* size: 16
* desc: Status register. From MAME: bits 0-9 are CONTROL, other FLAG
* fedc ba98 7654 3210
- * 210 - RPL (?) (e: "loop size", fir16_32.sc)
+ * 210 - RPL (?) "Loop size". If non-zero, makes (rX+) and (rX-) respectively
+ * modulo-increment and modulo-decrement. The value shows which
+ * power of 2 to use, i.e. 4 means modulo by 16.
+ * (e: fir16_32.sc, IIR_4B.SC, DECIM.SC)
* 43 - RB (?)
- * 5 - GP0_0 (ST5?) Changed before acessing AL (affects banking?).
- * 6 - GP0_1 (ST6?) Cleared before acessing AL (affects banking?). Set after.
- * 7 - IE (?) Not used by SVP code (never set, but preserved)?
- * 8 - OP (?) Not used by SVP code (only cleared)?
+ * 5 - GP0_0 (ST5?) Changed before acessing PM0 (affects banking?).
+ * 6 - GP0_1 (ST6?) Cleared before acessing PM0 (affects banking?). Set after.
+ * datasheet says these (5,6) bits correspond to hardware pins.
+ * 7 - IE (?) Not directly used by SVP code (never set, but preserved)?
+ * 8 - OP (?) Not used by SVP code (only cleared)? (MAME: saturated value
+ * (probably means clamping? i.e. 0x7ffc + 9 -> 0x7fff))
* 9 - MACS (?) Not used by SVP code (only cleared)? (e: "mac shift")
* a - GPI_0 Interrupt 0 enable/status?
* b - GPI_1 Interrupt 1 enable/status?
*
*
* There are 8 8-bit pointer registers rX. r0-r3 (ri) point to RAM0, r4-r7 (rj) point to RAM1.
- * They can be accessed directly, or 2 indirection levels can be used [ (r0), ((r0)) ],
- * which work similar to * and ** operators in C.
+ * They can be accessed directly, or 2 indirection levels can be used [ (rX), ((rX)) ],
+ * which work similar to * and ** operators in C, only they use different memory banks and
+ * ((rX)) also does post-increment. First indirection level (rX) accesses RAMx, second accesses
+ * program memory at address read from (rX), and increments value in (rX).
*
* r0,r1,r2,r4,r5,r6 can be modified [ex: ldi r0, 5].
* 3 modifiers can be applied (optional):
- * + : post-increment [ex: ld a, (r0+) ]
- * - : post-decrement
- * +!: same as '+' ???
+ * + : post-increment [ex: ld a, (r0+) ]. Can be made modulo-increment by setting RPL bits in ST.
+ * - : post-decrement. Can be made modulo-decrement by setting RPL bits in ST (not sure).
+ * +!: post-increment, unaffected by RPL (probably).
+ * These are only used on 1st indirection level, so things like [ld a, ((r0+))] and [ld X, r6-]
+ * ar probably invalid.
*
* r3 and r7 are special and can not be changed (at least Samsung samples and SVP code never do).
* They are fixed to the start of their RAM banks. (They are probably changeable for ssp1605+,
*
* Assumptions in this code
* P is not directly writeable
+ * flags correspond to full 32bit accumulator
+ * only Z and N status flags are emulated (others unused by SVP)
+ * modifiers for 'OP a, ri' are ignored (invalid?/not used by SVP)
+ * modifiers '+' and '+!' act the same (this is most likely wrong)
+ * 'ld d, (a)' loads from program ROM
*/
#include "../../PicoInt.h"
#define rPMC ssp->gr[SSP_PMC] // will keep addr in .h, mode in .l
#define rAL ssp->gr[SSP_A].l
-#define GET_PC() (PC - (unsigned short *)Pico.rom)
-#define GET_PC_OFFS() ((unsigned int)PC - (unsigned int)Pico.rom)
-#define SET_PC(d) PC = (unsigned short *)Pico.rom + d
+#define rA32 ssp->gr[SSP_A].v
+#define rIJ ssp->r
+
+#define IJind (((op>>6)&4)|(op&3))
+
+#define GET_PC() (PC - (unsigned short *)svp->iram_rom)
+#define GET_PPC_OFFS() ((unsigned int)PC - (unsigned int)svp->iram_rom - 2)
+#define SET_PC(d) PC = (unsigned short *)svp->iram_rom + d
#define REG_READ(r) (((r) <= 4) ? ssp->gr[r].h : read_handlers[r]())
+// if r is 'A', should we set flags?
