641 lines
14 KiB
C
641 lines
14 KiB
C
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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 (1 << (DATA_BITS - 1))
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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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#else
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#error unhandled operand size
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#endif
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/* dynamic flags computation */
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static int glue(compute_all_add, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_DST - CC_SRC;
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cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_add, SUFFIX)(void)
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{
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int src1, cf;
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src1 = CC_SRC;
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cf = (DATA_TYPE)CC_DST < (DATA_TYPE)src1;
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return cf;
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}
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static int glue(compute_all_sub, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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cf = (DATA_TYPE)src1 < (DATA_TYPE)src2;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_sub, SUFFIX)(void)
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{
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int src1, src2, cf;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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cf = (DATA_TYPE)src1 < (DATA_TYPE)src1;
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return cf;
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}
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static int glue(compute_all_logic, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = 0;
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pf = parity_table[(uint8_t)CC_DST];
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af = 0;
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = 0;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_logic, SUFFIX)(void)
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{
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return 0;
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}
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static int glue(compute_all_inc, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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int src1, src2;
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src1 = CC_DST - 1;
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src2 = 1;
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cf = CC_SRC;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_inc, SUFFIX)(void)
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{
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return CC_SRC;
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}
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static int glue(compute_all_dec, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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int src1, src2;
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src1 = CC_DST + 1;
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src2 = 1;
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cf = CC_SRC;
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pf = parity_table[(uint8_t)CC_DST];
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af = (CC_DST ^ src1 ^ src2) & 0x10;
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = lshift((src1 ^ src2 ^ -1) & (src1 ^ CC_DST), 12 - DATA_BITS) & CC_O;
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_all_shl, SUFFIX)(void)
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{
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int cf, pf, af, zf, sf, of;
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cf = CC_SRC & 1;
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pf = parity_table[(uint8_t)CC_DST];
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af = 0; /* undefined */
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zf = ((DATA_TYPE)CC_DST != 0) << 6;
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sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
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of = sf << 4; /* only meaniful for shr with count == 1 */
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return cf | pf | af | zf | sf | of;
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}
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static int glue(compute_c_shl, SUFFIX)(void)
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{
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return CC_SRC & 1;
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}
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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if ((DATA_TYPE)src1 < (DATA_TYPE)src2)
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PC += PARAM1;
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else
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PC += PARAM2;
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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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PC += PARAM1;
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else
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PC += PARAM2;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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if ((DATA_TYPE)src1 <= (DATA_TYPE)src2)
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PC += PARAM1;
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else
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PC += PARAM2;
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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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PC += PARAM1;
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else
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PC += PARAM2;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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if ((DATA_STYPE)src1 < (DATA_STYPE)src2)
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PC += PARAM1;
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else
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PC += PARAM2;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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if ((DATA_STYPE)src1 <= (DATA_STYPE)src2)
