include/linux/objtool_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_OBJTOOL_TYPES_H
   3 #define _LINUX_OBJTOOL_TYPES_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #include <linux/types.h>
   8
   9 /*
  10  * This struct is used by asm and inline asm code to manually annotate the
  11  * location of registers on the stack.
  12  */
  13 struct unwind_hint {
  14         u32             ip;
  15         s16             sp_offset;
  16         u8              sp_reg;
  17         u8              type;
  18         u8              signal;
  19 };
  20
  21 #endif /* __ASSEMBLY__ */
  22
  23 /*
  24  * UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in
  25  * a truncated and unreliable stack unwind.
  26  *
  27  * UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before
  28  * hitting user entry, boot code, or fork entry (when there are no pt_regs
  29  * available).
  30  *
  31  * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP
  32  * (the caller's SP right before it made the call).  Used for all callable
  33  * functions, i.e. all C code and all callable asm functions.
  34  *
  35  * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset
  36  * points to a fully populated pt_regs from a syscall, interrupt, or exception.
  37  *
  38  * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that
  39  * sp_reg+sp_offset points to the iret return frame.
  40  *
  41  * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function.
  42  * Useful for code which doesn't have an ELF function annotation.
  43  *
  44  * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain
  45  * location so that it can be restored later.
  46  */
  47 #define UNWIND_HINT_TYPE_UNDEFINED      0
  48 #define UNWIND_HINT_TYPE_END_OF_STACK   1
  49 #define UNWIND_HINT_TYPE_CALL           2
  50 #define UNWIND_HINT_TYPE_REGS           3
  51 #define UNWIND_HINT_TYPE_REGS_PARTIAL   4
  52 /* The below hint types don't have corresponding ORC types */
  53 #define UNWIND_HINT_TYPE_FUNC           5
  54 #define UNWIND_HINT_TYPE_SAVE           6
  55 #define UNWIND_HINT_TYPE_RESTORE        7
  56
  57 #endif /* _LINUX_OBJTOOL_TYPES_H */