diff options
Diffstat (limited to 'cpukit/libdl/rtl-mdreloc-arm.c')
| -rw-r--r-- | cpukit/libdl/rtl-mdreloc-arm.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/cpukit/libdl/rtl-mdreloc-arm.c b/cpukit/libdl/rtl-mdreloc-arm.c new file mode 100644 index 0000000000..692c8297a8 --- /dev/null +++ b/cpukit/libdl/rtl-mdreloc-arm.c @@ -0,0 +1,323 @@ +/* + * Taken from NetBSD and stripped of the relocations not needed on RTEMS. + */ + +/* $NetBSD: mdreloc.c,v 1.33 2010/01/14 12:12:07 skrll 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" + +/* + * It is possible for the compiler to emit relocations for unaligned data. + * We handle this situation with these inlines. + */ +#define RELOC_ALIGNED_P(x) \ + (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0) + +static inline Elf_Addr +load_ptr(void *where) +{ + Elf_Addr res; + + memcpy(&res, where, sizeof(res)); + + return (res); +} + +static inline void +store_ptr(void *where, Elf_Addr val) +{ + + memcpy(where, &val, sizeof(val)); +} + +/* + * The address of Thumb function symbols is it's real address plus one. + * This is done by compiler, thus do not consider symtype here. + */ +static inline int +isThumb(Elf_Word symvalue) +{ + if ((symvalue & 0x1) == 0x1) + return true; + else return false; +} + +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) +{ + rtems_rtl_set_error (EINVAL, "rela type record not supported"); + return false; +} + +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) +{ + Elf_Addr *where; + Elf_Addr tmp; + Elf_Word insn, addend; + Elf_Word sign, i1, i2; + uint16_t lower_insn, upper_insn; + + where = (Elf_Addr *)(sect->base + rel->r_offset); + + switch (ELF_R_TYPE(rel->r_info)) { + case R_TYPE(NONE): + break; + + case R_TYPE(CALL): /* BL/BLX */ + case R_TYPE(JUMP24): /* B/BL<cond> */ + insn = *where; + + if (insn & 0x00800000) + addend = insn | 0xff000000; + else addend = insn & 0x00ffffff; + + if (isThumb(symvalue)) { + if ((insn & 0xfe000000) == 0xfa000000); /* Already blx */ + else { + if ((insn & 0xff000000) == 0xeb000000) { /* BL <label> */ + *where = (insn & 0x00ffffff) | 0xfa000000; /* BL-->BLX */ + } else { + printf("JUMP24 is not suppored from arm to thumb\n"); + return false; + } + } + } + + tmp = symvalue + (addend << 2) - (Elf_Addr)where; + tmp = (Elf_Sword)tmp >> 2; + + if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { + printf("CALL/JUMP24 Overflow\n"); + return false; + } + + *where = (*where & 0xff000000) | (tmp & 0xffffff); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: JUMP24/PC24/CALL %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + + break; + + case R_TYPE(V4BX): + /* Miscellaneous, ignore */ + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf ("rtl: V4BX %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + break; + + case R_TYPE(MOVT_ABS): + case R_TYPE(MOVW_ABS_NC): + insn = *where; + + addend = ((insn >> 4) & 0xf000) | (insn & 0x0fff); + if (addend & 0x8000) + addend |= 0xffff0000; + + tmp = symvalue + addend; + + if (ELF_R_TYPE(rel->r_info) == R_TYPE(MOVW_ABS_NC)) + tmp &= 0xffff; + else { + tmp = (Elf_Sword)tmp >> 16; + if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) { + printf("MOVT_ABS Overflow\n"); + return false; + } + } + + *where = (insn & 0xfff0f000) | ((tmp & 0xf000) << 4) | (tmp & 0xfff); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: MOVT_ABS/MOVW_ABS_NC %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + break; + + + case R_TYPE(REL32): /* word32 (S + A) | T - P */ + case R_TYPE(ABS32): /* word32 (S + A) | T */ + case R_TYPE(GLOB_DAT): /* word32 (S + A) | T */ + if (__predict_true(RELOC_ALIGNED_P(where))) { + tmp = *where + symvalue; + if (isThumb(symvalue)) + tmp |= 1; + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32)) + tmp -= (Elf_Addr)where; + *where = tmp; + } else { + tmp = load_ptr(where) + symvalue; + if (isThumb(symvalue)) + tmp |= 1; + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32)) + tmp -= (Elf_Addr)where; + store_ptr(where, tmp); + } + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: REL32/ABS32/GLOB_DAT %p @ %p in %s", + (void *)tmp, where, rtems_rtl_obj_oname (obj)); + break; + + case R_TYPE(THM_MOVT_ABS): + case R_TYPE(THM_MOVW_ABS_NC): + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + + addend = ((upper_insn & 0x000f) << 12) | ((upper_insn & 0x0400) << 1) | + ((lower_insn & 0x7000) >> 4) | (lower_insn & 0x00ff); + addend = (addend ^ 0x8000) - 0x8000; + + tmp = addend + symvalue; + if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS) + tmp >>= 16; + + *(uint16_t *)where = (uint16_t)((upper_insn & 0xfbf0) | + ((tmp & 0xf000) >> 12) | + ((tmp & 0x0800) >> 1)); + *((uint16_t *)where + 1) = (uint16_t)((lower_insn & 0x8f00) | + ((tmp & 0x0700) << 4) | + (tmp & 0x00ff)); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf ("rtl: THM_MOVT_ABS/THM_MOVW_ABS_NC %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + + break; + + case R_TYPE(THM_JUMP24): + /* same to THM_CALL; insn b.w */ + case R_TYPE(THM_CALL): + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + sign = (upper_insn & (1 << 10)) >> 10; + i1 = ((lower_insn >> 13) & 1) ^ sign ? 0 : 1; + i2 = ((lower_insn >> 11) & 1) ^ sign ? 0 : 1; + tmp = (i1 << 23) | (i2 << 22) | ((upper_insn & 0x3ff) << 12) | ((lower_insn & 0x7ff) << 1); + addend = (tmp | ((sign ? 0 : 1) << 24)) - (1 << 24); + + if (isThumb(symvalue)) ;/*Thumb to Thumb call, nothing to care */ + else { + if (ELF_R_TYPE(rel->r_info) == R_TYPE(THM_JUMP24)) { + tmp = (tmp + 2) & ~3; /* aligned to 4 bytes only for JUMP24 */ + printf("THM_JUMP24 to arm not supported\n"); + return false; + } + else { + /* THM_CALL bl-->blx */ + lower_insn &=~(1<<12); + } + } + + tmp = symvalue + addend; + tmp = tmp - (Elf_Addr)where; + + if (((Elf_Sword)tmp > 0x7fffff) || ((Elf_Sword)tmp < -0x800000)) { + printf("THM_CALL/JUMP24 overflow\n"); + return false; + } + + sign = (tmp >> 24) & 1; + *(uint16_t *)where = (uint16_t)((upper_insn & 0xf800) | (sign << 10) | + ((tmp >> 12) & 0x3ff)); + + *((uint16_t *)where + 1) = (uint16_t)((lower_insn & 0xd000)| + ((sign ^ (~(tmp >> 23) & 1)) << 13) | + ((sign ^ (~(tmp >> 22) & 1)) << 11) | + ((tmp >> 1) & 0x7ff)); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)){ + printf ("rtl: THM_CALL/JUMP24 %p @ %p in %s\n", + (void *)*where, where, rtems_rtl_obj_oname (obj)); + } + + break; + + case R_TYPE(THM_JUMP19): + + if (!isThumb(symvalue)) { + printf("THM_JUMP19 to arm not supported\n"); + return false; + } + + upper_insn = *(uint16_t *)where; + lower_insn = *((uint16_t *)where + 1); + sign = (upper_insn >> 10) & 0x1; + + if ((((upper_insn & 0x3f) >> 7) & 0x7) == 0x7) { + printf("THM_JUMP19 failed\n"); + return false; /*if cond <3:1> == '111', see Related codings in armv7a manual */ + } + + i1 = (lower_insn >> 13) & 0x1; + i2 = (lower_insn >> 11) & 0x1; + + tmp = ((i2 << 19) | (i1 << 18) | ((upper_insn & 0x3f) << 12) | ((lower_insn & 0x7ff) << 1)); + addend = (tmp | ((sign ? 0 : 1) << 20)) - (1 << 20); + tmp = symvalue + addend; + + tmp = tmp - (Elf_Addr)where; + + if (((Elf_Sword)tmp > 0x7ffffe) || ((Elf_Sword)tmp < -0x800000)) { + rtems_rtl_set_error (EINVAL, "%s: Overflow %ld " + "THM_JUMP19 relocations", + sect->name, (uint32_t) ELF_R_TYPE(rel->r_info)); + return false; + } + + sign = (tmp >> 20) & 0x1; + i2 = (tmp >> 19) & 0x1; + i1 = (tmp >> 18) & 0x1; + + *(uint16_t*)where = (upper_insn & 0xfbc0) | (sign << 10) | ((tmp >> 12) & 0x3f); + *((uint16_t*)where + 1) = (lower_insn & 0xd000) | (i1 << 13) | + (i2 << 11) | ((tmp >> 1) & 0x7ff); + + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) + printf ("rtl: THM_JUMP19 %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(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info), + (void *)rel->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(rel->r_info)); + return false; + } + + return true; +} + |