projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 0131f2b2 SH |
6 | * Copyright (C) 1996, 1999 by Ralf Baechle |
| 7 | * Copyright (C) 2011 MIPS Technologies, Inc. | |
| 1da177e4 LT |
8 | */ |
| 9 | #include <linux/errno.h> | |
| 10 | #include <asm/asm.h> | |
| 048eb582 | 11 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
12 | #include <asm/regdef.h> |
| 13 | ||
| 14 | #define EX(insn,reg,addr,handler) \ | |
| 15 | 9: insn reg, addr; \ | |
| 16 | .section __ex_table,"a"; \ | |
| 17 | PTR 9b, handler; \ | |
| 18 | .previous | |
| 19 | ||
| 20 | /* | |
| 21 | * Returns: -EFAULT if exception before terminator, N if the entire | |
| 22 | * buffer filled, else strlen. | |
| 23 | */ | |
| 24 | ||
| 25 | /* | |
| 26 | * Ugly special case have to check: we might get passed a user space | |
| 70342287 | 27 | * pointer which wraps into the kernel space. We don't deal with that. If |
| 1da177e4 LT |
28 | * it happens at most some bytes of the exceptions handlers will be copied. |
| 29 | */ | |
| 30 | ||
| cc59fe5b MC |
31 | .macro __BUILD_STRNCPY_ASM func |
| 32 | LEAF(__strncpy_from_\func\()_asm) | |
| 1da177e4 LT |
33 | LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? |
| 34 | and v0, a1 | |
| cc59fe5b | 35 | bnez v0, .Lfault\@ |
| 1da177e4 | 36 | |
| cc59fe5b | 37 | FEXPORT(__strncpy_from_\func\()_nocheck_asm) |
| 0131f2b2 SH |
38 | move t0, zero |
| 39 | move v1, a1 | |
| b3c3025b | 40 | .ifeqs "\func","kernel" |
| cc59fe5b | 41 | 1: EX(lbu, v0, (v1), .Lfault\@) |
| b3c3025b MC |
42 | .else |
| 43 | 1: EX(lbue, v0, (v1), .Lfault\@) | |
| 44 | .endif | |
| 1da177e4 | 45 | PTR_ADDIU v1, 1 |
| 930bff88 | 46 | R10KCBARRIER(0(ra)) |
| 465ca5d6 | 47 | sb v0, (a0) |
| 0131f2b2 | 48 | beqz v0, 2f |
| 0131f2b2 | 49 | PTR_ADDIU t0, 1 |
| 465ca5d6 | 50 | PTR_ADDIU a0, 1 |
| 0131f2b2 | 51 | bne t0, a2, 1b |
| 0131f2b2 SH |
52 | 2: PTR_ADDU v0, a1, t0 |
| 53 | xor v0, a1 | |
| cc59fe5b | 54 | bltz v0, .Lfault\@ |
| 465ca5d6 | 55 | move v0, t0 |
| 1da177e4 | 56 | jr ra # return n |
| cc59fe5b | 57 | END(__strncpy_from_\func\()_asm) |
| 1da177e4 | 58 | |
| 465ca5d6 MR |
59 | .Lfault\@: |
| 60 | li v0, -EFAULT | |
| 61 | jr ra | |
| 1da177e4 LT |
62 | |
| 63 | .section __ex_table,"a" | |
| cc59fe5b | 64 | PTR 1b, .Lfault\@ |
| 1da177e4 | 65 | .previous |
| cc59fe5b MC |
66 | |
| 67 | .endm | |
| 68 | ||
| b3c3025b MC |
69 | #ifndef CONFIG_EVA |
| 70 | /* Set aliases */ | |
| 71 | .global __strncpy_from_user_asm | |
| 72 | .global __strncpy_from_user_nocheck_asm | |
| 73 | .set __strncpy_from_user_asm, __strncpy_from_kernel_asm | |
| 74 | .set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm | |
| 75 | #endif | |
| 76 | ||
| 77 | __BUILD_STRNCPY_ASM kernel | |
| 78 | ||
| 79 | #ifdef CONFIG_EVA | |
| 80 | .set push | |
| 81 | .set eva | |
| cc59fe5b | 82 | __BUILD_STRNCPY_ASM user |
| b3c3025b MC |
83 | .set pop |
| 84 | #endif |