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PC += PARAM1;
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else
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PC += PARAM2;
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FORCE_RET();
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}
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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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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int src1, src2;
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src1 = CC_SRC;
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src2 = CC_SRC - CC_DST;
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T0 = ((DATA_STYPE)src1 <= (DATA_STYPE)src2);
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}
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/* shifts */
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void OPPROTO glue(glue(op_rol, SUFFIX), _T0_T1_cc)(void)
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{
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int count, src;
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count = T1 & SHIFT_MASK;
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if (count) {
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CC_SRC = cc_table[CC_OP].compute_all() & ~(CC_O | CC_C);
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src = T0;
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T0 &= DATA_MASK;
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T0 = (T0 << count) | (T0 >> (DATA_BITS - count));
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CC_SRC |= (lshift(src ^ T0, 11 - (DATA_BITS - 1)) & CC_O) |
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(T0 & CC_C);
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CC_OP = CC_OP_EFLAGS;
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}
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}
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void OPPROTO glue(glue(op_ror, SUFFIX), _T0_T1_cc)(void)
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{
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int count, src;
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count = T1 & SHIFT_MASK;
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if (count) {
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CC_SRC = cc_table[CC_OP].compute_all() & ~(CC_O | CC_C);
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src = T0;
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T0 &= DATA_MASK;
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T0 = (T0 >> count) | (T0 << (DATA_BITS - count));
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CC_SRC |= (lshift(src ^ T0, 11 - (DATA_BITS - 1)) & CC_O) |
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((T0 >> (DATA_BITS - 1)) & CC_C);
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CC_OP = CC_OP_EFLAGS;
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}
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}
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void OPPROTO glue(glue(op_rcl, SUFFIX), _T0_T1_cc)(void)
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{
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int count, res, eflags;
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unsigned int src;
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count = T1 & 0x1f;
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#if DATA_BITS == 16
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count = rclw_table[count];
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#elif DATA_BITS == 8
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count = rclb_table[count];
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#endif
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if (count) {
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eflags = cc_table[CC_OP].compute_all();
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src = T0;
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res = (T0 << count) | ((eflags & CC_C) << (count - 1));
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if (count > 1)
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res |= T0 >> (DATA_BITS + 1 - count);
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T0 = res;
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CC_SRC = (eflags & ~(CC_C | CC_O)) |
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(lshift(src ^ T0, 11 - (DATA_BITS - 1)) & CC_O) |
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((src >> (DATA_BITS - count)) & CC_C);
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CC_OP = CC_OP_EFLAGS;
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}
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}
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void OPPROTO glue(glue(op_rcr, SUFFIX), _T0_T1_cc)(void)
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{
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int count, res, eflags;
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unsigned int src;
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count = T1 & 0x1f;
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#if DATA_BITS == 16
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count = rclw_table[count];
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#elif DATA_BITS == 8
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count = rclb_table[count];
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#endif
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if (count) {
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eflags = cc_table[CC_OP].compute_all();
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src = T0;
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res = (T0 >> count) | ((eflags & CC_C) << (DATA_BITS - count));
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if (count > 1)
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res |= T0 << (DATA_BITS + 1 - count);
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T0 = res;
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CC_SRC = (eflags & ~(CC_C | CC_O)) |
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(lshift(src ^ T0, 11 - (DATA_BITS - 1)) & CC_O) |
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((src >> (count - 1)) & CC_C);
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CC_OP = CC_OP_EFLAGS;
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}
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}
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void OPPROTO glue(glue(op_shl, SUFFIX), _T0_T1_cc)(void)
