mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 18:26:39 +07:00
811d61e384
futex.h's futex_atomic_cmpxchg_inatomic() does not use the
__futex_atomic_op() macro and needs its own PAN toggling. This was missed
when the feature was implemented.
Fixes: 338d4f49d6 ("arm64: kernel: Add support for Privileged Access Never")
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_FUTEX_H
|
|
#define __ASM_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/alternative.h>
|
|
#include <asm/cpufeature.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/sysreg.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, tmp, oparg) \
|
|
asm volatile( \
|
|
ALTERNATIVE("nop", SET_PSTATE_PAN(0), ARM64_HAS_PAN, \
|
|
CONFIG_ARM64_PAN) \
|
|
" prfm pstl1strm, %2\n" \
|
|
"1: ldxr %w1, %2\n" \
|
|
insn "\n" \
|
|
"2: stlxr %w3, %w0, %2\n" \
|
|
" cbnz %w3, 1b\n" \
|
|
" dmb ish\n" \
|
|
"3:\n" \
|
|
" .pushsection .fixup,\"ax\"\n" \
|
|
" .align 2\n" \
|
|
"4: mov %w0, %w5\n" \
|
|
" b 3b\n" \
|
|
" .popsection\n" \
|
|
" .pushsection __ex_table,\"a\"\n" \
|
|
" .align 3\n" \
|
|
" .quad 1b, 4b, 2b, 4b\n" \
|
|
" .popsection\n" \
|
|
ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN, \
|
|
CONFIG_ARM64_PAN) \
|
|
: "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp) \
|
|
: "r" (oparg), "Ir" (-EFAULT) \
|
|
: "memory")
|
|
|
|
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, tmp;
|
|
|
|
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("mov %w0, %w4",
|
|
ret, oldval, uaddr, tmp, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("add %w0, %w1, %w4",
|
|
ret, oldval, uaddr, tmp, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("orr %w0, %w1, %w4",
|
|
ret, oldval, uaddr, tmp, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("and %w0, %w1, %w4",
|
|
ret, oldval, uaddr, tmp, ~oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("eor %w0, %w1, %w4",
|
|
ret, oldval, uaddr, tmp, 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 ret = 0;
|
|
u32 val, tmp;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
asm volatile("// futex_atomic_cmpxchg_inatomic\n"
|
|
ALTERNATIVE("nop", SET_PSTATE_PAN(0), ARM64_HAS_PAN, CONFIG_ARM64_PAN)
|
|
" prfm pstl1strm, %2\n"
|
|
"1: ldxr %w1, %2\n"
|
|
" sub %w3, %w1, %w4\n"
|
|
" cbnz %w3, 3f\n"
|
|
"2: stlxr %w3, %w5, %2\n"
|
|
" cbnz %w3, 1b\n"
|
|
" dmb ish\n"
|
|
"3:\n"
|
|
" .pushsection .fixup,\"ax\"\n"
|
|
"4: mov %w0, %w6\n"
|
|
" b 3b\n"
|
|
" .popsection\n"
|
|
" .pushsection __ex_table,\"a\"\n"
|
|
" .align 3\n"
|
|
" .quad 1b, 4b, 2b, 4b\n"
|
|
" .popsection\n"
|
|
ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN, CONFIG_ARM64_PAN)
|
|
: "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp)
|
|
: "r" (oldval), "r" (newval), "Ir" (-EFAULT)
|
|
: "memory");
|
|
|
|
*uval = val;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_FUTEX_H */
|