mirror of
https://gitlab.os-k.eu/os-k-team/kvisc.git
synced 2023-08-25 14:05:46 +02:00
242 lines
4.0 KiB
C
242 lines
4.0 KiB
C
// The OS/K Team licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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#include <in/instrs.h>
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//----------------------------------------------------------------------------//
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#define STR_MOVE(reg, len) \
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if ((flg & DF) == 0) \
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R(reg) += len; \
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else \
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R(reg) -= len;
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//----------------------------------------------------------------------------//
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static void stos_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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DECV(v2, p2);
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writemem(ctx, v2, R(p1->reg), len);
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STR_MOVE(p1->reg, len);
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}
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IMPL_START_0(stosb)
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{
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stos_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(stosw)
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{
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stos_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(stosl)
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{
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stos_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(stosq)
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{
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stos_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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static void lods_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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R(p1->reg) = readmem(ctx, R(p2->reg), len);
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flg = (R(p1->reg) == 0 ? flg|ZF : flg&~ZF);
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STR_MOVE(p2->reg, len);
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}
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IMPL_START_0(lodsb)
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{
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lods_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(lodsw)
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{
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lods_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(lodsl)
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{
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lods_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(lodsq)
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{
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lods_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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static void scas_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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DECV(v2, p2);
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ulong x = readmem(ctx, R(p1->reg), len);
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COMPARE(x, v2);
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if (x == 0) {
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flg |= ZF;
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}
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else if (!(flg&ZF)) {
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STR_MOVE(p1->reg, len);
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}
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}
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IMPL_START_0(scasb)
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{
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scas_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(scasw)
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{
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scas_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(scasl)
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{
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scas_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(scasq)
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{
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scas_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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static void cmps_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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ulong x1 = readmem(ctx, R(p1->reg), len);
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ulong x2 = readmem(ctx, R(p2->reg), len);
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COMPARE(x1, x2);
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STR_MOVE(p1->reg, len);
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STR_MOVE(p2->reg, len);
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}
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IMPL_START_0(cmpsb)
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{
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cmps_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(cmpsw)
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{
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cmps_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(cmpsl)
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{
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cmps_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(cmpsq)
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{
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cmps_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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static void cmpzs_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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ulong x1 = readmem(ctx, R(p1->reg), len);
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ulong x2 = readmem(ctx, R(p2->reg), len);
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COMPARE(x1, x2);
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if (!x1 && !x2)
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flg &= ~ZF;
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STR_MOVE(p1->reg, len);
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STR_MOVE(p2->reg, len);
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}
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IMPL_START_0(cmpzsb)
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{
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cmpzs_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(cmpzsw)
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{
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cmpzs_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(cmpzsl)
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{
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cmpzs_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(cmpzsq)
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{
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cmpzs_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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static void movs_impl(ctx_t *ctx, acc_t *p1, acc_t *p2, uint len)
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{
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ulong x = readmem(ctx, R(p2->reg), len);
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writemem(ctx, x, R(p1->reg), len);
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flg = (x == 0 ? flg|ZF : flg&~ZF);
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STR_MOVE(p1->reg, len);
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STR_MOVE(p2->reg, len);
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}
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IMPL_START_0(movsb)
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{
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movs_impl(ctx, p1, p2, 1);
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}
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IMPL_END;
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IMPL_START_0(movsw)
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{
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movs_impl(ctx, p1, p2, 2);
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}
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IMPL_END;
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IMPL_START_0(movsl)
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{
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movs_impl(ctx, p1, p2, 4);
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}
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IMPL_END;
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IMPL_START_0(movsq)
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{
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movs_impl(ctx, p1, p2, 8);
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}
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IMPL_END;
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//----------------------------------------------------------------------------//
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