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https://github.com/tobast/libunwind-eh_elf.git
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Capture the address of the first byte after the instructionless gap
that follows the procedure.
This commit is contained in:
parent
06d230d732
commit
bbdc4b12da
3 changed files with 23 additions and 5 deletions
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@ -31,6 +31,12 @@ following members:
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instruction \emph{beyond} the end of the procedure. If this address
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cannot be determined (e.g., due to lack of unwind information),
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the \Var{end\_ip} member is cleared to 0. \\
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\item[\Type{unw\_word\_t} \Var{last\_ip}] The address of the first
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instruction that could begin another procedure. Addresses from
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end\_ip up to last\_ip are addresses where there are no
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instructions. If this address cannot be determined (e.g., due to
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lack of unwind information), the \Var{end\_ip} member is cleared to
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0. \\
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\item[\Type{unw\_word\_t} \Var{lsda}] The address of the
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language-specific data-area (LSDA). This area normally contains
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language-specific information needed during exception handling. If
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@ -126,6 +126,7 @@ typedef struct unw_proc_info
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{
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unw_word_t start_ip; /* first IP covered by this procedure */
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unw_word_t end_ip; /* first IP NOT covered by this procedure */
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unw_word_t last_ip; /* first IP that could begin another procedure */
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unw_word_t lsda; /* address of lang.-spec. data area (if any) */
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unw_word_t handler; /* optional personality routine */
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unw_word_t gp; /* global-pointer value for this procedure */
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@ -742,7 +742,7 @@ lookup (const struct table_entry *table, size_t table_size, int32_t rel_ip)
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static int
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remote_lookup (unw_addr_space_t as,
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unw_word_t table, size_t table_size, int32_t rel_ip,
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struct table_entry *e, void *arg)
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struct table_entry *e, int32_t *last_ip_offset, void *arg)
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{
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unsigned long table_len = table_size / sizeof (struct table_entry);
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unw_accessors_t *a = unw_get_accessors (as);
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@ -768,7 +768,9 @@ remote_lookup (unw_addr_space_t as,
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return 0;
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e_addr = table + (hi - 1) * sizeof (struct table_entry);
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if ((ret = dwarf_reads32 (as, a, &e_addr, &e->start_ip_offset, arg)) < 0
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|| (ret = dwarf_reads32 (as, a, &e_addr, &e->fde_offset, arg)) < 0)
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|| (ret = dwarf_reads32 (as, a, &e_addr, &e->fde_offset, arg)) < 0
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|| (hi < table_len &&
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(ret = dwarf_reads32 (as, a, &e_addr, last_ip_offset, arg)) < 0))
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return ret;
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return 1;
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}
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@ -787,7 +789,7 @@ dwarf_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
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int need_unwind_info, void *arg)
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{
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const struct table_entry *e = NULL, *table;
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unw_word_t ip_base = 0, segbase = 0, fde_addr;
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unw_word_t ip_base = 0, segbase = 0, last_ip, fde_addr;
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unw_accessors_t *a;
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#ifndef UNW_LOCAL_ONLY
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struct table_entry ent;
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@ -840,17 +842,25 @@ dwarf_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
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if (as == unw_local_addr_space)
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{
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e = lookup (table, table_len, ip - ip_base);
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if (e && &e[1] < &table[table_len])
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last_ip = e[1].start_ip_offset + ip_base;
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else
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last_ip = di->end_ip;
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}
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else
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#endif
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{
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#ifndef UNW_LOCAL_ONLY
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int32_t last_ip_offset = di->end_ip - ip_base;
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segbase = di->u.rti.segbase;
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if ((ret = remote_lookup (as, (uintptr_t) table, table_len,
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ip - ip_base, &ent, arg)) < 0)
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ip - ip_base, &ent, &last_ip_offset, arg)) < 0)
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return ret;
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if (ret)
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e = &ent;
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{
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e = &ent;
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last_ip = last_ip_offset + ip_base;
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}
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else
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e = NULL; /* no info found */
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#endif
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@ -888,6 +898,7 @@ dwarf_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
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pi->flags = UNW_PI_FLAG_DEBUG_FRAME;
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}
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pi->last_ip = last_ip;
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if (ip < pi->start_ip || ip >= pi->end_ip)
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return -UNW_ENOINFO;
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