[PATCH] gdb.trace: Use g packet order in tfile_fetch_registers.

["Marcin Kościelnicki" <koriakin@0x04.net>]

tfile_fetch_registers currently wrongly fetches registers using
gdb order instead of g packet order.  On x86_64 with AVX, this causes
problems with ymm*h and orig_rax registers: gdb has ymm*h first, while
g packet has orig_rax first.

gdb/ChangeLog:

	* tracefile-tfile.c (tfile_fetch_registers): Use g packet order
	instead of gdb order.

gdb/doc/ChangeLog:

	* gdb.texinfo (Trace File Format): Remove misleading information
	about register block ordering.
---
Removed misleading documentation bit.  OK to push now?

 gdb/ChangeLog         |  5 +++++
 gdb/doc/ChangeLog     |  5 +++++
 gdb/doc/gdb.texinfo   |  3 +--
 gdb/tracefile-tfile.c | 11 ++++++-----
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0454696..fd7dd9d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2016-02-10  Marcin Kościelnicki  <koriakin@0x04.net>
 
+	* tracefile-tfile.c (tfile_fetch_registers): Use g packet order
+	instead of gdb order.
+
+2016-02-10  Marcin Kościelnicki  <koriakin@0x04.net>
+
 	* tracefile-tfile.c (trace_tdesc): New static variable.
 	(trace_tdesc_alloc): New static variable.
 	(trace_tdesc_len): New static variable.
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 05d2694..75b24ef 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,8 @@
+2016-02-10  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* gdb.texinfo (Trace File Format): Remove misleading information
+	about register block ordering.
+
 2016-02-01  Doug Evans  <dje@google.com>
 
 	* gdb.texinfo (Value Sizes): Fix typo.
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 2d09d13..9db234e 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -41048,8 +41048,7 @@ endianness.
 @item R @var{bytes}
 Register block.  The number and ordering of bytes matches that of a
 @code{g} packet in the remote protocol.  Note that these are the
-actual bytes, in target order and @value{GDBN} register order, not a
-hexadecimal encoding.
+actual bytes, in target order, not a hexadecimal encoding.
 
 @item M @var{address} @var{length} @var{bytes}...
 Memory block.  This is a contiguous block of memory, at the 8-byte
diff --git a/gdb/tracefile-tfile.c b/gdb/tracefile-tfile.c
index 139d90a..a6c3c9c 100644
--- a/gdb/tracefile-tfile.c
+++ b/gdb/tracefile-tfile.c
@@ -30,6 +30,7 @@
 #include "filenames.h"
 #include "xml-tdesc.h"
 #include "target-descriptions.h"
+#include "remote.h"
 
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0
@@ -857,7 +858,7 @@ tfile_fetch_registers (struct target_ops *ops,
 		       struct regcache *regcache, int regno)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
-  int offset, regn, regsize;
+  int offset, regn, regsize, dummy;
 
   /* An uninitialized reg size says we're not going to be
      successful at getting register blocks.  */
@@ -870,11 +871,12 @@ tfile_fetch_registers (struct target_ops *ops,
 
       tfile_read (regs, trace_regblock_size);
 
-      /* Assume the block is laid out in GDB register number order,
-	 each register with the size that it has in GDB.  */
-      offset = 0;
       for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++)
 	{
+	  if (!remote_register_number_and_offset (get_regcache_arch (regcache),
+						  regn, &dummy, &offset))
+	    continue;
+
 	  regsize = register_size (gdbarch, regn);
 	  /* Make sure we stay within block bounds.  */
 	  if (offset + regsize > trace_regblock_size)
@@ -891,7 +893,6 @@ tfile_fetch_registers (struct target_ops *ops,
 		  regcache_raw_supply (regcache, regn, regs + offset);
 		}
 	    }
-	  offset += regsize;
 	}
     }
   else
-- 
2.7.0