From fe353764e9800de1cde66a08f5d19bf5772a68b9 Mon Sep 17 00:00:00 2001 From: Pavel Dovgalyuk Date: Mon, 16 Apr 2018 13:49:46 -0400 Subject: [PATCH] m68k: fix exception stack frame for 68000 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 --- qemu/target/m68k/op_helper.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/qemu/target/m68k/op_helper.c b/qemu/target/m68k/op_helper.c index 43be77a2..9b711675 100644 --- a/qemu/target/m68k/op_helper.c +++ b/qemu/target/m68k/op_helper.c @@ -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;