88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_S390_FUTEX_H
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#define _ASM_S390_FUTEX_H
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#include <linux/uaccess.h>
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#include <linux/futex.h>
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#include <asm/mmu_context.h>
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#include <asm/errno.h>
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#define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
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asm volatile( \
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" sacf 256\n" \
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"0: l %1,0(%6)\n" \
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"1:"insn \
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"2: cs %1,%2,0(%6)\n" \
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"3: jl 1b\n" \
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" lhi %0,0\n" \
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"4: sacf 768\n" \
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EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
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: "=d" (ret), "=&d" (oldval), "=&d" (newval), \
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"=m" (*uaddr) \
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: "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
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"m" (*uaddr) : "cc");
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static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
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u32 __user *uaddr)
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{
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int oldval = 0, newval, ret;
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mm_segment_t old_fs;
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old_fs = enable_sacf_uaccess();
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pagefault_disable();
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switch (op) {
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case FUTEX_OP_SET:
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__futex_atomic_op("lr %2,%5\n",
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ret, oldval, newval, uaddr, oparg);
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break;
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case FUTEX_OP_ADD:
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__futex_atomic_op("lr %2,%1\nar %2,%5\n",
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ret, oldval, newval, uaddr, oparg);
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break;
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case FUTEX_OP_OR:
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__futex_atomic_op("lr %2,%1\nor %2,%5\n",
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ret, oldval, newval, uaddr, oparg);
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break;
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case FUTEX_OP_ANDN:
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__futex_atomic_op("lr %2,%1\nnr %2,%5\n",
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ret, oldval, newval, uaddr, oparg);
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break;
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case FUTEX_OP_XOR:
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__futex_atomic_op("lr %2,%1\nxr %2,%5\n",
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ret, oldval, newval, uaddr, oparg);
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break;
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default:
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ret = -ENOSYS;
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}
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pagefault_enable();
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disable_sacf_uaccess(old_fs);
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if (!ret)
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*oval = oldval;
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return ret;
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}
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static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
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u32 oldval, u32 newval)
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{
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mm_segment_t old_fs;
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int ret;
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old_fs = enable_sacf_uaccess();
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asm volatile(
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" sacf 256\n"
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"0: cs %1,%4,0(%5)\n"
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"1: la %0,0\n"
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"2: sacf 768\n"
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EX_TABLE(0b,2b) EX_TABLE(1b,2b)
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: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
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: "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
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: "cc", "memory");
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disable_sacf_uaccess(old_fs);
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*uval = oldval;
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return ret;
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}
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#endif /* _ASM_S390_FUTEX_H */
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