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-rw-r--r--scripts/gcc-plugins/arm_ssp_per_task_plugin.c27
1 files changed, 6 insertions, 21 deletions
diff --git a/scripts/gcc-plugins/arm_ssp_per_task_plugin.c b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
index 8c1af9bdcb1b..7328d037f975 100644
--- a/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
+++ b/scripts/gcc-plugins/arm_ssp_per_task_plugin.c
@@ -4,7 +4,7 @@
__visible int plugin_is_GPL_compatible;
-static unsigned int sp_mask, canary_offset;
+static unsigned int canary_offset;
static unsigned int arm_pertask_ssp_rtl_execute(void)
{
@@ -13,7 +13,7 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
for (insn = get_insns(); insn; insn = NEXT_INSN(insn)) {
const char *sym;
rtx body;
- rtx mask, masked_sp;
+ rtx current;
/*
* Find a SET insn involving a SYMBOL_REF to __stack_chk_guard
@@ -30,19 +30,13 @@ static unsigned int arm_pertask_ssp_rtl_execute(void)
/*
* Replace the source of the SET insn with an expression that
- * produces the address of the copy of the stack canary value
- * stored in struct thread_info
+ * produces the address of the current task's stack canary value
*/
- mask = GEN_INT(sext_hwi(sp_mask, GET_MODE_PRECISION(Pmode)));
- masked_sp = gen_reg_rtx(Pmode);
+ current = gen_reg_rtx(Pmode);
- emit_insn_before(gen_rtx_set(masked_sp,
- gen_rtx_AND(Pmode,
- stack_pointer_rtx,
- mask)),
- insn);
+ emit_insn_before(gen_load_tp_hard(current), insn);
- SET_SRC(body) = gen_rtx_PLUS(Pmode, masked_sp,
+ SET_SRC(body) = gen_rtx_PLUS(Pmode, current,
GEN_INT(canary_offset));
}
return 0;
@@ -72,7 +66,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
const char * const plugin_name = plugin_info->base_name;
const int argc = plugin_info->argc;
const struct plugin_argument *argv = plugin_info->argv;
- int tso = 0;
int i;
if (!plugin_default_version_check(version, &gcc_version)) {
@@ -91,11 +84,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
return 1;
}
- if (!strcmp(argv[i].key, "tso")) {
- tso = atoi(argv[i].value);
- continue;
- }
-
if (!strcmp(argv[i].key, "offset")) {
canary_offset = atoi(argv[i].value);
continue;
@@ -105,9 +93,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info,
return 1;
}
- /* create the mask that produces the base of the stack */
- sp_mask = ~((1U << (12 + tso)) - 1);
-
PASS_INFO(arm_pertask_ssp_rtl, "expand", 1, PASS_POS_INSERT_AFTER);
register_callback(plugin_info->base_name, PLUGIN_PASS_MANAGER_SETUP,