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

/*
 * User space memory access functions
 */

#include <linux/compiler.h>
#include <linux/string.h>
#include <asm/asi.h>
#include <asm/spitfire.h>
#include <asm/extable_64.h>

#include <asm/processor.h>

/*
 * Sparc64 is segmented, though more like the M68K than the I386.
 * We use the secondary ASI to address user memory, which references a
 * completely different VM map, thus there is zero chance of the user
 * doing something queer and tricking us into poking kernel memory.
 *
 * What is left here is basically what is needed for the other parts of
 * the kernel that expect to be able to manipulate, erum, "segments".
 * Or perhaps more properly, permissions.
 *
 * "For historical reasons, these macros are grossly misnamed." -Linus
 */

#define KERNEL_DS   ((mm_segment_t) { ASI_P })
#define USER_DS     ((mm_segment_t) { ASI_AIUS })	/* har har har */

#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
#define get_ds() (KERNEL_DS)

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

#define set_fs(val)								\
do {										\
	current_thread_info()->current_ds = (val).seg;				\
	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));	\
} while(0)

/*
 * 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 (__builtin_constant_p(size))
		return addr > limit - size;

	addr += size;
	if (addr < size)
		return true;

	return addr > limit;
}

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

static inline int __access_ok(const void __user * addr, unsigned long size)
{
	return 1;
}

static inline int access_ok(int type, const void __user * addr, unsigned long size)
{
	return 1;
}

void __retl_efault(void);

/* Uh, these should become 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.
 */
#define put_user(x, ptr) ({ \
	unsigned long __pu_addr = (unsigned long)(ptr); \
	__chk_user_ptr(ptr); \
	__put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
})

#define get_user(x, ptr) ({ \
	unsigned long __gu_addr = (unsigned long)(ptr); \
	__chk_user_ptr(ptr); \
	__get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
})

#define __put_user(x, ptr) put_user(x, ptr)
#define __get_user(x, ptr) get_user(x, ptr)

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

#define __put_user_nocheck(data, addr, size) ({			\
	register int __pu_ret;					\
	switch (size) {						\
	case 1: __put_user_asm(data, b, addr, __pu_ret); break;	\
	case 2: __put_user_asm(data, h, addr, __pu_ret); break;	\
	case 4: __put_user_asm(data, w, addr, __pu_ret); break;	\
	case 8: __put_user_asm(data, x, addr, __pu_ret); break;	\
	default: __pu_ret = __put_user_bad(); break;		\
	}							\
	__pu_ret;						\
})

#define __put_user_asm(x, size, addr, ret)				\
__asm__ __volatile__(							\
		"/* Put user asm, inline. */\n"				\
	"1:\t"	"st"#size "a %1, [%2] %%asi\n\t"			\
		"clr	%0\n"						\
	"2:\n\n\t"							\
		".section .fixup,#alloc,#execinstr\n\t"			\
		".align	4\n"						\
	"3:\n\t"							\
		"sethi	%%hi(2b), %0\n\t"				\
		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
		" mov	%3, %0\n\n\t"					\
		".previous\n\t"						\
		".section __ex_table,\"a\"\n\t"				\
		".align	4\n\t"						\
		".word	1b, 3b\n\t"					\
		".previous\n\n\t"					\
	       : "=r" (ret) : "r" (x), "r" (__m(addr)),			\
		 "i" (-EFAULT))

int __put_user_bad(void);

#define __get_user_nocheck(data, addr, size, type) ({			     \
	register int __gu_ret;						     \
	register unsigned long __gu_val;				     \
	switch (size) {							     \
		case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
		case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
		case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
		case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
		default:						     \
			__gu_val = 0;					     \
			__gu_ret = __get_user_bad();			     \
			break;						     \
	} 								     \
	data = (__force type) __gu_val;					     \
	 __gu_ret;							     \
})

