text: #ifndef __ASM_LINKAGE_H
  #define __ASM_LINKAGE_H
  
  #ifdef __ASSEMBLY__
  #include <asm/assembler.h>
  #endif
  
  #define __ALIGN		.align 2
  #define __ALIGN_STR	".align 2"
  
  /*
   * When using in-kernel BTI we need to ensure that PCS-conformant
   * assembly functions have suitable annotations.  Override
   * SYM_FUNC_START to insert a BTI landing pad at the start of
   * everything, the override is done unconditionally so we're more
   * likely to notice any drift from the overridden definitions.
   */
  #define SYM_FUNC_START(name)				\
  	SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)	\
  	bti c ;
  
  #define SYM_FUNC_START_NOALIGN(name)			\
  	SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE)	\
  	bti c ;
  
  #define SYM_FUNC_START_LOCAL(name)			\
  	SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)	\
  	bti c ;
  
  #define SYM_FUNC_START_LOCAL_NOALIGN(name)		\
  	SYM_START(name, SYM_L_LOCAL, SYM_A_NONE)	\
  	bti c ;
  
  #define SYM_FUNC_START_WEAK(name)			\
  	SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)	\
  	bti c ;
  
  #define SYM_FUNC_START_WEAK_NOALIGN(name)		\
  	SYM_START(name, SYM_L_WEAK, SYM_A_NONE)		\
  	bti c ;
  
  /*
   * Annotate a function as position independent, i.e., safe to be called before
   * the kernel virtual mapping is activated.
   */
  #define SYM_FUNC_START_PI(x)			\
  		SYM_FUNC_START_ALIAS(__pi_##x);	\
  		SYM_FUNC_START(x)
  
  #define SYM_FUNC_START_WEAK_PI(x)		\
  		SYM_FUNC_START_ALIAS(__pi_##x);	\
  		SYM_FUNC_START_WEAK(x)
  
  #define SYM_FUNC_START_WEAK_ALIAS_PI(x)		\
  		SYM_FUNC_START_ALIAS(__pi_##x);	\
  		SYM_START(x, SYM_L_WEAK, SYM_A_ALIGN)
  
  #define SYM_FUNC_END_PI(x)			\
  		SYM_FUNC_END(x);		\
  		SYM_FUNC_END_ALIAS(__pi_##x)
  
  #define SYM_FUNC_END_ALIAS_PI(x)		\
  		SYM_FUNC_END_ALIAS(x);		\
  		SYM_FUNC_END_ALIAS(__pi_##x)
  
  #endif
  