diff mbox

[PATCHv2,17/31] ppc: Don't update NIP in DCR access routines

Message ID 1469602609-31349-17-git-send-email-benh@kernel.crashing.org
State New
Headers show

Commit Message

Benjamin Herrenschmidt July 27, 2016, 6:56 a.m. UTC 
This is no longer necessary as the helpers will properly retrieve
the return address when needed

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 target-ppc/timebase_helper.c | 23 +++++++++++++----------
 target-ppc/translate.c       | 12 ------------
 2 files changed, 13 insertions(+), 22 deletions(-)
diff mbox

Patch

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 622c375..c7bee9d 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -5497,8 +5497,6 @@  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);
@@ -5514,8 +5512,6 @@  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);
@@ -5530,8 +5526,6 @@  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 */
@@ -5546,8 +5540,6 @@  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 */
@@ -5557,8 +5549,6 @@  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 */
@@ -5567,8 +5557,6 @@  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 */