314 lines
9.5 KiB
C
314 lines
9.5 KiB
C
/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001-2012 The Bochs Project
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// Copyright (C) 2017 Google Inc.
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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., 51 Franklin St, Fifth Floor, Boston, MA B 02110-1301 USA
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/////////////////////////////////////////////////////////////////////////
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/*
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* flags functions
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "panic.h"
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#include "cpu.h"
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#include "x86_flags.h"
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#include "x86.h"
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/* this is basically bocsh code */
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#define LF_SIGN_BIT 31
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#define LF_BIT_SD (0) /* lazy Sign Flag Delta */
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#define LF_BIT_AF (3) /* lazy Adjust flag */
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#define LF_BIT_PDB (8) /* lazy Parity Delta Byte (8 bits) */
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#define LF_BIT_CF (31) /* lazy Carry Flag */
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#define LF_BIT_PO (30) /* lazy Partial Overflow = CF ^ OF */
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#define LF_MASK_SD (0x01 << LF_BIT_SD)
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#define LF_MASK_AF (0x01 << LF_BIT_AF)
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#define LF_MASK_PDB (0xFF << LF_BIT_PDB)
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#define LF_MASK_CF (0x01 << LF_BIT_CF)
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#define LF_MASK_PO (0x01 << LF_BIT_PO)
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#define ADD_COUT_VEC(op1, op2, result) \
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(((op1) & (op2)) | (((op1) | (op2)) & (~(result))))
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#define SUB_COUT_VEC(op1, op2, result) \
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(((~(op1)) & (op2)) | (((~(op1)) ^ (op2)) & (result)))
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#define GET_ADD_OVERFLOW(op1, op2, result, mask) \
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((((op1) ^ (result)) & ((op2) ^ (result))) & (mask))
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/* ******************* */
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/* OSZAPC */
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/* ******************* */
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/* size, carries, result */
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#define SET_FLAGS_OSZAPC_SIZE(size, lf_carries, lf_result) { \
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target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
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(((lf_carries) >> (size - 2)) << LF_BIT_PO); \
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env->hvf_lflags.result = (target_ulong)(int##size##_t)(lf_result); \
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if ((size) == 32) { \
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temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
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} else if ((size) == 16) { \
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temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
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} else if ((size) == 8) { \
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temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
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} else { \
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VM_PANIC("unimplemented"); \
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} \
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env->hvf_lflags.auxbits = (target_ulong)(uint32_t)temp; \
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}
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/* carries, result */
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#define SET_FLAGS_OSZAPC_8(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(8, carries, result)
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#define SET_FLAGS_OSZAPC_16(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(16, carries, result)
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#define SET_FLAGS_OSZAPC_32(carries, result) \
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SET_FLAGS_OSZAPC_SIZE(32, carries, result)
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/* ******************* */
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/* OSZAP */
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/* ******************* */
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/* size, carries, result */
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#define SET_FLAGS_OSZAP_SIZE(size, lf_carries, lf_result) { \
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target_ulong temp = ((lf_carries) & (LF_MASK_AF)) | \
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(((lf_carries) >> (size - 2)) << LF_BIT_PO); \
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if ((size) == 32) { \
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temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
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} else if ((size) == 16) { \
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temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
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} else if ((size) == 8) { \
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temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
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} else { \
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VM_PANIC("unimplemented"); \
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} \
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env->hvf_lflags.result = (target_ulong)(int##size##_t)(lf_result); \
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target_ulong delta_c = (env->hvf_lflags.auxbits ^ temp) & LF_MASK_CF; \
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delta_c ^= (delta_c >> 1); \
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env->hvf_lflags.auxbits = (target_ulong)(uint32_t)(temp ^ delta_c); \
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}
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/* carries, result */
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#define SET_FLAGS_OSZAP_8(carries, result) \
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SET_FLAGS_OSZAP_SIZE(8, carries, result)
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#define SET_FLAGS_OSZAP_16(carries, result) \
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SET_FLAGS_OSZAP_SIZE(16, carries, result)
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#define SET_FLAGS_OSZAP_32(carries, result) \
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SET_FLAGS_OSZAP_SIZE(32, carries, result)
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void SET_FLAGS_OxxxxC(CPUX86State *env, uint32_t new_of, uint32_t new_cf)
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{
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uint32_t temp_po = new_of ^ new_cf;
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env->hvf_lflags.auxbits &= ~(LF_MASK_PO | LF_MASK_CF);
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env->hvf_lflags.auxbits |= (temp_po << LF_BIT_PO) | (new_cf << LF_BIT_CF);
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}
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void SET_FLAGS_OSZAPC_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
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uint32_t diff)
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{
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SET_FLAGS_OSZAPC_32(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
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uint16_t diff)
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{
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SET_FLAGS_OSZAPC_16(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
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uint8_t diff)
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{
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SET_FLAGS_OSZAPC_8(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
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uint32_t diff)
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{
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SET_FLAGS_OSZAPC_32(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
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uint16_t diff)
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{
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SET_FLAGS_OSZAPC_16(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
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uint8_t diff)
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{
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SET_FLAGS_OSZAPC_8(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
