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-rw-r--r--sim/h8300/ChangeLog4
-rw-r--r--sim/h8300/compile.c1637
2 files changed, 1641 insertions, 0 deletions
diff --git a/sim/h8300/ChangeLog b/sim/h8300/ChangeLog
index 68217e1..b7834f0 100644
--- a/sim/h8300/ChangeLog
+++ b/sim/h8300/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jul 4 00:35:41 1993 Doug Evans (dje@canuck.cygnus.com)
+
+ * compile.c (sim_csize): Initialize cpu.cache.
+
Fri Jul 2 17:42:59 1993 Doug Evans (dje@canuck.cygnus.com)
* Makefile.in: Add -I../../bfd to pick up bfd.h.
diff --git a/sim/h8300/compile.c b/sim/h8300/compile.c
new file mode 100644
index 0000000..b349027
--- /dev/null
+++ b/sim/h8300/compile.c
@@ -0,0 +1,1637 @@
+/*
+ * Simulator for the Hitachi H8/300 architecture.
+ *
+ * Written by Steve Chamberlain of Cygnus Support. sac@cygnus.com
+ *
+ * This file is part of H8/300 sim
+ *
+ *
+ * THIS SOFTWARE IS NOT COPYRIGHTED
+ *
+ * Cygnus offers the following for use in the public domain. Cygnus makes no
+ * warranty with regard to the software or its performance and the user
+ * accepts the software "AS IS" with all faults.
+ *
+ * CYGNUS DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO THIS
+ * SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <signal.h>
+#include "sysdep.h"
+#include <sys/times.h>
+#include <sys/param.h>
+
+
+int debug;
+
+
+#define X(op, size) op*4+size
+
+#define SP (Hmode ? SL:SW)
+#define SB 0
+#define SW 1
+#define SL 2
+#define OP_REG 1
+#define OP_DEC 2
+#define OP_DISP 3
+#define OP_INC 4
+#define OP_PCREL 5
+#define OP_MEM 6
+#define OP_CCR 7
+#define OP_IMM 8
+#define OP_ABS 10
+#define h8_opcodes ops
+#define DEFINE_TABLE
+#include "opcode/h8300.h"
+
+#include "inst.h"
+
+#define LOW_BYTE(x) ((x) & 0xff)
+#define HIGH_BYTE(x) (((x)>>8) & 0xff)
+#define P(X,Y) ((X<<8) | Y)
+
+#define BUILDSR() cpu.ccr = (N << 3) | (Z << 2) | (V<<1) | C;
+
+#define GETSR() \
+ c = (cpu.ccr >> 0) & 1;\
+ v = (cpu.ccr >> 1) & 1;\
+ nz = !((cpu.ccr >> 2) & 1);\
+ n = (cpu.ccr >> 3) & 1;
+
+#ifdef __CHAR_IS_SIGNED__
+#define SEXTCHAR(x) ((char)(x))
+#endif
+
+#ifndef SEXTCHAR
+#define SEXTCHAR(x) ((x & 0x80) ? (x | ~0xff):x)
+#endif
+
+#define UEXTCHAR(x) ((x) & 0xff)
+#define UEXTSHORT(x) ((x) & 0xffff)
+#define SEXTSHORT(x) ((short)(x))
+
+static cpu_state_type cpu;
+
+int Hmode;
+
+
+static int
+get_now ()
+{
+ struct tms b;
+ times (&b);
+ return b.tms_utime + b.tms_stime;
+}
+
+static int
+now_persec ()
+{
+ return 50;
+}
+
+
+static int
+bitfrom (x)
+{
+
+ switch (x & SIZE)
+ {
+ case L_8:
+ return SB;
+ case L_16:
+ return SW;
+ case L_32:
+ return SL;
+ case L_P:
+ return Hmode ? SL : SW;
+ }
+
+}
+
+static
+unsigned int
+lvalue (x, rn)
+{
+ switch (x / 4)
+ {
+ case OP_DISP:
+ if (rn == 8)
+ {
+ return X(OP_IMM,SP);
+ }
+ return X(OP_REG,SP);
+
+ case OP_MEM:
+
+ return X (OP_MEM, SP);
+ default:
+ abort ();
+ }
+}
+
+static unsigned int
+decode (addr, data, dst)
+ int addr;
+ unsigned char *data;
+ decoded_inst *dst;
+
+{
+ int rs = 0;
+ int rd = 0;
+ int rdisp = 0;
+ int abs = 0;
+ int plen = 0;
+
+ struct h8_opcode *q = h8_opcodes;
+ int size = 0;
+ dst->dst.type = -1;
+ dst->src.type = -1;
+ /* Find the exact opcode/arg combo */
+ while (q->name)
+ {
+ op_type *nib;
+ unsigned int len = 0;
+
+ nib = q->data.nib;
+
+ while (1)
+ {
+ op_type looking_for = *nib;
+ int thisnib = data[len >> 1];
+
+ thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
+
+ if (looking_for < 16)
+ {
+
+ if (looking_for != thisnib)
+ goto fail;
+ }
+ else
+ {
+
+ if ((int) looking_for & (int) B31)
+ {
