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(__modsi3)
7
8 abi_entry_default
9 #if XCHAL_HAVE_DIV32
10 rems a2, a2, a3
11 #else
12 mov a7, a2 /* save origin
13 do_abs a2, a2, a4 /* udividend =
14 do_abs a3, a3, a4 /* udivisor =
15 bltui a3, 2, .Lle_one /* check if ud
16 do_nsau a5, a2, a6, a8 /* udividend_s
17 do_nsau a4, a3, a6, a8 /* udivisor_sh
18 bgeu a5, a4, .Lspecial
19
20 sub a4, a4, a5 /* count = udi
21 ssl a4
22 sll a3, a3 /* udivisor <<
23
24 /* test-subtract-and-shift loop */
25 #if XCHAL_HAVE_LOOPS
26 loopnez a4, .Lloopend
27 #endif /* XCHAL_HAVE_LOOPS */
28 .Lloop:
29 bltu a2, a3, .Lzerobit
30 sub a2, a2, a3
31 .Lzerobit:
32 srli a3, a3, 1
33 #if !XCHAL_HAVE_LOOPS
34 addi a4, a4, -1
35 bnez a4, .Lloop
36 #endif /* !XCHAL_HAVE_LOOPS */
37 .Lloopend:
38
39 .Lspecial:
40 bltu a2, a3, .Lreturn
41 sub a2, a2, a3 /* subtract ag
42 .Lreturn:
43 bgez a7, .Lpositive
44 neg a2, a2 /* if (dividen
45 .Lpositive:
46 abi_ret_default
47
48 .Lle_one:
49 bnez a3, .Lreturn0
50
51 /* Divide by zero: Use an illegal inst
52 The subsequent "DIV0" string can be
53 handler to identify the real cause
54 ill
55 .ascii "DIV0"
56
57 .Lreturn0:
58 movi a2, 0
59 #endif /* XCHAL_HAVE_DIV32 */
60 abi_ret_default
61
62 ENDPROC(__modsi3)
63 EXPORT_SYMBOL(__modsi3)
64
65 #if !XCHAL_HAVE_NSA
66 .section .rodata
67 .align 4
68 .global __nsau_data
69 .type __nsau_data, @object
70 __nsau_data:
71 .byte 8, 7, 6, 6, 5, 5, 5, 5, 4, 4,
72 .byte 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
73 .byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
74 .byte 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
75 .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
76 .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
77 .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
78 .byte 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
79 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
80 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
81 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
82 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
83 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
84 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
85 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
86 .byte 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
87 .size __nsau_data, . - __nsau_data
88 #endif /* !XCHAL_HAVE_NSA */
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