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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | #ifndef _ASM_S390_FUTEX_H |
| 3 | #define _ASM_S390_FUTEX_H |
| 4 | |
| 5 | #include <linux/instrumented.h> |
| 6 | #include <linux/uaccess.h> |
| 7 | #include <linux/futex.h> |
| 8 | #include <asm/asm-extable.h> |
| 9 | #include <asm/mmu_context.h> |
| 10 | #include <asm/errno.h> |
| 11 | |
| 12 | #define FUTEX_OP_FUNC(name, insn) \ |
| 13 | static uaccess_kmsan_or_inline int \ |
| 14 | __futex_atomic_##name(int oparg, int *old, u32 __user *uaddr) \ |
| 15 | { \ |
| 16 | bool sacf_flag; \ |
| 17 | int rc, new; \ |
| 18 | \ |
| 19 | instrument_copy_from_user_before(old, uaddr, sizeof(*old)); \ |
| 20 | sacf_flag = enable_sacf_uaccess(); \ |
| 21 | asm_inline volatile( \ |
| 22 | " sacf 256\n" \ |
| 23 | "0: l %[old],%[uaddr]\n" \ |
| 24 | "1:"insn \ |
| 25 | "2: cs %[old],%[new],%[uaddr]\n" \ |
| 26 | "3: jl 1b\n" \ |
| 27 | " lhi %[rc],0\n" \ |
| 28 | "4: sacf 768\n" \ |
| 29 | EX_TABLE_UA_FAULT(0b, 4b, %[rc]) \ |
| 30 | EX_TABLE_UA_FAULT(1b, 4b, %[rc]) \ |
| 31 | EX_TABLE_UA_FAULT(2b, 4b, %[rc]) \ |
| 32 | EX_TABLE_UA_FAULT(3b, 4b, %[rc]) \ |
| 33 | : [rc] "=d" (rc), [old] "=&d" (*old), \ |
| 34 | [new] "=&d" (new), [uaddr] "+Q" (*uaddr) \ |
| 35 | : [oparg] "d" (oparg) \ |
| 36 | : "cc"); \ |
| 37 | disable_sacf_uaccess(sacf_flag); \ |
| 38 | if (!rc) \ |
| 39 | instrument_copy_from_user_after(old, uaddr, sizeof(*old), 0); \ |
| 40 | return rc; \ |
| 41 | } |
| 42 | |
| 43 | FUTEX_OP_FUNC(set, "lr %[new],%[oparg]\n") |
| 44 | FUTEX_OP_FUNC(add, "lr %[new],%[old]\n ar %[new],%[oparg]\n") |
| 45 | FUTEX_OP_FUNC(or, "lr %[new],%[old]\n or %[new],%[oparg]\n") |
| 46 | FUTEX_OP_FUNC(and, "lr %[new],%[old]\n nr %[new],%[oparg]\n") |
| 47 | FUTEX_OP_FUNC(xor, "lr %[new],%[old]\n xr %[new],%[oparg]\n") |
| 48 | |
| 49 | static inline |
| 50 | int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) |
| 51 | { |
| 52 | int old, rc; |
| 53 | |
| 54 | switch (op) { |
| 55 | case FUTEX_OP_SET: |
| 56 | rc = __futex_atomic_set(oparg, &old, uaddr); |
| 57 | break; |
| 58 | case FUTEX_OP_ADD: |
| 59 | rc = __futex_atomic_add(oparg, &old, uaddr); |
| 60 | break; |
| 61 | case FUTEX_OP_OR: |
| 62 | rc = __futex_atomic_or(oparg, &old, uaddr); |
| 63 | break; |
| 64 | case FUTEX_OP_ANDN: |
| 65 | rc = __futex_atomic_and(~oparg, &old, uaddr); |
| 66 | break; |
| 67 | case FUTEX_OP_XOR: |
| 68 | rc = __futex_atomic_xor(oparg, &old, uaddr); |
| 69 | break; |
| 70 | default: |
| 71 | rc = -ENOSYS; |
| 72 | } |
| 73 | if (!rc) |
| 74 | *oval = old; |
| 75 | return rc; |
| 76 | } |
| 77 | |
| 78 | static uaccess_kmsan_or_inline |
| 79 | int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) |
| 80 | { |
| 81 | bool sacf_flag; |
| 82 | int rc; |
| 83 | |
| 84 | instrument_copy_from_user_before(uval, uaddr, sizeof(*uval)); |
| 85 | sacf_flag = enable_sacf_uaccess(); |
| 86 | asm_inline volatile( |
| 87 | " sacf 256\n" |
| 88 | "0: cs %[old],%[new],%[uaddr]\n" |
| 89 | "1: lhi %[rc],0\n" |
| 90 | "2: sacf 768\n" |
| 91 | EX_TABLE_UA_FAULT(0b, 2b, %[rc]) |
| 92 | EX_TABLE_UA_FAULT(1b, 2b, %[rc]) |
| 93 | : [rc] "=d" (rc), [old] "+d" (oldval), [uaddr] "+Q" (*uaddr) |
| 94 | : [new] "d" (newval) |
| 95 | : "cc", "memory"); |
| 96 | disable_sacf_uaccess(sacf_flag); |
| 97 | *uval = oldval; |
| 98 | instrument_copy_from_user_after(uval, uaddr, sizeof(*uval), 0); |
| 99 | return rc; |
| 100 | } |
| 101 | |
| 102 | #endif /* _ASM_S390_FUTEX_H */ |
| 103 |
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