6191b05901
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4477 c046a42c-6fe2-441c-8c8c-71466251a162
218 lines
4.5 KiB
C
218 lines
4.5 KiB
C
/*
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* i386 micro operations (included several times to generate
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* different operand sizes)
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define DATA_BITS (1 << (3 + SHIFT))
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#define SHIFT_MASK (DATA_BITS - 1)
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#define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1))
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#if DATA_BITS <= 32
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#define SHIFT1_MASK 0x1f
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#else
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#define SHIFT1_MASK 0x3f
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#endif
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#if DATA_BITS == 8
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#define SUFFIX b
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#define DATA_TYPE uint8_t
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#define DATA_STYPE int8_t
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#define DATA_MASK 0xff
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#elif DATA_BITS == 16
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#define SUFFIX w
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#define DATA_TYPE uint16_t
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#define DATA_STYPE int16_t
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#define DATA_MASK 0xffff
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#elif DATA_BITS == 32
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#define SUFFIX l
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#define DATA_TYPE uint32_t
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#define DATA_STYPE int32_t
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#define DATA_MASK 0xffffffff
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#elif DATA_BITS == 64
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#define SUFFIX q
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#define DATA_TYPE uint64_t
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#define DATA_STYPE int64_t
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#define DATA_MASK 0xffffffffffffffffULL
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#else
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#error unhandled operand size
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#endif
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/* various optimized jumps cases */
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void OPPROTO glue(op_jb_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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if ((DATA_TYPE)src1 < (DATA_TYPE)src2)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jz_sub, SUFFIX)(void)
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{
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if ((DATA_TYPE)CC_DST == 0)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jnz_sub, SUFFIX)(void)
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{
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if ((DATA_TYPE)CC_DST != 0)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jbe_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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if ((DATA_TYPE)src1 <= (DATA_TYPE)src2)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_js_sub, SUFFIX)(void)
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{
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if (CC_DST & SIGN_MASK)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jl_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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if ((DATA_STYPE)src1 < (DATA_STYPE)src2)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jle_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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if ((DATA_STYPE)src1 <= (DATA_STYPE)src2)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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/* oldies */
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#if DATA_BITS >= 16
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void OPPROTO glue(op_loopnz, SUFFIX)(void)
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{
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if ((DATA_TYPE)ECX != 0 && !(T0 & CC_Z))
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_loopz, SUFFIX)(void)
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{
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if ((DATA_TYPE)ECX != 0 && (T0 & CC_Z))
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jz_ecx, SUFFIX)(void)
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{
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if ((DATA_TYPE)ECX == 0)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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void OPPROTO glue(op_jnz_ecx, SUFFIX)(void)
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{
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if ((DATA_TYPE)ECX != 0)
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GOTO_LABEL_PARAM(1);
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FORCE_RET();
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}
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#endif
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/* various optimized set cases */
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void OPPROTO glue(op_setb_T0_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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T0 = ((DATA_TYPE)src1 < (DATA_TYPE)src2);
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}
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void OPPROTO glue(op_setz_T0_sub, SUFFIX)(void)
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{
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T0 = ((DATA_TYPE)CC_DST == 0);
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}
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void OPPROTO glue(op_setbe_T0_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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T0 = ((DATA_TYPE)src1 <= (DATA_TYPE)src2);
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}
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void OPPROTO glue(op_sets_T0_sub, SUFFIX)(void)
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{
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T0 = lshift(CC_DST, -(DATA_BITS - 1)) & 1;
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}
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void OPPROTO glue(op_setl_T0_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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T0 = ((DATA_STYPE)src1 < (DATA_STYPE)src2);
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}
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void OPPROTO glue(op_setle_T0_sub, SUFFIX)(void)
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{
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target_long src1, src2;
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src1 = CC_DST + CC_SRC;
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src2 = CC_SRC;
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T0 = ((DATA_STYPE)src1 <= (DATA_STYPE)src2);
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}
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/* string operations */
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void OPPROTO glue(op_movl_T0_Dshift, SUFFIX)(void)
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{
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T0 = DF << SHIFT;
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}
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#undef DATA_BITS
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#undef SHIFT_MASK
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#undef SHIFT1_MASK
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#undef SIGN_MASK
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#undef DATA_TYPE
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#undef DATA_STYPE
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#undef DATA_MASK
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#undef SUFFIX
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