cpu/drc/emit_arm.c

   1 /*
   2  * Basic macros to emit ARM instructions and some utils
   3  * Copyright (C) 2008,2009,2010 notaz
   4  *
   5  * This work is licensed under the terms of MAME license.
   6  * See COPYING file in the top-level directory.
   7  */
   8 #define CONTEXT_REG 11
   9 #define RET_REG     0
  10
  11 // XXX: tcache_ptr type for SVP and SH2 compilers differs..
  12 #define EMIT_PTR(ptr, x) \
  13         do { \
  14                 *(u32 *)ptr = x; \
  15                 ptr = (void *)((u8 *)ptr + sizeof(u32)); \
  16                 COUNT_OP; \
  17         } while (0)
  18
  19 #define EMIT(x) EMIT_PTR(tcache_ptr, x)
  20
  21 #define A_R4M  (1 << 4)
  22 #define A_R5M  (1 << 5)
  23 #define A_R6M  (1 << 6)
  24 #define A_R7M  (1 << 7)
  25 #define A_R8M  (1 << 8)
  26 #define A_R9M  (1 << 9)
  27 #define A_R10M (1 << 10)
  28 #define A_R11M (1 << 11)
  29 #define A_R12M (1 << 12)
  30 #define A_R14M (1 << 14)
  31 #define A_R15M (1 << 15)
  32
  33 #define A_COND_AL 0xe
  34 #define A_COND_EQ 0x0
  35 #define A_COND_NE 0x1
  36 #define A_COND_HS 0x2
  37 #define A_COND_LO 0x3
  38 #define A_COND_MI 0x4
  39 #define A_COND_PL 0x5
  40 #define A_COND_VS 0x6
  41 #define A_COND_VC 0x7
  42 #define A_COND_HI 0x8
  43 #define A_COND_LS 0x9
  44 #define A_COND_GE 0xa
  45 #define A_COND_LT 0xb
  46 #define A_COND_GT 0xc
  47 #define A_COND_LE 0xd
  48 #define A_COND_CS A_COND_HS
  49 #define A_COND_CC A_COND_LO
  50
  51 /* unified conditions */
  52 #define DCOND_EQ A_COND_EQ
  53 #define DCOND_NE A_COND_NE
  54 #define DCOND_MI A_COND_MI
  55 #define DCOND_PL A_COND_PL
  56 #define DCOND_HI A_COND_HI
  57 #define DCOND_HS A_COND_HS
  58 #define DCOND_LO A_COND_LO
  59 #define DCOND_GE A_COND_GE
  60 #define DCOND_GT A_COND_GT
  61 #define DCOND_LT A_COND_LT
  62 #define DCOND_LS A_COND_LS
  63 #define DCOND_LE A_COND_LE
  64 #define DCOND_VS A_COND_VS
  65 #define DCOND_VC A_COND_VC
  66
  67 /* addressing mode 1 */
  68 #define A_AM1_LSL 0
  69 #define A_AM1_LSR 1
  70 #define A_AM1_ASR 2
  71 #define A_AM1_ROR 3
  72
  73 #define A_AM1_IMM(ror2,imm8)                  (((ror2)<<8) | (imm8) | 0x02000000)
  74 #define A_AM1_REG_XIMM(shift_imm,shift_op,rm) (((shift_imm)<<7) | ((shift_op)<<5) | (rm))
  75 #define A_AM1_REG_XREG(rs,shift_op,rm)        (((rs)<<8) | ((shift_op)<<5) | 0x10 | (rm))
  76
  77 /* data processing op */
  78 #define A_OP_AND 0x0
  79 #define A_OP_EOR 0x1
  80 #define A_OP_SUB 0x2
  81 #define A_OP_RSB 0x3
  82 #define A_OP_ADD 0x4
  83 #define A_OP_ADC 0x5
  84 #define A_OP_SBC 0x6
  85 #define A_OP_RSC 0x7
  86 #define A_OP_TST 0x8
  87 #define A_OP_TEQ 0x9
  88 #define A_OP_CMP 0xa
  89 #define A_OP_CMN 0xa
  90 #define A_OP_ORR 0xc
  91 #define A_OP_MOV 0xd
  92 #define A_OP_BIC 0xe
  93 #define A_OP_MVN 0xf
  94
  95 #define EOP_C_DOP_X(cond,op,s,rn,rd,shifter_op) \
  96         EMIT(((cond)<<28) | ((op)<< 21) | ((s)<<20) | ((rn)<<16) | ((rd)<<12) | (shifter_op))
  97
  98 #define EOP_C_DOP_IMM(     cond,op,s,rn,rd,ror2,imm8)             EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_IMM(ror2,imm8))
  99 #define EOP_C_DOP_REG_XIMM(cond,op,s,rn,rd,shift_imm,shift_op,rm) EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_REG_XIMM(shift_imm,shift_op,rm))
 100 #define EOP_C_DOP_REG_XREG(cond,op,s,rn,rd,rs,       shift_op,rm) EOP_C_DOP_X(cond,op,s,rn,rd,A_AM1_REG_XREG(rs,       shift_op,rm))
 101
 102 #define EOP_MOV_IMM(rd,   ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_MOV,0, 0,rd,ror2,imm8)
 103 #define EOP_MVN_IMM(rd,   ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_MVN,0, 0,rd,ror2,imm8)
 104 #define EOP_ORR_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_ORR,0,rn,rd,ror2,imm8)
 105 #define EOP_EOR_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_EOR,0,rn,rd,ror2,imm8)
 106 #define EOP_ADD_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_ADD,0,rn,rd,ror2,imm8)
 107 #define EOP_BIC_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_BIC,0,rn,rd,ror2,imm8)
 108 #define EOP_AND_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_AND,0,rn,rd,ror2,imm8)
 109 #define EOP_SUB_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_SUB,0,rn,rd,ror2,imm8)
 110 #define EOP_TST_IMM(   rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_TST,1,rn, 0,ror2,imm8)
