diff options
author | Peng Fan <van.freenix@gmail.com> | 2013-07-24 15:49:29 +0800 |
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committer | Peng Fan <van.freenix@gmail.com> | 2013-09-05 13:47:39 +0800 |
commit | 400bce45a8532b2377c5692da80666196ce09c64 (patch) | |
tree | 950266e0af9ba23ed722bc8ba2996ff71d9a2b08 /rtl-mdreloc-lm32.c | |
parent | 42d16f6d37130a3550b537d35698977f06908234 (diff) |
LM32 Support
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Diffstat (limited to 'rtl-mdreloc-lm32.c')
-rw-r--r-- | rtl-mdreloc-lm32.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/rtl-mdreloc-lm32.c b/rtl-mdreloc-lm32.c new file mode 100644 index 0000000..f6499df --- /dev/null +++ b/rtl-mdreloc-lm32.c @@ -0,0 +1,120 @@ +#include <sys/cdefs.h> + +#include <errno.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> + +#include <rtl.h> +#include "rtl-elf.h" +#include "rtl-error.h" +#include <rtl-trace.h> + +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 *where; + Elf32_Word tmp; + Elf32_Word insn; + + + where = (Elf_Addr *)(sect->base + rela->r_offset); + + switch (ELF_R_TYPE(rela->r_info)) { + case R_TYPE(NONE): + break; + + case R_TYPE(HI16): + insn = *where; + /* orhi/mvhi instruction + * 31--------26|25-21|20-16|15----0| + * |0 1 1 1 1 0 |rY |rX |imm16 | + */ + if (0x1e == (insn >> 26)) { + insn &= 0xffff0000; + insn |= ((symvalue + rela->r_addend) >> 16); + *where = insn; + } + break; + + case R_TYPE(LO16): + insn = *where; + /* ori instruction + * 31--------26|25-21|20-16|15----0| + * |0 0 1 1 1 0 |rY |rX |imm16 | + */ + if (0xe == (insn >> 26)) { + insn &= 0xffff0000; + insn |= ((symvalue + rela->r_addend) & 0xffff); + *where = insn; + } + break; + + case R_TYPE(CALL): + insn = *where; + /* + * calli instruction + * 31-------26|25---0| + * |1 1 1 1 1 0|imm26 | + * Syntax: call imm26 + * Operation: ra = pc + 4; pc = pc + sign_extend(imm26<<2) + */ + if (0x3e == (insn >> 26)) { + Elf_Sword imm26 = symvalue +rela->r_addend - (Elf_Addr)where; + imm26 = (imm26 >> 2) & 0x3ffffff; + insn = 0xf8000000 + imm26; + *where = insn; + } + break; + + case R_TYPE(BRANCH): + insn = *where; + tmp = symvalue + rela->r_addend - (Elf_Addr)where; + tmp = (Elf32_Sword)tmp >> 2; + if (((Elf32_Sword)tmp > 0x7fff) || ((Elf32_Sword)tmp < -0x8000)){ + printf("BRANCH Overflow\n"); + return false; + } + + *where = (*where & 0xffff0000) | (tmp & 0xffff); + break; + + case R_TYPE(32): + *where = symvalue + rela->r_addend; + break; + + default: + rtems_rtl_set_error (EINVAL, "rela type record not supported"); + printf("Unsupported reloc types\n"); + return false; + } + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf("rela relocation type is %ld\n", ELF_R_TYPE(rela->r_info)); + printf("relocated address 0x%08lx\n", (Elf_Addr)where); + } + 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) +{ + rtems_rtl_set_error (EINVAL, "rela type record not supported"); + return false; +} |