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bed5fced7b1b9a2aa55f05cfc68033a6f406bd6a
pcem/includes/private/cpu/x86_flags.h
Michael J. Manley bed5fced7b [no ci] Format Changes
2022-06-23 11:26:13 -07:00

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#ifndef _X86_FLAGS_H_
#define _X86_FLAGS_H_
extern int tempc;
enum {
FLAGS_UNKNOWN,
FLAGS_ZN8,
FLAGS_ZN16,
FLAGS_ZN32,
FLAGS_ADD8,
FLAGS_ADD16,
FLAGS_ADD32,
FLAGS_SUB8,
FLAGS_SUB16,
FLAGS_SUB32,
FLAGS_SHL8,
FLAGS_SHL16,
FLAGS_SHL32,
FLAGS_SHR8,
FLAGS_SHR16,
FLAGS_SHR32,
FLAGS_SAR8,
FLAGS_SAR16,
FLAGS_SAR32,
FLAGS_ROL8,
FLAGS_ROL16,
FLAGS_ROL32,
FLAGS_ROR8,
FLAGS_ROR16,
FLAGS_ROR32,
FLAGS_INC8,
FLAGS_INC16,
FLAGS_INC32,
FLAGS_DEC8,
FLAGS_DEC16,
FLAGS_DEC32,
FLAGS_ADC8,
FLAGS_ADC16,
FLAGS_ADC32,
FLAGS_SBC8,
FLAGS_SBC16,
FLAGS_SBC32
};
static inline int ZF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ZN8:
case FLAGS_ZN16:
case FLAGS_ZN32:
case FLAGS_ADD8:
case FLAGS_ADD16:
case FLAGS_ADD32:
case FLAGS_SUB8:
case FLAGS_SUB16:
case FLAGS_SUB32:
case FLAGS_SHL8:
case FLAGS_SHL16:
case FLAGS_SHL32:
case FLAGS_SHR8:
case FLAGS_SHR16:
case FLAGS_SHR32:
case FLAGS_SAR8:
case FLAGS_SAR16:
case FLAGS_SAR32:
case FLAGS_INC8:
case FLAGS_INC16:
case FLAGS_INC32:
case FLAGS_DEC8:
case FLAGS_DEC16:
case FLAGS_DEC32:
case FLAGS_ADC8:
case FLAGS_ADC16:
case FLAGS_ADC32:
case FLAGS_SBC8:
case FLAGS_SBC16:
case FLAGS_SBC32:
return !cpu_state.flags_res;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & Z_FLAG;
}
return 0;
}
static inline int NF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ZN8:
case FLAGS_ADD8:
case FLAGS_SUB8:
case FLAGS_SHL8:
case FLAGS_SHR8:
case FLAGS_SAR8:
case FLAGS_INC8:
case FLAGS_DEC8:
case FLAGS_ADC8:
case FLAGS_SBC8:
return cpu_state.flags_res & 0x80;
case FLAGS_ZN16:
case FLAGS_ADD16:
case FLAGS_SUB16:
case FLAGS_SHL16:
case FLAGS_SHR16:
case FLAGS_SAR16:
case FLAGS_INC16:
case FLAGS_DEC16:
case FLAGS_ADC16:
case FLAGS_SBC16:
return cpu_state.flags_res & 0x8000;
case FLAGS_ZN32:
case FLAGS_ADD32:
case FLAGS_SUB32:
case FLAGS_SHL32:
case FLAGS_SHR32:
case FLAGS_SAR32:
case FLAGS_INC32:
case FLAGS_DEC32:
case FLAGS_ADC32:
case FLAGS_SBC32:
return cpu_state.flags_res & 0x80000000;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & N_FLAG;
}
return 0;
}
static inline int PF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ZN8:
case FLAGS_ZN16:
case FLAGS_ZN32:
case FLAGS_ADD8:
case FLAGS_ADD16:
case FLAGS_ADD32:
case FLAGS_SUB8:
case FLAGS_SUB16:
case FLAGS_SUB32:
case FLAGS_SHL8:
case FLAGS_SHL16:
case FLAGS_SHL32:
case FLAGS_SHR8:
case FLAGS_SHR16:
case FLAGS_SHR32:
case FLAGS_SAR8:
case FLAGS_SAR16:
case FLAGS_SAR32:
case FLAGS_INC8:
case FLAGS_INC16:
case FLAGS_INC32:
case FLAGS_DEC8:
case FLAGS_DEC16:
case FLAGS_DEC32:
case FLAGS_ADC8:
case FLAGS_ADC16:
case FLAGS_ADC32:
case FLAGS_SBC8:
case FLAGS_SBC16:
case FLAGS_SBC32:
return znptable8[cpu_state.flags_res & 0xff] & P_FLAG;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & P_FLAG;
}
return 0;
}
static inline int VF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ZN8:
case FLAGS_ZN16:
case FLAGS_ZN32:
case FLAGS_SAR8:
case FLAGS_SAR16:
case FLAGS_SAR32:
return 0;
case FLAGS_ADC8:
case FLAGS_ADD8:
case FLAGS_INC8:
return !((cpu_state.flags_op1 ^ cpu_state.flags_op2) & 0x80) &&
((cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x80);
case FLAGS_ADC16:
case FLAGS_ADD16:
case FLAGS_INC16:
return !((cpu_state.flags_op1 ^ cpu_state.flags_op2) & 0x8000) &&
((cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x8000);
case FLAGS_ADC32:
case FLAGS_ADD32:
case FLAGS_INC32:
return !((cpu_state.flags_op1 ^ cpu_state.flags_op2) & 0x80000000) &&
((cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x80000000);
case FLAGS_SBC8:
case FLAGS_SUB8:
case FLAGS_DEC8:
return ((cpu_state.flags_op1 ^ cpu_state.flags_op2) & (cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x80);
case FLAGS_SBC16:
case FLAGS_SUB16:
case FLAGS_DEC16:
return ((cpu_state.flags_op1 ^ cpu_state.flags_op2) & (cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x8000);
case FLAGS_SBC32:
case FLAGS_SUB32:
case FLAGS_DEC32:
return ((cpu_state.flags_op1 ^ cpu_state.flags_op2) & (cpu_state.flags_op1 ^ cpu_state.flags_res) & 0x80000000);
case FLAGS_SHL8:
return (((cpu_state.flags_op1 << cpu_state.flags_op2) ^ (cpu_state.flags_op1 << (cpu_state.flags_op2 - 1))) &
0x80);
case FLAGS_SHL16:
return (((cpu_state.flags_op1 << cpu_state.flags_op2) ^ (cpu_state.flags_op1 << (cpu_state.flags_op2 - 1))) &
0x8000);
case FLAGS_SHL32:
return (((cpu_state.flags_op1 << cpu_state.flags_op2) ^ (cpu_state.flags_op1 << (cpu_state.flags_op2 - 1))) &
0x80000000);
case FLAGS_SHR8:
return ((cpu_state.flags_op2 == 1) && (cpu_state.flags_op1 & 0x80));
case FLAGS_SHR16:
return ((cpu_state.flags_op2 == 1) && (cpu_state.flags_op1 & 0x8000));
case FLAGS_SHR32:
return ((cpu_state.flags_op2 == 1) && (cpu_state.flags_op1 & 0x80000000));
case FLAGS_ROL8:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 7)) & 1;
case FLAGS_ROL16:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 15)) & 1;
case FLAGS_ROL32:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 31)) & 1;
case FLAGS_ROR8:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x40;
case FLAGS_ROR16:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x4000;
case FLAGS_ROR32:
return (cpu_state.flags_res ^ (cpu_state.flags_res >> 1)) & 0x40000000;
case FLAGS_UNKNOWN:
return cpu_state.flags & V_FLAG;
}
return 0;
}
static inline int AF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ZN8:
case FLAGS_ZN16:
case FLAGS_ZN32:
case FLAGS_SHL8:
case FLAGS_SHL16:
case FLAGS_SHL32:
case FLAGS_SHR8:
case FLAGS_SHR16:
case FLAGS_SHR32:
case FLAGS_SAR8:
case FLAGS_SAR16:
case FLAGS_SAR32:
return 0;
case FLAGS_ADD8:
case FLAGS_ADD16:
case FLAGS_ADD32:
case FLAGS_INC8:
case FLAGS_INC16:
case FLAGS_INC32:
return ((cpu_state.flags_op1 & 0xF) + (cpu_state.flags_op2 & 0xF)) & 0x10;
case FLAGS_ADC8:
return ((cpu_state.flags_res & 0xf) < (cpu_state.flags_op1 & 0xf)) ||
((cpu_state.flags_res & 0xf) == (cpu_state.flags_op1 & 0xf) && cpu_state.flags_op2 == 0xff);
case FLAGS_ADC16:
return ((cpu_state.flags_res & 0xf) < (cpu_state.flags_op1 & 0xf)) ||
((cpu_state.flags_res & 0xf) == (cpu_state.flags_op1 & 0xf) && cpu_state.flags_op2 == 0xffff);
case FLAGS_ADC32:
return ((cpu_state.flags_res & 0xf) < (cpu_state.flags_op1 & 0xf)) ||
((cpu_state.flags_res & 0xf) == (cpu_state.flags_op1 & 0xf) && cpu_state.flags_op2 == 0xffffffff);
case FLAGS_SUB8:
case FLAGS_SUB16:
case FLAGS_SUB32:
case FLAGS_DEC8:
case FLAGS_DEC16:
case FLAGS_DEC32:
return ((cpu_state.flags_op1 & 0xF) - (cpu_state.flags_op2 & 0xF)) & 0x10;
case FLAGS_SBC8:
case FLAGS_SBC16:
case FLAGS_SBC32:
return ((cpu_state.flags_op1 & 0xf) < (cpu_state.flags_op2 & 0xf)) ||
((cpu_state.flags_op1 & 0xf) == (cpu_state.flags_op2 & 0xf) && (cpu_state.flags_res & 0xf) != 0);