 111 #define EOP_CMP_IMM(   rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_CMP,1,rn, 0,ror2,imm8)
 112 #define EOP_RSB_IMM(rd,rn,ror2,imm8) EOP_C_DOP_IMM(A_COND_AL,A_OP_RSB,0,rn,rd,ror2,imm8)
 113
 114 #define EOP_MOV_IMM_C(cond,rd,   ror2,imm8) EOP_C_DOP_IMM(cond,A_OP_MOV,0, 0,rd,ror2,imm8)
 115 #define EOP_ORR_IMM_C(cond,rd,rn,ror2,imm8) EOP_C_DOP_IMM(cond,A_OP_ORR,0,rn,rd,ror2,imm8)
 116 #define EOP_RSB_IMM_C(cond,rd,rn,ror2,imm8) EOP_C_DOP_IMM(cond,A_OP_RSB,0,rn,rd,ror2,imm8)
 117
 118 #define EOP_MOV_REG(cond,s,rd,   rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_MOV,s, 0,rd,shift_imm,shift_op,rm)
 119 #define EOP_MVN_REG(cond,s,rd,   rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_MVN,s, 0,rd,shift_imm,shift_op,rm)
 120 #define EOP_ORR_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_ORR,s,rn,rd,shift_imm,shift_op,rm)
 121 #define EOP_ADD_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_ADD,s,rn,rd,shift_imm,shift_op,rm)
 122 #define EOP_ADC_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_ADC,s,rn,rd,shift_imm,shift_op,rm)
 123 #define EOP_SUB_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_SUB,s,rn,rd,shift_imm,shift_op,rm)
 124 #define EOP_SBC_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_SBC,s,rn,rd,shift_imm,shift_op,rm)
 125 #define EOP_AND_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_AND,s,rn,rd,shift_imm,shift_op,rm)
 126 #define EOP_EOR_REG(cond,s,rd,rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_EOR,s,rn,rd,shift_imm,shift_op,rm)
 127 #define EOP_CMP_REG(cond,     rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_CMP,1,rn, 0,shift_imm,shift_op,rm)
 128 #define EOP_TST_REG(cond,     rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_TST,1,rn, 0,shift_imm,shift_op,rm)
 129 #define EOP_TEQ_REG(cond,     rn,rm,shift_op,shift_imm) EOP_C_DOP_REG_XIMM(cond,A_OP_TEQ,1,rn, 0,shift_imm,shift_op,rm)
 130
 131 #define EOP_MOV_REG2(s,rd,   rm,shift_op,rs) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_MOV,s, 0,rd,rs,shift_op,rm)
 132 #define EOP_ADD_REG2(s,rd,rn,rm,shift_op,rs) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_ADD,s,rn,rd,rs,shift_op,rm)
 133 #define EOP_SUB_REG2(s,rd,rn,rm,shift_op,rs) EOP_C_DOP_REG_XREG(A_COND_AL,A_OP_SUB,s,rn,rd,rs,shift_op,rm)
 134
 135 #define EOP_MOV_REG_SIMPLE(rd,rm)           EOP_MOV_REG(A_COND_AL,0,rd,rm,A_AM1_LSL,0)
 136 #define EOP_MOV_REG_LSL(rd,   rm,shift_imm) EOP_MOV_REG(A_COND_AL,0,rd,rm,A_AM1_LSL,shift_imm)
 137 #define EOP_MOV_REG_LSR(rd,   rm,shift_imm) EOP_MOV_REG(A_COND_AL,0,rd,rm,A_AM1_LSR,shift_imm)
 138 #define EOP_MOV_REG_ASR(rd,   rm,shift_imm) EOP_MOV_REG(A_COND_AL,0,rd,rm,A_AM1_ASR,shift_imm)
 139 #define EOP_MOV_REG_ROR(rd,   rm,shift_imm) EOP_MOV_REG(A_COND_AL,0,rd,rm,A_AM1_ROR,shift_imm)
 140
 141 #define EOP_ORR_REG_SIMPLE(rd,rm)           EOP_ORR_REG(A_COND_AL,0,rd,rd,rm,A_AM1_LSL,0)
 142 #define EOP_ORR_REG_LSL(rd,rn,rm,shift_imm) EOP_ORR_REG(A_COND_AL,0,rd,rn,rm,A_AM1_LSL,shift_imm)
 143 #define EOP_ORR_REG_LSR(rd,rn,rm,shift_imm) EOP_ORR_REG(A_COND_AL,0,rd,rn,rm,A_AM1_LSR,shift_imm)
 144 #define EOP_ORR_REG_ASR(rd,rn,rm,shift_imm) EOP_ORR_REG(A_COND_AL,0,rd,rn,rm,A_AM1_ASR,shift_imm)
 145 #define EOP_ORR_REG_ROR(rd,rn,rm,shift_imm) EOP_ORR_REG(A_COND_AL,0,rd,rn,rm,A_AM1_ROR,shift_imm)
 146
 147 #define EOP_ADD_REG_SIMPLE(rd,rm)           EOP_ADD_REG(A_COND_AL,0,rd,rd,rm,A_AM1_LSL,0)
 148 #define EOP_ADD_REG_LSL(rd,rn,rm,shift_imm) EOP_ADD_REG(A_COND_AL,0,rd,rn,rm,A_AM1_LSL,shift_imm)
 149 #define EOP_ADD_REG_LSR(rd,rn,rm,shift_imm) EOP_ADD_REG(A_COND_AL,0,rd,rn,rm,A_AM1_LSR,shift_imm)
 150
 151 #define EOP_TST_REG_SIMPLE(rn,rm)           EOP_TST_REG(A_COND_AL,  rn,   0,A_AM1_LSL,rm)
 152
 153 #define EOP_MOV_REG2_LSL(rd,   rm,rs)       EOP_MOV_REG2(0,rd,   rm,A_AM1_LSL,rs)
 154 #define EOP_MOV_REG2_ROR(rd,   rm,rs)       EOP_MOV_REG2(0,rd,   rm,A_AM1_ROR,rs)
 155 #define EOP_ADD_REG2_LSL(rd,rn,rm,rs)       EOP_ADD_REG2(0,rd,rn,rm,A_AM1_LSL,rs)
 156 #define EOP_SUB_REG2_LSL(rd,rn,rm,rs)       EOP_SUB_REG2(0,rd,rn,rm,A_AM1_LSL,rs)
 157
 158 /* addressing mode 2 */
 159 #define EOP_C_AM2_IMM(cond,u,b,l,rn,rd,offset_12) \
 160         EMIT(((cond)<<28) | 0x05000000 | ((u)<<23) | ((b)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | (offset_12))
 161
