Release 4.11 arch/mips/include/asm/futex.h
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org)
*/
#ifndef _ASM_FUTEX_H
#define _ASM_FUTEX_H
#ifdef __KERNEL__
#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/asm-eva.h>
#include <asm/barrier.h>
#include <asm/compiler.h>
#include <asm/errno.h>
#include <asm/war.h>
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
{ \
if (cpu_has_llsc && R10000_LLSC_WAR) { \
__asm__ __volatile__( \
" .set push \n" \
" .set noat \n" \
" .set arch=r4000 \n" \
"1: ll %1, %4 # __futex_atomic_op \n" \
" .set mips0 \n" \
" " insn " \n" \
" .set arch=r4000 \n" \
"2: sc $1, %2 \n" \
" beqzl $1, 1b \n" \
__WEAK_LLSC_MB \
"3: \n" \
" .insn \n" \
" .set pop \n" \
" .set mips0 \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %6 \n" \
" j 3b \n" \
" .previous \n" \
" .section __ex_table,\"a\" \n" \
" "__UA_ADDR "\t1b, 4b \n" \
" "__UA_ADDR "\t2b, 4b \n" \
" .previous \n" \
: "=r" (ret), "=&r" (oldval), \
"=" GCC_OFF_SMALL_ASM() (*uaddr) \
: "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
"i" (-EFAULT) \
: "memory"); \
} else if (cpu_has_llsc) { \
__asm__ __volatile__( \
" .set push \n" \
" .set noat \n" \
" .set "MIPS_ISA_ARCH_LEVEL" \n" \
"1: "user_ll("%1", "%4")" # __futex_atomic_op\n" \
" .set mips0 \n" \
" " insn " \n" \
" .set "MIPS_ISA_ARCH_LEVEL" \n" \
"2: "user_sc("$1", "%2")" \n" \
" beqz $1, 1b \n" \
__WEAK_LLSC_MB \
"3: \n" \
" .insn \n" \
" .set pop \n" \
" .set mips0 \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %6 \n" \
" j 3b \n" \
" .previous \n" \
" .section __ex_table,\"a\" \n" \
" "__UA_ADDR "\t1b, 4b \n" \
" "__UA_ADDR "\t2b, 4b \n" \
" .previous \n" \
: "=r" (ret), "=&r" (oldval), \
"=" GCC_OFF_SMALL_ASM() (*uaddr) \
: "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
"i" (-EFAULT) \
: "memory"); \
} else \
ret = -ENOSYS; \
}
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;
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u32)))
return -EFAULT;
pagefault_disable();
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("addu $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("or $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("and $1, %1, %z5",
ret, oldval, uaddr, ~oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("xor $1, %1, %z5",
ret, oldval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
pagefault_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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jakub Jelínek | 224 | 74.92% | 1 | 16.67% |
| Ralf Bächle | 68 | 22.74% | 2 | 33.33% |
| Atsushi Nemoto | 3 | 1.00% | 1 | 16.67% |
| Peter Zijlstra | 2 | 0.67% | 1 | 16.67% |
| Michel Lespinasse | 2 | 0.67% | 1 | 16.67% |
| Total | 299 | 100.00% | 6 | 100.00% |
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;
if (cpu_has_llsc && R10000_LLSC_WAR) {
__asm__ __volatile__(
"# futex_atomic_cmpxchg_inatomic \n"
" .set push \n"
" .set noat \n"
" .set arch=r4000 \n"
"1: ll %1, %3 \n"
" bne %1, %z4, 3f \n"
" .set mips0 \n"
" move $1, %z5 \n"
" .set arch=r4000 \n"
"2: sc $1, %2 \n"
" beqzl $1, 1b \n"
__WEAK_LLSC_MB
"3: \n"
" .insn \n"
" .set pop \n"
" .section .fixup,\"ax\" \n"
"4: li %0, %6 \n"
" j 3b \n"
" .previous \n"
" .section __ex_table,\"a\" \n"
" "__UA_ADDR "\t1b, 4b \n"
" "__UA_ADDR "\t2b, 4b \n"
" .previous \n"
: "+r" (ret), "=&r" (val), "=" GCC_OFF_SMALL_ASM() (*uaddr)
: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
"i" (-EFAULT)
: "memory");
} else if (cpu_has_llsc) {
__asm__ __volatile__(
"# futex_atomic_cmpxchg_inatomic \n"
" .set push \n"
" .set noat \n"
" .set "MIPS_ISA_ARCH_LEVEL" \n"
"1: "user_ll("%1", "%3")" \n"
" bne %1, %z4, 3f \n"
" .set mips0 \n"
" move $1, %z5 \n"
" .set "MIPS_ISA_ARCH_LEVEL" \n"
"2: "user_sc("$1", "%2")" \n"
" beqz $1, 1b \n"
__WEAK_LLSC_MB
"3: \n"
" .insn \n"
" .set pop \n"
" .section .fixup,\"ax\" \n"
"4: li %0, %6 \n"
" j 3b \n"
" .previous \n"
" .section __ex_table,\"a\" \n"
" "__UA_ADDR "\t1b, 4b \n"
" "__UA_ADDR "\t2b, 4b \n"
" .previous \n"
: "+r" (ret), "=&r" (val), "=" GCC_OFF_SMALL_ASM() (*uaddr)
: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
"i" (-EFAULT)
: "memory");
} else
return -ENOSYS;
*uval = val;
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 42 | 50.60% | 1 | 14.29% |
| Michel Lespinasse | 20 | 24.10% | 2 | 28.57% |
| Ingo Molnar | 19 | 22.89% | 2 | 28.57% |
| Markos Chandras | 2 | 2.41% | 2 | 28.57% |
| Total | 83 | 100.00% | 7 | 100.00% |
#endif
#endif /* _ASM_FUTEX_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jakub Jelínek | 244 | 56.22% | 1 | 5.88% |
| Ralf Bächle | 132 | 30.41% | 5 | 29.41% |
| Michel Lespinasse | 22 | 5.07% | 2 | 11.76% |
| Ingo Molnar | 19 | 4.38% | 2 | 11.76% |
| Markos Chandras | 6 | 1.38% | 3 | 17.65% |
| Maciej W. Rozycki | 3 | 0.69% | 1 | 5.88% |
| Atsushi Nemoto | 3 | 0.69% | 1 | 5.88% |
| Jeff Dike | 3 | 0.69% | 1 | 5.88% |
| Peter Zijlstra | 2 | 0.46% | 1 | 5.88% |
| Total | 434 | 100.00% | 17 | 100.00% |
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