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The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could unwind the stack with: fp = *fp lr = (unsigned int *)fp[1] Signed-off-by: Guo Ren <ren_guo@c-sky.com>
141 lines
3 KiB
C
141 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/sched/debug.h>
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#include <linux/delay.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/ptrace.h>
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#include <asm/elf.h>
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#include <abi/reg_ops.h>
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struct cpuinfo_csky cpu_data[NR_CPUS];
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asmlinkage void ret_from_fork(void);
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asmlinkage void ret_from_kernel_thread(void);
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/*
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* Some archs flush debug and FPU info here
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*/
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void flush_thread(void){}
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/*
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* Return saved PC from a blocked thread
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*/
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
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return sw->r15;
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}
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int copy_thread(unsigned long clone_flags,
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unsigned long usp,
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unsigned long kthread_arg,
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struct task_struct *p)
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{
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struct switch_stack *childstack;
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struct pt_regs *childregs = task_pt_regs(p);
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#ifdef CONFIG_CPU_HAS_FPU
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save_to_user_fp(&p->thread.user_fp);
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#endif
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childstack = ((struct switch_stack *) childregs) - 1;
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memset(childstack, 0, sizeof(struct switch_stack));
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/* setup ksp for switch_to !!! */
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p->thread.ksp = (unsigned long)childstack;
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if (unlikely(p->flags & PF_KTHREAD)) {
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memset(childregs, 0, sizeof(struct pt_regs));
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childstack->r15 = (unsigned long) ret_from_kernel_thread;
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childstack->r8 = kthread_arg;
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childstack->r9 = usp;
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childregs->sr = mfcr("psr");
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} else {
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*childregs = *(current_pt_regs());
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if (usp)
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childregs->usp = usp;
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if (clone_flags & CLONE_SETTLS)
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task_thread_info(p)->tp_value = childregs->tls
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= childregs->regs[0];
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childregs->a0 = 0;
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childstack->r15 = (unsigned long) ret_from_fork;
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}
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return 0;
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}
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/* Fill in the fpu structure for a core dump. */
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int dump_fpu(struct pt_regs *regs, struct user_fp *fpu)
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{
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memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
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return 1;
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}
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EXPORT_SYMBOL(dump_fpu);
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int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
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{
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struct pt_regs *regs = task_pt_regs(tsk);
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/* NOTE: usp is error value. */
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ELF_CORE_COPY_REGS((*pr_regs), regs)
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return 1;
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long lr;
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unsigned long *fp, *stack_start, *stack_end;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_start = (unsigned long *)end_of_stack(p);
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stack_end = (unsigned long *)(task_stack_page(p) + THREAD_SIZE);
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fp = (unsigned long *) thread_saved_fp(p);
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do {
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if (fp < stack_start || fp > stack_end)
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return 0;
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#ifdef CONFIG_STACKTRACE
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lr = fp[1];
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fp = (unsigned long *)fp[0];
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#else
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lr = *fp++;
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#endif
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if (!in_sched_functions(lr) &&
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__kernel_text_address(lr))
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return lr;
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} while (count++ < 16);
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return 0;
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}
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EXPORT_SYMBOL(get_wchan);
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#ifndef CONFIG_CPU_PM_NONE
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void arch_cpu_idle(void)
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{
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#ifdef CONFIG_CPU_PM_WAIT
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asm volatile("wait\n");
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#endif
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#ifdef CONFIG_CPU_PM_DOZE
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asm volatile("doze\n");
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#endif
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#ifdef CONFIG_CPU_PM_STOP
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asm volatile("stop\n");
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#endif
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local_irq_enable();
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}
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#endif
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