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


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH] mips: set CP0 Debug DExcCode for SDBBP instruction
Date: Wed, 3 May 2017 09:54:48 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 05/02/2017 09:03 AM, Pavel Dovgalyuk wrote:
From: Pavel Dovgalyuk <address@hidden>

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 <address@hidden>

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

---
 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;





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