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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_OBJTOOL_H#define _LINUX_OBJTOOL_H
#include <linux/objtool_types.h>#include <linux/annotate.h>
#ifdef CONFIG_OBJTOOL
#ifndef __ASSEMBLER__
#define UNWIND_HINT(type, sp_reg, sp_offset, signal) \ "987: \n\t" \ ".pushsection .discard.unwind_hints\n\t" \ ANNOTATE_DATA_SPECIAL "\n\t" \ /* struct unwind_hint */ \ ".long 987b - .\n\t" \ ".short " __stringify(sp_offset) "\n\t" \ ".byte " __stringify(sp_reg) "\n\t" \ ".byte " __stringify(type) "\n\t" \ ".byte " __stringify(signal) "\n\t" \ ".balign 4 \n\t" \ ".popsection\n\t"
/* * This macro marks the given function's stack frame as "non-standard", which * tells objtool to ignore the function when doing stack metadata validation. * It should only be used in special cases where you're 100% sure it won't * affect the reliability of frame pointers and kernel stack traces. * * For more information, see tools/objtool/Documentation/objtool.txt. */#define STACK_FRAME_NON_STANDARD(func) \ static void __used __section(".discard.func_stack_frame_non_standard") \ *__func_stack_frame_non_standard_##func = func
/* * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore * for the case where a function is intentionally missing frame pointer setup, * but otherwise needs objtool/ORC coverage when frame pointers are disabled. */#ifdef CONFIG_FRAME_POINTER#define STACK_FRAME_NON_STANDARD_FP(func) STACK_FRAME_NON_STANDARD(func)#else#define STACK_FRAME_NON_STANDARD_FP(func)#endif
#define ASM_REACHABLE \ "998:\n\t" \ ".pushsection .discard.reachable\n\t" \ ".long 998b\n\t" \ ".popsection\n\t"
#define __ASM_BREF(label) label ## b
#else /* __ASSEMBLER__ */
/* * In asm, there are two kinds of code: normal C-type callable functions and * the rest. The normal callable functions can be called by other code, and * don't do anything unusual with the stack. Such normal callable functions * are annotated with SYM_FUNC_{START,END}. Most asm code falls in this * category. In this case, no special debugging annotations are needed because * objtool can automatically generate the ORC data for the ORC unwinder to read * at runtime. * * Anything which doesn't fall into the above category, such as syscall and * interrupt handlers, tends to not be called directly by other functions, and * often does unusual non-C-function-type things with the stack pointer. Such * code needs to be annotated such that objtool can understand it. The * following CFI hint macros are for this type of code. * * These macros provide hints to objtool about the state of the stack at each * instruction. Objtool starts from the hints and follows the code flow, * making automatic CFI adjustments when it sees pushes and pops, filling out * the debuginfo as necessary. It will also warn if it sees any * inconsistencies. */.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0.Lhere_\@: .pushsection .discard.unwind_hints ANNOTATE_DATA_SPECIAL /* struct unwind_hint */ .long .Lhere_\@ - . .short \sp_offset .byte \sp_reg .byte \type .byte \signal .balign 4 .popsection.endm
.macro STACK_FRAME_NON_STANDARD func:req .pushsection .discard.func_stack_frame_non_standard, "aw" .quad \func .popsection.endm
.macro STACK_FRAME_NON_STANDARD_FP func:req#ifdef CONFIG_FRAME_POINTER STACK_FRAME_NON_STANDARD \func#endif.endm
#endif /* __ASSEMBLER__ */
#else /* !CONFIG_OBJTOOL */
#ifndef __ASSEMBLER__
#define UNWIND_HINT(type, sp_reg, sp_offset, signal) "\n\t"#define STACK_FRAME_NON_STANDARD(func)#define STACK_FRAME_NON_STANDARD_FP(func)#else.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0.endm.macro STACK_FRAME_NON_STANDARD func:req.endm#endif
#endif /* CONFIG_OBJTOOL */
#if defined(CONFIG_NOINSTR_VALIDATION) && \ (defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))#define VALIDATE_UNRET_BEGIN ANNOTATE_UNRET_BEGIN#else#define VALIDATE_UNRET_BEGIN#endif
#endif /* _LINUX_OBJTOOL_H */