1 /* SPDX-License-Identifier: GPL-2.0 */ 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]\n" \ 13 " iilf %[__ret],%[c2]\n" \ 14 ".pushsection runtime_ptr_" #sym ",\"a\"\n" \ 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_" #sym ",\"a\"\n" \ 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##_##sym[]; \ 38 extern s32 __stop_runtime_##type##_##sym[]; \ 39 \ 40 runtime_const_fixup(__runtime_fixup_##type, \ 41 (unsigned long)(sym), \ 42 __start_runtime_##type##_##sym, \ 43 __stop_runtime_##type##_##sym); \ 44 } while (0) 45 46 /* 32-bit immediate for iihf and iilf in bits in I2 field */ 47 static inline void __runtime_fixup_32(u32 *p, unsigned int val) 48 { 49 s390_kernel_write(p, &val, sizeof(val)); 50 } 51 52 static inline void __runtime_fixup_ptr(void *where, unsigned long val) 53 { 54 __runtime_fixup_32(where + 2, val >> 32); 55 __runtime_fixup_32(where + 8, val); 56 } 57 58 /* Immediate value is lower 12 bits of D2 field of srl */ 59 static inline void __runtime_fixup_shift(void *where, unsigned long val) 60 { 61 u32 insn = *(u32 *)where; 62 63 insn &= 0xfffff000; 64 insn |= (val & 63); 65 s390_kernel_write(where, &insn, sizeof(insn)); 66 } 67 68 static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), 69 unsigned long val, s32 *start, s32 *end) 70 { 71 while (start < end) { 72 fn(*start + (void *)start, val); 73 start++; 74 } 75 } 76 77 #endif /* _ASM_S390_RUNTIME_CONST_H */ 78