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target-m68k: use floatx80 internally

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Coldfire uses float64, but 680x0 use floatx80.
This patch introduces the use of floatx80 internally
and enables 680x0 80bits FPU.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170620205121.26515-4-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2017-06-20 22:51:18 +02:00
parent f4a6ce5155
commit f83311e476
7 changed files with 509 additions and 291 deletions
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12
target/m68k/helper.c
View file

@ -73,10 +73,11 @@ void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf)
g_slist_free(list);
}
static int fpu_gdb_get_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
static int cf_fpu_gdb_get_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
{
if (n < 8) {
stfq_p(mem_buf, env->fregs[n]);
float_status s;
stfq_p(mem_buf, floatx80_to_float64(env->fregs[n].d, &s));
return 8;
}
if (n < 11) {
@ -87,10 +88,11 @@ static int fpu_gdb_get_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
return 0;
}
static int fpu_gdb_set_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
static int cf_fpu_gdb_set_reg(CPUM68KState *env, uint8_t *mem_buf, int n)
{
if (n < 8) {
env->fregs[n] = ldfq_p(mem_buf);
float_status s;
env->fregs[n].d = float64_to_floatx80(ldfq_p(mem_buf), &s);
return 8;
}
if (n < 11) {
@ -126,7 +128,7 @@ void m68k_cpu_init_gdb(M68kCPU *cpu)
CPUM68KState *env = &cpu->env;
if (m68k_feature(env, M68K_FEATURE_CF_FPU)) {
gdb_register_coprocessor(cs, fpu_gdb_get_reg, fpu_gdb_set_reg,
gdb_register_coprocessor(cs, cf_fpu_gdb_get_reg, cf_fpu_gdb_set_reg,
11, "cf-fp.xml", 18);
}
/* TODO: Add [E]MAC registers. */