134 lines
2.7 KiB
C
134 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SW64_FUTEX_H
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#define _ASM_SW64_FUTEX_H
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#ifdef __KERNEL__
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#include <linux/futex.h>
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#include <linux/uaccess.h>
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#include <asm/errno.h>
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#include <asm/barrier.h>
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#ifndef LOCK_MEMB
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#ifdef CONFIG_LOCK_MEMB
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#define LOCK_MEMB "memb\n"
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#else
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#define LOCK_MEMB
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#endif
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#endif
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#ifndef LOCK_FIXUP
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#ifdef CONFIG_LOCK_FIXUP
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#define LOCK_FIXUP "memb\n"
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#else
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#define LOCK_FIXUP
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#endif
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#endif
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg, tmp) \
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__asm__ __volatile__( \
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LOCK_MEMB \
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"1: lldw %0, 0(%3)\n" \
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" ldi %2, 1\n" \
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" wr_f %2\n" \
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insn \
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LOCK_FIXUP \
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"2: lstw %1, 0(%3)\n" \
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" rd_f %2\n" \
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" beq %2, 4f\n" \
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" bis $31, $31, %1\n" \
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"3: .subsection 2\n" \
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"4: br 1b\n" \
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" .previous\n" \
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" .section __ex_table, \"a\"\n" \
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" .long 1b-.\n" \
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" ldi $31, 3b-1b(%1)\n" \
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" .long 2b-.\n" \
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" ldi $31, 3b-2b(%1)\n" \
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" .previous\n" \
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: "=&r" (oldval), "=&r"(ret), "=&r"(tmp) \
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: "r" (uaddr), "r"(oparg) \
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: "memory")
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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, ret;
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unsigned long tmp;
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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("mov %4, %1\n", ret, oldval, uaddr, oparg, tmp);
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break;
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case FUTEX_OP_ADD:
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__futex_atomic_op("addw %0, %4, %1\n", ret, oldval, uaddr, oparg, tmp);
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break;
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case FUTEX_OP_OR:
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__futex_atomic_op("or %0, %4, %1\n", ret, oldval, uaddr, oparg, tmp);
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break;
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case FUTEX_OP_ANDN:
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__futex_atomic_op("andnot %0, %4, %1\n", ret, oldval, uaddr, oparg, tmp);
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break;
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case FUTEX_OP_XOR:
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__futex_atomic_op("xor %0, %4, %1\n", ret, oldval, uaddr, oparg, tmp);
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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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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
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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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int ret = 0, cmp;
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u32 prev, tmp;
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if (!access_ok(uaddr, sizeof(u32)))
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return -EFAULT;
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__asm__ __volatile__ (
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#ifdef CONFIG_LOCK_MEMB
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" memb\n"
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#endif
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"1: lldw %1, 0(%4)\n"
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" cmpeq %1, %5, %2\n"
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" wr_f %2\n"
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" bis $31, %6, %3\n"
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#ifdef CONFIG_LOCK_FIXUP
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" memb\n"
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#endif
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"2: lstw %3, 0(%4)\n"
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" rd_f %3\n"
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" beq %2, 3f\n"
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" beq %3, 4f\n"
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"3: .subsection 2\n"
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"4: br 1b\n"
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" .previous\n"
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" .section __ex_table, \"a\"\n"
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" .long 1b-.\n"
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" ldi $31, 3b-1b(%0)\n"
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" .long 2b-.\n"
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" ldi $31, 3b-2b(%0)\n"
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" .previous\n"
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: "+r"(ret), "=&r"(prev), "=&r"(cmp), "=&r"(tmp)
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: "r"(uaddr), "r"((long)(int)oldval), "r"(newval)
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: "memory");
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*uval = prev;
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return ret;
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}
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#endif /* __KERNEL__ */
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#endif /* _ASM_SW64_FUTEX_H */
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