diff options
Diffstat (limited to 'cpukit/libdl/rtl-mdreloc-powerpc.c')
| -rw-r--r-- | cpukit/libdl/rtl-mdreloc-powerpc.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/cpukit/libdl/rtl-mdreloc-powerpc.c b/cpukit/libdl/rtl-mdreloc-powerpc.c new file mode 100644 index 0000000000..d1c0a4fa4e --- /dev/null +++ b/cpukit/libdl/rtl-mdreloc-powerpc.c @@ -0,0 +1,186 @@ +/* + * Taken from NetBSD and stripped of the relocations not needed on RTEMS. + */ + +/* $NetBSD: ppc_reloc.c,v 1.44 2010/01/13 20:17:22 christos Exp $ */ + +#include <sys/cdefs.h> + +#include <errno.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include <rtems/rtl/rtl.h> +#include "rtl-elf.h" +#include "rtl-error.h" +#include "rtl-trace.h" + +#define ha(x) ((((u_int32_t)(x) & 0x8000) ? \ + ((u_int32_t)(x) + 0x10000) : (u_int32_t)(x)) >> 16) +#define l(x) ((u_int32_t)(x) & 0xffff) + + +bool +rtems_rtl_elf_rel_resolve_sym (Elf_Word type) +{ + return true; +} + +bool +rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj, + const Elf_Rela* rela, + const rtems_rtl_obj_sect_t* sect, + const char* symname, + const Elf_Byte syminfo, + const Elf_Word symvalue) +{ + Elf_Addr target = 0; + Elf_Addr* where; + Elf_Word tmp; + uint32_t mask = 0; + uint32_t bits = 0; + + where = (Elf_Addr *)(sect->base + rela->r_offset); + switch (ELF_R_TYPE(rela->r_info)) { + case R_TYPE(NONE): + break; + + case R_TYPE(32): + /* + * value:1; Field: word32; Expression: S + A + */ + *where = symvalue + rela->r_addend; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: ADDR32 %p @ %p in %s\n", + (void *)*(where), where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(14): + /* + * value:7; Field: low14*; Expression: (S + A) >> 2 + */ + case R_TYPE(24): + /* + * value:2; Field: low24*; Expression: (S + A) >> 2 + */ + if (ELF_R_TYPE(rela->r_info) == R_TYPE(14)) { + bits = 14; + mask = 0xfffc; + } else { + bits = 24; + mask = 0x3fffffc; + } + tmp = (symvalue + rela->r_addend) >> 2; + if (tmp > (1<<bits -1 )) { + printf("Overflow ADDR14/ADDR24\n"); + return false; + } + tmp = *where; + tmp &= ~mask; + tmp |= (symvalue + rela->r_addend) & mask; + *where = tmp; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: ADDR14/ADDR24 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(16_HA): + /* + * value:6; Field:half16; Expression: #ha(S+A) + */ + + tmp = symvalue + rela->r_addend; + *(uint16_t *)where = (((tmp >> 16) + ((tmp & 0x8000) ? 1: 0)) & 0xffff); + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: 16_HA %p @ %p in %s\n", + (void *)*(where), where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(16_HI): + /* + * value:5; Field:half16; Expression: #hi(S+A) + */ + *(uint16_t *)where = ((symvalue + rela->r_addend) >> 16) & 0xffff; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: 16_HI %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + case R_TYPE(16_LO): + /* + * value:4; Field:half16; Expression: #lo(S+A) + */ + *(uint16_t *)where = (symvalue + (rela->r_addend)) & 0xffff; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: 16_LO %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(REL14): + /* + * value:11; Field:low14*; Expression:(S+A-P)>>2 + */ + case R_TYPE(REL24): + /* + * value:10; Field:low24*; Expression:(S+A-P)>>2 + */ + if (ELF_R_TYPE(rela->r_info) == R_TYPE(REL24)) { + mask = 0x3fffffc; + bits = 24; + } + else if (ELF_R_TYPE(rela->r_info) == R_TYPE(REL14)) { + mask = 0xfffc; + bits = 14; + } + + tmp =((int) (symvalue + rela->r_addend - (Elf_Addr)where)) >> 2; + if (((Elf_Sword)tmp > ((1<<(bits-1)) - 1)) || + ((Elf_Sword)tmp < -(1<<(bits-1)))) { + printf("Overflow REL14/REL24\n"); + return false; + } + + tmp = *where; + tmp &= ~mask; + tmp |= (symvalue + rela->r_addend - (Elf_Addr)where) & mask; + *where = tmp; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: REL24/REL14 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(REL32): + /* + * value:26; Field:word32*; Expression:S+A-P + */ + *where = symvalue + rela->r_addend - (Elf_Addr)where; + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: REL32 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + default: + printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, " + "contents = %p\n", + ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info), + (void *)rela->r_offset, (void *)*where); + rtems_rtl_set_error (EINVAL, + "%s: Unsupported relocation type %ld " + "in non-PLT relocations", + sect->name, (uint32_t) ELF_R_TYPE(rela->r_info)); + return false; + } + return true; +} + +bool +rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, + const Elf_Rel* rel, + const rtems_rtl_obj_sect_t* sect, + const char* symname, + const Elf_Byte syminfo, + const Elf_Word symvalue) +{ + printf ("rtl: rel type record not supported; please report\n"); + return false; +} |