 162 #define EOP_C_AM2_REG(cond,u,b,l,rn,rd,shift_imm,shift_op,rm) \
 163         EMIT(((cond)<<28) | 0x07000000 | ((u)<<23) | ((b)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | \
 164                 ((shift_imm)<<7) | ((shift_op)<<5) | (rm))
 165
 166 /* addressing mode 3 */
 167 #define EOP_C_AM3(cond,u,r,l,rn,rd,s,h,immed_reg) \
 168         EMIT(((cond)<<28) | 0x01000090 | ((u)<<23) | ((r)<<22) | ((l)<<20) | ((rn)<<16) | ((rd)<<12) | \
 169                         ((s)<<6) | ((h)<<5) | (immed_reg))
 170
 171 #define EOP_C_AM3_IMM(cond,u,l,rn,rd,s,h,offset_8) EOP_C_AM3(cond,u,1,l,rn,rd,s,h,(((offset_8)&0xf0)<<4)|((offset_8)&0xf))
 172
 173 #define EOP_C_AM3_REG(cond,u,l,rn,rd,s,h,rm)       EOP_C_AM3(cond,u,0,l,rn,rd,s,h,rm)
 174
 175 /* ldr and str */
 176 #define EOP_LDR_IMM2(cond,rd,rn,offset_12)  EOP_C_AM2_IMM(cond,1,0,1,rn,rd,offset_12)
 177 #define EOP_LDRB_IMM2(cond,rd,rn,offset_12) EOP_C_AM2_IMM(cond,1,1,1,rn,rd,offset_12)
 178
 179 #define EOP_LDR_IMM(   rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,1,0,1,rn,rd,offset_12)
 180 #define EOP_LDR_NEGIMM(rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,0,0,1,rn,rd,offset_12)
 181 #define EOP_LDR_SIMPLE(rd,rn)           EOP_C_AM2_IMM(A_COND_AL,1,0,1,rn,rd,0)
 182 #define EOP_STR_IMM(   rd,rn,offset_12) EOP_C_AM2_IMM(A_COND_AL,1,0,0,rn,rd,offset_12)
 183 #define EOP_STR_SIMPLE(rd,rn)           EOP_C_AM2_IMM(A_COND_AL,1,0,0,rn,rd,0)
 184
 185 #define EOP_LDR_REG_LSL(cond,rd,rn,rm,shift_imm) EOP_C_AM2_REG(cond,1,0,1,rn,rd,shift_imm,A_AM1_LSL,rm)
 186
 187 #define EOP_LDRH_IMM2(cond,rd,rn,offset_8)  EOP_C_AM3_IMM(cond,1,1,rn,rd,0,1,offset_8)
 188
 189 #define EOP_LDRH_IMM(   rd,rn,offset_8)  EOP_C_AM3_IMM(A_COND_AL,1,1,rn,rd,0,1,offset_8)
 190 #define EOP_LDRH_SIMPLE(rd,rn)           EOP_C_AM3_IMM(A_COND_AL,1,1,rn,rd,0,1,0)
 191 #define EOP_LDRH_REG(   rd,rn,rm)        EOP_C_AM3_REG(A_COND_AL,1,1,rn,rd,0,1,rm)
 192 #define EOP_STRH_IMM(   rd,rn,offset_8)  EOP_C_AM3_IMM(A_COND_AL,1,0,rn,rd,0,1,offset_8)
 193 #define EOP_STRH_SIMPLE(rd,rn)           EOP_C_AM3_IMM(A_COND_AL,1,0,rn,rd,0,1,0)
 194 #define EOP_STRH_REG(   rd,rn,rm)        EOP_C_AM3_REG(A_COND_AL,1,0,rn,rd,0,1,rm)
 195
 196 /* ldm and stm */
 197 #define EOP_XXM(cond,p,u,s,w,l,rn,list) \
 198         EMIT(((cond)<<28) | (1<<27) | ((p)<<24) | ((u)<<23) | ((s)<<22) | ((w)<<21) | ((l)<<20) | ((rn)<<16) | (list))
 199
 200 #define EOP_STMIA(rb,list) EOP_XXM(A_COND_AL,0,1,0,0,0,rb,list)
 201 #define EOP_LDMIA(rb,list) EOP_XXM(A_COND_AL,0,1,0,0,1,rb,list)
 202
 203 #define EOP_STMFD_SP(list) EOP_XXM(A_COND_AL,1,0,0,1,0,13,list)
 204 #define EOP_LDMFD_SP(list) EOP_XXM(A_COND_AL,0,1,0,1,1,13,list)
 205
 206 /* branches */
 207 #define EOP_C_BX(cond,rm) \
 208         EMIT(((cond)<<28) | 0x012fff10 | (rm))
 209
 210 #define EOP_C_B_PTR(ptr,cond,l,signed_immed_24) \
 211         EMIT_PTR(ptr, ((cond)<<28) | 0x0a000000 | ((l)<<24) | (signed_immed_24))
 212
 213 #define EOP_C_B(cond,l,signed_immed_24) \
 214         EOP_C_B_PTR(tcache_ptr,cond,l,signed_immed_24)
 215
 216 #define EOP_B( signed_immed_24) EOP_C_B(A_COND_AL,0,signed_immed_24)
 217 #define EOP_BL(signed_immed_24) EOP_C_B(A_COND_AL,1,signed_immed_24)
 218
 219 /* misc */
 220 #define EOP_C_MUL(cond,s,rd,rs,rm) \
 221         EMIT(((cond)<<28) | ((s)<<20) | ((rd)<<16) | ((rs)<<8) | 0x90 | (rm))
 222
 223 #define EOP_C_UMULL(cond,s,rdhi,rdlo,rs,rm) \
 224         EMIT(((cond)<<28) | 0x00800000 | ((s)<<20) | ((rdhi)<<16) | ((rdlo)<<12) | ((rs)<<8) | 0x90 | (rm))
 225
 226 #define EOP_C_SMULL(cond,s,rdhi,rdlo,rs,rm) \
 227         EMIT(((cond)<<28) | 0x00c00000 | ((s)<<20) | ((rdhi)<<16) | ((rdlo)<<12) | ((rs)<<8) | 0x90 | (rm))
 228
 229 #define EOP_C_SMLAL(cond,s,rdhi,rdlo,rs,rm) \
 230         EMIT(((cond)<<28) | 0x00e00000 | ((s)<<20) | ((rdhi)<<16) | ((rdlo)<<12) | ((rs)<<8) | 0x90 | (rm))
 231
 232 #define EOP_MUL(rd,rm,rs) EOP_C_MUL(A_COND_AL,0,rd,rs,rm) // note: rd != rm
 233
 234 #define EOP_C_MRS(cond,rd) \
 235         EMIT(((cond)<<28) | 0x010f0000 | ((rd)<<12))
 236
 237 #define EOP_C_MSR_IMM(cond,ror2,imm) \
 238         EMIT(((cond)<<28) | 0x0328f000 | ((ror2)<<8) | (imm)) // cpsr_f
 239
 240 #define EOP_C_MSR_REG(cond,rm) \
 241         EMIT(((cond)<<28) | 0x0128f000 | (rm)) // cpsr_f
 242
 243 #define EOP_MRS(rd)           EOP_C_MRS(A_COND_AL,rd)
