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arch/xtensa/src/common/xtensa_backtrace.S: Update the comments to show

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the functions in play during the backtrace.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche 2020-11-27 10:27:36 +00:00 committed by Alan Carvalho de Assis
parent 0c05f2ea38
commit 716a29ebeb
1 changed files with 6 additions and 5 deletions
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11
arch/xtensa/src/common/xtensa_backtrace.S
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@ -30,18 +30,19 @@
#include "xtensa_abi.h" #include "xtensa_abi.h"
/* /*
* This is how the stack looks like when calling the function below: * This is how the call stack looks like when calling the function below
* from xtensa_dumpstate():
* *
* High Addr * High Addr
* .................. * ..................
* | i-3 BSA | * | i-3 BSA |
* | i-1 locals | Function B * | i-1 locals | xtensa_assert()
* .................. i-1 SP * .................. i-1 SP
* | i-2 BSA | * | i-2 BSA |
* | i locals | Function A (Start of backtrace) * | i locals | xtensa_dumpstate()
* ------------------ i SP * ------------------ i SP
* | i-1 BSA | * | i-1 BSA |
* | i+1 locals | Backtracing function (e.g. xtensa_btdump()) * | i+1 locals | xtensa_btdump()
* ------------------ i+1 SP * ------------------ i+1 SP
* | i BSA | * | i BSA |
* | i+2 locals | xtensa_backtrace_start() * | i+2 locals | xtensa_backtrace_start()
@ -56,7 +57,7 @@
* Name: xtensa_backtrace_start * Name: xtensa_backtrace_start
* *
* Description: * Description:
* Get the first frame of the current stack's backtrace * Get the first frame of the current stack's backtrace.
* *
* Given the following function call flow (B -> A -> X -> xtensa_backtrace_start), * Given the following function call flow (B -> A -> X -> xtensa_backtrace_start),
* this function will do the following: * this function will do the following: