342 lines
6 KiB
C
342 lines
6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <strings.h>
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#include <math.h>
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#include "emu.h"
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#define BO4 (1<<0)
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#define BO3 (1<<1)
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#define BO2 (1<<2)
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#define BO1 (1<<3)
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#define BO0 (1<<4)
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#define XER_SO (1<<31)
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#define XER_OV (1<<30)
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#define XER_CA (1<<29)
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cpu_t cpu;
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static inline bool carry(void)
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{
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fatal("carry() not supported yet");
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}
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/* Byte-swaps a 16-bit value. */
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static inline uint16_t swb16(uint16_t n)
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{
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return
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(((n >> 8) & 0xff) |
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((n & 0xff) << 8));
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}
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/* Byte-swaps a 32-bit value. */
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static inline uint32_t swb32(uint32_t n)
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{
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return
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(((n & 0xff000000) >> 24) |
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((n & 0x00ff0000) >> 8) |
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((n & 0x0000ff00) << 8) |
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((n & 0x000000ff) << 24));
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}
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/* Returns the state of a carry flag after a three-way add. */
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static inline bool carry_3(uint32_t a, uint32_t b, uint32_t c)
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{
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if ((a+b) < a)
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return true;
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if ((a+b+c) < c)
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return true;
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return false;
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}
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static inline uint32_t reg(uint8_t n)
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{
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return cpu.gpr[n];
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}
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static inline uint32_t reg0(uint8_t n)
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{
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if (n == 0)
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return 0;
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return cpu.gpr[n];
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}
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/* Double to bytes */
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static inline uint64_t d2b(double n)
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{
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return *(uint64_t*)&n;
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}
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/* Float to bytes */
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static inline uint32_t f2b(float n)
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{
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return *(uint32_t*)&n;
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}
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/* Bytes to double */
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static inline double b2d(uint64_t n)
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{
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return *(double*)&n;
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}
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/* Bytes to float */
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static inline float b2f(uint32_t n)
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{
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return *(float*)&n;
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}
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static inline double fpr(uint8_t n)
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{
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return b2d(cpu.fpr[n]);
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}
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static inline uint32_t ext8(int8_t n)
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{
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return (n << 24) >> 24;
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}
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static inline uint32_t ext16(int16_t n)
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{
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return (n << 16) >> 16;
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}
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static inline uint32_t ext26(int32_t n)
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{
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return (n << 6) >> 6;
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}
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static bool getcr(uint8_t bit)
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{
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bit = 31 - bit; /* note PowerPC bit numbering */
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return cpu.cr & (1<<bit);
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}
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static void setcr(uint8_t bit, bool value)
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{
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bit = 31 - bit; /* note PowerPC bit numbering */
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cpu.cr = cpu.cr & ~(1<<bit) | (value<<bit);
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}
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static void setcr0(bool setcr0, uint32_t value)
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{
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if (setcr0)
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{
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setcr(0, (int32_t)value < 0);
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setcr(1, (int32_t)value > 0);
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setcr(2, value == 0);
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setcr(3, cpu.xer & (1<<31));
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}
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}
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static void setcr1(bool setcr1, uint64_t value)
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{
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if (setcr1)
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fatal("setcr1 not implemented yet");
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}
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static void mcrf(uint8_t destfield, uint8_t srcfield)
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{
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fatal("mcrf not supported yet");
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}
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static void branch(uint8_t bo, uint8_t bi, uint32_t dest, bool a_bit, bool l_bit)
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{
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bool bo0 = bo & BO0;
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bool bo1 = bo & BO1;
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bool bo2 = bo & BO2;
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bool bo3 = bo & BO3;
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bool ctr_ok;
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bool cond_ok;
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if (!bo2)
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cpu.ctr--;
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ctr_ok = bo2 || (!!cpu.ctr ^ bo3);
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cond_ok = bo0 || (!!(cpu.cr & (1<<(31-bi))) == bo1);
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if (ctr_ok && cond_ok)
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{
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if (a_bit)
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cpu.nia = dest;
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else
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cpu.nia = dest + cpu.cia;
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}
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if (l_bit)
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cpu.lr = cpu.cia + 4;
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}
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static void read_multiple(uint32_t address, uint8_t reg)
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{
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while (reg != 32)
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{
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cpu.gpr[reg] = read_long(address);
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reg++;
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address += 4;
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}
