FM / asm

/usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/arch/x86/include/asm/

/usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/arch/x86/include/asm

Name	Size	Mode	Actions
crypto/	-	0755	rm
e820/	-	0755	rm
fpu/	-	0755	rm
numachip/	-	0755	rm
shared/	-	0755	rm
trace/	-	0755	rm
uv/	-	0755	rm
vdso/	-	0755	rm
xen/	-	0755	rm
a.out-core.h	1931	0644	edit dl rm
acenv.h	1596	0644	edit dl rm
acpi.h	5300	0644	edit dl rm
agp.h	1070	0644	edit dl rm
alternative.h	11407	0644	edit dl rm
amd-ibs.h	5020	0644	edit dl rm
amd_hsmp.h	364	0644	edit dl rm
amd_nb.h	3086	0644	edit dl rm
apb_timer.h	1466	0644	edit dl rm
apic.h	14661	0644	edit dl rm
apicdef.h	11565	0644	edit dl rm
apic_flat_64.h	151	0644	edit dl rm
apm.h	1768	0644	edit dl rm
archrandom.h	3221	0644	edit dl rm
arch_hweight.h	1311	0644	edit dl rm
asm-offsets.h	35	0644	edit dl rm
asm-prototypes.h	946	0644	edit dl rm
asm.h	5186	0644	edit dl rm
atomic.h	6279	0644	edit dl rm
atomic64_32.h	8150	0644	edit dl rm
atomic64_64.h	5933	0644	edit dl rm
audit.h	170	0644	edit dl rm
barrier.h	2471	0644	edit dl rm
bios_ebda.h	914	0644	edit dl rm
bitops.h	10727	0644	edit dl rm
boot.h	1825	0644	edit dl rm
bootparam_utils.h	2907	0644	edit dl rm
bug.h	2117	0644	edit dl rm
bugs.h	533	0644	edit dl rm
cache.h	641	0644	edit dl rm
cacheflush.h	306	0644	edit dl rm
cacheinfo.h	209	0644	edit dl rm
calgary.h	2370	0644	edit dl rm
ce4100.h	121	0644	edit dl rm
checksum.h	133	0644	edit dl rm
checksum_32.h	4964	0644	edit dl rm
checksum_64.h	5541	0644	edit dl rm
clocksource.h	480	0644	edit dl rm
cmdline.h	302	0644	edit dl rm
cmpxchg.h	7891	0644	edit dl rm
cmpxchg_32.h	3247	0644	edit dl rm
cmpxchg_64.h	552	0644	edit dl rm
coco.h	482	0644	edit dl rm
compat.h	4861	0644	edit dl rm
cpu.h	2607	0644	edit dl rm
cpufeature.h	9470	0644	edit dl rm
cpufeatures.h	32845	0644	edit dl rm
cpuid.h	498	0644	edit dl rm
cpuidle_haltpoll.h	189	0644	edit dl rm
cpumask.h	408	0644	edit dl rm
cpu_device_id.h	8109	0644	edit dl rm
cpu_entry_area.h	4162	0644	edit dl rm
crash.h	300	0644	edit dl rm
current.h	443	0644	edit dl rm
debugreg.h	3411	0644	edit dl rm
delay.h	275	0644	edit dl rm
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device.h	328	0644	edit dl rm
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elf.h	12640	0644	edit dl rm
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emulate_prefix.h	484	0644	edit dl rm
enclu.h	181	0644	edit dl rm
entry_arch.h	1922	0644	edit dl rm
espfix.h	426	0644	edit dl rm
exec.h	37	0644	edit dl rm
export.h	120	0644	edit dl rm
extable.h	1300	0644	edit dl rm
fb.h	540	0644	edit dl rm
fixmap.h	6381	0644	edit dl rm
floppy.h	6748	0644	edit dl rm
frame.h	2237	0644	edit dl rm
fsgsbase.h	2072	0644	edit dl rm
ftrace.h	2777	0644	edit dl rm
futex.h	2269	0644	edit dl rm
gart.h	2682	0644	edit dl rm
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hardirq.h	2207	0644	edit dl rm
highmem.h	2466	0644	edit dl rm
hpet.h	3461	0644	edit dl rm
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hw_irq.h	4126	0644	edit dl rm
hyperv-tlfs.h	22337	0644	edit dl rm
hypervisor.h	1975	0644	edit dl rm
i8259.h	1975	0644	edit dl rm
ia32.h	1789	0644	edit dl rm
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init.h	632	0644	edit dl rm
insn-eval.h	1546	0644	edit dl rm
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inst.h	5453	0644	edit dl rm
intel-family.h	5168	0644	edit dl rm
intel-mid.h	5025	0644	edit dl rm
intel_ds.h	849	0644	edit dl rm
intel_mid_vrtc.h	330	0644	edit dl rm
intel_pconfig.h	1545	0644	edit dl rm
intel_pmc_ipc.h	2267	0644	edit dl rm
intel_pt.h	1276	0644	edit dl rm
intel_punit_ipc.h	4666	0644	edit dl rm
intel_scu_ipc.h	2351	0644	edit dl rm
intel_telemetry.h	4060	0644	edit dl rm
invpcid.h	1604	0644	edit dl rm
io.h	11872	0644	edit dl rm
iomap.h	1228	0644	edit dl rm
iommu.h	935	0644	edit dl rm
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Kbuild	319	0644	edit dl rm