+ if (!(((int) thisnib & 0x8) != 0))
+ goto fail;
+ looking_for = (op_type) ((int) looking_for & ~(int)
+ B31);
+ thisnib &= 0x7;
+
+ }
+ if ((int) looking_for & (int) B30)
+ {
+ if (!(((int) thisnib & 0x8) == 0))
+ goto fail;
+ looking_for = (op_type) ((int) looking_for & ~(int) B30);
+ }
+ if (looking_for & DBIT)
+ {
+ if ((looking_for & 5) != (thisnib &5)) goto fail;
+ abs = (thisnib & 0x8) ? 2 : 1;
+ }
+ else if (looking_for & (REG | IND | INC | DEC))
+ {
+ if (looking_for & REG)
+ {
+ /*
+ * Can work out size from the
+ * register
+ */
+ size = bitfrom (looking_for);
+ }
+ if (looking_for & SRC)
+ {
+ rs = thisnib;
+ }
+ else
+ {
+ rd = thisnib;
+ }
+ }
+ else if (looking_for & L_16)
+ {
+ abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
+ plen = 16;
+ if (looking_for & (PCREL|DISP))
+ {
+ abs = (short) (abs);
+ }
+ }
+ else if (looking_for & ABSJMP)
+ {
+ abs =
+ (data[1] << 16)
+ | (data[2] << 8)
+ | (data[3]);
+ }
+ else if (looking_for & L_32)
+ {
+ int i = len >> 1;
+ abs = (data[i] << 24)
+ | (data[i + 1] << 16)
+ | (data[i + 2] << 8)
+ | (data[i + 3]);
+
+ plen = 32;
+
+ }
+ else if (looking_for & L_24)
+ {
+ int i = len >> 1;
+ abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i +
+ 2]);
+ plen = 24;
+ }
+ else if (looking_for & IGNORE)
+ {
+
+ }
+ else if (looking_for & DISPREG)
+ {
+ rdisp = thisnib & 0x7;
+ }
+ else if (looking_for & KBIT)
+ {
+ switch (thisnib)
+ {
+ case 9:
+ abs = 4;
+ break;
+ case 8:
+ abs = 2;
+ break;
+ case 0:
+ abs = 1;
+ break;
+ }
+ }
+ else if (looking_for & L_8)
+ {
+ plen = 8;
+
+ if (looking_for & PCREL)
+ {
+ abs = SEXTCHAR (data[len >> 1]);
+ }
+ else
+ {
+ abs = data[len >> 1] & 0xff;
+ }
+ }
+ else if (looking_for & L_3)
+ {
+ plen = 3;
+
+ abs = thisnib;
+ }
+ else if (looking_for == E)
+ {
+ dst->op = q;
+
+ /* Fill in the args */
+ {
+ op_type *args = q->args.nib;
+ int hadone = 0;
+
+
+ while (*args != E)
+ {
+ int x = *args;
+ int rn = (x & DST) ? rd : rs;
+ ea_type *p;
+
+ if (x & DST)
+ {
+ p = &(dst->dst);
+ }
+ else
+ {
+ p = &(dst->src);
+ }
+
+
+ if (x & (IMM | KBIT | DBIT))
+ {
+ p->type = X (OP_IMM, size);
+ p->literal = abs;
+ }
+ else if (x & REG)
+ {
+ /*
+ Reset the size, some
+ ops (like mul) have two sizes */
+
+ size = bitfrom (x);
+ p->type = X (OP_REG, size);
+ p->reg = rn;
+ }
+ else if (x & INC)
+ {
+ p->type = X (OP_INC, size);
+ p->reg = rn & 0x7;
+ }
+ else if (x & DEC)
+ {
+ p->type = X (OP_DEC, size);
+ p->reg = rn & 0x7;
+ }
+ else if (x & IND)
+ {
+ p->type = X (OP_DISP, size);
+ p->reg = rn & 0x7;
+ p->literal = 0;
+ }
+ else if (x & (ABS | ABSJMP | ABSMOV))
+ {
+ p->type = X (OP_DISP, size);
+ p->literal = abs;
+ p->reg = 8;
+ }
+ else if (x & MEMIND)
+ {
+ p->type = X (OP_MEM, size);
+ p->literal = abs;
+ }
+ else if (x & PCREL)
+ {
+ p->type = X (OP_PCREL, size);
+ p->literal = abs + addr + 2;
+ }
+ else if (x & ABSJMP)
+ {
+ p->type = X (OP_IMM, SP);
+ p->literal = abs;
+ }
+ else if (x & DISP)
+ {
+ p->type = X (OP_DISP, size);
+ p->literal = abs;
+ p->reg = rdisp & 0x7;
+ }
+ else if (x & CCR)
+ {
+ p->type = OP_CCR;
+ }
+ else
+ printf ("Hmmmm %x", x);
+
+
+ args++;
+ }
+ }
+
+ /*
+ * But a jmp or a jsr gets
+ * automagically lvalued, since we
+ * branch to their address not their
+ * contents
+ */
+ if (q->how == O (O_JSR, SB)
+ || q->how == O (O_JMP, SB))
+ {
+ dst->src.type = lvalue (dst->src.type, dst->src.reg);
+ }
+
+
+ if (dst->dst.type == -1)
+ dst->dst = dst->src;
+
+ dst->opcode = q->how;
+ dst->cycles = q->time;
+
+ /* And a jsr to 0xc4 is turned into a magic trap */
+
+ if (dst->opcode == O(O_JSR, SB))
+ {
