diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/arm/include/asm/futex.h')
| -rw-r--r-- | ANDROID_3.4.5/arch/arm/include/asm/futex.h | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/ANDROID_3.4.5/arch/arm/include/asm/futex.h b/ANDROID_3.4.5/arch/arm/include/asm/futex.h deleted file mode 100644 index 7be54690..00000000 --- a/ANDROID_3.4.5/arch/arm/include/asm/futex.h +++ /dev/null @@ -1,168 +0,0 @@ -#ifndef _ASM_ARM_FUTEX_H -#define _ASM_ARM_FUTEX_H - -#ifdef __KERNEL__ - -#if defined(CONFIG_CPU_USE_DOMAINS) && defined(CONFIG_SMP) -/* ARM doesn't provide unprivileged exclusive memory accessors */ -#include <asm-generic/futex.h> -#else - -#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 .fixup,\"ax\"\n" \ - "4: mov %0, " err_reg "\n" \ - " b 3b\n" \ - " .popsection" - -#ifdef CONFIG_SMP - -#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \ - smp_mb(); \ - __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") - -static inline int -futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, - u32 oldval, u32 newval) -{ - int ret; - u32 val; - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) - return -EFAULT; - - smp_mb(); - __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"); - 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) \ - __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") - -static inline int -futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, - u32 oldval, u32 newval) -{ - int ret = 0; - u32 val; - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) - return -EFAULT; - - __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"); - - *uval = val; - return ret; -} - -#endif /* !SMP */ - -static inline int -futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr) -{ - int op = (encoded_op >> 28) & 7; - int cmp = (encoded_op >> 24) & 15; - int oparg = (encoded_op << 8) >> 20; - int cmparg = (encoded_op << 20) >> 20; - int oldval = 0, ret, tmp; - - if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) - oparg = 1 << oparg; - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) - return -EFAULT; - - pagefault_disable(); /* implies preempt_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(); /* subsumes preempt_enable() */ - - if (!ret) { - switch (cmp) { - case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; - case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; - case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; - case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; - case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; - case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; - default: ret = -ENOSYS; - } - } - return ret; -} - -#endif /* !(CPU_USE_DOMAINS && SMP) */ -#endif /* __KERNEL__ */ -#endif /* _ASM_ARM_FUTEX_H */ |