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target/m68k: Perform the semihosting test during translate

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Replace EXCP_HALT_INSN by EXCP_SEMIHOSTING.  Perform the pre-
and post-insn tests during translate, leaving only the actual
semihosting operation for the exception.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-10-03 15:15:24 -07:00
parent 5fae5110ee
commit f161e723fd
3 changed files with 44 additions and 17 deletions
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14
target/m68k/op_helper.c
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@ -202,18 +202,8 @@ static void cf_interrupt_all(CPUM68KState *env, int is_hw)
/* Return from an exception. */
cf_rte(env);
return;
case EXCP_HALT_INSN:
if (semihosting_enabled((env->sr & SR_S) == 0)
&& (env->pc & 3) == 0
&& cpu_lduw_code(env, env->pc - 4) == 0x4e71
&& cpu_ldl_code(env, env->pc) == 0x4e7bf000) {
env->pc += 4;
do_m68k_semihosting(env, env->dregs[0]);
return;
}
cs->halted = 1;
cs->exception_index = EXCP_HLT;
cpu_loop_exit(cs);
case EXCP_SEMIHOSTING:
do_m68k_semihosting(env, env->dregs[0]);
return;
}
}