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24a295e4ef
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 on the __ASSEMBLER__ macro that is provided by the compilers now. This is mostly a mechanical patch (done with a simple "sed -i" statement), with some manual tweaks in <asm/frame.h>, <asm/hw_irq.h> and <asm/setup.h> that mentioned this macro in comments with some missing underscores. Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250314071013.1575167-38-thuth@redhat.com
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_FRAME_H
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#define _ASM_X86_FRAME_H
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#include <asm/asm.h>
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/*
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* These are stack frame creation macros. They should be used by every
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* callable non-leaf asm function to make kernel stack traces more reliable.
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*/
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#ifdef CONFIG_FRAME_POINTER
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#ifdef __ASSEMBLER__
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.macro FRAME_BEGIN
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push %_ASM_BP
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_ASM_MOV %_ASM_SP, %_ASM_BP
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.endm
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.macro FRAME_END
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pop %_ASM_BP
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.endm
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#ifdef CONFIG_X86_64
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/*
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* This is a sneaky trick to help the unwinder find pt_regs on the stack. The
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* frame pointer is replaced with an encoded pointer to pt_regs. The encoding
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* is just setting the LSB, which makes it an invalid stack address and is also
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* a signal to the unwinder that it's a pt_regs pointer in disguise.
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*
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* NOTE: This macro must be used *after* PUSH_AND_CLEAR_REGS because it corrupts
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* the original rbp.
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*/
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.macro ENCODE_FRAME_POINTER ptregs_offset=0
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leaq 1+\ptregs_offset(%rsp), %rbp
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.endm
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#else /* !CONFIG_X86_64 */
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/*
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* This is a sneaky trick to help the unwinder find pt_regs on the stack. The
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* frame pointer is replaced with an encoded pointer to pt_regs. The encoding
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* is just clearing the MSB, which makes it an invalid stack address and is also
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* a signal to the unwinder that it's a pt_regs pointer in disguise.
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*
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* NOTE: This macro must be used *after* SAVE_ALL because it corrupts the
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* original ebp.
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*/
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.macro ENCODE_FRAME_POINTER
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mov %esp, %ebp
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andl $0x7fffffff, %ebp
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.endm
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#endif /* CONFIG_X86_64 */
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#else /* !__ASSEMBLER__ */
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#define FRAME_BEGIN \
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"push %" _ASM_BP "\n" \
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_ASM_MOV "%" _ASM_SP ", %" _ASM_BP "\n"
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#define FRAME_END "pop %" _ASM_BP "\n"
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#ifdef CONFIG_X86_64
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#define ENCODE_FRAME_POINTER \
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"lea 1(%rsp), %rbp\n\t"
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static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
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{
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return (unsigned long)regs + 1;
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}
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#else /* !CONFIG_X86_64 */
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#define ENCODE_FRAME_POINTER \
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"movl %esp, %ebp\n\t" \
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"andl $0x7fffffff, %ebp\n\t"
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static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
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{
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return (unsigned long)regs & 0x7fffffff;
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}
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#endif /* CONFIG_X86_64 */
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#endif /* __ASSEMBLER__ */
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#define FRAME_OFFSET __ASM_SEL(4, 8)
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#else /* !CONFIG_FRAME_POINTER */
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#ifdef __ASSEMBLER__
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.macro ENCODE_FRAME_POINTER ptregs_offset=0
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.endm
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#else /* !__ASSEMBLER__ */
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#define ENCODE_FRAME_POINTER
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static inline unsigned long encode_frame_pointer(struct pt_regs *regs)
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{
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return 0;
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}
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#endif
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#define FRAME_BEGIN
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#define FRAME_END
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#define FRAME_OFFSET 0
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#endif /* CONFIG_FRAME_POINTER */
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#endif /* _ASM_X86_FRAME_H */
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