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 <schwidefsky@de.ibm.com>
#include <asm/errno.h>
#include <asm/sigp.h>
+#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,
* 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
/*