forked from Imagelibrary/rtems
149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
/*
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* Taken from NetBSD and stripped of the relocations not needed on RTEMS.
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*/
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/* $NetBSD: mdreloc.c,v 1.26 2010/01/14 11:58:32 skrll Exp $ */
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#include <sys/cdefs.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <rtems/rtl/rtl.h>
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#include "rtl-elf.h"
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#include "rtl-error.h"
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#include "rtl-trace.h"
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static inline int overflow_8_check(int value)
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{
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if ((value & 0xffffff00) && (~value & 0xffffff80))
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return true;
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return false;
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}
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static inline int overflow_16_check(int value)
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{
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if ((value & 0xffff0000) && (~value & 0xffff8000))
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return true;
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return false;
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}
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bool
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rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
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{
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return true;
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}
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bool
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rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj,
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const Elf_Rela* rela,
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const rtems_rtl_obj_sect_t* sect,
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const char* symnane,
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const Elf_Byte syminfo,
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const Elf_Word symvalue)
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{
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Elf_Addr target = 0;
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Elf_Addr* where;
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Elf_Word tmp;
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where = (Elf_Addr *)(sect->base + rela->r_offset);
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switch (ELF_R_TYPE(rela->r_info)) {
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case R_TYPE(NONE):
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break;
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case R_TYPE(PC8):
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tmp = symvalue + rela->r_addend - (Elf_Addr)where;
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if (overflow_8_check(tmp))
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return false;
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*(uint8_t *)where = tmp;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
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printf ("rtl: reloc R_TYPE_8/PC8 in %s --> %p (%p) in %s\n",
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sect->name, (void*) (symvalue + rela->r_addend),
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(void *)*where, rtems_rtl_obj_oname (obj));
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break;
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case R_TYPE(PC16):
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tmp = symvalue + rela->r_addend - (Elf_Addr)where;
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if (overflow_16_check(tmp))
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return false;
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*(uint16_t*)where = tmp;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
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printf ("rtl: reloc R_TYPE_16/PC16 in %s --> %p (%p) in %s\n",
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sect->name, (void*) (symvalue + rela->r_addend),
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(void *)*where, rtems_rtl_obj_oname (obj));
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break;
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case R_TYPE(PC32):
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target = (Elf_Addr) symvalue + rela->r_addend;
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*where += target - (Elf_Addr)where;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
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printf ("rtl: reloc PC32 in %s --> %p (%p) in %s\n",
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sect->name, (void*) (symvalue + rela->r_addend),
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(void *)*where, rtems_rtl_obj_oname (obj));
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break;
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case R_TYPE(GOT32):
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case R_TYPE(32):
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case R_TYPE(GLOB_DAT):
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target = (Elf_Addr) symvalue + rela->r_addend;
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if (*where != target)
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*where = target;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
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printf ("rtl: reloc 32/GLOB_DAT in %s --> %p in %s\n",
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sect->name, (void *)*where,
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rtems_rtl_obj_oname (obj));
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break;
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case R_TYPE(RELATIVE):
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*where += (Elf_Addr) sect->base + rela->r_addend;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
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printf ("rtl: reloc RELATIVE in %s --> %p\n",
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rtems_rtl_obj_oname (obj), (void *)*where);
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break;
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case R_TYPE(COPY):
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/*
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* These are deferred until all other relocations have
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* been done. All we do here is make sure that the
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* COPY relocation is not in a shared library. They
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* are allowed only in executable files.
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*/
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printf ("rtl: reloc COPY (please report)\n");
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break;
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default:
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printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
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"contents = %p\n",
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ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info),
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(void *)rela->r_offset, (void *)*where);
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rtems_rtl_set_error (EINVAL,
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"%s: Unsupported relocation type %ld "
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"in non-PLT relocations",
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sect->name, (uint32_t) ELF_R_TYPE(rela->r_info));
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return false;
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}
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return true;
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}
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bool
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rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj,
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const Elf_Rel* rel,
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const rtems_rtl_obj_sect_t* sect,
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const char* symname,
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const Elf_Byte syminfo,
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const Elf_Word symvalue)
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{
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rtems_rtl_set_error (EINVAL, "rel type record not supported");
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return false;
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}
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