1 files changed, 132 insertions, 0 deletions
diff --git a/arch/s390/include/asm/nospec-insn.h b/arch/s390/include/asm/nospec-insn.h
new file mode 100644
index 000000000..7a946c42a
--- /dev/null
+++ b/arch/s390/include/asm/nospec-insn.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_S390_NOSPEC_ASM_H
+#define _ASM_S390_NOSPEC_ASM_H
+
+#include <linux/linkage.h>
+#include <asm/dwarf.h>
+
+#ifdef __ASSEMBLY__
+
+#ifdef CC_USING_EXPOLINE
+
+/*
+ * The expoline macros are used to create thunks in the same format
+ * as gcc generates them. The 'comdat' section flag makes sure that
+ * the various thunks are merged into a single copy.
+ */
+	.macro __THUNK_PROLOG_NAME name
+#ifdef CONFIG_EXPOLINE_EXTERN
+	.pushsection .text,"ax",@progbits
+	__ALIGN
+#else
+	.pushsection .text.\name,"axG",@progbits,\name,comdat
+#endif
+	.globl \name
+	.hidden \name
+	.type \name,@function
+\name:
+	CFI_STARTPROC
+	.endm
+
+	.macro __THUNK_EPILOG_NAME name
+	CFI_ENDPROC
+#ifdef CONFIG_EXPOLINE_EXTERN
+	.size \name, .-\name
+#endif
+	.popsection
+	.endm
+
+	.macro __THUNK_PROLOG_BR r1
+	__THUNK_PROLOG_NAME __s390_indirect_jump_r\r1
+	.endm
+
+	.macro __THUNK_EPILOG_BR r1
+	__THUNK_EPILOG_NAME __s390_indirect_jump_r\r1
+	.endm
+
+	.macro __THUNK_BR r1
+	jg	__s390_indirect_jump_r\r1
+	.endm
+
+	.macro __THUNK_BRASL r1,r2
+	brasl	\r1,__s390_indirect_jump_r\r2
+	.endm
+
+	.macro	__DECODE_R expand,reg
+	.set .L__decode_fail,1
+	.irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
+	.ifc \reg,%r\r1
+	\expand \r1
+	.set .L__decode_fail,0
+	.endif
+	.endr
+	.if .L__decode_fail == 1
+	.error "__DECODE_R failed"
+	.endif
+	.endm
+
+	.macro	__DECODE_RR expand,rsave,rtarget
+	.set .L__decode_fail,1
+	.irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
+	.ifc \rsave,%r\r1
+	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
+	.ifc \rtarget,%r\r2
+	\expand \r1,\r2
+	.set .L__decode_fail,0
+	.endif
+	.endr
+	.endif
+	.endr
+	.if .L__decode_fail == 1
+	.error "__DECODE_RR failed"
+	.endif
+	.endm
+
+	.macro __THUNK_EX_BR reg
+	exrl	0,555f
+	j	.
+555:	br	\reg
+	.endm
+
+#ifdef CONFIG_EXPOLINE_EXTERN
+	.macro GEN_BR_THUNK reg
+	.endm
+	.macro GEN_BR_THUNK_EXTERN reg
+#else
+	.macro GEN_BR_THUNK reg
+#endif
+	__DECODE_R __THUNK_PROLOG_BR,\reg
+	__THUNK_EX_BR \reg
+	__DECODE_R __THUNK_EPILOG_BR,\reg
+	.endm
+
+	.macro BR_EX reg
+557:	__DECODE_R __THUNK_BR,\reg
+	.pushsection .s390_indirect_branches,"a",@progbits
+	.long	557b-.
+	.popsection
+	.endm
+
+	.macro BASR_EX rsave,rtarget
+559:	__DECODE_RR __THUNK_BRASL,\rsave,\rtarget
+	.pushsection .s390_indirect_branches,"a",@progbits
+	.long	559b-.
+	.popsection
+	.endm
+
+#else
+	.macro GEN_BR_THUNK reg
+	.endm
+
+	 .macro BR_EX reg
+	br	\reg
+	.endm
+
+	.macro BASR_EX rsave,rtarget
+	basr	\rsave,\rtarget
+	.endm
+#endif /* CC_USING_EXPOLINE */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_S390_NOSPEC_ASM_H */