From bf72630130c29e2ba42e3db8d502de6bdfaa7d9a Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 12 Apr 2019 08:57:34 +0200 Subject: [PATCH] s390: use proper expoline sections for .dma code The text_dma.S code uses its own macro to generate an inline version of an expoline. To make it easier to identify all expolines in the kernel use a thunk and a branch to the thunk just like the rest of the kernel code does it. The name of the text_dma.S expoline thunk is __dma__s390_indirect_jump_r14 and the section is named .dma.text.__s390_indirect_jump_r14. This will be needed for the objtool support. Signed-off-by: Martin Schwidefsky --- arch/s390/boot/text_dma.S | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/arch/s390/boot/text_dma.S b/arch/s390/boot/text_dma.S index ea93314..9715715 100644 --- a/arch/s390/boot/text_dma.S +++ b/arch/s390/boot/text_dma.S @@ -9,6 +9,16 @@ #include #include +#ifdef CC_USING_EXPOLINE + .pushsection .dma.text.__s390_indirect_jump_r14,"axG" +__dma__s390_indirect_jump_r14: + larl %r1,0f + ex 0,0(%r1) + j . +0: br %r14 + .popsection +#endif + .section .dma.text,"ax" /* * Simplified version of expoline thunk. The normal thunks can not be used here, @@ -17,10 +27,11 @@ * affects a few functions that are not performance-relevant. */ .macro BR_EX_DMA_r14 - larl %r1,0f - ex 0,0(%r1) - j . -0: br %r14 +#ifdef CC_USING_EXPOLINE + jg __dma__s390_indirect_jump_r14 +#else + br %r14 +#endif .endm /* -- 2.7.4