linkage.h

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#ifndef __ASM_LINKAGE_H
#define __ASM_LINKAGE_H
 
#ifdef __ASSEMBLER__
#include <asm/assembler.h>
#endif
 
#define __ALIGN     .balign CONFIG_FUNCTION_ALIGNMENT
#define __ALIGN_STR ".balign " #CONFIG_FUNCTION_ALIGNMENT
 
/*
 * 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 ;
 
#define SYM_TYPED_FUNC_START(name)              \
    SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)    \
    bti c ;
 
#define _THIS_IP_ ({ unsigned long __ip; asm volatile("adr %0, ." : "=r" (__ip)); __ip; })
 
#define __bss_pgtbl __section(".bss..pgtbl") __aligned(PAGE_SIZE)
 
#endif