780a0cfda9
Hexagon requires that register predicates in assembly be parenthesized. Link: https://github.com/ClangBuiltLinux/linux/issues/754 Link: http://lkml.kernel.org/r/20191209222956.239798-3-ndesaulniers@google.com Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Suggested-by: Sid Manning <sidneym@codeaurora.org> Acked-by: Brian Cain <bcain@codeaurora.org> Cc: Lee Jones <lee.jones@linaro.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Tuowen Zhao <ztuowen@gmail.com> Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Alexios Zavras <alexios.zavras@intel.com> Cc: Allison Randal <allison@lohutok.net> Cc: Will Deacon <will@kernel.org> Cc: Richard Fontana <rfontana@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#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
|
|
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
|
|
{
|
|
int oldval = 0, ret;
|
|
|
|
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)
|
|
*oval = oldval;
|
|
|
|
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(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 */
|