X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2Fsh2%2Fmame%2Fsh2pico.c;h=174d469125068bcdd9c1eebbc91166459c535793;hb=6a5b1b362ecf78ce2925068a5d938d319ff583a3;hp=37ade45fec51828e9972587b1ba6e7a3c9673f09;hpb=405dfdd77f6500f040001196d34d2d00916662d3;p=picodrive.git

diff --git a/cpu/sh2/mame/sh2pico.c b/cpu/sh2/mame/sh2pico.c
index 37ade45..174d469 100644
--- a/cpu/sh2/mame/sh2pico.c
+++ b/cpu/sh2/mame/sh2pico.c
@@ -17,12 +17,46 @@ typedef unsigned short UINT16;
 typedef unsigned char  UINT8;
 #endif
 
-#define RB(sh2, a) p32x_sh2_read8(a,sh2)
-#define RW(sh2, a) p32x_sh2_read16(a,sh2)
-#define RL(sh2, a) p32x_sh2_read32(a,sh2)
-#define WB(sh2, a, d) p32x_sh2_write8(a,d,sh2)
-#define WW(sh2, a, d) p32x_sh2_write16(a,d,sh2)
-#define WL(sh2, a, d) p32x_sh2_write32(a,d,sh2)
+#ifdef DRC_SH2
+
+// this nasty conversion is needed for drc-expecting memhandlers
+#define MAKE_READFUNC(name, cname) \
+static inline unsigned int name(SH2 *sh2, unsigned int a) \
+{ \
+	unsigned int ret; \
+	sh2->sr |= sh2->icount << 12; \
+	ret = cname(a, sh2); \
+	sh2->icount = (signed int)sh2->sr >> 12; \
+	sh2->sr &= 0x3f3; \
+	return ret; \
+}
+
+#define MAKE_WRITEFUNC(name, cname) \
+static inline void name(SH2 *sh2, unsigned int a, unsigned int d) \
+{ \
+	sh2->sr |= sh2->icount << 12; \
+	cname(a, d, sh2); \
+	sh2->icount = (signed int)sh2->sr >> 12; \
+	sh2->sr &= 0x3f3; \
+}
+
+MAKE_READFUNC(RB, p32x_sh2_read8)
+MAKE_READFUNC(RW, p32x_sh2_read16)
+MAKE_READFUNC(RL, p32x_sh2_read32)
+MAKE_WRITEFUNC(WB, p32x_sh2_write8)
+MAKE_WRITEFUNC(WW, p32x_sh2_write16)
+MAKE_WRITEFUNC(WL, p32x_sh2_write32)
+
+#else
+
+#define RB(sh2, a) p32x_sh2_read8(a, sh2)
+#define RW(sh2, a) p32x_sh2_read16(a, sh2)
+#define RL(sh2, a) p32x_sh2_read32(a, sh2)
+#define WB(sh2, a, d) p32x_sh2_write8(a, d, sh2)
+#define WW(sh2, a, d) p32x_sh2_write16(a, d, sh2)
+#define WL(sh2, a, d) p32x_sh2_write32(a, d, sh2)
+
+#endif
 
 // some stuff from sh2comn.h
 #define T	0x00000001
@@ -71,14 +105,13 @@ static unsigned int op_refs[0x10000];
 
 #include "sh2.c"
 
-#ifndef DRC_SH2
 #ifndef DRC_CMP
 
-int sh2_execute(SH2 *sh2, int cycles)
+int sh2_execute_interpreter(SH2 *sh2, int cycles)
 {
 	UINT32 opcode;
 
-	sh2->icount = sh2->cycles_timeslice = cycles;
+	sh2->icount = cycles;
 
 	if (sh2->icount <= 0)
 		goto out;
@@ -89,6 +122,18 @@ int sh2_execute(SH2 *sh2, int cycles)
 		{
 			sh2->ppc = sh2->delay;
 			opcode = RW(sh2, sh2->delay);
+
+			// TODO: more branch types
+			if ((opcode >> 13) == 5) { // BRA/BSR
+				sh2->r[15] -= 4;
+				WL(sh2, sh2->r[15], sh2->sr);
+				sh2->r[15] -= 4;
+				WL(sh2, sh2->r[15], sh2->pc);
+				sh2->pc = RL(sh2, sh2->vbr + 6 * 4);
+				sh2->icount -= 5;
+				opcode = 9; // NOP
+			}
+
 			sh2->pc -= 2;
 		}
 		else
@@ -134,12 +179,12 @@ int sh2_execute(SH2 *sh2, int cycles)
 	while (sh2->icount > 0 || sh2->delay);	/* can't interrupt before delay */
 
 out:
-	return sh2->cycles_timeslice - sh2->icount;
+	return sh2->icount;
 }
 
 #else // if DRC_CMP
 
-int sh2_execute(SH2 *sh2, int cycles)
+int sh2_execute_interpreter(SH2 *sh2, int cycles)
 {
 	static unsigned int base_pc_[2] = { 0, 0 };
 	static unsigned int end_pc_[2] = { 0, 0 };
@@ -233,11 +278,10 @@ int sh2_execute(SH2 *sh2, int cycles)
 	while (1);
 
 out:
-	return sh2->cycles_timeslice - sh2->icount;
+	return sh2->icount;
 }
 
 #endif // DRC_CMP
-#endif // DRC_SH2
 
 #ifdef SH2_STATS
 #include <stdio.h>