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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_S390_ALTERNATIVE_ASM_H #define _ASM_S390_ALTERNATIVE_ASM_H #ifdef __ASSEMBLY__ /* * Issue one struct alt_instr descriptor entry (need to put it into * the section .altinstructions, see below). This entry contains * enough information for the alternatives patching code to patch an * instruction. See apply_alternatives(). */ .macro alt_entry orig_start, orig_end, alt_start, alt_end, feature .long \orig_start - . .long \alt_start - . .word \feature .byte \orig_end - \orig_start .org . - ( \orig_end - \orig_start ) + ( \alt_end - \alt_start ) .org . - ( \alt_end - \alt_start ) + ( \orig_end - \orig_start ) .endm /* * Define an alternative between two instructions. If @feature is * present, early code in apply_alternatives() replaces @oldinstr with * @newinstr. */ .macro ALTERNATIVE oldinstr, newinstr, feature .pushsection .altinstr_replacement,"ax" 770: \newinstr 771: .popsection 772: \oldinstr 773: .pushsection .altinstructions,"a" alt_entry 772b, 773b, 770b, 771b, \feature .popsection .endm /* * Define an alternative between two instructions. If @feature is * present, early code in apply_alternatives() replaces @oldinstr with * @newinstr. */ .macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 .pushsection .altinstr_replacement,"ax" 770: \newinstr1 771: \newinstr2 772: .popsection 773: \oldinstr 774: .pushsection .altinstructions,"a" alt_entry 773b, 774b, 770b, 771b,\feature1 alt_entry 773b, 774b, 771b, 772b,\feature2 .popsection .endm #endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_ALTERNATIVE_ASM_H */