/*
- * note about silly things like emith_or_r_r_r_lsl:
+ * note about silly things like emith_eor_r_r_r:
* these are here because the compiler was designed
* for ARM as it's primary target.
*/
#define CONTEXT_REG xBP
+#define IOP_JMP 0xeb
#define IOP_JO 0x70
#define IOP_JNO 0x71
#define IOP_JB 0x72
#define EMIT_MODRM(mod,r,rm) \
EMIT(((mod)<<6) | ((r)<<3) | (rm), u8)
+#define EMIT_SIB(scale,index,base) \
+ EMIT(((scale)<<6) | ((index)<<3) | (base), u8)
+
#define EMIT_OP_MODRM(op,mod,r,rm) { \
EMIT_OP(op); \
EMIT_MODRM(mod, r, rm); \
} \
}
-#define emith_or_r_r_r_lsl(d, s1, s2, lslimm) { \
+// _r_r_shift
+#define emith_or_r_r_lsl(d, s, lslimm) { \
int tmp_ = rcache_get_tmp(); \
- emith_lsl(tmp_, s2, lslimm); \
- emith_or_r_r(tmp_, s1); \
- emith_move_r_r(d, tmp_); \
+ emith_lsl(tmp_, s, lslimm); \
+ emith_or_r_r(d, tmp_); \
rcache_free_tmp(tmp_); \
}
+// d != s
+#define emith_eor_r_r_lsr(d, s, lsrimm) { \
+ emith_push(s); \
+ emith_lsr(s, s, lsrimm); \
+ emith_eor_r_r(d, s); \
+ emith_pop(s); \
+}
+
// _r_imm
#define emith_move_r_imm(r, imm) { \
EMIT_OP(0xb8 + (r)); \
emith_or_r_imm(r, imm); \
}
+#define emith_eor_r_imm_c(cond, r, imm) { \
+ (void)(cond); \
+ emith_eor_r_imm(r, imm); \
+}
+
#define emith_sub_r_imm_c(cond, r, imm) { \
(void)(cond); \
emith_sub_r_imm(r, imm); \
emith_and_r_imm(d, t); \
}
+#define emith_clear_msb_c(cond, d, s, count) { \
+ (void)(cond); \
+ emith_clear_msb(d, s, count); \
+}
+
#define emith_sext(d, s, bits) { \
emith_lsl(d, s, 32 - (bits)); \
emith_asr(d, d, 32 - (bits)); \
}
+#define emith_setc(r) { \
+ EMIT_OP(0x0f); \
+ EMIT(0x92, u8); \
+ EMIT_MODRM(3, 0, r); /* SETC r */ \
+}
+
// put bit0 of r0 to carry
#define emith_set_carry(r0) { \
emith_tst_r_imm(r0, 1); /* clears C */ \
#define emith_mul(d, s1, s2) \
emith_mul_(4, d, -1, s1, s2)
+// (dlo,dhi) += signed(s1) * signed(s2)
+#define emith_mula_s64(dlo, dhi, s1, s2) { \
+ emith_push(dhi); \
+ emith_push(dlo); \
+ emith_mul_(5, dlo, dhi, s1, s2); \
+ EMIT_OP_MODRM(0x03, 0, dlo, 4); \
+ EMIT_SIB(0, 4, 4); /* add dlo, [esp] */ \
+ EMIT_OP_MODRM(0x13, 1, dhi, 4); \
+ EMIT_SIB(0, 4, 4); \
+ EMIT(4, u8); /* adc dhi, [esp+4] */ \
+ emith_add_r_imm(xSP, 4*2); \
+}
+
// "flag" instructions are the same
#define emith_subf_r_imm emith_sub_r_imm
#define emith_addf_r_r emith_add_r_r
EMIT(disp, u32); \
}
+#define emith_call_cond(cond, ptr) \
+ emith_call(ptr)
+
// "simple" or "short" jump
#define EMITH_SJMP_START(cond) { \
u8 *cond_ptr; \
#define emith_carry_to_t(srr, is_sub) { \
int tmp_ = rcache_get_tmp(); \
- EMIT_OP(0x0f); \
- EMIT(0x92, u8); \
- EMIT_MODRM(3, 0, tmp_); /* SETC */ \
+ emith_setc(tmp_); \
emith_bic_r_imm(srr, 1); \
EMIT_OP_MODRM(0x08, 3, tmp_, srr); /* OR srrl, tmpl */ \
rcache_free_tmp(tmp_); \
}
+/*
+ * if Q
+ * t = carry(Rn += Rm)
+ * else
+ * t = carry(Rn -= Rm)
+ * T ^= t
+ */
+#define emith_sh2_div1_step(rn, rm, sr) { \
+ u8 *jmp0, *jmp1; \
+ int tmp_ = rcache_get_tmp(); \
+ emith_tst_r_imm(sr, Q); /* if (Q ^ M) */ \
+ JMP8_POS(jmp0); /* je do_sub */ \
+ emith_add_r_r(rn, rm); \
+ JMP8_POS(jmp1); /* jmp done */ \
+ JMP8_EMIT(IOP_JE, jmp0); /* do_sub: */ \
+ emith_sub_r_r(rn, rm); \
+ JMP8_EMIT(IOP_JMP, jmp1);/* done: */ \
+ emith_setc(tmp_); \
+ EMIT_OP_MODRM(0x30, 3, tmp_, sr); /* T = Q1 ^ Q2 (byte) */ \
+ rcache_free_tmp(tmp_); \
+}
+