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      1 /* $NetBSD: asm.h,v 1.9 2020/08/02 06:58:16 maxv Exp $ */
      2 
      3 #ifndef _AARCH64_ASM_H_
      4 #define _AARCH64_ASM_H_
      5 
      6 #if defined(_KERNEL_OPT)
      7 #include "opt_cpuoptions.h"
      8 #endif
      9 
     10 #include <arm/asm.h>
     11 
     12 #ifdef __aarch64__
     13 
     14 #ifdef __ASSEMBLER__
     15 .macro	adrl 	reg, addr
     16 	adrp	\reg, \addr
     17 	add	\reg, \reg, #:lo12:\addr
     18 .endm
     19 #endif
     20 
     21 #define	fp	x29
     22 #define	lr	x30
     23 
     24 /*
     25  * Add a speculation barrier after the 'eret'.
     26  * Some aarch64 cpus speculatively execute instructions after 'eret',
     27  * and this potentiates side-channel attacks.
     28  */
     29 #define	ERET	\
     30 	eret; dsb sy; isb
     31 
     32 /*
     33  * ARMv8 options to be made available for the compiler to use. Should be
     34  * inserted at the beginning of the ASM files that need them.
     35  *
     36  * The options are:
     37  *  - PAN, needed for the compiler to recognize the PAN register.
     38  *  - PAC, needed for the compiler to recognize the key registers.
     39  */
     40 #ifdef ARMV83_PAC
     41 #define ARMV8_DEFINE_OPTIONS	\
     42 	.arch armv8.3-a
     43 #elif defined(ARMV81_PAN)
     44 #define ARMV8_DEFINE_OPTIONS	\
     45 	.arch armv8.1-a
     46 #else
     47 #define ARMV8_DEFINE_OPTIONS	/* nothing */
     48 #endif
     49 
     50 #endif
     51 
     52 #endif /* !_AARCH64_ASM_H_ */
     53