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{
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int count;
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count = T1 & 0x1f;
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if (count == 1) {
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CC_SRC = T0;
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T0 = T0 << 1;
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CC_DST = T0;
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CC_OP = CC_OP_ADDB + SHIFT;
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} else if (count) {
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CC_SRC = T0 >> (DATA_BITS - count);
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T0 = T0 << count;
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CC_DST = T0;
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CC_OP = CC_OP_SHLB + SHIFT;
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}
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}
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void OPPROTO glue(glue(op_shr, SUFFIX), _T0_T1_cc)(void)
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{
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int count;
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count = T1 & 0x1f;
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if (count) {
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T0 &= DATA_MASK;
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CC_SRC = T0 >> (count - 1);
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T0 = T0 >> count;
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CC_DST = T0;
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CC_OP = CC_OP_SHLB + SHIFT;
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}
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}
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void OPPROTO glue(glue(op_sar, SUFFIX), _T0_T1_cc)(void)
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{
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int count, src;
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count = T1 & 0x1f;
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if (count) {
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src = (DATA_STYPE)T0;
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CC_SRC = src >> (count - 1);
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T0 = src >> count;
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CC_DST = T0;
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CC_OP = CC_OP_SHLB + SHIFT;
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}
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}
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/* string operations */
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/* XXX: maybe use lower level instructions to ease exception handling */
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void OPPROTO glue(op_movs, SUFFIX)(void)
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{
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int v;
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v = glue(ldu, SUFFIX)((void *)ESI);
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glue(st, SUFFIX)((void *)EDI, v);
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ESI += (DF << SHIFT);
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EDI += (DF << SHIFT);
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}
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void OPPROTO glue(op_rep_movs, SUFFIX)(void)
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{
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int v, inc;
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inc = (DF << SHIFT);
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while (ECX != 0) {
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v = glue(ldu, SUFFIX)((void *)ESI);
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glue(st, SUFFIX)((void *)EDI, v);
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ESI += inc;
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EDI += inc;
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ECX--;
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}
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}
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void OPPROTO glue(op_stos, SUFFIX)(void)
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{
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glue(st, SUFFIX)((void *)EDI, EAX);
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EDI += (DF << SHIFT);
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}
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void OPPROTO glue(op_rep_stos, SUFFIX)(void)
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{
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int inc;
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inc = (DF << SHIFT);
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while (ECX != 0) {
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glue(st, SUFFIX)((void *)EDI, EAX);
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EDI += inc;
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ECX--;
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}
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}
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void OPPROTO glue(op_lods, SUFFIX)(void)
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{
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int v;
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v = glue(ldu, SUFFIX)((void *)ESI);
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#if SHIFT == 0
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EAX = (EAX & ~0xff) | v;
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#elif SHIFT == 1
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EAX = (EAX & ~0xffff) | v;
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#else
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EAX = v;
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#endif
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ESI += (DF << SHIFT);
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}
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/* don't know if it is used */
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void OPPROTO glue(op_rep_lods, SUFFIX)(void)
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{
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int v, inc;
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inc = (DF << SHIFT);
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while (ECX != 0) {
