arch/arm64/include/asm/stacktrace/frame.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ASM_STACKTRACE_FRAME_H
   3 #define __ASM_STACKTRACE_FRAME_H
   4
   5 /*
   6  * - FRAME_META_TYPE_NONE
   7  *
   8  *   This value is reserved.
   9  *
  10  * - FRAME_META_TYPE_FINAL
  11  *
  12  *   The record is the last entry on the stack.
  13  *   Unwinding should terminate successfully.
  14  *
  15  * - FRAME_META_TYPE_PT_REGS
  16  *
  17  *   The record is embedded within a struct pt_regs, recording the registers at
  18  *   an arbitrary point in time.
  19  *   Unwinding should consume pt_regs::pc, followed by pt_regs::lr.
  20  *
  21  * Note: all other values are reserved and should result in unwinding
  22  * terminating with an error.
  23  */
  24 #define FRAME_META_TYPE_NONE            0
  25 #define FRAME_META_TYPE_FINAL           1
  26 #define FRAME_META_TYPE_PT_REGS         2
  27
  28 #ifndef __ASSEMBLY__
  29 /*
  30  * A standard AAPCS64 frame record.
  31  */
  32 struct frame_record {
  33         u64 fp;
  34         u64 lr;
  35 };
  36
  37 /*
  38  * A metadata frame record indicating a special unwind.
  39  * The record::{fp,lr} fields must be zero to indicate the presence of
  40  * metadata.
  41  */
  42 struct frame_record_meta {
  43         struct frame_record record;
  44         u64 type;
  45 };
  46 #endif /* __ASSEMBLY */
  47
  48 #endif /* __ASM_STACKTRACE_FRAME_H */