src/external/pcre2-10.32/src/sljit/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                 if (!(flags & ALT_SET_FLAGS))
 123                         return push_inst(compiler, ADD | D(dst) | A(src1) | B(src2));
 124                 if (flags & ALT_FORM4)
 125                         return push_inst(compiler, ADDC | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
 126                 return push_inst(compiler, ADD | RC(flags) | D(dst) | A(src1) | B(src2));
 127
 128         case SLJIT_ADDC:
 129                 return push_inst(compiler, ADDE | D(dst) | A(src1) | B(src2));
 130
 131         case SLJIT_SUB:
 132                 if (flags & ALT_FORM1) {
 133                         if (flags & ALT_FORM2) {
 134                                 FAIL_IF(push_inst(compiler, CMPLI | CRD(0) | A(src1) | compiler->imm));
 135                                 if (!(flags & ALT_FORM3))
 136                                         return SLJIT_SUCCESS;
 137                                 return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
 138                         }
 139                         FAIL_IF(push_inst(compiler, CMPL | CRD(0) | A(src1) | B(src2)));
 140                         if (!(flags & ALT_FORM3))
 141                                 return SLJIT_SUCCESS;
 142                         return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
 143                 }
 144
 145                 if (flags & ALT_FORM2) {
 146                         /* Setting XER SO is not enough, CR SO is also needed. */
 147                         return push_inst(compiler, SUBF | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
 148                 }
 149
 150                 if (flags & ALT_FORM3) {
 151                         /* Flags does not set: BIN_IMM_EXTS unnecessary. */
 152                         SLJIT_ASSERT(src2 == TMP_REG2);
 153                         return push_inst(compiler, SUBFIC | D(dst) | A(src1) | compiler->imm);
 154                 }
 155
 156                 if (flags & ALT_FORM4) {
 157                         if (flags & ALT_FORM5) {
 158                                 SLJIT_ASSERT(src2 == TMP_REG2);
 159                                 return push_inst(compiler, CMPI | CRD(0) | A(src1) | compiler->imm);
 160                         }
 161                         return push_inst(compiler, CMP | CRD(0) | A(src1) | B(src2));
 162                 }
 163
 164                 if (!(flags & ALT_SET_FLAGS))
 165                         return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
 166                 if (flags & ALT_FORM5)
 167                         return push_inst(compiler, SUBFC | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
 168                 return push_inst(compiler, SUBF | RC(flags) | D(dst) | A(src2) | B(src1));
 169
 170         case SLJIT_SUBC:
 171                 return push_inst(compiler, SUBFE | D(dst) | A(src2) | B(src1));
 172
 173         case SLJIT_MUL:
 174                 if (flags & ALT_FORM1) {
 175                         SLJIT_ASSERT(src2 == TMP_REG2);
 176                         return push_inst(compiler, MULLI | D(dst) | A(src1) | compiler->imm);
 177                 }
 178                 return push_inst(compiler, MULLW | OE(flags) | RC(flags) | D(dst) | A(src2) | B(src1));
 179
 180         case SLJIT_AND:
 181                 if (flags & ALT_FORM1) {
 182                         SLJIT_ASSERT(src2 == TMP_REG2);
 183                         return push_inst(compiler, ANDI | S(src1) | A(dst) | compiler->imm);
 184                 }
 185                 if (flags & ALT_FORM2) {
 186                         SLJIT_ASSERT(src2 == TMP_REG2);
 187                         return push_inst(compiler, ANDIS | S(src1) | A(dst) | compiler->imm);
 188                 }
 189                 return push_inst(compiler, AND | RC(flags) | S(src1) | A(dst) | B(src2));
 190
 191         case SLJIT_OR:
 192                 if (flags & ALT_FORM1) {
 193                         SLJIT_ASSERT(src2 == TMP_REG2);
 194                         return push_inst(compiler, ORI | S(src1) | A(dst) | compiler->imm);
 195                 }
 196                 if (flags & ALT_FORM2) {
 197                         SLJIT_ASSERT(src2 == TMP_REG2);
 198                         return push_inst(compiler, ORIS | S(src1) | A(dst) | compiler->imm);
 199                 }
 200                 if (flags & ALT_FORM3) {
 201                         SLJIT_ASSERT(src2 == TMP_REG2);
 202                         FAIL_IF(push_inst(compiler, ORI | S(src1) | A(dst) | IMM(compiler->imm)));
 203                         return push_inst(compiler, ORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
 204                 }
 205                 return push_inst(compiler, OR | RC(flags) | S(src1) | A(dst) | B(src2));
 206
 207         case SLJIT_XOR:
 208                 if (flags & ALT_FORM1) {
 209                         SLJIT_ASSERT(src2 == TMP_REG2);
 210                         return push_inst(compiler, XORI | S(src1) | A(dst) | compiler->imm);
 211                 }
 212                 if (flags & ALT_FORM2) {
 213                         SLJIT_ASSERT(src2 == TMP_REG2);
 214                         return push_inst(compiler, XORIS | S(src1) | A(dst) | compiler->imm);
 215                 }
 216                 if (flags & ALT_FORM3) {
 217                         SLJIT_ASSERT(src2 == TMP_REG2);
 218                         FAIL_IF(push_inst(compiler, XORI | S(src1) | A(dst) | IMM(compiler->imm)));
 219                         return push_inst(compiler, XORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
 220                 }
 221                 return push_inst(compiler, XOR | RC(flags) | S(src1) | A(dst) | B(src2));
 222
 223         case SLJIT_SHL:
 224                 if (flags & ALT_FORM1) {
 225                         SLJIT_ASSERT(src2 == TMP_REG2);
 226                         compiler->imm &= 0x1f;
 227                         return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11) | ((31 - compiler->imm) << 1));
 228                 }
 229                 return push_inst(compiler, SLW | RC(flags) | S(src1) | A(dst) | B(src2));
 230
 231         case SLJIT_LSHR:
 232                 if (flags & ALT_FORM1) {
 233                         SLJIT_ASSERT(src2 == TMP_REG2);
 234                         compiler->imm &= 0x1f;
 235                         return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (((32 - compiler->imm) & 0x1f) << 11) | (compiler->imm << 6) | (31 << 1));
 236                 }
 237                 return push_inst(compiler, SRW | RC(flags) | S(src1) | A(dst) | B(src2));
 238
 239         case SLJIT_ASHR:
 240                 if (flags & ALT_FORM1) {
 241                         SLJIT_ASSERT(src2 == TMP_REG2);
 242                         compiler->imm &= 0x1f;
 243                         return push_inst(compiler, SRAWI | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11));
 244                 }
 245                 return push_inst(compiler, SRAW | RC(flags) | S(src1) | A(dst) | B(src2));
 246         }
 247
 248         SLJIT_UNREACHABLE();
 249         return SLJIT_SUCCESS;
 250 }
 251
 252 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw init_value)
 253 {
 254         FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(init_value >> 16)));
 255         return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value));
 256 }
 257
 258 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
 259 {
 260         sljit_ins *inst = (sljit_ins *)addr;
 261
 262         inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 16) & 0xffff);
 263         inst[1] = (inst[1] & 0xffff0000) | (new_target & 0xffff);
 264         inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
 265         SLJIT_CACHE_FLUSH(inst, inst + 2);
 266 }
 267
 268 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
 269 {
 270         sljit_ins *inst = (sljit_ins *)addr;
 271
 272         inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
 273         inst[1] = (inst[1] & 0xffff0000) | (new_constant & 0xffff);
 274         inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
 275         SLJIT_CACHE_FLUSH(inst, inst + 2);
 276 }