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https://gitee.com/bianbu-linux/linux-6.6
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70ccc7c066
As with the generic arch_stack_walk() code the ARM stack walk code takes a callback that is called per stack frame. Currently the ARM code always passes a struct stackframe to the callback and the generic code just passes the pc, however none of the users ever reference anything in the struct other than the pc value. The ARM code also uses a return type of int while the generic code uses a return type of bool though in both cases the return value is a boolean value and the sense is inverted between the two. In order to reduce code duplication when ARM is converted to use arch_stack_walk() change the signature and return sense of the ARM specific callback to match that of the generic code. Signed-off-by: Li Huafei <lihuafei1@huawei.com> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Linus Waleij <linus.walleij@linaro.org> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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#include <asm/ptrace.h>
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#include <linux/llist.h>
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struct stackframe {
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/*
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* FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
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* and R11 otherwise.
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*/
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unsigned long fp;
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unsigned long sp;
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unsigned long lr;
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unsigned long pc;
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/* address of the LR value on the stack */
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unsigned long *lr_addr;
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#ifdef CONFIG_KRETPROBES
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struct llist_node *kr_cur;
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struct task_struct *tsk;
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#endif
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#ifdef CONFIG_UNWINDER_FRAME_POINTER
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bool ex_frame;
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#endif
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};
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static __always_inline
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void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
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{
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frame->fp = frame_pointer(regs);
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frame->sp = regs->ARM_sp;
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frame->lr = regs->ARM_lr;
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frame->pc = regs->ARM_pc;
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#ifdef CONFIG_KRETPROBES
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frame->kr_cur = NULL;
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frame->tsk = current;
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#endif
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#ifdef CONFIG_UNWINDER_FRAME_POINTER
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frame->ex_frame = in_entry_text(frame->pc);
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#endif
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}
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extern int unwind_frame(struct stackframe *frame);
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extern void walk_stackframe(struct stackframe *frame,
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bool (*fn)(void *, unsigned long), void *data);
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extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
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unsigned long top);
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extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
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const char *loglvl);
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#endif /* __ASM_STACKTRACE_H */
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