tree dc9d690dd2227a27f6fae1745ce11de31e8811ff
parent b8d2eff3b1c6e46238a5fb3f56843e9974b4889f
author Ricardo Neri <ricardo.neri-calderon@linux.intel.com> 1509135934 -0700
committer Thomas Gleixner <tglx@linutronix.de> 1509569409 +0100

x86/mpx: Do not use SIB.index if its value is 100b and ModRM.mod is not 11b

Section 2.2.1.2 of the Intel 64 and IA-32 Architectures Software
Developer's Manual volume 2A states that when ModRM.mod !=11b and
ModRM.rm = 100b indexed register-indirect addressing is used. In other
words, a SIB byte follows the ModRM byte. In the specific case of
SIB.index = 100b, the scale*index portion of the computation of the
effective address is null. To signal callers of this particular situation,
get_reg_offset() can return -EDOM (-EINVAL continues to indicate that an
error when decoding the SIB byte).

An example of this situation can be the following instruction:

   8b 4c 23 80       mov -0x80(%rbx,%riz,1),%rcx
   ModRM:            0x4c [mod:1b][reg:1b][rm:100b]
   SIB:              0x23 [scale:0b][index:100b][base:11b]
   Displacement:     0x80  (1-byte, as per ModRM.mod = 1b)

The %riz 'register' indicates a null index.

In long mode, a REX prefix may be used. When a REX prefix is present,
REX.X adds a fourth bit to the register selection of SIB.index. This gives
the ability to refer to all the 16 general purpose registers. When REX.X is
1b and SIB.index is 100b, the index is indicated in %r12. In our example,
this would look like:

   42 8b 4c 23 80    mov -0x80(%rbx,%r12,1),%rcx
   REX:              0x42 [W:0b][R:0b][X:1b][B:0b]
   ModRM:            0x4c [mod:1b][reg:1b][rm:100b]
   SIB:              0x23 [scale:0b][.X: 1b, index:100b][.B:0b, base:11b]
   Displacement:     0x80  (1-byte, as per ModRM.mod = 1b)

%r12 is a valid register to use in the scale*index part of the effective
address computation.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Adan Hawthorn <adanhawthorn@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: ricardo.neri@intel.com
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Qiaowei Ren <qiaowei.ren@intel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Nathan Howard <liverlint@gmail.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Chen Yucong <slaoub@gmail.com>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Joe Perches <joe@perches.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/1509135945-13762-8-git-send-email-ricardo.neri-calderon@linux.intel.com