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- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1996, 1999 by Ralf Baechle
- * Copyright (C) 2011 MIPS Technologies, Inc.
- */
- #include <linux/errno.h>
- #include <asm/asm.h>
- #include <asm/asm-offsets.h>
- #include <asm/export.h>
- #include <asm/regdef.h>
- #define EX(insn,reg,addr,handler) \
- 9: insn reg, addr; \
- .section __ex_table,"a"; \
- PTR_WD 9b, handler; \
- .previous
- /*
- * Returns: -EFAULT if exception before terminator, N if the entire
- * buffer filled, else strlen.
- */
- /*
- * 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
- * it happens at most some bytes of the exceptions handlers will be copied.
- */
- LEAF(__strncpy_from_user_asm)
- move t0, zero
- move v1, a1
- #ifdef CONFIG_EVA
- .set push
- .set eva
- 1: EX(lbue, v0, (v1), .Lfault)
- .set pop
- #else
- 1: EX(lbu, v0, (v1), .Lfault)
- #endif
- PTR_ADDIU v1, 1
- R10KCBARRIER(0(ra))
- sb v0, (a0)
- beqz v0, 2f
- PTR_ADDIU t0, 1
- PTR_ADDIU a0, 1
- 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)
- .Lfault:
- li v0, -EFAULT
- jr ra
- .section __ex_table,"a"
- PTR_WD 1b, .Lfault
- .previous
- EXPORT_SYMBOL(__strncpy_from_user_asm)
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