target/riscv: Don't save pc when exception return

As pc will be written by the xepc in exception return, just ignore
pc in translation.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220120122050.41546-3-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index 6cf6d6ce98feb224e6a66a4543c604cb42039ddf..72cc2582f405f7cb37bd67580fe220b394d90c0e 100644 (file)
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -100,8 +100,8 @@ DEF_HELPER_2(csrr_i128, tl, env, int)
 DEF_HELPER_4(csrw_i128, void, env, int, tl, tl)
 DEF_HELPER_6(csrrw_i128, tl, env, int, tl, tl, tl, tl)
 #ifndef CONFIG_USER_ONLY
-DEF_HELPER_2(sret, tl, env, tl)
-DEF_HELPER_2(mret, tl, env, tl)
+DEF_HELPER_1(sret, tl, env)
+DEF_HELPER_1(mret, tl, env)
 DEF_HELPER_1(wfi, void, env)
 DEF_HELPER_1(tlb_flush, void, env)
 #endif

diff --git a/target/riscv/insn_trans/trans_privileged.c.inc b/target/riscv/insn_trans/trans_privileged.c.inc
index 75c6ef80a6357cf0af9a2719e0a9fc6f36cd81d1..6077bbbf11e59d9ec84affe2974e6b8fd2a5ac11 100644 (file)
--- a/target/riscv/insn_trans/trans_privileged.c.inc
+++ b/target/riscv/insn_trans/trans_privileged.c.inc
@@ -74,10 +74,8 @@ static bool trans_uret(DisasContext *ctx, arg_uret *a)
 static bool trans_sret(DisasContext *ctx, arg_sret *a)
 {
 #ifndef CONFIG_USER_ONLY
-    tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
-
     if (has_ext(ctx, RVS)) {
-        gen_helper_sret(cpu_pc, cpu_env, cpu_pc);
+        gen_helper_sret(cpu_pc, cpu_env);
         tcg_gen_exit_tb(NULL, 0); /* no chaining */
         ctx->base.is_jmp = DISAS_NORETURN;
     } else {
@@ -92,8 +90,7 @@ static bool trans_sret(DisasContext *ctx, arg_sret *a)
 static bool trans_mret(DisasContext *ctx, arg_mret *a)
 {
 #ifndef CONFIG_USER_ONLY
-    tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
-    gen_helper_mret(cpu_pc, cpu_env, cpu_pc);
+    gen_helper_mret(cpu_pc, cpu_env);
     tcg_gen_exit_tb(NULL, 0); /* no chaining */
     ctx->base.is_jmp = DISAS_NORETURN;
     return true;

diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c
index 6f040f2fb9e9eaa99f69ac6434bb0139c3bdb9a5..67693cb42be5c13b6e2b4f2a53da38ab03503301 100644 (file)
--- a/target/riscv/op_helper.c
+++ b/target/riscv/op_helper.c
@@ -115,7 +115,7 @@ target_ulong helper_csrrw_i128(CPURISCVState *env, int csr,
 
 #ifndef CONFIG_USER_ONLY
 
-target_ulong helper_sret(CPURISCVState *env, target_ulong cpu_pc_deb)
+target_ulong helper_sret(CPURISCVState *env)
 {
     uint64_t mstatus;
     target_ulong prev_priv, prev_virt;
@@ -176,7 +176,7 @@ target_ulong helper_sret(CPURISCVState *env, target_ulong cpu_pc_deb)
     return retpc;
 }
 
-target_ulong helper_mret(CPURISCVState *env, target_ulong cpu_pc_deb)
+target_ulong helper_mret(CPURISCVState *env)
 {
     if (!(env->priv >= PRV_M)) {
         riscv_raise_exception(env, RISCV_EXCP_ILLEGAL_INST, GETPC());