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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2016-07-27 16:56:42 +1000
committerDavid Gibson <david@gibson.dropbear.id.au>2016-09-07 12:40:11 +1000
commit22b56ee5682e64509621f9d5d303a0414e289b11 (patch)
treef51d0117e669a9a98e8756d55f93e7a0ec4ae05d /target-ppc/translate.c
parent3433b732a4c9abb413eb39a6badb63e83ad2288c (diff)
ppc: Handle unconditional (always/never) traps at translation time
We don't need to call a helper for trap always and trap never which are used by Linux under some circumstances. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> -- v2. Don't generate the helper call when trapping always Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target-ppc/translate.c')
-rw-r--r--target-ppc/translate.c49
1 files changed, 43 insertions, 6 deletions
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 6bb0ba97ac..7aa8d77972 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -3575,10 +3575,30 @@ static void gen_sc(DisasContext *ctx)
/*** Trap ***/
+/* Check for unconditional traps (always or never) */
+static bool check_unconditional_trap(DisasContext *ctx)
+{
+ /* Trap never */
+ if (TO(ctx->opcode) == 0) {
+ return true;
+ }
+ /* Trap always */
+ if (TO(ctx->opcode) == 31) {
+ gen_exception_err(ctx, POWERPC_EXCP_PROGRAM, POWERPC_EXCP_TRAP);
+ return true;
+ }
+ return false;
+}
+
/* tw */
static void gen_tw(DisasContext *ctx)
{
- TCGv_i32 t0 = tcg_const_i32(TO(ctx->opcode));
+ TCGv_i32 t0;
+
+ if (check_unconditional_trap(ctx)) {
+ return;
+ }
+ t0 = tcg_const_i32(TO(ctx->opcode));
gen_helper_tw(cpu_env, cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
t0);
tcg_temp_free_i32(t0);
@@ -3587,8 +3607,14 @@ static void gen_tw(DisasContext *ctx)
/* twi */
static void gen_twi(DisasContext *ctx)
{
- TCGv t0 = tcg_const_tl(SIMM(ctx->opcode));
- TCGv_i32 t1 = tcg_const_i32(TO(ctx->opcode));
+ TCGv t0;
+ TCGv_i32 t1;
+
+ if (check_unconditional_trap(ctx)) {
+ return;
+ }
+ t0 = tcg_const_tl(SIMM(ctx->opcode));
+ t1 = tcg_const_i32(TO(ctx->opcode));
gen_helper_tw(cpu_env, cpu_gpr[rA(ctx->opcode)], t0, t1);
tcg_temp_free(t0);
tcg_temp_free_i32(t1);
@@ -3598,7 +3624,12 @@ static void gen_twi(DisasContext *ctx)
/* td */
static void gen_td(DisasContext *ctx)
{
- TCGv_i32 t0 = tcg_const_i32(TO(ctx->opcode));
+ TCGv_i32 t0;
+
+ if (check_unconditional_trap(ctx)) {
+ return;
+ }
+ t0 = tcg_const_i32(TO(ctx->opcode));
gen_helper_td(cpu_env, cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
t0);
tcg_temp_free_i32(t0);
@@ -3607,8 +3638,14 @@ static void gen_td(DisasContext *ctx)
/* tdi */
static void gen_tdi(DisasContext *ctx)
{
- TCGv t0 = tcg_const_tl(SIMM(ctx->opcode));
- TCGv_i32 t1 = tcg_const_i32(TO(ctx->opcode));
+ TCGv t0;
+ TCGv_i32 t1;
+
+ if (check_unconditional_trap(ctx)) {
+ return;
+ }
+ t0 = tcg_const_tl(SIMM(ctx->opcode));
+ t1 = tcg_const_i32(TO(ctx->opcode));
gen_helper_td(cpu_env, cpu_gpr[rA(ctx->opcode)], t0, t1);
tcg_temp_free(t0);
tcg_temp_free_i32(t1);