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m68k: fix exception stack frame for 68000

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68000 CPUs do not save format in the exception stack frame.
This patch adds feature checking to prevent format saving for 68000.
m68k_ret() already includes this modification, this patch fixes
the exception processing function too.

Backports commit 000761dc0c97d70e7314db3e8f52783880325a22 from qemu
This commit is contained in:
Pavel Dovgalyuk 2018-04-16 13:49:46 -04:00 committed by Lioncash
parent 9517a002da
commit fe353764e9
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 18 additions and 15 deletions
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33
qemu/target/m68k/op_helper.c
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@ -280,22 +280,25 @@ static inline void do_stack_frame(CPUM68KState *env, uint32_t *sp,
uint16_t format, uint16_t sr,
uint32_t addr, uint32_t retaddr)
{
CPUState *cs = CPU(m68k_env_get_cpu(env));
switch (format) {
case 4:
*sp -= 4;
cpu_stl_kernel(env, *sp, env->pc);
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
case 3:
case 2:
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
if (m68k_feature(env, M68K_FEATURE_QUAD_MULDIV)) {
/* all except 68000 */
CPUState *cs = CPU(m68k_env_get_cpu(env));
switch (format) {
case 4:
*sp -= 4;
cpu_stl_kernel(env, *sp, env->pc);
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
case 3:
case 2:
*sp -= 4;
cpu_stl_kernel(env, *sp, addr);
break;
}
*sp -= 2;
cpu_stw_kernel(env, *sp, (format << 12) + (cs->exception_index << 2));
}
*sp -= 2;
cpu_stw_kernel(env, *sp, (format << 12) + (cs->exception_index << 2));
*sp -= 4;
cpu_stl_kernel(env, *sp, retaddr);
*sp -= 2;