sljit_src/sljitNativePPC_32.c

   1 /*
   2  *    Stack-less Just-In-Time compiler
   3  *
   4  *    Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without modification, are
   7  * permitted provided that the following conditions are met:
   8  *
   9  *   1. Redistributions of source code must retain the above copyright notice, this list of
  10  *      conditions and the following disclaimer.
  11  *
  12  *   2. Redistributions in binary form must reproduce the above copyright notice, this list
  13  *      of conditions and the following disclaimer in the documentation and/or other materials
  14  *      provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  19  * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  22  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /* ppc 32-bit arch dependent functions. */
  28
  29 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
  30 {
  31         if (imm <= SIMM_MAX && imm >= SIMM_MIN)
  32                 return push_inst(compiler, ADDI | D(reg) | A(0) | IMM(imm));
  33
  34         if (!(imm & ~0xffff))
  35                 return push_inst(compiler, ORI | S(TMP_ZERO) | A(reg) | IMM(imm));
  36
  37         FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(imm >> 16)));
  38         return (imm & 0xffff) ? push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm)) : SLJIT_SUCCESS;
  39 }
  40
  41 #define INS_CLEAR_LEFT(dst, src, from) \
  42         (RLWINM | S(src) | A(dst) | ((from) << 6) | (31 << 1))
  43
  44 static SLJIT_INLINE sljit_s32 emit_single_op(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 flags,
  45         sljit_s32 dst, sljit_s32 src1, sljit_s32 src2)
  46 {
  47         switch (op) {
  48         case SLJIT_MOV:
  49         case SLJIT_MOV_U32:
  50         case SLJIT_MOV_S32:
  51         case SLJIT_MOV_P:
  52                 SLJIT_ASSERT(src1 == TMP_REG1);
  53                 if (dst != src2)
  54                         return push_inst(compiler, OR | S(src2) | A(dst) | B(src2));
  55                 return SLJIT_SUCCESS;
  56
  57         case SLJIT_MOV_U8:
  58         case SLJIT_MOV_S8:
  59                 SLJIT_ASSERT(src1 == TMP_REG1);
  60                 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
  61                         if (op == SLJIT_MOV_S8)
  62                                 return push_inst(compiler, EXTSB | S(src2) | A(dst));
  63                         return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 24));
  64                 }
  65                 else if ((flags & REG_DEST) && op == SLJIT_MOV_S8)
  66                         return push_inst(compiler, EXTSB | S(src2) | A(dst));
  67                 else {
  68                         SLJIT_ASSERT(dst == src2);
  69                 }
  70                 return SLJIT_SUCCESS;
  71
  72         case SLJIT_MOV_U16:
  73         case SLJIT_MOV_S16:
  74                 SLJIT_ASSERT(src1 == TMP_REG1);
  75                 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
  76                         if (op == SLJIT_MOV_S16)
  77                                 return push_inst(compiler, EXTSH | S(src2) | A(dst));
  78                         return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 16));
  79                 }
  80                 else {
  81                         SLJIT_ASSERT(dst == src2);
  82                 }
  83                 return SLJIT_SUCCESS;
  84
  85         case SLJIT_NOT:
  86                 SLJIT_ASSERT(src1 == TMP_REG1);
  87                 return push_inst(compiler, NOR | RC(flags) | S(src2) | A(dst) | B(src2));
  88
  89         case SLJIT_NEG:
  90                 SLJIT_ASSERT(src1 == TMP_REG1);
  91                 /* Setting XER SO is not enough, CR SO is also needed. */
  92                 return push_inst(compiler, NEG | OE((flags & ALT_FORM1) ? ALT_SET_FLAGS : 0) | RC(flags) | D(dst) | A(src2));
  93
  94         case SLJIT_CLZ:
  95                 SLJIT_ASSERT(src1 == TMP_REG1);
  96                 return push_inst(compiler, CNTLZW | S(src2) | A(dst));
  97
  98         case SLJIT_ADD:
  99                 if (flags & ALT_FORM1) {
 100                         /* Setting XER SO is not enough, CR SO is also needed. */
 101                         return push_inst(compiler, ADD | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
 102                 }
 103
 104                 if (flags & ALT_FORM2) {
 105                         /* Flags does not set: BIN_IMM_EXTS unnecessary. */
 106                         SLJIT_ASSERT(src2 == TMP_REG2);
 107
 108                         if (flags & ALT_FORM3)
 109                                 return push_inst(compiler, ADDIS | D(dst) | A(src1) | compiler->imm);
