target/m68k: Support semihosting on non-ColdFire targets
According to the m68k semihosting spec:
"The instruction used to trigger a semihosting request depends on the
m68k processor variant. On ColdFire, "halt" is used; on other processors
(which don't implement "halt"), "bkpt #0" may be used."
Add support for non-CodeFire processors by matching BKPT #0 instructions.
Signed-off-by: Keith Packard <keithp@keithp.com>
[rth: Use semihosting_test()]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/target/m68k/translate.c b/target/m68k/translate.c
index 647bd9d..1699275 100644
--- a/target/m68k/translate.c
+++ b/target/m68k/translate.c
@@ -2646,6 +2646,11 @@
#if defined(CONFIG_USER_ONLY)
gen_exception(s, s->base.pc_next, EXCP_DEBUG);
#else
+ /* BKPT #0 is the alternate semihosting instruction. */
+ if ((insn & 7) == 0 && semihosting_test(s)) {
+ gen_exception(s, s->pc, EXCP_SEMIHOSTING);
+ return;
+ }
gen_exception(s, s->base.pc_next, EXCP_ILLEGAL);
#endif
}
