diff options
Diffstat (limited to 'arch/arm/nwfpe/fpa11_cprt.c')
| -rw-r--r-- | arch/arm/nwfpe/fpa11_cprt.c | 85 |
1 files changed, 29 insertions, 56 deletions
diff --git a/arch/arm/nwfpe/fpa11_cprt.c b/arch/arm/nwfpe/fpa11_cprt.c index cbfde092e..d479ee932 100644 --- a/arch/arm/nwfpe/fpa11_cprt.c +++ b/arch/arm/nwfpe/fpa11_cprt.c @@ -20,7 +20,6 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include "config.h" #include "milieu.h" #include "softfloat.h" #include "fpopcode.h" @@ -65,37 +64,10 @@ unsigned int EmulateCPRT(const unsigned int opcode) case WFS_CODE >> 20: writeFPSR(readRegister(getRd(opcode))); break; case RFS_CODE >> 20: writeRegister(getRd(opcode),readFPSR()); break; -#if 0 - /* ?? Not at all sure about the mode checks here. Linux never - calls the emulator from a non-USR fault but we always run in SVC - mode. Is there even any point trying to emulate the way FPA11 - behaves in this respect? - - No - and I quote: 'The FPCR may only be present in some - implementations: it is there to control the hardware in an - implementation-specific manner, ... The user mode of the - ARM is not permitted to use this register, and the WFC and - RFC instructions will trap if tried from user mode.' - Therefore, we do not provide the RFC and WFC instructions. - (rmk, 3/05/1999) - */ - case WFC_CODE >> 20: - { - int mode = 0; - __asm__ volatile ("mrs %0, cpsr; and %0, %0, #0x1f;" : : "g" (mode)); - nRc = (0x13 == mode) ? 1 : 0; /* in SVC processor mode? */ - if (nRc) writeFPCR(readRegister(getRd(opcode))); - } - break; - - case RFC_CODE >> 20: - { - int mode = 0; - __asm__ volatile ("mrs %0, cpsr; and %0, %0, #0x1f;" : : "g" (mode)); - nRc = (0x13 == mode) ? 1 : 0; /* in SVC processor mode? */ - if (nRc) writeRegister(getRd(opcode),readFPCR()); break; - } - break; +#if 0 /* We currently have no use for the FPCR, so there's no point + in emulating it. */ + case WFC_CODE >> 20: writeFPCR(readRegister(getRd(opcode))); + case RFC_CODE >> 20: writeRegister(getRd(opcode),readFPCR()); break; #endif default: nRc = 0; @@ -114,24 +86,24 @@ unsigned int PerformFLT(const unsigned int opcode) { case ROUND_SINGLE: { - fpa11->fpreg[getFn(opcode)].fType = typeSingle; - fpa11->fpreg[getFn(opcode)].fValue.fSingle = + fpa11->fType[getFn(opcode)] = typeSingle; + fpa11->fpreg[getFn(opcode)].fSingle = int32_to_float32(readRegister(getRd(opcode))); } break; case ROUND_DOUBLE: { - fpa11->fpreg[getFn(opcode)].fType = typeDouble; - fpa11->fpreg[getFn(opcode)].fValue.fDouble = + fpa11->fType[getFn(opcode)] = typeDouble; + fpa11->fpreg[getFn(opcode)].fDouble = int32_to_float64(readRegister(getRd(opcode))); } break; case ROUND_EXTENDED: { - fpa11->fpreg[getFn(opcode)].fType = typeExtended; - fpa11->fpreg[getFn(opcode)].fValue.fExtended = + fpa11->fType[getFn(opcode)] = typeExtended; + fpa11->fpreg[getFn(opcode)].fExtended = int32_to_floatx80(readRegister(getRd(opcode))); } break; @@ -149,26 +121,26 @@ unsigned int PerformFIX(const unsigned int opcode) SetRoundingMode(opcode); - switch (fpa11->fpreg[Fn].fType) + switch (fpa11->fType[Fn]) { case typeSingle: { writeRegister(getRd(opcode), - float32_to_int32(fpa11->fpreg[Fn].fValue.fSingle)); + float32_to_int32(fpa11->fpreg[Fn].fSingle)); } break; case typeDouble: { writeRegister(getRd(opcode), - float64_to_int32(fpa11->fpreg[Fn].fValue.fDouble)); + float64_to_int32(fpa11->fpreg[Fn].fDouble)); } break; case typeExtended: { writeRegister(getRd(opcode), - floatx80_to_int32(fpa11->fpreg[Fn].fValue.fExtended)); + floatx80_to_int32(fpa11->fpreg[Fn].fExtended)); } break; @@ -226,27 +198,27 @@ static unsigned int PerformComparison(const unsigned int opcode) ?? Might be some mileage in avoiding this conversion if possible. Eg, if both operands are 32-bit, detect this and do a 32-bit comparison (cheaper than an 80-bit one). */ - switch (fpa11->fpreg[Fn].fType) + switch (fpa11->fType[Fn]) { case typeSingle: //fp_printk("single.\n"); - if (float32_is_nan(fpa11->fpreg[Fn].fValue.fSingle)) + if (float32_is_nan(fpa11->fpreg[Fn].fSingle)) goto unordered; - rFn = float32_to_floatx80(fpa11->fpreg[Fn].fValue.fSingle); + rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle); break; case typeDouble: //fp_printk("double.\n"); - if (float64_is_nan(fpa11->fpreg[Fn].fValue.fDouble)) + if (float64_is_nan(fpa11->fpreg[Fn].fDouble)) goto unordered; - rFn = float64_to_floatx80(fpa11->fpreg[Fn].fValue.fDouble); + rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble); break; case typeExtended: //fp_printk("extended.\n"); - if (floatx80_is_nan(fpa11->fpreg[Fn].fValue.fExtended)) + if (floatx80_is_nan(fpa11->fpreg[Fn].fExtended)) goto unordered; - rFn = fpa11->fpreg[Fn].fValue.fExtended; + rFn = fpa11->fpreg[Fn].fExtended; break; default: return 0; @@ -262,27 +234,27 @@ static unsigned int PerformComparison(const unsigned int opcode) else { //fp_printk("Fm = r%d which contains a ",Fm); - switch (fpa11->fpreg[Fm].fType) + switch (fpa11->fType[Fm]) { case typeSingle: //fp_printk("single.\n"); - if (float32_is_nan(fpa11->fpreg[Fm].fValue.fSingle)) + if (float32_is_nan(fpa11->fpreg[Fm].fSingle)) goto unordered; - rFm = float32_to_floatx80(fpa11->fpreg[Fm].fValue.fSingle); + rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle); break; case typeDouble: //fp_printk("double.\n"); - if (float64_is_nan(fpa11->fpreg[Fm].fValue.fDouble)) + if (float64_is_nan(fpa11->fpreg[Fm].fDouble)) goto unordered; - rFm = float64_to_floatx80(fpa11->fpreg[Fm].fValue.fDouble); + rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble); break; case typeExtended: //fp_printk("extended.\n"); - if (floatx80_is_nan(fpa11->fpreg[Fm].fValue.fExtended)) + if (floatx80_is_nan(fpa11->fpreg[Fm].fExtended)) goto unordered; - rFm = fpa11->fpreg[Fm].fValue.fExtended; + rFm = fpa11->fpreg[Fm].fExtended; break; default: return 0; @@ -303,6 +275,7 @@ static unsigned int PerformComparison(const unsigned int opcode) the data sheet, observation of how the Acorn emulator actually behaves (and how programs expect it to) and guesswork. */ flags |= CC_OVERFLOW; + flags &= ~(CC_ZERO | CC_NEGATIVE); if (BIT_AC & readFPSR()) flags |= CC_CARRY; |