54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* Copyright (c) 2020 Institute of Parallel And Distributed Systems (IPADS), Shanghai Jiao Tong University (SJTU)
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* OS-Lab-2020 (i.e., ChCore) is licensed under the Mulan PSL v1.
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* You can use this software according to the terms and conditions of the Mulan PSL v1.
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* You may obtain a copy of Mulan PSL v1 at:
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* http://license.coscl.org.cn/MulanPSL
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
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* PURPOSE.
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* See the Mulan PSL v1 for more details.
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*/
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// Simple command-line kernel monitor useful for
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// controlling the kernel and exploring the system interactively.
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#include <common/printk.h>
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#include <common/types.h>
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#include <common/machine.h>
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extern char kernel_stack[PLAT_CPU_NUM][KERNEL_STACK_SIZE];
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static inline __attribute__ ((always_inline))
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u64 read_fp()
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{
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u64 fp;
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__asm __volatile("mov %0, x29":"=r"(fp));
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return fp;
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}
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__attribute__ ((optimize("O1")))
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int stack_backtrace()
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{
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printk("Stack backtrace:\n");
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// Your code here.
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u64 *fp, *preFp;
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fp = read_fp();
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// until stack end
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while (true) {
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preFp = *fp;
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// entry frame
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if (preFp == 0)
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break;
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printk("LR %lx FP %lx Args", *(preFp + 1), preFp);
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for (int i = 0; i < 5; i++) {
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printk(" %lx", *(fp + 2 + i));
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}
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printk("\n");
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fp = preFp;
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}
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return 0;
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}
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