mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
a192dc1600
Implement futex_atomic_op_inuser() and futex_atomic_cmpxchg_inatomic() on IA64 in order to fully support all futex functionality. Signed-off-by: Jakub Jelinek <jakub@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
#ifndef _ASM_FUTEX_H
|
|
#define _ASM_FUTEX_H
|
|
|
|
#include <linux/futex.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
|
|
do { \
|
|
register unsigned long r8 __asm ("r8") = 0; \
|
|
__asm__ __volatile__( \
|
|
" mf;; \n" \
|
|
"[1:] " insn ";; \n" \
|
|
" .xdata4 \"__ex_table\", 1b-., 2f-. \n" \
|
|
"[2:]" \
|
|
: "+r" (r8), "=r" (oldval) \
|
|
: "r" (uaddr), "r" (oparg) \
|
|
: "memory"); \
|
|
ret = r8; \
|
|
} while (0)
|
|
|
|
#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
|
|
do { \
|
|
register unsigned long r8 __asm ("r8") = 0; \
|
|
int val, newval; \
|
|
do { \
|
|
__asm__ __volatile__( \
|
|
" mf;; \n" \
|
|
"[1:] ld4 %3=[%4];; \n" \
|
|
" mov %2=%3 \n" \
|
|
insn ";; \n" \
|
|
" mov ar.ccv=%2;; \n" \
|
|
"[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \
|
|
" .xdata4 \"__ex_table\", 1b-., 3f-.\n" \
|
|
" .xdata4 \"__ex_table\", 2b-., 3f-.\n" \
|
|
"[3:]" \
|
|
: "+r" (r8), "=r" (val), "=&r" (oldval), \
|
|
"=&r" (newval) \
|
|
: "r" (uaddr), "r" (oparg) \
|
|
: "memory"); \
|
|
if (unlikely (r8)) \
|
|
break; \
|
|
} while (unlikely (val != oldval)); \
|
|
ret = r8; \
|
|
} while (0)
|
|
|
|
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;
|
|
|
|
inc_preempt_count();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr,
|
|
oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr,
|
|
~oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
dec_preempt_count();
|
|
|
|
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(int __user *uaddr, int oldval, int newval)
|
|
{
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
{
|
|
register unsigned long r8 __asm ("r8");
|
|
__asm__ __volatile__(
|
|
" mf;; \n"
|
|
" mov ar.ccv=%3;; \n"
|
|
"[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n"
|
|
" .xdata4 \"__ex_table\", 1b-., 2f-. \n"
|
|
"[2:]"
|
|
: "=r" (r8)
|
|
: "r" (uaddr), "r" (newval),
|
|
"rO" ((long) (unsigned) oldval)
|
|
: "memory");
|
|
return r8;
|
|
}
|
|
}
|
|
|
|
#endif /* _ASM_FUTEX_H */
|