8feca0e182
Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Signed-off-by: Linas Vepstas <linas@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
#ifndef _ASM_HEXAGON_FUTEX_H
|
|
#define _ASM_HEXAGON_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
/* XXX TODO-- need to add sync barriers! */
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
__asm__ __volatile( \
|
|
"1: %0 = memw_locked(%3);\n" \
|
|
/* For example: %1 = %4 */ \
|
|
insn \
|
|
"2: memw_locked(%3,p2) = %1;\n" \
|
|
" if !p2 jump 1b;\n" \
|
|
" %1 = #0;\n" \
|
|
"3:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"4: %1 = #%5;\n" \
|
|
" jump 3b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
".long 1b,4b,2b,4b\n" \
|
|
".previous\n" \
|
|
: "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \
|
|
: "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
|
|
: "p2", "memory")
|
|
|
|
|
|
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;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
pagefault_disable();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("%1 = %4\n", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("%1 = add(%0,%4)\n", ret, oldval, uaddr,
|
|
oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("%1 = or(%0,%4)\n", ret, oldval, uaddr,
|
|
oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("%1 = not(%4); %1 = and(%0,%1)\n", ret,
|
|
oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("%1 = xor(%0,%4)\n", 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;
|
|
}
|
|
|
|
static inline int
|
|
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval,
|
|
u32 newval)
|
|
{
|
|
int prev;
|
|
int ret;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ (
|
|
"1: %1 = memw_locked(%3)\n"
|
|
" {\n"
|
|
" p2 = cmp.eq(%1,%4)\n"
|
|
" if !p2.new jump:NT 3f\n"
|
|
" }\n"
|
|
"2: memw_locked(%3,p2) = %5\n"
|
|
" if !p2 jump 1b\n"
|
|
"3:\n"
|
|
".section .fixup,\"ax\"\n"
|
|
"4: %0 = #%6\n"
|
|
" jump 3b\n"
|
|
".previous\n"
|
|
".section __ex_table,\"a\"\n"
|
|
".long 1b,4b,2b,4b\n"
|
|
".previous\n"
|
|
: "+r" (ret), "=&r" (prev), "+m" (*uaddr)
|
|
: "r" (uaddr), "r" (oldval), "r" (newval), "i"(-EFAULT)
|
|
: "p2", "memory");
|
|
|
|
*uval = prev;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_HEXAGON_FUTEX_H */
|