 244 #define EOP_MSR_IMM(ror2,imm) EOP_C_MSR_IMM(A_COND_AL,ror2,imm)
 245 #define EOP_MSR_REG(rm)       EOP_C_MSR_REG(A_COND_AL,rm)
 246
 247 #define EOP_MOVW(rd,imm) \
 248         EMIT(0xe3000000 | ((rd)<<12) | ((imm)&0xfff) | (((imm)<<4)&0xf0000))
 249
 250 #define EOP_MOVT(rd,imm) \
 251         EMIT(0xe3400000 | ((rd)<<12) | (((imm)>>16)&0xfff) | (((imm)>>12)&0xf0000))
 252
 253 // XXX: AND, RSB, *C, will break if 1 insn is not enough
 254 static void emith_op_imm2(int cond, int s, int op, int rd, int rn, unsigned int imm)
 255 {
 256         int ror2;
 257         u32 v;
 258
 259         switch (op) {
 260         case A_OP_MOV:
 261                 rn = 0;
 262                 if (~imm < 0x10000) {
 263                         imm = ~imm;
 264                         op = A_OP_MVN;
 265                 }
 266 #ifdef HAVE_ARMV7
 267                 for (v = imm, ror2 = 0; v && !(v & 3); v >>= 2)
 268                         ror2--;
 269                 if (v >> 8) {
 270                         /* 2+ insns needed - prefer movw/movt */
 271                         if (op == A_OP_MVN)
 272                                 imm = ~imm;
 273                         EOP_MOVW(rd, imm);
 274                         if (imm & 0xffff0000)
 275                                 EOP_MOVT(rd, imm);
 276                         return;
 277                 }
 278 #endif
 279                 break;
 280
 281         case A_OP_EOR:
 282         case A_OP_SUB:
 283         case A_OP_ADD:
 284         case A_OP_ORR:
 285         case A_OP_BIC:
 286                 if (s == 0 && imm == 0)
 287                         return;
 288                 break;
 289         }
 290
 291         for (v = imm, ror2 = 0; ; ror2 -= 8/2) {
 292                 /* shift down to get 'best' rot2 */
 293                 for (; v && !(v & 3); v >>= 2)
 294                         ror2--;
 295
 296                 EOP_C_DOP_IMM(cond, op, s, rn, rd, ror2 & 0x0f, v & 0xff);
 297
 298                 v >>= 8;
 299                 if (v == 0)
 300                         break;
 301                 if (op == A_OP_MOV)
 302                         op = A_OP_ORR;
 303                 if (op == A_OP_MVN)
 304                         op = A_OP_BIC;
 305                 rn = rd;
 306         }
 307 }
 308
 309 #define emith_op_imm(cond, s, op, r, imm) \
 310         emith_op_imm2(cond, s, op, r, r, imm)
 311
 312 // test op
 313 #define emith_top_imm(cond, op, r, imm) do { \
 314         u32 ror2, v; \
 315         for (ror2 = 0, v = imm; v && !(v & 3); v >>= 2) \
 316                 ror2--; \
 317         EOP_C_DOP_IMM(cond, op, 1, r, 0, ror2 & 0x0f, v & 0xff); \
 318 } while (0)
 319
 320 #define is_offset_24(val) \
 321         ((val) >= (int)0xff000000 && (val) <= 0x00ffffff)
 322
 323 static int emith_xbranch(int cond, void *target, int is_call)
 324 {
 325         int val = (u32 *)target - (u32 *)tcache_ptr - 2;
 326         int direct = is_offset_24(val);
 327         u32 *start_ptr = (u32 *)tcache_ptr;
 328
 329         if (direct)
 330         {
 331                 EOP_C_B(cond,is_call,val & 0xffffff);           // b, bl target
 332         }
 333         else
 334         {
 335 #ifdef __EPOC32__
 336 //              elprintf(EL_SVP, "emitting indirect jmp %08x->%08x", tcache_ptr, target);
 337                 if (is_call)
 338                         EOP_ADD_IMM(14,15,0,8);                 // add lr,pc,#8
 339                 EOP_C_AM2_IMM(cond,1,0,1,15,15,0);              // ldrcc pc,[pc]
 340                 EOP_MOV_REG_SIMPLE(15,15);                      // mov pc, pc
 341                 EMIT((u32)target);
 342 #else
 343                 // should never happen
 344                 elprintf(EL_STATUS|EL_SVP|EL_ANOMALY, "indirect jmp %08x->%08x", target, tcache_ptr);
 345                 exit(1);
 346 #endif
 347         }
 348
 349         return (u32 *)tcache_ptr - start_ptr;
 350 }
 351
 352 #define JMP_POS(ptr) \
 353         ptr = tcache_ptr; \
 354         tcache_ptr += sizeof(u32)
 355
 356 #define JMP_EMIT(cond, ptr) { \
 357         u32 val_ = (u32 *)tcache_ptr - (u32 *)(ptr) - 2; \
 358         EOP_C_B_PTR(ptr, cond, 0, val_ & 0xffffff); \
 359 }
 360
 361 #define EMITH_JMP_START(cond) { \
 362         void *cond_ptr; \
 363         JMP_POS(cond_ptr)
 364
 365 #define EMITH_JMP_END(cond) \
