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dyncom: Remove VFP_REG_ZERO 

Fixes two issues that will never happen:

1. There are cases when VFP_REG_ZERO will be non-zero, but these will
   never be encoutered in well behaved guest code (i.e. writing to D16).

2. If CONFIG_VFPv3 is defined, accessing VFP_REG_ZERO would be out of
   bounds.
This commit is contained in:
MerryMage 2017-12-02 12:06:48 +00:00
parent fcf0d104c9
commit b37a850654
2 changed files with 6 additions and 16 deletions
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9
src/core/arm/skyeye_common/vfp/vfp_helper.h
View File

@ -301,15 +301,6 @@ struct vfp_double {
u64 significand;
};
// VFP_REG_ZERO is a special register number for vfp_get_double
// which returns (double)0.0. This is useful for the compare with
// zero instructions.
#ifdef CONFIG_VFPv3
#define VFP_REG_ZERO 32
#else
#define VFP_REG_ZERO 16
#endif
#define VFP_DOUBLE_MANTISSA_BITS (52)
#define VFP_DOUBLE_EXPONENT_BITS (11)
#define VFP_DOUBLE_LOW_BITS (64 - VFP_DOUBLE_MANTISSA_BITS - 2)

13
src/core/arm/skyeye_common/vfp/vfpdouble.cpp
View File

@ -383,12 +383,11 @@ static u32 vfp_double_fsqrt(ARMul_State* state, int dd, int unused, int dm, u32
* Greater than := C
* Unordered := CV
*/
static u32 vfp_compare(ARMul_State* state, int dd, int signal_on_qnan, int dm, u32 fpscr) {
s64 d, m;
static u32 vfp_compare(ARMul_State* state, int dd, int signal_on_qnan, s64 m, u32 fpscr) {
s64 d;
u32 ret = 0;
LOG_TRACE(Core_ARM11, "In %s, state=0x%p, fpscr=0x%x", __FUNCTION__, state, fpscr);
m = vfp_get_double(state, dm);
if (vfp_double_packed_exponent(m) == 2047 && vfp_double_packed_mantissa(m)) {
ret |= FPSCR_CFLAG | FPSCR_VFLAG;
if (signal_on_qnan ||
@ -451,22 +450,22 @@ static u32 vfp_compare(ARMul_State* state, int dd, int signal_on_qnan, int dm, u
static u32 vfp_double_fcmp(ARMul_State* state, int dd, int unused, int dm, u32 fpscr) {
LOG_TRACE(Core_ARM11, "In %s", __FUNCTION__);
return vfp_compare(state, dd, 0, dm, fpscr);
return vfp_compare(state, dd, 0, vfp_get_double(state, dm), fpscr);
}
static u32 vfp_double_fcmpe(ARMul_State* state, int dd, int unused, int dm, u32 fpscr) {
LOG_TRACE(Core_ARM11, "In %s", __FUNCTION__);
return vfp_compare(state, dd, 1, dm, fpscr);
return vfp_compare(state, dd, 1, vfp_get_double(state, dm), fpscr);
}
static u32 vfp_double_fcmpz(ARMul_State* state, int dd, int unused, int dm, u32 fpscr) {
LOG_TRACE(Core_ARM11, "In %s", __FUNCTION__);
return vfp_compare(state, dd, 0, VFP_REG_ZERO, fpscr);
return vfp_compare(state, dd, 0, 0, fpscr);
}
static u32 vfp_double_fcmpez(ARMul_State* state, int dd, int unused, int dm, u32 fpscr) {
LOG_TRACE(Core_ARM11, "In %s", __FUNCTION__);
return vfp_compare(state, dd, 1, VFP_REG_ZERO, fpscr);
return vfp_compare(state, dd, 1, 0, fpscr);
}
static u32 vfp_double_fcvts(ARMul_State* state, int sd, int unused, int dm, u32 fpscr) {