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v = glue(ldu, SUFFIX)((void *)ESI);
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#if SHIFT == 0
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EAX = (EAX & ~0xff) | v;
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#elif SHIFT == 1
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EAX = (EAX & ~0xffff) | v;
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#else
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EAX = v;
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#endif
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ESI += inc;
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ECX--;
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}
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}
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void OPPROTO glue(op_scas, SUFFIX)(void)
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{
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int v;
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v = glue(ldu, SUFFIX)((void *)ESI);
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ESI += (DF << SHIFT);
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CC_SRC = EAX;
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CC_DST = EAX - v;
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}
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void OPPROTO glue(op_repz_scas, SUFFIX)(void)
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{
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int v1, v2, inc;
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if (ECX != 0) {
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/* NOTE: the flags are not modified if ECX == 0 */
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#if SHIFT == 0
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v1 = EAX & 0xff;
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#elif SHIFT == 1
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v1 = EAX & 0xffff;
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#else
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v1 = EAX;
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#endif
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inc = (DF << SHIFT);
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do {
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v2 = glue(ldu, SUFFIX)((void *)ESI);
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if (v1 != v2)
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break;
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ESI += inc;
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ECX--;
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} while (ECX != 0);
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CC_SRC = v1;
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CC_DST = v1 - v2;
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CC_OP = CC_OP_SUBB + SHIFT;
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}
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}
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void OPPROTO glue(op_repnz_scas, SUFFIX)(void)
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{
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int v1, v2, inc;
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if (ECX != 0) {
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/* NOTE: the flags are not modified if ECX == 0 */
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#if SHIFT == 0
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v1 = EAX & 0xff;
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#elif SHIFT == 1
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v1 = EAX & 0xffff;
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#else
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v1 = EAX;
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#endif
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inc = (DF << SHIFT);
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do {
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|
v2 = glue(ldu, SUFFIX)((void *)ESI);
|
|
if (v1 == v2)
|
|
break;
|
|
ESI += inc;
|
|
ECX--;
|
|
} while (ECX != 0);
|
|
CC_SRC = v1;
|
|
CC_DST = v1 - v2;
|
|
CC_OP = CC_OP_SUBB + SHIFT;
|
|
}
|
|
}
|
|
|
|
void OPPROTO glue(op_cmps, SUFFIX)(void)
|
|
{
|
|
int v1, v2;
|
|
v1 = glue(ldu, SUFFIX)((void *)ESI);
|
|
v2 = glue(ldu, SUFFIX)((void *)EDI);
|
|
ESI += (DF << SHIFT);
|
|
EDI += (DF << SHIFT);
|
|
CC_SRC = v1;
|
|
CC_DST = v1 - v2;
|
|
}
|
|
|
|
void OPPROTO glue(op_repz_cmps, SUFFIX)(void)
|
|
{
|
|
int v1, v2, inc;
|
|
if (ECX != 0) {
|
|
inc = (DF << SHIFT);
|
|
do {
|
|
v1 = glue(ldu, SUFFIX)((void *)ESI);
|
|
v2 = glue(ldu, SUFFIX)((void *)EDI);
|
|
if (v1 != v2)
|
|
break;
|
|
ESI += inc;
|
|
EDI += inc;
|
|
ECX--;
|
|
} while (ECX != 0);
|
|
CC_SRC = v1;
|
|
CC_DST = v1 - v2;
|
|
CC_OP = CC_OP_SUBB + SHIFT;
|
|
}
|
|
}
|
|
|
|
void OPPROTO glue(op_repnz_cmps, SUFFIX)(void)
|
|
{
|
|
int v1, v2, inc;
|
|
if (ECX != 0) {
|
|
inc = (DF << SHIFT);
|
|
do {
|
|
v1 = glue(ldu, SUFFIX)((void *)ESI);
|
|
v2 = glue(ldu, SUFFIX)((void *)EDI);
|
|
if (v1 == v2)
|
|
break;
|
|
ESI += inc;
|
|
EDI += inc;
|
|
ECX--;
|
|
} while (ECX != 0);
|
|
CC_SRC = v1;
|
|
CC_DST = v1 - v2;
|
|
CC_OP = CC_OP_SUBB + SHIFT;
|
|
}
|
|
}
|
|
|
|
/* port I/O */
|
|
|
|
void OPPROTO glue(op_outs, SUFFIX)(void)
|
|
{
|
|
int v, dx;
|
|
dx = EDX & 0xffff;
|
|
v = glue(ldu, SUFFIX)((void *)ESI);
|
|
glue(cpu_x86_out, SUFFIX)(dx, v);
|
|
ESI += (DF << SHIFT);
|
|
}
|
|
|
|
void OPPROTO glue(op_rep_outs, SUFFIX)(void)
|
|
{
|
|
int v, dx, inc;
|
|
inc = (DF << SHIFT);
|
|
dx = EDX & 0xffff;
|
|
while (ECX != 0) {
|
|
v = glue(ldu, SUFFIX)((void *)ESI);
|
|
glue(cpu_x86_out, SUFFIX)(dx, v);
|
|
ESI += inc;
|
|
ECX--;
|
|
}
|
|
}
|
|
|
|
void OPPROTO glue(op_ins, SUFFIX)(void)
|
|
{
|
|
int v, dx;
|
|
dx = EDX & 0xffff;
|
|
v = glue(cpu_x86_in, SUFFIX)(dx);
|
|
glue(st, SUFFIX)((void *)EDI, v);
|
|
EDI += (DF << SHIFT);
|
|
}
|
|
|
|
void OPPROTO glue(op_rep_ins, SUFFIX)(void)
|
|
{
|
|
int v, dx, inc;
|
|
inc = (DF << SHIFT);
|
|
dx = EDX & 0xffff;
|
|
while (ECX != 0) {
|
|
v = glue(cpu_x86_in, SUFFIX)(dx);
|
|
glue(st, SUFFIX)((void *)EDI, v);
|
|
EDI += (DF << SHIFT);
|
|
ECX--;
|
|
}
|
|
}
|
|
|
|
void OPPROTO glue(glue(op_out, SUFFIX), _T0_T1)(void)
|
|
{
|
|
glue(cpu_x86_out, SUFFIX)(T0 & 0xffff, T1 & DATA_MASK);
|
|
}
|
|
|
|
void OPPROTO glue(glue(op_in, SUFFIX), _T0_T1)(void)
|
|
{
|
|
T1 = glue(cpu_x86_in, SUFFIX)(T0 & 0xffff);
|
|
}
|
|
|
|
#undef DATA_BITS
|
|
#undef SHIFT_MASK
|
|
#undef SIGN_MASK
|
|
#undef DATA_TYPE
|
|
#undef DATA_STYPE
|
|
#undef DATA_MASK
|
|
#undef SUFFIX
|