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target-i386: update fp status fix 

This patch introduces cpu_set_fpuc() function, which changes fpuc field
of the CPU state and calls update_fp_status() function.
These calls update status of softfloat library and prevent bugs caused
by non-coherent rounding settings of the FPU and softfloat.

v2 changes:
 * Added missed calls and intoduced setter function (as suggested by TeLeMan)

Reviewed-by: TeLeMan <geleman@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2014-09-17 12:05:19 +04:00 committed by Paolo Bonzini
parent 7dbb4c49bf
commit 5bde14078d
5 changed files with 18 additions and 11 deletions
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2
target-i386/cpu.c
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@ -2580,7 +2580,7 @@ static void x86_cpu_reset(CPUState *s)
for (i = 0; i < 8; i++) {
env->fptags[i] = 1;
}
env->fpuc = 0x37f;
cpu_set_fpuc(env, 0x37f);
env->mxcsr = 0x1f80;
env->xstate_bv = XSTATE_FP | XSTATE_SSE;

2
target-i386/cpu.h
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@ -1251,6 +1251,7 @@ void QEMU_NORETURN raise_interrupt(CPUX86State *nenv, int intno, int is_int,
/* cc_helper.c */
extern const uint8_t parity_table[256];
uint32_t cpu_cc_compute_all(CPUX86State *env1, int op);
void update_fp_status(CPUX86State *env);
static inline uint32_t cpu_compute_eflags(CPUX86State *env)
{
@ -1286,6 +1287,7 @@ static inline void cpu_load_efer(CPUX86State *env, uint64_t val)
/* fpu_helper.c */
void cpu_set_mxcsr(CPUX86State *env, uint32_t val);
void cpu_set_fpuc(CPUX86State *env, uint16_t val);
/* svm_helper.c */
void cpu_svm_check_intercept_param(CPUX86State *env1, uint32_t type,

21
target-i386/fpu_helper.c
View File

@ -537,7 +537,7 @@ uint32_t helper_fnstcw(CPUX86State *env)
return env->fpuc;
}
static void update_fp_status(CPUX86State *env)
void update_fp_status(CPUX86State *env)
{
int rnd_type;
@ -575,8 +575,7 @@ static void update_fp_status(CPUX86State *env)
void helper_fldcw(CPUX86State *env, uint32_t val)
{
env->fpuc = val;
update_fp_status(env);
cpu_set_fpuc(env, val);
}
void helper_fclex(CPUX86State *env)
@ -595,7 +594,7 @@ void helper_fninit(CPUX86State *env)
{
env->fpus = 0;
env->fpstt = 0;
env->fpuc = 0x37f;
cpu_set_fpuc(env, 0x37f);
env->fptags[0] = 1;
env->fptags[1] = 1;
env->fptags[2] = 1;
@ -1013,11 +1012,11 @@ void helper_fldenv(CPUX86State *env, target_ulong ptr, int data32)
int i, fpus, fptag;
if (data32) {
env->fpuc = cpu_lduw_data(env, ptr);
cpu_set_fpuc(env, cpu_lduw_data(env, ptr));
fpus = cpu_lduw_data(env, ptr + 4);
fptag = cpu_lduw_data(env, ptr + 8);
} else {
env->fpuc = cpu_lduw_data(env, ptr);
cpu_set_fpuc(env, cpu_lduw_data(env, ptr));
fpus = cpu_lduw_data(env, ptr + 2);
fptag = cpu_lduw_data(env, ptr + 4);
}
@ -1046,7 +1045,7 @@ void helper_fsave(CPUX86State *env, target_ulong ptr, int data32)
/* fninit */
env->fpus = 0;
env->fpstt = 0;
env->fpuc = 0x37f;
cpu_set_fpuc(env, 0x37f);
env->fptags[0] = 1;
env->fptags[1] = 1;
env->fptags[2] = 1;
@ -1157,7 +1156,7 @@ void helper_fxrstor(CPUX86State *env, target_ulong ptr, int data64)
raise_exception(env, EXCP0D_GPF);
}
env->fpuc = cpu_lduw_data(env, ptr);
cpu_set_fpuc(env, cpu_lduw_data(env, ptr));
fpus = cpu_lduw_data(env, ptr + 2);
fptag = cpu_lduw_data(env, ptr + 4);
env->fpstt = (fpus >> 11) & 7;
@ -1257,6 +1256,12 @@ void cpu_set_mxcsr(CPUX86State *env, uint32_t mxcsr)
set_flush_to_zero((mxcsr & SSE_FZ) ? 1 : 0, &env->fp_status);
}
void cpu_set_fpuc(CPUX86State *env, uint16_t val)
{
env->fpuc = val;
update_fp_status(env);
}
void helper_ldmxcsr(CPUX86State *env, uint32_t val)
{
cpu_set_mxcsr(env, val);

2
target-i386/gdbstub.c
View File

@ -203,7 +203,7 @@ int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
return x86_cpu_gdb_load_seg(cpu, R_GS, mem_buf);
case IDX_FP_REGS + 8:
env->fpuc = ldl_p(mem_buf);
cpu_set_fpuc(env, ldl_p(mem_buf));
return 4;
case IDX_FP_REGS + 9:
tmp = ldl_p(mem_buf);

2
target-i386/machine.c
View File

@ -315,13 +315,13 @@ static int cpu_post_load(void *opaque, int version_id)
env->hflags &= ~HF_CPL_MASK;
env->hflags |= (env->segs[R_SS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
/* XXX: restore FPU round state */
env->fpstt = (env->fpus_vmstate >> 11) & 7;
env->fpus = env->fpus_vmstate & ~0x3800;
env->fptag_vmstate ^= 0xff;
for(i = 0; i < 8; i++) {
env->fptags[i] = (env->fptag_vmstate >> i) & 1;
}
update_fp_status(env);
cpu_breakpoint_remove_all(cs, BP_CPU);
cpu_watchpoint_remove_all(cs, BP_CPU);