269 lines
9.5 KiB
C
269 lines
9.5 KiB
C
/*----------------------------------------------------------------------------
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* Tencent is pleased to support the open source community by making TencentOS
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* available.
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*
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* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
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* If you have downloaded a copy of the TencentOS binary from Tencent, please
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* note that the TencentOS binary is licensed under the BSD 3-Clause License.
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*
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* If you have downloaded a copy of the TencentOS source code from Tencent,
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* please note that TencentOS source code is licensed under the BSD 3-Clause
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* License, except for the third-party components listed below which are
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* subject to different license terms. Your integration of TencentOS into your
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* own projects may require compliance with the BSD 3-Clause License, as well
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* as the other licenses applicable to the third-party components included
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* within TencentOS.
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*---------------------------------------------------------------------------*/
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#include "tos_k.h"
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#if TOS_CFG_FAULT_BACKTRACE_EN > 0u
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__STATIC_INLINE__ void fault_spin(void)
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{
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tos_knl_sched_lock();
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tos_cpu_int_disable();
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while (K_TRUE) {
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;
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}
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}
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/* EXC_RETURN:
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31 - 28 : EXC_RETURN flag
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27 - 5 : reserved
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4 : 1, basic stack frame; 0, extended stack frame
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3 : 1, return to Thread mode; 0, return to Handler mode
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2 : 1, return to PSP; 0, return to MSP
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1 : reserved, 0
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0 : reserved, 1
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*/
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__STATIC_INLINE__ int fault_is_on_task(cpu_data_t lr)
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{
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return (lr & (1u << 2)) != 0;
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}
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__STATIC_INLINE__ int fault_is_thumb(cpu_data_t psr)
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{
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return (psr & (1u << 24)) != 0;
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}
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__STATIC_INLINE__ int fault_is_code(fault_info_t *info, cpu_data_t value)
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{
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return value >= info->code_start && value <= info->code_limit;
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}
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#if defined (TOS_CFG_CPU_ARM_FPU_EN) && (TOS_CFG_CPU_ARM_FPU_EN == 1U)
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__STATIC_INLINE__ int fault_is_extended_stack_frame(cpu_data_t lr)
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{
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return (lr & (1u << 4)) == 0;
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}
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__STATIC__ void fault_dump_fpu_frame(fault_fpu_frame_t *fpu_frame)
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{
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/*
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* As known, v7-m has a feature named "LAZY PUSH", for the reason we do not do any float
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* operation in fault_backtrace, cpu will not do the real fpu register push to the stack.
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* that means the value we dump in fault_dump_fpu_frame will not be the correct value of
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* each FPU register.
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* We define a function here which access to FPSCR, if this function involved, cpu will do
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* the real FPU register push so we will get the correct dump.
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* I know it's ugly, but it works. If you know a better way, please tell me.
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*/
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cpu_flush_fpu();
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k_fault_log_writer("\n\n====================== FPU Registers =======================\n");
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k_fault_log_writer(" %s: %08x\n", "FPSCR", fpu_frame->fpscr);
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"S0 ", fpu_frame->s0,
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"S1 ", fpu_frame->s1,
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"S2 ", fpu_frame->s2,
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"S3 ", fpu_frame->s3);
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"S4 ", fpu_frame->s4,
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"S5 ", fpu_frame->s5,
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"S6 ", fpu_frame->s6,
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"S7 ", fpu_frame->s7);
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"S8 ", fpu_frame->s8,
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"S9 ", fpu_frame->s9,
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"S10", fpu_frame->s10,
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"S11", fpu_frame->s11);
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"S12", fpu_frame->s12,
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"S13", fpu_frame->s13,
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"S14", fpu_frame->s14,
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"S15", fpu_frame->s15);
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}
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#endif
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__STATIC__ void fault_dump_cpu_frame(fault_cpu_frame_t *cpu_frame)
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{
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k_fault_log_writer("\n\n====================== CPU Registers =======================\n");
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"R0 ", cpu_frame->r0,
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"R1 ", cpu_frame->r1,
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"R2 ", cpu_frame->r2,
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"R3 ", cpu_frame->r3);
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k_fault_log_writer(" %s: %08x %s: %08x %s: %08x %s: %08x\n",
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"R12", cpu_frame->r12,
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"LR ", cpu_frame->lr,
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"PC ", cpu_frame->pc,
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"PSR", cpu_frame->spsr);
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}
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__STATIC__ void fault_dump_stack(fault_info_t *info, size_t depth)
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{
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cpu_addr_t sp = info->sp_before_fault;
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k_fault_log_writer("\nTASK STACK DUMP:\n");
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while (sp <= info->stack_limit && depth--) {
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k_fault_log_writer(" addr: %08x data: %08x\n", sp, (cpu_data_t)*(cpu_data_t *)sp);
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sp += sizeof(cpu_addr_t);
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}
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}
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__STATIC__ void fault_call_stack_backtrace(fault_info_t *info, size_t depth)
