FM / asm

/usr/src/linux-headers-5.15.0-190/arch/alpha/include/asm/

/usr/src/linux-headers-5.15.0-190/arch/alpha/include/asm

Name	Size	Mode	Actions
a.out.h	574	0644	edit dl rm
agp.h	490	0644	edit dl rm
agp_backend.h	948	0644	edit dl rm
asm-offsets.h	35	0644	edit dl rm
asm-prototypes.h	505	0644	edit dl rm
atomic.h	8749	0644	edit dl rm
barrier.h	507	0644	edit dl rm
bitops.h	9039	0644	edit dl rm
bug.h	571	0644	edit dl rm
cache.h	507	0644	edit dl rm
cacheflush.h	2039	0644	edit dl rm
checksum.h	2012	0644	edit dl rm
cmpxchg.h	1928	0644	edit dl rm
compiler.h	158	0644	edit dl rm
console.h	1084	0644	edit dl rm
core_apecs.h	17338	0644	edit dl rm
core_cia.h	15817	0644	edit dl rm
core_irongate.h	6793	0644	edit dl rm
core_lca.h	11650	0644	edit dl rm
core_marvel.h	9382	0644	edit dl rm
core_mcpcia.h	11747	0644	edit dl rm
core_polaris.h	2987	0644	edit dl rm
core_t2.h	19595	0644	edit dl rm
core_titan.h	11471	0644	edit dl rm
core_tsunami.h	8485	0644	edit dl rm
core_wildfire.h	8655	0644	edit dl rm
delay.h	264	0644	edit dl rm
device.h	129	0644	edit dl rm
div64.h	31	0644	edit dl rm
dma-mapping.h	342	0644	edit dl rm
dma.h	12664	0644	edit dl rm
elf.h	5765	0644	edit dl rm
emergency-restart.h	149	0644	edit dl rm
err_common.h	3316	0644	edit dl rm
err_ev6.h	116	0644	edit dl rm
err_ev7.h	4472	0644	edit dl rm
extable.h	1459	0644	edit dl rm
floppy.h	3171	0644	edit dl rm
fpu.h	1820	0644	edit dl rm
ftrace.h	12	0644	edit dl rm
futex.h	2017	0644	edit dl rm
gct.h	1042	0644	edit dl rm
hardirq.h	223	0644	edit dl rm
hwrpb.h	7066	0644	edit dl rm
hw_irq.h	302	0644	edit dl rm
io.h	14873	0644	edit dl rm
io_trivial.h	3206	0644	edit dl rm
irq.h	2363	0644	edit dl rm
irqflags.h	1194	0644	edit dl rm
irq_regs.h	34	0644	edit dl rm
jensen.h	8603	0644	edit dl rm
Kbuild	141	0644	edit dl rm
kdebug.h	32	0644	edit dl rm
linkage.h	256	0644	edit dl rm
local.h	2654	0644	edit dl rm
machvec.h	3621	0644	edit dl rm
mc146818rtc.h	680	0644	edit dl rm
mce.h	4135	0644	edit dl rm
mmu.h	203	0644	edit dl rm
mmu_context.h	7241	0644	edit dl rm
module.h	329	0644	edit dl rm
page.h	2397	0644	edit dl rm
pal.h	5127	0644	edit dl rm
param.h	284	0644	edit dl rm
parport.h	536	0644	edit dl rm
pci.h	2733	0644	edit dl rm
percpu.h	527	0644	edit dl rm
perf_event.h	105	0644	edit dl rm
pgalloc.h	761	0644	edit dl rm
pgtable.h	12577	0644	edit dl rm
processor.h	1677	0644	edit dl rm
ptrace.h	754	0644	edit dl rm
rwonce.h	812	0644	edit dl rm
serial.h	1034	0644	edit dl rm
setup.h	1465	0644	edit dl rm
sfp-machine.h	2929	0644	edit dl rm
shmparam.h	191	0644	edit dl rm
signal.h	627	0644	edit dl rm
smp.h	1377	0644	edit dl rm
socket.h	310	0644	edit dl rm
sparsemem.h	410	0644	edit dl rm
special_insns.h	925	0644	edit dl rm
spinlock.h	2915	0644	edit dl rm
spinlock_types.h	413	0644	edit dl rm
string.h	2481	0644	edit dl rm
switch_to.h	406	0644	edit dl rm
syscall.h	379	0644	edit dl rm
termios.h	3054	0644	edit dl rm
thread_info.h	3749	0644	edit dl rm
timex.h	827	0644	edit dl rm
tlb.h	257	0644	edit dl rm
tlbflush.h	3424	0644	edit dl rm
topology.h	271	0644	edit dl rm
types.h	143	0644	edit dl rm
uaccess.h	9767	0644	edit dl rm
ucontext.h	348	0644	edit dl rm
unistd.h	561	0644	edit dl rm
user.h	2192	0644	edit dl rm
vga.h	2050	0644	edit dl rm
vmalloc.h	93	0644	edit dl rm
word-at-a-time.h	1376	0644	edit dl rm
wrperfmon.h	2623	0644	edit dl rm
xchg.h	5287	0644	edit dl rm
xor.h	21833	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/arch/alpha/include/asm/uaccess.h (9767B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ALPHA_UACCESS_H
#define __ALPHA_UACCESS_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.
 *
 * Or at least it did once upon a time.  Nowadays it is a mask that
 * defines which bits of the address space are off limits.  This is a
 * wee bit faster than the above.
 *
 * For historical reasons, these macros are grossly misnamed.
 */

