diff options
Diffstat (limited to 'arch/arm64/lib')
-rw-r--r-- | arch/arm64/lib/Makefile | 4 | ||||
-rw-r--r-- | arch/arm64/lib/bitops.c | 25 | ||||
-rw-r--r-- | arch/arm64/lib/clear_page.S | 39 | ||||
-rw-r--r-- | arch/arm64/lib/clear_user.S | 58 | ||||
-rw-r--r-- | arch/arm64/lib/copy_from_user.S | 66 | ||||
-rw-r--r-- | arch/arm64/lib/copy_in_user.S | 63 | ||||
-rw-r--r-- | arch/arm64/lib/copy_page.S | 46 | ||||
-rw-r--r-- | arch/arm64/lib/copy_to_user.S | 61 | ||||
-rw-r--r-- | arch/arm64/lib/delay.c | 55 | ||||
-rw-r--r-- | arch/arm64/lib/strncpy_from_user.S | 50 | ||||
-rw-r--r-- | arch/arm64/lib/strnlen_user.S | 47 |
11 files changed, 514 insertions, 0 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile new file mode 100644 index 00000000000..2fb7f6092aa --- /dev/null +++ b/arch/arm64/lib/Makefile | |||
@@ -0,0 +1,4 @@ | |||
1 | lib-y := bitops.o delay.o \ | ||
2 | strncpy_from_user.o strnlen_user.o clear_user.o \ | ||
3 | copy_from_user.o copy_to_user.o copy_in_user.o \ | ||
4 | copy_page.o clear_page.o | ||
diff --git a/arch/arm64/lib/bitops.c b/arch/arm64/lib/bitops.c new file mode 100644 index 00000000000..aa4965e60ac --- /dev/null +++ b/arch/arm64/lib/bitops.c | |||
@@ -0,0 +1,25 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 ARM Limited | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
11 | * GNU General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/kernel.h> | ||
18 | #include <linux/spinlock.h> | ||
19 | #include <linux/atomic.h> | ||
20 | |||
21 | #ifdef CONFIG_SMP | ||
22 | arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = { | ||
23 | [0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED | ||
24 | }; | ||
25 | #endif | ||
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S new file mode 100644 index 00000000000..ef08e905e35 --- /dev/null +++ b/arch/arm64/lib/clear_page.S | |||
@@ -0,0 +1,39 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 ARM Ltd. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
11 | * GNU General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/linkage.h> | ||
18 | #include <linux/const.h> | ||
19 | #include <asm/assembler.h> | ||
20 | #include <asm/page.h> | ||
21 | |||
22 | /* | ||
23 | * Clear page @dest | ||
24 | * | ||
25 | * Parameters: | ||
26 | * x0 - dest | ||
27 | */ | ||
28 | ENTRY(clear_page) | ||
29 | mrs x1, dczid_el0 | ||
30 | and w1, w1, #0xf | ||
31 | mov x2, #4 | ||
32 | lsl x1, x2, x1 | ||
33 | |||
34 | 1: dc zva, x0 | ||
35 | add x0, x0, x1 | ||
36 | tst x0, #(PAGE_SIZE - 1) | ||
37 | b.ne 1b | ||
38 | ret | ||
39 | ENDPROC(clear_page) | ||
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S new file mode 100644 index 00000000000..6e0ed93d51f --- /dev/null +++ b/arch/arm64/lib/clear_user.S | |||
@@ -0,0 +1,58 @@ | |||
1 | /* | ||
2 | * Based on arch/arm/lib/clear_user.S | ||
3 | * | ||
4 | * Copyright (C) 2012 ARM Ltd. | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | * You should have received a copy of the GNU General Public License | ||
