arch/arm64/include/asm/alternative-asm.h

   1 #ifndef __ASM_ALTERNATIVE_ASM_H
   2 #define __ASM_ALTERNATIVE_ASM_H
   3
   4 #ifdef __ASSEMBLY__
   5
   6 .macro altinstruction_entry orig_offset alt_offset feature orig_len alt_len
   7         .word \orig_offset - .
   8         .word \alt_offset - .
   9         .hword \feature
  10         .byte \orig_len
  11         .byte \alt_len
  12 .endm
  13
  14 .macro alternative_insn insn1 insn2 cap
  15 661:    \insn1
  16 662:    .pushsection .altinstructions, "a"
  17         altinstruction_entry 661b, 663f, \cap, 662b-661b, 664f-663f
  18         .popsection
  19         .pushsection .altinstr_replacement, "ax"
  20 663:    \insn2
  21 664:    .popsection
  22         .if ((664b-663b) != (662b-661b))
  23                 .error "Alternatives instruction length mismatch"
  24         .endif
  25 .endm
  26
  27 #endif  /*  __ASSEMBLY__  */
  28
  29 #endif /* __ASM_ALTERNATIVE_ASM_H */