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
case FLAGS_ROR8:
case FLAGS_ROR16:
case FLAGS_ROR32:
case FLAGS_UNKNOWN:
return cpu_state.flags & A_FLAG;
}
return 0;
}
static inline int CF_SET() {
switch (cpu_state.flags_op) {
case FLAGS_ADD8:
return ((cpu_state.flags_op1 + cpu_state.flags_op2) & 0x100) ? 1 : 0;
case FLAGS_ADD16:
return ((cpu_state.flags_op1 + cpu_state.flags_op2) & 0x10000) ? 1 : 0;
case FLAGS_ADD32:
return (cpu_state.flags_res < cpu_state.flags_op1);
case FLAGS_ADC8:
return (cpu_state.flags_res < cpu_state.flags_op1) ||
(cpu_state.flags_res == cpu_state.flags_op1 && cpu_state.flags_op2 == 0xff);
case FLAGS_ADC16:
return (cpu_state.flags_res < cpu_state.flags_op1) ||
(cpu_state.flags_res == cpu_state.flags_op1 && cpu_state.flags_op2 == 0xffff);
case FLAGS_ADC32:
return (cpu_state.flags_res < cpu_state.flags_op1) ||
(cpu_state.flags_res == cpu_state.flags_op1 && cpu_state.flags_op2 == 0xffffffff);
case FLAGS_SUB8:
case FLAGS_SUB16:
case FLAGS_SUB32:
return (cpu_state.flags_op1 < cpu_state.flags_op2);
case FLAGS_SBC8:
case FLAGS_SBC16:
case FLAGS_SBC32:
return (cpu_state.flags_op1 < cpu_state.flags_op2) ||
(cpu_state.flags_op1 == cpu_state.flags_op2 && cpu_state.flags_res != 0);
case FLAGS_SHL8:
return ((cpu_state.flags_op1 << (cpu_state.flags_op2 - 1)) & 0x80) ? 1 : 0;
case FLAGS_SHL16:
return ((cpu_state.flags_op1 << (cpu_state.flags_op2 - 1)) & 0x8000) ? 1 : 0;
case FLAGS_SHL32:
return ((cpu_state.flags_op1 << (cpu_state.flags_op2 - 1)) & 0x80000000) ? 1 : 0;
case FLAGS_SHR8:
case FLAGS_SHR16:
case FLAGS_SHR32:
return (cpu_state.flags_op1 >> (cpu_state.flags_op2 - 1)) & 1;
case FLAGS_SAR8:
return ((int8_t)cpu_state.flags_op1 >> (cpu_state.flags_op2 - 1)) & 1;
case FLAGS_SAR16:
return ((int16_t)cpu_state.flags_op1 >> (cpu_state.flags_op2 - 1)) & 1;
case FLAGS_SAR32:
return ((int32_t)cpu_state.flags_op1 >> (cpu_state.flags_op2 - 1)) & 1;
case FLAGS_ZN8:
case FLAGS_ZN16:
case FLAGS_ZN32:
return 0;
case FLAGS_ROL8:
case FLAGS_ROL16:
case FLAGS_ROL32:
return cpu_state.flags_res & 1;
case FLAGS_ROR8:
return (cpu_state.flags_res & 0x80) ? 1 : 0;
case FLAGS_ROR16:
return (cpu_state.flags_res & 0x8000) ? 1 : 0;
case FLAGS_ROR32:
return (cpu_state.flags_res & 0x80000000) ? 1 : 0;
case FLAGS_DEC8:
case FLAGS_DEC16:
case FLAGS_DEC32:
case FLAGS_INC8:
case FLAGS_INC16:
case FLAGS_INC32:
case FLAGS_UNKNOWN:
return cpu_state.flags & C_FLAG;
}
return 0;
}
//#define ZF_SET() (flags & Z_FLAG)
//#define NF_SET() (flags & N_FLAG)
//#define PF_SET() (flags & P_FLAG)
//#define VF_SET() (flags & V_FLAG)
//#define CF_SET() (flags & C_FLAG)
//#define AF_SET() (flags & A_FLAG)
static inline void flags_rebuild() {
if (cpu_state.flags_op != FLAGS_UNKNOWN) {
uint16_t tempf = 0;
if (CF_SET())
tempf |= C_FLAG;
if (PF_SET())
tempf |= P_FLAG;
if (AF_SET())
tempf |= A_FLAG;
if (ZF_SET())
tempf |= Z_FLAG;
if (NF_SET())
tempf |= N_FLAG;
if (VF_SET())
tempf |= V_FLAG;
cpu_state.flags = (cpu_state.flags & ~0x8d5) | tempf;
cpu_state.flags_op = FLAGS_UNKNOWN;
}
}
static inline void flags_extract() { cpu_state.flags_op = FLAGS_UNKNOWN; }
static inline void flags_rebuild_c() {
if (cpu_state.flags_op != FLAGS_UNKNOWN) {
if (CF_SET())
cpu_state.flags |= C_FLAG;
else
cpu_state.flags &= ~C_FLAG;
}
}
static inline int flags_res_valid() {
if (cpu_state.flags_op == FLAGS_UNKNOWN || (cpu_state.flags_op >= FLAGS_ROL8 && cpu_state.flags_op <= FLAGS_ROR32))
return 0;
return 1;
}
static inline void setznp8(uint8_t val) {