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | */ | ||
18 | #include <linux/linkage.h> | ||
19 | #include <asm/assembler.h> | ||
20 | |||
21 | .text | ||
22 | |||
23 | /* Prototype: int __clear_user(void *addr, size_t sz) | ||
24 | * Purpose : clear some user memory | ||
25 | * Params : addr - user memory address to clear | ||
26 | * : sz - number of bytes to clear | ||
27 | * Returns : number of bytes NOT cleared | ||
28 | * | ||
29 | * Alignment fixed up by hardware. | ||
30 | */ | ||
31 | ENTRY(__clear_user) | ||
32 | mov x2, x1 // save the size for fixup return | ||
33 | subs x1, x1, #8 | ||
34 | b.mi 2f | ||
35 | 1: | ||
36 | USER(9f, str xzr, [x0], #8 ) | ||
37 | subs x1, x1, #8 | ||
38 | b.pl 1b | ||
39 | 2: adds x1, x1, #4 | ||
40 | b.mi 3f | ||
41 | USER(9f, str wzr, [x0], #4 ) | ||
42 | sub x1, x1, #4 | ||
43 | 3: adds x1, x1, #2 | ||
44 | b.mi 4f | ||
45 | USER(9f, strh wzr, [x0], #2 ) | ||
46 | sub x1, x1, #2 | ||
47 | 4: adds x1, x1, #1 | ||
48 | b.mi 5f | ||
49 | strb wzr, [x0] | ||
50 | 5: mov x0, #0 | ||
51 | ret | ||
52 | ENDPROC(__clear_user) | ||
53 | |||
54 | .section .fixup,"ax" | ||
55 | .align 2 | ||
56 | 9: mov x0, x2 // return the original size | ||
57 | ret | ||
58 | .previous | ||
diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S new file mode 100644 index 00000000000..5e27add9d36 --- /dev/null +++ b/arch/arm64/lib/copy_from_user.S | |||
@@ -0,0 +1,66 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 ARM Ltd. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
11 | * GNU General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/linkage.h> | ||
18 | #include <asm/assembler.h> | ||
19 | |||
20 | /* | ||
21 | * Copy from user space to a kernel buffer (alignment handled by the hardware) | ||
22 | * | ||
23 | * Parameters: | ||
24 | * x0 - to | ||
25 | * x1 - from | ||
26 | * x2 - n | ||
27 | * Returns: | ||
28 | * x0 - bytes not copied | ||
29 | */ | ||
30 | ENTRY(__copy_from_user) | ||
31 | add x4, x1, x2 // upper user buffer boundary | ||
32 | subs x2, x2, #8 | ||
33 | b.mi 2f | ||
34 | 1: | ||
35 | USER(9f, ldr x3, [x1], #8 ) | ||
36 | subs x2, x2, #8 | ||
37 | str x3, [x0], #8 | ||
38 | b.pl 1b | ||
39 | 2: adds x2, x2, #4 | ||
40 | b.mi 3f | ||
41 | USER(9f, ldr w3, [x1], #4 ) | ||
42 | sub x2, x2, #4 | ||
43 | str w3, [x0], #4 | ||
44 | 3: adds x2, x2, #2 | ||
45 | b.mi 4f | ||
46 | USER(9f, ldrh w3, [x1], #2 ) | ||
47 | sub x2, x2, #2 | ||
48 | strh w3, [x0], #2 | ||
49 | 4: adds x2, x2, #1 | ||
50 | b.mi 5f | ||
51 | USER(9f, ldrb w3, [x1] ) | ||
52 | strb w3, [x0] | ||
53 | 5: mov x0, #0 | ||
54 | ret | ||
55 | ENDPROC(__copy_from_user) | ||
56 | |||
57 | .section .fixup,"ax" | ||
58 | .align 2 | ||
59 | 9: sub x2, x4, x1 | ||
60 | mov x3, x2 | ||
61 | 10: strb wzr, [x0], #1 // zero remaining buffer space | ||
62 | subs x3, x3, #1 | ||
63 | b.ne 10b | ||
64 | mov x0, x2 // bytes not copied | ||
65 | ret | ||
66 | .previous | ||
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S new file mode 100644 index 00000000000..84b6c9bb9b9 --- /dev/null +++ b/arch/arm64/lib/copy_in_user.S | |||
