[PATCH] mips: pass code of conditional trap

[YunQiang Su <syq@debian.org>]

Linux and We use the code of conditional trap instructions to emit
signals other than simple SIGTRAP.  Currently, code 6 (overflow),
7 (div by zero) are supported. It means that if code 7 is used with
a conditional trap instruction, a SIGFPE instead of SIGTRAP will emit.

But when `gen_trap` we didn't pass the code as we use `generate_exception`,
which has no info about the code.  Let's introduce a new function
`generate_exception_code` for it.
---
 target/mips/tcg/translate.c | 8 +++++++-
 target/mips/tcg/translate.h | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/target/mips/tcg/translate.c b/target/mips/tcg/translate.c
index 333469b268..e680a1c2f2 100644
--- a/target/mips/tcg/translate.c
+++ b/target/mips/tcg/translate.c
@@ -1353,6 +1353,12 @@ void generate_exception(DisasContext *ctx, int excp)
     gen_helper_raise_exception(tcg_env, tcg_constant_i32(excp));
 }
 
+void generate_exception_with_code(DisasContext *ctx, int excp, int code)
+{
+    gen_helper_raise_exception_err(tcg_env, tcg_constant_i32(excp),
+                                   tcg_constant_i32(code));
+}
+
 void generate_exception_end(DisasContext *ctx, int excp)
 {
     generate_exception_err(ctx, excp, 0);
@@ -4553,7 +4559,7 @@ static void gen_trap(DisasContext *ctx, uint32_t opc,
         if (ctx->hflags != ctx->saved_hflags) {
             tcg_gen_movi_i32(hflags, ctx->hflags);
         }
-        generate_exception(ctx, EXCP_TRAP);
+        generate_exception_with_code(ctx, EXCP_TRAP, code);
         gen_set_label(l1);
     }
 }
diff --git a/target/mips/tcg/translate.h b/target/mips/tcg/translate.h
index 2b6646b339..e3d544b478 100644
--- a/target/mips/tcg/translate.h
+++ b/target/mips/tcg/translate.h
@@ -134,6 +134,7 @@ enum {
     } while (0)
 
 void generate_exception(DisasContext *ctx, int excp);
+void generate_exception_with_code(DisasContext *ctx, int excp, int code);
 void generate_exception_err(DisasContext *ctx, int excp, int err);
 void generate_exception_end(DisasContext *ctx, int excp);
 void generate_exception_break(DisasContext *ctx, int code);
-- 
2.39.3 (Apple Git-146)