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48 lines
707 B
48 lines
707 B
20 years ago
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/* strncpy_from_user.S: Sparc strncpy from userspace.
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*
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* Copyright(C) 1996 David S. Miller
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*/
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#include <asm/ptrace.h>
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#include <asm/errno.h>
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.text
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.align 4
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/* Must return:
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*
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* -EFAULT for an exception
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* count if we hit the buffer limit
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* bytes copied if we hit a null byte
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*/
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.globl __strncpy_from_user
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__strncpy_from_user:
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/* %o0=dest, %o1=src, %o2=count */
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mov %o2, %o3
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1:
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subcc %o2, 1, %o2
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bneg 2f
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nop
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10:
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ldub [%o1], %o4
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add %o0, 1, %o0
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cmp %o4, 0
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add %o1, 1, %o1
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bne 1b
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stb %o4, [%o0 - 1]
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2:
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add %o2, 1, %o0
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retl
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sub %o3, %o0, %o0
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.section .fixup,#alloc,#execinstr
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.align 4
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4:
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retl
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mov -EFAULT, %o0
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.section __ex_table,#alloc
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.align 4
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.word 10b, 4b
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