mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 00:20:51 +07:00
c51179fb0c
Follow up to 4732efbeb9 - uml must just reuse
as-is the backing architecture support. There is a micro-fixup is needed for the
included file, which won't affect i386 behaviour at all.
I've not tested compilation on x86_64, only on x86, but the code is almost the
same except the culprit test, so everything should be ok on x86_64 too.
Cc: Jakub Jelinek <jakub@redhat.com>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
#ifndef _ASM_FUTEX_H
|
|
#define _ASM_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/system.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \
|
|
__asm__ __volatile ( \
|
|
"1: " insn "\n" \
|
|
"2: .section .fixup,\"ax\"\n\
|
|
3: mov %3, %1\n\
|
|
jmp 2b\n\
|
|
.previous\n\
|
|
.section __ex_table,\"a\"\n\
|
|
.align 8\n\
|
|
.long 1b,3b\n\
|
|
.previous" \
|
|
: "=r" (oldval), "=r" (ret), "=m" (*uaddr) \
|
|
: "i" (-EFAULT), "m" (*uaddr), "0" (oparg), "1" (0))
|
|
|
|
#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \
|
|
__asm__ __volatile ( \
|
|
"1: movl %2, %0\n\
|
|
movl %0, %3\n" \
|
|
insn "\n" \
|
|
"2: " LOCK_PREFIX "cmpxchgl %3, %2\n\
|
|
jnz 1b\n\
|
|
3: .section .fixup,\"ax\"\n\
|
|
4: mov %5, %1\n\
|
|
jmp 3b\n\
|
|
.previous\n\
|
|
.section __ex_table,\"a\"\n\
|
|
.align 8\n\
|
|
.long 1b,4b,2b,4b\n\
|
|
.previous" \
|
|
: "=&a" (oldval), "=&r" (ret), "=m" (*uaddr), \
|
|
"=&r" (tem) \
|
|
: "r" (oparg), "i" (-EFAULT), "m" (*uaddr), "1" (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, tem;
|
|
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
|
oparg = 1 << oparg;
|
|
|
|
if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
inc_preempt_count();
|
|
|
|
if (op == FUTEX_OP_SET)
|
|
__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
|
|
else {
|
|
#if !defined(CONFIG_X86_BSWAP) && !defined(CONFIG_UML)
|
|
if (boot_cpu_data.x86 == 3)
|
|
ret = -ENOSYS;
|
|
else
|
|
#endif
|
|
switch (op) {
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret,
|
|
oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op2("orl %4, %3", ret, oldval, uaddr,
|
|
oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op2("andl %4, %3", ret, oldval, uaddr,
|
|
~oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op2("xorl %4, %3", 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;
|
|
}
|
|
|
|
#endif
|
|
#endif
|