RE: [Patch, microblaze]: Communicate in larger blocks with the target.

[Ajit Kumar Agarwal <ajit dot kumar dot agarwal at xilinx dot com>]

Hello Pedro:

Review feedback are incorporated. Could you please review and let me know if its okay.

[Patch, microblaze]: Use target_read_code in microblaze_fetch_instruction

This patch uses target_read_code instead of target_read_memory in
microblaze_fetch instruction in order to use cache memory accesses
requested in target_read_code.

ChangeLog:
2014-06-17 Ajit Agarwal <ajitkum@xilinx.com>

---
 gdb/microblaze-tdep.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/gdb/microblaze-tdep.c b/gdb/microblaze-tdep.c
index 14c1b52..4e5b2d5 100644
--- a/gdb/microblaze-tdep.c
+++ b/gdb/microblaze-tdep.c
@@ -126,7 +126,7 @@ microblaze_fetch_instruction (CORE_ADDR pc)
   gdb_byte buf[4];
 
   /* If we can't read the instruction at PC, return zero.  */
-  if (target_read_memory (pc, buf, sizeof (buf)))
+  if (target_read_code (pc, buf, sizeof (buf)))
     return 0;
 
   return extract_unsigned_integer (buf, 4, byte_order);
-- 
1.7.1
-----Original Message-----
From: Pedro Alves [mailto:palves@redhat.com] 
Sent: Tuesday, June 17, 2014 10:22 PM
To: Ajit Kumar Agarwal; gdb-patches@sourceware.org
Cc: Michael Eager; Vinod Kathail; Vidhumouli Hunsigida; Nagaraju Mekala
Subject: Re: [Patch, microblaze]: Communicate in larger blocks with the target.

On 06/17/2014 05:49 PM, Ajit Kumar Agarwal wrote:
> 
> 
> -----Original Message-----
> From: Pedro Alves [mailto:palves@redhat.com]
> Sent: Tuesday, June 17, 2014 10:05 PM
> To: Pedro Alves; Ajit Kumar Agarwal; gdb-patches@sourceware.org
> Cc: Michael Eager; Vinod Kathail; Vidhumouli Hunsigida; Nagaraju 
> Mekala
> Subject: Re: [Patch, microblaze]: Communicate in larger blocks with the target.
> 
> On 06/17/2014 02:49 PM, Pedro Alves wrote:
>> On 06/17/2014 10:03 AM, Ajit Kumar Agarwal wrote:
>>> Please find the following patch.    
>>>
>>>  [Patch, microblaze]: Communicate in larger blocks with the target.
>>>     
>>>     Communicate in larger blocks with the target. The chunk of memory
>>>     will be read from the target and then used in microblaze_analyze_prologue.
>>>     The above process minimizes the transaction with the Debug Agent.
>>
>> We have core infrustructure for this now, in the form of a code cache 
>> that reads ahead.  Could you try using it?
>> All you have to do is replace target_read_memory calls that are 
>> actually reading code, with target_read_code calls.  See i386-tdep.c 
>> for example.
> 
>>> To be clear, I'm not talking about changing the new calls in your patch, but instead, to change the existing calls.  Then your patch won't be necessary.
> 
> Thanks Pedro !!.  Would you mind explaining this in detail.

See 0865b04a4dec8a458bee54081b5598a6268b0724.

--
Pedro Alves

Attachment: 0001-Patch-microblaze-Use-target_read_code-in-microblaze_.patch
Description: 0001-Patch-microblaze-Use-target_read_code-in-microblaze_.patch