#define REG_WRITE(r,d) { \
int r1 = r; \
- if (r1 > 4) write_handlers[r1](d); \
+ if (r1 >= 4) write_handlers[r1](d); \
else if (r1 > 0) ssp->gr[r1].h = d; \
}
+// flags
+#define FLAG_L (1<<0xc)
+#define FLAG_Z (1<<0xd)
+#define FLAG_V (1<<0xe)
+#define FLAG_N (1<<0xf)
+
+// update ZN according to 32bit ACC.
+#define UPD_ACC_ZN \
+ rST &= ~(FLAG_Z|FLAG_N); \
+ if (!rA32) rST |= FLAG_Z; \
+ else rST |= (rA32>>16)&FLAG_N;
+
+// it seems SVP code never checks for L and OV, so we leave them out.
+// rST |= (t>>4)&FLAG_L;
+#define UPD_t_LZVN \
+ rST &= ~(FLAG_L|FLAG_Z|FLAG_V|FLAG_N); \
+ if (!t) rST |= FLAG_Z; \
+ else rST |= t&FLAG_N; \
+
+// standard cond processing.
+// again, only Z and N is checked, as SVP doesn't seem to use any other conds.
+#define COND_CHECK \
+ switch (op&0xf0) { \
+ case 0x00: cond = 1; break; /* always true */ \
+ case 0x50: cond = !((rST ^ (op<<5)) & FLAG_Z); break; /* Z matches f(?) bit */ \
+ case 0x70: cond = !((rST ^ (op<<7)) & FLAG_N); break; /* N matches f(?) bit */ \
+ default:elprintf(EL_SVP, "unimplemented cond @ %04x", GET_PPC_OFFS()); break; \
+ }
+
+// ops with accumulator.
+// how is low word really affected by these?
+// not sure if 'ld A' affects flags (assume it does..)
+#define OP_LDA(x) \
+ ssp->gr[SSP_A].h = x; \
+ UPD_ACC_ZN
+
+#define OP_SUBA(x) { \
+ u32 t = (ssp->gr[SSP_A].v >> 16) - (x); \
+ UPD_t_LZVN \
+ ssp->gr[SSP_A].h = t; \
+}
+
+#define OP_CMPA(x) { \
+ u32 t = (ssp->gr[SSP_A].v >> 16) - (x); \
+ UPD_t_LZVN \
+}
+
+#define OP_ADDA(x) { \
+ u32 t = (ssp->gr[SSP_A].v >> 16) + (x); \
+ UPD_t_LZVN \
+ ssp->gr[SSP_A].h = t; \
+}
+
+#define OP_ANDA(x) \
+ ssp->gr[SSP_A].v &= (x) << 16; \
+ UPD_ACC_ZN
+
+#define OP_ORA(x) \
+ ssp->gr[SSP_A].v |= (x) << 16; \
+ UPD_ACC_ZN
+
+#define OP_EORA(x) \
+ ssp->gr[SSP_A].v ^= (x) << 16; \
+ UPD_ACC_ZN
+
+
static ssp1601_t *ssp = NULL;
static unsigned short *PC;
static int g_cycles;
+// debug
+static int running = 0;
// -----------------------------------------------------
// register i/o handlers
// 0-4, 13
static u32 read_unknown(void)
{
- elprintf(EL_ANOMALY|EL_SVP, "ssp16: unknown read @ %04x", GET_PC_OFFS());
+ elprintf(EL_ANOMALY|EL_SVP, "ssp16: unknown read @ %04x", GET_PPC_OFFS());
return 0;
}
static void write_unknown(u32 d)
{
- elprintf(EL_ANOMALY|EL_SVP, "ssp16: unknown write @ %04x", GET_PC_OFFS());
+ elprintf(EL_ANOMALY|EL_SVP, "ssp16: unknown write @ %04x", GET_PPC_OFFS());
+}
+
+// 4
+static void write_ST(u32 d)
+{
+ if ((rST ^ d) & 7) {
+ elprintf(EL_SVP, "ssp16: RPL %i -> %i @ %04x", rST&7, d&7, GET_PPC_OFFS());
+ running = 0;
+ }
+ rST = d;
}
// 5
static u32 read_STACK(void)
{
- u32 d = 0;
- if (rSTACK < 6) {
- d = ssp->stack[rSTACK];
- rSTACK++;
- } else
- elprintf(EL_ANOMALY|EL_SVP, "ssp16: stack underflow! (%i) @ %04x", rSTACK, GET_PC_OFFS());
- return d;
+ //elprintf(EL_SVP, "pop %i @ %04x", rSTACK, GET_PPC_OFFS());
+ --rSTACK;
+ if ((short)rSTACK < 0) {
+ rSTACK = 5;
+ elprintf(EL_ANOMALY|EL_SVP, "ssp16: stack underflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
+ }
+ return ssp->stack[rSTACK];
}
static void write_STACK(u32 d)
{
- if (rSTACK > 0) {
- rSTACK--;
- ssp->stack[rSTACK] = d;
- } else
- elprintf(EL_ANOMALY|EL_SVP, "ssp16: stack overflow! (%i) @ %04x", rSTACK, GET_PC_OFFS());
+ if (rSTACK >= 6) {
+ //running = 0;
+ elprintf(EL_ANOMALY|EL_SVP, "ssp16: stack overflow! (%i) @ %04x", rSTACK, GET_PPC_OFFS());
+ rSTACK = 0;
+ }
+ ssp->stack[rSTACK++] = d;
}