kdebug.h	1042	0644	edit dl rm
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kvm_types.h	178	0644	edit dl rm
kvm_vcpu_regs.h	606	0644	edit dl rm
linkage.h	1268	0644	edit dl rm
livepatch.h	1039	0644	edit dl rm
local.h	3925	0644	edit dl rm
local64.h	33	0644	edit dl rm
mach_timer.h	1590	0644	edit dl rm
mach_traps.h	1013	0644	edit dl rm
math_emu.h	395	0644	edit dl rm
mc146818rtc.h	2835	0644	edit dl rm
mce.h	11909	0644	edit dl rm
mcsafe_test.h	1418	0644	edit dl rm
memtype.h	815	0644	edit dl rm
mem_encrypt.h	3543	0644	edit dl rm
microcode.h	3557	0644	edit dl rm
microcode_amd.h	1373	0644	edit dl rm
microcode_intel.h	2619	0644	edit dl rm
misc.h	143	0644	edit dl rm
mmconfig.h	374	0644	edit dl rm
mmu.h	1689	0644	edit dl rm
mmu_context.h	10118	0644	edit dl rm
mmx.h	337	0644	edit dl rm
mmzone.h	129	0644	edit dl rm
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mmzone_64.h	430	0644	edit dl rm
module.h	2096	0644	edit dl rm
mpspec.h	4023	0644	edit dl rm
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mpx.h	3125	0644	edit dl rm
mshyperv.h	10142	0644	edit dl rm
msi.h	1508	0644	edit dl rm
msidef.h	1814	0644	edit dl rm
msr-index.h	42400	0644	edit dl rm
msr-trace.h	1387	0644	edit dl rm
msr.h	11290	0644	edit dl rm
mtrr.h	4753	0644	edit dl rm
mwait.h	4968	0644	edit dl rm
nmi.h	1496	0644	edit dl rm
nops.h	4412	0644	edit dl rm
nospec-branch.h	14205	0644	edit dl rm
numa.h	2228	0644	edit dl rm
numa_32.h	256	0644	edit dl rm
olpc.h	3240	0644	edit dl rm
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orc_lookup.h	1665	0644	edit dl rm
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pci-direct.h	740	0644	edit dl rm
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pci.h	3288	0644	edit dl rm
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pgalloc.h	6591	0644	edit dl rm
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platform_sst_audio.h	3290	0644	edit dl rm
pm-trace.h	611	0644	edit dl rm
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processor-cyrix.h	879	0644	edit dl rm
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pvclock-abi.h	1530	0644	edit dl rm
pvclock.h	2702	0644	edit dl rm
qrwlock.h	199	0644	edit dl rm
qspinlock.h	2598	0644	edit dl rm
qspinlock_paravirt.h	1908	0644	edit dl rm
realmode.h	2064	0644	edit dl rm
reboot.h	898	0644	edit dl rm
reboot_fixups.h	183	0644	edit dl rm
refcount.h	2911	0644	edit dl rm
required-features.h	3043	0644	edit dl rm
resctrl.h	3064	0644	edit dl rm
rio.h	2630	0644	edit dl rm
rmwcc.h	2259	0644	edit dl rm
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segment.h	11184	0644	edit dl rm
serial.h	1137	0644	edit dl rm
setup.h	3751	0644	edit dl rm
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sev-common.h	4867	0644	edit dl rm
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sgx.h	13157	0644	edit dl rm
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signal.h	2424	0644	edit dl rm
simd.h	287	0644	edit dl rm
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sta2x11.h	352	0644	edit dl rm
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topology.h	6654	0644	edit dl rm
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tsc.h	1950	0644	edit dl rm
uaccess.h	21233	0644	edit dl rm
uaccess_32.h	1006	0644	edit dl rm
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umip.h	329	0644	edit dl rm
unaligned.h	345	0644	edit dl rm
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user.h	2257	0644	edit dl rm
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Edit: /usr/src/kernels/4.18.0-553.121.1.el8_10.x86_64/arch/x86/include/asm/uaccess.h (21233B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_UACCESS_H
#define _ASM_X86_UACCESS_H
/*
 * User space memory access functions
 */
#include <linux/compiler.h>
#include <linux/kasan-checks.h>
#include <linux/string.h>
#include <asm/asm.h>
#include <asm/page.h>
#include <asm/smap.h>
#include <asm/extable.h>