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{
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cpu_data_t value;
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cpu_addr_t sp = info->sp_before_fault;
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if (info->is_stk_ovrf) {
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return;
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}
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k_fault_log_writer("\n\n====================== Dump Call Stack =====================\n");
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k_fault_log_writer(" %x\n", info->pc);
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/* walk through the stack, check every content on stack whether is a instruction(code) */
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for (; sp < info->stack_limit && depth; sp += sizeof(cpu_addr_t)) {
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value = *((cpu_addr_t *)sp) - sizeof(cpu_addr_t);
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/* if thumb, a instruction's first bit must be 1 */
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if (info->is_thumb && !(value & 1)) {
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continue;
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}
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if (fault_is_code(info, value)) {
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k_fault_log_writer(" %x\n", value);
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--depth;
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}
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}
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}
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__STATIC__ void fault_dump_task(fault_info_t *info)
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{
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k_task_t *task;
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if (!info->is_on_task) {
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return;
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}
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task = k_curr_task;
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k_fault_log_writer("\n\n====================== Fault on task =======================\n");
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k_fault_log_writer(" TASK NAME: %s\n", task->name);
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k_fault_log_writer(" STK BASE: %x\n", info->stack_start);
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k_fault_log_writer(" STK SIZE: %x\n", task->stk_size * sizeof(k_stack_t));
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k_fault_log_writer(" STK LIMIT: %x\n", info->stack_limit);
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if (!info->is_stk_ovrf) {
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fault_dump_stack(info, K_FAULT_STACK_DUMP_DEPTH);
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}
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}
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__STATIC__ void fault_dump_information(fault_info_t *info)
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{
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k_fault_log_writer("\n\n================== Dump Fault Information ==================\n");
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k_fault_log_writer(" THUMB: %s\n", info->is_thumb ? "TRUE" : "FALSE");
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k_fault_log_writer(" ON TASK: %s\n", info->is_on_task? "TRUE" : "FALSE");
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k_fault_log_writer(" STK OVRF: %s\n", info->is_stk_ovrf? "TRUE" : "FALSE");
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#if defined (TOS_CFG_CPU_ARM_FPU_EN) && (TOS_CFG_CPU_ARM_FPU_EN == 1U)
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k_fault_log_writer(" EXT STK: %s\n", info->is_ext_stk_frm? "TRUE" : "FALSE");
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#endif
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k_fault_log_writer(" PC: %08x\n", info->pc);
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k_fault_log_writer(" SP: %08x\n", info->sp_before_fault);
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k_fault_log_writer(" STK START: %08x\n", info->stack_start);
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k_fault_log_writer(" STK LIMIT: %08x\n", info->stack_limit);
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k_fault_log_writer(" COD START: %08x\n", info->code_start);
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k_fault_log_writer(" COD LIMIT: %08x\n", info->code_limit);
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}
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__STATIC__ void fault_gather_information(cpu_data_t lr, fault_exc_frame_t *frame, fault_info_t *info)
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{
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info->is_thumb = fault_is_thumb(frame->cpu_frame.spsr);
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info->is_on_task = fault_is_on_task(lr);
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info->pc = frame->cpu_frame.pc;
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info->sp_before_fault = (cpu_addr_t)frame + sizeof(fault_cpu_frame_t);
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#if defined (TOS_CFG_CPU_ARM_FPU_EN) && (TOS_CFG_CPU_ARM_FPU_EN == 1U)
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info->is_ext_stk_frm = fault_is_extended_stack_frame(lr);
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if (info->is_ext_stk_frm) {
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info->sp_before_fault += sizeof(fault_fpu_frame_t);
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}
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#endif
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info->code_start = fault_code_start();
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info->code_limit = fault_code_limit();
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if (info->is_on_task) {
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info->stack_start = (cpu_addr_t)k_curr_task->stk_base;
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info->stack_limit = info->stack_start + k_curr_task->stk_size * sizeof(k_task_t);
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} else {
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info->stack_start = fault_msp_start();
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info->stack_limit = fault_msp_limit();
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}
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info->is_stk_ovrf = (info->sp_before_fault < info->stack_start || info->sp_before_fault > info->stack_limit);
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}
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__KNL__ int fault_default_log_writer(const char *format, ...)
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{
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int len;
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va_list ap;
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va_start(ap, format);
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len = vprintf(format, ap);
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va_end(ap);
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return len;
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}
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__API__ void tos_fault_log_writer_set(k_fault_log_writer_t log_writer)
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{
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k_fault_log_writer = log_writer;
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}
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__KNL__ void fault_backtrace(cpu_addr_t lr, fault_exc_frame_t *frame)
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{
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fault_info_t info;
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fault_gather_information(lr, frame, &info);
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fault_dump_information(&info);
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fault_dump_task(&info);
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fault_dump_cpu_frame(&frame->cpu_frame);
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#if defined (TOS_CFG_CPU_ARM_FPU_EN) && (TOS_CFG_CPU_ARM_FPU_EN == 1U)
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if (info.is_ext_stk_frm) {
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fault_dump_fpu_frame(&frame->fpu_frame);
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}
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#endif
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fault_call_stack_backtrace(&info, K_FAULT_CALL_STACK_BACKTRACE_DEPTH);
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cpu_fault_diagnosis();
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fault_spin();
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}
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#endif
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