202 lines
4.9 KiB
C
202 lines
4.9 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org)
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*/
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#ifndef _ASM_FUTEX_H
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#define _ASM_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/asm-eva.h>
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#include <asm/barrier.h>
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#include <asm/compiler.h>
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#include <asm/errno.h>
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#include <asm/war.h>
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
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{ \
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if (cpu_has_llsc && R10000_LLSC_WAR) { \
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__asm__ __volatile__( \
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" .set push \n" \
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" .set noat \n" \
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" .set arch=r4000 \n" \
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"1: ll %1, %4 # __futex_atomic_op \n" \
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" .set mips0 \n" \
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" " insn " \n" \
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" .set arch=r4000 \n" \
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"2: sc $1, %2 \n" \
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" beqzl $1, 1b \n" \
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__WEAK_LLSC_MB \
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"3: \n" \
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" .insn \n" \
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" .set pop \n" \
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" .set mips0 \n" \
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" .section .fixup,\"ax\" \n" \
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"4: li %0, %6 \n" \
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" j 3b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\" \n" \
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" "__UA_ADDR "\t1b, 4b \n" \
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" "__UA_ADDR "\t2b, 4b \n" \
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" .previous \n" \
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: "=r" (ret), "=&r" (oldval), \
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"=" GCC_OFF_SMALL_ASM() (*uaddr) \
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: "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
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"i" (-EFAULT) \
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: "memory"); \
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} else if (cpu_has_llsc) { \
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__asm__ __volatile__( \
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" .set push \n" \
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" .set noat \n" \
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" .set "MIPS_ISA_ARCH_LEVEL" \n" \
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"1: "user_ll("%1", "%4")" # __futex_atomic_op\n" \
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" .set mips0 \n" \
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" " insn " \n" \
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" .set "MIPS_ISA_ARCH_LEVEL" \n" \
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"2: "user_sc("$1", "%2")" \n" \
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" beqz $1, 1b \n" \
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__WEAK_LLSC_MB \
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"3: \n" \
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" .insn \n" \
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" .set pop \n" \
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" .set mips0 \n" \
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" .section .fixup,\"ax\" \n" \
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"4: li %0, %6 \n" \
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" j 3b \n" \
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" .previous \n" \
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" .section __ex_table,\"a\" \n" \
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" "__UA_ADDR "\t1b, 4b \n" \
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" "__UA_ADDR "\t2b, 4b \n" \
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" .previous \n" \
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: "=r" (ret), "=&r" (oldval), \
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"=" GCC_OFF_SMALL_ASM() (*uaddr) \
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: "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
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"i" (-EFAULT) \
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: "memory"); \
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} else \
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ret = -ENOSYS; \
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}
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static inline int
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arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
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{
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int oldval = 0, ret;
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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("move $1, %z5", ret, oldval, uaddr, oparg);
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break;
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case FUTEX_OP_ADD:
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__futex_atomic_op("addu $1, %1, %z5",
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ret, oldval, uaddr, oparg);
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break;
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case FUTEX_OP_OR:
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__futex_atomic_op("or $1, %1, %z5",
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ret, oldval, uaddr, oparg);
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break;
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case FUTEX_OP_ANDN:
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__futex_atomic_op("and $1, %1, %z5",
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ret, oldval, uaddr, ~oparg);
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break;
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case FUTEX_OP_XOR:
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__futex_atomic_op("xor $1, %1, %z5",
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ret, oldval, 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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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;
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u32 val;
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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
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return -EFAULT;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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"# futex_atomic_cmpxchg_inatomic \n"
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" .set push \n"
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" .set noat \n"
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" .set arch=r4000 \n"
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"1: ll %1, %3 \n"
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" bne %1, %z4, 3f \n"
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" .set mips0 \n"
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" move $1, %z5 \n"
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" .set arch=r4000 \n"
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"2: sc $1, %2 \n"
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" beqzl $1, 1b \n"
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__WEAK_LLSC_MB
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"3: \n"
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" .insn \n"
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" .set pop \n"
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" .section .fixup,\"ax\" \n"
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"4: li %0, %6 \n"
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" j 3b \n"
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" .previous \n"
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" .section __ex_table,\"a\" \n"
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" "__UA_ADDR "\t1b, 4b \n"
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" "__UA_ADDR "\t2b, 4b \n"
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" .previous \n"
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: "+r" (ret), "=&r" (val), "=" GCC_OFF_SMALL_ASM() (*uaddr)
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: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
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"i" (-EFAULT)
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: "memory");
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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"# futex_atomic_cmpxchg_inatomic \n"
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" .set push \n"
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" .set noat \n"
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" .set "MIPS_ISA_ARCH_LEVEL" \n"
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"1: "user_ll("%1", "%3")" \n"
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" bne %1, %z4, 3f \n"
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" .set mips0 \n"
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" move $1, %z5 \n"
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" .set "MIPS_ISA_ARCH_LEVEL" \n"
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"2: "user_sc("$1", "%2")" \n"
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" beqz $1, 1b \n"
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__WEAK_LLSC_MB
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"3: \n"
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" .insn \n"
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" .set pop \n"
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" .section .fixup,\"ax\" \n"
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"4: li %0, %6 \n"
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" j 3b \n"
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" .previous \n"
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" .section __ex_table,\"a\" \n"
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" "__UA_ADDR "\t1b, 4b \n"
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" "__UA_ADDR "\t2b, 4b \n"
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" .previous \n"
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: "+r" (ret), "=&r" (val), "=" GCC_OFF_SMALL_ASM() (*uaddr)
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: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
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"i" (-EFAULT)
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: "memory");
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} else
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return -ENOSYS;
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*uval = val;
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return ret;
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}
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#endif
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#endif /* _ASM_FUTEX_H */
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