/*
 * The fs value determines whether argument validity checking should be
 * performed or not.  If get_fs() == USER_DS, checking is performed, with
 * get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons, these macros are grossly misnamed.
 */

#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })

#define KERNEL_DS	MAKE_MM_SEG(-1UL)
#define USER_DS 	MAKE_MM_SEG(TASK_SIZE_MAX)

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current->thread.addr_limit)

static inline void set_fs(mm_segment_t fs)
{
	current->thread.addr_limit = fs;
	/* On user-mode return, check fs is correct */
	set_thread_flag(TIF_FSCHECK);
}

#define segment_eq(a, b)	((a).seg == (b).seg)

#define user_addr_max() (current->thread.addr_limit.seg)
#define __addr_ok(addr) 	\
	((unsigned long __force)(addr) < user_addr_max())

/*
 * Test whether a block of memory is a valid user space address.
 * Returns 0 if the range is valid, nonzero otherwise.
 */
static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
{
	/*
	 * If we have used "sizeof()" for the size,
	 * we know it won't overflow the limit (but
	 * it might overflow the 'addr', so it's
	 * important to subtract the size from the
	 * limit, not add it to the address).
	 */
	if (__builtin_constant_p(size))
		return unlikely(addr > limit - size);

/* Arbitrary sizes? Be careful about overflow */
	addr += size;
	if (unlikely(addr < size))
		return true;
	return unlikely(addr > limit);
}

#define __range_not_ok(addr, size, limit)				\
({									\
	__chk_user_ptr(addr);						\
	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
})

#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
# define WARN_ON_IN_IRQ()	WARN_ON_ONCE(!in_task())
#else
# define WARN_ON_IN_IRQ()
#endif

/**
 * access_ok: - Checks if a user space pointer is valid
 * @addr: User space pointer to start of block to check
 * @size: Size of block to check
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * Checks if a pointer to a block of memory in user space is valid.
 *
 * Returns true (nonzero) if the memory block may be valid, false (zero)
 * if it is definitely invalid.
 *
 * Note that, depending on architecture, this function probably just
 * checks that the pointer is in the user space range - after calling
 * this function, memory access functions may still return -EFAULT.
 */
#define access_ok(addr, size)					\
({									\
	WARN_ON_IN_IRQ();						\
	likely(!__range_not_ok(addr, size, user_addr_max()));		\
})

