/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_ARM_FUTEX_H #define _ASM_ARM_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> #define __futex_atomic_ex_table(err_reg) \ "3:\n" \ " .pushsection __ex_table,\"a\"\n" \ " .align 3\n" \ " .long 1b, 4f, 2b, 4f\n" \ " .popsection\n" \ " .pushsection .text.fixup,\"ax\"\n" \ " .align 2\n" \ "4: mov %0, " err_reg "\n" \ " b 3b\n" \ " .popsection" #ifdef CONFIG_SMP #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \ ({ \ unsigned int __ua_flags; \ smp_mb(); \ prefetchw(uaddr); \ __ua_flags = uaccess_save_and_enable(); \ __asm__ __volatile__( \ "1: ldrex %1, [%3]\n" \ " " insn "\n" \ "2: strex %2, %0, [%3]\n" \ " teq %2, #0\n" \ " bne 1b\n" \ " mov %0, #0\n" \ __futex_atomic_ex_table("%5") \ : "=&r" (ret), "=&r" (oldval), "=&r" (tmp) \ : "r" (uaddr), "r" (oparg), "Ir" (-EFAULT) \ : "cc", "memory"); \ uaccess_restore(__ua_flags); \ }) static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { unsigned int __ua_flags; int ret; u32 val; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; smp_mb(); /* Prefetching cannot fault */ prefetchw(uaddr); __ua_flags = uaccess_save_and_enable(); __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" "1: ldrex %1, [%4]\n" " teq %1, %2\n" " ite eq @ explicit IT needed for the 2b label\n" "2: strexeq %0, %3, [%4]\n" " movne %0, #0\n" " teq %0, #0\n" " bne 1b\n" __futex_atomic_ex_table("%5") : "=&r" (ret), "=&r" (val) : "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT) : "cc", "memory"); uaccess_restore(__ua_flags); smp_mb(); *uval = val; return ret; } #else /* !SMP, we can work around lack of atomic ops by disabling preemption */ #include <linux/preempt.h> #include <asm/domain.h> #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \ ({ \ unsigned int __ua_flags = uaccess_save_and_enable(); \ __asm__ __volatile__( \ "1: " TUSER(ldr) " %1, [%3]\n" \ " " insn "\n" \ "2: " TUSER(str) " %0, [%3]\n" \ " mov %0, #0\n" \ __futex_atomic_ex_table("%5") \ : "=&r" (ret), "=&r" (oldval), "=&r" (tmp) \ : "r" (uaddr), "r" (oparg), "Ir" (-EFAULT) \ : "cc", "memory"); \ uaccess_restore(__ua_flags); \ }) static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { unsigned int __ua_flags; int ret = 0; u32 val; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; preempt_disable(); __ua_flags = uaccess_save_and_enable(); __asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n" "1: " TUSER(ldr) " %1, [%4]\n" " teq %1, %2\n" " it eq @ explicit IT needed for the 2b label\n" "2: " TUSER(streq) " %3, [%4]\n" __futex_atomic_ex_table("%5") : "+r" (ret), "=&r" (val) : "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT) : "cc", "memory"); uaccess_restore(__ua_flags); *uval = val; preempt_enable(); return ret; } #endif /* !SMP */ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) { int oldval = 0, ret, tmp; #ifndef CONFIG_SMP preempt_disable(); #endif pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("mov %0, %4", ret, oldval, tmp, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("add %0, %1, %4", ret, oldval, tmp, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("orr %0, %1, %4", ret, oldval, tmp, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("and %0, %1, %4", ret, oldval, tmp, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("eor %0, %1, %4", ret, oldval, tmp, uaddr, oparg); break; default: ret = -ENOSYS; } pagefault_enable(); #ifndef CONFIG_SMP preempt_enable(); #endif /* * Store unconditionally. If ret != 0 the extra store is the least * of the worries but GCC cannot figure out that __futex_atomic_op() * is either setting ret to -EFAULT or storing the old value in * oldval which results in a uninitialized warning at the call site. */ *oval = oldval; return ret; } #endif /* __KERNEL__ */ #endif /* _ASM_ARM_FUTEX_H */
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mach | Folder | 0755 |
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xen | Folder | 0755 |
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arch_gicv3.h | File | 9.05 KB | 0644 |
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arch_timer.h | File | 2.48 KB | 0644 |
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arm-cci.h | File | 1.05 KB | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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assembler.h | File | 10.46 KB | 0644 |
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atomic.h | File | 13.22 KB | 0644 |
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clocksource.h | File | 153 B | 0644 |
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compiler.h | File | 978 B | 0644 |
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cpu.h | File | 533 B | 0644 |
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ftrace.h | File | 1.92 KB | 0644 |
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futex.h | File | 4.24 KB | 0644 |
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highmem.h | File | 2.15 KB | 0644 |
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hypervisor.h | File | 140 B | 0644 |
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insn.h | File | 636 B | 0644 |
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irq_work.h | File | 234 B | 0644 |
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irqflags.h | File | 3.88 KB | 0644 |
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memory.h | File | 10.12 KB | 0644 |
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mmu.h | File | 953 B | 0644 |
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outercache.h | File | 3.78 KB | 0644 |
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patch.h | File | 438 B | 0644 |
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pci.h | File | 956 B | 0644 |
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percpu.h | File | 1.56 KB | 0644 |
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perf_event.h | File | 850 B | 0644 |
