diff options
| author | Jan Beulich <jbeulich@suse.com> | 2021-03-25 08:19:21 +0100 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2021-03-25 08:19:21 +0100 |
| commit | 5364285240737423a4d6368aba803a031d293b95 (patch) | |
| tree | 93558016404461968935f1d30751cd8e50dbfc01 /opcodes | |
| parent | c0e54661f755b1eb1cbf745bc4eb4a068cd5ada2 (diff) | |
| download | gdb-5364285240737423a4d6368aba803a031d293b95.zip gdb-5364285240737423a4d6368aba803a031d293b95.tar.gz gdb-5364285240737423a4d6368aba803a031d293b95.tar.bz2 | |
x86: flag as bad AVX512 insns with EVEX.z set but EVEX.aaa clear
This combination makes no sense and is documented to cause #UD.
Diffstat (limited to 'opcodes')
| -rw-r--r-- | opcodes/ChangeLog | 5 | ||||
| -rw-r--r-- | opcodes/i386-dis.c | 7 |
2 files changed, 12 insertions, 0 deletions
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog index bd02d2b..a4c880b 100644 --- a/opcodes/ChangeLog +++ b/opcodes/ChangeLog @@ -1,5 +1,10 @@ 2021-03-25 Jan Beulich <jbeulich@suse.com> + * i386-dis.c (print_insn): Mark as bad EVEX encodings specifying + zeroing-masking without masking. + +2021-03-25 Jan Beulich <jbeulich@suse.com> + * i386-opc.tbl (invlpgb): Fix multi-operand form. (pvalidate, rmpupdate, rmpadjust): Add multi-operand forms. Mark single-operand forms as deprecated. diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c index 9e5c412..00ed251 100644 --- a/opcodes/i386-dis.c +++ b/opcodes/i386-dis.c @@ -9739,6 +9739,13 @@ print_insn (bfd_vma pc, disassemble_info *info) return end_codep - priv.the_buffer; } + /* If EVEX.z is set, there must be an actual mask register in use. */ + if (vex.zeroing && vex.mask_register_specifier == 0) + { + (*info->fprintf_func) (info->stream, "(bad)"); + return end_codep - priv.the_buffer; + } + switch (dp->prefix_requirement) { case PREFIX_DATA: |