// 6
return rP.h;
}
+// -----------------------------------------------------
+
+static void iram_write(int addr, u32 d, int reg, int inc)
+{
+ if ((addr&0xfc00) != 0x8000)
+ elprintf(EL_SVP|EL_ANOMALY, "ssp invalid IRAM addr: %04x", addr<<1);
+ elprintf(EL_SVP, "ssp IRAM w [%06x] %04x (inc %i)", (addr<<1)&0x7ff, d, inc);
+ ((unsigned short *)svp->iram_rom)[addr&0x3ff] = d;
+ ssp->pmac_write[reg] += inc<<16;
+}
+
static u32 pm_io(int reg, int write, u32 d)
{
if (ssp->emu_status & SSP_PMC_SET) {
- elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PC_OFFS());
+ elprintf(EL_SVP, "PM%i (%c) set to %08x @ %04x", reg, write ? 'w' : 'r', rPMC.v, GET_PPC_OFFS());
ssp->pmac_read[write ? reg + 6 : reg] = rPMC.v;
ssp->emu_status &= ~SSP_PMC_SET;
return 0;
}
- if (ssp->pmac_read[reg] != 0) {
- elprintf(EL_SVP, "PM%i %c @ %04x", reg, write ? 'w' : 'r', GET_PC_OFFS());
- // do something depending on mode
+ // just in case
+ ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
+
+// if (ssp->pmac_read[reg] != 0)
+ if (reg == 4 || (rST & 0x60))
+ {
+ if (write)
+ {
+ int mode = ssp->pmac_write[reg]&0xffff;
+ int addr = ssp->pmac_write[reg]>>16;
+ switch (mode) {
+ case 0x0018: elprintf(EL_SVP, "ssp DRAM w [%06x] %04x", addr<<1, d);
+ ((unsigned short *)svp->dram)[addr] = d;
+ break;
+ case 0x0818: elprintf(EL_SVP, "ssp DRAM w [%06x] %04x (inc 1)", addr<<1, d);
+ ((unsigned short *)svp->dram)[addr] = d;
+ ssp->pmac_write[reg] += 1<<16;
+ break;
+ case 0x081c: iram_write(addr, d, reg, 1); break; // checked: used by code @ 0902
+ case 0x101c: iram_write(addr, d, reg, 2); break; // checked: used by code @ 3b7c
+ default: elprintf(EL_SVP|EL_ANOMALY, "ssp PM%i unhandled write mode %04x, [%06x] %04x @ %04x",
+ reg, mode, addr<<1, d, GET_PPC_OFFS()); break;
+ }
+ }
+ else
+ {
+ int mode = ssp->pmac_read[reg]&0xffff;
+ int addr = ssp->pmac_read[reg]>>16;
+ switch (mode) {
+ case 0x0809: elprintf(EL_SVP, "ssp ROM r [%06x] %04x", (addr|((mode&0xf)<<16))<<1,
+ ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)]);
+ // possibly correct, the first word read is some sort of counter, sane values in ROM
+ ssp->pmac_read[reg] += 1<<16;
+ return ((unsigned short *)Pico.rom)[addr|((mode&0xf)<<16)];
+ case 0x0018: elprintf(EL_SVP, "ssp DRAM r [%06x] %04x", addr<<1, ((unsigned short *)svp->dram)[addr]);
+ return ((unsigned short *)svp->dram)[addr]; // checked
+ case 0x0818: elprintf(EL_SVP, "ssp DRAM r [%06x] %04x (inc 1)", addr<<1, ((unsigned short *)svp->dram)[addr]);
+ ssp->pmac_read[reg] += 1<<16;
+ return ((unsigned short *)svp->dram)[addr];
+ case 0x3018: elprintf(EL_SVP, "ssp DRAM r [%06x] %04x (inc 32)", addr<<1, ((unsigned short *)svp->dram)[addr]);
+ ssp->pmac_read[reg] += 32<<16;
+ return ((unsigned short *)svp->dram)[addr];
+ default: elprintf(EL_SVP|EL_ANOMALY, "ssp PM%i unhandled read mode %04x, [%06x] @ %04x",
+ reg, mode, addr<<1, GET_PPC_OFFS()); break;
+ }
+ }
return 0;
}
{
u32 d = pm_io(0, 0, 0);
if (d != (u32)-1) return d;
- elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PC_OFFS());
+ if (GET_PPC_OFFS() != 0x800 || rPM0 != 0) // debug
+ elprintf(EL_SVP, "PM0 raw r %04x @ %04x", rPM0, GET_PPC_OFFS());
return rPM0;
}
{
u32 r = pm_io(0, 1, d);
if (r != (u32)-1) return;
- elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PC_OFFS());
+ elprintf(EL_SVP, "PM0 raw w %04x @ %04x", d, GET_PPC_OFFS());
rPM0 = d;
}
u32 d = pm_io(1, 0, 0);
if (d != (u32)-1) return d;
// can be removed?
