arch/xtensa: Print backtrace on assertions.
Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche
Alan Carvalho de Assis
parent
759b63d4be
commit
9d28687b6f
@ -94,6 +94,20 @@ config XTENSA_CP_INITSET
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is provided by CONFIG_XTENSA_CP_INITSET. Each bit corresponds to one
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coprocessor with the same bit layout as for the CPENABLE register.
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config XTENSA_DUMPBT_ON_ASSERT
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bool "Dump backtrace on assertions"
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default y
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depends on DEBUG_ALERT
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---help---
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Enable a backtrace dump on assertions.
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config XTENSA_BTDEPTH
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int "Backtrace depth"
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default 50
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depends on XTENSA_DUMPBT_ON_ASSERT
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---help---
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This is the depth of the backtrace.
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config XTENSA_USE_SEPARATE_IMEM
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bool "Use a separate heap for internal memory"
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default n
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@ -361,5 +361,9 @@ void xtensa_pminitialize(void);
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void up_stack_color(FAR void *stackbase, size_t nbytes);
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#endif
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#ifdef CONFIG_XTENSA_DUMPBT_ON_ASSERT
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void xtensa_backtrace_start(uint32_t *pc, uint32_t *sp, uint32_t *next_pc);
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_XTENSA_SRC_COMMON_XTENSA_H */
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103
arch/xtensa/src/common/xtensa_backtrace.S
Normal file
103
arch/xtensa/src/common/xtensa_backtrace.S
Normal file
@ -0,0 +1,103 @@
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/****************************************************************************
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* arch/xtensa/src/common/xtensa_dumpstate.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <arch/xtensa/core.h>
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#include <arch/xtensa/xtensa_specregs.h>
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#include "xtensa_abi.h"
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/*
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* This is how the stack looks like when calling the function below:
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*
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* High Addr
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* ..................
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* | i-3 BSA |
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* | i-1 locals | Function B
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* .................. i-1 SP
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* | i-2 BSA |
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* | i locals | Function A (Start of backtrace)
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* ------------------ i SP
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* | i-1 BSA |
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* | i+1 locals | Backtracing function (e.g. xtensa_btdump())
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* ------------------ i+1 SP
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* | i BSA |
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* | i+2 locals | xtensa_backtrace_start()
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* ------------------ i+2 SP
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* | i+1 BSA |
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* | i+3 locals | xtensa_window_spill()
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* ------------------ i+3 SP
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* .................. Low Addr
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*/
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/****************************************************************************
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* Name: xtensa_backtrace_start
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*
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* Description:
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* Get the first frame of the current stack's backtrace
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*
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* Given the following function call flow (B -> A -> X -> xtensa_backtrace_start),
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* this function will do the following:
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* - Flush CPU registers and window frames onto the current stack
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* - Return PC and SP of function A (i.e. start of the stack's backtrace)
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* - Return PC of function B (i.e. next_pc)
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*
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* Input Parameters:
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* pc - PC of the first frame in the backtrace
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* sp - SP of the first frame in the backtrace
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* next_pc - PC of the first frame's caller
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*
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* C callable as:
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* void xtensa_backtrace_start(uint32_t *pc, uint32_t *sp, uint32_t *next_pc)
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*
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****************************************************************************/
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.section .iram1, "ax"
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.global xtensa_backtrace_start
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.type xtensa_backtrace_start, @function
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.align 4
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xtensa_backtrace_start:
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ENTRY(32)
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call8 xtensa_window_spill /* Spill registers onto stack (excluding this
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* function) */
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/* a2, a3, a4 should be out arguments for i SP, i PC, i-1 PC respectively.
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* Use a5 and a6 as scratch.
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*/
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l32e a5, sp, -16 /* Get i PC, which is ret addres of i+1 */
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s32i a5, a2, 0 /* Store i PC to arg *pc */
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l32e a6, sp, -12 /* Get i+1 SP. Used to access i BS */
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l32e a5, a6, -12 /* Get i SP */
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s32i a5, a3, 0 /* Store i SP to arg *sp */
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l32e a5, a6, -16 /* Get i-1 PC, which is ret address of i */
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s32i a5, a4, 0 /* Store i-1 PC to arg *next_pc */
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RET0
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.size xtensa_backtrace_start, . - xtensa_backtrace_start
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@ -32,12 +32,12 @@
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <arch/xtensa/xtensa_corebits.h>
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#include <arch/board/board.h>
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#include <arch/chip/core-isa.h>
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#include "sched/sched.h"
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#include "xtensa.h"
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#include "chip_macros.h"
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#include "chip_memory.h"
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#ifdef CONFIG_DEBUG_ALERT
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@ -150,6 +150,109 @@ static inline void xtensa_registerdump(void)
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#endif
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}
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#ifdef CONFIG_XTENSA_DUMPBT_ON_ASSERT
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/****************************************************************************
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* Name: xtensa_getcause
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****************************************************************************/
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static inline uint32_t xtensa_getcause(void)
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{
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uint32_t cause;
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__asm__ __volatile__
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(
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"rsr %0, EXCCAUSE" : "=r"(cause)
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);
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return cause;
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}
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/****************************************************************************
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* Name: stackpc
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****************************************************************************/
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static inline uint32_t stackpc(uint32_t pc)
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{
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if (pc & 0x80000000)
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{
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/* Top two bits of a0 (return address) specify window increment.
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* Overwrite to map to address space.
