[Qemu-devel] [PATCH] mips: set CP0 Debug DExcCode for SDBBP instruction

[Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>]

From: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

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>
---
 target/mips/helper.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/mips/helper.c b/target/mips/helper.c
index e359ca3b44..166f0d1243 100644
--- 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;