T0b1/fadec
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

decode: Fix LOCK handling for MOV CR/DR

Browse Source
This commit is contained in:
Alexis Engelke
2021-01-23 14:28:27 +01:00
parent 95371637ea
commit fe68dbb743
2 changed files with 3 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
decode.c
View File

@@ -334,7 +334,7 @@ prefix_end:
op_modrm->type = FD_OT_REG;
op_modrm->reg = modrm | (prefix_rex & PREFIX_REXB ? 8 : 0);
op_modrm->misc = FD_RT_GPL;
goto op_sizes;
goto skip_modrm;
}
if (UNLIKELY(DESC_HAS_IMPLICIT(desc)))
@@ -425,6 +425,7 @@ prefix_end:
}
}
}
skip_modrm:
if (UNLIKELY(DESC_HAS_VEXREG(desc)))
{
@@ -564,7 +565,6 @@ prefix_end:
instr->flags |= FD_FLAG_LOCK;
}
op_sizes:;
uint8_t operand_sizes[4] = {
1 << DESC_SIZE_FIX1(desc) >> 1, 1 << DESC_SIZE_FIX2(desc), op_size, vec_size
};

1
tests/test_decode.c
View File

@@ -106,6 +106,7 @@ main(int argc, char** argv)
TEST64("\x48\x0f\x20\xd0", "mov rax, cr2"); // cr2 + REX.W
TEST64("\x44\x0f\x20\x08", "UD"); // cr9
TEST64("\x44\x0f\x21\x00", "UD"); // dr8
TEST32("\xf0\x0f\x20\x00", "UD"); // LOCK
TEST("\x8c\xc0", "mov ax, es");
TEST64("\x44\x8c\xc0", "mov ax, es");
TEST64("\x44\x8c\xf0", "UD"); // no segment register 6