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*/
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pc = (pc & 0x3fffffff) | 0x40000000;
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}
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/* Minus 3 to get PC of previous instruction (i.e. instruction executed
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* before return address).
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*/
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return pc - 3;
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}
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/****************************************************************************
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* Name: corruptedframe
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****************************************************************************/
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static inline bool corruptedframe(uint32_t pc, uint32_t sp)
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{
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return !(xtensa_ptr_exec((void *)stackpc(pc)) || xtensa_sp_sane(sp));
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}
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/****************************************************************************
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* Name: nextframe
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****************************************************************************/
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static bool nextframe(uint32_t *pc, uint32_t *sp, uint32_t *npc)
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{
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/* Use frame(i - 1)'s base save area located below frame(i)'s sp to get
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* frame(i - 1)'s sp and frame(i - 2)'s pc. Base save area consists of
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* 4 words under SP.
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*/
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void *bsa = (void *)*sp;
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*pc = *npc;
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*npc = *((uint32_t *)(bsa - 16));
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*sp = *((uint32_t *)(bsa - 12));
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return !corruptedframe(*pc, *sp);
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}
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/****************************************************************************
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* Name: xtensa_btdump
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****************************************************************************/
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static inline void xtensa_btdump(void)
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{
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uint32_t pc;
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uint32_t sp;
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uint32_t npc;
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int i;
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bool corrupted = false;
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xtensa_backtrace_start(&pc, &sp, &npc);
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_alert("Backtrace0: %x:%x\n", stackpc(pc), sp);
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corrupted = corruptedframe(pc, sp) &&
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!(xtensa_getcause() == EXCCAUSE_INSTR_PROHIBITED);
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for (i = 1; i <= CONFIG_XTENSA_BTDEPTH && npc != 0 && !corrupted; i++)
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{
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if (!nextframe(&pc, &sp, &npc))
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{
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corrupted = true;
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}
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_alert("Backtrace%d: %x:%x\n", i, stackpc(pc), sp);
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}
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_alert("BACKTRACE %s\n",
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(corrupted ? "CORRUPTED!" : (npc == 0 ? "Done":"CONTINUES...")));
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}
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#endif /* CONFIG_XTENSA_DUMPBT_ON_ASSERT */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@ -179,6 +282,12 @@ void xtensa_dumpstate(void)
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xtensa_registerdump();
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/* Dump the backtrace */
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#ifdef CONFIG_XTENSA_DUMPBT_ON_ASSERT
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xtensa_btdump();
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#endif
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/* Get the limits on the user stack memory */
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ustackbase = (uint32_t)rtcb->adj_stack_ptr;
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@ -267,4 +376,4 @@ void xtensa_dumpstate(void)
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up_showtasks();
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}
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#endif /* CONFIG_ARCH_STACKDUMP */
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#endif /* CONFIG_DEBUG_ALERT */
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@ -65,6 +65,10 @@ ifeq ($(CONFIG_DEBUG_ALERT),y)
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CMN_CSRCS += xtensa_dumpstate.c
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endif
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ifeq ($(CONFIG_XTENSA_DUMPBT_ON_ASSERT),y)
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CMN_ASRCS += xtensa_backtrace.S
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endif
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ifeq ($(CONFIG_SPINLOCK),y)
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CMN_CSRCS += xtensa_testset.c
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endif
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@ -165,7 +169,6 @@ CHIP_CSRCS += esp32_wtd.c
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endif
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endif
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ifeq ($(CONFIG_ARCH_USE_MODULE_TEXT),y)
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CHIP_CSRCS += esp32_modtext.c
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CMN_ASRCS += xtensa_loadstore.S
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@ -794,6 +794,19 @@ extern int rom_i2c_writeReg(int block, int block_id, int reg_add,
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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Name: esp32_sp_dram
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*
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* Description:
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* Check if the stack pointer is in DRAM.
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*
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****************************************************************************/
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static inline bool IRAM_ATTR esp32_sp_dram(uint32_t sp)
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{
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return (sp >= SOC_DRAM_LOW + 0x10 && sp < SOC_DRAM_HIGH - 0x10);
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}
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/****************************************************************************
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* Name: esp32_ptr_extram
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*
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@ -808,4 +821,24 @@ static inline bool IRAM_ATTR esp32_ptr_extram(const void *p)
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(intptr_t)p < SOC_EXTRAM_DATA_HIGH);
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}
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/****************************************************************************
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* Name: esp32_ptr_exec
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*
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* Description:
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* Check if the pointer is within an executable range.
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*
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****************************************************************************/
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static inline bool IRAM_ATTR esp32_ptr_exec(const void *p)
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{
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intptr_t ip = (intptr_t)p;
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return (ip >= SOC_IROM_LOW && ip < SOC_IROM_HIGH)
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|| (ip >= SOC_IRAM_LOW && ip < SOC_IRAM_HIGH)
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|| (ip >= SOC_IROM_MASK_LOW && ip < SOC_IROM_MASK_HIGH)
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#if defined(SOC_CACHE_APP_LOW) && !defined(CONFIG_SMP)
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|| (ip >= SOC_CACHE_APP_LOW && ip < SOC_CACHE_APP_HIGH)
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#endif
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|| (ip >= SOC_RTC_IRAM_LOW && ip < SOC_RTC_IRAM_HIGH);
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}
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#endif /* __ARCH_XTENSA_SRC_ESP32_HARDWARE_ESP32_SOC_H */
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