FM / asm

/usr/src/linux-headers-5.15.0-181/arch/arm/include/asm/

/usr/src/linux-headers-5.15.0-181/arch/arm/include/asm

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hardware/	-	0755	rm
mach/	-	0755	rm
vdso/	-	0755	rm
xen/	-	0755	rm
archrandom.h	192	0644	edit dl rm
arch_gicv3.h	6327	0644	edit dl rm
arch_timer.h	3124	0644	edit dl rm
arm-cci.h	535	0644	edit dl rm
asm-offsets.h	35	0644	edit dl rm
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atomic.h	12536	0644	edit dl rm
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barrier.h	2910	0644	edit dl rm
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floppy.h	2318	0644	edit dl rm
fncpy.h	2552	0644	edit dl rm
fpstate.h	1478	0644	edit dl rm
ftrace.h	1821	0644	edit dl rm
futex.h	4357	0644	edit dl rm
glue-cache.h	3515	0644	edit dl rm
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hypervisor.h	224	0644	edit dl rm
ide.h	566	0644	edit dl rm
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insn.h	636	0644	edit dl rm
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irq.h	887	0644	edit dl rm
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kasan.h	708	0644	edit dl rm
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Kbuild	186	0644	edit dl rm
kexec-internal.h	272	0644	edit dl rm
kexec.h	2255	0644	edit dl rm
kgdb.h	2783	0644	edit dl rm
kprobes.h	2248	0644	edit dl rm
krait-l2-accessors.h	231	0644	edit dl rm
linkage.h	216	0644	edit dl rm
mc146818rtc.h	720	0644	edit dl rm
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mcs_spinlock.h	570	0644	edit dl rm
memblock.h	248	0644	edit dl rm
memory.h	10945	0644	edit dl rm
mmu.h	953	0644	edit dl rm
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module.h	1216	0644	edit dl rm
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processor.h	3166	0644	edit dl rm
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prom.h	552	0644	edit dl rm
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signal.h	559	0644	edit dl rm
smp.h	2839	0644	edit dl rm
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string.h	2165	0644	edit dl rm
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syscall.h	2347	0644	edit dl rm
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topology.h	1139	0644	edit dl rm
traps.h	911	0644	edit dl rm
uaccess-asm.h	2703	0644	edit dl rm
uaccess.h	17431	0644	edit dl rm
ucontext.h	2745	0644	edit dl rm
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unistd.h	1578	0644	edit dl rm
unwind.h	1173	0644	edit dl rm
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user.h	4302	0644	edit dl rm
v7m.h	3233	0644	edit dl rm
vdso.h	507	0644	edit dl rm
vdso_datapage.h	444	0644	edit dl rm
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vfp.h	2969	0644	edit dl rm
vfpmacros.h	2074	0644	edit dl rm
vga.h	305	0644	edit dl rm
virt.h	1855	0644	edit dl rm
vmalloc.h	87	0644	edit dl rm
vmlinux.lds.h	4490	0644	edit dl rm
word-at-a-time.h	2128	0644	edit dl rm
xor.h	5204	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/arch/arm/include/asm/futex.h (4357B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ARM_FUTEX_H
#define _ASM_ARM_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>

#define __futex_atomic_ex_table(err_reg)			\
	"3:\n"							\
	"	.pushsection __ex_table,\"a\"\n"		\
	"	.align	3\n"					\
	"	.long	1b, 4f, 2b, 4f\n"			\
	"	.popsection\n"					\
	"	.pushsection .text.fixup,\"ax\"\n"		\
	"	.align	2\n"					\
	"4:	mov	%0, " err_reg "\n"			\
	"	b	3b\n"					\
	"	.popsection"