- elprintf(EL_SVP, "PM1 raw r %04x @ %04x", rPM1, GET_PC_OFFS());
- return rPM0;
+ elprintf(EL_SVP, "PM1 raw r %04x @ %04x", rPM1, GET_PPC_OFFS());
+ return rPM1;
}
static void write_PM1(u32 d)
u32 r = pm_io(1, 1, d);
if (r != (u32)-1) return;
// can be removed?
- elprintf(EL_SVP, "PM1 raw w %04x @ %04x", d, GET_PC_OFFS());
- rPM0 = d;
+ elprintf(EL_SVP, "PM1 raw w %04x @ %04x", d, GET_PPC_OFFS());
+ rPM1 = d;
}
// 10
u32 d = pm_io(2, 0, 0);
if (d != (u32)-1) return d;
// can be removed?
- elprintf(EL_SVP, "PM2 raw r %04x @ %04x", rPM2, GET_PC_OFFS());
- return rPM0;
+ elprintf(EL_SVP, "PM2 raw r %04x @ %04x", rPM2, GET_PPC_OFFS());
+ return rPM2;
}
static void write_PM2(u32 d)
u32 r = pm_io(2, 1, d);
if (r != (u32)-1) return;
// can be removed?
- elprintf(EL_SVP, "PM2 raw w %04x @ %04x", d, GET_PC_OFFS());
- rPM0 = d;
+ elprintf(EL_SVP, "PM2 raw w %04x @ %04x", d, GET_PPC_OFFS());
+ rPM2 = d;
}
// 11
u32 d = pm_io(3, 0, 0);
if (d != (u32)-1) return d;
- elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PC_OFFS());
- return rPM0;
+ elprintf(EL_SVP, "XST raw r %04x @ %04x", rXST, GET_PPC_OFFS());
+ return rXST;
}
static void write_XST(u32 d)
u32 r = pm_io(3, 1, d);
if (r != (u32)-1) return;
- elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PC_OFFS());
- rPM0 = d;
+ elprintf(EL_SVP, "XST raw w %04x @ %04x", d, GET_PPC_OFFS());
+ rXST = d;
}
// 12
u32 d = pm_io(4, 0, 0);
if (d != (u32)-1) return d;
// can be removed?
- elprintf(EL_SVP, "PM4 raw r %04x @ %04x", rPM4, GET_PC_OFFS());
- return rPM0;
+ elprintf(EL_SVP, "PM4 raw r %04x @ %04x", rPM4, GET_PPC_OFFS());
+ return rPM4;
}
static void write_PM4(u32 d)
u32 r = pm_io(4, 1, d);
if (r != (u32)-1) return;
// can be removed?
- elprintf(EL_SVP, "PM4 raw w %04x @ %04x", d, GET_PC_OFFS());
- rPM0 = d;
+ elprintf(EL_SVP, "PM4 raw w %04x @ %04x", d, GET_PPC_OFFS());
+ rPM4 = d;
}
// 14
{
if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
if (ssp->emu_status & SSP_PMC_SET)
- elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PC_OFFS());
+ elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
ssp->emu_status |= SSP_PMC_SET;
+ ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
return rPMC.l;
} else {
ssp->emu_status |= SSP_PMC_HAVE_ADDR;
{
if (ssp->emu_status & SSP_PMC_HAVE_ADDR) {
if (ssp->emu_status & SSP_PMC_SET)
- elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PC_OFFS());
+ elprintf(EL_ANOMALY|EL_SVP, "prev PMC not used @ %04x", GET_PPC_OFFS());
ssp->emu_status |= SSP_PMC_SET;
+ ssp->emu_status &= ~SSP_PMC_HAVE_ADDR;
rPMC.l = d;
} else {
ssp->emu_status |= SSP_PMC_HAVE_ADDR;
static write_func_t write_handlers[16] =
{
write_unknown, write_unknown, write_unknown, write_unknown, // -, X, Y, A
- write_unknown, // 4 ST
+// write_unknown, // 4 ST
+ write_ST, // 4 ST (debug hook)
write_STACK,
write_PC,
write_unknown, // 7 P
write_AL
};
+// -----------------------------------------------------
+// pointer register handlers
+
+//
+#define ptr1_read(op) ptr1_read_(op&3,(op>>6)&4,(op<<1)&0x18)
+
+static u32 ptr1_read_(int ri, int isj2, int modi3)
+{
+ //int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
+ int t = ri | isj2 | modi3;
+ switch (t)
+ {
+ // mod=0 (00)
+ case 0x00:
+ case 0x01:
+ case 0x02: return ssp->RAM0[ssp->r0[t&3]];
+ case 0x03: return ssp->RAM0[0];
+ case 0x04:
+ case 0x05:
+ case 0x06: return ssp->RAM1[ssp->r1[t&3]];
+ case 0x07: return ssp->RAM1[0];
+ // mod=1 (01), "+!"
