73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*
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* Stack-less Just-In-Time compiler
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*
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* Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_r, sljit_sw imm, sljit_s32 tmp_r)
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{
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SLJIT_UNUSED_ARG(tmp_r);
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if (imm <= SIMM_MAX && imm >= SIMM_MIN)
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return push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm));
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if (imm & 0x800)
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imm += 0x1000;
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FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));
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if ((imm & 0xfff) == 0)
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return SLJIT_SUCCESS;
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return push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
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}
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static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value, sljit_ins last_ins)
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{
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if ((init_value & 0x800) != 0)
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init_value += 0x1000;
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FAIL_IF(push_inst(compiler, LUI | RD(dst) | (sljit_ins)(init_value & ~0xfff)));
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return push_inst(compiler, last_ins | RS1(dst) | IMM_I(init_value));
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}
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SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
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{
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sljit_ins *inst = (sljit_ins*)addr;
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SLJIT_UNUSED_ARG(executable_offset);
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if ((new_target & 0x800) != 0)
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new_target += 0x1000;
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SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 0);
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SLJIT_ASSERT((inst[0] & 0x7f) == LUI);
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inst[0] = (inst[0] & 0xfff) | (sljit_ins)((sljit_sw)new_target & ~0xfff);
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SLJIT_ASSERT((inst[1] & 0x707f) == ADDI || (inst[1] & 0x707f) == JALR);
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inst[1] = (inst[1] & 0xfffff) | IMM_I(new_target);
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SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 1);
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inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
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SLJIT_CACHE_FLUSH(inst, inst + 5);
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}
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