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-rw-r--r--gdb/breakpoint.c98
1 files changed, 87 insertions, 11 deletions
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 1a9d963..c300df9 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -3504,6 +3504,8 @@ print_it_typical (bpstat bs)
case bp_tracepoint:
case bp_fast_tracepoint:
case bp_jit_event:
+ case bp_gnu_ifunc_resolver:
+ case bp_gnu_ifunc_resolver_return:
default:
result = PRINT_UNKNOWN;
break;
@@ -4378,7 +4380,7 @@ handle_jit_event (void)
/* Decide what infrun needs to do with this bpstat. */
struct bpstat_what
-bpstat_what (bpstat bs)
+bpstat_what (bpstat bs_head)
{
struct bpstat_what retval;
/* We need to defer calling `solib_add', as adding new symbols
@@ -4386,12 +4388,13 @@ bpstat_what (bpstat bs)
and hence may clear unprocessed entries in the BS chain. */
int shlib_event = 0;
int jit_event = 0;
+ bpstat bs;
retval.main_action = BPSTAT_WHAT_KEEP_CHECKING;
retval.call_dummy = STOP_NONE;
retval.is_longjmp = 0;
- for (; bs != NULL; bs = bs->next)
+ for (bs = bs_head; bs != NULL; bs = bs->next)
{
/* Extract this BS's action. After processing each BS, we check
if its action overrides all we've seem so far. */
@@ -4521,6 +4524,16 @@ bpstat_what (bpstat bs)
out already. */
internal_error (__FILE__, __LINE__,
_("bpstat_what: tracepoint encountered"));
+ break;
+ case bp_gnu_ifunc_resolver:
+ /* Step over it (and insert bp_gnu_ifunc_resolver_return). */
+ this_action = BPSTAT_WHAT_SINGLE;
+ break;
+ case bp_gnu_ifunc_resolver_return:
+ /* The breakpoint will be removed, execution will restart from the
+ PC of the former breakpoint. */
+ this_action = BPSTAT_WHAT_KEEP_CHECKING;
+ break;
default:
internal_error (__FILE__, __LINE__,
_("bpstat_what: unhandled bptype %d"), (int) bptype);
@@ -4529,6 +4542,9 @@ bpstat_what (bpstat bs)
retval.main_action = max (retval.main_action, this_action);
}
+ /* These operations may affect the bs->breakpoint_at state so they are
+ delayed after MAIN_ACTION is decided above. */
+
if (shlib_event)
{
if (debug_infrun)
@@ -4558,6 +4574,23 @@ bpstat_what (bpstat bs)
handle_jit_event ();
}
+ for (bs = bs_head; bs != NULL; bs = bs->next)
+ {
+ struct breakpoint *b = bs->breakpoint_at;
+
+ if (b == NULL)
+ continue;
+ switch (b->type)
+ {
+ case bp_gnu_ifunc_resolver:
+ gnu_ifunc_resolver_stop (b);
+ break;
+ case bp_gnu_ifunc_resolver_return:
+ gnu_ifunc_resolver_return_stop (b);
+ break;
+ }
+ }
+
return retval;
}
@@ -4715,6 +4748,8 @@ bptype_string (enum bptype type)
{bp_fast_tracepoint, "fast tracepoint"},
{bp_static_tracepoint, "static tracepoint"},
{bp_jit_event, "jit events"},
+ {bp_gnu_ifunc_resolver, "STT_GNU_IFUNC resolver"},
+ {bp_gnu_ifunc_resolver_return, "STT_GNU_IFUNC resolver return"},
};
if (((int) type >= (sizeof (bptypes) / sizeof (bptypes[0])))
@@ -4849,6 +4884,8 @@ print_one_breakpoint_location (struct breakpoint *b,
case bp_fast_tracepoint:
case bp_static_tracepoint:
case bp_jit_event:
+ case bp_gnu_ifunc_resolver:
+ case bp_gnu_ifunc_resolver_return:
if (opts.addressprint)
{
annotate_field (4);
@@ -5124,7 +5161,8 @@ user_settable_breakpoint (const struct breakpoint *b)
|| b->type == bp_catchpoint
|| b->type == bp_hardware_breakpoint
|| is_tracepoint (b)
- || is_watchpoint (b));
+ || is_watchpoint (b)
+ || b->type == bp_gnu_ifunc_resolver);
}
/* Return true if this breakpoint was set by the user, false if it is
@@ -5620,6 +5658,8 @@ allocate_bp_location (struct breakpoint *bpt)
case bp_longjmp_master:
case bp_std_terminate_master:
case bp_exception_master:
+ case bp_gnu_ifunc_resolver:
+ case bp_gnu_ifunc_resolver_return:
loc->loc_type = bp_loc_software_breakpoint;
break;
case bp_hardware_breakpoint:
@@ -5726,9 +5766,12 @@ set_raw_breakpoint_without_location (struct gdbarch *gdbarch,
return b;
}
