1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_STACKTRACE_H 3 #define __ASM_STACKTRACE_H 4 5 #include <asm/ptrace.h> 6 #include <linux/llist.h> 7 8 struct stackframe { 9 /* 10 * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled 11 * and R11 otherwise. 12 */ 13 unsigned long fp; 14 unsigned long sp; 15 unsigned long lr; 16 unsigned long pc; 17 18 /* address of the LR value on the stack */ 19 unsigned long *lr_addr; 20 #ifdef CONFIG_KRETPROBES 21 struct llist_node *kr_cur; 22 struct task_struct *tsk; 23 #endif 24 #ifdef CONFIG_UNWINDER_FRAME_POINTER 25 bool ex_frame; 26 #endif 27 }; 28 on_thread_stack(void)29 static inline bool on_thread_stack(void) 30 { 31 unsigned long delta = current_stack_pointer ^ (unsigned long)current->stack; 32 33 return delta < THREAD_SIZE; 34 } 35 36 static __always_inline arm_get_current_stackframe(struct pt_regs * regs,struct stackframe * frame)37 void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame) 38 { 39 frame->fp = frame_pointer(regs); 40 frame->sp = regs->ARM_sp; 41 frame->lr = regs->ARM_lr; 42 frame->pc = regs->ARM_pc; 43 #ifdef CONFIG_KRETPROBES 44 frame->kr_cur = NULL; 45 frame->tsk = current; 46 #endif 47 #ifdef CONFIG_UNWINDER_FRAME_POINTER 48 frame->ex_frame = in_entry_text(frame->pc); 49 #endif 50 } 51 52 extern int unwind_frame(struct stackframe *frame); 53 extern void walk_stackframe(struct stackframe *frame, 54 bool (*fn)(void *, unsigned long), void *data); 55 extern void dump_mem(const char *lvl, const char *str, unsigned long bottom, 56 unsigned long top); 57 extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, 58 const char *loglvl); 59 60 #endif /* __ASM_STACKTRACE_H */ 61