linux-libre/arch/s390/include/asm/nospec-insn.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_NOSPEC_ASM_H
#define _ASM_S390_NOSPEC_ASM_H

#include <asm/alternative-asm.h>
#include <asm/asm-offsets.h>

#ifdef __ASSEMBLY__

#ifdef CONFIG_EXPOLINE

_LC_BR_R1 = __LC_BR_R1

/*
 * 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
	.pushsection .text.\name,"axG",@progbits,\name,comdat
	.globl \name
	.hidden \name
	.type \name,@function
\name:
	.cfi_startproc
	.endm

	.macro __THUNK_EPILOG
	.cfi_endproc
	.popsection
	.endm

	.macro __THUNK_PROLOG_BR r1,r2
	__THUNK_PROLOG_NAME __s390x_indirect_jump_r\r2\()use_r\r1
	.endm

	.macro __THUNK_PROLOG_BC d0,r1,r2
	__THUNK_PROLOG_NAME __s390x_indirect_branch_\d0\()_\r2\()use_\r1
	.endm

	.macro __THUNK_BR r1,r2
	jg	__s390x_indirect_jump_r\r2\()use_r\r1
	.endm

	.macro __THUNK_BC d0,r1,r2
	jg	__s390x_indirect_branch_\d0\()_\r2\()use_\r1
	.endm

	.macro __THUNK_BRASL r1,r2,r3
	brasl	\r1,__s390x_indirect_jump_r\r3\()use_r\r2
	.endm

	.macro	__DECODE_RR expand,reg,ruse
	.set __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
	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
	.ifc \ruse,%r\r2
	\expand \r1,\r2
	.set __decode_fail,0
	.endif
	.endr
	.endif
	.endr
	.if __decode_fail == 1
	.error "__DECODE_RR failed"
	.endif
	.endm

	.macro	__DECODE_RRR expand,rsave,rtarget,ruse
	.set __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
	.irp r3,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
	.ifc \ruse,%r\r3
	\expand \r1,\r2,\r3
	.set __decode_fail,0
	.endif
	.endr
	.endif
	.endr
	.endif
	.endr
	.if __decode_fail == 1
	.error "__DECODE_RRR failed"
	.endif
	.endm

	.macro	__DECODE_DRR expand,disp,reg,ruse
	.set __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
	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
	.ifc \ruse,%r\r2
	\expand \disp,\r1,\r2
	.set __decode_fail,0
	.endif
	.endr
	.endif
	.endr
	.if __decode_fail == 1
	.error "__DECODE_DRR failed"
	.endif
	.endm

	.macro __THUNK_EX_BR reg,ruse
	# Be very careful when adding instructions to this macro!
	# The ALTERNATIVE replacement code has a .+10 which targets
	# the "br \reg" after the code has been patched.
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
	exrl	0,555f
	j	.
#else
	.ifc \reg,%r1
	ALTERNATIVE "ex %r0,_LC_BR_R1", ".insn ril,0xc60000000000,0,.+10", 35
	j	.
	.else
	larl	\ruse,555f
	ex	0,0(\ruse)
	j	.
	.endif
#endif
555:	br	\reg
	.endm

	.macro __THUNK_EX_BC disp,reg,ruse
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
	exrl	0,556f
	j	.
#else
	larl	\ruse,556f
	ex	0,0(\ruse)
	j	.
#endif
556:	b	\disp(\reg)
	.endm

	.macro GEN_BR_THUNK reg,ruse=%r1
	__DECODE_RR __THUNK_PROLOG_BR,\reg,\ruse
	__THUNK_EX_BR \reg,\ruse
	__THUNK_EPILOG
	.endm

	.macro GEN_B_THUNK disp,reg,ruse=%r1
	__DECODE_DRR __THUNK_PROLOG_BC,\disp,\reg,\ruse
	__THUNK_EX_BC \disp,\reg,\ruse
	__THUNK_EPILOG
	.endm

	.macro BR_EX reg,ruse=%r1
557:	__DECODE_RR __THUNK_BR,\reg,\ruse
	.pushsection .s390_indirect_branches,"a",@progbits
	.long	557b-.
	.popsection
	.endm

	 .macro B_EX disp,reg,ruse=%r1
558:	__DECODE_DRR __THUNK_BC,\disp,\reg,\ruse
	.pushsection .s390_indirect_branches,"a",@progbits
	.long	558b-.
	.popsection
	.endm

	.macro BASR_EX rsave,rtarget,ruse=%r1
559:	__DECODE_RRR __THUNK_BRASL,\rsave,\rtarget,\ruse
	.pushsection .s390_indirect_branches,"a",@progbits
	.long	559b-.
	.popsection
	.endm

#else
	.macro GEN_BR_THUNK reg,ruse=%r1
	.endm

	.macro GEN_B_THUNK disp,reg,ruse=%r1
	.endm

	 .macro BR_EX reg,ruse=%r1
	br	\reg
	.endm

	 .macro B_EX disp,reg,ruse=%r1
	b	\disp(\reg)
	.endm

	.macro BASR_EX rsave,rtarget,ruse=%r1
	basr	\rsave,\rtarget
	.endm
#endif

#endif /* __ASSEMBLY__ */

#endif /* _ASM_S390_NOSPEC_ASM_H */