+ // mod=3, "+"
+ case 0x08:
+ case 0x18:
+ case 0x09:
+ case 0x19:
+ case 0x0a:
+ case 0x1a: return ssp->RAM0[ssp->r0[t&3]++];
+ case 0x0b: return ssp->RAM0[1];
+ case 0x0c:
+ case 0x1c:
+ case 0x0d:
+ case 0x1d:
+ case 0x0e:
+ case 0x1e: return ssp->RAM1[ssp->r1[t&3]++];
+ case 0x0f: return ssp->RAM1[1];
+ // mod=2 (10), "-"
+ case 0x10:
+ case 0x11:
+ case 0x12: return ssp->RAM0[ssp->r0[t&3]--];
+ case 0x13: return ssp->RAM0[2];
+ case 0x14:
+ case 0x15:
+ case 0x16: return ssp->RAM1[ssp->r1[t&3]--];
+ case 0x17: return ssp->RAM1[2];
+ // mod=3 (11)
+ case 0x1b: return ssp->RAM0[3];
+ case 0x1f: return ssp->RAM1[3];
+ }
+
+ return 0;
+}
+
+static void ptr1_write(int op, u32 d)
+{
+ int t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
+ switch (t)
+ {
+ // mod=0 (00)
+ case 0x00:
+ case 0x01:
+ case 0x02: ssp->RAM0[ssp->r0[t&3]] = d; return;
+ case 0x03: ssp->RAM0[0] = d; return;
+ case 0x04:
+ case 0x05:
+ case 0x06: ssp->RAM1[ssp->r1[t&3]] = d; return;
+ case 0x07: ssp->RAM1[0] = d; return;
+ // mod=1 (01), "+!"
+ // mod=3, "+"
+ case 0x08:
+ case 0x18:
+ case 0x09:
+ case 0x19:
+ case 0x0a:
+ case 0x1a: ssp->RAM0[ssp->r0[t&3]++] = d; return;
+ case 0x0b: ssp->RAM0[1] = d; return;
+ case 0x0c:
+ case 0x1c:
+ case 0x0d:
+ case 0x1d:
+ case 0x0e:
+ case 0x1e: ssp->RAM1[ssp->r1[t&3]++] = d; return;
+ case 0x0f: ssp->RAM1[1] = d; return;
+ // mod=2 (10), "-"
+ case 0x10:
+ case 0x11:
+ case 0x12: ssp->RAM0[ssp->r0[t&3]--] = d; return;
+ case 0x13: ssp->RAM0[2] = d; return;
+ case 0x14:
+ case 0x15:
+ case 0x16: ssp->RAM1[ssp->r1[t&3]--] = d; return;
+ case 0x17: ssp->RAM1[2] = d; return;
+ // mod=3 (11)
+ case 0x1b: ssp->RAM0[3] = d; return;
+ case 0x1f: ssp->RAM1[3] = d; return;
+ }
+}
+
+static u32 ptr2_read(int op)
+{
+ int mv = 0, t = (op&3) | ((op>>6)&4) | ((op<<1)&0x18);
+ switch (t)
+ {
+ // mod=0 (00)
+ case 0x00:
+ case 0x01:
+ case 0x02: mv = ssp->RAM0[ssp->r0[t&3]]++; break;
+ case 0x03: mv = ssp->RAM0[0]++; break;
+ case 0x04:
+ case 0x05:
+ case 0x06: mv = ssp->RAM1[ssp->r1[t&3]]++; break;
+ case 0x07: mv = ssp->RAM1[0]++; break;
+ // mod=1 (01)
+ case 0x0b: mv = ssp->RAM0[1]++; break;
+ case 0x0f: mv = ssp->RAM1[1]++; break;
+ // mod=2 (10)
+ case 0x13: mv = ssp->RAM0[2]++; break;
+ case 0x17: mv = ssp->RAM1[2]++; break;
+ // mod=3 (11)
+ case 0x1b: mv = ssp->RAM0[3]++; break;
+ case 0x1f: mv = ssp->RAM1[3]++; break;
+ default: elprintf(EL_SVP|EL_ANOMALY, "invalid mod in ((rX))? @ %04x", GET_PPC_OFFS());
+ return 0;
+ }
+
+ return ((unsigned short *)svp->iram_rom)[mv];
+}
+
+
+// -----------------------------------------------------
+
void ssp1601_reset(ssp1601_t *l_ssp)
{
ssp = l_ssp;
ssp->emu_status = 0;
ssp->gr[SSP_GR0].v = 0xffff0000;
rPC = 0x400;
- rSTACK = 6; // ? using descending stack
+ rSTACK = 0; // ? using ascending stack
}
-void ssp1601_run(int cycles)
+static void debug_dump(void)