+ if(dst->src.literal == 0xc4)
+ {
+ dst->opcode = O(O_SYSCALL,SB);
+ }
+ }
+
+ dst->next_pc = addr + len / 2;
+ return;
+ }
+ else
+ {
+ printf ("Dont understand %x \n", looking_for);
+ }
+ }
+
+ len++;
+ nib++;
+ }
+
+ fail:
+ q++;
+ }
+
+ dst->opcode = O (O_ILL, SB);
+}
+
+
+static void
+compile (pc)
+{
+ int idx;
+
+ /* find the next cache entry to use */
+
+ idx = cpu.cache_top + 1;
+ cpu.compiles++;
+ if (idx >= cpu.csize)
+ {
+ idx = 1;
+ }
+ cpu.cache_top = idx;
+
+ /* Throw away its old meaning */
+ cpu.cache_idx[cpu.cache[idx].oldpc] = 0;
+
+ /* set to new address */
+ cpu.cache[idx].oldpc = pc;
+
+ /* fill in instruction info */
+ decode (pc, cpu.memory + pc, cpu.cache + idx);
+
+ /* point to new cache entry */
+ cpu.cache_idx[pc] = idx;
+}
+
+
+static unsigned char *breg[18];
+static unsigned short *wreg[18];
+static unsigned int *lreg[18];
+
+#define GET_B_REG(x) *(breg[x])
+#define SET_B_REG(x,y) (*(breg[x])) = (y)
+#define GET_W_REG(x) *(wreg[x])
+#define SET_W_REG(x,y) (*(wreg[x])) = (y)
+
+#define GET_L_REG(x) *(lreg[x])
+#define SET_L_REG(x,y) (*(lreg[x])) = (y)
+
+#define GET_MEMORY_L(x) \
+ ((cpu.memory[x+0] << 24) | (cpu.memory[x+1] << 16) | (cpu.memory[x+2] << 8) | cpu.memory[x+3])
+
+#define GET_MEMORY_W(x) \
+ ((cpu.memory[x+0] << 8) | (cpu.memory[x+1] << 0))
+
+
+#define SET_MEMORY_B(x,y) \
+ (cpu.memory[(x)] = y)
+
+#define SET_MEMORY_W(x,y) \
+{register unsigned char *_p = cpu.memory+x;\
+ register int __y = y;\
+ _p[0] = (__y)>>8;\
+ _p[1] =(__y); }
+
+#define SET_MEMORY_L(x,y) \
+{register unsigned char *_p = cpu.memory+x;register int __y = y;\
+ _p[0] = (__y)>>24; _p[1] = (__y)>>16; _p[2] = (__y)>>8; _p[3] = (__y)>>0;}
+
+#define GET_MEMORY_B(x) (cpu.memory[x])
+
+int
+ fetch (arg, n)
+ea_type *arg;
+{
+ int rn = arg->reg;
+ int abs = arg->literal;
+ int r;
+ int t;
+
+ switch (arg->type)
+ {
+ case X (OP_REG, SB):
+ return GET_B_REG (rn);
+ case X (OP_REG, SW):
+ return GET_W_REG (rn);
+ case X (OP_REG, SL):
+ return GET_L_REG (rn);
+ case X (OP_IMM, SB):
+ case X (OP_IMM, SW):
+ case X (OP_IMM, SL):
+ return abs;
+ case X (OP_DEC, SB):
+ abort();
+
+ case X(OP_INC,SB):
+ t = GET_L_REG(rn);
+ t &= cpu.mask;
+ r = GET_MEMORY_B(t);
+ t ++;
+ t = t & cpu.mask;
+ SET_L_REG(rn,t);
+ return r;
+ break;
+ case X(OP_INC,SW):
+ t = GET_L_REG(rn);
+ t &= cpu.mask;
+ r = GET_MEMORY_W(t);
+ t +=2;
+ t = t & cpu.mask;
+ SET_L_REG(rn,t);
+ return r;
+ case X(OP_INC,SL):
+ t = GET_L_REG(rn);
+ t &= cpu.mask;
+ r = GET_MEMORY_L(t);
+
+ t +=4;
+ t = t & cpu.mask;
+ SET_L_REG(rn,t);
+ return r;
+
+ case X (OP_DISP, SB):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ return GET_MEMORY_B (t);
+
+ case X (OP_DISP, SW):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ return GET_MEMORY_W (t);
+
+ case X (OP_DISP, SL):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ return GET_MEMORY_L (t);
+
+ default:
+ abort ();
+
+ }
+}
+
+
+
+
+
+static
+void store (arg, n)
+ea_type *arg;
+int n;
+{
+ int rn = arg->reg;
+ int abs = arg->literal;
+ int t;
+
+ switch (arg->type)
+ {
+ case X (OP_REG, SB):
+ SET_B_REG (rn, n);
+ break;
+ case X (OP_REG, SW):
+ SET_W_REG (rn, n);
+ break;
+ case X (OP_REG, SL):
+ SET_L_REG (rn, n);
+ break;
+
+ case X (OP_DEC, SB):
+ t = GET_L_REG (rn) - 1;
+ t &= cpu.mask;
+ SET_L_REG (rn,t);
+ SET_MEMORY_B (t, n);
+
+ break;
+ case X (OP_DEC, SW):
+ t= (GET_L_REG (rn) - 2 ) & cpu.mask;
+ SET_L_REG (rn, t);
+ SET_MEMORY_W (t, n);
+ break;
+
+ case X (OP_DEC, SL):
+ t = (GET_L_REG(rn) -4 ) & cpu.mask;
+ SET_MEMORY_L (t,n);
+ break;
+
+
+ case X (OP_DISP, SB):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ SET_MEMORY_B (t, n);
