[Qemu-devel] [PATCH 05/15] Openrisc: add exception support

[Jia Liu <proljc@gmail.com>]

add the openrisc exception support.

Signed-off-by: Jia Liu <proljc@gmail.com>
---
 Makefile.target               |    2 +-
 target-openrisc/excp.c        |   27 +++++++++++++++++++++++++++
 target-openrisc/excp.h        |   28 ++++++++++++++++++++++++++++
 target-openrisc/excp_helper.c |   28 ++++++++++++++++++++++++++++
 target-openrisc/helper.h      |    3 +++
 target-openrisc/translate.c   |   25 ++++++++++++++++---------
 6 files changed, 103 insertions(+), 10 deletions(-)
 create mode 100644 target-openrisc/excp.c
 create mode 100644 target-openrisc/excp.h
 create mode 100644 target-openrisc/excp_helper.c

diff --git a/Makefile.target b/Makefile.target
index 975c9a8..ed5f0b0 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -101,7 +101,7 @@ endif
 libobj-$(TARGET_SPARC) += int32_helper.o
 libobj-$(TARGET_SPARC64) += int64_helper.o
 libobj-$(TARGET_ALPHA) += int_helper.o fpu_helper.o sys_helper.o mem_helper.o
-libobj-$(TARGET_OPENRISC) += intrp_helper.o mem.o mem_helper.o
+libobj-$(TARGET_OPENRISC) += excp.o excp_helper.o intrp_helper.o mem.o mem_helper.o
 
 libobj-y += disas.o
 libobj-$(CONFIG_TCI_DIS) += tci-dis.o
diff --git a/target-openrisc/excp.c b/target-openrisc/excp.c
new file mode 100644
index 0000000..fc9391a
--- /dev/null
+++ b/target-openrisc/excp.c
@@ -0,0 +1,27 @@
+/*
+ *  Openrisc exception.
+ *
+ *  Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "excp.h"
+
+void raise_exception(CPUOPENRISCState *env, uint32_t excp)
+{
+    env->exception_index = excp;
+    cpu_loop_exit(env);
+}
diff --git a/target-openrisc/excp.h b/target-openrisc/excp.h
new file mode 100644
index 0000000..4c32e46
--- /dev/null
+++ b/target-openrisc/excp.h
@@ -0,0 +1,28 @@
+/*
+ *  Openrisc exception header.
+ *
+ *  Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef QEMU_OPENRISC_EXCP_H
+#define QEMU_OPENRISC_EXCP_H
+
+#include "cpu.h"
+#include "qemu-common.h"
+
+void raise_exception(CPUOPENRISCState *env, uint32_t excp);
+
+#endif /* QEMU_OPENRISC_EXCP_H */
diff --git a/target-openrisc/excp_helper.c b/target-openrisc/excp_helper.c
new file mode 100644
index 0000000..0cad14b
--- /dev/null
+++ b/target-openrisc/excp_helper.c
@@ -0,0 +1,28 @@
+/*
+ * OpenRISC exception helper routines
+ *
+ *  Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
+ */
+
+#include "cpu.h"
+#include "helper.h"
+#include "excp.h"
+
+void HELPER(exception)(CPUOPENRISCState *env, uint32_t excp)
+{
+    raise_exception(env, excp);
+}
diff --git a/target-openrisc/helper.h b/target-openrisc/helper.h
index bb394ad..a0fb8c4 100644
--- a/target-openrisc/helper.h
+++ b/target-openrisc/helper.h
@@ -20,6 +20,9 @@
 
 #include "def-helper.h"
 
+/* exception */
+DEF_HELPER_FLAGS_2(exception, 0, void, env, i32)
+
 /* interrupt */
 DEF_HELPER_FLAGS_1(rfe, 0, void, env)
 
diff --git a/target-openrisc/translate.c b/target-openrisc/translate.c
index dd0240c..a1264c9 100644
--- a/target-openrisc/translate.c
+++ b/target-openrisc/translate.c
@@ -155,6 +155,13 @@ static inline void gen_load_gpr(TCGv t, unsigned int reg)
     }
 }
 
+static void gen_exception(DisasContext *dc, unsigned int excp)
+{
+    TCGv_i32 tmp = tcg_const_i32(excp);
+    gen_helper_exception(cpu_env, tmp);
+    tcg_temp_free(tmp);
+}
+
 static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
 {
     TranslationBlock *tb;
@@ -167,7 +174,7 @@ static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
     } else {
         tcg_gen_movi_tl(cpu_pc, dest);
         if (dc->singlestep_enabled) {
-            /* exception here */
+            gen_exception(dc, EXCP_DEBUG);
         }
         tcg_gen_exit_tb(0);
     }
@@ -281,7 +288,7 @@ static void dec_calc(DisasContext *dc, CPUOPENRISCState *env, uint32_t insn)
             if (rb != 0) {
                 tcg_gen_div_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
             } else {
-                /* exception here */
+                gen_exception(dc, EXCP_RANGE);
             }
             break;
         default:
@@ -296,7 +303,7 @@ static void dec_calc(DisasContext *dc, CPUOPENRISCState *env, uint32_t insn)
             if (rb != 0) {
                 tcg_gen_divu_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
             } else {
-                /* exception here */
+                gen_exception(dc, EXCP_RANGE);
             }
             break;
         default:
@@ -1003,14 +1010,14 @@ static void dec_sys(DisasContext *dc, CPUOPENRISCState *env, uint32_t insn)
     case 0x000:  /*l.sys*/
         /*LOG_DIS("l.sys %d\n", K16);*/
         tcg_gen_movi_tl(cpu_pc, dc->pc);
-        /* exception here */
+        gen_exception(dc, EXCP_SYSCALL);
         dc->is_jmp = DISAS_UPDATE;
         break;
 
     case 0x100:  /*l.trap*/
         /*LOG_DIS("l.trap %d\n", K16);*/
         tcg_gen_movi_tl(cpu_pc, dc->pc);
-        /* exception here */
+        gen_exception(dc, EXCP_TRAP);
         break;
 
     case 0x300:  /*l.csync*/
@@ -1085,7 +1092,7 @@ static void dec_float(DisasContext *dc, CPUOPENRISCState *env, uint32_t insn)
         if (cpu_R[rb] != 0) {
             tcg_gen_div_i64(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
         } else {
-            /* exception here */
+            gen_exception(dc, EXCP_RANGE);
         }
         break;
 
@@ -1094,7 +1101,7 @@ static void dec_float(DisasContext *dc, CPUOPENRISCState *env, uint32_t insn)
         if (cpu_R[rb] != 0) {
             tcg_gen_div_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
         } else {
-            /* exception here */
+            gen_exception(dc, EXCP_RANGE);
         }
         break;
 
@@ -1294,7 +1301,7 @@ static void check_breakpoint(CPUOPENRISCState *env, DisasContext *dc)
         QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
             if (bp->pc == dc->pc) {
                 tcg_gen_movi_tl(cpu_pc, dc->pc);
-                /* exception here */
+                gen_exception(dc, EXCP_DEBUG);
                 dc->is_jmp = DISAS_UPDATE;
             }
         }
@@ -1403,7 +1410,7 @@ static inline void gen_intermediate_code_internal(CPUOPENRISCState *env,
         if (dc->is_jmp == DISAS_NEXT) {
             tcg_gen_movi_tl(cpu_pc, dc->pc);
         }
-        /* exception here*/
+        gen_exception(dc, EXCP_DEBUG);
     } else {
         switch (dc->is_jmp) {
         case DISAS_NEXT:
-- 
1.7.9.5