4ab6827081
The existing code that dumps the contents of the pt_regs structure passed to __entry routines does so while unwinding the callee frame, and dereferences the stack pointer as a struct pt_regs*. This will no longer work when we enable support for IRQ or overflow stacks, because the struct pt_regs may live on the task stack, while we are executing from another stack. The unwinder has access to this information, but only while unwinding the calling frame. So let's combine the exception stack dumping code with the handling of the calling frame as well. By printing it before dumping the caller/callee addresses, the output order is preserved. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Keith Packard <keithpac@amazon.com> Tested-by: Marc Zyngier <maz@kernel.org> Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_STACKTRACE_H
|
|
#define __ASM_STACKTRACE_H
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <linux/llist.h>
|
|
|
|
struct stackframe {
|
|
/*
|
|
* FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
|
|
* and R11 otherwise.
|
|
*/
|
|
unsigned long fp;
|
|
unsigned long sp;
|
|
unsigned long lr;
|
|
unsigned long pc;
|
|
#ifdef CONFIG_KRETPROBES
|
|
struct llist_node *kr_cur;
|
|
struct task_struct *tsk;
|
|
#endif
|
|
#ifdef CONFIG_ARM_UNWIND
|
|
/*
|
|
* This field is used to track the stack pointer value when calling
|
|
* __entry routines. This is needed when IRQ stacks and overflow stacks
|
|
* are used, because in that case, the struct pt_regs passed to these
|
|
* __entry routines may be at the top of the task stack, while we are
|
|
* executing from another stack.
|
|
*/
|
|
unsigned long sp_low;
|
|
#endif
|
|
};
|
|
|
|
static __always_inline
|
|
void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
|
|
{
|
|
frame->fp = frame_pointer(regs);
|
|
frame->sp = regs->ARM_sp;
|
|
frame->lr = regs->ARM_lr;
|
|
frame->pc = regs->ARM_pc;
|
|
#ifdef CONFIG_KRETPROBES
|
|
frame->kr_cur = NULL;
|
|
frame->tsk = current;
|
|
#endif
|
|
}
|
|
|
|
extern int unwind_frame(struct stackframe *frame);
|
|
extern void walk_stackframe(struct stackframe *frame,
|
|
int (*fn)(struct stackframe *, void *), void *data);
|
|
extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
|
|
unsigned long top);
|
|
|
|
#endif /* __ASM_STACKTRACE_H */
|