@@ -0,0 +1,63 @@ | |||
1 | /* | ||
2 | * Copy from user space to user space | ||
3 | * | ||
4 | * Copyright (C) 2012 ARM Ltd. | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | * You should have received a copy of the GNU General Public License | ||
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | */ | ||
18 | |||
19 | #include <linux/linkage.h> | ||
20 | #include <asm/assembler.h> | ||
21 | |||
22 | /* | ||
23 | * Copy from user space to user space (alignment handled by the hardware) | ||
24 | * | ||
25 | * Parameters: | ||
26 | * x0 - to | ||
27 | * x1 - from | ||
28 | * x2 - n | ||
29 | * Returns: | ||
30 | * x0 - bytes not copied | ||
31 | */ | ||
32 | ENTRY(__copy_in_user) | ||
33 | add x4, x0, x2 // upper user buffer boundary | ||
34 | subs x2, x2, #8 | ||
35 | b.mi 2f | ||
36 | 1: | ||
37 | USER(9f, ldr x3, [x1], #8 ) | ||
38 | subs x2, x2, #8 | ||
39 | USER(9f, str x3, [x0], #8 ) | ||
40 | b.pl 1b | ||
41 | 2: adds x2, x2, #4 | ||
42 | b.mi 3f | ||
43 | USER(9f, ldr w3, [x1], #4 ) | ||
44 | sub x2, x2, #4 | ||
45 | USER(9f, str w3, [x0], #4 ) | ||
46 | 3: adds x2, x2, #2 | ||
47 | b.mi 4f | ||
48 | USER(9f, ldrh w3, [x1], #2 ) | ||
49 | sub x2, x2, #2 | ||
50 | USER(9f, strh w3, [x0], #2 ) | ||
51 | 4: adds x2, x2, #1 | ||
52 | b.mi 5f | ||
53 | USER(9f, ldrb w3, [x1] ) | ||
54 | USER(9f, strb w3, [x0] ) | ||
55 | 5: mov x0, #0 | ||
56 | ret | ||
57 | ENDPROC(__copy_in_user) | ||
58 | |||
59 | .section .fixup,"ax" | ||
60 | .align 2 | ||
61 | 9: sub x0, x4, x0 // bytes not copied | ||
62 | ret | ||
63 | .previous | ||
diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S new file mode 100644 index 00000000000..512b9a7b980 --- /dev/null +++ b/arch/arm64/lib/copy_page.S | |||
@@ -0,0 +1,46 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 ARM Ltd. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
11 | * GNU General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/linkage.h> | ||
18 | #include <linux/const.h> | ||
19 | #include <asm/assembler.h> | ||
20 | #include <asm/page.h> | ||
21 | |||
22 | /* | ||
23 | * Copy a page from src to dest (both are page aligned) | ||
24 | * | ||
25 | * Parameters: | ||
26 | * x0 - dest | ||
27 | * x1 - src | ||
28 | */ | ||
29 | ENTRY(copy_page) | ||
30 | /* Assume cache line size is 64 bytes. */ | ||
31 | prfm pldl1strm, [x1, #64] | ||
32 | 1: ldp x2, x3, [x1] | ||
33 | ldp x4, x5, [x1, #16] | ||
34 | ldp x6, x7, [x1, #32] | ||
35 | ldp x8, x9, [x1, #48] | ||
36 | add x1, x1, #64 | ||
37 | prfm pldl1strm, [x1, #64] | ||
38 | stnp x2, x3, [x0] | ||
39 | stnp x4, x5, [x0, #16] | ||
40 | stnp x6, x7, [x0, #32] | ||
41 | stnp x8, x9, [x0, #48] | ||
42 | add x0, x0, #64 | ||
43 | tst x1, #(PAGE_SIZE - 1) | ||
44 | b.ne 1b | ||
45 | ret | ||
46 | ENDPROC(copy_page) | ||
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S new file mode 100644 index 00000000000..a0aeeb9b7a2 --- /dev/null +++ b/arch/arm64/lib/copy_to_user.S | |||
