/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_OBJTOOL_TYPES_H #define _LINUX_OBJTOOL_TYPES_H #ifndef __ASSEMBLY__ #include <linux/types.h> /* * This struct is used by asm and inline asm code to manually annotate the * location of registers on the stack. */ struct unwind_hint { u32 ip; s16 sp_offset; u8 sp_reg; u8 type; u8 signal; }; #endif /* __ASSEMBLY__ */ /* * UNWIND_HINT_TYPE_UNDEFINED: A blind spot in ORC coverage which can result in * a truncated and unreliable stack unwind. * * UNWIND_HINT_TYPE_END_OF_STACK: The end of the kernel stack unwind before * hitting user entry, boot code, or fork entry (when there are no pt_regs * available). * * UNWIND_HINT_TYPE_CALL: Indicates that sp_reg+sp_offset resolves to PREV_SP * (the caller's SP right before it made the call). Used for all callable * functions, i.e. all C code and all callable asm functions. * * UNWIND_HINT_TYPE_REGS: Used in entry code to indicate that sp_reg+sp_offset * points to a fully populated pt_regs from a syscall, interrupt, or exception. * * UNWIND_HINT_TYPE_REGS_PARTIAL: Used in entry code to indicate that * sp_reg+sp_offset points to the iret return frame. * * UNWIND_HINT_TYPE_FUNC: Generate the unwind metadata of a callable function. * Useful for code which doesn't have an ELF function annotation. * * UNWIND_HINT_TYPE_{SAVE,RESTORE}: Save the unwind metadata at a certain * location so that it can be restored later. */ #define UNWIND_HINT_TYPE_UNDEFINED 0 #define UNWIND_HINT_TYPE_END_OF_STACK 1 #define UNWIND_HINT_TYPE_CALL 2 #define UNWIND_HINT_TYPE_REGS 3 #define UNWIND_HINT_TYPE_REGS_PARTIAL 4 /* The below hint types don't have corresponding ORC types */ #define UNWIND_HINT_TYPE_FUNC 5 #define UNWIND_HINT_TYPE_SAVE 6 #define UNWIND_HINT_TYPE_RESTORE 7 #endif /* _LINUX_OBJTOOL_TYPES_H */