dyn[DT_MIPS_LOCAL_GOTNO-0x70000000];
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if (this->shortname && !strcmp(this->shortname, "libc.so")) {
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got += sizeof(size_t) * i;
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} else {
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for (; i; i--, got+=sizeof(size_t))
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*(size_t *)(base+got) += (size_t)base;
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}
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sym = this->syms + dyn[DT_MIPS_GOTSYM-0x70000000];
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i = dyn[DT_MIPS_SYMTABNO-0x70000000] - dyn[DT_MIPS_GOTSYM-0x70000000];
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for (; i; i--, got+=sizeof(size_t), sym++) {
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rel[0] = got;
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rel[1] = sym-this->syms << 8 | R_MIPS_JUMP_SLOT;
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*(size_t *)(base+got) = 0;
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do_relocs(this, rel, sizeof rel, 2);
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}
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}
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#define NEED_ARCH_RELOCS 1
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#define DYNAMIC_IS_RO 1
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#define ARCH_SYM_REJECT_UND(s) (!((s)->st_other & STO_MIPS_PLT))
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