X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=cpu%2Fdrc%2Femit_x86.c;h=e94e685b3bbfc7f9f8e3a28dfa691fd7c64ad803;hb=80599a42dbc06f3e86a09dae9dc98dccbb84b48c;hp=71b9a4037ce5a8b0dfca69bd53e28e2aad787aa0;hpb=c18edb34e6708b399c6bfee8dac7b21a62988643;p=picodrive.git

diff --git a/cpu/drc/emit_x86.c b/cpu/drc/emit_x86.c
index 71b9a40..e94e685 100644
--- a/cpu/drc/emit_x86.c
+++ b/cpu/drc/emit_x86.c
@@ -4,6 +4,20 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 
 #define CONTEXT_REG xBP
 
+#define IOP_JE  0x74
+#define IOP_JNE 0x75
+#define IOP_JBE 0x76
+#define IOP_JA  0x77
+#define IOP_JS  0x78
+#define IOP_JNS 0x79
+#define IOP_JLE 0x7e
+
+// unified conditions (we just use rel8 jump instructions for x86)
+#define DCOND_EQ IOP_JE
+#define DCOND_NE IOP_JNE
+#define DCOND_MI IOP_JS      // MInus
+#define DCOND_PL IOP_JNS     // PLus or zero
+
 #define EMIT_PTR(ptr, val, type) \
 	*(type *)(ptr) = val
 
@@ -25,24 +39,148 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 	EMIT_MODRM(mod, r, rm); \
 }
 
+#define JMP8_POS(ptr) \
+	ptr = tcache_ptr; \
+	tcache_ptr += 2
+
+#define JMP8_EMIT(op, ptr) \
+	EMIT_PTR(ptr, op, u8); \
+	EMIT_PTR(ptr + 1, (tcache_ptr - (ptr+2)), u8)
+
 #define emith_move_r_r(dst, src) \
 	EMIT_OP_MODRM(0x8b, 3, dst, src)
 
+#define emith_add_r_r(d, s) \
+	EMIT_OP_MODRM(0x01, 3, s, d)
+
+#define emith_sub_r_r(d, s) \
+	EMIT_OP_MODRM(0x29, 3, s, d)
+
+#define emith_or_r_r(d, s) \
+	EMIT_OP_MODRM(0x09, 3, s, d)
+
+#define emith_eor_r_r(d, s) \
+	EMIT_OP_MODRM(0x31, 3, s, d)
+
+// fake teq - test equivalence - get_flags(d ^ s)
+#define emith_teq_r_r(d, s) { \
+	emith_push(d); \
+	emith_eor_r_r(d, s); \
+	emith_pop(d); \
+}
+
+// _r_imm
 #define emith_move_r_imm(r, imm) { \
 	EMIT_OP(0xb8 + (r)); \
 	EMIT(imm, u32); \
 }
 
-#define emith_add_r_imm(r, imm) { \
-	EMIT_OP_MODRM(0x81, 3, 0, r); \
+#define emith_arith_r_imm(op, r, imm) { \
+	EMIT_OP_MODRM(0x81, 3, op, r); \
 	EMIT(imm, u32); \
 }
 
-#define emith_sub_r_imm(r, imm) { \
-	EMIT_OP_MODRM(0x81, 3, 5, r); \
+// 2 - adc, 3 - sbb, 6 - xor, 7 - cmp
+#define emith_add_r_imm(r, imm) \
+	emith_arith_r_imm(0, r, imm)
+
+#define emith_or_r_imm(r, imm) \
+	emith_arith_r_imm(1, r, imm)
+
+#define emith_and_r_imm(r, imm) \
+	emith_arith_r_imm(4, r, imm)
+
+#define emith_sub_r_imm(r, imm) \
+	emith_arith_r_imm(5, r, imm)
+
+#define emith_tst_r_imm(r, imm) { \
+	EMIT_OP_MODRM(0xf7, 3, 0, r); \
 	EMIT(imm, u32); \
 }
 