 110
 111                         if (flags & ALT_FORM4) {
 112                                 FAIL_IF(push_inst(compiler, ADDIS | D(dst) | A(src1) | (((compiler->imm >> 16) & 0xffff) + ((compiler->imm >> 15) & 0x1))));
 113                                 src1 = dst;
 114                         }
 115
 116                         return push_inst(compiler, ADDI | D(dst) | A(src1) | (compiler->imm & 0xffff));
 117                 }
 118                 if (flags & ALT_FORM3) {
 119                         SLJIT_ASSERT(src2 == TMP_REG2);
 120                         return push_inst(compiler, ADDIC | D(dst) | A(src1) | compiler->imm);
 121                 }
 122                 SLJIT_ASSERT(!(flags & ALT_FORM4));
 123                 if (!(flags & ALT_SET_FLAGS))
 124                         return push_inst(compiler, ADD | D(dst) | A(src1) | B(src2));
 125                 if (flags & ALT_FORM5)
 126                         return push_inst(compiler, ADDC | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
 127                 return push_inst(compiler, ADD | RC(flags) | D(dst) | A(src1) | B(src2));
 128
 129         case SLJIT_ADDC:
 130                 return push_inst(compiler, ADDE | D(dst) | A(src1) | B(src2));
 131
 132         case SLJIT_SUB:
 133                 if (flags & ALT_FORM1) {
 134                         if (flags & ALT_FORM2) {
 135                                 FAIL_IF(push_inst(compiler, CMPLI | CRD(0) | A(src1) | compiler->imm));
 136                                 if (!(flags & ALT_FORM3))
 137                                         return SLJIT_SUCCESS;
 138                                 return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
 139                         }
 140                         FAIL_IF(push_inst(compiler, CMPL | CRD(0) | A(src1) | B(src2)));
 141                         if (!(flags & ALT_FORM3))
 142                                 return SLJIT_SUCCESS;
 143                         return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
 144                 }
 145
 146                 if (flags & ALT_FORM2) {
 147                         if (flags & ALT_FORM3) {
 148                                 FAIL_IF(push_inst(compiler, CMPI | CRD(0) | A(src1) | compiler->imm));
 149                                 if (!(flags & ALT_FORM4))
 150                                         return SLJIT_SUCCESS;
 151                                 return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
 152                         }
 153                         FAIL_IF(push_inst(compiler, CMP | CRD(0) | A(src1) | B(src2)));
 154                         if (!(flags & ALT_FORM4))
 155                                 return SLJIT_SUCCESS;
 156                         return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
 157                 }
 158
 159                 if (flags & ALT_FORM3) {
 160                         /* Setting XER SO is not enough, CR SO is also needed. */
 161                         return push_inst(compiler, SUBF | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
 162                 }
 163
 164                 if (flags & ALT_FORM4) {
 165                         /* Flags does not set: BIN_IMM_EXTS unnecessary. */
 166                         SLJIT_ASSERT(src2 == TMP_REG2);
 167                         return push_inst(compiler, SUBFIC | D(dst) | A(src1) | compiler->imm);
 168                 }
 169
 170                 if (!(flags & ALT_SET_FLAGS))
 171                         return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
 172                 if (flags & ALT_FORM5)
 173                         return push_inst(compiler, SUBFC | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
 174                 return push_inst(compiler, SUBF | RC(flags) | D(dst) | A(src2) | B(src1));
 175
 176         case SLJIT_SUBC:
 177                 return push_inst(compiler, SUBFE | D(dst) | A(src2) | B(src1));
 178
 179         case SLJIT_MUL:
 180                 if (flags & ALT_FORM1) {
 181                         SLJIT_ASSERT(src2 == TMP_REG2);
 182                         return push_inst(compiler, MULLI | D(dst) | A(src1) | compiler->imm);
 183                 }
 184                 return push_inst(compiler, MULLW | OE(flags) | RC(flags) | D(dst) | A(src2) | B(src1));
 185
 186         case SLJIT_AND:
 187                 if (flags & ALT_FORM1) {
 188                         SLJIT_ASSERT(src2 == TMP_REG2);
 189                         return push_inst(compiler, ANDI | S(src1) | A(dst) | compiler->imm);
 190                 }
 191                 if (flags & ALT_FORM2) {
