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/*
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* Stack-less Just-In-Time compiler
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*
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* Copyright 2009-2012 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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/* x86 32-bit arch dependent functions. */
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static int emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_w imm)
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{
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sljit_ub *buf;
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buf = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_w));
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FAIL_IF(!buf);
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INC_SIZE(1 + sizeof(sljit_w));
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*buf++ = opcode;
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*(sljit_w*)buf = imm;
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return SLJIT_SUCCESS;
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}
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static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, int type)
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{
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if (type == SLJIT_JUMP) {
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*code_ptr++ = 0xe9;
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jump->addr++;
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}
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else if (type >= SLJIT_FAST_CALL) {
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*code_ptr++ = 0xe8;
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jump->addr++;
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}
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else {
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*code_ptr++ = 0x0f;
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*code_ptr++ = get_jump_code(type);
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jump->addr += 2;
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}
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if (jump->flags & JUMP_LABEL)
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jump->flags |= PATCH_MW;
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else
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*(sljit_w*)code_ptr = jump->u.target - (jump->addr + 4);
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code_ptr += 4;
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return code_ptr;
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}
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SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_enter(struct sljit_compiler *compiler, int args, int temporaries, int saveds, int local_size)
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{
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int size;
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sljit_ub *buf;
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CHECK_ERROR();
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check_sljit_emit_enter(compiler, args, temporaries, saveds, local_size);
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compiler->temporaries = temporaries;
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compiler->saveds = saveds;
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compiler->args = args;
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compiler->flags_saved = 0;
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#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
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size = 1 + (saveds <= 3 ? saveds : 3) + (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
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#else
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size = 1 + (saveds <= 3 ? saveds : 3) + (args > 0 ? (2 + args * 3) : 0);
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#endif
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buf = (sljit_ub*)ensure_buf(compiler, 1 + size);
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FAIL_IF(!buf);
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INC_SIZE(size);
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PUSH_REG(reg_map[TMP_REGISTER]);
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#if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
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if (args > 0) {
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*buf++ = 0x8b;
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*buf++ = 0xc4 | (reg_map[TMP_REGISTER] << 3);
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}
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#endif
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if (saveds > 2)
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PUSH_REG(reg_map[SLJIT_SAVED_REG3]);
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if (saveds > 1)
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PUSH_REG(reg_map[SLJIT_SAVED_REG2]);
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if (saveds > 0)
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PUSH_REG(reg_map[SLJIT_SAVED_REG1]);
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#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
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if (args > 0) {
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*buf++ = 0x8b;
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*buf++ = 0xc0 | (reg_map[SLJIT_SAVED_REG1] << 3) | reg_map[SLJIT_TEMPORARY_REG3];
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}
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if (args > 1) {
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*buf++ = 0x8b;
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*buf++ = 0xc0 | (reg_map[SLJIT_SAVED_REG2] << 3) | reg_map[SLJIT_TEMPORARY_REG2];
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}
