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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>
This commit is contained in:
Keith Packard 2023-10-03 15:26:06 -07:00 committed by Richard Henderson
parent f161e723fd
commit 0815c228bd
1 changed files with 5 additions and 0 deletions
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target/m68k/translate.c
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@ -2646,6 +2646,11 @@ DISAS_INSN(bkpt)
#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
}