 366         JMP_EMIT(cond, cond_ptr); \
 367 }
 368
 369 // fake "simple" or "short" jump - using cond insns instead
 370 #define EMITH_NOTHING1(cond) \
 371         (void)(cond)
 372
 373 #define EMITH_SJMP_DECL_()
 374 #define EMITH_SJMP_START_(cond) EMITH_NOTHING1(cond)
 375 #define EMITH_SJMP_END_(cond)   EMITH_NOTHING1(cond)
 376 #define EMITH_SJMP_START(cond)  EMITH_NOTHING1(cond)
 377 #define EMITH_SJMP_END(cond)    EMITH_NOTHING1(cond)
 378 #define EMITH_SJMP3_START(cond) EMITH_NOTHING1(cond)
 379 #define EMITH_SJMP3_MID(cond)   EMITH_NOTHING1(cond)
 380 #define EMITH_SJMP3_END()
 381
 382 #define emith_move_r_r(d, s) \
 383         EOP_MOV_REG_SIMPLE(d, s)
 384
 385 #define emith_move_r_r_ptr(d, s) \
 386         emith_move_r_r(d, s)
 387
 388 #define emith_mvn_r_r(d, s) \
 389         EOP_MVN_REG(A_COND_AL,0,d,s,A_AM1_LSL,0)
 390
 391 #define emith_add_r_r_r_lsl(d, s1, s2, lslimm) \
 392         EOP_ADD_REG(A_COND_AL,0,d,s1,s2,A_AM1_LSL,lslimm)
 393
 394 #define emith_or_r_r_r_lsl(d, s1, s2, lslimm) \
 395         EOP_ORR_REG(A_COND_AL,0,d,s1,s2,A_AM1_LSL,lslimm)
 396
 397 #define emith_eor_r_r_r_lsl(d, s1, s2, lslimm) \
 398         EOP_EOR_REG(A_COND_AL,0,d,s1,s2,A_AM1_LSL,lslimm)
 399
 400 #define emith_eor_r_r_r_lsr(d, s1, s2, lsrimm) \
 401         EOP_EOR_REG(A_COND_AL,0,d,s1,s2,A_AM1_LSR,lsrimm)
 402
 403 #define emith_or_r_r_lsl(d, s, lslimm) \
 404         emith_or_r_r_r_lsl(d, d, s, lslimm)
 405
 406 #define emith_eor_r_r_lsr(d, s, lsrimm) \
 407         emith_eor_r_r_r_lsr(d, d, s, lsrimm)
 408
 409 #define emith_add_r_r_r(d, s1, s2) \
 410         emith_add_r_r_r_lsl(d, s1, s2, 0)
 411
 412 #define emith_or_r_r_r(d, s1, s2) \
 413         emith_or_r_r_r_lsl(d, s1, s2, 0)
 414
 415 #define emith_eor_r_r_r(d, s1, s2) \
 416         emith_eor_r_r_r_lsl(d, s1, s2, 0)
 417
 418 #define emith_add_r_r(d, s) \
 419         emith_add_r_r_r(d, d, s)
 420
 421 #define emith_sub_r_r(d, s) \
 422         EOP_SUB_REG(A_COND_AL,0,d,d,s,A_AM1_LSL,0)
 423
 424 #define emith_adc_r_r(d, s) \
 425         EOP_ADC_REG(A_COND_AL,0,d,d,s,A_AM1_LSL,0)
 426
 427 #define emith_and_r_r(d, s) \
 428         EOP_AND_REG(A_COND_AL,0,d,d,s,A_AM1_LSL,0)
 429
 430 #define emith_or_r_r(d, s) \
 431         emith_or_r_r_r(d, d, s)
 432
 433 #define emith_eor_r_r(d, s) \
 434         emith_eor_r_r_r(d, d, s)
 435
 436 #define emith_tst_r_r(d, s) \
 437         EOP_TST_REG(A_COND_AL,d,s,A_AM1_LSL,0)
 438
 439 #define emith_teq_r_r(d, s) \
 440         EOP_TEQ_REG(A_COND_AL,d,s,A_AM1_LSL,0)
 441
 442 #define emith_cmp_r_r(d, s) \
 443         EOP_CMP_REG(A_COND_AL,d,s,A_AM1_LSL,0)
 444
 445 #define emith_addf_r_r(d, s) \
 446         EOP_ADD_REG(A_COND_AL,1,d,d,s,A_AM1_LSL,0)
 447
 448 #define emith_subf_r_r(d, s) \
 449         EOP_SUB_REG(A_COND_AL,1,d,d,s,A_AM1_LSL,0)
 450
 451 #define emith_adcf_r_r(d, s) \
 452         EOP_ADC_REG(A_COND_AL,1,d,d,s,A_AM1_LSL,0)
 453
 454 #define emith_sbcf_r_r(d, s) \
 455         EOP_SBC_REG(A_COND_AL,1,d,d,s,A_AM1_LSL,0)
 456
 457 #define emith_eorf_r_r(d, s) \
 458         EOP_EOR_REG(A_COND_AL,1,d,d,s,A_AM1_LSL,0)
 459
 460 #define emith_move_r_imm(r, imm) \
 461         emith_op_imm(A_COND_AL, 0, A_OP_MOV, r, imm)
 462
 463 #define emith_add_r_imm(r, imm) \
 464         emith_op_imm(A_COND_AL, 0, A_OP_ADD, r, imm)
 465
 466 #define emith_adc_r_imm(r, imm) \
 467         emith_op_imm(A_COND_AL, 0, A_OP_ADC, r, imm)
 468
 469 #define emith_sub_r_imm(r, imm) \
 470         emith_op_imm(A_COND_AL, 0, A_OP_SUB, r, imm)
 471
 472 #define emith_bic_r_imm(r, imm) \
 473         emith_op_imm(A_COND_AL, 0, A_OP_BIC, r, imm)
 474
 475 #define emith_and_r_imm(r, imm) \
 476         emith_op_imm(A_COND_AL, 0, A_OP_AND, r, imm)
 477
 478 #define emith_or_r_imm(r, imm) \
 479         emith_op_imm(A_COND_AL, 0, A_OP_ORR, r, imm)
 480
 481 #define emith_eor_r_imm(r, imm) \
 482         emith_op_imm(A_COND_AL, 0, A_OP_EOR, r, imm)
 483
 484 // note: only use 8bit imm for these
 485 #define emith_tst_r_imm(r, imm) \
 486         emith_top_imm(A_COND_AL, A_OP_TST, r, imm)
 487
 488 #define emith_cmp_r_imm(r, imm) { \
 489         u32 op = A_OP_CMP, imm_ = imm; \
 490         if (~imm_ < 0x100) { \
 491                 imm_ = ~imm_; \
 492                 op = A_OP_CMN; \
 493         } \
 494         emith_top_imm(A_COND_AL, op, r, imm); \