+ break;
+
+ case X (OP_DISP, SW):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ SET_MEMORY_W (t, n);
+ break;
+
+ case X (OP_DISP, SL):
+ t = GET_L_REG (rn) + abs;
+ t &= cpu.mask;
+ SET_MEMORY_L (t, n);
+ break;
+ default:
+ abort ();
+ }
+}
+
+
+static union
+ {
+ short int i;
+ struct
+ {
+ char low;
+ char high;
+ }
+ u;
+ }
+
+littleendian;
+
+static
+void
+init_pointers ()
+{
+ static int init;
+
+ if (!init)
+ {
+ int i;
+
+ init = 1;
+ littleendian.i = 1;
+
+ cpu.memory = (unsigned char *) calloc (sizeof (char), MSIZE);
+ cpu.cache_idx = (unsigned short *) calloc (sizeof (short), MSIZE);
+ cpu.mask = (1<<MPOWER)-1;
+
+ for (i = 0; i < 9; i++)
+ {
+ cpu.regs[i] = 0;
+ }
+
+ for (i = 0; i < 8; i++)
+ {
+ unsigned char *p = (unsigned char *) (cpu.regs + i);
+ unsigned char *e = (unsigned char *) (cpu.regs + i + 1);
+ unsigned short *q = (unsigned short *) (cpu.regs + i);
+ unsigned short *u = (unsigned short *) (cpu.regs + i + 1);
+ cpu.regs[i] = 0x00112233;
+ while (p < e)
+ {
+ if (*p == 0x22)
+ {
+ breg[i] = p;
+ }
+ if (*p == 0x33)
+ {
+ breg[i+8] = p;
+ }
+ p++;
+ }
+ while (q < u)
+ {
+ if (*q == 0x2233)
+ {
+ wreg[i] = q;
+ }
+ if (*q == 0x0011)
+ {
+ wreg[i + 8] = q;
+ }
+ q++;
+ }
+ cpu.regs[i] = 0;
+ lreg[i] = &cpu.regs[i];
+ }
+
+
+ lreg[8] = &cpu.regs[8];
+
+ /* initialize the seg registers */
+ if (!cpu.cache)
+ sim_csize (CSIZE);
+
+ }
+}
+
+static void
+control_c (sig, code, scp, addr)
+ int sig;
+ int code;
+ char *scp;
+ char *addr;
+{
+ cpu.exception = SIGINT;
+}
+
+#define C (c != 0)
+#define Z (nz == 0)
+#define V (v != 0)
+#define N (n != 0)
+
+int
+sim_resume (step)
+{
+ static int init1;
+ int cycles = 0;
+ int insts = 0;
+ int tick_start = get_now ();
+ void (*prev) ();
+
+ int res;
+ int tmp;
+ int rd;
+ int ea;
+ int bit;
+ int pc;
+ int c, nz, v, n;
+
+ init_pointers ();
+
+ prev = signal (SIGINT, control_c);
+
+ if (step)
+ {
+ cpu.exception = SIGTRAP;
+ }
+ else
+ {
+ cpu.exception = 0;
+ }
+
+ pc = cpu.pc;
+
+ GETSR ();
+
+ do
+ {
+ int cidx;
+ decoded_inst *code;
+
+ top:
+ cidx = cpu.cache_idx[pc];
+ code = cpu.cache + cidx;
+
+
+#define ALUOP(STORE, NAME, HOW) \
+ case O(NAME,SB): HOW; if(STORE)goto alu8;else goto just_flags_alu8; \
+ case O(NAME, SW): HOW; if(STORE)goto alu16;else goto just_flags_alu16; \
+ case O(NAME,SL): HOW; if(STORE)goto alu32;else goto just_flags_alu32;
+
+
+#define LOGOP(NAME, HOW) \
+ case O(NAME,SB): HOW; goto log8;\
+ case O(NAME, SW): HOW; goto log16;\
+ case O(NAME,SL): HOW; goto log32;
+
+
+
+#if ADEBUG
+ if (debug)
+ {
+ printf ("%x %d %s\n", pc, code->opcode,
+ code->op ? code->op->name : "**");
+ }
+ cpu.stats[code->opcode]++;
+
+#endif
+
+ cycles += code->cycles;
+ insts++;
+ switch (code->opcode)
+ {
+ case 0:
+ /*
+ * This opcode is a fake for when we get to an
+ * instruction which hasnt been compiled
+ */
+ compile (pc);
+ goto top;
+ break;
+
+
+ case O (O_SUBX, SB):
+ rd = fetch (&code->dst);
+ ea = fetch (&code->src);
+ ea = -( ea + C);
+ res = rd + ea;
+ goto alu8;
+
+ case O (O_ADDX, SB):
+ rd = fetch (&code->dst);
+ ea = fetch (&code->src);
+ ea = C + ea;
+ res = rd + ea;
+ goto alu8;
+
+#define RD rd = fetch(&code->src);
+#define RD_EA rd = fetch(&code->dst); ea = fetch(&code->src);
+
+ ALUOP (1, O_SUB, RD_EA; ea = -ea ; res = rd + ea);
+ ALUOP (1, O_NEG, RD; ea = -ea ;rd = 0; res = rd + ea);
+
+ case O(O_ADD,SB):
+ rd = GET_B_REG(code->dst.reg);
+ ea = fetch(&code->src);
+ res = rd + ea;
+ goto alu8;
+ case O(O_ADD,SW):
+ rd = GET_W_REG(code->dst.reg);
+ ea = fetch(&code->src);
