[Qemu-ppc] [PULL 32/66] ppc: Don't update NIP in DCR access routines

[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/timebase_helper.c | 23 +++++++++++++----------
 target-ppc/translate.c       | 12 ------------
 2 files changed, 13 insertions(+), 22 deletions(-)

diff --git a/target-ppc/timebase_helper.c b/target-ppc/timebase_helper.c
index a07faa4..73363e0 100644
--- a/target-ppc/timebase_helper.c
+++ b/target-ppc/timebase_helper.c
@@ -19,6 +19,7 @@
 #include "qemu/osdep.h"
 #include "cpu.h"
 #include "exec/helper-proto.h"
+#include "exec/exec-all.h"
 #include "qemu/log.h"
 
 /*****************************************************************************/
@@ -143,15 +144,16 @@ target_ulong helper_load_dcr(CPUPPCState *env, 
target_ulong dcrn)
 
     if (unlikely(env->dcr_env == NULL)) {
         qemu_log_mask(LOG_GUEST_ERROR, "No DCR environment\n");
-        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
-                                   POWERPC_EXCP_INVAL |
-                                   POWERPC_EXCP_INVAL_INVAL);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_INVAL_INVAL, GETPC());
     } else if (unlikely(ppc_dcr_read(env->dcr_env,
                                      (uint32_t)dcrn, &val) != 0)) {
         qemu_log_mask(LOG_GUEST_ERROR, "DCR read error %d %03x\n",
                       (uint32_t)dcrn, (uint32_t)dcrn);
-        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
-                                   POWERPC_EXCP_INVAL | POWERPC_EXCP_PRIV_REG);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_PRIV_REG, GETPC());
     }
     return val;
 }
@@ -160,14 +162,15 @@ void helper_store_dcr(CPUPPCState *env, target_ulong 
dcrn, target_ulong val)
 {
     if (unlikely(env->dcr_env == NULL)) {
         qemu_log_mask(LOG_GUEST_ERROR, "No DCR environment\n");
-        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
-                                   POWERPC_EXCP_INVAL |
-                                   POWERPC_EXCP_INVAL_INVAL);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_INVAL_INVAL, GETPC());
     } else if (unlikely(ppc_dcr_write(env->dcr_env, (uint32_t)dcrn,
                                       (uint32_t)val) != 0)) {
         qemu_log_mask(LOG_GUEST_ERROR, "DCR write error %d %03x\n",
                       (uint32_t)dcrn, (uint32_t)dcrn);
-        helper_raise_exception_err(env, POWERPC_EXCP_PROGRAM,
-                                   POWERPC_EXCP_INVAL | POWERPC_EXCP_PRIV_REG);
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_PRIV_REG, GETPC());
     }
 }
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index afcdd3e..46b0e18 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -5498,8 +5498,6 @@ static void gen_mfdcr(DisasContext *ctx)
     TCGv dcrn;
 
     CHK_SV;
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     dcrn = tcg_const_tl(SPR(ctx->opcode));
     gen_helper_load_dcr(cpu_gpr[rD(ctx->opcode)], cpu_env, dcrn);
     tcg_temp_free(dcrn);
@@ -5515,8 +5513,6 @@ static void gen_mtdcr(DisasContext *ctx)
     TCGv dcrn;
 
     CHK_SV;
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     dcrn = tcg_const_tl(SPR(ctx->opcode));
     gen_helper_store_dcr(cpu_env, dcrn, cpu_gpr[rS(ctx->opcode)]);
     tcg_temp_free(dcrn);
@@ -5531,8 +5527,6 @@ static void gen_mfdcrx(DisasContext *ctx)
     GEN_PRIV;
 #else
     CHK_SV;
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_load_dcr(cpu_gpr[rD(ctx->opcode)], cpu_env,
                         cpu_gpr[rA(ctx->opcode)]);
     /* Note: Rc update flag set leads to undefined state of Rc0 */
@@ -5547,8 +5541,6 @@ static void gen_mtdcrx(DisasContext *ctx)
     GEN_PRIV;
 #else
     CHK_SV;
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_store_dcr(cpu_env, cpu_gpr[rA(ctx->opcode)],
                          cpu_gpr[rS(ctx->opcode)]);
     /* Note: Rc update flag set leads to undefined state of Rc0 */
@@ -5558,8 +5550,6 @@ static void gen_mtdcrx(DisasContext *ctx)
 /* mfdcrux (PPC 460) : user-mode access to DCR */
 static void gen_mfdcrux(DisasContext *ctx)
 {
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_load_dcr(cpu_gpr[rD(ctx->opcode)], cpu_env,
                         cpu_gpr[rA(ctx->opcode)]);
     /* Note: Rc update flag set leads to undefined state of Rc0 */
@@ -5568,8 +5558,6 @@ static void gen_mfdcrux(DisasContext *ctx)
 /* mtdcrux (PPC 460) : user-mode access to DCR */
 static void gen_mtdcrux(DisasContext *ctx)
 {
-    /* NIP cannot be restored if the memory exception comes from an helper */
-    gen_update_nip(ctx, ctx->nip - 4);
     gen_helper_store_dcr(cpu_env, cpu_gpr[rA(ctx->opcode)],
                          cpu_gpr[rS(ctx->opcode)]);
     /* Note: Rc update flag set leads to undefined state of Rc0 */
-- 
2.7.4