diff options
Diffstat (limited to 'cpukit/libdl/rtl-mdreloc-arm.c')
| -rw-r--r-- | cpukit/libdl/rtl-mdreloc-arm.c | 121 |
1 files changed, 107 insertions, 14 deletions
diff --git a/cpukit/libdl/rtl-mdreloc-arm.c b/cpukit/libdl/rtl-mdreloc-arm.c index 84d58e3d2d..f2f91f171c 100644 --- a/cpukit/libdl/rtl-mdreloc-arm.c +++ b/cpukit/libdl/rtl-mdreloc-arm.c @@ -10,11 +10,14 @@ #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> +#include <unwind.h> +#include <unwind-arm-common.h> #include <rtems/rtl/rtl.h> #include "rtl-elf.h" #include "rtl-error.h" #include "rtl-trace.h" +#include "rtl-unwind.h" /* * It is possible for the compiler to emit relocations for unaligned data. @@ -23,6 +26,8 @@ #define RELOC_ALIGNED_P(x) \ (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0) +#define SHT_ARM_EXIDX 0x70000001 /* Section holds ARM unwind info. */ + static inline Elf_Addr load_ptr(void *where) { @@ -56,9 +61,18 @@ static inline Elf_SOff sign_extend31(Elf_Addr val) { if (0x40000000 & val) - return ~((Elf_Addr)0x7fffffff) | (0x7fffffff & val); - else - return 0x7fffffff & val; + val = ~((Elf_Addr)0x7fffffff) | (0x7fffffff & val); + return 0x7fffffff & val; +} + +uint32_t +rtems_rtl_elf_section_flags (const rtems_rtl_obj_t* obj, + const Elf_Shdr* shdr) +{ + uint32_t flags = 0; + if (shdr->sh_type == SHT_ARM_EXIDX) + flags = RTEMS_RTL_OBJ_SECT_EH | RTEMS_RTL_OBJ_SECT_LOAD; + return flags; } bool @@ -96,8 +110,11 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, where = (Elf_Addr *)(sect->base + rel->r_offset); switch (ELF_R_TYPE(rel->r_info)) { - case R_TYPE(NONE): - break; + case R_TYPE(NONE): + if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) { + printf ("rtl: NONE %p in %s\n", where, rtems_rtl_obj_oname (obj)); + } + break; case R_TYPE(CALL): /* BL/BLX */ case R_TYPE(JUMP24): /* B/BL<cond> */ @@ -175,29 +192,31 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, case R_TYPE(ABS32): /* word32 (S + A) | T */ case R_TYPE(GLOB_DAT): /* word32 (S + A) | T */ case R_TYPE(PREL31): /* word32 (S + A) | T - P */ - case R_TYPE(TARGET2): /* Equivalent to ABS32 */ + case R_TYPE(TARGET2): /* Equivalent to REL32 */ 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)) + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32) || + ELF_R_TYPE(rel->r_info) == R_TYPE(TARGET2)) tmp -= (Elf_Addr)where; else if (ELF_R_TYPE(rel->r_info) == R_TYPE(PREL31)) - tmp -= sign_extend31((Elf_Addr)where); + tmp = sign_extend31(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)) + if (ELF_R_TYPE(rel->r_info) == R_TYPE(REL32) || + ELF_R_TYPE(rel->r_info) == R_TYPE(TARGET2)) tmp -= (Elf_Addr)where; else if (ELF_R_TYPE(rel->r_info) == R_TYPE(PREL31)) - tmp -= sign_extend31((Elf_Addr)where); + tmp = sign_extend31(tmp - (Elf_Addr)where); store_ptr(where, tmp); } if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) - printf ("rtl: REL32/ABS32/GLOB_DAT/PREL31/TARGET2 %p @ %p in %s", + printf ("rtl: REL32/ABS32/GLOB_DAT/PREL31/TARGET2 %p @ %p in %s\n", (void *)tmp, where, rtems_rtl_obj_oname (obj)); break; @@ -321,7 +340,7 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, (void *)*where, where, rtems_rtl_obj_oname (obj)); break; - default: + 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), @@ -330,9 +349,83 @@ rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj, "%s: Unsupported relocation type %ld " "in non-PLT relocations", sect->name, (uint32_t) ELF_R_TYPE(rel->r_info)); - return false; + return false; } - return true; + return true; +} + +bool +rtems_rtl_elf_unwind_parse (const rtems_rtl_obj_t* obj, + const char* name, + uint32_t flags) +{ + /* + * We location the EH sections in section flags. + */ + return false; +} + +bool +rtems_rtl_elf_unwind_register (rtems_rtl_obj_t* obj) +{ + return true; +} + +bool +rtems_rtl_elf_unwind_deregister (rtems_rtl_obj_t* obj) +{ + obj->loader = NULL; + return true; } +/* An exception index table entry. */ +typedef struct __EIT_entry +{ + _uw fnoffset; + _uw content; +} __EIT_entry; + +/* The exception index table location in the base module */ +extern __EIT_entry __exidx_start; +extern __EIT_entry __exidx_end; + +/* + * A weak reference is in libgcc, provide a real version and provide a way to + * manage loaded modules. + * + * Passed in the return address and a reference to the number of records + * found. We set the start of the exidx data and the number of records. + */ +_Unwind_Ptr __gnu_Unwind_Find_exidx (_Unwind_Ptr return_address, + int* nrec) __attribute__ ((__noinline__, + __used__, + __noclone__)); + +_Unwind_Ptr __gnu_Unwind_Find_exidx (_Unwind_Ptr return_address, + int* nrec) +{ + rtems_rtl_data_t* rtl; + rtems_chain_node* node; + __EIT_entry* exidx_start = &__exidx_start; + __EIT_entry* exidx_end = &__exidx_end; + + rtl = rtems_rtl_lock (); + + node = rtems_chain_first (&rtl->objects); + while (!rtems_chain_is_tail (&rtl->objects, node)) { + rtems_rtl_obj_t* obj = (rtems_rtl_obj_t*) node; + if (rtems_rtl_obj_text_inside (obj, (void*) return_address)) { + exidx_start = (__EIT_entry*) obj->eh_base; + exidx_end = (__EIT_entry*) (obj->eh_base + obj->eh_size); + break; + } + node = rtems_chain_next (node); + } + + rtems_rtl_unlock (); + + *nrec = exidx_end - exidx_start; + + return (_Unwind_Ptr) exidx_start; +} |