+ res = rd + ea;
+ goto alu16;
+ case O(O_ADD,SL):
+ rd = GET_L_REG(code->dst.reg);
+ ea = fetch(&code->src);
+ res = rd + ea;
+ goto alu32;
+
+
+ LOGOP (O_AND, RD_EA; res = rd & ea);
+
+ LOGOP (O_OR, RD_EA; res = rd | ea);
+
+ LOGOP (O_XOR, RD_EA; res = rd ^ ea);
+
+
+ case O(O_MOV_TO_MEM,SB):
+ res = GET_B_REG(code->src.reg);
+ goto log8;
+ case O(O_MOV_TO_MEM,SW):
+ res = GET_W_REG(code->src.reg);
+ goto log16;
+ case O(O_MOV_TO_MEM,SL):
+ res = GET_L_REG(code->src.reg);
+ goto log32;
+
+
+ case O(O_MOV_TO_REG,SB):
+ res = fetch(&code->src);
+ SET_B_REG(code->dst.reg, res);
+ goto just_flags_log8;
+ case O(O_MOV_TO_REG,SW):
+ res = fetch(&code->src);
+ SET_W_REG(code->dst.reg, res);
+ goto just_flags_log16;
+ case O(O_MOV_TO_REG,SL):
+ res = fetch(&code->src);
+ SET_L_REG(code->dst.reg, res);
+ goto just_flags_log32;
+
+
+ case O(O_ADDS,SL):
+ SET_L_REG(code->dst.reg,
+ GET_L_REG(code->dst.reg)
+ + code->src.literal);
+
+ goto next;
+
+ case O(O_SUBS,SL):
+ SET_L_REG(code->dst.reg,
+ GET_L_REG(code->dst.reg)
+ - code->src.literal);
+ goto next;
+
+ case O (O_CMP, SB):
+ rd = fetch (&code->dst);
+ ea = fetch (&code->src);
+ ea = -ea;
+ res = rd + ea;
+ goto just_flags_alu8;
+
+ case O (O_CMP, SW):
+ rd = fetch (&code->dst);
+ ea = fetch (&code->src);
+ ea = -ea;
+ res = rd + ea;
+ goto just_flags_alu16;
+
+ case O (O_CMP, SL):
+ rd = fetch (&code->dst);
+ ea = fetch (&code->src);
+ ea = -ea;
+ res = rd + ea;
+ goto just_flags_alu32;
+
+
+ case O (O_DEC, SB):
+ rd = GET_B_REG (code->src.reg);
+ ea = -1;
+ res = rd + ea;
+ SET_B_REG (code->src.reg, res);
+ goto just_flags_inc8;
+
+ case O (O_DEC, SW):
+ rd = GET_W_REG (code->dst.reg);
+ ea = - code->src.literal;
+ res = rd + ea;
+ SET_W_REG (code->dst.reg, res);
+ goto just_flags_inc16;
+
+ case O (O_DEC, SL):
+ rd = GET_L_REG (code->dst.reg);
+ ea = -code->src.literal;
+ res = rd + ea;
+ SET_L_REG (code->dst.reg, res);
+ goto just_flags_inc32;
+
+
+ case O (O_INC, SB):
+ rd = GET_B_REG (code->src.reg);
+ ea = 1;
+ res = rd + ea;
+ SET_B_REG (code->src.reg, res);
+ goto just_flags_inc8;
+
+ case O (O_INC, SW):
+ rd = GET_W_REG (code->dst.reg);
+ ea = code->src.literal;
+ res = rd + ea;
+ SET_W_REG (code->dst.reg, res);
+ goto just_flags_inc16;
+
+ case O (O_INC, SL):
+ rd = GET_L_REG (code->dst.reg);
+ ea = code->src.literal;
+ res = rd + ea;
+ SET_L_REG (code->dst.reg, res);
+ goto just_flags_inc32;
+
+
+#define GET_CCR(x) BUILDSR();x = cpu.ccr
+
+ case O (O_ANDC, SB):
+ GET_CCR (rd);
+ ea = code->src.literal;
+ res = rd & ea;
+ goto setc;
+
+
+ case O (O_BRA, SB):
+ if (1)
+ goto condtrue;
+ goto next;
+
+ case O (O_BRN, SB):
+ if (0)
+ goto condtrue;
+ goto next;
+
+ case O (O_BHI, SB):
+ if ((C || Z) == 0)
+ goto condtrue;
+ goto next;
+
+
+ case O (O_BLS, SB):
+ if ((C || Z))
+ goto condtrue;
+ goto next;
+
+ case O (O_BCS, SB):
+ if ((C == 1))
+ goto condtrue;
+ goto next;
+
+ case O (O_BCC, SB):
+ if ((C == 0))
+ goto condtrue;
+ goto next;
+
+ case O (O_BEQ, SB):
+ if (Z)
+ goto condtrue;
+ goto next;
+ case O (O_BGT, SB):
+ if (((Z || (N ^ V)) == 0))
+ goto condtrue;
+ goto next;
+
+
+ case O (O_BLE, SB):
+ if (((Z || (N ^ V)) == 1))
+ goto condtrue;
+ goto next;
+
+ case O (O_BGE, SB):
+ if ((N ^ V) == 0)
+ goto condtrue;
+ goto next;
+ case O (O_BLT, SB):
+ if ((N ^ V))
+ goto condtrue;
+ goto next;
+ case O (O_BMI, SB):
+ if ((N))
+ goto condtrue;
+ goto next;
+ case O (O_BNE, SB):
+ if ((Z == 0))
+ goto condtrue;
+ goto next;
+
+ case O (O_BPL, SB):
+ if (N == 0)
+ goto condtrue;
+ goto next;
+ case O (O_BVC, SB):
+ if ((V == 0))
+ goto condtrue;
+ goto next;
