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Hirokazu Takata
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May 2, 2009
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--- | ||
refs/heads/master: 65fd21058a791f35aff11eeccd2e270f0faf11ec | ||
refs/heads/master: 9c88b06dc7589fb0bccd617c4659066fb803cfda |
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#ifndef _ASM_ALPHA_FUTEX_H | ||
#define _ASM_ALPHA_FUTEX_H | ||
#ifndef _ASM_FUTEX_H | ||
#define _ASM_FUTEX_H | ||
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#ifdef __KERNEL__ | ||
#include <asm-generic/futex.h> | ||
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#include <linux/futex.h> | ||
#include <linux/uaccess.h> | ||
#include <asm/errno.h> | ||
#include <asm/barrier.h> | ||
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ | ||
__asm__ __volatile__( \ | ||
__ASM_SMP_MB \ | ||
"1: ldl_l %0,0(%2)\n" \ | ||
insn \ | ||
"2: stl_c %1,0(%2)\n" \ | ||
" beq %1,4f\n" \ | ||
" mov $31,%1\n" \ | ||
"3: .subsection 2\n" \ | ||
"4: br 1b\n" \ | ||
" .previous\n" \ | ||
" .section __ex_table,\"a\"\n" \ | ||
" .long 1b-.\n" \ | ||
" lda $31,3b-1b(%1)\n" \ | ||
" .long 2b-.\n" \ | ||
" lda $31,3b-2b(%1)\n" \ | ||
" .previous\n" \ | ||
: "=&r" (oldval), "=&r"(ret) \ | ||
: "r" (uaddr), "r"(oparg) \ | ||
: "memory") | ||
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static inline int futex_atomic_op_inuser (int encoded_op, int __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; | ||
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | ||
oparg = 1 << oparg; | ||
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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
return -EFAULT; | ||
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pagefault_disable(); | ||
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switch (op) { | ||
case FUTEX_OP_SET: | ||
__futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg); | ||
break; | ||
case FUTEX_OP_ADD: | ||
__futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg); | ||
break; | ||
case FUTEX_OP_OR: | ||
__futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg); | ||
break; | ||
case FUTEX_OP_ANDN: | ||
__futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg); | ||
break; | ||
case FUTEX_OP_XOR: | ||
__futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, oparg); | ||
break; | ||
default: | ||
ret = -ENOSYS; | ||
} | ||
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pagefault_enable(); | ||
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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; | ||
} | ||
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static inline int | ||
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | ||
{ | ||
int prev, cmp; | ||
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if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
return -EFAULT; | ||
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__asm__ __volatile__ ( | ||
__ASM_SMP_MB | ||
"1: ldl_l %0,0(%2)\n" | ||
" cmpeq %0,%3,%1\n" | ||
" beq %1,3f\n" | ||
" mov %4,%1\n" | ||
"2: stl_c %1,0(%2)\n" | ||
" beq %1,4f\n" | ||
"3: .subsection 2\n" | ||
"4: br 1b\n" | ||
" .previous\n" | ||
" .section __ex_table,\"a\"\n" | ||
" .long 1b-.\n" | ||
" lda $31,3b-1b(%0)\n" | ||
" .long 2b-.\n" | ||
" lda $31,3b-2b(%0)\n" | ||
" .previous\n" | ||
: "=&r"(prev), "=&r"(cmp) | ||
: "r"(uaddr), "r"((long)oldval), "r"(newval) | ||
: "memory"); | ||
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return prev; | ||
} | ||
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#endif /* __KERNEL__ */ | ||
#endif /* _ASM_ALPHA_FUTEX_H */ | ||
#endif |
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