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */

extern int __get_user_1(void);
extern int __get_user_2(void);
extern int __get_user_4(void);
extern int __get_user_8(void);
extern int __get_user_bad(void);

#define __uaccess_begin() stac()
#define __uaccess_end()   clac()
#define __uaccess_begin_nospec()	\
({					\
	stac();				\
	barrier_nospec();		\
})

/*
 * This is a type: either unsigned long, if the argument fits into
 * that type, or otherwise unsigned long long.
 */
#define __inttype(x) \
__typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))

/**
 * get_user: - Get a simple variable from user space.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */
/*
 * Careful: we have to cast the result to the type of the pointer
 * for sign reasons.
 *
 * The use of _ASM_DX as the register specifier is a bit of a
 * simplification, as gcc only cares about it as the starting point
 * and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
 * (%ecx being the next register in gcc's x86 register sequence), and
 * %rdx on 64 bits.
 *
 * Clang/LLVM cares about the size of the register, but still wants
 * the base register for something that ends up being a pair.
 */
#define get_user(x, ptr)						\
({									\
	int __ret_gu;							\
	register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX);		\
	__chk_user_ptr(ptr);						\
	might_fault();							\
	asm volatile("call __get_user_%P4"				\
		     : "=a" (__ret_gu), "=r" (__val_gu),		\
			ASM_CALL_CONSTRAINT				\
		     : "0" (ptr), "i" (sizeof(*(ptr))));		\
	(x) = (__force __typeof__(*(ptr))) __val_gu;			\
	__builtin_expect(__ret_gu, 0);					\
})

#define __put_user_x(size, x, ptr, __ret_pu)			\
	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")

#ifdef CONFIG_X86_32
#define __put_user_asm_u64(x, addr, err, errret)			\
	asm volatile("\n"						\
		     "1:	movl %%eax,0(%2)\n"			\
		     "2:	movl %%edx,4(%2)\n"			\
		     "3:"						\
		     ".section .fixup,\"ax\"\n"				\
		     "4:	movl %3,%0\n"				\
		     "	jmp 3b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_UA(1b, 4b)				\
		     _ASM_EXTABLE_UA(2b, 4b)				\
		     : "=r" (err)					\
		     : "A" (x), "r" (addr), "i" (errret), "0" (err))

#define __put_user_asm_ex_u64(x, addr)					\
	asm volatile("\n"						\
		     "1:	movl %%eax,0(%1)\n"			\
		     "2:	movl %%edx,4(%1)\n"			\
		     "3:"						\
		     _ASM_EXTABLE_EX(1b, 2b)				\
		     _ASM_EXTABLE_EX(2b, 3b)				\
		     : : "A" (x), "r" (addr))

#define __put_user_x8(x, ptr, __ret_pu)				\
	asm volatile("call __put_user_8" : "=a" (__ret_pu)	\
		     : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")
#else
#define __put_user_asm_u64(x, ptr, retval, errret) \
	__put_user_asm(x, ptr, retval, "q", "", "er", errret)
#define __put_user_asm_ex_u64(x, addr)	\
	__put_user_asm_ex(x, addr, "q", "", "er")
#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu)
#endif

extern void __put_user_bad(void);

/*
 * Strange magic calling convention: pointer in %ecx,
 * value in %eax(:%edx), return value in %eax. clobbers %rbx
 */
extern void __put_user_1(void);
extern void __put_user_2(void);
extern void __put_user_4(void);
extern void __put_user_8(void);

