diff options
Diffstat (limited to 'gdb/elfread.c')
| -rw-r--r-- | gdb/elfread.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/gdb/elfread.c b/gdb/elfread.c index 115251c..68bed7e 100644 --- a/gdb/elfread.c +++ b/gdb/elfread.c @@ -41,6 +41,8 @@ #include "gdbtypes.h" #include "value.h" #include "infcall.h" +#include "gdbthread.h" +#include "regcache.h" extern void _initialize_elfread (void); @@ -948,6 +950,111 @@ elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc) return address; } +/* Handle inferior hit of bp_gnu_ifunc_resolver, see its definition. */ + +static void +elf_gnu_ifunc_resolver_stop (struct breakpoint *b) +{ + struct breakpoint *b_return; + struct frame_info *prev_frame = get_prev_frame (get_current_frame ()); + struct frame_id prev_frame_id = get_stack_frame_id (prev_frame); + CORE_ADDR prev_pc = get_frame_pc (prev_frame); + int thread_id = pid_to_thread_id (inferior_ptid); + + gdb_assert (b->type == bp_gnu_ifunc_resolver); + + for (b_return = b->related_breakpoint; b_return != b; + b_return = b_return->related_breakpoint) + { + gdb_assert (b_return->type == bp_gnu_ifunc_resolver_return); + gdb_assert (b_return->loc != NULL && b_return->loc->next == NULL); + gdb_assert (frame_id_p (b_return->frame_id)); + + if (b_return->thread == thread_id + && b_return->loc->requested_address == prev_pc + && frame_id_eq (b_return->frame_id, prev_frame_id)) + break; + } + + if (b_return == b) + { + struct symtab_and_line sal; + + /* No need to call find_pc_line for symbols resolving as this is only + a helper breakpointer never shown to the user. */ + + init_sal (&sal); + sal.pspace = current_inferior ()->pspace; + sal.pc = prev_pc; + sal.section = find_pc_overlay (sal.pc); + sal.explicit_pc = 1; + b_return = set_momentary_breakpoint (get_frame_arch (prev_frame), sal, + prev_frame_id, + bp_gnu_ifunc_resolver_return); + + /* Add new b_return to the ring list b->related_breakpoint. */ + gdb_assert (b_return->related_breakpoint == b_return); + b_return->related_breakpoint = b->related_breakpoint; + b->related_breakpoint = b_return; + } +} + +/* Handle inferior hit of bp_gnu_ifunc_resolver_return, see its definition. */ + +static void +elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b) +{ + struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); + struct type *func_func_type = builtin_type (gdbarch)->builtin_func_func; + struct type *value_type = TYPE_TARGET_TYPE (func_func_type); + struct regcache *regcache = get_thread_regcache (inferior_ptid); + struct value *value; + CORE_ADDR resolved_address, resolved_pc; + struct symtab_and_line sal; + struct symtabs_and_lines sals; + + gdb_assert (b->type == bp_gnu_ifunc_resolver_return); + + value = allocate_value (value_type); + gdbarch_return_value (gdbarch, func_func_type, value_type, regcache, + value_contents_raw (value), NULL); + resolved_address = value_as_address (value); + resolved_pc = gdbarch_convert_from_func_ptr_addr (gdbarch, + resolved_address, + ¤t_target); + + while (b->related_breakpoint != b) + { + struct breakpoint *b_next = b->related_breakpoint; + + switch (b->type) + { + case bp_gnu_ifunc_resolver: + break; + case bp_gnu_ifunc_resolver_return: + delete_breakpoint (b); + break; + default: + internal_error (__FILE__, __LINE__, + _("handle_inferior_event: Invalid " + "gnu-indirect-function breakpoint type %d"), + (int) b->type); + } + b = b_next; + } + gdb_assert (b->type == bp_gnu_ifunc_resolver); + + gdb_assert (current_program_space == b->pspace); + elf_gnu_ifunc_record_cache (b->addr_string, resolved_pc); + + sal = find_pc_line (resolved_pc, 0); + sals.nelts = 1; + sals.sals = &sal; + + b->type = bp_breakpoint; + update_breakpoint_locations (b, sals); +} + struct build_id { size_t size; @@ -1502,6 +1609,8 @@ static const struct gnu_ifunc_fns elf_gnu_ifunc_fns = { elf_gnu_ifunc_resolve_addr, elf_gnu_ifunc_resolve_name, + elf_gnu_ifunc_resolver_stop, + elf_gnu_ifunc_resolver_return_stop }; void |