+ case O (O_BVS, SB):
+ if ((V == 1))
+ goto condtrue;
+ goto next;
+
+ case O(O_SYSCALL, SB):
+ printf("%c", cpu.regs[2]);
+ goto next;
+
+
+
+#define OSHIFTS(name, how) \
+case O(name, SB):{ int t;int hm = 0x80; rd = GET_B_REG(code->src.reg);how; goto shift8;} \
+case O(name, SW):{ int t;int hm = 0x8000; rd = GET_W_REG(code->src.reg); how; goto shift16;} \
+case O(name, SL):{ int t;int hm = 0x80000000; rd = GET_L_REG(code->src.reg);how; goto shift32;}
+
+
+ OSHIFTS(O_NOT, rd = ~rd);
+ OSHIFTS(O_SHLL, c = rd & hm; rd<<=1);
+ OSHIFTS(O_SHLR, c = rd & 1; rd>>=1);
+ OSHIFTS(O_SHAL, c = rd & hm; rd<<=1);
+ OSHIFTS(O_SHAR, t = rd & hm; c = rd&1;rd>>=1;rd|=t;);
+ OSHIFTS(O_ROTL, c = rd & hm; rd <<=1; rd|= C);
+ OSHIFTS(O_ROTR, c = rd &1 ; rd >>=1; if (c) rd|= hm;);
+ OSHIFTS(O_ROTXL,t = rd & hm; rd<<=1; rd|=C; c=t;);
+ OSHIFTS(O_ROTXR,t = rd & 1; rd>>=1; if (C) rd|=hm; c=t;);
+
+ case O(O_JMP, SB):
+ {
+ pc = fetch (&code->src);
+ goto end;
+
+ }
+
+ case O (O_JSR, SB):
+ {
+ int tmp;
+ pc = fetch (&code->src);
+ call:
+ tmp = cpu.regs[7];
+
+ if (Hmode)
+ {
+ tmp -= 4;
+ SET_MEMORY_L (tmp, code->next_pc);
+ }
+ else
+ {
+ tmp -= 2;
+ SET_MEMORY_W (tmp, code->next_pc);
+ }
+ cpu.regs[7] = tmp;
+
+ goto end;
+ }
+ case O(O_BSR, SB):
+ pc = code->src.literal;
+ goto call;
+
+ case O (O_RTS, SB):
+ {
+ int tmp;
+
+
+ tmp = cpu.regs[7];
+
+ if (Hmode)
+ {
+ pc = GET_MEMORY_L (tmp);
+ tmp += 4;
+
+ }
+ else
+ {
+ pc = GET_MEMORY_W (tmp);
+ tmp += 2;
+ }
+
+ cpu.regs[7] = tmp;
+ goto end;
+ }
+
+ case O (O_ILL, SB):
+ cpu.exception = SIGILL;
+ goto end;
+
+ case O(O_BPT,SB):
+ cpu.exception = SIGTRAP;
+ goto end;
+
+#define OBITOP(name,f, s, op) \
+ case O(name, SB): {int m;int b; \
+ if (f) ea = fetch(&code->dst);\
+ m=1<<code->src.literal;\
+ op;\
+ if(s) store(&code->dst,ea); goto next;\
+ }
+ OBITOP(O_BNOT,1,1,ea ^= m);
+ OBITOP(O_BTST,1,0,nz = ea & m);
+ OBITOP(O_BLD,1,0, c = ea & m);
+ OBITOP(O_BILD,1,0, c = !(ea & m));
+ OBITOP(O_BST,1,1, ea &= ~m; if (C) ea |=m);
+ OBITOP(O_BIST,1,1, ea &= ~m; if (!C) ea |=m);
+ OBITOP(O_BAND,1,1, b = (ea & m) && C; ea &= ~m; if (b) ea |=m);
+ OBITOP(O_BIAND,1,1, b = (ea & m) && C; ea &= ~m; if (!b) ea |=m);
+ OBITOP(O_BOR,1,1, b = (ea & m) || C; ea &= ~m; if (b) ea |=m);
+ OBITOP(O_BIOR,1,1, b = (ea & m) || C; ea &= ~m; if (!b) ea |=m);
+ OBITOP(O_BXOR,1,1, b = (ea & m) != C; ea &= ~m; if (b) ea |=m);
+ OBITOP(O_BIXOR,1,1, b = (ea & m) != C; ea &= ~m; if (!b) ea |=m);
+ OBITOP(O_BCLR,1,1, ea &= ~m; );
+ OBITOP(O_BSET,1,1, ea |= m; );
+
+
+#define MOP(bsize, signed) \
+ { \
+ int multiplier; \
+ int multiplicand; \
+ int result; \
+ \
+ if (signed) \
+ { \
+ multiplicand = \
+ bsize ? SEXTCHAR(GET_W_REG(code->dst.reg)): \
+ SEXTSHORT(GET_W_REG(code->dst.reg)); \
+ multiplier = \
+ bsize ? SEXTCHAR(GET_B_REG(code->src.reg)): \
+ SEXTSHORT(GET_B_REG(code->src.reg)); \
+ } \
+ else \
+ { \
+ multiplicand = bsize ? UEXTCHAR(GET_W_REG(code->dst.reg)): \
+ UEXTSHORT(GET_W_REG(code->dst.reg)); \
+ multiplier = \
+ bsize ? UEXTCHAR(GET_B_REG(code->src.reg)): \
+ UEXTSHORT(GET_B_REG(code->src.reg)); \
+ \
+ } \
+ result = multiplier * multiplicand; \
+ \
+ if (signed) \
+ { \
+ n = result & (bsize ? 0x8000: 0x80000000); \
+ nz = result & (bsize ? 0xffff: 0xffffffff); \
+ } \
+ if (bsize) \
+ { \
+ SET_W_REG(code->dst.reg, result); \
+ } \
+ else \
+ { \
+ SET_L_REG(code->dst.reg, result); \
+ } \
+ goto next; \
+ } \
+
+ case O(O_MULS, SB): MOP(1,1);break;
+ case O(O_MULS, SW): MOP(0,1); break;
+ case O(O_MULU, SB): MOP(1,0);break;
+ case O(O_MULU, SW): MOP(0,0); break;
+
+
+ case O(O_DIVU,SB):