{
- int op;
+ printf("GR0: %04x X: %04x Y: %04x A: %08x\n", ssp->gr[SSP_GR0].h, rX, rY, ssp->gr[SSP_A].v);
+ printf("PC: %04x (%04x) P: %08x\n", GET_PC(), GET_PC() << 1, ssp->gr[SSP_P].v);
+ printf("PM0: %04x PM1: %04x PM2: %04x\n", rPM0, rPM1, rPM2);
+ printf("XST: %04x PM4: %04x PMC: %08x\n", rXST, rPM4, ssp->gr[SSP_PMC].v);
+ printf(" ST: %04x %c%c%c%c, GP0_0 %i, GP0_1 %i\n", rST, rST&FLAG_N?'N':'n', rST&FLAG_V?'V':'v',
+ rST&FLAG_Z?'Z':'z', rST&FLAG_L?'L':'l', (rST>>5)&1, (rST>>6)&1);
+ printf("STACK: %i %04x %04x %04x %04x %04x %04x\n", rSTACK, ssp->stack[0], ssp->stack[1],
+ ssp->stack[2], ssp->stack[3], ssp->stack[4], ssp->stack[5]);
+ printf("r0-r2: %02x %02x %02x r4-r6: %02x %02x %02x\n", rIJ[0], rIJ[1], rIJ[2], rIJ[4], rIJ[5], rIJ[6]);
+ elprintf(EL_SVP, "cycles: %i, emu_status: %x", g_cycles, ssp->emu_status);
+}
+static void debug_dump_mem(void)
+{
+ int h, i;
+ printf("RAM0\n");
+ for (h = 0; h < 32; h++)
+ {
+ if (h == 16) printf("RAM1\n");
+ printf("%03x:", h*16);
+ for (i = 0; i < 16; i++)
+ printf(" %04x", ssp->RAM[h*16+i]);
+ printf("\n");
+ }
+}
+
+static int bpts[10] = { 0, };
+
+static void debug(unsigned int pc, unsigned int op)
+{
+ static char buffo[64] = {0,};
+ char buff[64] = {0,};
+ int i;
+
+ if (running) {
+ for (i = 0; i < 10; i++)
+ if (pc != 0 && bpts[i] == pc) {
+ printf("breakpoint %i\n", i);
+ running = 0;
+ break;
+ }
+ }
+ if (running) return;
+
+ printf("%04x (%02x) @ %04x\n", op, op >> 9, pc<<1);
+
+ while (1)
+ {
+ printf("dbg> ");
+ fflush(stdout);
+ fgets(buff, sizeof(buff), stdin);
+ if (buff[0] == '\n') strcpy(buff, buffo);
+ else strcpy(buffo, buff);
+
+ switch (buff[0]) {
+ case 0: exit(0);
+ case 'c':
+ case 'r': running = 1; return;
+ case 's':
+ case 'n': return;
+ case 'x': debug_dump(); break;
+ case 'm': debug_dump_mem(); break;
+ case 'b': {
+ char *baddr = buff + 2;
+ i = 0;
+ if (buff[3] == ' ') { i = buff[2] - '0'; baddr = buff + 4; }
+ bpts[i] = strtol(baddr, NULL, 16) >> 1;
+ printf("breakpoint %i set @ %04x\n", i, bpts[i]<<1);
+ break;
+ }
+ case 'd': {
+ FILE *f = fopen("dump.bin", "wb");
+ unsigned short *p = (unsigned short *)svp->iram_rom;
+ int i;
+ if (f) {
+ for (i = 0; i < 0x10000; i++) p[i] = (p[i]<<8) | (p[i]>>8);
+ fwrite(svp->iram_rom, 1, 0x20000, f);
+ fclose(f);
+ for (i = 0; i < 0x10000; i++) p[i] = (p[i]<<8) | (p[i]>>8);
+ printf("dumped to dump.bin\n");
+ }
+ else
+ printf("dump failed\n");
+ break;
+ }
+ default: printf("unknown command\n"); break;
+ }
+ }
+}
+
+void ssp1601_run(int cycles)
+{
SET_PC(rPC);
g_cycles = cycles;
+//running = 0;
while (g_cycles > 0)
{
- op = *PC;
+ int op;
+ u32 tmpv;
+
+ op = *PC++;
+ debug(GET_PC()-1, op);
switch (op >> 9)
{
// ld d, s
- case 0:
+ case 0x00:
if (op == 0) break; // nop
if (op == ((SSP_A<<4)|SSP_P)) { // A <- P
// not sure. MAME claims that only hi word is transfered.