/**
 * put_user: - Write a simple value into user space.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Returns zero on success, or -EFAULT on error.
 */
#define put_user(x, ptr)					\
({								\
	int __ret_pu;						\
	__typeof__(*(ptr)) __pu_val;				\
	__chk_user_ptr(ptr);					\
	might_fault();						\
	__pu_val = x;						\
	switch (sizeof(*(ptr))) {				\
	case 1:							\
		__put_user_x(1, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 2:							\
		__put_user_x(2, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 4:							\
		__put_user_x(4, __pu_val, ptr, __ret_pu);	\
		break;						\
	case 8:							\
		__put_user_x8(__pu_val, ptr, __ret_pu);		\
		break;						\
	default:						\
		__put_user_x(X, __pu_val, ptr, __ret_pu);	\
		break;						\
	}							\
	__builtin_expect(__ret_pu, 0);				\
})

#define __put_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm(x, ptr, retval, "b", "b", "iq", errret);	\
		break;							\
	case 2:								\
		__put_user_asm(x, ptr, retval, "w", "w", "ir", errret);	\
		break;							\
	case 4:								\
		__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);	\
		break;							\
	case 8:								\
		__put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval,	\
				   errret);				\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

/*
 * This doesn't do __uaccess_begin/end - the exception handling
 * around it must do that.
 */
#define __put_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__put_user_asm_ex(x, ptr, "b", "b", "iq");		\
		break;							\
	case 2:								\
		__put_user_asm_ex(x, ptr, "w", "w", "ir");		\
		break;							\
	case 4:								\
		__put_user_asm_ex(x, ptr, "l", "k", "ir");		\
		break;							\
	case 8:								\
		__put_user_asm_ex_u64((__typeof__(*ptr))(x), ptr);	\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

#ifdef CONFIG_X86_32
#define __get_user_asm_u64(x, ptr, retval, errret)			\
({									\
	__typeof__(ptr) __ptr = (ptr);					\
	asm volatile("\n"					\
		     "1:	movl %2,%%eax\n"			\
		     "2:	movl %3,%%edx\n"			\
		     "3:\n"				\
		     ".section .fixup,\"ax\"\n"				\
		     "4:	mov %4,%0\n"				\
		     "	xorl %%eax,%%eax\n"				\
		     "	xorl %%edx,%%edx\n"				\
		     "	jmp 3b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_UA(1b, 4b)				\
		     _ASM_EXTABLE_UA(2b, 4b)				\
		     : "=r" (retval), "=&A"(x)				\
		     : "m" (__m(__ptr)), "m" __m(((u32 __user *)(__ptr)) + 1),	\
		       "i" (errret), "0" (retval));			\
})

#define __get_user_asm_ex_u64(x, ptr)			(x) = __get_user_bad()
#else
#define __get_user_asm_u64(x, ptr, retval, errret) \
	 __get_user_asm(x, ptr, retval, "q", "", "=r", errret)
#define __get_user_asm_ex_u64(x, ptr) \
	 __get_user_asm_ex(x, ptr, "q", "", "=r")
#endif

#define __get_user_size(x, ptr, size, retval, errret)			\
do {									\
	retval = 0;							\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm(x, ptr, retval, "b", "b", "=q", errret);	\
		break;							\
	case 2:								\
		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
		break;							\
	case 4:								\
		__get_user_asm(x, ptr, retval, "l", "k", "=r", errret);	\
		break;							\
	case 8:								\
		__get_user_asm_u64(x, ptr, retval, errret);		\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("\n"						\
		     "1:	mov"itype" %2,%"rtype"1\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_UA(1b, 3b)				\
		     : "=r" (err), ltype(x)				\
		     : "m" (__m(addr)), "i" (errret), "0" (err))

/*
 * This doesn't do __uaccess_begin/end - the exception handling
 * around it must do that.
 */
#define __get_user_size_ex(x, ptr, size)				\
do {									\
	__chk_user_ptr(ptr);						\
	switch (size) {							\
	case 1:								\
		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
		break;							\
	case 2:								\
		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\
		break;							\
	case 4:								\
		__get_user_asm_ex(x, ptr, "l", "k", "=r");		\
		break;							\
	case 8:								\
		__get_user_asm_ex_u64(x, ptr);				\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
                     "3:xor"itype" %"rtype"0,%"rtype"0\n"		\
		     "  jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_EX(1b, 3b)				\
		     : ltype(x) : "m" (__m(addr)))