#define KERNEL_DS	((mm_segment_t) { 0UL })
#define USER_DS		((mm_segment_t) { -0x40000000000UL })

#define get_fs()  (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))

#define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)

/*
 * Is a address valid? This does a straightforward calculation rather
 * than tests.
 *
 * Address valid if:
 *  - "addr" doesn't have any high-bits set
 *  - AND "size" doesn't have any high-bits set
 *  - AND "addr+size-(size != 0)" doesn't have any high-bits set
 *  - OR we are in kernel mode.
 */
#define __access_ok(addr, size) ({				\
	unsigned long __ao_a = (addr), __ao_b = (size);		\
	unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b;	\
	(get_fs().seg & (__ao_a | __ao_b | __ao_end)) == 0; })

#define access_ok(addr, size)				\
({							\
	__chk_user_ptr(addr);				\
	__access_ok(((unsigned long)(addr)), (size));	\
})

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * As the alpha uses the same address space for kernel and user
 * data, we can just do these as direct assignments.  (Of course, the
 * exception handling means that it's no longer "just"...)
 *
 * Careful to not
 * (a) re-use the arguments for side effects (sizeof/typeof is ok)
 * (b) require any knowledge of processes at this stage
 */
#define put_user(x, ptr) \
  __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define get_user(x, ptr) \
  __get_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * The "__xxx" versions do not do address space checking, useful when
 * doing multiple accesses to the same area (the programmer has to do the
 * checks by hand with "access_ok()")
 */
#define __put_user(x, ptr) \
  __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
  __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
  
/*
 * The "lda %1, 2b-1b(%0)" bits are magic to get the assembler to
 * encode the bits we need for resolving the exception.  See the
 * more extensive comments with fixup_inline_exception below for
 * more information.
 */
#define EXC(label,cont,res,err)				\
	".section __ex_table,\"a\"\n"			\
	"	.long "#label"-.\n"			\
	"	lda "#res","#cont"-"#label"("#err")\n"	\
	".previous\n"

extern void __get_user_unknown(void);

