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f389c4984a
prior to this change, using a non-default syslibdir was impractical on systems where the ordinary library paths contain musl-incompatible library files. the file containing search paths was always taken from /etc, which would either correspond to a system-wide musl installation, or fail to exist at all, resulting in searching of the default library path. the new search strategy is safe even for suid programs because the pathname used comes from the PT_INTERP header of the program being run, rather than any external input. as part of this change, I have also begun differentiating the names of arch variants that differ by endianness or floating point calling convention. the corresponding changes in the build system and and gcc wrapper script (to use an alternate dynamic linker name) for these configurations have not yet been made.
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#include <stdint.h>
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#include <string.h>
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#include <elf.h>
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#define LDSO_ARCH "x86_64"
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#define IS_COPY(x) ((x)==R_X86_64_COPY)
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#define IS_PLT(x) ((x)==R_X86_64_JUMP_SLOT)
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static inline void do_single_reloc(
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struct dso *self, unsigned char *base_addr,
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size_t *reloc_addr, int type, size_t addend,
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Sym *sym, size_t sym_size,
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struct symdef def, size_t sym_val)
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{
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switch(type) {
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case R_X86_64_GLOB_DAT:
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case R_X86_64_JUMP_SLOT:
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case R_X86_64_64:
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*reloc_addr = sym_val + addend;
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break;
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case R_X86_64_32:
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*(uint32_t *)reloc_addr = sym_val + addend;
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break;
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case R_X86_64_PC32:
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*reloc_addr = sym_val + addend - (size_t)reloc_addr + (size_t)base_addr;
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break;
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case R_X86_64_RELATIVE:
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*reloc_addr = (size_t)base_addr + addend;
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break;
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case R_X86_64_COPY:
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memcpy(reloc_addr, (void *)sym_val, sym_size);
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break;
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case R_X86_64_DTPMOD64:
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*reloc_addr = def.dso ? def.dso->tls_id : self->tls_id;
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break;
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case R_X86_64_DTPOFF64:
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*reloc_addr = def.sym->st_value + addend;
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break;
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case R_X86_64_TPOFF64:
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*reloc_addr = (def.sym
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? def.sym->st_value - def.dso->tls_offset
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: 0 - self->tls_offset) + addend;
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break;
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}
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}
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