Lines Matching +full:byte +full:- +full:len
8 * Returns: -EFAULT if exception before terminator, N if the entire
20 * char *__strncpy_user(char *dst, const char *src, size_t len)
40 # a4/ len
54 # a2/ dst, a3/ src, a4/ len
56 beqz a4, .Lret # if len is zero
57 movi a5, MASK0 # mask for byte 0
58 movi a6, MASK1 # mask for byte 1
59 movi a7, MASK2 # mask for byte 2
60 movi a8, MASK3 # mask for byte 3
61 bbsi.l a3, 0, .Lsrc1mod2 # if only 8-bit aligned
62 bbsi.l a3, 1, .Lsrc2mod4 # if only 16-bit aligned
63 .Lsrcaligned: # return here when src is word-aligned
70 EX(11f) l8ui a9, a3, 0 # get byte 0
72 EX(10f) s8i a9, a11, 0 # store byte 0
73 beqz a9, .Lret # if byte 0 is zero
75 addi a4, a4, -1 # decrement len
76 beqz a4, .Lret # if len is zero
77 bbci.l a3, 1, .Lsrcaligned # if src is now word-aligned
80 EX(11f) l8ui a9, a3, 0 # get byte 0
81 /* 1-cycle interlock */
82 EX(10f) s8i a9, a11, 0 # store byte 0
83 beqz a9, .Lret # if byte 0 is zero
85 addi a4, a4, -1 # decrement len
86 beqz a4, .Lret # if len is zero
87 EX(11f) l8ui a9, a3, 1 # get byte 0
89 EX(10f) s8i a9, a11, 0 # store byte 0
90 beqz a9, .Lret # if byte 0 is zero
92 addi a4, a4, -1 # decrement len
93 bnez a4, .Lsrcaligned # if len is nonzero
99 * dst is word-aligned, src is word-aligned
102 .byte 0 # (0 mod 4 alignment for LBEG)
114 bnone a9, a5, .Lz0 # if byte 0 is zero
115 bnone a9, a6, .Lz1 # if byte 1 is zero
116 bnone a9, a7, .Lz2 # if byte 2 is zero
118 bnone a9, a8, .Lz3 # if byte 3 is zero
130 bnone a9, a7, .Lz0 # if byte 2 is zero
131 bnone a9, a8, .Lz1 # if byte 3 is zero
133 bnone a9, a5, .Lz0 # if byte 0 is zero
134 bnone a9, a6, .Lz1 # if byte 1 is zero
143 beqz a9, .Lret # if byte is zero
144 addi a11, a11, 1-3 # advance dst ptr 1, but also cancel
148 .Lz3: # byte 3 is zero
152 .Lz0: # byte 0 is zero
159 .Lz1: # byte 1 is zero
167 .Lz2: # byte 2 is zero
179 .byte 0 # (0 mod 4 alignment for LBEG)
182 * for now just use byte copy loop
209 /* For now, just return -EFAULT. Future implementations might
216 movi a2, -EFAULT