1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef _ASM_S390_RUNTIME_CONST_H
3 #define _ASM_S390_RUNTIME_CONST_H
4
5 #include <linux/uaccess.h>
6
7 #define runtime_const_ptr(sym)
8 ({
9 typeof(sym) __ret;
10
11 asm_inline(
12 "0: iihf %[__ret],%[c1]
13 " iilf %[__ret],%[c2]
14 ".pushsection runtime_ptr_" #s
15 ".long 0b - .\n"
16 ".popsection"
17 : [__ret] "=d" (__ret)
18 : [c1] "i" (0x01234567UL),
19 [c2] "i" (0x89abcdefUL));
20 __ret;
21 })
22
23 #define runtime_const_shift_right_32(val, sym)
24 ({
25 unsigned int __ret = (val);
26
27 asm_inline(
28 "0: srl %[__ret],12\n"
29 ".pushsection runtime_shift_"
30 ".long 0b - .\n"
31 ".popsection"
32 : [__ret] "+d" (__ret));
33 __ret;
34 })
35
36 #define runtime_const_init(type, sym) do {
37 extern s32 __start_runtime_##type##_##
38 extern s32 __stop_runtime_##type##_##s
39
40 runtime_const_fixup(__runtime_fixup_##
41 (unsigned long)(sy
42 __start_runtime_##
43 __stop_runtime_##t
44 } while (0)
45
46 /* 32-bit immediate for iihf and iilf in bits
47 static inline void __runtime_fixup_32(u32 *p,
48 {
49 s390_kernel_write(p, &val, sizeof(val)
50 }
51
52 static inline void __runtime_fixup_ptr(void *w
53 {
54 __runtime_fixup_32(where + 2, val >> 3
55 __runtime_fixup_32(where + 8, val);
56 }
57
58 /* Immediate value is lower 12 bits of D2 fiel
59 static inline void __runtime_fixup_shift(void
60 {
61 u32 insn = *(u32 *)where;
62
63 insn &= 0xfffff000;
64 insn |= (val & 63);
65 s390_kernel_write(where, &insn, sizeof
66 }
67
68 static inline void runtime_const_fixup(void (*
69 unsigne
70 {
71 while (start < end) {
72 fn(*start + (void *)start, val
73 start++;
74 }
75 }
76
77 #endif /* _ASM_S390_RUNTIME_CONST_H */
78
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