+ {
+
+ rd = GET_W_REG(code->dst.reg);
+ ea = GET_B_REG(code->src.reg);
+ if (ea) {
+ tmp = rd % ea;
+ rd = rd / ea;
+
+ }
+ SET_W_REG(code->dst.reg, (rd & 0xff) | (tmp << 8));
+ n = ea & 0x80;
+ nz = ea & 0xff;
+
+ goto next;
+ }
+ case O(O_DIVU,SW):
+ {
+
+ rd = GET_L_REG(code->dst.reg);
+ ea = GET_W_REG(code->src.reg);
+ n = ea & 0x8000;
+ nz = ea & 0xffff;
+ if (ea) {
+ tmp = rd % ea;
+ rd = rd / ea;
+
+ }
+ SET_L_REG(code->dst.reg, (rd & 0xffff) | (tmp << 16));
+ goto next;
+ }
+
+
+
+ case O(O_DIVS,SB):
+ {
+
+ rd = SEXTSHORT(GET_W_REG(code->dst.reg));
+ ea = SEXTCHAR(GET_B_REG(code->src.reg));
+ if (ea) {
+
+ tmp = (int)rd % (int)ea;
+ rd = (int)rd / (int)ea;
+ n = rd & 0x8000;
+ nz = 1;
+
+ }
+ else
+ nz = 0;
+ SET_W_REG(code->dst.reg, (rd & 0xff) | (tmp << 8));
+ goto next;
+ }
+ case O(O_DIVS,SW):
+ {
+
+ rd = GET_L_REG(code->dst.reg);
+ ea = SEXTSHORT(GET_W_REG(code->src.reg));
+ if (ea) {
+
+ tmp = (int)rd % (int)ea;
+ rd = (int)rd / (int)ea;
+ n = rd & 0x80000000;
+ nz = 1;
+
+ }
+ else nz =0;
+ SET_L_REG(code->dst.reg, (rd & 0xffff) | (tmp << 16));
+ goto next;
+ }
+
+
+
+ default:
+ cpu.exception = 123;
+ goto end;
+
+ }
+ abort ();
+
+ setc:
+ GETSR();
+ goto next;
+
+ condtrue:
+ /* When a branch works */
+ pc = code->src.literal;
+ goto end;
+
+ /* Set the cond codes from res */
+ bitop:
+
+ /* Set the flags after an 8 bit inc/dec operation */
+ just_flags_inc8:
+ n = res & 0x80;
+ nz = res & 0xff;
+ v = (rd & 0x7f) == 0x7f;
+ goto next;
+
+
+ /* Set the flags after an 16 bit inc/dec operation */
+ just_flags_inc16:
+ n = res & 0x8000;
+ nz = res & 0xffff;
+ v = (rd & 0x7fff) == 0x7fff;
+ goto next;
+
+
+ /* Set the flags after an 32 bit inc/dec operation */
+ just_flags_inc32:
+ n = res & 0x80000000;
+ nz = res & 0xffffffff;
+ v = (rd & 0x7fffffff) == 0x7fffffff;
+ goto next;
+
+
+ shift8:
+ /* Set flags after an 8 bit shift op, carry set in insn */
+ n = (rd & 0x80);
+ v = 0;
+ nz = rd & 0xff;
+ SET_B_REG(code->src.reg, rd);
+ goto next;
+
+
+ shift16:
+ /* Set flags after an 16 bit shift op, carry set in insn */
+ n = (rd & 0x8000);
+ v = 0;
+ nz = rd & 0xffff;
+
+ SET_W_REG(code->src.reg, rd);
+ goto next;
+
+
+ shift32:
+ /* Set flags after an 32 bit shift op, carry set in insn */
+ n = (rd & 0x80000000);
+ v = 0;
+ nz = rd & 0xffffffff;
+ SET_L_REG(code->src.reg, rd);
+ goto next;
+
+
+ log32:
+ store (&code->dst, res);
+ just_flags_log32:
+ /* flags after a 32bit logical operation */
+ n = res & 0x80000000;
+ nz = res & 0xffffffff;
+ v = 0;
+ goto next;
+
+ log16:
+ store (&code->dst, res);
+ just_flags_log16:
+ /* flags after a 16bit logical operation */
+ n = res & 0x8000;
+ nz = res & 0xffff;
+ v = 0;
+ goto next;
+
+
+ log8:
+ store (&code->dst, res);
+ just_flags_log8:
+ n = res & 0x80;
+ nz = res & 0xff;
+ v = 0;
+ goto next;
+
+ alu8:
+ SET_B_REG (code->dst.reg, res);
+ just_flags_alu8:
+ n = res & 0x80;
+ nz = res & 0xff;
+ v = ((ea & 0x80) == (rd & 0x80)) && ((ea & 0x80) != (res & 0x80));
+ c = (res & 0x100);
+ goto next;
+
+ alu16:
+ SET_W_REG (code->dst.reg, res);
+ just_flags_alu16:
+ n = res & 0x8000;
+ nz = res & 0xffff;
+ v = ((ea & 0x8000) == (rd & 0x8000)) && ((ea & 0x8000) != (res & 0x8000));
+ c = (res & 0x10000);
+ goto next;
+
+ alu32:
+ SET_L_REG (code->dst.reg, res);
+ just_flags_alu32:
+ n = res & 0x80000000;
+ nz = res & 0xffffffff;
+ v = ((ea & 0x80000000) == (rd & 0x80000000))
+ && ((ea & 0x80000000) != (res & 0x80000000));
+ c = (res < rd) || (res < ea);
+ goto next;
+
+ next:;
+ pc = code->next_pc;
+
+ end:
+ if (cpu.regs[8] ) abort();
+
+ ;
+
+}
+ while (!cpu.exception);
