1fba9eb79SMartin Schwidefsky /* SPDX-License-Identifier: GPL-2.0 */ 2fba9eb79SMartin Schwidefsky #ifndef _ASM_S390_ALTERNATIVE_ASM_H 3fba9eb79SMartin Schwidefsky #define _ASM_S390_ALTERNATIVE_ASM_H 4fba9eb79SMartin Schwidefsky 5fba9eb79SMartin Schwidefsky #ifdef __ASSEMBLY__ 6fba9eb79SMartin Schwidefsky 7fba9eb79SMartin Schwidefsky /* 8fba9eb79SMartin Schwidefsky * Issue one struct alt_instr descriptor entry (need to put it into 9fba9eb79SMartin Schwidefsky * the section .altinstructions, see below). This entry contains 10fba9eb79SMartin Schwidefsky * enough information for the alternatives patching code to patch an 11fba9eb79SMartin Schwidefsky * instruction. See apply_alternatives(). 12fba9eb79SMartin Schwidefsky */ 13fba9eb79SMartin Schwidefsky .macro alt_entry orig_start, orig_end, alt_start, alt_end, feature 14fba9eb79SMartin Schwidefsky .long \orig_start - . 15fba9eb79SMartin Schwidefsky .long \alt_start - . 16fba9eb79SMartin Schwidefsky .word \feature 17fba9eb79SMartin Schwidefsky .byte \orig_end - \orig_start 18*e6ed91fdSHeiko Carstens .org . - ( \orig_end - \orig_start ) + ( \alt_end - \alt_start ) 19*e6ed91fdSHeiko Carstens .org . - ( \alt_end - \alt_start ) + ( \orig_end - \orig_start ) 20fba9eb79SMartin Schwidefsky .endm 21fba9eb79SMartin Schwidefsky 22fba9eb79SMartin Schwidefsky /* 23fba9eb79SMartin Schwidefsky * Define an alternative between two instructions. If @feature is 24fba9eb79SMartin Schwidefsky * present, early code in apply_alternatives() replaces @oldinstr with 25*e6ed91fdSHeiko Carstens * @newinstr. 26fba9eb79SMartin Schwidefsky */ 27fba9eb79SMartin Schwidefsky .macro ALTERNATIVE oldinstr, newinstr, feature 28fba9eb79SMartin Schwidefsky .pushsection .altinstr_replacement,"ax" 29fba9eb79SMartin Schwidefsky 770: \newinstr 30fba9eb79SMartin Schwidefsky 771: .popsection 31fba9eb79SMartin Schwidefsky 772: \oldinstr 32*e6ed91fdSHeiko Carstens 773: .pushsection .altinstructions,"a" 33*e6ed91fdSHeiko Carstens alt_entry 772b, 773b, 770b, 771b, \feature 34fba9eb79SMartin Schwidefsky .popsection 35fba9eb79SMartin Schwidefsky .endm 36fba9eb79SMartin Schwidefsky 37fba9eb79SMartin Schwidefsky /* 38fba9eb79SMartin Schwidefsky * Define an alternative between two instructions. If @feature is 39fba9eb79SMartin Schwidefsky * present, early code in apply_alternatives() replaces @oldinstr with 40*e6ed91fdSHeiko Carstens * @newinstr. 41fba9eb79SMartin Schwidefsky */ 42fba9eb79SMartin Schwidefsky .macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 43fba9eb79SMartin Schwidefsky .pushsection .altinstr_replacement,"ax" 44fba9eb79SMartin Schwidefsky 770: \newinstr1 45fba9eb79SMartin Schwidefsky 771: \newinstr2 46fba9eb79SMartin Schwidefsky 772: .popsection 47fba9eb79SMartin Schwidefsky 773: \oldinstr 48*e6ed91fdSHeiko Carstens 774: .pushsection .altinstructions,"a" 49*e6ed91fdSHeiko Carstens alt_entry 773b, 774b, 770b, 771b,\feature1 50*e6ed91fdSHeiko Carstens alt_entry 773b, 774b, 771b, 772b,\feature2 51fba9eb79SMartin Schwidefsky .popsection 52fba9eb79SMartin Schwidefsky .endm 53fba9eb79SMartin Schwidefsky 54fba9eb79SMartin Schwidefsky #endif /* __ASSEMBLY__ */ 55fba9eb79SMartin Schwidefsky 56fba9eb79SMartin Schwidefsky #endif /* _ASM_S390_ALTERNATIVE_ASM_H */ 57