qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [PATCH qom v4 6/7] disas: cris: Fix 0 buffer length case


From: Peter Crosthwaite
Subject: [Qemu-devel] [PATCH qom v4 6/7] disas: cris: Fix 0 buffer length case
Date: Tue, 23 Jun 2015 20:57:37 -0700

Cris has the complication of variable length instructions and has
a check in place to clamp memory reads in case the disas request
doesn't have enough bytes for the instruction being disas'd. This
breaks down in the case where disassembling for the monitor where
the buffer length is defaulted to 0.

The buffer length should never be zero for a regular target_disas,
so we can safely assume the 0 case is for the monitor in which case
consider the buffer length to be the max for cris instructions.

Signed-off-by: Peter Crosthwaite <address@hidden>
Reviewed-by: Edgar E. Iglesias <address@hidden>
---
 disas/cris.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/disas/cris.c b/disas/cris.c
index e6cff7a..1b76a09 100644
--- a/disas/cris.c
+++ b/disas/cris.c
@@ -2575,9 +2575,9 @@ print_insn_cris_generic (bfd_vma memaddr,
      If we can't get any data, or we do not get enough data, we print
      the error message.  */
 
-  nbytes = info->buffer_length;
-  if (nbytes > MAX_BYTES_PER_CRIS_INSN)
-         nbytes = MAX_BYTES_PER_CRIS_INSN;
+  nbytes = info->buffer_length ? info->buffer_length
+                               : MAX_BYTES_PER_CRIS_INSN;
+  nbytes = MIN(nbytes, MAX_BYTES_PER_CRIS_INSN);
   status = (*info->read_memory_func) (memaddr, buffer, nbytes, info);  
 
   /* If we did not get all we asked for, then clear the rest.
-- 
1.9.1




reply via email to

[Prev in Thread] Current Thread [Next in Thread]