/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_S390_ALTERNATIVE_ASM_H #define _ASM_S390_ALTERNATIVE_ASM_H #ifdef __ASSEMBLY__ /* * Check the length of an instruction sequence. The length may not be larger * than 254 bytes and it has to be divisible by 2. */ .macro alt_len_check start,end .if ( \end - \start ) > 254 .error "cpu alternatives does not support instructions blocks > 254 bytes\n" .endif .if ( \end - \start ) % 2 .error "cpu alternatives instructions length is odd\n" .endif .endm /* * 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 .byte \alt_end - \alt_start .endm /* * Fill up @bytes with nops. The macro emits 6-byte nop instructions * for the bulk of the area, possibly followed by a 4-byte and/or * a 2-byte nop if the size of the area is not divisible by 6. */ .macro alt_pad_fill bytes .fill ( \bytes ) / 6, 6, 0xc0040000 .fill ( \bytes ) % 6 / 4, 4, 0x47000000 .fill ( \bytes ) % 6 % 4 / 2, 2, 0x0700 .endm /* * Fill up @bytes with nops. If the number of bytes is larger * than 6, emit a jg instruction to branch over all nops, then * fill an area of size (@bytes - 6) with nop instructions. */ .macro alt_pad bytes .if ( \bytes > 0 ) .if ( \bytes > 6 ) jg . + \bytes alt_pad_fill \bytes - 6 .else alt_pad_fill \bytes .endif .endif .endm /* * Define an alternative between two instructions. If @feature is * present, early code in apply_alternatives() replaces @oldinstr with * @newinstr. ".skip" directive takes care of proper instruction padding * in case @newinstr is longer than @oldinstr. */ .macro ALTERNATIVE oldinstr, newinstr, feature .pushsection .altinstr_replacement,"ax" 770: \newinstr 771: .popsection 772: \oldinstr 773: alt_len_check 770b, 771b alt_len_check 772b, 773b alt_pad ( ( 771b - 770b ) - ( 773b - 772b ) ) 774: .pushsection .altinstructions,"a" alt_entry 772b, 774b, 770b, 771b, \feature .popsection .endm /* * Define an alternative between two instructions. If @feature is * present, early code in apply_alternatives() replaces @oldinstr with * @newinstr. ".skip" directive takes care of proper instruction padding * in case @newinstr is longer than @oldinstr. */ .macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 .pushsection .altinstr_replacement,"ax" 770: \newinstr1 771: \newinstr2 772: .popsection 773: \oldinstr 774: alt_len_check 770b, 771b alt_len_check 771b, 772b alt_len_check 773b, 774b .if ( 771b - 770b > 772b - 771b ) alt_pad ( ( 771b - 770b ) - ( 774b - 773b ) ) .else alt_pad ( ( 772b - 771b ) - ( 774b - 773b ) ) .endif 775: .pushsection .altinstructions,"a" alt_entry 773b, 775b, 770b, 771b,\feature1 alt_entry 773b, 775b, 771b, 772b,\feature2 .popsection .endm #endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_ALTERNATIVE_ASM_H */
Name | Type | Size | Permission | Actions |
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fpu | Folder | 0755 |
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trace | Folder | 0755 |
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Kbuild | File | 557 B | 0644 |
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airq.h | File | 3.02 KB | 0644 |
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alternative-asm.h | File | 3.07 KB | 0644 |
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alternative.h | File | 4.99 KB | 0644 |
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ap.h | File | 9.9 KB | 0644 |
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appldata.h | File | 1.54 KB | 0644 |
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archrandom.h | File | 1.1 KB | 0644 |
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asm-prototypes.h | File | 227 B | 0644 |
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atomic.h | File | 5.1 KB | 0644 |
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atomic_ops.h | File | 4.02 KB | 0644 |
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barrier.h | File | 1.84 KB | 0644 |
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bitops.h | File | 10.13 KB | 0644 |
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bug.h | File | 1.49 KB | 0644 |
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bugs.h | File | 441 B | 0644 |
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cache.h | File | 387 B | 0644 |
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ccwdev.h | File | 7.99 KB | 0644 |
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ccwgroup.h | File | 2.53 KB | 0644 |
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checksum.h | File | 3.24 KB | 0644 |
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chpid.h | File | 974 B | 0644 |
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cio.h | File | 8.01 KB | 0644 |
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clp.h | File | 1.32 KB | 0644 |
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cmb.h | File | 425 B | 0644 |
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cmpxchg.h | File | 1.76 KB | 0644 |
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compat.h | File | 7.9 KB | 0644 |
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cpacf.h | File | 16.8 KB | 0644 |
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cpcmd.h | File | 1.11 KB | 0644 |
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cpu.h | File | 549 B | 0644 |
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cpu_mf.h | File | 8.99 KB | 0644 |
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cpufeature.h | File | 963 B | 0644 |
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cputime.h | File | 805 B | 0644 |
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crw.h | File | 1.86 KB | 0644 |
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css_chars.h | File | 769 B | 0644 |
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ctl_reg.h | File | 2.89 KB | 0644 |
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current.h | File | 405 B | 0644 |
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debug.h | File | 8.1 KB | 0644 |
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delay.h | File | 721 B | 0644 |
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diag.h | File | 5.94 KB | 0644 |
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dis.h | File | 637 B | 0644 |
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dma-mapping.h | File | 621 B | 0644 |
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dma.h | File | 456 B | 0644 |
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eadm.h | File | 2.03 KB | 0644 |
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ebcdic.h | File | 1.41 KB | 0644 |
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elf.h | File | 10.36 KB | 0644 |
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exec.h | File | 269 B | 0644 |
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extable.h | File | 875 B | 0644 |
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extmem.h | File | 804 B | 0644 |
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facility.h | File | 2.44 KB | 0644 |
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fcx.h | File | 7.91 KB | 0644 |
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ftrace.h | File | 1.66 KB | 0644 |
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futex.h | File | 2.07 KB | 0644 |
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gmap.h | File | 4.93 KB | 0644 |
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hardirq.h | File | 670 B | 0644 |