#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err = 0;					\
	unsigned long __gu_val;					\
	__chk_user_ptr(ptr);					\
	switch (size) {						\
	  case 1: __get_user_8(ptr); break;			\
	  case 2: __get_user_16(ptr); break;			\
	  case 4: __get_user_32(ptr); break;			\
	  case 8: __get_user_64(ptr); break;			\
	  default: __get_user_unknown(); break;			\
	}							\
	(x) = (__force __typeof__(*(ptr))) __gu_val;		\
	__gu_err;						\
})

#define __get_user_check(x, ptr, size)				\
({								\
	long __gu_err = -EFAULT;				\
	unsigned long __gu_val = 0;				\
	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);	\
	if (__access_ok((unsigned long)__gu_addr, size)) {	\
		__gu_err = 0;					\
		switch (size) {					\
		  case 1: __get_user_8(__gu_addr); break;	\
		  case 2: __get_user_16(__gu_addr); break;	\
		  case 4: __get_user_32(__gu_addr); break;	\
		  case 8: __get_user_64(__gu_addr); break;	\
		  default: __get_user_unknown(); break;		\
		}						\
	}							\
	(x) = (__force __typeof__(*(ptr))) __gu_val;		\
	__gu_err;						\
})

struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))

#define __get_user_64(addr)				\
	__asm__("1: ldq %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#define __get_user_32(addr)				\
	__asm__("1: ldl %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#ifdef __alpha_bwx__
/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */

#define __get_user_16(addr)				\
	__asm__("1: ldwu %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))

#define __get_user_8(addr)				\
	__asm__("1: ldbu %0,%2\n"			\
	"2:\n"						\
	EXC(1b,2b,%0,%1)				\
		: "=r"(__gu_val), "=r"(__gu_err)	\
		: "m"(__m(addr)), "1"(__gu_err))
#else
/* Unfortunately, we can't get an unaligned access trap for the sub-word
   load, so we have to do a general unaligned operation.  */

#define __get_user_16(addr)						\
{									\
	long __gu_tmp;							\
	__asm__("1: ldq_u %0,0(%3)\n"					\
	"2:	ldq_u %1,1(%3)\n"					\
	"	extwl %0,%3,%0\n"					\
	"	extwh %1,%3,%1\n"					\
	"	or %0,%1,%0\n"						\
	"3:\n"								\
	EXC(1b,3b,%0,%2)						\
	EXC(2b,3b,%0,%2)						\
		: "=&r"(__gu_val), "=&r"(__gu_tmp), "=r"(__gu_err)	\
		: "r"(addr), "2"(__gu_err));				\
}

#define __get_user_8(addr)						\
	__asm__("1: ldq_u %0,0(%2)\n"					\
	"	extbl %0,%2,%0\n"					\
	"2:\n"								\
	EXC(1b,2b,%0,%1)						\
		: "=&r"(__gu_val), "=r"(__gu_err)			\
		: "r"(addr), "1"(__gu_err))
#endif

extern void __put_user_unknown(void);

#define __put_user_nocheck(x, ptr, size)			\
({								\
	long __pu_err = 0;					\
	__chk_user_ptr(ptr);					\
	switch (size) {						\
	  case 1: __put_user_8(x, ptr); break;			\
	  case 2: __put_user_16(x, ptr); break;			\
	  case 4: __put_user_32(x, ptr); break;			\
	  case 8: __put_user_64(x, ptr); break;			\
	  default: __put_user_unknown(); break;			\
	}							\
	__pu_err;						\
})

#define __put_user_check(x, ptr, size)				\
({								\
	long __pu_err = -EFAULT;				\
	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
	if (__access_ok((unsigned long)__pu_addr, size)) {	\
		__pu_err = 0;					\
		switch (size) {					\
		  case 1: __put_user_8(x, __pu_addr); break;	\
		  case 2: __put_user_16(x, __pu_addr); break;	\
		  case 4: __put_user_32(x, __pu_addr); break;	\
		  case 8: __put_user_64(x, __pu_addr); break;	\
		  default: __put_user_unknown(); break;		\
		}						\
	}							\
	__pu_err;						\
})