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}
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static void write_multiple(uint32_t address, uint8_t reg)
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{
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while (reg != 32)
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{
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write_long(address, cpu.gpr[reg]);
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reg++;
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address += 4;
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}
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}
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static void read_string(uint32_t address, uint8_t reg, uint8_t bytes)
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{
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fatal("read_string not supported yet");
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}
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static void write_string(uint32_t address, uint8_t reg, uint8_t bytes)
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{
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fatal("write_string not supported yet");
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}
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static uint32_t addo(uint32_t a, uint32_t b, uint32_t c, bool set_o, bool set_c)
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{
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if (set_o)
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fatal("can't use O bit in add yet");
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if (set_c)
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{
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cpu.xer = cpu.xer & ~XER_CA;
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if (carry_3(a, b, c))
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cpu.xer = cpu.xer | XER_CA;
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}
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return a + b + c;
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}
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static uint32_t mulo(uint32_t a, uint32_t b, bool set_o)
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{
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if (set_o)
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fatal("can't use O bit in mul yet");
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return a * b;
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}
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static int32_t divo(int32_t a, int32_t b, bool set_o)
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{
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if (set_o)
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fatal("can't use O bit in div yet");
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if (b == 0)
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return 0;
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return a / b;
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}
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static uint32_t divuo(uint32_t a, uint32_t b, bool set_o)
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{
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if (set_o)
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fatal("can't use O bit in divu yet");
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if (b == 0)
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return 0;
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return a / b;
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}
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static void compares(int32_t a, int32_t b, uint8_t field)
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{
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uint8_t bit = field*4;
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setcr(bit+0, a<b);
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setcr(bit+1, a>b);
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setcr(bit+2, a==b);
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setcr(bit+3, cpu.xer & (1<<31));
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}
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static void compareu(uint32_t a, uint32_t b, uint8_t field)
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{
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uint8_t bit = field*4;
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setcr(bit+0, a<b);
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setcr(bit+1, a>b);
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setcr(bit+2, a==b);
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setcr(bit+3, cpu.xer & (1<<31));
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}
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static void comparef(double a, double b, uint8_t field)
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{
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uint8_t c;
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if (isnan(a) || isnan(b))
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c = 0x1;
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else if (a < b)
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c = 0x8;
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else if (a > b)
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c = 0x4;
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else
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c = 0x2;
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uint8_t bit = 28 - field*4; /* note PowerPC bit numbering */
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cpu.cr = cpu.cr & ~(0xf<<bit) | (c<<bit);
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/* TODO: ordered/unordered, FSPCR, etc. */
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}
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static uint32_t cntlzw(uint32_t source)
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{
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return 32 - ffs(source);
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}
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static uint32_t popcntb(uint32_t source)
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{
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fatal("popcntb not supported");
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}
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static uint32_t rotate(uint32_t i, uint32_t shift)
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{
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return (i << shift) | (i >> (32-shift));
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}
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static uint32_t rlwnm(uint32_t source, uint8_t shift, uint8_t mb, uint8_t me)
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{
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uint8_t masksize = 1 + me - mb; /* me and mb are inclusive */
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uint32_t mask = (((uint64_t)1<<masksize)-1) << (31 - me);
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return rotate(source, shift) & mask;
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}
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static uint32_t rlwmi(uint32_t source, uint8_t shift, uint8_t mb, uint8_t me)
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{
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fatal("rlwmi not supported");
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}
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static void mtcrf(uint8_t fxm, uint32_t value)
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{
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fatal("mtcrf not supported");
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}
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static void dispatch(uint32_t value)
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{
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#include "dispatcher.h"
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fatal("unimplemented instruction 0x%0x (major opcode %d)", value, value>>26);
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}
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void dump_state(FILE* stream)
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{
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int i;
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fprintf(stream, "\n");
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fprintf(stream, "pc=0x%08x lr=0x%08x ctr=0x%08x xer=0x%08x cr=0x%08x",
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cpu.cia, cpu.lr, cpu.ctr, cpu.xer, cpu.cr);
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for (i=0; i<32; i++)
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{
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if ((i % 4) == 0)
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fprintf(stream, "\n");
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fprintf(stream, "gpr%02d=0x%08x ", i, cpu.gpr[i]);
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}
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fprintf(stderr, "\n");
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/* This might fail and cause a reentrant trap if cia is invalid, so
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* do it last. */
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fprintf(stream, "insn=0x%08x\n", read_long(cpu.cia));
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}
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void single_step(void)
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{
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uint32_t value = read_long(cpu.cia);
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cpu.nia = cpu.cia + 4;
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dispatch(value);
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cpu.cia = cpu.nia;
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}
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