 495 }
 496
 497 #define emith_subf_r_imm(r, imm) \
 498         emith_op_imm(A_COND_AL, 1, A_OP_SUB, r, imm)
 499
 500 #define emith_move_r_imm_c(cond, r, imm) \
 501         emith_op_imm(cond, 0, A_OP_MOV, r, imm)
 502
 503 #define emith_add_r_imm_c(cond, r, imm) \
 504         emith_op_imm(cond, 0, A_OP_ADD, r, imm)
 505
 506 #define emith_sub_r_imm_c(cond, r, imm) \
 507         emith_op_imm(cond, 0, A_OP_SUB, r, imm)
 508
 509 #define emith_or_r_imm_c(cond, r, imm) \
 510         emith_op_imm(cond, 0, A_OP_ORR, r, imm)
 511
 512 #define emith_eor_r_imm_c(cond, r, imm) \
 513         emith_op_imm(cond, 0, A_OP_EOR, r, imm)
 514
 515 #define emith_bic_r_imm_c(cond, r, imm) \
 516         emith_op_imm(cond, 0, A_OP_BIC, r, imm)
 517
 518 #define emith_move_r_imm_s8(r, imm) { \
 519         if ((imm) & 0x80) \
 520                 EOP_MVN_IMM(r, 0, ((imm) ^ 0xff)); \
 521         else \
 522                 EOP_MOV_IMM(r, 0, imm); \
 523 }
 524
 525 #define emith_and_r_r_imm(d, s, imm) \
 526         emith_op_imm2(A_COND_AL, 0, A_OP_AND, d, s, imm)
 527
 528 #define emith_add_r_r_imm(d, s, imm) \
 529         emith_op_imm2(A_COND_AL, 0, A_OP_ADD, d, s, imm)
 530
 531 #define emith_add_r_r_ptr_imm(d, s, imm) \
 532         emith_add_r_r_imm(d, s, imm)
 533
 534 #define emith_sub_r_r_imm(d, s, imm) \
 535         emith_op_imm2(A_COND_AL, 0, A_OP_SUB, d, s, imm)
 536
 537 #define emith_neg_r_r(d, s) \
 538         EOP_RSB_IMM(d, s, 0, 0)
 539
 540 #define emith_lsl(d, s, cnt) \
 541         EOP_MOV_REG(A_COND_AL,0,d,s,A_AM1_LSL,cnt)
 542
 543 #define emith_lsr(d, s, cnt) \
 544         EOP_MOV_REG(A_COND_AL,0,d,s,A_AM1_LSR,cnt)
 545
 546 #define emith_asr(d, s, cnt) \
 547         EOP_MOV_REG(A_COND_AL,0,d,s,A_AM1_ASR,cnt)
 548
 549 #define emith_ror_c(cond, d, s, cnt) \
 550         EOP_MOV_REG(cond,0,d,s,A_AM1_ROR,cnt)
 551
 552 #define emith_ror(d, s, cnt) \
 553         emith_ror_c(A_COND_AL, d, s, cnt)
 554
 555 #define emith_rol(d, s, cnt) \
 556         EOP_MOV_REG(A_COND_AL,0,d,s,A_AM1_ROR,32-(cnt)); \
 557
 558 #define emith_lslf(d, s, cnt) \
 559         EOP_MOV_REG(A_COND_AL,1,d,s,A_AM1_LSL,cnt)
 560
 561 #define emith_lsrf(d, s, cnt) \
 562         EOP_MOV_REG(A_COND_AL,1,d,s,A_AM1_LSR,cnt)
 563
 564 #define emith_asrf(d, s, cnt) \
 565         EOP_MOV_REG(A_COND_AL,1,d,s,A_AM1_ASR,cnt)
 566
 567 // note: only C flag updated correctly
 568 #define emith_rolf(d, s, cnt) { \
 569         EOP_MOV_REG(A_COND_AL,1,d,s,A_AM1_ROR,32-(cnt)); \
 570         /* we don't have ROL so we shift to get the right carry */ \
 571         EOP_TST_REG(A_COND_AL,d,d,A_AM1_LSR,1); \
 572 }
 573
 574 #define emith_rorf(d, s, cnt) \
 575         EOP_MOV_REG(A_COND_AL,1,d,s,A_AM1_ROR,cnt)
 576
 577 #define emith_rolcf(d) \
 578         emith_adcf_r_r(d, d)
 579
 580 #define emith_rorcf(d) \
 581         EOP_MOV_REG(A_COND_AL,1,d,d,A_AM1_ROR,0) /* ROR #0 -> RRX */
 582
 583 #define emith_negcf_r_r(d, s) \
 584         EOP_C_DOP_IMM(A_COND_AL,A_OP_RSC,1,s,d,0,0)
 585
 586 #define emith_mul(d, s1, s2) { \
 587         if ((d) != (s1)) /* rd != rm limitation */ \
 588                 EOP_MUL(d, s1, s2); \
 589         else \
 590                 EOP_MUL(d, s2, s1); \
 591 }
 592
 593 #define emith_mul_u64(dlo, dhi, s1, s2) \
 594         EOP_C_UMULL(A_COND_AL,0,dhi,dlo,s1,s2)
 595
 596 #define emith_mul_s64(dlo, dhi, s1, s2) \
 597         EOP_C_SMULL(A_COND_AL,0,dhi,dlo,s1,s2)
 598
 599 #define emith_mula_s64(dlo, dhi, s1, s2) \
 600         EOP_C_SMLAL(A_COND_AL,0,dhi,dlo,s1,s2)
 601
 602 // misc
 603 #define emith_read_r_r_offs_c(cond, r, rs, offs) \
 604         EOP_LDR_IMM2(cond, r, rs, offs)
 605
 606 #define emith_read8_r_r_offs_c(cond, r, rs, offs) \
 607         EOP_LDRB_IMM2(cond, r, rs, offs)
 608
 609 #define emith_read16_r_r_offs_c(cond, r, rs, offs) \
 610         EOP_LDRH_IMM2(cond, r, rs, offs)
 611
 612 #define emith_read_r_r_offs(r, rs, offs) \
 613         emith_read_r_r_offs_c(A_COND_AL, r, rs, offs)
 614
 615 #define emith_read8_r_r_offs(r, rs, offs) \
 616         emith_read8_r_r_offs_c(A_COND_AL, r, rs, offs)
 617
 618 #define emith_read16_r_r_offs(r, rs, offs) \
 619         emith_read16_r_r_offs_c(A_COND_AL, r, rs, offs)
 620
 621 #define emith_ctx_read(r, offs) \
 622         emith_read_r_r_offs(r, CONTEXT_REG, offs)
 623
