[PULL 03/19] target/m68k: Raise the TRAPn exception with the correct pc

From: Laurent Vivier <laurent@vivier.eu>
To: qemu-devel@nongnu.org
Cc: Laurent Vivier <laurent@vivier.eu>,
	Richard Henderson <richard.henderson@linaro.org>
Subject: [PULL 03/19] target/m68k: Raise the TRAPn exception with the correct pc
Date: Thu,  2 Jun 2022 13:58:21 +0200	[thread overview]
Message-ID: <20220602115837.2013918-4-laurent@vivier.eu> (raw)
In-Reply-To: <20220602115837.2013918-1-laurent@vivier.eu>

From: Richard Henderson <richard.henderson@linaro.org>

Rather than adjust the PC in all of the consumers, raise
the exception with the correct PC in the first place.

Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220602013401.303699-2-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/m68k/cpu_loop.c | 1 -
 target/m68k/op_helper.c    | 9 ---------
 target/m68k/translate.c    | 2 +-
 3 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/linux-user/m68k/cpu_loop.c b/linux-user/m68k/cpu_loop.c
index d1bf8548b747..56417f7401dd 100644
--- a/linux-user/m68k/cpu_loop.c
+++ b/linux-user/m68k/cpu_loop.c
@@ -56,7 +56,6 @@ void cpu_loop(CPUM68KState *env)
             {
                 abi_long ret;
                 n = env->dregs[0];
-                env->pc += 2;
                 ret = do_syscall(env,
                                  n,
                                  env->dregs[1],
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c
index 8decc612409c..d30f988ae089 100644
--- a/target/m68k/op_helper.c
+++ b/target/m68k/op_helper.c
@@ -217,11 +217,6 @@ static void cf_interrupt_all(CPUM68KState *env, int is_hw)
             cpu_loop_exit(cs);
             return;
         }
-        if (cs->exception_index >= EXCP_TRAP0
-            && cs->exception_index <= EXCP_TRAP15) {
-            /* Move the PC after the trap instruction.  */
-            retaddr += 2;
-        }
     }
 
     vector = cs->exception_index << 2;
@@ -304,10 +299,6 @@ static void m68k_interrupt_all(CPUM68KState *env, int is_hw)
             /* Return from an exception.  */
             m68k_rte(env);
             return;
-        case EXCP_TRAP0 ...  EXCP_TRAP15:
-            /* Move the PC after the trap instruction.  */
-            retaddr += 2;
-            break;
         }
     }
 
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index e4efd988d2db..22e5379d3c64 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -4860,7 +4860,7 @@ DISAS_INSN(wdebug)
 
 DISAS_INSN(trap)
 {
-    gen_exception(s, s->base.pc_next, EXCP_TRAP0 + (insn & 0xf));
+    gen_exception(s, s->pc, EXCP_TRAP0 + (insn & 0xf));
 }
 
 static void gen_load_fcr(DisasContext *s, TCGv res, int reg)
-- 
2.36.1


