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#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <orc/orcprogram.h>
#include <orc/x86.h>
#define SIZE 65536
/* rules */
static void
x86_rule_loadi_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
x86_emit_mov_imm_reg (p, 2, p->vars[insn->args[2]].s16,
p->vars[insn->args[0]].alloc);
}
static void
x86_rule_add_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
if (insn->rule_flag == ORC_RULE_REG_IMM) {
int value = p->vars[insn->args[2]].s16;
printf(" addw $%d, %%%s\n", value,
x86_get_regname_16(p->vars[insn->args[0]].alloc));
if (value >= -128 && value < 128) {
*p->codeptr++ = 0x66;
*p->codeptr++ = 0x83;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 0);
*p->codeptr++ = value;
} else {
*p->codeptr++ = 0x66;
*p->codeptr++ = 0x81;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 0);
*p->codeptr++ = value & 0xff;
*p->codeptr++ = value >> 8;
}
} else {
printf(" addw %%%s, %%%s\n",
x86_get_regname_16(p->vars[insn->args[2]].alloc),
x86_get_regname_16(p->vars[insn->args[0]].alloc));
*p->codeptr++ = 0x66;
*p->codeptr++ = 0x03;
x86_emit_modrm_reg (p, p->vars[insn->args[2]].alloc,
p->vars[insn->args[0]].alloc);
}
}
static void
x86_rule_sub_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
printf(" subw %%%s, %%%s\n",
x86_get_regname_16(p->vars[insn->args[2]].alloc),
x86_get_regname_16(p->vars[insn->args[0]].alloc));
*p->codeptr++ = 0x66;
*p->codeptr++ = 0x2b;
x86_emit_modrm_reg (p, p->vars[insn->args[2]].alloc,
p->vars[insn->args[0]].alloc);
}
static void
x86_rule_mul_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
printf(" imulw %%%s, %%%s\n",
x86_get_regname_16(p->vars[insn->args[2]].alloc),
x86_get_regname_16(p->vars[insn->args[0]].alloc));
*p->codeptr++ = 0x66;
*p->codeptr++ = 0x0f;
*p->codeptr++ = 0xaf;
x86_emit_modrm_reg (p, p->vars[insn->args[2]].alloc,
p->vars[insn->args[0]].alloc);
}
static void
x86_rule_lshift_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
x86_emit_mov_reg_reg(p, 4, p->vars[insn->args[2]].alloc, X86_ECX);
printf(" shlw %%cl, %%%s\n",
x86_get_regname_16(p->vars[insn->args[0]].alloc));
*p->codeptr++ = 0x66;
*p->codeptr++ = 0xd3;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 4);
}
static void
x86_rule_rshift_s16 (OrcProgram *p, void *user, OrcInstruction *insn)
{
if (insn->rule_flag == ORC_RULE_REG_IMM) {
printf(" sarw $%d, %%%s\n",
p->vars[insn->args[2]].s16,
x86_get_regname_16(p->vars[insn->args[0]].alloc));
if (p->vars[insn->args[2]].s16 == 1) {
*p->codeptr++ = 0x66;
*p->codeptr++ = 0xd1;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 7);
} else {
*p->codeptr++ = 0x66;
*p->codeptr++ = 0xc1;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 7);
*p->codeptr++ = p->vars[insn->args[2]].s16;
}
} else {
x86_emit_mov_reg_reg(p, 4, p->vars[insn->args[2]].alloc, X86_ECX);
printf(" sarw %%cl, %%%s\n",
x86_get_regname_16(p->vars[insn->args[0]].alloc));
*p->codeptr++ = 0x66;
*p->codeptr++ = 0xd3;
x86_emit_modrm_reg (p, p->vars[insn->args[0]].alloc, 7);
}
}
void
orc_program_x86_register_rules (void)
{
orc_rule_register ("_loadi_s16", ORC_RULE_SCALAR_1, x86_rule_loadi_s16, NULL,
ORC_RULE_REG_IMM);
orc_rule_register ("add_s16", ORC_RULE_SCALAR_1, x86_rule_add_s16, NULL,
ORC_RULE_REG_REG | ORC_RULE_REG_IMM);
orc_rule_register ("sub_s16", ORC_RULE_SCALAR_1, x86_rule_sub_s16, NULL,
ORC_RULE_REG_REG);
orc_rule_register ("mul_s16", ORC_RULE_SCALAR_1, x86_rule_mul_s16, NULL,
ORC_RULE_REG_REG);
orc_rule_register ("lshift_s16", ORC_RULE_SCALAR_1, x86_rule_lshift_s16, NULL,
ORC_RULE_REG_REG);
orc_rule_register ("rshift_s16", ORC_RULE_SCALAR_1, x86_rule_rshift_s16, NULL,
ORC_RULE_REG_REG | ORC_RULE_REG_IMM);
}
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