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uint32_t diff)
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{
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SET_FLAGS_OSZAP_32(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
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uint16_t diff)
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{
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SET_FLAGS_OSZAP_16(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
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uint8_t diff)
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{
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SET_FLAGS_OSZAP_8(SUB_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
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uint32_t diff)
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{
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SET_FLAGS_OSZAP_32(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
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uint16_t diff)
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{
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SET_FLAGS_OSZAP_16(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAP_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
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uint8_t diff)
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{
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SET_FLAGS_OSZAP_8(ADD_COUT_VEC(v1, v2, diff), diff);
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}
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void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t v1, uint32_t v2,
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uint32_t diff)
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{
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SET_FLAGS_OSZAPC_32(0, diff);
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}
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void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t v1, uint16_t v2,
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uint16_t diff)
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{
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SET_FLAGS_OSZAPC_16(0, diff);
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}
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void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t v1, uint8_t v2,
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uint8_t diff)
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{
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SET_FLAGS_OSZAPC_8(0, diff);
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}
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bool get_PF(CPUX86State *env)
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{
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uint32_t temp = (255 & env->hvf_lflags.result);
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temp = temp ^ (255 & (env->hvf_lflags.auxbits >> LF_BIT_PDB));
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temp = (temp ^ (temp >> 4)) & 0x0F;
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return (0x9669U >> temp) & 1;
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}
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void set_PF(CPUX86State *env, bool val)
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{
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uint32_t temp = (255 & env->hvf_lflags.result) ^ (!val);
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env->hvf_lflags.auxbits &= ~(LF_MASK_PDB);
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env->hvf_lflags.auxbits |= (temp << LF_BIT_PDB);
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}
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bool get_OF(CPUX86State *env)
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{
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return ((env->hvf_lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
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}
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bool get_CF(CPUX86State *env)
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{
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return (env->hvf_lflags.auxbits >> LF_BIT_CF) & 1;
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}
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void set_OF(CPUX86State *env, bool val)
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{
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bool old_cf = get_CF(env);
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SET_FLAGS_OxxxxC(env, val, old_cf);
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}
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void set_CF(CPUX86State *env, bool val)
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{
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bool old_of = get_OF(env);
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SET_FLAGS_OxxxxC(env, old_of, val);
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}
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bool get_AF(CPUX86State *env)
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{
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return (env->hvf_lflags.auxbits >> LF_BIT_AF) & 1;
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}
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void set_AF(CPUX86State *env, bool val)
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{
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env->hvf_lflags.auxbits &= ~(LF_MASK_AF);
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env->hvf_lflags.auxbits |= val << LF_BIT_AF;
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}
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bool get_ZF(CPUX86State *env)
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{
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return !env->hvf_lflags.result;
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}
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void set_ZF(CPUX86State *env, bool val)
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{
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if (val) {
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env->hvf_lflags.auxbits ^=
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(((env->hvf_lflags.result >> LF_SIGN_BIT) & 1) << LF_BIT_SD);
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/* merge the parity bits into the Parity Delta Byte */
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uint32_t temp_pdb = (255 & env->hvf_lflags.result);
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env->hvf_lflags.auxbits ^= (temp_pdb << LF_BIT_PDB);
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/* now zero the .result value */
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env->hvf_lflags.result = 0;
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} else {
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env->hvf_lflags.result |= (1 << 8);
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}
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}
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bool get_SF(CPUX86State *env)
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{
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return ((env->hvf_lflags.result >> LF_SIGN_BIT) ^
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(env->hvf_lflags.auxbits >> LF_BIT_SD)) & 1;
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}
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void set_SF(CPUX86State *env, bool val)
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{
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bool temp_sf = get_SF(env);
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env->hvf_lflags.auxbits ^= (temp_sf ^ val) << LF_BIT_SD;
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}
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void lflags_to_rflags(CPUX86State *env)
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{
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env->eflags |= get_CF(env) ? CC_C : 0;
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env->eflags |= get_PF(env) ? CC_P : 0;
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env->eflags |= get_AF(env) ? CC_A : 0;
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env->eflags |= get_ZF(env) ? CC_Z : 0;
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env->eflags |= get_SF(env) ? CC_S : 0;
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env->eflags |= get_OF(env) ? CC_O : 0;
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}
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void rflags_to_lflags(CPUX86State *env)
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{
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env->hvf_lflags.auxbits = env->hvf_lflags.result = 0;
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set_OF(env, env->eflags & CC_O);
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set_SF(env, env->eflags & CC_S);
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set_ZF(env, env->eflags & CC_Z);
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set_AF(env, env->eflags & CC_A);
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set_PF(env, env->eflags & CC_P);
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set_CF(env, env->eflags & CC_C);
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}
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