mips: set CP0 Debug DExcCode for SDBBP instruction

This patch fixes setting DExcCode field of CP0 Debug register
when SDBBP instruction is executed. According to EJTAG specification,
this field must be set to the value 9 (Bp).

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-id: 20170502120350.3368.92338.stgit@PASHA-ISP
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

diff --git a/target/mips/helper.c b/target/mips/helper.c
index e359ca3b448daa15b3536af3b0c19e77c465dfe5..166f0d1243aa3802c5dab5205184a70f44eb3118 100644 (file)
--- a/target/mips/helper.c
+++ b/target/mips/helper.c
@@ -627,6 +627,8 @@ void mips_cpu_do_interrupt(CPUState *cs)
         goto set_DEPC;
     case EXCP_DBp:
         env->CP0_Debug |= 1 << CP0DB_DBp;
+        /* Setup DExcCode - SDBBP instruction */
+        env->CP0_Debug = (env->CP0_Debug & ~(0x1fULL << CP0DB_DEC)) | 9 << CP0DB_DEC;
         goto set_DEPC;
     case EXCP_DDBS:
         env->CP0_Debug |= 1 << CP0DB_DDBS;