#ifdef CONFIG_SMP

#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg)	\
({								\
	unsigned int __ua_flags;				\
	smp_mb();						\
	prefetchw(uaddr);					\
	__ua_flags = uaccess_save_and_enable();			\
	__asm__ __volatile__(					\
	"1:	ldrex	%1, [%3]\n"				\
	"	" insn "\n"					\
	"2:	strex	%2, %0, [%3]\n"				\
	"	teq	%2, #0\n"				\
	"	bne	1b\n"					\
	"	mov	%0, #0\n"				\
	__futex_atomic_ex_table("%5")				\
	: "=&r" (ret), "=&r" (oldval), "=&r" (tmp)		\
	: "r" (uaddr), "r" (oparg), "Ir" (-EFAULT)		\
	: "cc", "memory");					\
	uaccess_restore(__ua_flags);				\
})

static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	unsigned int __ua_flags;
	int ret;
	u32 val;

if (!access_ok(uaddr, sizeof(u32)))
		return -EFAULT;

smp_mb();
	/* Prefetching cannot fault */
	prefetchw(uaddr);
	__ua_flags = uaccess_save_and_enable();
	__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
	"1:	ldrex	%1, [%4]\n"
	"	teq	%1, %2\n"
	"	ite	eq	@ explicit IT needed for the 2b label\n"
	"2:	strexeq	%0, %3, [%4]\n"
	"	movne	%0, #0\n"
	"	teq	%0, #0\n"
	"	bne	1b\n"
	__futex_atomic_ex_table("%5")
	: "=&r" (ret), "=&r" (val)
	: "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT)
	: "cc", "memory");
	uaccess_restore(__ua_flags);
	smp_mb();

*uval = val;
	return ret;
}

#else /* !SMP, we can work around lack of atomic ops by disabling preemption */

#include <linux/preempt.h>
#include <asm/domain.h>

#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg)	\
({								\
	unsigned int __ua_flags = uaccess_save_and_enable();	\
	__asm__ __volatile__(					\
	"1:	" TUSER(ldr) "	%1, [%3]\n"			\
	"	" insn "\n"					\
	"2:	" TUSER(str) "	%0, [%3]\n"			\
	"	mov	%0, #0\n"				\
	__futex_atomic_ex_table("%5")				\
	: "=&r" (ret), "=&r" (oldval), "=&r" (tmp)		\
	: "r" (uaddr), "r" (oparg), "Ir" (-EFAULT)		\
	: "cc", "memory");					\
	uaccess_restore(__ua_flags);				\
})

static inline int
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	unsigned int __ua_flags;
	int ret = 0;
	u32 val;

if (!access_ok(uaddr, sizeof(u32)))
		return -EFAULT;

preempt_disable();
	__ua_flags = uaccess_save_and_enable();
	__asm__ __volatile__("@futex_atomic_cmpxchg_inatomic\n"
	"	.syntax unified\n"
	"1:	" TUSER(ldr) "	%1, [%4]\n"
	"	teq	%1, %2\n"
	"	it	eq	@ explicit IT needed for the 2b label\n"
	"2:	" TUSERCOND(str, eq) "	%3, [%4]\n"
	__futex_atomic_ex_table("%5")
	: "+r" (ret), "=&r" (val)
	: "r" (oldval), "r" (newval), "r" (uaddr), "Ir" (-EFAULT)
	: "cc", "memory");
	uaccess_restore(__ua_flags);

*uval = val;
	preempt_enable();

return ret;
}

#endif /* !SMP */

static inline int
arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
{
	int oldval = 0, ret, tmp;

if (!access_ok(uaddr, sizeof(u32)))
		return -EFAULT;

#ifndef CONFIG_SMP
	preempt_disable();
#endif

switch (op) {
	case FUTEX_OP_SET:
		__futex_atomic_op("mov	%0, %4", ret, oldval, tmp, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op("add	%0, %1, %4", ret, oldval, tmp, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op("orr	%0, %1, %4", ret, oldval, tmp, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op("and	%0, %1, %4", ret, oldval, tmp, uaddr, ~oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op("eor	%0, %1, %4", ret, oldval, tmp, uaddr, oparg);
		break;
	default:
		ret = -ENOSYS;
	}

#ifndef CONFIG_SMP
	preempt_enable();
#endif

/*
	 * Store unconditionally. If ret != 0 the extra store is the least
	 * of the worries but GCC cannot figure out that __futex_atomic_op()
	 * is either setting ret to -EFAULT or storing the old value in
	 * oldval which results in a uninitialized warning at the call site.
	 */
	*oval = oldval;

return ret;
}

#endif /* __KERNEL__ */
#endif /* _ASM_ARM_FUTEX_H */

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