57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_COMPILER_H
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#define __ASM_COMPILER_H
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#ifdef ARM64_ASM_ARCH
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#define ARM64_ASM_PREAMBLE ".arch " ARM64_ASM_ARCH "\n"
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#else
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#define ARM64_ASM_PREAMBLE
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#endif
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#define xpaclri(ptr) \
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({ \
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register unsigned long __xpaclri_ptr asm("x30") = (ptr); \
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\
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asm( \
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ARM64_ASM_PREAMBLE \
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" hint #7\n" \
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: "+r" (__xpaclri_ptr)); \
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\
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__xpaclri_ptr; \
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})
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#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
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#define ptrauth_strip_kernel_insn_pac(ptr) xpaclri(ptr)
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#else
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#define ptrauth_strip_kernel_insn_pac(ptr) (ptr)
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#endif
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#ifdef CONFIG_ARM64_PTR_AUTH
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#define ptrauth_strip_user_insn_pac(ptr) xpaclri(ptr)
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#else
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#define ptrauth_strip_user_insn_pac(ptr) (ptr)
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#endif
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#if !defined(CONFIG_BUILTIN_RETURN_ADDRESS_STRIPS_PAC)
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#define __builtin_return_address(val) \
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(void *)(ptrauth_strip_kernel_insn_pac((unsigned long)__builtin_return_address(val)))
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#endif
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#ifdef CONFIG_CFI_CLANG
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/*
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* With CONFIG_CFI_CLANG, the compiler replaces function address
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* references with the address of the function's CFI jump table
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* entry. The function_nocfi macro always returns the address of the
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* actual function instead.
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*/
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#define function_nocfi(x) ({ \
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void *addr; \
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asm("adrp %0, " __stringify(x) "\n\t" \
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"add %0, %0, :lo12:" __stringify(x) \
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: "=r" (addr)); \
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addr; \
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})
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#endif
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#endif /* __ASM_COMPILER_H */
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