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target/m68k: Init local float_status from env fp_status in gdb get/set reg

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In cf_fpu_gdb_get_reg() and cf_fpu_gdb_set_reg() we do the conversion
from float64 to floatx80 using a scratch float_status, because we
don't want the conversion to affect the CPU's floating point exception
status. Currently we use a zero-initialized float_status. This will
get steadily more awkward as we add config knobs to float_status
that the target must initialize. Avoid having to add any of that
configuration here by instead initializing our local float_status
from the env->fp_status.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-32-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-12-11 15:31:03 +00:00
parent b1969a5dd4
commit ca81533e94
1 changed files with 4 additions and 2 deletions
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6
target/m68k/helper.c
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@ -36,7 +36,8 @@ static int cf_fpu_gdb_get_reg(CPUState *cs, GByteArray *mem_buf, int n)
CPUM68KState *env = &cpu->env;
if (n < 8) {
float_status s = {};
/* Use scratch float_status so any exceptions don't change CPU state */
float_status s = env->fp_status;
return gdb_get_reg64(mem_buf, floatx80_to_float64(env->fregs[n].d, &s));
}
switch (n) {
@ -56,7 +57,8 @@ static int cf_fpu_gdb_set_reg(CPUState *cs, uint8_t *mem_buf, int n)
CPUM68KState *env = &cpu->env;
if (n < 8) {
float_status s = {};
/* Use scratch float_status so any exceptions don't change CPU state */
float_status s = env->fp_status;
env->fregs[n].d = float64_to_floatx80(ldq_be_p(mem_buf), &s);
return 8;
}