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comparison gcc/config/picochip/libgccExtras/divmodsi4.asm @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 // picoChip ASM file
2 //
3 // Support for 32-bit signed division/modulus.
4 //
5 // Copyright (C) 2003, 2004, 2005, 2008, 2009 Free Software Foundation, Inc.
6 // Contributed by picoChip Designs Ltd.
7 // Maintained by Daniel Towner (daniel.towner@picochip.com)
8 //
9 // This file is free software; you can redistribute it and/or modify it
10 // under the terms of the GNU General Public License as published by the
11 // Free Software Foundation; either version 3, or (at your option) any
12 // later version.
13 //
14 // This file is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // General Public License for more details.
18 //
19 // Under Section 7 of GPL version 3, you are granted additional
20 // permissions described in the GCC Runtime Library Exception, version
21 // 3.1, as published by the Free Software Foundation.
22 //
23 // You should have received a copy of the GNU General Public License and
24 // a copy of the GCC Runtime Library Exception along with this program;
25 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 // <http://www.gnu.org/licenses/>.
27
28 .section .text
29
30 .align 8
31 .global __divmodsi4
32 __divmodsi4:
33 _picoMark_FUNCTION_BEGIN=
34 // picoChip Function Prologue : &__divmodsi4 = 8 bytes
35
36 // Note: optimising for size is preferred over optimising for speed.
37
38 // Note: the frame is setup throughout the following instructions,
39 // and is complete at the point the udivmodsi4 function is called.
40
41 // Note that R9 is encoded with a pattern which indicates
42 // whether the remainder and quotient should be negated on
43 // completion. The MSB is set to the sign of the dividend
44 // (i.e., the sign of the remainder), while the LSB encodes
45 // the XOR of the two input's signs (i.e., the sign of the
46 // quotient.
47
48 // If dividend is negative, invert the dividend and flag.
49 ASR.0 r1,15,r4
50 BEQ dividendNotNegative
51 =-> STL R[9:8],(FP)-2
52
53 // Dividend is negative - negate dividend.
54 SUB.0 0,R0,R0
55 SUBB.0 0,R1,R1
56
57 dividendNotNegative:
58
59 // If divisor is negative, invert the divisor.
60 AND.0 [lsr r3,15],1,r5
61 SUB.0 R3,0, r15
62 BGE divisorNotNegative
63 =-> XOR.0 r4,r5,r9
64
65 // Divisor is negative - negate divisor.
66 SUB.0 0,R2,R2
67 SUBB.0 0,R3,R3
68
69 divisorNotNegative:
70
71 STL R[13:12],(FP)-1 \ JL (&__udivmodsi4)
72 =-> SUB.0 FP,8,FP // udivmodsi expects the frame to be valid still.
73
74 // The LSB of R9 indicates whether the quotient should be negated.
75 AND.0 r9,1,r15
76 BEQ skipQuotientNegation
77 =-> LDL (FP)1,R[13:12] // Convenient point to restore link/fp
78
79 SUB.0 0,R4,R4
80 SUBB.0 0,R5,R5
81
82 skipQuotientNegation:
83
84 // The MSB of R9 indicates whether the remainder should be negated.
85 ASR.0 R9,15,r15
86 BEQ epilogue
87
88 SUB.0 0,R6,R6
89 SUBB.0 0,R7,R7
90
91 epilogue:
92
93 JR (R12)
94 =-> LDL (FP)-2,R[9:8]
95
96 _picoMark_FUNCTION_END=
97 // picoChip Function Epilogue : __divmodsi4
98
99 //============================================================================
100 // All DWARF information between this marker, and the END OF DWARF
101 // marker should be included in the source file. Search for
102 // FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
103 // provide the relevent information. Add markers called
104 // _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
105 // function in question.
106 //============================================================================
107
108 //============================================================================
109 // Frame information.
110 //============================================================================
111
112 .section .debug_frame
113 _picoMark_DebugFrame=
114
115 // Common CIE header.
