include/asm/stacktrace.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __ASM_STACKTRACE_H
0003 #define __ASM_STACKTRACE_H
0004
0005 #include <asm/ptrace.h>
0006 #include <linux/llist.h>
0007
0008 struct stackframe {
0009     /*
0010      * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
0011      * and R11 otherwise.
0012      */
0013     unsigned long fp;
0014     unsigned long sp;
0015     unsigned long lr;
0016     unsigned long pc;
0017
0018     /* address of the LR value on the stack */
0019     unsigned long *lr_addr;
0020 #ifdef CONFIG_KRETPROBES
0021     struct llist_node *kr_cur;
0022     struct task_struct *tsk;
0023 #endif
0024 };
0025
0026 static __always_inline
0027 void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
0028 {
0029         frame->fp = frame_pointer(regs);
0030         frame->sp = regs->ARM_sp;
0031         frame->lr = regs->ARM_lr;
0032         frame->pc = regs->ARM_pc;
0033 #ifdef CONFIG_KRETPROBES
0034         frame->kr_cur = NULL;
0035         frame->tsk = current;
0036 #endif
0037 }
0038
0039 extern int unwind_frame(struct stackframe *frame);
0040 extern void walk_stackframe(struct stackframe *frame,
0041                 int (*fn)(struct stackframe *, void *), void *data);
0042 extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
0043              unsigned long top);
0044
0045 #endif  /* __ASM_STACKTRACE_H */