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if (args > 2) {
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*buf++ = 0x8b;
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*buf++ = 0x44 | (reg_map[SLJIT_SAVED_REG3] << 3);
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*buf++ = 0x24;
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*buf++ = sizeof(sljit_w) * (3 + 2); /* saveds >= 3 as well. */
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}
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#else
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if (args > 0) {
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*buf++ = 0x8b;
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*buf++ = 0x40 | (reg_map[SLJIT_SAVED_REG1] << 3) | reg_map[TMP_REGISTER];
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*buf++ = sizeof(sljit_w) * 2;
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}
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if (args > 1) {
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*buf++ = 0x8b;
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*buf++ = 0x40 | (reg_map[SLJIT_SAVED_REG2] << 3) | reg_map[TMP_REGISTER];
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*buf++ = sizeof(sljit_w) * 3;
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}
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if (args > 2) {
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*buf++ = 0x8b;
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*buf++ = 0x40 | (reg_map[SLJIT_SAVED_REG3] << 3) | reg_map[TMP_REGISTER];
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*buf++ = sizeof(sljit_w) * 4;
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}
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#endif
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local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1);
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compiler->temporaries_start = local_size;
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if (temporaries > 3)
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local_size += (temporaries - 3) * sizeof(sljit_uw);
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compiler->saveds_start = local_size;
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if (saveds > 3)
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local_size += (saveds - 3) * sizeof(sljit_uw);
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#ifdef _WIN32
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if (local_size > 1024) {
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FAIL_IF(emit_do_imm(compiler, 0xb8 + reg_map[SLJIT_TEMPORARY_REG1], local_size));
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FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_touch_stack)));
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}
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#endif
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compiler->local_size = local_size;
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if (local_size > 0)
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return emit_non_cum_binary(compiler, 0x2b, 0x29, 0x5 << 3, 0x2d,
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SLJIT_LOCALS_REG, 0, SLJIT_LOCALS_REG, 0, SLJIT_IMM, local_size);
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return SLJIT_SUCCESS;
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}
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SLJIT_API_FUNC_ATTRIBUTE void sljit_set_context(struct sljit_compiler *compiler, int args, int temporaries, int saveds, int local_size)
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{
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CHECK_ERROR_VOID();
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check_sljit_set_context(compiler, args, temporaries, saveds, local_size);
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compiler->temporaries = temporaries;
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compiler->saveds = saveds;
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compiler->args = args;
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compiler->local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1);
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compiler->temporaries_start = compiler->local_size;
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if (temporaries > 3)
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compiler->local_size += (temporaries - 3) * sizeof(sljit_uw);
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compiler->saveds_start = compiler->local_size;
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if (saveds > 3)
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compiler->local_size += (saveds - 3) * sizeof(sljit_uw);
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}
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SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_return(struct sljit_compiler *compiler, int op, int src, sljit_w srcw)
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{
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int size;
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sljit_ub *buf;
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CHECK_ERROR();
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check_sljit_emit_return(compiler, op, src, srcw);
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SLJIT_ASSERT(compiler->args >= 0);
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compiler->flags_saved = 0;
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FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
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if (compiler->local_size > 0)
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FAIL_IF(emit_cum_binary(compiler, 0x03, 0x01, 0x0 << 3, 0x05,
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SLJIT_LOCALS_REG, 0, SLJIT_LOCALS_REG, 0, SLJIT_IMM, compiler->local_size));
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size = 2 + (compiler->saveds <= 3 ? compiler->saveds : 3);
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#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
