target/mips: Extract trap code into env->error_code

Simplify cpu_loop by doing all of the decode in translate.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220107213243.212806-18-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 1 insertions, 40 deletions

diff --git a/linux-user/mips/cpu_loop.c b/linux-user/mips/cpu_loop.c
index 9a6ab2d..9bb12a0 100644
--- a/linux-user/mips/cpu_loop.c
+++ b/linux-user/mips/cpu_loop.c
@@ -197,51 +197,12 @@ done_syscall:
             do_tr_or_bp(env, code, false);
             break;
         case EXCP_TRAP:
-            {
-                abi_ulong trap_instr;
-                unsigned int code = 0;
-
-                /*
-                 * FIXME: It would be better to decode the trap number
-                 * during translate, and store it in error_code while
-                 * raising the exception.  We should not be re-reading
-                 * the opcode here.
-                 */
-
-                if (env->hflags & MIPS_HFLAG_M16) {
-                    /* microMIPS mode */
-                    abi_ulong instr[2];
-
-                    ret = get_user_u16(instr[0], env->active_tc.PC) ||
-                          get_user_u16(instr[1], env->active_tc.PC + 2);
-
-                    trap_instr = (instr[0] << 16) | instr[1];
-                } else {
-                    ret = get_user_u32(trap_instr, env->active_tc.PC);
-                }
-
-                if (ret != 0) {
-                    goto error;
-                }
-
-                /* The immediate versions don't provide a code.  */
-                if (!(trap_instr & 0xFC000000)) {
-                    if (env->hflags & MIPS_HFLAG_M16) {
-                        /* microMIPS mode */
-                        code = ((trap_instr >> 12) & ((1 << 4) - 1));
-                    } else {
-                        code = ((trap_instr >> 6) & ((1 << 10) - 1));
-                    }
-                }
-
-                do_tr_or_bp(env, code, true);
-            }
+            do_tr_or_bp(env, env->error_code, true);
             break;
         case EXCP_ATOMIC:
             cpu_exec_step_atomic(cs);
             break;
         default:
-error:
             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
             abort();
         }