+// fake
+#define emith_bic_r_imm(r, imm) \
+	emith_arith_r_imm(4, r, ~(imm))
+
+// fake conditionals (using SJMP instead)
+#define emith_add_r_imm_c(cond, r, imm) { \
+	(void)(cond); \
+	emith_arith_r_imm(0, r, imm); \
+}
+
+#define emith_or_r_imm_c(cond, r, imm) { \
+	(void)(cond); \
+	emith_arith_r_imm(1, r, imm); \
+}
+
+#define emith_sub_r_imm_c(cond, r, imm) { \
+	(void)(cond); \
+	emith_arith_r_imm(5, r, imm); \
+}
+
+// shift
+#define emith_shift(op, d, s, cnt) { \
+	if (d != s) \
+		emith_move_r_r(d, s); \
+	EMIT_OP_MODRM(0xc1, 3, op, d); \
+	EMIT(cnt, u8); \
+}
+
+#define emith_asr(d, s, cnt) \
+	emith_shift(7, d, s, cnt)
+
+#define emith_lsl(d, s, cnt) \
+	emith_shift(4, d, s, cnt)
+
+// misc
+#define emith_push(r) \
+	EMIT_OP(0x50 + (r))
+
+#define emith_pop(r) \
+	EMIT_OP(0x58 + (r))
+
+#define emith_neg_r(r) \
+	EMIT_OP_MODRM(0xf7, 3, 3, r)
+
+#define emith_clear_msb(d, s, count) { \
+	u32 t = (u32)-1; \
+	t >>= count; \
+	if (d != s) \
+		emith_move_r_r(d, s); \
+	emith_and_r_imm(d, t); \
+}
+
+#define emith_sext(d, s, bits) { \
+	emith_lsl(d, s, 32 - (bits)); \
+	emith_asr(d, d, 32 - (bits)); \
+}
+
+// XXX: stupid mess
+#define emith_mul(d, s1, s2) { \
+	int rmr; \
+	if (d != xAX) \
+		emith_push(xAX); \
+	if ((s1) == xAX) \
+		rmr = s2; \
+	else if ((s2) == xAX) \
+		rmr = s1; \
+	else { \
+		emith_move_r_r(xAX, s1); \
+		rmr = s2; \
+	} \
+	emith_push(xDX); \
+	EMIT_OP_MODRM(0xf7, 3, 4, rmr); /* MUL rmr */ \
+	emith_pop(xDX); \
+	if (d != xAX) { \
+		emith_move_r_r(d, xAX); \
+		emith_pop(xAX); \
+	} \
+}
+
+// "flag" instructions are the same
+#define emith_subf_r_imm emith_sub_r_imm
+#define emith_subf_r_r   emith_sub_r_r
+
 // XXX: offs is 8bit only
 #define emith_ctx_read(r, offs) { \
 	EMIT_OP_MODRM(0x8b, 1, r, xBP); \
@@ -66,15 +204,16 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 	EMIT(disp, u32); \
 }
 
-#define EMITH_CONDITIONAL(code, is_nonzero) { \
-	u8 *ptr = tcache_ptr; \
-	tcache_ptr = tcache_ptr + 2; \
-	code; \
-	EMIT_PTR(ptr, ((is_nonzero) ? 0x75 : 0x74), u8); \
-	EMIT_PTR(ptr + 1, (tcache_ptr - (ptr + 2)), u8); \
+// "simple" or "short" jump
+#define EMITH_SJMP_START(cond) { \
+	u8 *cond_ptr; \
+	JMP8_POS(cond_ptr)
+
+#define EMITH_SJMP_END(cond) \
+	JMP8_EMIT(cond, cond_ptr); \
 }
 
-#define arg2reg(rd, arg) \
+#define host_arg2reg(rd, arg) \
 	switch (arg) { \
 	case 0: rd = xAX; break; \
 	case 1: rd = xDX; break; \
@@ -83,25 +222,46 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 
 #define emith_pass_arg_r(arg, reg) { \
 	int rd = 7; \
-	arg2reg(rd, arg); \
+	host_arg2reg(rd, arg); \
 	emith_move_r_r(rd, reg); \
 }
 
 #define emith_pass_arg_imm(arg, imm) { \
 	int rd = 7; \
-	arg2reg(rd, arg); \
+	host_arg2reg(rd, arg); \
 	emith_move_r_imm(rd, imm); \
 }
 
 /* SH2 drc specific */
-#define emith_test_t() { \
-	if (reg_map_g2h[SHR_SR] == -1) { \
-		EMIT_OP_MODRM(0xf6, 1, 0, 5); \
-		EMIT(SHR_SR * 4, u8); \
-		EMIT(0x01, u8); /* test [ebp+SHR_SR], byte 1 */ \
-	} else { \
-		EMIT_OP_MODRM(0xf7, 3, 0, reg_map_g2h[SHR_SR]); \
-		EMIT(0x01, u16); /* test <reg>, word 1 */ \
-	} \
+#define emith_sh2_test_t() { \
+	int t = rcache_get_reg(SHR_SR, RC_GR_READ); \
+	EMIT_OP_MODRM(0xf6, 3, 0, t); \
+	EMIT(0x01, u8); /* test <reg>, byte 1 */ \
+}
+
+#define emith_sh2_dtbf_loop() { \
+	u8 *jmp0; /* negative cycles check */            \
+	u8 *jmp1; /* unsinged overflow check */          \
+	int cr, rn;                                      \
+	tmp = rcache_get_tmp();                          \
+	cr = rcache_get_reg(SHR_SR, RC_GR_RMW);          \
+	rn = rcache_get_reg((op >> 8) & 0x0f, RC_GR_RMW);\
+	emith_sub_r_imm(rn, 1);                          \
+	emith_sub_r_imm(cr, (cycles+1) << 12);           \
+	cycles = 0;                                      \
+	emith_asr(tmp, cr, 2+12);                        \
+	JMP8_POS(jmp0); /* no negative cycles */         \
+	emith_move_r_imm(tmp, 0);                        \
+	JMP8_EMIT(IOP_JNS, jmp0);                        \
+	emith_and_r_imm(cr, 0xffe);                      \
+	emith_subf_r_r(rn, tmp);                         \
+	JMP8_POS(jmp1); /* no overflow */                \
+	emith_neg_r(rn); /* count left */                \
+	emith_lsl(rn, rn, 2+12);                         \
+	emith_or_r_r(cr, rn);                            \
+	emith_or_r_imm(cr, 1);                           \
+	emith_move_r_imm(rn, 0);                         \
+	JMP8_EMIT(IOP_JA, jmp1);                         \
+	rcache_free_tmp(tmp);                            \
 }