diff options
Diffstat (limited to 'arch/x86/include/asm/idtentry.h')
| -rw-r--r-- | arch/x86/include/asm/idtentry.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 36e5b929389b..2fc0dc8af2a4 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -347,6 +347,54 @@ __visible noinstr void func(struct pt_regs *regs, \ #define DECLARE_IDTENTRY_XEN(vector, func) \ idtentry vector asm_exc_xen##func exc_##func has_error_code=0 +/* + * ASM code to emit the common vector entry stubs where each stub is + * packed into 8 bytes. + * + * Note, that the 'pushq imm8' is emitted via '.byte 0x6a, vector' because + * GCC treats the local vector variable as unsigned int and would expand + * all vectors above 0x7F to a 5 byte push. The original code did an + * adjustment of the vector number to be in the signed byte range to avoid + * this. While clever it's mindboggling counterintuitive and requires the + * odd conversion back to a real vector number in the C entry points. Using + * .byte achieves the same thing and the only fixup needed in the C entry + * point is to mask off the bits above bit 7 because the push is sign + * extending. + */ + .align 8 +SYM_CODE_START(irq_entries_start) + vector=FIRST_EXTERNAL_VECTOR + pos = . + .rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR) + UNWIND_HINT_IRET_REGS + .byte 0x6a, vector + jmp common_interrupt + nop + /* Ensure that the above is 8 bytes max */ + . = pos + 8 + pos=pos+8 + vector=vector+1 + .endr +SYM_CODE_END(irq_entries_start) + +#ifdef CONFIG_X86_LOCAL_APIC + .align 8 +SYM_CODE_START(spurious_entries_start) + vector=FIRST_SYSTEM_VECTOR + pos = . + .rept (NR_VECTORS - FIRST_SYSTEM_VECTOR) + UNWIND_HINT_IRET_REGS + .byte 0x6a, vector + jmp common_spurious + nop + /* Ensure that the above is 8 bytes max */ + . = pos + 8 + pos=pos+8 + vector=vector+1 + .endr +SYM_CODE_END(spurious_entries_start) +#endif + #endif /* __ASSEMBLY__ */ /* |