@@ -0,0 +1,61 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2012 ARM Ltd. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify | ||
5 | * it under the terms of the GNU General Public License version 2 as | ||
6 | * published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope that it will be useful, | ||
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
11 | * GNU General Public License for more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/linkage.h> | ||
18 | #include <asm/assembler.h> | ||
19 | |||
20 | /* | ||
21 | * Copy to user space from a kernel buffer (alignment handled by the hardware) | ||
22 | * | ||
23 | * Parameters: | ||
24 | * x0 - to | ||
25 | * x1 - from | ||
26 | * x2 - n | ||
27 | * Returns: | ||
28 | * x0 - bytes not copied | ||
29 | */ | ||
30 | ENTRY(__copy_to_user) | ||
31 | add x4, x0, x2 // upper user buffer boundary | ||
32 | subs x2, x2, #8 | ||
33 | b.mi 2f | ||
34 | 1: | ||
35 | ldr x3, [x1], #8 | ||
36 | subs x2, x2, #8 | ||
37 | USER(9f, str x3, [x0], #8 ) | ||
38 | b.pl 1b | ||
39 | 2: adds x2, x2, #4 | ||
40 | b.mi 3f | ||
41 | ldr w3, [x1], #4 | ||
42 | sub x2, x2, #4 | ||
43 | USER(9f, str w3, [x0], #4 ) | ||
44 | 3: adds x2, x2, #2 | ||
45 | b.mi 4f | ||
46 | ldrh w3, [x1], #2 | ||
47 | sub x2, x2, #2 | ||
48 | USER(9f, strh w3, [x0], #2 ) | ||
49 | 4: adds x2, x2, #1 | ||
50 | b.mi 5f | ||
51 | ldrb w3, [x1] | ||
52 | USER(9f, strb w3, [x0] ) | ||
53 | 5: mov x0, #0 | ||
54 | ret | ||
55 | ENDPROC(__copy_to_user) | ||
56 | |||
57 | .section .fixup,"ax" | ||
58 | .align 2 | ||
59 | 9: sub x0, x4, x0 // bytes not copied | ||
60 | ret | ||
61 | .previous | ||
diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c new file mode 100644 index 00000000000..dad4ec9bbfd --- /dev/null +++ b/arch/arm64/lib/delay.c | |||
@@ -0,0 +1,55 @@ | |||
1 | /* | ||
2 | * Delay loops based on the OpenRISC implementation. | ||
3 | * | ||
4 | * Copyright (C) 2012 ARM Limited | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | * | ||
10 | * This program is distributed in the hope that it will be useful, | ||
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | * GNU General Public License for more details. | ||
14 | * | ||
15 | * You should have received a copy of the GNU General Public License | ||
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | * | ||
18 | * Author: Will Deacon <will.deacon@arm.com> | ||
19 | */ | ||
20 | |||
21 | #include <linux/delay.h> | ||
22 | #include <linux/init.h> | ||
23 | #include <linux/kernel.h> | ||
24 | #include <linux/module.h> | ||
25 | #include <linux/timex.h> | ||
26 | |||
27 | void __delay(unsigned long cycles) | ||
28 | { | ||
29 | cycles_t start = get_cycles(); | ||
30 | |||
31 | while ((get_cycles() - start) < cycles) | ||
32 | cpu_relax(); | ||
33 | } | ||
34 | EXPORT_SYMBOL(__delay); | ||
35 | |||
36 | inline void __const_udelay(unsigned long xloops) | ||
37 | { | ||
38 | unsigned long loops; | ||
39 | |||
40 | loops = xloops * loops_per_jiffy * HZ; | ||
41 | __delay(loops >> 32); | ||
42 | } | ||
43 | EXPORT_SYMBOL(__const_udelay); | ||
