sljit_src/sljitNativeRISCV_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 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_r, sljit_sw imm, sljit_s32 tmp_r)
  28 {
  29         SLJIT_UNUSED_ARG(tmp_r);
  30
  31         if (imm <= SIMM_MAX && imm >= SIMM_MIN)
  32                 return push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm));
  33
  34         if (imm & 0x800)
  35                 imm += 0x1000;
  36
  37         FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));
  38
  39         if ((imm & 0xfff) == 0)
  40                 return SLJIT_SUCCESS;
  41
  42         return push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
  43 }
  44
  45 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value, sljit_ins last_ins)
  46 {
  47         if ((init_value & 0x800) != 0)
  48                 init_value += 0x1000;
  49
  50         FAIL_IF(push_inst(compiler, LUI | RD(dst) | (sljit_ins)(init_value & ~0xfff)));
  51         return push_inst(compiler, last_ins | RS1(dst) | IMM_I(init_value));
  52 }
  53
  54 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
  55 {
  56         sljit_ins *inst = (sljit_ins*)addr;
  57         SLJIT_UNUSED_ARG(executable_offset);
  58
  59         if ((new_target & 0x800) != 0)
  60                 new_target += 0x1000;
  61
  62         SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 0);
  63
  64         SLJIT_ASSERT((inst[0] & 0x7f) == LUI);
  65         inst[0] = (inst[0] & 0xfff) | (sljit_ins)((sljit_sw)new_target & ~0xfff);
  66         SLJIT_ASSERT((inst[1] & 0x707f) == ADDI || (inst[1] & 0x707f) == JALR);
  67         inst[1] = (inst[1] & 0xfffff) | IMM_I(new_target);
  68
  69         SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 1);
  70         inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
  71         SLJIT_CACHE_FLUSH(inst, inst + 5);
  72 }