#define __put_user_nocheck(x, ptr, size)			\
({								\
	int __pu_err;						\
	__uaccess_begin();					\
	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
	__uaccess_end();					\
	__builtin_expect(__pu_err, 0);				\
})

#define __get_user_nocheck(x, ptr, size)				\
({									\
	int __gu_err;							\
	__inttype(*(ptr)) __gu_val;					\
	__uaccess_begin_nospec();					\
	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT);	\
	__uaccess_end();						\
	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
	__builtin_expect(__gu_err, 0);					\
})

/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

/*
 * Tell gcc we read from memory instead of writing: this is because
 * we do not write to any memory gcc knows about, so there are no
 * aliasing issues.
 */
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
	asm volatile("\n"						\
		     "1:	mov"itype" %"rtype"1,%2\n"		\
		     "2:\n"						\
		     ".section .fixup,\"ax\"\n"				\
		     "3:	mov %3,%0\n"				\
		     "	jmp 2b\n"					\
		     ".previous\n"					\
		     _ASM_EXTABLE_UA(1b, 3b)				\
		     : "=r"(err)					\
		     : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))

#define __put_user_asm_ex(x, addr, itype, rtype, ltype)			\
	asm volatile("1:	mov"itype" %"rtype"0,%1\n"		\
		     "2:\n"						\
		     _ASM_EXTABLE_EX(1b, 2b)				\
		     : : ltype(x), "m" (__m(addr)))

/*
 * uaccess_try and catch
 */
#define uaccess_try	do {						\
	current->thread.uaccess_err = 0;				\
	__uaccess_begin();						\
	barrier();

#define uaccess_try_nospec do {						\
	current->thread.uaccess_err = 0;				\
	__uaccess_begin_nospec();					\

#define uaccess_catch(err)						\
	__uaccess_end();						\
	(err) |= (current->thread.uaccess_err ? -EFAULT : 0);		\
} while (0)

/**
 * __get_user: - Get a simple variable from user space, with less checking.
 * @x:   Variable to store result.
 * @ptr: Source address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple variable from user space to kernel
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and the result of
 * dereferencing @ptr must be assignable to @x without a cast.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 * On error, the variable @x is set to zero.
 */

#define __get_user(x, ptr)						\
	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))

/**
 * __put_user: - Write a simple value into user space, with less checking.
 * @x:   Value to copy to user space.
 * @ptr: Destination address, in user space.
 *
 * Context: User context only. This function may sleep if pagefaults are
 *          enabled.
 *
 * This macro copies a single simple value from kernel space to user
 * space.  It supports simple types like char and int, but not larger
 * data types like structures or arrays.
 *
 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
 * to the result of dereferencing @ptr.
 *
 * Caller must check the pointer with access_ok() before calling this
 * function.
 *
 * Returns zero on success, or -EFAULT on error.
 */

#define __put_user(x, ptr)						\
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

/*
 * {get|put}_user_try and catch
 *
 * get_user_try {
 *	get_user_ex(...);
 * } get_user_catch(err)
 */
#define get_user_try		uaccess_try_nospec
#define get_user_catch(err)	uaccess_catch(err)

#define get_user_ex(x, ptr)	do {					\
	unsigned long __gue_val;					\
	__get_user_size_ex((__gue_val), (ptr), (sizeof(*(ptr))));	\
	(x) = (__force __typeof__(*(ptr)))__gue_val;			\
} while (0)

#define put_user_try		uaccess_try
#define put_user_catch(err)	uaccess_catch(err)