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hugetlb.h | File | 2.82 KB | 0644 |
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hw_irq.h | File | 249 B | 0644 |
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idals.h | File | 5.22 KB | 0644 |
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idle.h | File | 709 B | 0644 |
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io.h | File | 2.03 KB | 0644 |
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ipl.h | File | 3.6 KB | 0644 |
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irq.h | File | 2.55 KB | 0644 |
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irqflags.h | File | 1.76 KB | 0644 |
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isc.h | File | 1000 B | 0644 |
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itcw.h | File | 950 B | 0644 |
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jump_label.h | File | 1.36 KB | 0644 |
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kdebug.h | File | 386 B | 0644 |
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kexec.h | File | 1.32 KB | 0644 |
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kprobes.h | File | 2.24 KB | 0644 |
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kvm_host.h | File | 22.24 KB | 0644 |
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kvm_para.h | File | 5.78 KB | 0644 |
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linkage.h | File | 633 B | 0644 |
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livepatch.h | File | 461 B | 0644 |
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lowcore.h | File | 6.29 KB | 0644 |
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mmu.h | File | 1.19 KB | 0644 |
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mmu_context.h | File | 3.84 KB | 0644 |
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mmzone.h | File | 316 B | 0644 |
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module.h | File | 802 B | 0644 |
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nmi.h | File | 3.44 KB | 0644 |
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nospec-branch.h | File | 342 B | 0644 |
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nospec-insn.h | File | 3.81 KB | 0644 |
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numa.h | File | 730 B | 0644 |
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os_info.h | File | 1.1 KB | 0644 |
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page-states.h | File | 486 B | 0644 |
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page.h | File | 5.12 KB | 0644 |
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pci.h | File | 6.26 KB | 0644 |
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pci_clp.h | File | 4.25 KB | 0644 |
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pci_debug.h | File | 608 B | 0644 |
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pci_dma.h | File | 5.7 KB | 0644 |
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pci_insn.h | File | 2.59 KB | 0644 |
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pci_io.h | File | 4.58 KB | 0644 |
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percpu.h | File | 6.43 KB | 0644 |
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perf_event.h | File | 2.71 KB | 0644 |
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pgalloc.h | File | 4.32 KB | 0644 |
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pgtable.h | File | 47.7 KB | 0644 |
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pkey.h | File | 4.23 KB | 0644 |
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preempt.h | File | 3.25 KB | 0644 |
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processor.h | File | 10.42 KB | 0644 |
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ptrace.h | File | 5.27 KB | 0644 |
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qdio.h | File | 11.67 KB | 0644 |
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reset.h | File | 471 B | 0644 |
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runtime_instr.h | File | 1.76 KB | 0644 |
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schid.h | File | 525 B | 0644 |
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sclp.h | File | 3.38 KB | 0644 |
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scsw.h | File | 24.1 KB | 0644 |
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seccomp.h | File | 516 B | 0644 |
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sections.h | File | 155 B | 0644 |
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segment.h | File | 93 B | 0644 |
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serial.h | File | 147 B | 0644 |
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set_memory.h | File | 779 B | 0644 |
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setup.h | File | 4.44 KB | 0644 |
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shmparam.h | File | 285 B | 0644 |
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signal.h | File | 644 B | 0644 |
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sigp.h | File | 1.8 KB | 0644 |
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smp.h | File | 2.45 KB | 0644 |
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sparsemem.h | File | 214 B | 0644 |
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spinlock.h | File | 3.53 KB | 0644 |
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spinlock_types.h | File | 437 B | 0644 |
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stp.h | File | 1.26 KB | 0644 |
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string.h | File | 4.5 KB | 0644 |
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switch_to.h | File | 1.37 KB | 0644 |
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syscall.h | File | 2.63 KB | 0644 |
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sysinfo.h | File | 4.22 KB | 0644 |
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termios.h | File | 685 B | 0644 |
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thread_info.h | File | 3.15 KB | 0644 |
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timex.h | File | 6.15 KB | 0644 |
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tlb.h | File | 5.71 KB | 0644 |
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tlbflush.h | File | 3.52 KB | 0644 |
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topology.h | File | 2.69 KB | 0644 |
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uaccess.h | File | 6.57 KB | 0644 |
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unistd.h | File | 1.03 KB | 0644 |
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uprobes.h | File | 588 B | 0644 |
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user.h | File | 3.3 KB | 0644 |
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vdso.h | File | 1.8 KB | 0644 |
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vga.h | File | 170 B | 0644 |
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vtime.h | File | 182 B | 0644 |
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vtimer.h | File | 866 B | 0644 |
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vx-insn.h | File | 10.66 KB | 0644 |
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xor.h | File | 454 B | 0644 |
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