read_P(); // update P
ssp->gr[SSP_A].v = ssp->gr[SSP_P].v;
- break;
}
+ else
{
- u32 d = REG_READ(op & 0x0f);
- REG_WRITE((op & 0xf0) >> 4, d);
+ tmpv = REG_READ(op & 0x0f);
+ REG_WRITE((op & 0xf0) >> 4, tmpv);
+ }
+ break;
+
+ // ld d, (ri)
+ case 0x01: tmpv = ptr1_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
+
+ // ld (ri), s
+ case 0x02: tmpv = REG_READ((op & 0xf0) >> 4); ptr1_write(op, tmpv); break;
+
+ // ldi d, imm
+ case 0x04: tmpv = *PC++; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
+
+ // ld d, ((ri))
+ case 0x05: tmpv = ptr2_read(op); REG_WRITE((op & 0xf0) >> 4, tmpv); break;
+
+ // ldi (ri), imm
+ case 0x06: tmpv = *PC++; ptr1_write(op, tmpv); break;
+
+ // ld adr, a
+ case 0x07: ssp->RAM[op & 0x1ff] = rA; break;
+
+ // ld d, ri
+ case 0x09: tmpv = rIJ[(op&3)|((op>>6)&4)]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
+
+ // ld ri, s
+ case 0x0a: rIJ[(op&3)|((op>>6)&4)] = REG_READ((op & 0xf0) >> 4); break;
+
+ // ldi ri, simm
+ case 0x0c:
+ case 0x0d:
+ case 0x0e:
+ case 0x0f: rIJ[(op>>8)&7] = op; break;
+
+ // call cond, addr
+ case 0x24: {
+ int cond = 0;
+ COND_CHECK
+ if (cond) { int new_PC = *PC++; write_STACK(GET_PC()); write_PC(new_PC); }
+ else PC++;
+ break;
+ }
+
+ // ld d, (a)
+ case 0x25: tmpv = ((unsigned short *)svp->iram_rom)[rA]; REG_WRITE((op & 0xf0) >> 4, tmpv); break;
+
+ // bra cond, addr
+ case 0x26: {
+ int cond = 0;
+ COND_CHECK
+ if (cond) { int new_PC = *PC++; write_PC(new_PC); }
+ else PC++;
+ break;
+ }
+
+ // mod cond, op
+ case 0x48: {
+ int cond = 0;
+ COND_CHECK
+ if (cond) {
+ switch (op & 7) {
+ case 2: rA32 >>= 1; break; // shr
+ case 3: rA32 <<= 1; break; // shl
+ case 6: rA32 = -(int)rA32; break; // neg
+ case 7: if ((int)rA32 < 0) rA32 = -(int)rA32; break; // abs
+ default: elprintf(EL_SVP, "ssp16: unhandled mod %i @ %04x", op&7, GET_PPC_OFFS());
+ }
+ UPD_ACC_ZN
}
- // flags?
break;
+ }
+
+ // mpya (rj), (ri), b
+ case 0x4b:
+ // dunno if this is correct. What about b?
+ read_P(); // update P
+ ssp->gr[SSP_A].v += ssp->gr[SSP_P].v; // maybe only upper word?
+ rX = ptr1_read_(op&3, 0, (op<<1)&0x18); // ri (maybe rj?)
+ rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); // rj
+ break;
+
+ // mld (rj), (ri), b
+ case 0x5b:
+ // dunno if this is correct. What about b?
+ ssp->gr[SSP_A].v = 0; // maybe only upper word?
+ rX = ptr1_read_(op&3, 0, (op<<1)&0x18); // ri (maybe rj?)
