/* * Atomic futex routines * * Based on the PowerPC implementataion * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Copyright (C) 2013 TangoTec Ltd. * * Baruch Siach <baruch@tkos.co.il> */ #ifndef _ASM_XTENSA_FUTEX_H #define _ASM_XTENSA_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <linux/errno.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile( \ "1: l32i %0, %2, 0\n" \ insn "\n" \ " wsr %0, scompare1\n" \ "2: s32c1i %1, %2, 0\n" \ " bne %1, %0, 1b\n" \ " movi %1, 0\n" \ "3:\n" \ " .section .fixup,\"ax\"\n" \ " .align 4\n" \ "4: .long 3b\n" \ "5: l32r %0, 4b\n" \ " movi %1, %3\n" \ " jx %0\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .long 1b,5b,2b,5b\n" \ " .previous\n" \ : "=&r" (oldval), "=&r" (ret) \ : "r" (uaddr), "I" (-EFAULT), "r" (oparg) \ : "memory") static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) { int oldval = 0, ret; #if !XCHAL_HAVE_S32C1I return -ENOSYS; #endif pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("mov %1, %4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("add %1, %0, %4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or %1, %0, %4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("and %1, %0, %4", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("xor %1, %0, %4", ret, oldval, uaddr, oparg); break; default: ret = -ENOSYS; } pagefault_enable(); if (!ret) *oval = oldval; return ret; } static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { int ret = 0; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; #if !XCHAL_HAVE_S32C1I return -ENOSYS; #endif __asm__ __volatile__ ( " # futex_atomic_cmpxchg_inatomic\n" " wsr %5, scompare1\n" "1: s32c1i %1, %4, 0\n" " s32i %1, %6, 0\n" "2:\n" " .section .fixup,\"ax\"\n" " .align 4\n" "3: .long 2b\n" "4: l32r %1, 3b\n" " movi %0, %7\n" " jx %1\n" " .previous\n" " .section __ex_table,\"a\"\n" " .long 1b,4b\n" " .previous\n" : "+r" (ret), "+r" (newval), "+m" (*uaddr), "+m" (*uval) : "r" (uaddr), "r" (oldval), "r" (uval), "I" (-EFAULT) : "memory"); return ret; } #endif /* __KERNEL__ */ #endif /* _ASM_XTENSA_FUTEX_H */
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Kbuild | File | 685 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asm-uaccess.h | File | 4.11 KB | 0644 |
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asmmacro.h | File | 2.76 KB | 0644 |
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atomic.h | File | 7.38 KB | 0644 |
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barrier.h | File | 542 B | 0644 |
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bitops.h | File | 5.08 KB | 0644 |
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bootparam.h | File | 1.37 KB | 0644 |
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bugs.h | File | 451 B | 0644 |
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cache.h | File | 969 B | 0644 |
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cacheasm.h | File | 3.77 KB | 0644 |
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cacheflush.h | File | 5.76 KB | 0644 |
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checksum.h | File | 6 KB | 0644 |
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cmpxchg.h | File | 3.9 KB | 0644 |
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coprocessor.h | File | 5.05 KB | 0644 |
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current.h | File | 675 B | 0644 |
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delay.h | File | 1.63 KB | 0644 |
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dma-mapping.h | File | 855 B | 0644 |
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dma.h | File | 1.79 KB | 0644 |
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elf.h | File | 5.75 KB | 0644 |
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fixmap.h | File | 2.5 KB | 0644 |
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flat.h | File | 686 B | 0644 |
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ftrace.h | File | 979 B | 0644 |
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futex.h | File | 2.59 KB | 0644 |
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highmem.h | File | 2.33 KB | 0644 |
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hw_breakpoint.h | File | 1.45 KB | 0644 |
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hw_irq.h | File | 320 B | 0644 |
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initialize_mmu.h | File | 4.58 KB | 0644 |
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io.h | File | 2.09 KB | 0644 |
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irq.h | File | 1.46 KB | 0644 |
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irqflags.h | File | 1.99 KB | 0644 |
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kmem_layout.h | File | 2.07 KB | 0644 |
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mmu.h | File | 462 B | 0644 |
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mmu_context.h | File | 3.62 KB | 0644 |
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module.h | File | 525 B | 0644 |
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mxregs.h | File | 1.3 KB | 0644 |
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nommu_context.h | File | 602 B | 0644 |
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page.h | File | 5.69 KB | 0644 |
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pci-bridge.h | File | 2.16 KB | 0644 |
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pci.h | File | 1.37 KB | 0644 |
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perf_event.h | File | 108 B | 0644 |
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pgalloc.h | File | 1.84 KB | 0644 |
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pgtable.h | File | 14.89 KB | 0644 |
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platform.h | File | 1.75 KB | 0644 |
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processor.h | File | 7.44 KB | 0644 |
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ptrace.h | File | 3.74 KB | 0644 |
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regs.h | File | 3.87 KB | 0644 |
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segment.h | File | 376 B | 0644 |
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serial.h | File | 443 B | 0644 |
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shmparam.h | File | 561 B | 0644 |
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signal.h | File | 502 B | 0644 |
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smp.h | File | 967 B | 0644 |
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spinlock.h | File | 4.6 KB | 0644 |
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spinlock_types.h | File | 412 B | 0644 |
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stacktrace.h | File | 1.13 KB | 0644 |
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string.h | File | 2.65 KB | 0644 |
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switch_to.h | File | 601 B | 0644 |
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syscall.h | File | 982 B | 0644 |
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sysmem.h | File | 426 B | 0644 |
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thread_info.h | File | 3.62 KB | 0644 |
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timex.h | File | 1.79 KB | 0644 |
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tlb.h | File | 1.1 KB | 0644 |
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tlbflush.h | File | 5.53 KB | 0644 |
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traps.h | File | 1.87 KB | 0644 |
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types.h | File | 501 B | 0644 |
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uaccess.h | File | 8.67 KB | 0644 |
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ucontext.h | File | 540 B | 0644 |
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unaligned.h | File | 864 B | 0644 |
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unistd.h | File | 639 B | 0644 |
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user.h | File | 507 B | 0644 |
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vectors.h | File | 4.05 KB | 0644 |
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vga.h | File | 434 B | 0644 |
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