| /* 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 */ |