/*
 * The "__put_user_xx()" macros tell gcc they read from memory
 * instead of writing: this is because they do not write to
 * any memory gcc knows about, so there are no aliasing issues
 */
#define __put_user_64(x, addr)					\
__asm__ __volatile__("1: stq %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m" (__m(addr)), "rJ" (x), "0"(__pu_err))

#define __put_user_32(x, addr)					\
__asm__ __volatile__("1: stl %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))

#ifdef __alpha_bwx__
/* Those lucky bastards with ev56 and later CPUs can do byte/word moves.  */

#define __put_user_16(x, addr)					\
__asm__ __volatile__("1: stw %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))

#define __put_user_8(x, addr)					\
__asm__ __volatile__("1: stb %r2,%1\n"				\
	"2:\n"							\
	EXC(1b,2b,$31,%0)					\
		: "=r"(__pu_err)				\
		: "m"(__m(addr)), "rJ"(x), "0"(__pu_err))
#else
/* Unfortunately, we can't get an unaligned access trap for the sub-word
   write, so we have to do a general unaligned operation.  */

#define __put_user_16(x, addr)					\
{								\
	long __pu_tmp1, __pu_tmp2, __pu_tmp3, __pu_tmp4;	\
	__asm__ __volatile__(					\
	"1:	ldq_u %2,1(%5)\n"				\
	"2:	ldq_u %1,0(%5)\n"				\
	"	inswh %6,%5,%4\n"				\
	"	inswl %6,%5,%3\n"				\
	"	mskwh %2,%5,%2\n"				\
	"	mskwl %1,%5,%1\n"				\
	"	or %2,%4,%2\n"					\
	"	or %1,%3,%1\n"					\
	"3:	stq_u %2,1(%5)\n"				\
	"4:	stq_u %1,0(%5)\n"				\
	"5:\n"							\
	EXC(1b,5b,$31,%0)					\
	EXC(2b,5b,$31,%0)					\
	EXC(3b,5b,$31,%0)					\
	EXC(4b,5b,$31,%0)					\
		: "=r"(__pu_err), "=&r"(__pu_tmp1), 		\
		  "=&r"(__pu_tmp2), "=&r"(__pu_tmp3), 		\
		  "=&r"(__pu_tmp4)				\
		: "r"(addr), "r"((unsigned long)(x)), "0"(__pu_err)); \
}

#define __put_user_8(x, addr)					\
{								\
	long __pu_tmp1, __pu_tmp2;				\
	__asm__ __volatile__(					\
	"1:	ldq_u %1,0(%4)\n"				\
	"	insbl %3,%4,%2\n"				\
	"	mskbl %1,%4,%1\n"				\
	"	or %1,%2,%1\n"					\
	"2:	stq_u %1,0(%4)\n"				\
	"3:\n"							\
	EXC(1b,3b,$31,%0)					\
	EXC(2b,3b,$31,%0)					\
		: "=r"(__pu_err), 				\
	  	  "=&r"(__pu_tmp1), "=&r"(__pu_tmp2)		\
		: "r"((unsigned long)(x)), "r"(addr), "0"(__pu_err)); \
}
#endif

/*
 * Complex access routines
 */

extern long __copy_user(void *to, const void *from, long len);

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long len)
{
	return __copy_user(to, (__force const void *)from, len);
}

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long len)
{
	return __copy_user((__force void *)to, from, len);
}

extern long __clear_user(void __user *to, long len);

extern inline long
clear_user(void __user *to, long len)
{
	if (__access_ok((unsigned long)to, len))
		len = __clear_user(to, len);
	return len;
}

#define user_addr_max() \
        (uaccess_kernel() ? ~0UL : TASK_SIZE)

extern long strncpy_from_user(char *dest, const char __user *src, long count);
extern __must_check long strnlen_user(const char __user *str, long n);

#include <asm/extable.h>

#endif /* __ALPHA_UACCESS_H */

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