mirror of
https://github.com/tobast/libunwind-eh_elf.git
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3842dac733
reading of .debug_frame sections (used in lieu of .eh_frame sections when they're not available).
127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
#ifndef REMOTE_H
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#define REMOTE_H
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/* Helper functions for accessing (remote) memory. These functions
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assume that all addresses are naturally aligned (e.g., 32-bit
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quantity is stored at a 32-bit-aligned address. */
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#ifdef UNW_LOCAL_ONLY
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static inline int
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fetch8 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int8_t *valp, void *arg)
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{
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*valp = *(int8_t *) (uintptr_t) *addr;
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*addr += 1;
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return 0;
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}
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static inline int
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fetch16 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int16_t *valp, void *arg)
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{
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*valp = *(int16_t *) (uintptr_t) *addr;
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*addr += 2;
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return 0;
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}
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static inline int
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fetch32 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int32_t *valp, void *arg)
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{
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*valp = *(int32_t *) (uintptr_t) *addr;
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*addr += 4;
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return 0;
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}
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static inline int
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fetchw (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, unw_word_t *valp, void *arg)
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{
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*valp = *(unw_word_t *) (uintptr_t) *addr;
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*addr += sizeof (unw_word_t);
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return 0;
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}
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#else /* !UNW_LOCAL_ONLY */
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#define WSIZE (sizeof (unw_word_t))
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static inline int
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fetch8 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int8_t *valp, void *arg)
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{
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unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
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int ret;
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*addr += 1;
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ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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val >>= 8*off;
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#else
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val >>= 8*(WSIZE - 1 - off);
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#endif
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*valp = val & 0xff;
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return ret;
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}
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static inline int
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fetch16 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int16_t *valp, void *arg)
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{
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unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
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int ret;
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assert ((off & 0x1) == 0);
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*addr += 2;
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ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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val >>= 8*off;
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#else
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val >>= 8*(WSIZE - 2 - off);
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#endif
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*valp = val & 0xffff;
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return ret;
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}
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static inline int
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fetch32 (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, int32_t *valp, void *arg)
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{
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unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
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int ret;
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assert ((off & 0x3) == 0);
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*addr += 4;
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ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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val >>= 8*off;
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#else
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val >>= 8*(WSIZE - 4 - off);
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#endif
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*valp = val & 0xffffffff;
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return ret;
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}
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static inline int
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fetchw (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, unw_word_t *valp, void *arg)
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{
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int ret;
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ret = (*a->access_mem) (as, *addr, valp, 0, arg);
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*addr += WSIZE;
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return ret;
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}
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#endif /* !UNW_LOCAL_ONLY */
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#endif /* REMOTE_H */
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