116 .unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
117 _picoMark_CieBegin=
118 .unalignedInitLong 0xffffffff
119 .initByte 0x1 // CIE Version
120 .ascii 16#0# // CIE Augmentation
121 .uleb128 0x1 // CIE Code Alignment Factor
122 .sleb128 2 // CIE Data Alignment Factor
123 .initByte 0xc // CIE RA Column
124 .initByte 0xc // DW_CFA_def_cfa
125 .uleb128 0xd
126 .uleb128 0x0
127 .align 2
128 _picoMark_CieEnd=
129
130 // FDE
131 _picoMark_LSFDE0I900821033007563=
132 .unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
133 _picoMark_FdeBegin=
134 .unalignedInitLong _picoMark_DebugFrame // FDE CIE offset
135 .unalignedInitWord _picoMark_FUNCTION_BEGIN // FDE initial location
136 .unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
137 .initByte 0xe // DW_CFA_def_cfa_offset
138 .uleb128 0x8 // <-- FUNCTION_STACK_SIZE_GOES_HERE
139 .initByte 0x4 // DW_CFA_advance_loc4
140 .unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
141 .initByte 0xe // DW_CFA_def_cfa_offset
142 .uleb128 0x0
143 .align 2
144 _picoMark_FdeEnd=
145
146 //============================================================================
147 // Abbrevation information.
148 //============================================================================
149
150 .section .debug_abbrev
151 _picoMark_ABBREVIATIONS=
152
153 .section .debug_abbrev
154 .uleb128 0x1 // (abbrev code)
155 .uleb128 0x11 // (TAG: DW_TAG_compile_unit)
156 .initByte 0x1 // DW_children_yes
157 .uleb128 0x10 // (DW_AT_stmt_list)
158 .uleb128 0x6 // (DW_FORM_data4)
159 .uleb128 0x12 // (DW_AT_high_pc)
160 .uleb128 0x1 // (DW_FORM_addr)
161 .uleb128 0x11 // (DW_AT_low_pc)
162 .uleb128 0x1 // (DW_FORM_addr)
163 .uleb128 0x25 // (DW_AT_producer)
164 .uleb128 0x8 // (DW_FORM_string)
165 .uleb128 0x13 // (DW_AT_language)
166 .uleb128 0x5 // (DW_FORM_data2)
167 .uleb128 0x3 // (DW_AT_name)
168 .uleb128 0x8 // (DW_FORM_string)
169 .initByte 0x0
170 .initByte 0x0
171
172 .uleb128 0x2 ;# (abbrev code)
173 .uleb128 0x2e ;# (TAG: DW_TAG_subprogram)
174 .initByte 0x0 ;# DW_children_no
175 .uleb128 0x3 ;# (DW_AT_name)
176 .uleb128 0x8 ;# (DW_FORM_string)
177 .uleb128 0x11 ;# (DW_AT_low_pc)
178 .uleb128 0x1 ;# (DW_FORM_addr)
179 .uleb128 0x12 ;# (DW_AT_high_pc)
180 .uleb128 0x1 ;# (DW_FORM_addr)
181 .initByte 0x0
182 .initByte 0x0
183
184 .initByte 0x0
185
186 //============================================================================
187 // Line information. DwarfLib requires this to be present, but it can
188 // be empty.
189 //============================================================================
190
191 .section .debug_line
192 _picoMark_LINES=
193
194 //============================================================================
195 // Debug Information
196 //============================================================================
197 .section .debug_info
198
199 //Fixed header.
200 .unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
201 _picoMark_DEBUG_INFO_BEGIN=
202 .unalignedInitWord 0x2
203 .unalignedInitLong _picoMark_ABBREVIATIONS
204 .initByte 0x2
205
206 // Compile unit information.
207 .uleb128 0x1 // (DIE 0xb) DW_TAG_compile_unit)
208 .unalignedInitLong _picoMark_LINES
209 .unalignedInitWord _picoMark_FUNCTION_END
210 .unalignedInitWord _picoMark_FUNCTION_BEGIN
211 // Producer is `picoChip'
212 .ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
213 .unalignedInitWord 0xcafe // ASM language
214 .ascii 16#0# // Name. DwarfLib expects this to be present.
215
216 .uleb128 0x2 ;# (DIE DW_TAG_subprogram)
217
218 // FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
219 // digit is specified using the format 16#XX#
220 .ascii 16#5f# 16#64# 16#69# 16#76# 16#6d# 16#6f# 16#64# 16#73# 16#69# 16#34# 16#0# // Function name `_divmodsi4'
221 .unalignedInitWord _picoMark_FUNCTION_BEGIN // DW_AT_low_pc
222 .unalignedInitWord _picoMark_FUNCTION_END // DW_AT_high_pc
223
224 .initByte 0x0 // end of compile unit children.
225
226 _picoMark_DEBUG_INFO_END=
227
228 //============================================================================
229 // END OF DWARF
230 //============================================================================
231
232 .section .endFile
233 // End of picoChip ASM file