 624 #define emith_ctx_read_ptr(r, offs) \
 625         emith_ctx_read(r, offs)
 626
 627 #define emith_ctx_write(r, offs) \
 628         EOP_STR_IMM(r, CONTEXT_REG, offs)
 629
 630 #define emith_ctx_do_multiple(op, r, offs, count, tmpr) do { \
 631         int v_, r_ = r, c_ = count, b_ = CONTEXT_REG;        \
 632         for (v_ = 0; c_; c_--, r_++)                         \
 633                 v_ |= 1 << r_;                               \
 634         if ((offs) != 0) {                                   \
 635                 EOP_ADD_IMM(tmpr,CONTEXT_REG,30/2,(offs)>>2);\
 636                 b_ = tmpr;                                   \
 637         }                                                    \
 638         op(b_,v_);                                           \
 639 } while(0)
 640
 641 #define emith_ctx_read_multiple(r, offs, count, tmpr) \
 642         emith_ctx_do_multiple(EOP_LDMIA, r, offs, count, tmpr)
 643
 644 #define emith_ctx_write_multiple(r, offs, count, tmpr) \
 645         emith_ctx_do_multiple(EOP_STMIA, r, offs, count, tmpr)
 646
 647 #define emith_clear_msb_c(cond, d, s, count) { \
 648         u32 t; \
 649         if ((count) <= 8) { \
 650                 t = (count) - 8; \
 651                 t = (0xff << t) & 0xff; \
 652                 EOP_BIC_IMM(d,s,8/2,t); \
 653                 EOP_C_DOP_IMM(cond,A_OP_BIC,0,s,d,8/2,t); \
 654         } else if ((count) >= 24) { \
 655                 t = (count) - 24; \
 656                 t = 0xff >> t; \
 657                 EOP_AND_IMM(d,s,0,t); \
 658                 EOP_C_DOP_IMM(cond,A_OP_AND,0,s,d,0,t); \
 659         } else { \
 660                 EOP_MOV_REG(cond,0,d,s,A_AM1_LSL,count); \
 661                 EOP_MOV_REG(cond,0,d,d,A_AM1_LSR,count); \
 662         } \
 663 }
 664
 665 #define emith_clear_msb(d, s, count) \
 666         emith_clear_msb_c(A_COND_AL, d, s, count)
 667
 668 #define emith_sext(d, s, bits) { \
 669         EOP_MOV_REG_LSL(d,s,32 - (bits)); \
 670         EOP_MOV_REG_ASR(d,d,32 - (bits)); \
 671 }
 672
 673 #define emith_do_caller_regs(mask, func) { \
 674         u32 _reg_mask = (mask) & 0x500f; \
 675         if (_reg_mask) { \
 676                 if (__builtin_parity(_reg_mask) == 1) \
 677                         _reg_mask |= 0x10; /* eabi align */ \
 678                 func(_reg_mask); \
 679         } \
 680 }
 681
 682 #define emith_save_caller_regs(mask) \
 683         emith_do_caller_regs(mask, EOP_STMFD_SP)
 684
 685 #define emith_restore_caller_regs(mask) \
 686         emith_do_caller_regs(mask, EOP_LDMFD_SP)
 687
 688 // upto 4 args
 689 #define emith_pass_arg_r(arg, reg) \
 690         EOP_MOV_REG_SIMPLE(arg, reg)
 691
 692 #define emith_pass_arg_imm(arg, imm) \
 693         emith_move_r_imm(arg, imm)
 694
 695 #define emith_jump(target) \
 696         emith_jump_cond(A_COND_AL, target)
 697
 698 #define emith_jump_patchable(target) \
 699         emith_jump(target)
 700
 701 #define emith_jump_cond(cond, target) \
 702         emith_xbranch(cond, target, 0)
 703
 704 #define emith_jump_cond_patchable(cond, target) \
 705         emith_jump_cond(cond, target)
 706
 707 #define emith_jump_patch(ptr, target) do { \
 708         u32 *ptr_ = ptr; \
 709         u32 val_ = (u32 *)(target) - ptr_ - 2; \
 710         *ptr_ = (*ptr_ & 0xff000000) | (val_ & 0x00ffffff); \
 711 } while (0)
 712
 713 #define emith_jump_at(ptr, target) { \
 714         u32 val_ = (u32 *)(target) - (u32 *)(ptr) - 2; \
 715         EOP_C_B_PTR(ptr, A_COND_AL, 0, val_ & 0xffffff); \
 716 }
 717
 718 #define emith_jump_reg_c(cond, r) \
 719         EOP_C_BX(cond, r)
 720
 721 #define emith_jump_reg(r) \
 722         emith_jump_reg_c(A_COND_AL, r)
 723
 724 #define emith_jump_ctx_c(cond, offs) \
 725         EOP_LDR_IMM2(cond,15,CONTEXT_REG,offs)
 726
 727 #define emith_jump_ctx(offs) \
 728         emith_jump_ctx_c(A_COND_AL, offs)
 729
 730 #define emith_call_cond(cond, target) \
 731         emith_xbranch(cond, target, 1)
 732
 733 #define emith_call(target) \
 734         emith_call_cond(A_COND_AL, target)
 735
 736 #define emith_call_ctx(offs) { \
 737         emith_move_r_r(14, 15); \
 738         emith_jump_ctx(offs); \
 739 }
 740
 741 #define emith_ret_c(cond) \
 742         emith_jump_reg_c(cond, 14)
 743
 744 #define emith_ret() \