+ cpu.ticks += get_now () - tick_start;
+ cpu.cycles += cycles;
+ cpu.insts += insts;
+ cpu.pc = pc;
+ BUILDSR ();
+
+ signal (SIGINT, prev);
+}
+
+
+
+
+void
+sim_write (addr, buffer, size)
+ long int addr;
+ unsigned char *buffer;
+ int size;
+{
+ int i;
+
+ init_pointers ();
+ if (addr < 0 || addr + size > MSIZE)
+ return;
+ for (i = 0; i < size; i++)
+ {
+ cpu.memory[addr + i] = buffer[i];
+ cpu.cache_idx[addr + i] = 0;
+ }
+}
+
+void
+sim_read (addr, buffer, size)
+ long int addr;
+ char *buffer;
+ int size;
+{
+ init_pointers ();
+ if (addr < 0 || addr + size > MSIZE)
+ return;
+ memcpy (buffer, cpu.memory + addr, size);
+}
+
+
+
+#define R0_REGNUM 0
+#define R1_REGNUM 1
+#define R2_REGNUM 2
+#define R3_REGNUM 3
+#define R4_REGNUM 4
+#define R5_REGNUM 5
+#define R6_REGNUM 6
+#define R7_REGNUM 7
+
+#define SP_REGNUM R7_REGNUM /* Contains address of top of stack */
+#define FP_REGNUM R6_REGNUM /* Contains address of executing
+ * stack frame */
+
+#define CCR_REGNUM 8 /* Contains processor status */
+#define PC_REGNUM 9 /* Contains program counter */
+
+#define CYCLE_REGNUM 10
+#define INST_REGNUM 11
+#define TICK_REGNUM 12
+
+
+void
+sim_store_register (rn, value)
+ int rn;
+ int value;
+{
+
+ init_pointers ();
+ switch (rn)
+ {
+ case PC_REGNUM:
+ cpu.pc = value;
+ break;
+ default:
+ abort ();
+ case R0_REGNUM:
+ case R1_REGNUM:
+ case R2_REGNUM:
+ case R3_REGNUM:
+ case R4_REGNUM:
+ case R5_REGNUM:
+ case R6_REGNUM:
+ case R7_REGNUM:
+ cpu.regs[rn] = value;
+ break;
+ case CCR_REGNUM:
+ cpu.ccr = value;
+ break;
+ case CYCLE_REGNUM:
+ cpu.cycles = value;
+ break;
+
+ case INST_REGNUM:
+ cpu.insts = value;
+ break;
+
+ case TICK_REGNUM:
+ cpu.ticks = value;
+ break;
+ }
+}
+
+void
+sim_fetch_register (rn, buf)
+ int rn;
+ char *buf;
+{
+ int v;
+ int longreg = 0;
+
+ init_pointers ();
+
+ switch (rn)
+ {
+ default:
+ abort ();
+ case 8:
+ v = cpu.ccr;
+ break;
+ case 9:
+ v = cpu.pc;
+ break;
+ case R0_REGNUM:
+ case R1_REGNUM:
+ case R2_REGNUM:
+ case R3_REGNUM:
+ case R4_REGNUM:
+ case R5_REGNUM:
+ case R6_REGNUM:
+ case R7_REGNUM:
+ v = cpu.regs[rn];
+ break;
+ case 10:
+ v = cpu.cycles;
+ longreg = 1;
+
+ break;
+ case 11:
+ v = cpu.ticks;
+ longreg = 1;
+ break;
+ case 12:
+ v = cpu.insts;
+ longreg = 1;
+ break;
+
+ }
+ if (Hmode || longreg)
+ {
+ buf[0] = v >> 24;
+ buf[1] = v >> 16;
+ buf[2] = v >> 8;
+ buf[3] = v >> 0;
+ }
+ else
+ {
+ buf[0] = v >> 8;
+ buf[1] = v;
+ }
+}
+
+int
+sim_trace ()
+{
+ return 0;
+}
+
+sim_stop_signal ()
+{
+ return cpu.exception;
+}
+
+sim_set_pc (n)
+{
+ sim_store_register (PC_REGNUM, n);
+}
+
+
+sim_csize (n)
+{
+ if (cpu.cache)
+ free (cpu.cache);
+ if (n < 2)
+ n = 2;
+ cpu.cache = (decoded_inst *) malloc (sizeof (decoded_inst) * n);
+ memset (cpu.cache, 0, sizeof (decoded_inst) * n);
+ cpu.csize = n;
+}
+
+
+
+void
+sim_info (verbose)
+ int verbose;
+
+{
+ double timetaken = (double) cpu.ticks / (double) now_persec ();
+ double virttime = cpu.cycles / 10.0e6;
+
+
+ printf ("\n\n#instructions executed %10d\n", cpu.insts);
+ printf ("#cycles (v approximate) %10d\n", cpu.cycles);
+ printf ("#real time taken %10.4f\n", timetaken);
+ printf ("#virtual time taked %10.4f\n", virttime);
+ if (timetaken != 0.0)
+ printf ("#simulation ratio %10.4f\n", virttime / timetaken);
+ printf ("#compiles %10d\n", cpu.compiles);
+ printf ("#cache size %10d\n", cpu.csize);
+
+
+#ifdef ADEBUG
+ if (verbose)
+ {
+ int i;
+ for (i= 0; i < O_LAST; i++)
+ {
+ if (cpu.stats[i])
+ printf("%d: %d\n", i, cpu.stats[i]);
+ }
+ }
+#endif
+}
+
generated by cgit v1.1 at 2024-11-26 23:53:56 +0000