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9865f1d46a
Currently there are numerous places where "struct pt_regs" are used to populate "struct stackframe", however all of those location do not consider the situation where the kernel might be compiled in THUMB2 mode, in which case the framepointer member of pt_regs become ARM_r7 instead of ARM_fp (r11). Document this idiosyncracy in the definition of "struct stackframe" The easiest solution is to introduce a new function (in the spirit of https://groups.google.com/forum/#!topic/linux.kernel/dA2YuUcSpZ4) which would hide the complexity of initializing the stackframe struct from pt_regs. Also implement a macro frame_pointer(regs) that would return the correct register so that we can use it in cases where we just require the frame pointer and not a whole struct stackframe Signed-off-by: Nikolay Borisov <Nikolay.Borisov@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Robert Richter <rric@kernel.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
31 lines
703 B
C
31 lines
703 B
C
#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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#include <asm/ptrace.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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};
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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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}
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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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int (*fn)(struct stackframe *, void *), void *data);
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#endif /* __ASM_STACKTRACE_H */
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