#define __get_user_asm(x, size, addr, ret)				\
__asm__ __volatile__(							\
		"/* Get user asm, inline. */\n"				\
	"1:\t"	"ld"#size "a [%2] %%asi, %1\n\t"			\
		"clr	%0\n"						\
	"2:\n\n\t"							\
		".section .fixup,#alloc,#execinstr\n\t"			\
		".align	4\n"						\
	"3:\n\t"							\
		"sethi	%%hi(2b), %0\n\t"				\
		"clr	%1\n\t"						\
		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
		" mov	%3, %0\n\n\t"					\
		".previous\n\t"						\
		".section __ex_table,\"a\"\n\t"				\
		".align	4\n\t"						\
		".word	1b, 3b\n\n\t"					\
		".previous\n\t"						\
	       : "=r" (ret), "=r" (x) : "r" (__m(addr)),		\
		 "i" (-EFAULT))

int __get_user_bad(void);

unsigned long __must_check raw_copy_from_user(void *to,
					     const void __user *from,
					     unsigned long size);

unsigned long __must_check raw_copy_to_user(void __user *to,
					   const void *from,
					   unsigned long size);
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

unsigned long __must_check raw_copy_in_user(void __user *to,
					   const void __user *from,
					   unsigned long size);

unsigned long __must_check __clear_user(void __user *, unsigned long);

#define clear_user __clear_user

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

struct pt_regs;
unsigned long compute_effective_address(struct pt_regs *,
					unsigned int insn,
					unsigned int rd);

