On 06/04/2018 15:41, Eugene Minibaev wrote: > Signed-off-by: Eugene Minibaev <m...@kitsu.me> > --- > It seems that x86 vector instructions encoded in VEX are not properly > decoded because of missing bit, here is the example:
Applied, thanks! Paolo > IN: > 0x08048060: c5 f9 6f c1 vmovdqa %xmm1, %xmm0 > 0x08048064: b8 01 00 00 00 movl $1, %eax > 0x08048069: bb 00 00 00 00 movl $0, %ebx > 0x0804806e: cd 80 int $0x80 > > OUT: [size=191] > 0x604370c0: 41 8b 6e ec movl -0x14(%r14), %ebp > 0x604370c4: 85 ed testl %ebp, %ebp > 0x604370c6: 0f 8c a9 00 00 00 jl 0x60437175 > 0x604370cc: 41 8b 6e 08 movl 8(%r14), %ebp > 0x604370d0: 0f b7 ed movzwl %bp, %ebp > 0x604370d3: 49 8b fe movq %r14, %rdi > 0x604370d6: 8b f5 movl %ebp, %esi > 0x604370d8: e8 24 7f cd ff callq 0x6010f001 > 0x604370dd: 41 8b 6e 18 movl 0x18(%r14), %ebp > 0x604370e1: 65 67 0f b7 6d 00 movzwl %gs:(%ebp), %ebp > 0x604370e7: 41 8b 5e 08 movl 8(%r14), %ebx > 0x604370eb: 0f b7 db movzwl %bx, %ebx > 0x604370ee: 49 8b fe movq %r14, %rdi > 0x604370f1: 8b f3 movl %ebx, %esi > 0x604370f3: 8b d5 movl %ebp, %edx > 0x604370f5: e8 b1 06 cd ff callq 0x601077ab > 0x604370fa: 41 8b 6e 38 movl 0x38(%r14), %ebp > 0x604370fe: d1 e5 shll $1, %ebp > 0x60437100: 41 8b 5e 18 movl 0x18(%r14), %ebx > ... > 0x6043716b: ba 02 00 00 00 movl $2, %edx > 0x60437170: e8 20 8d cb ff callq 0x600efe95 > 0x60437175: b8 43 70 43 60 movl $0x60437043, %eax > 0x6043717a: e9 99 fe ff ff jmp 0x60437018 > > qemu: uncaught target signal 11 (Segmentation fault) - core dumped > make: *** [Makefile:6: run] Segmentation fault (core dumped) > --- > target/i386/translate.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/target/i386/translate.c b/target/i386/translate.c > index 0135415d92..e2ce7e4061 100644 > --- a/target/i386/translate.c > +++ b/target/i386/translate.c > @@ -4564,7 +4564,7 @@ static target_ulong disas_insn(DisasContext *s, > CPUState *cpu) > rex_r = (~vex2 >> 4) & 8; > if (b == 0xc5) { > vex3 = vex2; > - b = x86_ldub_code(env, s); > + b = x86_ldub_code(env, s) | 0x100; > } else { > #ifdef TARGET_X86_64 > s->rex_x = (~vex2 >> 3) & 8; >