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target-m68k: initialize FPU registers

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on reset, set FP registers to NaN and control registers to 0

Backports commit f4a6ce5155aab2a7ed7b9032a72187b37b3bfffe from qemu
This commit is contained in:
Laurent Vivier 2018-03-03 18:51:34 -05:00 committed by Lioncash
parent d92621522a
commit 92555a1134
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 8 additions and 1 deletions
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9
qemu/target/m68k/cpu.c
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@ -49,6 +49,8 @@ static void m68k_cpu_reset(CPUState *s)
M68kCPU *cpu = M68K_CPU(s->uc, s); M68kCPU *cpu = M68K_CPU(s->uc, s);
M68kCPUClass *mcc = M68K_CPU_GET_CLASS(s->uc, cpu); M68kCPUClass *mcc = M68K_CPU_GET_CLASS(s->uc, cpu);
CPUM68KState *env = &cpu->env; CPUM68KState *env = &cpu->env;
float64 nan = float64_default_nan(NULL);
int i;
mcc->parent_reset(s); mcc->parent_reset(s);
@ -57,7 +59,12 @@ static void m68k_cpu_reset(CPUState *s)
env->sr = 0x2700; env->sr = 0x2700;
#endif #endif
m68k_switch_sp(env); m68k_switch_sp(env);
/* ??? FP regs should be initialized to NaN. */ for (i = 0; i < 8; i++) {
env->fregs[i] = nan;
}
env->fpcr = 0;
env->fpsr = 0;
cpu_m68k_set_ccr(env, 0); cpu_m68k_set_ccr(env, 0);
/* TODO: We should set PC from the interrupt vector. */ /* TODO: We should set PC from the interrupt vector. */
env->pc = 0; env->pc = 0;