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pgalloc.h | File | 3.79 KB | 0644 |
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pgtable-2level-hwdef.h | File | 3.45 KB | 0644 |
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pgtable-hwdef.h | File | 467 B | 0644 |
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pgtable-nommu.h | File | 2.66 KB | 0644 |
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pgtable.h | File | 11.68 KB | 0644 |
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probes.h | File | 1.73 KB | 0644 |
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proc-fns.h | File | 4.79 KB | 0644 |
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processor.h | File | 3.4 KB | 0644 |
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procinfo.h | File | 1.27 KB | 0644 |
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prom.h | File | 715 B | 0644 |
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psci.h | File | 771 B | 0644 |
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ptrace.h | File | 4.89 KB | 0644 |
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sections.h | File | 189 B | 0644 |
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set_memory.h | File | 1.04 KB | 0644 |
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setup.h | File | 934 B | 0644 |
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shmparam.h | File | 419 B | 0644 |
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signal.h | File | 500 B | 0644 |
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smp.h | File | 3.1 KB | 0644 |
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smp_plat.h | File | 2.48 KB | 0644 |
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smp_scu.h | File | 1.32 KB | 0644 |
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smp_twd.h | File | 908 B | 0644 |
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sparsemem.h | File | 716 B | 0644 |
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spectre.h | File | 906 B | 0644 |
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spinlock.h | File | 5.49 KB | 0644 |
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spinlock_types.h | File | 541 B | 0644 |
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stackprotector.h | File | 1.09 KB | 0644 |
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stacktrace.h | File | 742 B | 0644 |
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stage2_pgtable.h | File | 2.12 KB | 0644 |
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string.h | File | 1.43 KB | 0644 |
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suspend.h | File | 369 B | 0644 |
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swab.h | File | 1005 B | 0644 |
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switch_to.h | File | 1.03 KB | 0644 |
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sync_bitops.h | File | 1.03 KB | 0644 |
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syscall.h | File | 2.48 KB | 0644 |
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system_info.h | File | 763 B | 0644 |
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system_misc.h | File | 1.14 KB | 0644 |
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tcm.h | File | 937 B | 0644 |
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therm.h | File | 655 B | 0644 |
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thread_info.h | File | 5.2 KB | 0644 |
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thread_notify.h | File | 1.2 KB | 0644 |
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timex.h | File | 577 B | 0644 |
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tlb.h | File | 7.37 KB | 0644 |
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tlbflush.h | File | 17.88 KB | 0644 |
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tls.h | File | 3.09 KB | 0644 |
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topology.h | File | 1.18 KB | 0644 |
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traps.h | File | 1.17 KB | 0644 |
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trusted_foundations.h | File | 2.29 KB | 0644 |
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uaccess-asm.h | File | 2.83 KB | 0644 |
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uaccess.h | File | 16.22 KB | 0644 |
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ucontext.h | File | 2.98 KB | 0644 |
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unaligned.h | File | 846 B | 0644 |
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unified.h | File | 1.61 KB | 0644 |
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unistd.h | File | 1.68 KB | 0644 |
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unwind.h | File | 1.71 KB | 0644 |
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uprobes.h | File | 1.07 KB | 0644 |
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user.h | File | 4.2 KB | 0644 |
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v7m.h | File | 2.93 KB | 0644 |
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vdso.h | File | 507 B | 0644 |
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vdso_datapage.h | File | 1.69 KB | 0644 |
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vfp.h | File | 2.86 KB | 0644 |
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vfpmacros.h | File | 2.1 KB | 0644 |
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vga.h | File | 305 B | 0644 |
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virt.h | File | 2.9 KB | 0644 |
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word-at-a-time.h | File | 2.08 KB | 0644 |
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xor.h | File | 5.22 KB | 0644 |
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