mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-09-05 08:44:14 +02:00
Thomas Huth
6e5716b187
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize now on the __ASSEMBLER__ macro that is provided by the compilers. This is a completely mechanical patch (done with a simple "sed -i" statement). Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260619155733.58852-1-thuth@redhat.com
131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_OBJTOOL_H
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#define _LINUX_OBJTOOL_H
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#include <linux/objtool_types.h>
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#include <linux/annotate.h>
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#ifdef CONFIG_OBJTOOL
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#ifndef __ASSEMBLER__
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#define UNWIND_HINT(type, sp_reg, sp_offset, signal) \
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"987: \n\t" \
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".pushsection .discard.unwind_hints\n\t" \
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ANNOTATE_DATA_SPECIAL "\n\t" \
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/* struct unwind_hint */ \
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".long 987b - .\n\t" \
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".short " __stringify(sp_offset) "\n\t" \
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".byte " __stringify(sp_reg) "\n\t" \
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".byte " __stringify(type) "\n\t" \
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".byte " __stringify(signal) "\n\t" \
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".balign 4 \n\t" \
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".popsection\n\t"
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/*
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* This macro marks the given function's stack frame as "non-standard", which
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* tells objtool to ignore the function when doing stack metadata validation.
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* It should only be used in special cases where you're 100% sure it won't
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* affect the reliability of frame pointers and kernel stack traces.
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*
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* For more information, see tools/objtool/Documentation/objtool.txt.
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*/
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#define STACK_FRAME_NON_STANDARD(func) \
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static void __used __section(".discard.func_stack_frame_non_standard") \
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*__func_stack_frame_non_standard_##func = func
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/*
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* STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore
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* for the case where a function is intentionally missing frame pointer setup,
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* but otherwise needs objtool/ORC coverage when frame pointers are disabled.
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*/
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#ifdef CONFIG_FRAME_POINTER
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#define STACK_FRAME_NON_STANDARD_FP(func) STACK_FRAME_NON_STANDARD(func)
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#else
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#endif
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#define ASM_REACHABLE \
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"998:\n\t" \
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".pushsection .discard.reachable\n\t" \
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".long 998b\n\t" \
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".popsection\n\t"
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#define __ASM_BREF(label) label ## b
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#else /* __ASSEMBLER__ */
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/*
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* In asm, there are two kinds of code: normal C-type callable functions and
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* the rest. The normal callable functions can be called by other code, and
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* don't do anything unusual with the stack. Such normal callable functions
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* are annotated with SYM_FUNC_{START,END}. Most asm code falls in this
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* category. In this case, no special debugging annotations are needed because
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* objtool can automatically generate the ORC data for the ORC unwinder to read
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* at runtime.
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*
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* Anything which doesn't fall into the above category, such as syscall and
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* interrupt handlers, tends to not be called directly by other functions, and
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* often does unusual non-C-function-type things with the stack pointer. Such
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* code needs to be annotated such that objtool can understand it. The
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* following CFI hint macros are for this type of code.
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*
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* These macros provide hints to objtool about the state of the stack at each
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* instruction. Objtool starts from the hints and follows the code flow,
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* making automatic CFI adjustments when it sees pushes and pops, filling out
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* the debuginfo as necessary. It will also warn if it sees any
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* inconsistencies.
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*/
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.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0
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.Lhere_\@:
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.pushsection .discard.unwind_hints
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ANNOTATE_DATA_SPECIAL
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/* struct unwind_hint */
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.long .Lhere_\@ - .
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.short \sp_offset
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.byte \sp_reg
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.byte \type
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.byte \signal
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.balign 4
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.popsection
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.endm
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.macro STACK_FRAME_NON_STANDARD func:req
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.pushsection .discard.func_stack_frame_non_standard, "aw"
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.quad \func
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.popsection
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.endm
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.macro STACK_FRAME_NON_STANDARD_FP func:req
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#ifdef CONFIG_FRAME_POINTER
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STACK_FRAME_NON_STANDARD \func
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#endif
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.endm
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#endif /* __ASSEMBLER__ */
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#else /* !CONFIG_OBJTOOL */
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#ifndef __ASSEMBLER__
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#define UNWIND_HINT(type, sp_reg, sp_offset, signal) "\n\t"
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#define STACK_FRAME_NON_STANDARD(func)
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#define STACK_FRAME_NON_STANDARD_FP(func)
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#else
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.macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 signal=0
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.endm
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.macro STACK_FRAME_NON_STANDARD func:req
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.endm
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#endif
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#endif /* CONFIG_OBJTOOL */
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#if defined(CONFIG_NOINSTR_VALIDATION) && \
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(defined(CONFIG_MITIGATION_UNRET_ENTRY) || defined(CONFIG_MITIGATION_SRSO))
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#define VALIDATE_UNRET_BEGIN ANNOTATE_UNRET_BEGIN
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#else
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#define VALIDATE_UNRET_BEGIN
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#endif
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#endif /* _LINUX_OBJTOOL_H */
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