-/* Initialize loc->function_name. */
+/* Initialize loc->function_name. EXPLICIT_LOC says no indirect function
+ resolutions should be made as the user specified the location explicitly
+ enough. */
+
static void
-set_breakpoint_location_function (struct bp_location *loc)
+set_breakpoint_location_function (struct bp_location *loc, int explicit_loc)
{
gdb_assert (loc->owner != NULL);
@@ -5736,8 +5779,33 @@ set_breakpoint_location_function (struct bp_location *loc)
|| loc->owner->type == bp_hardware_breakpoint
|| is_tracepoint (loc->owner))
{
- find_pc_partial_function (loc->address, &(loc->function_name),
- NULL, NULL);
+ int is_gnu_ifunc;
+
+ find_pc_partial_function_gnu_ifunc (loc->address, &loc->function_name,
+ NULL, NULL, &is_gnu_ifunc);
+
+ if (is_gnu_ifunc && !explicit_loc)
+ {
+ struct breakpoint *b = loc->owner;
+
+ gdb_assert (loc->pspace == current_program_space);
+ if (gnu_ifunc_resolve_name (loc->function_name,
+ &loc->requested_address))
+ {
+ /* Recalculate ADDRESS based on new REQUESTED_ADDRESS. */
+ loc->address = adjust_breakpoint_address (loc->gdbarch,
+ loc->requested_address,
+ b->type);
+ }
+ else if (b->type == bp_breakpoint && b->loc == loc
+ && loc->next == NULL && b->related_breakpoint == b)
+ {
+ /* Create only the whole new breakpoint of this type but do not
+ mess more complicated breakpoints with multiple locations. */
+ b->type = bp_gnu_ifunc_resolver;
+ }
+ }
+
if (loc->function_name)
loc->function_name = xstrdup (loc->function_name);
}
@@ -5812,7 +5880,8 @@ set_raw_breakpoint (struct gdbarch *gdbarch,
b->loc->section = sal.section;
b->line_number = sal.line;
- set_breakpoint_location_function (b->loc);
+ set_breakpoint_location_function (b->loc,
+ sal.explicit_pc || sal.explicit_line);
breakpoints_changed ();
@@ -6929,7 +6998,7 @@ clone_momentary_breakpoint (struct breakpoint *orig)
copy = set_raw_breakpoint_without_location (orig->gdbarch, orig->type);
copy->loc = allocate_bp_location (copy);
- set_breakpoint_location_function (copy->loc);
+ set_breakpoint_location_function (copy->loc, 1);
copy->loc->gdbarch = orig->loc->gdbarch;
copy->loc->requested_address = orig->loc->requested_address;
@@ -7029,6 +7098,7 @@ mention (struct breakpoint *b)
do_cleanups (ui_out_chain);
break;
case bp_breakpoint:
+ case bp_gnu_ifunc_resolver:
if (ui_out_is_mi_like_p (uiout))
{
say_where = 0;
@@ -7039,6 +7109,8 @@ mention (struct breakpoint *b)
else
printf_filtered (_("Breakpoint"));
printf_filtered (_(" %d"), b->number);
+ if (b->type == bp_gnu_ifunc_resolver)
+ printf_filtered (_(" at gnu-indirect-function resolver"));
say_where = 1;
break;
case bp_hardware_breakpoint:
@@ -7098,6 +7170,7 @@ mention (struct breakpoint *b)
case bp_longjmp_master:
case bp_std_terminate_master:
case bp_exception_master:
+ case bp_gnu_ifunc_resolver_return:
break;
}
@@ -7158,7 +7231,8 @@ add_location_to_breakpoint (struct breakpoint *b,
gdb_assert (loc->pspace != NULL);
loc->section = sal->section;
- set_breakpoint_location_function (loc);
+ set_breakpoint_location_function (loc,
+ sal->explicit_pc || sal->explicit_line);
return loc;
}
@@ -10399,7 +10473,7 @@ update_static_tracepoint (struct breakpoint *b, struct symtab_and_line sal)
return sal;
}
-static void
+void
update_breakpoint_locations (struct breakpoint *b,
struct symtabs_and_lines sals)
{
@@ -10531,6 +10605,7 @@ breakpoint_re_set_one (void *bint)
case bp_tracepoint:
case bp_fast_tracepoint:
case bp_static_tracepoint:
+ case bp_gnu_ifunc_resolver:
/* Do not attempt to re-set breakpoints disabled during startup. */
if (b->enable_state == bp_startup_disabled)
return 0;
@@ -10701,6 +10776,7 @@ breakpoint_re_set_one (void *bint)
case bp_exception:
case bp_exception_resume:
case bp_jit_event:
+ case bp_gnu_ifunc_resolver_return:
break;
}
generated by cgit v1.1 at 2024-12-06 12:15:46 +0000