cpu_state.flags_op = FLAGS_ZN8;
cpu_state.flags_res = val;
}
static inline void setznp16(uint16_t val) {
cpu_state.flags_op = FLAGS_ZN16;
cpu_state.flags_res = val;
}
static inline void setznp32(uint32_t val) {
cpu_state.flags_op = FLAGS_ZN32;
cpu_state.flags_res = val;
}
#define set_flags_shift(op, orig, shift, res) \
cpu_state.flags_op = op; \
cpu_state.flags_res = res; \
cpu_state.flags_op1 = orig; \
cpu_state.flags_op2 = shift;
#define set_flags_rotate(op, res) \
cpu_state.flags_op = op; \
cpu_state.flags_res = res;
static inline void setadd8(uint8_t a, uint8_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b) & 0xff;
cpu_state.flags_op = FLAGS_ADD8;
}
static inline void setadd16(uint16_t a, uint16_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b) & 0xffff;
cpu_state.flags_op = FLAGS_ADD16;
}
static inline void setadd32(uint32_t a, uint32_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a + b;
cpu_state.flags_op = FLAGS_ADD32;
}
static inline void setadd8nc(uint8_t a, uint8_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b) & 0xff;
cpu_state.flags_op = FLAGS_INC8;
}
static inline void setadd16nc(uint16_t a, uint16_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b) & 0xffff;
cpu_state.flags_op = FLAGS_INC16;
}
static inline void setadd32nc(uint32_t a, uint32_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a + b;
cpu_state.flags_op = FLAGS_INC32;
}
static inline void setsub8(uint8_t a, uint8_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - b) & 0xff;
cpu_state.flags_op = FLAGS_SUB8;
}
static inline void setsub16(uint16_t a, uint16_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - b) & 0xffff;
cpu_state.flags_op = FLAGS_SUB16;
}
static inline void setsub32(uint32_t a, uint32_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a - b;
cpu_state.flags_op = FLAGS_SUB32;
}
static inline void setsub8nc(uint8_t a, uint8_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - b) & 0xff;
cpu_state.flags_op = FLAGS_DEC8;
}
static inline void setsub16nc(uint16_t a, uint16_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - b) & 0xffff;
cpu_state.flags_op = FLAGS_DEC16;
}
static inline void setsub32nc(uint32_t a, uint32_t b) {
flags_rebuild_c();
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a - b;
cpu_state.flags_op = FLAGS_DEC32;
}
static inline void setadc8(uint8_t a, uint8_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b + tempc) & 0xff;
cpu_state.flags_op = FLAGS_ADC8;
}
static inline void setadc16(uint16_t a, uint16_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a + b + tempc) & 0xffff;
cpu_state.flags_op = FLAGS_ADC16;
}
static inline void setadc32(uint32_t a, uint32_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a + b + tempc;
cpu_state.flags_op = FLAGS_ADC32;
}
static inline void setsbc8(uint8_t a, uint8_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - (b + tempc)) & 0xff;
cpu_state.flags_op = FLAGS_SBC8;
}
static inline void setsbc16(uint16_t a, uint16_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = (a - (b + tempc)) & 0xffff;
cpu_state.flags_op = FLAGS_SBC16;
}
static inline void setsbc32(uint32_t a, uint32_t b) {
cpu_state.flags_op1 = a;
cpu_state.flags_op2 = b;
cpu_state.flags_res = a - (b + tempc);
cpu_state.flags_op = FLAGS_SBC32;
}
extern void cpu_386_flags_extract();
extern void cpu_386_flags_rebuild();
#endif /* _X86_FLAGS_H_ */
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