+ rY = ptr1_read_((op>>4)&3, 4, (op>>3)&0x18); // rj
+ break;
+
+ // OP a, s
+ case 0x10: tmpv = REG_READ(op & 0x0f); OP_SUBA(tmpv); break;
+ case 0x30: tmpv = REG_READ(op & 0x0f); OP_CMPA(tmpv); break;
+ case 0x40: tmpv = REG_READ(op & 0x0f); OP_ADDA(tmpv); break;
+ case 0x50: tmpv = REG_READ(op & 0x0f); OP_ANDA(tmpv); break;
+ case 0x60: tmpv = REG_READ(op & 0x0f); OP_ORA (tmpv); break;
+ case 0x70: tmpv = REG_READ(op & 0x0f); OP_EORA(tmpv); break;
+
+ // OP a, (ri)
+ case 0x11: tmpv = ptr1_read(op); OP_SUBA(tmpv); break;
+ case 0x31: tmpv = ptr1_read(op); OP_CMPA(tmpv); break;
+ case 0x41: tmpv = ptr1_read(op); OP_ADDA(tmpv); break;
+ case 0x51: tmpv = ptr1_read(op); OP_ANDA(tmpv); break;
+ case 0x61: tmpv = ptr1_read(op); OP_ORA (tmpv); break;
+ case 0x71: tmpv = ptr1_read(op); OP_EORA(tmpv); break;
+
+ // OP a, adr
+ case 0x03: tmpv = ssp->RAM[op & 0x1ff]; OP_LDA (tmpv); break;
+ case 0x13: tmpv = ssp->RAM[op & 0x1ff]; OP_SUBA(tmpv); break;
+ case 0x33: tmpv = ssp->RAM[op & 0x1ff]; OP_CMPA(tmpv); break;
+ case 0x43: tmpv = ssp->RAM[op & 0x1ff]; OP_ADDA(tmpv); break;
+ case 0x53: tmpv = ssp->RAM[op & 0x1ff]; OP_ANDA(tmpv); break;
+ case 0x63: tmpv = ssp->RAM[op & 0x1ff]; OP_ORA (tmpv); break;
+ case 0x73: tmpv = ssp->RAM[op & 0x1ff]; OP_EORA(tmpv); break;
+
+ // OP a, imm
+ case 0x14: tmpv = *PC++; OP_SUBA(tmpv); break;
+ case 0x34: tmpv = *PC++; OP_CMPA(tmpv); break;
+ case 0x44: tmpv = *PC++; OP_ADDA(tmpv); break;
+ case 0x54: tmpv = *PC++; OP_ANDA(tmpv); break;
+ case 0x64: tmpv = *PC++; OP_ORA (tmpv); break;
+ case 0x74: tmpv = *PC++; OP_EORA(tmpv); break;
+
+ // OP a, ((ri))
+ case 0x15: tmpv = ptr2_read(op); OP_SUBA(tmpv); break;
+ case 0x35: tmpv = ptr2_read(op); OP_CMPA(tmpv); break;
+ case 0x45: tmpv = ptr2_read(op); OP_ADDA(tmpv); break;
+ case 0x55: tmpv = ptr2_read(op); OP_ANDA(tmpv); break;
+ case 0x65: tmpv = ptr2_read(op); OP_ORA (tmpv); break;
+ case 0x75: tmpv = ptr2_read(op); OP_EORA(tmpv); break;
+
+ // OP a, ri
+ case 0x19: tmpv = rIJ[IJind]; OP_SUBA(tmpv); break;
+ case 0x39: tmpv = rIJ[IJind]; OP_CMPA(tmpv); break;
+ case 0x49: tmpv = rIJ[IJind]; OP_ADDA(tmpv); break;
+ case 0x59: tmpv = rIJ[IJind]; OP_ANDA(tmpv); break;
+ case 0x69: tmpv = rIJ[IJind]; OP_ORA (tmpv); break;
+ case 0x79: tmpv = rIJ[IJind]; OP_EORA(tmpv); break;
+
+ // OP simm
+ case 0x1c: OP_SUBA(op & 0xff); break;
+ case 0x3c: OP_CMPA(op & 0xff); break;
+ case 0x4c: OP_ADDA(op & 0xff); break;
+ // MAME code only does LSB of top word, but this looks wrong to me.
+ case 0x5c: OP_ANDA(op & 0xff); break;
+ case 0x6c: OP_ORA (op & 0xff); break;
+ case 0x7c: OP_EORA(op & 0xff); break;
default:
- elprintf(EL_ANOMALY|EL_SVP, "ssp16: unhandled op %04x @ %04x", op, GET_PC_OFFS());
+ elprintf(EL_ANOMALY|EL_SVP, "ssp16: unhandled op %04x @ %04x", op, GET_PPC_OFFS());
break;
}
g_cycles--;
- PC++;
}
read_P(); // update P
notaz.gp2x.de / picodrive.git / blobdiff