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Discussion Groups
Discussion Groups | TMS320C6x | Fw: Break Points
Technical discussions about the TI C6000 DSPs (including the c62x, c64x and c67x DSPs).
Fw: Break Points - Ganesh Vijayan - Jul 2 12:13:00 2003
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----- Original Message -----
From: Bhooshan iyer
To: g...@emuzed.com
Sent: Wednesday, July 02, 2003 5:35 PM
Subject: Re: [c6x] Break Points Omer,
Why are you doing this to get a function
profile? that can be got from the profiler without using any break point...refer the tutorial
on function profile or refer rulph chassaings c6x dsk book 1st chapter for more info on
function profiling...anyways...
One thing you might want to keep in your
mind abt breakpoints is that they are not actually done at C level but rather at assembly level
in the sense the break-points are actually set on a particular (single) assembly language
statement.
So you have to stop placing the break point from the C source view,instead use the
mixed/source asm mode under the view menu...now you will know which are the valid lines(find
out the invalid lines for break-points placing) in which the break point can be
placed...
the break point manager is actually moving your break point to the next valid line in the
assembly code...
because break point manager will not allow you to place a Bkpoint in between two pipelined
instructions(quite obviously this will ruin the pipeline...)and so forth...dont be fooled into
thinking that you are actually placing the break point on the c statement say,
sum += a[i] * b[i];
you are actually placing the break point at the first line of the assembly equivalent of
the above line say,
LDH .D2T2 *+SP(20),B6 ; |22| LDW .D2T2 *+SP(8),B5 ; |22| LDW .D2T2 *+SP(4),B9 ; |22| LDH .D2T2 *+SP(20),B4 ; |22| LDH .D2T2 *+SP(20),B7 ; |22| LDW .D2T2 *+SP(16),B8 ; |22| NOP 2 LDH .D2T2 *+B5[B6],B5 ; |22| LDH .D2T2 *+B9[B4],B4 ; |22| || ADD .S2 1,B7,B6 ; |22| STH .D2T2 B6,*+SP(20) ; |22| LDW .D2T2 *+SP(12),B7 ; |22| LDH .D2T2 *+SP(20),B6 ; |22| NOP 4 CMPLT .L2 B6,B7,B0 ; |22| [ B0] B .S1 L1 ; |22| MPY .M2 B5,B4,B4 ; |22| NOP 2 ADD .D2 B4,B8,B4 ; |22| STW .D2T2 B4,*+SP(16) ; |22| ; BRANCH OCCURS ; |22|
Bhooshan Attention NRIs! Send money home in a jiffy. Find out how here. |
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