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if (compiler->args > 2)
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size += 2;
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#else
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if (compiler->args > 0)
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size += 2;
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#endif
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buf = (sljit_ub*)ensure_buf(compiler, 1 + size);
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FAIL_IF(!buf);
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INC_SIZE(size);
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if (compiler->saveds > 0)
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POP_REG(reg_map[SLJIT_SAVED_REG1]);
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if (compiler->saveds > 1)
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POP_REG(reg_map[SLJIT_SAVED_REG2]);
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if (compiler->saveds > 2)
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POP_REG(reg_map[SLJIT_SAVED_REG3]);
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POP_REG(reg_map[TMP_REGISTER]);
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#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
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if (compiler->args > 2)
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RETN(sizeof(sljit_w));
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else
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RET();
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#else
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if (compiler->args > 0)
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RETN(compiler->args * sizeof(sljit_w));
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else
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RET();
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#endif
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return SLJIT_SUCCESS;
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}
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/* --------------------------------------------------------------------- */
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/* Operators */
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/* --------------------------------------------------------------------- */
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/* Size contains the flags as well. */
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static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, int size,
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/* The register or immediate operand. */
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int a, sljit_w imma,
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/* The general operand (not immediate). */
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int b, sljit_w immb)
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{
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sljit_ub *buf;
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sljit_ub *buf_ptr;
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int flags = size & ~0xf;
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int inst_size;
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/* Both cannot be switched on. */
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SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
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/* Size flags not allowed for typed instructions. */
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SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
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/* Both size flags cannot be switched on. */
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SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
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#if (defined SLJIT_SSE2 && SLJIT_SSE2)
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/* SSE2 and immediate is not possible. */
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SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
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#endif
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size &= 0xf;
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inst_size = size;
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#if (defined SLJIT_SSE2 && SLJIT_SSE2)
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if (flags & EX86_PREF_F2)
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inst_size++;
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#endif
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if (flags & EX86_PREF_66)
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inst_size++;
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/* Calculate size of b. */
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inst_size += 1; /* mod r/m byte. */
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if (b & SLJIT_MEM) {
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if ((b & 0x0f) == SLJIT_UNUSED)
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inst_size += sizeof(sljit_w);
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else if (immb != 0 && !(b & 0xf0)) {
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/* Immediate operand. */
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if (immb <= 127 && immb >= -128)
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inst_size += sizeof(sljit_b);
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else
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inst_size += sizeof(sljit_w);
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}
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if ((b & 0xf) == SLJIT_LOCALS_REG && !(b & 0xf0))
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b |= SLJIT_LOCALS_REG << 4;
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if ((b & 0xf0) != SLJIT_UNUSED)
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inst_size += 1; /* SIB byte. */
