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https://github.com/tobast/libunwind-eh_elf.git
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Support .debug_frame based unwinding in _UPTi_find_unwind_table()
Signed-off-by: Andris Zeila <andris.zeila@accenture.com>
This commit is contained in:
parent
546463d1e7
commit
46e10c5abe
4 changed files with 39 additions and 8 deletions
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@ -119,6 +119,8 @@ typedef struct unw_addr_space *unw_addr_space_t;
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/* Each target may define it's own set of flags, but bits 0-15 are
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reserved for general libunwind-use. */
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#define UNW_PI_FLAG_FIRST_TDEP_BIT 16
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/* The information comes from a .debug_frame section. */
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#define UNW_PI_FLAG_DEBUG_FRAME 32
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typedef struct unw_proc_info
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{
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@ -895,13 +895,11 @@ dwarf_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
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#ifndef UNW_REMOTE_ONLY
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struct unw_debug_frame_list *fdesc = (void *) di->u.ti.table_data;
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/* UNW_INFO_FORMAT_TABLE (i.e. .debug_frame) is currently only
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supported for the local address space. Both the index and
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the unwind tables live in local memory, but the address space
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to check for properties like the address size and endianness
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is the target one. When the ptrace code adds support for
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.debug_frame something will have to change. */
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assert (as == unw_local_addr_space);
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/* UNW_INFO_FORMAT_TABLE (i.e. .debug_frame) is read from local address
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space. Both the index and the unwind tables live in local memory, but
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the address space to check for properties like the address size and
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endianness is the target one. */
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as = unw_local_addr_space;
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table = fdesc->index;
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table_len = fdesc->index_size * sizeof (struct table_entry);
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debug_frame_base = (uintptr_t) fdesc->debug_frame;
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@ -958,6 +956,7 @@ dwarf_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
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{
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pi->start_ip += segbase;
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pi->end_ip += segbase;
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pi->flags = UNW_PI_FLAG_DEBUG_FRAME;
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}
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if (ip < pi->start_ip || ip >= pi->end_ip)
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@ -73,6 +73,12 @@ run_cfi_program (struct dwarf_cursor *c, dwarf_state_record_t *sr,
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as = c->as;
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arg = c->as_arg;
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if (c->pi.flags & UNW_PI_FLAG_DEBUG_FRAME)
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{
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/* .debug_frame CFI is stored in local address space. */
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as = unw_local_addr_space;
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arg = NULL;
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}
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a = unw_get_accessors (as);
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curr_ip = c->pi.start_ip;
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@ -210,7 +210,31 @@ _UPTi_find_unwind_table (struct UPT_info *ui, unw_addr_space_t as,
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}
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}
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if (!ptxt || !peh_hdr)
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{
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/* No .eh_frame found, try .debug_frame. */
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struct dl_phdr_info info;
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info.dlpi_name = path;
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info.dlpi_phdr = phdr;
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info.dlpi_phnum = ehdr->e_phnum;
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/* Fixup segbase to match correct base address. */
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for (i = 0; i < info.dlpi_phnum; i++)
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{
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if (info.dlpi_phdr[i].p_type == PT_LOAD &&
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info.dlpi_phdr[i].p_offset == 0)
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{
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segbase -= info.dlpi_phdr[i].p_vaddr;
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break;
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}
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}
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info.dlpi_addr = segbase;
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if (dwarf_find_debug_frame (0, &ui->di_cache, &info, ip))
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return &ui->di_cache;
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else
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return NULL;
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}
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if (pdyn)
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{
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