 745         emith_ret_c(A_COND_AL)
 746
 747 #define emith_ret_to_ctx(offs) \
 748         emith_ctx_write(14, offs)
 749
 750 #define emith_push_ret() \
 751         EOP_STMFD_SP(A_R14M)
 752
 753 #define emith_pop_and_ret() \
 754         EOP_LDMFD_SP(A_R15M)
 755
 756 #define host_instructions_updated(base, end) \
 757         cache_flush_d_inval_i(base, end)
 758
 759 #define host_arg2reg(rd, arg) \
 760         rd = arg
 761
 762 /* SH2 drc specific */
 763 /* pushes r12 for eabi alignment */
 764 #define emith_sh2_drc_entry() \
 765         EOP_STMFD_SP(A_R4M|A_R5M|A_R6M|A_R7M|A_R8M|A_R9M|A_R10M|A_R11M|A_R12M|A_R14M)
 766
 767 #define emith_sh2_drc_exit() \
 768         EOP_LDMFD_SP(A_R4M|A_R5M|A_R6M|A_R7M|A_R8M|A_R9M|A_R10M|A_R11M|A_R12M|A_R15M)
 769
 770 #define emith_sh2_wcall(a, tab) { \
 771         emith_lsr(12, a, SH2_WRITE_SHIFT); \
 772         EOP_LDR_REG_LSL(A_COND_AL,12,tab,12,2); \
 773         emith_move_r_r(2, CONTEXT_REG); \
 774         emith_jump_reg(12); \
 775 }
 776
 777 #define emith_sh2_dtbf_loop() { \
 778         int cr, rn;                                                          \
 779         int tmp_ = rcache_get_tmp();                                         \
 780         cr = rcache_get_reg(SHR_SR, RC_GR_RMW);                              \
 781         rn = rcache_get_reg((op >> 8) & 0x0f, RC_GR_RMW);                    \
 782         emith_sub_r_imm(rn, 1);                /* sub rn, #1 */              \
 783         emith_bic_r_imm(cr, 1);                /* bic cr, #1 */              \
 784         emith_sub_r_imm(cr, (cycles+1) << 12); /* sub cr, #(cycles+1)<<12 */ \
 785         cycles = 0;                                                          \
 786         emith_asrf(tmp_, cr, 2+12);            /* movs tmp_, cr, asr #2+12 */\
 787         EOP_MOV_IMM_C(A_COND_MI,tmp_,0,0);     /* movmi tmp_, #0 */          \
 788         emith_lsl(cr, cr, 20);                 /* mov cr, cr, lsl #20 */     \
 789         emith_lsr(cr, cr, 20);                 /* mov cr, cr, lsr #20 */     \
 790         emith_subf_r_r(rn, tmp_);              /* subs rn, tmp_ */           \
 791         EOP_RSB_IMM_C(A_COND_LS,tmp_,rn,0,0);  /* rsbls tmp_, rn, #0 */      \
 792         EOP_ORR_REG(A_COND_LS,0,cr,cr,tmp_,A_AM1_LSL,12+2); /* orrls cr,tmp_,lsl #12+2 */\
 793         EOP_ORR_IMM_C(A_COND_LS,cr,cr,0,1);    /* orrls cr, #1 */            \
 794         EOP_MOV_IMM_C(A_COND_LS,rn,0,0);       /* movls rn, #0 */            \
 795         rcache_free_tmp(tmp_);                                               \
 796 }
 797
 798 #define emith_write_sr(sr, srcr) { \
 799         emith_lsr(sr, sr, 10); \
 800         emith_or_r_r_r_lsl(sr, sr, srcr, 22); \
 801         emith_ror(sr, sr, 22); \
 802 }
 803
 804 #define emith_carry_to_t(srr, is_sub) { \
 805         if (is_sub) { /* has inverted C on ARM */ \
 806                 emith_or_r_imm_c(A_COND_CC, srr, 1); \
 807                 emith_bic_r_imm_c(A_COND_CS, srr, 1); \
 808         } else { \
 809                 emith_or_r_imm_c(A_COND_CS, srr, 1); \
 810                 emith_bic_r_imm_c(A_COND_CC, srr, 1); \
 811         } \
 812 }
 813
 814 #define emith_tpop_carry(sr, is_sub) {  \
 815         if (is_sub)                     \
 816                 emith_eor_r_imm(sr, 1); \
 817         emith_lsrf(sr, sr, 1);          \
 818 }
 819
 820 #define emith_tpush_carry(sr, is_sub) { \
 821         emith_adc_r_r(sr, sr);          \
 822         if (is_sub)                     \
 823                 emith_eor_r_imm(sr, 1); \
 824 }
 825
 826 /*
 827  * if Q
 828  *   t = carry(Rn += Rm)
 829  * else
 830  *   t = carry(Rn -= Rm)
 831  * T ^= t
 832  */
 833 #define emith_sh2_div1_step(rn, rm, sr) {         \
 834         void *jmp0, *jmp1;                        \
 835         emith_tst_r_imm(sr, Q);  /* if (Q ^ M) */ \
 836         JMP_POS(jmp0);           /* beq do_sub */ \
 837         emith_addf_r_r(rn, rm);                   \
 838         emith_eor_r_imm_c(A_COND_CS, sr, T);      \
 839         JMP_POS(jmp1);           /* b done */     \
 840         JMP_EMIT(A_COND_EQ, jmp0); /* do_sub: */  \
 841         emith_subf_r_r(rn, rm);                   \
 842         emith_eor_r_imm_c(A_COND_CC, sr, T);      \
 843         JMP_EMIT(A_COND_AL, jmp1); /* done: */    \
 844 }
 845