From: Laurent Vivier <laurent@vivier.eu>
Date: Thu, 26 Jan 2023 12:52:34 +0000 (+0100)
Subject: m68k: fix 'bkpt' instruction in softmmu mode
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c1fc91b82545a2b8ab73f81e5b7b6b0fec292ea1;p=qemu.git

m68k: fix 'bkpt' instruction in softmmu mode

In linux-user mode, 'bkpt' generates an EXP_DEBUG exception to allow
QEMU gdb server to intercept and manage the operation with an external
debugger.

In softmmu mode, the instruction must generate an illegal instruction
exception as it is on real hardware to be managed by the kernel.

Buglink: https://gitlab.com/qemu-project/qemu/-/issues/1462
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230126125234.3186042-1-laurent@vivier.eu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---

diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 18418312b1..31178c3b1d 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -2774,7 +2774,11 @@ DISAS_INSN(swap)
 
 DISAS_INSN(bkpt)
 {
+#if defined(CONFIG_SOFTMMU)
+    gen_exception(s, s->base.pc_next, EXCP_ILLEGAL);
+#else
     gen_exception(s, s->base.pc_next, EXCP_DEBUG);
+#endif
 }
 
 DISAS_INSN(pea)