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git://git.musl-libc.org/musl
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b20760c023
PAGE_SIZE was hardcoded to 4096, which is historically what most systems use, but on several archs it is a kernel config parameter, user space can only know it at execution time from the aux vector. PAGE_SIZE and PAGESIZE are not defined on archs where page size is a runtime parameter, applications should use sysconf(_SC_PAGE_SIZE) to query it. Internally libc code defines PAGE_SIZE to libc.page_size, which is set to aux[AT_PAGESZ] in __init_libc and early in __dynlink as well. (Note that libc.page_size can be accessed without GOT, ie. before relocations are done) Some fpathconf settings are hardcoded to 4096, these should be actually queried from the filesystem using statfs.
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include <string.h>
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#include <elf.h>
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#define LDSO_ARCH "powerpc"
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#define IS_COPY(x) ((x)==R_PPC_COPY)
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#define IS_PLT(x) ((x)==R_PPC_JMP_SLOT)
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// see linux' arch/powerpc/include/asm/elf.h
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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_PPC_GLOB_DAT:
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case R_PPC_JMP_SLOT:
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case R_PPC_ADDR32:
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*reloc_addr = sym_val + addend;
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break;
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case R_PPC_COPY:
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memcpy(reloc_addr, (void *)sym_val, sym_size);
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break;
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case R_PPC_RELATIVE:
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*reloc_addr = (size_t)base_addr + addend;
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break;
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case R_PPC_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_PPC_DTPREL32:
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*reloc_addr = def.sym->st_value + addend;
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break;
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case R_PPC_TPREL32:
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*reloc_addr += def.sym
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? def.sym->st_value + def.dso->tls_offset - 0x7000
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: self->tls_offset - 0x7000;
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break;
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}
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}
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void __reloc_self(int c, size_t *a, size_t *dynv)
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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<20) t[*a] = a[1];
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n = t[DT_RELASZ];
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for (a=(void *)(base+t[DT_RELA]); n; a+=3, n-=12)
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if (a[1]%256 == R_PPC_RELATIVE)
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*(size_t *)(base+a[0]) = (size_t)base + a[2];
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}
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