#endif /* _ASM_UACCESS_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 491 B 0644
agp.h File 434 B 0644
apb.h File 1.06 KB 0644
asm-offsets.h File 35 B 0644
asm-prototypes.h File 727 B 0644
asm.h File 1.08 KB 0644
asmmacro.h File 1.16 KB 0644
atomic.h File 219 B 0644
atomic_32.h File 2.26 KB 0644
atomic_64.h File 3.34 KB 0644
auxio.h File 310 B 0644
auxio_32.h File 2.55 KB 0644
auxio_64.h File 3.18 KB 0644
backoff.h File 2.7 KB 0644
barrier.h File 223 B 0644
barrier_32.h File 160 B 0644
barrier_64.h File 1.96 KB 0644
bbc.h File 9.76 KB 0644
bitext.h File 631 B 0644
bitops.h File 219 B 0644
bitops_32.h File 2.79 KB 0644
bitops_64.h File 1.64 KB 0644
btext.h File 145 B 0644
bug.h File 588 B 0644
bugs.h File 404 B 0644
cache.h File 649 B 0644
cacheflush.h File 373 B 0644
cacheflush_32.h File 1.97 KB 0644
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cachetlb_32.h File 882 B 0644
chafsr.h File 9.48 KB 0644
checksum.h File 227 B 0644
checksum_32.h File 6.81 KB 0644
checksum_64.h File 4.4 KB 0644
chmctrl.h File 7.91 KB 0644
clock.h File 231 B 0644
clocksource.h File 407 B 0644
cmpxchg.h File 223 B 0644
cmpxchg_32.h File 2.4 KB 0644
cmpxchg_64.h File 5.13 KB 0644
compat.h File 6.45 KB 0644
compat_signal.h File 565 B 0644
contregs.h File 1.9 KB 0644
cpu_type.h File 579 B 0644
cpudata.h File 378 B 0644
cpudata_32.h File 729 B 0644
cpudata_64.h File 1.13 KB 0644
current.h File 991 B 0644
dcr.h File 728 B 0644
dcu.h File 1.48 KB 0644
delay.h File 215 B 0644
delay_32.h File 907 B 0644
delay_64.h File 403 B 0644
device.h File 565 B 0644
dma-mapping.h File 632 B 0644
dma.h File 6.6 KB 0644
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ecc.h File 4.34 KB 0644
eeprom.h File 254 B 0644
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estate.h File 2.23 KB 0644
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fb.h File 680 B 0644
fbio.h File 2.26 KB 0644
fhc.h File 4.43 KB 0644
floppy.h File 219 B 0644
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fpumacro.h File 710 B 0644
ftrace.h File 800 B 0644
futex.h File 215 B 0644
futex_32.h File 82 B 0644
futex_64.h File 2.15 KB 0644
hardirq.h File 223 B 0644
hardirq_32.h File 334 B 0644
hardirq_64.h File 417 B 0644
head.h File 211 B 0644
head_32.h File 2.56 KB 0644
head_64.h File 2.13 KB 0644
hibernate.h File 421 B 0644
highmem.h File 2.02 KB 0644
hugetlb.h File 2.09 KB 0644
hvtramp.h File 782 B 0644
hw_irq.h File 88 B 0644
hypervisor.h File 110.71 KB 0644
ide.h File 2.19 KB 0644
idprom.h File 656 B 0644
intr_queue.h File 794 B 0644
io-unit.h File 2.41 KB 0644
io.h File 620 B 0644
io_32.h File 3.51 KB 0644
io_64.h File 10.66 KB 0644
ioctls.h File 358 B 0644
iommu.h File 215 B 0644
iommu_32.h File 5.73 KB 0644
iommu_64.h File 2.43 KB 0644
irq.h File 207 B 0644
irq_32.h File 526 B 0644
irq_64.h File 3.06 KB 0644
irqflags.h File 227 B 0644
irqflags_32.h File 1.03 KB 0644
irqflags_64.h File 1.91 KB 0644
jump_label.h File 1.01 KB 0644
kdebug.h File 219 B 0644
kdebug_32.h File 1.99 KB 0644
kdebug_64.h File 393 B 0644
kgdb.h File 1014 B 0644
kmap_types.h File 233 B 0644
kprobes.h File 1.41 KB 0644
ldc.h File 4.37 KB 0644
leon.h File 7.37 KB 0644
leon_amba.h File 8.09 KB 0644
leon_pci.h File 512 B 0644
lsu.h File 1.04 KB 0644
machines.h File 1.5 KB 0644
mbus.h File 2.93 KB 0644
mc146818rtc.h File 298 B 0644
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mc146818rtc_64.h File 689 B 0644
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mmu.h File 207 B 0644
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mmu_64.h File 3.14 KB 0644
mmu_context.h File 239 B 0644
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mmu_context_64.h File 4.15 KB 0644
mmzone.h File 393 B 0644
msi.h File 774 B 0644
mxcc.h File 4.33 KB 0644
nmi.h File 354 B 0644
ns87303.h File 3.22 KB 0644
obio.h File 6.26 KB 0644
openprom.h File 7.3 KB 0644
oplib.h File 215 B 0644
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oplib_64.h File 8.12 KB 0644
page.h File 274 B 0644
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page_64.h File 4.49 KB 0644
parport.h File 5.68 KB 0644
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pci.h File 207 B 0644
pci_32.h File 1.09 KB 0644
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pcic.h File 5.77 KB 0644
pcr.h File 1.85 KB 0644
percpu.h File 219 B 0644
percpu_32.h File 168 B 0644
percpu_64.h File 515 B 0644
perf_event.h File 802 B 0644
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pgtable.h File 223 B 0644
pgtable_32.h File 11.35 KB 0644
pgtable_64.h File 30.71 KB 0644
pgtsrmmu.h File 6.05 KB 0644
pil.h File 1.08 KB 0644
processor.h File 231 B 0644
processor_32.h File 3.13 KB 0644
processor_64.h File 7.58 KB 0644
prom.h File 2.02 KB 0644
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ptrace.h File 4.19 KB 0644
qrwlock.h File 205 B 0644
qspinlock.h File 215 B 0644
ross.h File 5.52 KB 0644
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traps.h File 577 B 0644
tsb.h File 12.17 KB 0644
tsunami.h File 1.85 KB 0644
ttable.h File 20.08 KB 0644
turbosparc.h File 3.78 KB 0644
uaccess.h File 363 B 0644
uaccess_32.h File 8.31 KB 0644
uaccess_64.h File 6.05 KB 0644
unaligned.h File 339 B 0644
unistd.h File 1.37 KB 0644
upa.h File 3.72 KB 0644
uprobes.h File 1.86 KB 0644
user.h File 102 B 0644
vaddrs.h File 2.02 KB 0644
vdso.h File 662 B 0644
vga.h File 964 B 0644
viking.h File 8.14 KB 0644
vio.h File 11.81 KB 0644
visasm.h File 1.51 KB 0644
vvar.h File 1.52 KB 0644
winmacro.h File 4.66 KB 0644
xor.h File 207 B 0644
xor_32.h File 7.31 KB 0644
xor_64.h File 2.5 KB 0644