 192                         SLJIT_ASSERT(src2 == TMP_REG2);
 193                         return push_inst(compiler, ANDIS | S(src1) | A(dst) | compiler->imm);
 194                 }
 195                 return push_inst(compiler, AND | RC(flags) | S(src1) | A(dst) | B(src2));
 196
 197         case SLJIT_OR:
 198                 if (flags & ALT_FORM1) {
 199                         SLJIT_ASSERT(src2 == TMP_REG2);
 200                         return push_inst(compiler, ORI | S(src1) | A(dst) | compiler->imm);
 201                 }
 202                 if (flags & ALT_FORM2) {
 203                         SLJIT_ASSERT(src2 == TMP_REG2);
 204                         return push_inst(compiler, ORIS | S(src1) | A(dst) | compiler->imm);
 205                 }
 206                 if (flags & ALT_FORM3) {
 207                         SLJIT_ASSERT(src2 == TMP_REG2);
 208                         FAIL_IF(push_inst(compiler, ORI | S(src1) | A(dst) | IMM(compiler->imm)));
 209                         return push_inst(compiler, ORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
 210                 }
 211                 return push_inst(compiler, OR | RC(flags) | S(src1) | A(dst) | B(src2));
 212
 213         case SLJIT_XOR:
 214                 if (flags & ALT_FORM1) {
 215                         SLJIT_ASSERT(src2 == TMP_REG2);
 216                         return push_inst(compiler, XORI | S(src1) | A(dst) | compiler->imm);
 217                 }
 218                 if (flags & ALT_FORM2) {
 219                         SLJIT_ASSERT(src2 == TMP_REG2);
 220                         return push_inst(compiler, XORIS | S(src1) | A(dst) | compiler->imm);
 221                 }
 222                 if (flags & ALT_FORM3) {
 223                         SLJIT_ASSERT(src2 == TMP_REG2);
 224                         FAIL_IF(push_inst(compiler, XORI | S(src1) | A(dst) | IMM(compiler->imm)));
 225                         return push_inst(compiler, XORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
 226                 }
 227                 return push_inst(compiler, XOR | RC(flags) | S(src1) | A(dst) | B(src2));
 228
 229         case SLJIT_SHL:
 230                 if (flags & ALT_FORM1) {
 231                         SLJIT_ASSERT(src2 == TMP_REG2);
 232                         compiler->imm &= 0x1f;
 233                         return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11) | ((31 - compiler->imm) << 1));
 234                 }
 235                 return push_inst(compiler, SLW | RC(flags) | S(src1) | A(dst) | B(src2));
 236
 237         case SLJIT_LSHR:
 238                 if (flags & ALT_FORM1) {
 239                         SLJIT_ASSERT(src2 == TMP_REG2);
 240                         compiler->imm &= 0x1f;
 241                         return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (((32 - compiler->imm) & 0x1f) << 11) | (compiler->imm << 6) | (31 << 1));
 242                 }
 243                 return push_inst(compiler, SRW | RC(flags) | S(src1) | A(dst) | B(src2));
 244
 245         case SLJIT_ASHR:
 246                 if (flags & ALT_FORM1) {
 247                         SLJIT_ASSERT(src2 == TMP_REG2);
 248                         compiler->imm &= 0x1f;
 249                         return push_inst(compiler, SRAWI | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11));
 250                 }
 251                 return push_inst(compiler, SRAW | RC(flags) | S(src1) | A(dst) | B(src2));
 252         }
 253
 254         SLJIT_UNREACHABLE();
 255         return SLJIT_SUCCESS;
 256 }
 257
 258 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw init_value)
 259 {
 260         FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(init_value >> 16)));
 261         return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value));
 262 }
 263
 264 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
 265 {
 266         sljit_ins *inst = (sljit_ins *)addr;
 267         SLJIT_UNUSED_ARG(executable_offset);
 268
 269         SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
 270         SLJIT_ASSERT((inst[0] & 0xfc1f0000) == ADDIS && (inst[1] & 0xfc000000) == ORI);
 271         inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 16) & 0xffff);
 272         inst[1] = (inst[1] & 0xffff0000) | (new_target & 0xffff);
 273         SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
 274         inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
 275         SLJIT_CACHE_FLUSH(inst, inst + 2);
 276 }
 277
 278 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
 279 {
 280         sljit_set_jump_addr(addr, (sljit_uw)new_constant, executable_offset);
 281 }