44 | |||
45 | void __udelay(unsigned long usecs) | ||
46 | { | ||
47 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ | ||
48 | } | ||
49 | EXPORT_SYMBOL(__udelay); | ||
50 | |||
51 | void __ndelay(unsigned long nsecs) | ||
52 | { | ||
53 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ | ||
54 | } | ||
55 | EXPORT_SYMBOL(__ndelay); | ||
diff --git a/arch/arm64/lib/strncpy_from_user.S b/arch/arm64/lib/strncpy_from_user.S new file mode 100644 index 00000000000..56e448a831a --- /dev/null +++ b/arch/arm64/lib/strncpy_from_user.S | |||
@@ -0,0 +1,50 @@ | |||
1 | /* | ||
2 | * Based on arch/arm/lib/strncpy_from_user.S | ||
3 | * | ||
4 | * Copyright (C) 1995-2000 Russell King | ||
5 | * Copyright (C) 2012 ARM Ltd. | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
18 | */ | ||
19 | |||
20 | #include <linux/linkage.h> | ||
21 | #include <asm/assembler.h> | ||
22 | #include <asm/errno.h> | ||
23 | |||
24 | .text | ||
25 | .align 5 | ||
26 | |||
27 | /* | ||
28 | * Copy a string from user space to kernel space. | ||
29 | * x0 = dst, x1 = src, x2 = byte length | ||
30 | * returns the number of characters copied (strlen of copied string), | ||
31 | * -EFAULT on exception, or "len" if we fill the whole buffer | ||
32 | */ | ||
33 | ENTRY(__strncpy_from_user) | ||
34 | mov x4, x1 | ||
35 | 1: subs x2, x2, #1 | ||
36 | bmi 2f | ||
37 | USER(9f, ldrb w3, [x1], #1 ) | ||
38 | strb w3, [x0], #1 | ||
39 | cbnz w3, 1b | ||
40 | sub x1, x1, #1 // take NUL character out of count | ||
41 | 2: sub x0, x1, x4 | ||
42 | ret | ||
43 | ENDPROC(__strncpy_from_user) | ||
44 | |||
45 | .section .fixup,"ax" | ||
46 | .align 0 | ||
47 | 9: strb wzr, [x0] // null terminate | ||
48 | mov x0, #-EFAULT | ||
49 | ret | ||
50 | .previous | ||
diff --git a/arch/arm64/lib/strnlen_user.S b/arch/arm64/lib/strnlen_user.S new file mode 100644 index 00000000000..7f7b176a564 --- /dev/null +++ b/arch/arm64/lib/strnlen_user.S | |||
@@ -0,0 +1,47 @@ | |||
1 | /* | ||
2 | * Based on arch/arm/lib/strnlen_user.S | ||
3 | * | ||
4 | * Copyright (C) 1995-2000 Russell King | ||
5 | * Copyright (C) 2012 ARM Ltd. | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
18 | */ | ||
19 | |||
20 | #include <linux/linkage.h> | ||
21 | #include <asm/assembler.h> | ||
22 | #include <asm/errno.h> | ||
23 | |||
24 | .text | ||
25 | .align 5 | ||
26 | |||
27 | /* Prototype: unsigned long __strnlen_user(const char *str, long n) | ||
28 | * Purpose : get length of a string in user memory | ||
29 | * Params : str - address of string in user memory | ||
30 | * Returns : length of string *including terminator* | ||
31 | * or zero on exception, or n if too long | ||
32 | */ | ||
33 | ENTRY(__strnlen_user) | ||
34 | mov x2, x0 | ||
35 | 1: subs x1, x1, #1 | ||
36 | b.mi 2f | ||
37 | USER(9f, ldrb w3, [x0], #1 ) | ||
38 | cbnz w3, 1b | ||
39 | 2: sub x0, x0, x2 | ||
40 | ret | ||
41 | ENDPROC(__strnlen_user) | ||
42 | |||
43 | .section .fixup,"ax" | ||
44 | .align 0 | ||
45 | 9: mov x0, #0 | ||
46 | ret | ||
47 | .previous | ||