#define put_user_ex(x, ptr)						\
	__put_user_size_ex((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

extern unsigned long
copy_from_user_nmi(void *to, const void __user *from, unsigned long n);
extern __must_check long
strncpy_from_user(char *dst, const char __user *src, long count);

extern __must_check long strnlen_user(const char __user *str, long n);

unsigned long __must_check clear_user(void __user *mem, unsigned long len);
unsigned long __must_check __clear_user(void __user *mem, unsigned long len);

extern void __cmpxchg_wrong_size(void)
	__compiletime_error("Bad argument size for cmpxchg");

#define __user_atomic_cmpxchg_inatomic(uval, ptr, old, new, size)	\
({									\
	int __ret = 0;							\
	__typeof__(ptr) __uval = (uval);				\
	__typeof__(*(ptr)) __old = (old);				\
	__typeof__(*(ptr)) __new = (new);				\
	__uaccess_begin_nospec();					\
	switch (size) {							\
	case 1:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgb %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE_UA(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "q" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 2:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgw %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE_UA(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 4:								\
	{								\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgl %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE_UA(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	case 8:								\
	{								\
		if (!IS_ENABLED(CONFIG_X86_64))				\
			__cmpxchg_wrong_size();				\
									\
		asm volatile("\n"					\
			"1:\t" LOCK_PREFIX "cmpxchgq %4, %2\n"		\
			"2:\n"						\
			"\t.section .fixup, \"ax\"\n"			\
			"3:\tmov     %3, %0\n"				\
			"\tjmp     2b\n"				\
			"\t.previous\n"					\
			_ASM_EXTABLE_UA(1b, 3b)				\
			: "+r" (__ret), "=a" (__old), "+m" (*(ptr))	\
			: "i" (-EFAULT), "r" (__new), "1" (__old)	\
			: "memory"					\
		);							\
		break;							\
	}								\
	default:							\
		__cmpxchg_wrong_size();					\
	}								\
	__uaccess_end();						\
	*__uval = __old;						\
	__ret;								\
})

#define user_atomic_cmpxchg_inatomic(uval, ptr, old, new)		\
({									\
	access_ok((ptr), sizeof(*(ptr))) ?		\
		__user_atomic_cmpxchg_inatomic((uval), (ptr),		\
				(old), (new), sizeof(*(ptr))) :		\
		-EFAULT;						\
})

/*
 * movsl can be slow when source and dest are not both 8-byte aligned
 */
#ifdef CONFIG_X86_INTEL_USERCOPY
extern struct movsl_mask {
	int mask;
} ____cacheline_aligned_in_smp movsl_mask;
#endif

#define ARCH_HAS_NOCACHE_UACCESS 1

#ifdef CONFIG_X86_32
# include <asm/uaccess_32.h>
#else
# include <asm/uaccess_64.h>
#endif

/*
 * The "unsafe" user accesses aren't really "unsafe", but the naming
 * is a big fat warning: you have to not only do the access_ok()
 * checking before using them, but you have to surround them with the
 * user_access_begin/end() pair.
 */
static __must_check inline bool user_access_begin(const void __user *ptr, size_t len)
{
	if (unlikely(!access_ok(ptr,len)))
		return 0;
	__uaccess_begin_nospec();
	return 1;
}
#define user_access_begin(a,b)	user_access_begin(a,b)
#define user_access_end()	__uaccess_end()

#define user_access_save()	smap_save()
#define user_access_restore(x)	smap_restore(x)

#define unsafe_put_user(x, ptr, err_label)					\
do {										\
	int __pu_err;								\
	__typeof__(*(ptr)) __pu_val = (x);					\
	__put_user_size(__pu_val, (ptr), sizeof(*(ptr)), __pu_err, -EFAULT);	\
	if (unlikely(__pu_err)) goto err_label;					\
} while (0)

#define unsafe_get_user(x, ptr, err_label)					\
do {										\
	int __gu_err;								\
	__inttype(*(ptr)) __gu_val;						\
	__get_user_size(__gu_val, (ptr), sizeof(*(ptr)), __gu_err, -EFAULT);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;				\
	if (unlikely(__gu_err)) goto err_label;					\
} while (0)

#endif /* _ASM_X86_UACCESS_H */

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