1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_S390_NOSPEC_ASM_H
3 #define _ASM_S390_NOSPEC_ASM_H
4 
5 #include <asm/alternative-asm.h>
6 #include <asm/asm-offsets.h>
7 #include <asm/dwarf.h>
8 
9 #ifdef __ASSEMBLY__
10 
11 #ifdef CC_USING_EXPOLINE
12 
13 _LC_BR_R1 = __LC_BR_R1
14 
15 /*
16  * The expoline macros are used to create thunks in the same format
17  * as gcc generates them. The 'comdat' section flag makes sure that
18  * the various thunks are merged into a single copy.
19  */
20 	.macro __THUNK_PROLOG_NAME name
21 	.pushsection .text.\name,"axG",@progbits,\name,comdat
22 	.globl \name
23 	.hidden \name
24 	.type \name,@function
25 \name:
26 	CFI_STARTPROC
27 	.endm
28 
29 	.macro __THUNK_EPILOG
30 	CFI_ENDPROC
31 	.popsection
32 	.endm
33 
34 	.macro __THUNK_PROLOG_BR r1,r2
35 	__THUNK_PROLOG_NAME __s390x_indirect_jump_r\r2\()use_r\r1
36 	.endm
37 
38 	.macro __THUNK_PROLOG_BC d0,r1,r2
39 	__THUNK_PROLOG_NAME __s390x_indirect_branch_\d0\()_\r2\()use_\r1
40 	.endm
41 
42 	.macro __THUNK_BR r1,r2
43 	jg	__s390x_indirect_jump_r\r2\()use_r\r1
44 	.endm
45 
46 	.macro __THUNK_BC d0,r1,r2
47 	jg	__s390x_indirect_branch_\d0\()_\r2\()use_\r1
48 	.endm
49 
50 	.macro __THUNK_BRASL r1,r2,r3
51 	brasl	\r1,__s390x_indirect_jump_r\r3\()use_r\r2
52 	.endm
53 
54 	.macro	__DECODE_RR expand,reg,ruse
55 	.set __decode_fail,1
56 	.irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
57 	.ifc \reg,%r\r1
58 	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
59 	.ifc \ruse,%r\r2
60 	\expand \r1,\r2
61 	.set __decode_fail,0
62 	.endif
63 	.endr
64 	.endif
65 	.endr
66 	.if __decode_fail == 1
67 	.error "__DECODE_RR failed"
68 	.endif
69 	.endm
70 
71 	.macro	__DECODE_RRR expand,rsave,rtarget,ruse
72 	.set __decode_fail,1
73 	.irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
74 	.ifc \rsave,%r\r1
75 	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
76 	.ifc \rtarget,%r\r2
77 	.irp r3,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
78 	.ifc \ruse,%r\r3
79 	\expand \r1,\r2,\r3
80 	.set __decode_fail,0
81 	.endif
82 	.endr
83 	.endif
84 	.endr
85 	.endif
86 	.endr
87 	.if __decode_fail == 1
88 	.error "__DECODE_RRR failed"
89 	.endif
90 	.endm
91 
92 	.macro	__DECODE_DRR expand,disp,reg,ruse
93 	.set __decode_fail,1
94 	.irp r1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
95 	.ifc \reg,%r\r1
96 	.irp r2,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
97 	.ifc \ruse,%r\r2
98 	\expand \disp,\r1,\r2
99 	.set __decode_fail,0
100 	.endif
101 	.endr
102 	.endif
103 	.endr
104 	.if __decode_fail == 1
105 	.error "__DECODE_DRR failed"
106 	.endif
107 	.endm
108 
109 	.macro __THUNK_EX_BR reg,ruse
110 	# Be very careful when adding instructions to this macro!
111 	# The ALTERNATIVE replacement code has a .+10 which targets
112 	# the "br \reg" after the code has been patched.
113 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
114 	exrl	0,555f
115 	j	.
116 #else
117 	.ifc \reg,%r1
118 	ALTERNATIVE "ex %r0,_LC_BR_R1", ".insn ril,0xc60000000000,0,.+10", 35
119 	j	.
120 	.else
121 	larl	\ruse,555f
122 	ex	0,0(\ruse)
123 	j	.
124 	.endif
125 #endif
126 555:	br	\reg
127 	.endm
128 
129 	.macro __THUNK_EX_BC disp,reg,ruse
130 #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
131 	exrl	0,556f
132 	j	.
133 #else
134 	larl	\ruse,556f
135 	ex	0,0(\ruse)
136 	j	.
137 #endif
138 556:	b	\disp(\reg)
139 	.endm
140 
141 	.macro GEN_BR_THUNK reg,ruse=%r1
142 	__DECODE_RR __THUNK_PROLOG_BR,\reg,\ruse
143 	__THUNK_EX_BR \reg,\ruse
144 	__THUNK_EPILOG
145 	.endm
146 
147 	.macro GEN_B_THUNK disp,reg,ruse=%r1
148 	__DECODE_DRR __THUNK_PROLOG_BC,\disp,\reg,\ruse
149 	__THUNK_EX_BC \disp,\reg,\ruse
150 	__THUNK_EPILOG
151 	.endm
152 
153 	.macro BR_EX reg,ruse=%r1
154 557:	__DECODE_RR __THUNK_BR,\reg,\ruse
155 	.pushsection .s390_indirect_branches,"a",@progbits
156 	.long	557b-.
157 	.popsection
158 	.endm
159 
160 	 .macro B_EX disp,reg,ruse=%r1
161 558:	__DECODE_DRR __THUNK_BC,\disp,\reg,\ruse
162 	.pushsection .s390_indirect_branches,"a",@progbits
163 	.long	558b-.
164 	.popsection
165 	.endm
166 
167 	.macro BASR_EX rsave,rtarget,ruse=%r1
168 559:	__DECODE_RRR __THUNK_BRASL,\rsave,\rtarget,\ruse
169 	.pushsection .s390_indirect_branches,"a",@progbits
170 	.long	559b-.
171 	.popsection
172 	.endm
173 
174 #else
175 	.macro GEN_BR_THUNK reg,ruse=%r1
176 	.endm
177 
178 	.macro GEN_B_THUNK disp,reg,ruse=%r1
179 	.endm
180 
181 	 .macro BR_EX reg,ruse=%r1
182 	br	\reg
183 	.endm
184 
185 	 .macro B_EX disp,reg,ruse=%r1
186 	b	\disp(\reg)
187 	.endm
188 
189 	.macro BASR_EX rsave,rtarget,ruse=%r1
190 	basr	\rsave,\rtarget
191 	.endm
192 #endif /* CC_USING_EXPOLINE */
193 
194 #endif /* __ASSEMBLY__ */
195 
196 #endif /* _ASM_S390_NOSPEC_ASM_H */
197