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113 lines
2.5 KiB
113 lines
2.5 KiB
/* 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 __ASSEMBLY__ |
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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 /* !__ASSEMBLY__ */ |
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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 /* __ASSEMBLY__ */ |
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#define FRAME_OFFSET __ASM_SEL(4, 8) |
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#else /* !CONFIG_FRAME_POINTER */ |
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#ifdef __ASSEMBLY__ |
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.macro ENCODE_FRAME_POINTER ptregs_offset=0 |
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.endm |
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#else /* !__ASSEMBLY */ |
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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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