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[dynarmic] fix sign extension logic on x64

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Exverge
2026-09-13 12:10:03 -04:00
committed by crueter
parent 1a48de6e55
commit 415df0cfe4
1 changed files with 10 additions and 4 deletions
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src/dynarmic/src/dynarmic/backend/x64/emit_x64_memory.h
+10 -4
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@@ -85,8 +85,13 @@ template<>
code.mov(tmp, vaddr); code.mov(tmp, vaddr);
code.shr(tmp, int(page_table_const_bits)); code.shr(tmp, int(page_table_const_bits));
code.shl(tmp, int(ctx.conf.page_table_log2_stride));
code.mov(page, qword[r14 + tmp.cvt64()]); if (ctx.conf.page_table_log2_stride > 3) {
code.shl(tmp, int(ctx.conf.page_table_log2_stride));
code.mov(page, qword[r14 + tmp.cvt64()]);
} else {
code.mov(page, qword[r14 + tmp.cvt64() * int(ctx.conf.page_table_log2_stride)]);
}
// check for marked bit, use as unmapped if marked // check for marked bit, use as unmapped if marked
if (ctx.conf.page_table_marked_bit) { if (ctx.conf.page_table_marked_bit) {
@@ -102,9 +107,10 @@ template<>
code.mov(tmp, ctx.conf.page_table_pointer_mask); code.mov(tmp, ctx.conf.page_table_pointer_mask);
code.and_(page, tmp); code.and_(page, tmp);
} }
// check for sign bit, apply sign extension as needed
if (ctx.conf.page_table_sign_extension) { if (ctx.conf.page_table_sign_extension) {
code.shl(page, *ctx.conf.page_table_sign_extension); code.shl(page, 63 - int(*ctx.conf.page_table_sign_extension));
code.sar(page, *ctx.conf.page_table_sign_extension); code.sar(page, 63 - int(*ctx.conf.page_table_sign_extension));
} }
code.jz(abort, code.T_NEAR); code.jz(abort, code.T_NEAR);