motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-01 23:03:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

division by zero FPU exception support

Browse source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@795 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-05-08 21:08:41 +00:00
parent 28c3ee3fed
commit 2ee73ac3a8
5 changed files with 64 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

31
target-i386/helper.c
View file

@ -24,7 +24,7 @@
#if 0
#define raise_exception_err(a, b)\
do {\
printf("raise_exception line=%d\n", __LINE__);\
fprintf(logfile, "raise_exception line=%d\n", __LINE__);\
(raise_exception_err)(a, b);\
} while (0)
#endif
@ -859,10 +859,11 @@ void do_interrupt(int intno, int is_int, int error_code,
if (loglevel & (CPU_LOG_PCALL | CPU_LOG_INT)) {
if ((env->cr[0] & CR0_PE_MASK)) {
static int count;
fprintf(logfile, "%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:%08x SP=%04x:%08x",
fprintf(logfile, "%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:%08x pc=%08x SP=%04x:%08x",
count, intno, error_code, is_int,
env->hflags & HF_CPL_MASK,
env->segs[R_CS].selector, EIP,
(int)env->segs[R_CS].base + EIP,
env->segs[R_SS].selector, ESP);
if (intno == 0x0e) {
fprintf(logfile, " CR2=%08x", env->cr[2]);
@ -1990,6 +1991,32 @@ void helper_fstt_ST0_A0(void)
helper_fstt(ST0, (uint8_t *)A0);
}
void fpu_set_exception(int mask)
{
env->fpus |= mask;
if (env->fpus & (~env->fpuc & FPUC_EM))
env->fpus |= FPUS_SE | FPUS_B;
}
CPU86_LDouble helper_fdiv(CPU86_LDouble a, CPU86_LDouble b)
{
if (b == 0.0)
fpu_set_exception(FPUS_ZE);
return a / b;
}
void fpu_raise_exception(void)
{
if (env->cr[0] & CR0_NE_MASK) {
raise_exception(EXCP10_COPR);
}
#if !defined(CONFIG_USER_ONLY)
else {
cpu_set_ferr(env);
}
#endif
}
/* BCD ops */
void helper_fbld_ST0_A0(void)