diff options
Diffstat (limited to 'arch/mips/lib/strncpy_user.S')
| -rw-r--r-- | arch/mips/lib/strncpy_user.S | 63 |
1 files changed, 44 insertions, 19 deletions
diff --git a/arch/mips/lib/strncpy_user.S b/arch/mips/lib/strncpy_user.S index 7201b2ff08c..3c32baf8b49 100644 --- a/arch/mips/lib/strncpy_user.S +++ b/arch/mips/lib/strncpy_user.S @@ -3,7 +3,8 @@ * License. See the file "COPYING" in the main directory of this archive * for more details. * - * Copyright (c) 1996, 1999 by Ralf Baechle + * Copyright (C) 1996, 1999 by Ralf Baechle + * Copyright (C) 2011 MIPS Technologies, Inc. */ #include <linux/errno.h> #include <asm/asm.h> @@ -23,37 +24,61 @@ /* * Ugly special case have to check: we might get passed a user space - * pointer which wraps into the kernel space. We don't deal with that. If + * pointer which wraps into the kernel space. We don't deal with that. If * it happens at most some bytes of the exceptions handlers will be copied. */ -LEAF(__strncpy_from_user_asm) + .macro __BUILD_STRNCPY_ASM func +LEAF(__strncpy_from_\func\()_asm) LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? and v0, a1 - bnez v0, .Lfault + bnez v0, .Lfault\@ -FEXPORT(__strncpy_from_user_nocheck_asm) - move v0, zero +FEXPORT(__strncpy_from_\func\()_nocheck_asm) + move t0, zero move v1, a1 - .set noreorder -1: EX(lbu, t0, (v1), .Lfault) +.ifeqs "\func","kernel" +1: EX(lbu, v0, (v1), .Lfault\@) +.else +1: EX(lbue, v0, (v1), .Lfault\@) +.endif PTR_ADDIU v1, 1 R10KCBARRIER(0(ra)) - beqz t0, 2f - sb t0, (a0) - PTR_ADDIU v0, 1 - .set reorder + sb v0, (a0) + beqz v0, 2f + PTR_ADDIU t0, 1 PTR_ADDIU a0, 1 - bne v0, a2, 1b -2: PTR_ADDU t0, a1, v0 - xor t0, a1 - bltz t0, .Lfault + bne t0, a2, 1b +2: PTR_ADDU v0, a1, t0 + xor v0, a1 + bltz v0, .Lfault\@ + move v0, t0 jr ra # return n - END(__strncpy_from_user_asm) + END(__strncpy_from_\func\()_asm) -.Lfault: li v0, -EFAULT +.Lfault\@: + li v0, -EFAULT jr ra .section __ex_table,"a" - PTR 1b, .Lfault + PTR 1b, .Lfault\@ .previous + + .endm + +#ifndef CONFIG_EVA + /* Set aliases */ + .global __strncpy_from_user_asm + .global __strncpy_from_user_nocheck_asm + .set __strncpy_from_user_asm, __strncpy_from_kernel_asm + .set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm +#endif + +__BUILD_STRNCPY_ASM kernel + +#ifdef CONFIG_EVA + .set push + .set eva +__BUILD_STRNCPY_ASM user + .set pop +#endif |