70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2021 MediaTek Inc.
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*/
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#ifdef __aarch64__
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#include <asm/pointer_auth.h>
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#endif
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#include <asm/stacktrace.h>
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#include "hang_unwind.h"
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unsigned int hang_kernel_trace(struct task_struct *tsk,
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unsigned long *store, unsigned int size)
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{
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struct stackframe frame;
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struct stack_info info;
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unsigned long fp;
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unsigned int store_len = 1;
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if (tsk == current)
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fp = (unsigned long)__builtin_frame_address(0);
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else
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fp = thread_saved_fp(tsk);
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frame.fp = fp;
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frame.pc = thread_saved_pc(tsk);
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if (!frame.pc) {
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pr_info("err stack:%lx\n", thread_saved_sp(tsk));
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return 0;
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}
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*store = frame.pc;
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while(store_len < size) {
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if (!on_task_stack(tsk, fp, 16, &info) || !IS_ALIGNED(fp, 8))
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break;
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frame.fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));
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frame.pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 8));
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fp = frame.fp;
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if (!frame.pc)
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continue;
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#ifdef __aarch64__
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frame.pc = ptrauth_strip_insn_pac(frame.pc);
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#endif
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*(++store) = frame.pc;
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store_len += 1;
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}
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return store_len;
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}
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#ifdef __aarch64__
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const char *hang_arch_vma_name(struct vm_area_struct *vma)
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{
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return NULL;
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}
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#else
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#ifdef MODULE
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const char *hang_arch_vma_name(struct vm_area_struct *vma)
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{
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return NULL;
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}
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#else
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const char *hang_arch_vma_name(struct vm_area_struct *vma)
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{
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return arch_vma_name(vma);
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}
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#endif
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#endif
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