x86/entry: Add compatibility with IAS (6ee93f8d) · Commits · 戴 / test

Clang's integrated assembler does not allow symbols with non-absolute values to be reassigned. Modify the interrupt entry loop macro to be compatible with IAS by using a label and an offset. Reported-by:

Nick Desaulniers <ndesaulniers@google.com> Reported-by:

Sedat Dilek <sedat.dilek@gmail.com> Suggested-by:

Nick Desaulniers <ndesaulniers@google.com> Suggested-by:

Brian Gerst <brgerst@gmail.com> Suggested-by:

Arvind Sankar <nivedita@alum.mit.edu> Signed-off-by:

Jian Cai <caij2003@gmail.com> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # Link: https://github.com/ClangBuiltLinux/linux/issues/1043 Link: https://lkml.kernel.org/r/20200714233024.1789985-1-caij2003@gmail.com

arch/x86/include/asm/idtentry.h

+6 −8

Original line number	Diff line number	Diff line
		@@ -469,15 +469,14 @@ __visible noinstr void func(struct pt_regs *regs, \
		.align 8
		SYM_CODE_START(irq_entries_start)
		vector=FIRST_EXTERNAL_VECTOR
		pos = .
		.rept (FIRST_SYSTEM_VECTOR - FIRST_EXTERNAL_VECTOR)
		UNWIND_HINT_IRET_REGS
		0 :
		.byte 0x6a, vector
		jmp asm_common_interrupt
		nop
		/* Ensure that the above is 8 bytes max */
		. = pos + 8
		pos=pos+8
		. = 0b + 8
		vector = vector+1
		.endr
		SYM_CODE_END(irq_entries_start)
		@@ -486,15 +485,14 @@ SYM_CODE_END(irq_entries_start)
		.align 8
		SYM_CODE_START(spurious_entries_start)
		vector=FIRST_SYSTEM_VECTOR
		pos = .
		.rept (NR_VECTORS - FIRST_SYSTEM_VECTOR)
		UNWIND_HINT_IRET_REGS
		0 :
		.byte 0x6a, vector
		jmp asm_spurious_interrupt
		nop
		/* Ensure that the above is 8 bytes max */
		. = pos + 8
		pos=pos+8
		. = 0b + 8
		vector = vector+1
		.endr
		SYM_CODE_END(spurious_entries_start)

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