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}
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/* Calculate size of a. */
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if (a & SLJIT_IMM) {
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if (flags & EX86_BIN_INS) {
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if (imma <= 127 && imma >= -128) {
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inst_size += 1;
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flags |= EX86_BYTE_ARG;
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} else
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inst_size += 4;
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}
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else if (flags & EX86_SHIFT_INS) {
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imma &= 0x1f;
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if (imma != 1) {
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inst_size ++;
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flags |= EX86_BYTE_ARG;
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}
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} else if (flags & EX86_BYTE_ARG)
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inst_size++;
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else if (flags & EX86_HALF_ARG)
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inst_size += sizeof(short);
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else
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inst_size += sizeof(sljit_w);
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}
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else
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| 306 |
SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
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buf = (sljit_ub*)ensure_buf(compiler, 1 + inst_size);
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| 309 |
PTR_FAIL_IF(!buf);
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| 310 |
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| 311 |
/* Encoding the byte. */
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| 312 |
INC_SIZE(inst_size);
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| 313 |
#if (defined SLJIT_SSE2 && SLJIT_SSE2)
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| 314 |
if (flags & EX86_PREF_F2)
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| 315 |
*buf++ = 0xf2;
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| 316 |
#endif
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| 317 |
if (flags & EX86_PREF_66)
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| 318 |
*buf++ = 0x66;
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| 319 |
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buf_ptr = buf + size;
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| 321 |
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| 322 |
/* Encode mod/rm byte. */
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| 323 |
if (!(flags & EX86_SHIFT_INS)) {
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| 324 |
if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
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| 325 |
*buf = (flags & EX86_BYTE_ARG) ? 0x83 : 0x81;
|
| 326 |
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| 327 |
if ((a & SLJIT_IMM) || (a == 0))
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| 328 |
*buf_ptr = 0;
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| 329 |
#if (defined SLJIT_SSE2 && SLJIT_SSE2)
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| 330 |
else if (!(flags & EX86_SSE2))
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| 331 |
*buf_ptr = reg_map[a] << 3;
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| 332 |
else
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| 333 |
*buf_ptr = a << 3;
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| 334 |
#else
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| 335 |
else
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| 336 |
*buf_ptr = reg_map[a] << 3;
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| 337 |
#endif
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| 338 |
}
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| 339 |
else {
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| 340 |
if (a & SLJIT_IMM) {
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| 341 |
if (imma == 1)
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| 342 |
*buf = 0xd1;
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| 343 |
else
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| 344 |
*buf = 0xc1;
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| 345 |
} else
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| 346 |
*buf = 0xd3;
|
| 347 |
*buf_ptr = 0;
|
| 348 |
}
|
| 349 |
|
| 350 |
if (!(b & SLJIT_MEM))
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| 351 |
#if (defined SLJIT_SSE2 && SLJIT_SSE2)
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| 352 |
*buf_ptr++ |= 0xc0 + ((!(flags & EX86_SSE2)) ? reg_map[b] : b);
|
| 353 |
#else
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| 354 |
*buf_ptr++ |= 0xc0 + reg_map[b];
|
| 355 |
#endif
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| 356 |
else if ((b & 0x0f) != SLJIT_UNUSED) {
|
| 357 |
if ((b & 0xf0) == SLJIT_UNUSED || (b & 0xf0) == (SLJIT_LOCALS_REG << 4)) {
|
| 358 |
if (immb != 0) {
|
| 359 |
if (immb <= 127 && immb >= -128)
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| 360 |
*buf_ptr |= 0x40;
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| 361 |
else
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| 362 |
*buf_ptr |= 0x80;
|
| 363 |
}
|
| 364 |
|
| 365 |
if ((b & 0xf0) == SLJIT_UNUSED)
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| 366 |
*buf_ptr++ |= reg_map[b & 0x0f];
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| 367 |
else {
|
| 368 |
*buf_ptr++ |= 0x04;
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| 369 |
*buf_ptr++ = reg_map[b & 0x0f] | (reg_map[(b >> 4) & 0x0f] << 3);
|
| 370 |
}
|
| 371 |
|
| 372 |
if (immb != 0) {
|
| 373 |
if (immb <= 127 && immb >= -128)
