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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FUTEX_H
#define _ASM_S390_FUTEX_H
#include <linux/instrumented.h>
#include <linux/uaccess.h>
#include <linux/futex.h>
#include <asm/asm-extable.h>
#include <asm/mmu_context.h>
#include <asm/errno.h>
#define FUTEX_OP_FUNC(name, insn) \
static uaccess_kmsan_or_inline int \
__futex_atomic_##name(int oparg, int *old, u32 __user *uaddr) \
{ \
int rc, new; \
\
instrument_copy_from_user_before(old, uaddr, sizeof(*old)); \
asm_inline volatile( \
" sacf 256\n" \
"0: l %[old],%[uaddr]\n" \
"1:"insn \
"2: cs %[old],%[new],%[uaddr]\n" \
"3: jl 1b\n" \
" lhi %[rc],0\n" \
"4: sacf 768\n" \
EX_TABLE_UA_FAULT(0b, 4b, %[rc]) \
EX_TABLE_UA_FAULT(1b, 4b, %[rc]) \
EX_TABLE_UA_FAULT(2b, 4b, %[rc]) \
EX_TABLE_UA_FAULT(3b, 4b, %[rc]) \
: [rc] "=d" (rc), [old] "=&d" (*old), \
[new] "=&d" (new), [uaddr] "+Q" (*uaddr) \
: [oparg] "d" (oparg) \
: "cc"); \
if (!rc) \
instrument_copy_from_user_after(old, uaddr, sizeof(*old), 0); \
return rc; \
}
FUTEX_OP_FUNC(set, "lr %[new],%[oparg]\n")
FUTEX_OP_FUNC(add, "lr %[new],%[old]\n ar %[new],%[oparg]\n")
FUTEX_OP_FUNC(or, "lr %[new],%[old]\n or %[new],%[oparg]\n")
FUTEX_OP_FUNC(and, "lr %[new],%[old]\n nr %[new],%[oparg]\n")
FUTEX_OP_FUNC(xor, "lr %[new],%[old]\n xr %[new],%[oparg]\n")
static inline
int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
{
int old, rc;
switch (op) {
case FUTEX_OP_SET:
rc = __futex_atomic_set(oparg, &old, uaddr);
break;
case FUTEX_OP_ADD:
rc = __futex_atomic_add(oparg, &old, uaddr);
break;
case FUTEX_OP_OR:
rc = __futex_atomic_or(oparg, &old, uaddr);
break;
case FUTEX_OP_ANDN:
rc = __futex_atomic_and(~oparg, &old, uaddr);
break;
case FUTEX_OP_XOR:
rc = __futex_atomic_xor(oparg, &old, uaddr);
break;
default:
rc = -ENOSYS;
}
if (!rc)
*oval = old;
return rc;
}
static uaccess_kmsan_or_inline
int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval)
{
int rc;
instrument_copy_from_user_before(uval, uaddr, sizeof(*uval));
asm_inline volatile(
" sacf 256\n"
"0: cs %[old],%[new],%[uaddr]\n"
"1: lhi %[rc],0\n"
"2: sacf 768\n"
EX_TABLE_UA_FAULT(0b, 2b, %[rc])
EX_TABLE_UA_FAULT(1b, 2b, %[rc])
: [rc] "=d" (rc), [old] "+d" (oldval), [uaddr] "+Q" (*uaddr)
: [new] "d" (newval)
: "cc", "memory");
*uval = oldval;
instrument_copy_from_user_after(uval, uaddr, sizeof(*uval), 0);
return rc;
}
#endif /* _ASM_S390_FUTEX_H */
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