/* * i386 helpers * * Copyright (c) 2008 Fabrice Bellard * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #define DATA_BITS (1 << (3 + SHIFT)) #define SHIFT_MASK (DATA_BITS - 1) #define SIGN_MASK (((target_ulong)1) << (DATA_BITS - 1)) #if DATA_BITS <= 32 #define SHIFT1_MASK 0x1f #else #define SHIFT1_MASK 0x3f #endif #if DATA_BITS == 8 #define SUFFIX b #define DATA_TYPE uint8_t #define DATA_STYPE int8_t #define DATA_MASK 0xff #elif DATA_BITS == 16 #define SUFFIX w #define DATA_TYPE uint16_t #define DATA_STYPE int16_t #define DATA_MASK 0xffff #elif DATA_BITS == 32 #define SUFFIX l #define DATA_TYPE uint32_t #define DATA_STYPE int32_t #define DATA_MASK 0xffffffff #elif DATA_BITS == 64 #define SUFFIX q #define DATA_TYPE uint64_t #define DATA_STYPE int64_t #define DATA_MASK 0xffffffffffffffffULL #else #error unhandled operand size #endif /* dynamic flags computation */ static int glue(compute_all_add, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_SRC; src2 = CC_DST - CC_SRC; cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } static int glue(compute_c_add, SUFFIX)(void) { int cf; target_long src1; src1 = CC_SRC; cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1; return cf; } static int glue(compute_all_adc, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_SRC; src2 = CC_DST - CC_SRC - 1; cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } static int glue(compute_c_adc, SUFFIX)(void) { int cf; target_long src1; src1 = CC_SRC; cf = (DATA_TYPE)CC_DST <= (DATA_TYPE)src1; return cf; } static int glue(compute_all_sub, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_DST + CC_SRC; src2 = CC_SRC; cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } static int glue(compute_c_sub, SUFFIX)(void) { int cf; target_long src1, src2; src1 = CC_DST + CC_SRC; src2 = CC_SRC; cf = (DATA_TYPE)src1 < (DATA_TYPE)src2; return cf; } static int glue(compute_all_sbb, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_DST + CC_SRC + 1; src2 = CC_SRC; cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = lshift((src1 ^ src2) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } static int glue(compute_c_sbb, SUFFIX)(void) { int cf; target_long src1, src2; src1 = CC_DST + CC_SRC + 1; src2 = CC_SRC; cf = (DATA_TYPE)src1 <= (DATA_TYPE)src2; return cf; } static int glue(compute_all_logic, SUFFIX)(void) { int cf, pf, af, zf, sf, of; cf = 0; pf = parity_table[(uint8_t)CC_DST]; af = 0; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = 0; return cf | pf | af | zf | sf | of; } static int glue(compute_c_logic, SUFFIX)(void) { return 0; } static int glue(compute_all_inc, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_DST - 1; src2 = 1; cf = CC_SRC; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = ((CC_DST & DATA_MASK) == SIGN_MASK) << 11; return cf | pf | af | zf | sf | of; } #if DATA_BITS == 32 static int glue(compute_c_inc, SUFFIX)(void) { return CC_SRC; } #endif static int glue(compute_all_dec, SUFFIX)(void) { int cf, pf, af, zf, sf, of; target_long src1, src2; src1 = CC_DST + 1; src2 = 1; cf = CC_SRC; pf = parity_table[(uint8_t)CC_DST]; af = (CC_DST ^ src1 ^ src2) & 0x10; zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = ((CC_DST & DATA_MASK) == ((target_ulong)SIGN_MASK - 1)) << 11; return cf | pf | af | zf | sf | of; } static int glue(compute_all_shl, SUFFIX)(void) { int cf, pf, af, zf, sf, of; cf = (CC_SRC >> (DATA_BITS - 1)) & CC_C; pf = parity_table[(uint8_t)CC_DST]; af = 0; /* undefined */ zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; /* of is defined if shift count == 1 */ of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } static int glue(compute_c_shl, SUFFIX)(void) { return (CC_SRC >> (DATA_BITS - 1)) & CC_C; } #if DATA_BITS == 32 static int glue(compute_c_sar, SUFFIX)(void) { return CC_SRC & 1; } #endif static int glue(compute_all_sar, SUFFIX)(void) { int cf, pf, af, zf, sf, of; cf = CC_SRC & 1; pf = parity_table[(uint8_t)CC_DST]; af = 0; /* undefined */ zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; /* of is defined if shift count == 1 */ of = lshift(CC_SRC ^ CC_DST, 12 - DATA_BITS) & CC_O; return cf | pf | af | zf | sf | of; } #if DATA_BITS == 32 static int glue(compute_c_mul, SUFFIX)(void) { int cf; cf = (CC_SRC != 0); return cf; } #endif /* NOTE: we compute the flags like the P4. On olders CPUs, only OF and CF are modified and it is slower to do that. */ static int glue(compute_all_mul, SUFFIX)(void) { int cf, pf, af, zf, sf, of; cf = (CC_SRC != 0); pf = parity_table[(uint8_t)CC_DST]; af = 0; /* undefined */ zf = ((DATA_TYPE)CC_DST == 0) << 6; sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80; of = cf << 11; return cf | pf | af | zf | sf | of; } /* shifts */ target_ulong glue(helper_rcl, SUFFIX)(target_ulong t0, target_ulong t1) { int count, eflags; target_ulong src; target_long res; count = t1 & SHIFT1_MASK; #if DATA_BITS == 16 count = rclw_table[count]; #elif DATA_BITS == 8 count = rclb_table[count]; #endif if (count) { eflags = helper_cc_compute_all(CC_OP); t0 &= DATA_MASK; src = t0; res = (t0 << count) | ((target_ulong)(eflags & CC_C) << (count - 1)); if (count > 1) res |= t0 >> (DATA_BITS + 1 - count); t0 = res; env->cc_tmp = (eflags & ~(CC_C | CC_O)) | (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | ((src >> (DATA_BITS - count)) & CC_C); } else { env->cc_tmp = -1; } return t0; } target_ulong glue(helper_rcr, SUFFIX)(target_ulong t0, target_ulong t1) { int count, eflags; target_ulong src; target_long res; count = t1 & SHIFT1_MASK; #if DATA_BITS == 16 count = rclw_table[count]; #elif DATA_BITS == 8 count = rclb_table[count]; #endif if (count) { eflags = helper_cc_compute_all(CC_OP); t0 &= DATA_MASK; src = t0; res = (t0 >> count) | ((target_ulong)(eflags & CC_C) << (DATA_BITS - count)); if (count > 1) res |= t0 << (DATA_BITS + 1 - count); t0 = res; env->cc_tmp = (eflags & ~(CC_C | CC_O)) | (lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) | ((src >> (count - 1)) & CC_C); } else { env->cc_tmp = -1; } return t0; } #undef DATA_BITS #undef SHIFT_MASK #undef SHIFT1_MASK #undef SIGN_MASK #undef DATA_TYPE #undef DATA_STYPE #undef DATA_MASK #undef SUFFIX