1 /* SPDX-License-Identifier: GPL-2.0-or-later W
2 #include <linux/linkage.h>
3 #include <asm/asmmacro.h>
4 #include <asm/core.h>
5
6 ENTRY(__udivsi3)
7
8 abi_entry_default
9 #if XCHAL_HAVE_DIV32
10 quou a2, a2, a3
11 #else
12 bltui a3, 2, .Lle_one /* check if th
13
14 mov a6, a2 /* keep divide
15 do_nsau a5, a6, a2, a7 /* dividend_sh
16 do_nsau a4, a3, a2, a7 /* divisor_shi
17 bgeu a5, a4, .Lspecial
18
19 sub a4, a4, a5 /* count = div
20 ssl a4
21 sll a3, a3 /* divisor <<=
22 movi a2, 0 /* quotient =
23
24 /* test-subtract-and-shift loop; one q
25 #if XCHAL_HAVE_LOOPS
26 loopnez a4, .Lloopend
27 #endif /* XCHAL_HAVE_LOOPS */
28 .Lloop:
29 bltu a6, a3, .Lzerobit
30 sub a6, a6, a3
31 addi a2, a2, 1
32 .Lzerobit:
33 slli a2, a2, 1
34 srli a3, a3, 1
35 #if !XCHAL_HAVE_LOOPS
36 addi a4, a4, -1
37 bnez a4, .Lloop
38 #endif /* !XCHAL_HAVE_LOOPS */
39 .Lloopend:
40
41 bltu a6, a3, .Lreturn
42 addi a2, a2, 1 /* increment q
43 .Lreturn:
44 abi_ret_default
45
46 .Lle_one:
47 beqz a3, .Lerror /* if divisor
48 abi_ret_default
49
50 .Lspecial:
51 /* return dividend >= divisor */
52 bltu a6, a3, .Lreturn0
53 movi a2, 1
54 abi_ret_default
55
56 .Lerror:
57 /* Divide by zero: Use an illegal inst
58 The subsequent "DIV0" string can be
59 handler to identify the real cause
60 ill
61 .ascii "DIV0"
62
63 .Lreturn0:
64 movi a2, 0
65 #endif /* XCHAL_HAVE_DIV32 */
66 abi_ret_default
67
68 ENDPROC(__udivsi3)
69 EXPORT_SYMBOL(__udivsi3)
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