mirror of
https://github.com/fluencelabs/musl
synced 2025-05-04 03:22:15 +00:00
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.
55 lines
1.1 KiB
C
55 lines
1.1 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 == __BIG_ENDIAN
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#define ENDIAN_SUFFIX "eb"
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#else
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#define ENDIAN_SUFFIX ""
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#endif
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#if __SOFTFP__
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#define FP_SUFFIX ""
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#else
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#define FP_SUFFIX "hf"
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#endif
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#define LDSO_ARCH "arm" ENDIAN_SUFFIX FP_SUFFIX
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#define IS_COPY(x) ((x)==R_ARM_COPY)
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#define IS_PLT(x) ((x)==R_ARM_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_ARM_ABS32:
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*reloc_addr += sym_val;
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break;
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case R_ARM_GLOB_DAT:
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case R_ARM_JUMP_SLOT:
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*reloc_addr = sym_val;
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break;
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case R_ARM_RELATIVE:
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*reloc_addr += (size_t)base_addr;
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break;
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case R_ARM_COPY:
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memcpy(reloc_addr, (void *)sym_val, sym_size);
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break;
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case R_ARM_TLS_DTPMOD32:
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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_ARM_TLS_DTPOFF32:
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*reloc_addr += def.sym->st_value;
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break;
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case R_ARM_TLS_TPOFF32:
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*reloc_addr += def.sym
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? def.sym->st_value + def.dso->tls_offset + 8
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: self->tls_offset + 8;
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break;
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}
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}
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