/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_COMPILER_H #define __ASM_COMPILER_H #ifdef ARM64_ASM_ARCH #define ARM64_ASM_PREAMBLE ".arch " ARM64_ASM_ARCH "\n" #else #define ARM64_ASM_PREAMBLE #endif /* * The EL0/EL1 pointer bits used by a pointer authentication code. * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply. */ #define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual) #define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual) /* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */ #define ptrauth_clear_pac(ptr) \ ((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) : \ (ptr & ~ptrauth_user_pac_mask())) #define __builtin_return_address(val) \ (void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val))) #ifdef CONFIG_CFI_CLANG /* * With CONFIG_CFI_CLANG, the compiler replaces function address * references with the address of the function's CFI jump table * entry. The function_nocfi macro always returns the address of the * actual function instead. */ #define function_nocfi(x) ({ \ void *addr; \ asm("adrp %0, " __stringify(x) "\n\t" \ "add %0, %0, :lo12:" __stringify(x) \ : "=r" (addr)); \ addr; \ }) #endif #endif /* __ASM_COMPILER_H */