[Qemu-devel] [PULL 35/66] ppc: Don't update NIP on conditional trap instructions

[David Gibson]

From: Benjamin Herrenschmidt <address@hidden>

This is no longer necessary as the helpers will properly retrieve
the return address when needed.

Signed-off-by: Benjamin Herrenschmidt <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
 target-ppc/excp_helper.c | 6 ++++--
 target-ppc/translate.c   | 8 --------
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
index d31eece..882d529 100644
--- a/target-ppc/excp_helper.c
+++ b/target-ppc/excp_helper.c
@@ -1031,7 +1031,8 @@ void helper_tw(CPUPPCState *env, target_ulong arg1, 
target_ulong arg2,
                   ((int32_t)arg1 == (int32_t)arg2 && (flags & 0x04)) ||
                   ((uint32_t)arg1 < (uint32_t)arg2 && (flags & 0x02)) ||
                   ((uint32_t)arg1 > (uint32_t)arg2 && (flags & 0x01))))) {
-        raise_exception_err(env, POWERPC_EXCP_PROGRAM, POWERPC_EXCP_TRAP);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_TRAP, GETPC());
     }
 }
 
@@ -1044,7 +1045,8 @@ void helper_td(CPUPPCState *env, target_ulong arg1, 
target_ulong arg2,
                   ((int64_t)arg1 == (int64_t)arg2 && (flags & 0x04)) ||
                   ((uint64_t)arg1 < (uint64_t)arg2 && (flags & 0x02)) ||
                   ((uint64_t)arg1 > (uint64_t)arg2 && (flags & 0x01))))) {
-        raise_exception_err(env, POWERPC_EXCP_PROGRAM, POWERPC_EXCP_TRAP);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_TRAP, GETPC());
     }
 }
 #endif
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index f75cdc6..93cd98c 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -3580,8 +3580,6 @@ static void gen_sc(DisasContext *ctx)
 static void gen_tw(DisasContext *ctx)
 {
     TCGv_i32 t0 = tcg_const_i32(TO(ctx->opcode));
-    /* Update the nip since this might generate a trap exception */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_tw(cpu_env, cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
                   t0);
     tcg_temp_free_i32(t0);
@@ -3592,8 +3590,6 @@ static void gen_twi(DisasContext *ctx)
 {
     TCGv t0 = tcg_const_tl(SIMM(ctx->opcode));
     TCGv_i32 t1 = tcg_const_i32(TO(ctx->opcode));
-    /* Update the nip since this might generate a trap exception */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_tw(cpu_env, cpu_gpr[rA(ctx->opcode)], t0, t1);
     tcg_temp_free(t0);
     tcg_temp_free_i32(t1);
@@ -3604,8 +3600,6 @@ static void gen_twi(DisasContext *ctx)
 static void gen_td(DisasContext *ctx)
 {
     TCGv_i32 t0 = tcg_const_i32(TO(ctx->opcode));
-    /* Update the nip since this might generate a trap exception */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_td(cpu_env, cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
                   t0);
     tcg_temp_free_i32(t0);
@@ -3616,8 +3610,6 @@ static void gen_tdi(DisasContext *ctx)
 {
     TCGv t0 = tcg_const_tl(SIMM(ctx->opcode));
     TCGv_i32 t1 = tcg_const_i32(TO(ctx->opcode));
-    /* Update the nip since this might generate a trap exception */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_td(cpu_env, cpu_gpr[rA(ctx->opcode)], t0, t1);
     tcg_temp_free(t0);
     tcg_temp_free_i32(t1);
-- 
2.7.4