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Editorial Team
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Asked: 2026-06-13T22:12:08+00:00

What is the meaning of the instruction {interrupt do_IRQ} in linux kernel file arch/x86/kernel/entry_64.S

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What is the meaning of the instruction {interrupt do_IRQ} in linux kernel file arch/x86/kernel/entry_64.S ? Is interrupt a instruction or a macro? Where is the definition? How to use it ?

847 common_interrupt: 
848         XCPT_FRAME    
849         addq $-0x80,(%rsp)              /* Adjust vector to [-256,-1] range */
850         interrupt do_IRQ
851         /* 0(%rsp): old_rsp-ARGOFFSET */
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1 Answer

  1. Editorial Team

    It’s declared a short distance above:

    /* 0(%rsp): ~(interrupt number) */
    .macro interrupt func
    /* reserve pt_regs for scratch regs and rbp */
    subq $ORIG_RAX-RBP, %rsp
    CFI_ADJUST_CFA_OFFSET ORIG_RAX-RBP
    call save_args
    PARTIAL_FRAME 0
    call \func
    .endm

    I don’t know what that does, though. 🙂

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