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| 374 |
*buf_ptr++ = immb; /* 8 bit displacement. */
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| 375 |
else {
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| 376 |
*(sljit_w*)buf_ptr = immb; /* 32 bit displacement. */
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| 377 |
buf_ptr += sizeof(sljit_w);
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| 378 |
}
|
| 379 |
}
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| 380 |
}
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| 381 |
else {
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| 382 |
*buf_ptr++ |= 0x04;
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| 383 |
*buf_ptr++ = reg_map[b & 0x0f] | (reg_map[(b >> 4) & 0x0f] << 3) | (immb << 6);
|
| 384 |
}
|
| 385 |
}
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| 386 |
else {
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| 387 |
*buf_ptr++ |= 0x05;
|
| 388 |
*(sljit_w*)buf_ptr = immb; /* 32 bit displacement. */
|
| 389 |
buf_ptr += sizeof(sljit_w);
|
| 390 |
}
|
| 391 |
|
| 392 |
if (a & SLJIT_IMM) {
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| 393 |
if (flags & EX86_BYTE_ARG)
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| 394 |
*buf_ptr = imma;
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| 395 |
else if (flags & EX86_HALF_ARG)
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| 396 |
*(short*)buf_ptr = imma;
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| 397 |
else if (!(flags & EX86_SHIFT_INS))
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| 398 |
*(sljit_w*)buf_ptr = imma;
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| 399 |
}
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| 400 |
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| 401 |
return !(flags & EX86_SHIFT_INS) ? buf : (buf + 1);
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| 402 |
}
|
| 403 |
|
| 404 |
/* --------------------------------------------------------------------- */
|
| 405 |
/* Call / return instructions */
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| 406 |
/* --------------------------------------------------------------------- */
|
| 407 |
|
| 408 |
static SLJIT_INLINE int call_with_args(struct sljit_compiler *compiler, int type)
|
| 409 |
{
|
| 410 |
sljit_ub *buf;
|
| 411 |
|
| 412 |
#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
|
| 413 |
buf = (sljit_ub*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2);
|
| 414 |
FAIL_IF(!buf);
|
| 415 |
INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2);
|
| 416 |
|
| 417 |
if (type >= SLJIT_CALL3)
|
| 418 |
PUSH_REG(reg_map[SLJIT_TEMPORARY_REG3]);
|
| 419 |
*buf++ = 0x8b;
|
| 420 |
*buf++ = 0xc0 | (reg_map[SLJIT_TEMPORARY_REG3] << 3) | reg_map[SLJIT_TEMPORARY_REG1];
|
| 421 |
#else
|
| 422 |
buf = (sljit_ub*)ensure_buf(compiler, type - SLJIT_CALL0 + 1);
|
| 423 |
FAIL_IF(!buf);
|
| 424 |
INC_SIZE(type - SLJIT_CALL0);
|
| 425 |
if (type >= SLJIT_CALL3)
|
| 426 |
PUSH_REG(reg_map[SLJIT_TEMPORARY_REG3]);
|
| 427 |
if (type >= SLJIT_CALL2)
|
| 428 |
PUSH_REG(reg_map[SLJIT_TEMPORARY_REG2]);
|
| 429 |
PUSH_REG(reg_map[SLJIT_TEMPORARY_REG1]);
|
| 430 |
#endif
|
| 431 |
return SLJIT_SUCCESS;
|
| 432 |
}
|
| 433 |
|
| 434 |
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_enter(struct sljit_compiler *compiler, int dst, sljit_w dstw, int args, int temporaries, int saveds, int local_size)
|
| 435 |
{
|
| 436 |
sljit_ub *buf;
|
| 437 |
|
| 438 |
CHECK_ERROR();
|
| 439 |
check_sljit_emit_fast_enter(compiler, dst, dstw, args, temporaries, saveds, local_size);
|
| 440 |
|
| 441 |
compiler->temporaries = temporaries;
|
| 442 |
compiler->saveds = saveds;
|
| 443 |
compiler->args = args;
|
| 444 |
compiler->local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1);
|
| 445 |
compiler->temporaries_start = compiler->local_size;
|
| 446 |
if (temporaries > 3)
|
| 447 |
compiler->local_size += (temporaries - 3) * sizeof(sljit_uw);
|
| 448 |
compiler->saveds_start = compiler->local_size;
|
| 449 |
if (saveds > 3)
|
| 450 |
compiler->local_size += (saveds - 3) * sizeof(sljit_uw);
|
| 451 |
|
| 452 |
CHECK_EXTRA_REGS(dst, dstw, (void)0);
|
| 453 |
|
| 454 |
if (dst >= SLJIT_TEMPORARY_REG1 && dst <= SLJIT_NO_REGISTERS) {
|
| 455 |
buf = (sljit_ub*)ensure_buf(compiler, 1 + 1);
|
| 456 |
FAIL_IF(!buf);
|
| 457 |
|
| 458 |
INC_SIZE(1);
|
| 459 |
POP_REG(reg_map[dst]);
|
| 460 |
return SLJIT_SUCCESS;
|
| 461 |
}
|
| 462 |
else if (dst & SLJIT_MEM) {
|
| 463 |
buf = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
|
| 464 |
FAIL_IF(!buf);
|
| 465 |
*buf++ = 0x8f;
|
| 466 |
return SLJIT_SUCCESS;
|
| 467 |
}
|
| 468 |
|
| 469 |
/* For UNUSED dst. Uncommon, but possible. */
|
| 470 |
buf = (sljit_ub*)ensure_buf(compiler, 1 + 1);
|
| 471 |
FAIL_IF(!buf);
|
| 472 |
|
| 473 |
INC_SIZE(1);
|
| 474 |
POP_REG(reg_map[TMP_REGISTER]);
|
| 475 |
return SLJIT_SUCCESS;
|
| 476 |
}
|
| 477 |
|
| 478 |
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_return(struct sljit_compiler *compiler, int src, sljit_w srcw)
|
| 479 |
{
|
| 480 |
sljit_ub *buf;
|
| 481 |
|
| 482 |
CHECK_ERROR();
|
| 483 |
check_sljit_emit_fast_return(compiler, src, srcw);
|
| 484 |
|
| 485 |
CHECK_EXTRA_REGS(src, srcw, (void)0);
|
| 486 |
|
| 487 |
if (src >= SLJIT_TEMPORARY_REG1 && src <= SLJIT_NO_REGISTERS) {
|
| 488 |
buf = (sljit_ub*)ensure_buf(compiler, 1 + 1 + 1);
|
| 489 |
FAIL_IF(!buf);
|
| 490 |
|
| 491 |
INC_SIZE(1 + 1);
|
| 492 |
PUSH_REG(reg_map[src]);
|
| 493 |
}
|
| 494 |
else if (src & SLJIT_MEM) {
|
| 495 |
buf = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
|
| 496 |
FAIL_IF(!buf);
|
| 497 |
*buf++ = 0xff;
|
| 498 |
*buf |= 6 << 3;
|
| 499 |
|
| 500 |
buf = (sljit_ub*)ensure_buf(compiler, 1 + 1);
|
| 501 |
FAIL_IF(!buf);
|
| 502 |
INC_SIZE(1);
|
| 503 |
}
|
| 504 |
else {
|
| 505 |
/* SLJIT_IMM. */
|
| 506 |
buf = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1);
|
| 507 |
FAIL_IF(!buf);
|
| 508 |
|
| 509 |
INC_SIZE(5 + 1);
|
| 510 |
*buf++ = 0x68;
|
| 511 |
*(sljit_w*)buf = srcw;
|
| 512 |
buf += sizeof(sljit_w);
|
| 513 |
}
|
| 514 |
|
| 515 |
RET();
|
| 516 |
return SLJIT_SUCCESS;
|
| 517 |
}
|
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