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1 | /// -*- mode: asm; asm-comment-char: ?/ -*- |
2 | /// | |
3 | /// Fancy SIMD implementation of Salsa20 | |
4 | /// | |
5 | /// (c) 2015 Straylight/Edgeware | |
6 | /// | |
7 | ||
8 | ///----- Licensing notice --------------------------------------------------- | |
9 | /// | |
10 | /// This file is part of Catacomb. | |
11 | /// | |
12 | /// Catacomb is free software; you can redistribute it and/or modify | |
13 | /// it under the terms of the GNU Library General Public License as | |
14 | /// published by the Free Software Foundation; either version 2 of the | |
15 | /// License, or (at your option) any later version. | |
16 | /// | |
17 | /// Catacomb is distributed in the hope that it will be useful, | |
18 | /// but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | /// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | /// GNU Library General Public License for more details. | |
21 | /// | |
22 | /// You should have received a copy of the GNU Library General Public | |
23 | /// License along with Catacomb; if not, write to the Free | |
24 | /// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | /// MA 02111-1307, USA. | |
26 | ||
27 | ///-------------------------------------------------------------------------- | |
28 | /// General definitions. | |
29 | ||
30 | // Announcing an external function. | |
31 | #define FUNC(name) \ | |
32 | .globl F(name); \ | |
33 | TYPE_FUNC(name); \ | |
34 | .macro ENDFUNC; _ENDFUNC(name); .endm; \ | |
35 | FUNC_PREHOOK(name); \ | |
36 | F(name): \ | |
37 | FUNC_POSTHOOK(name) | |
38 | ||
39 | // Marking the end of a function. | |
40 | #define _ENDFUNC(name) \ | |
41 | .purgem ENDFUNC; \ | |
42 | SIZE_OBJ(name); \ | |
43 | ENDFUNC_HOOK(name) | |
44 | ||
45 | ///-------------------------------------------------------------------------- | |
46 | /// ELF-specific hacking. | |
47 | ||
48 | #if __ELF__ | |
49 | ||
50 | #if __PIC__ || __PIE__ | |
51 | # define WANT_PIC 1 | |
52 | #endif | |
53 | ||
54 | #define TYPE_FUNC(name) .type name, STT_FUNC | |
55 | ||
56 | #define SIZE_OBJ(name) .size name, . - name | |
57 | ||
58 | #endif | |
59 | ||
60 | ///-------------------------------------------------------------------------- | |
0f23f75f MW |
61 | /// Windows-specific hacking. |
62 | ||
63 | #if ABI_WIN | |
1a0c09c4 MW |
64 | |
65 | #if CPUFAM_X86 | |
0f23f75f MW |
66 | # define F(name) _##name |
67 | #endif | |
68 | ||
69 | #endif | |
70 | ||
71 | ///-------------------------------------------------------------------------- | |
72 | /// x86- and amd64-specific hacking. | |
73 | /// | |
74 | /// It's (slightly) easier to deal with both of these in one go. | |
75 | ||
76 | #if CPUFAM_X86 || CPUFAM_AMD64 | |
1a0c09c4 MW |
77 | |
78 | // Set the function hooks. | |
79 | #define FUNC_PREHOOK(_) .balign 16 | |
80 | ||
81 | // Don't use the wretched AT&T syntax. It's festooned with pointless | |
82 | // punctuation, and all of the data movement is backwards. Ugh! | |
83 | .intel_syntax noprefix | |
84 | ||
85 | // Call external subroutine at ADDR, possibly via PLT. | |
86 | .macro callext addr | |
87 | #if WANT_PIC | |
88 | call \addr@PLT | |
89 | #else | |
90 | call \addr | |
91 | #endif | |
92 | .endm | |
93 | ||
94 | // Do I need to arrange a spare GOT register? | |
95 | #if WANT_PIC && CPUFAM_X86 | |
96 | # define NEED_GOT 1 | |
97 | #endif | |
98 | #define GOTREG ebx // Not needed in AMD64 so don't care. | |
99 | ||
100 | // Maybe load GOT address into GOT. | |
101 | .macro ldgot got=GOTREG | |
0f23f75f | 102 | #if WANT_PIC && CPUFAM_X86 |
1a0c09c4 MW |
103 | call _where_am_i.\got |
104 | add \got, offset _GLOBAL_OFFSET_TABLE_ | |
105 | #endif | |
106 | .endm | |
107 | ||
108 | // Maybe build a helper subroutine for `ldgot GOT'. | |
109 | .macro gotaux got=GOTREG | |
0f23f75f | 110 | #if WANT_PIC && CPUFAM_X86 |
1a0c09c4 MW |
111 | .align 16 |
112 | _where_am_i.\got : | |
113 | mov \got, [esp] | |
114 | ret | |
115 | #endif | |
116 | .endm | |
117 | ||
118 | // Load address of external symbol ADDR into REG, maybe using GOT. | |
119 | .macro leaext reg, addr, got=GOTREG | |
120 | #if WANT_PIC | |
0f23f75f | 121 | # if CPUFAM_X86 |
1a0c09c4 | 122 | mov \reg, [\got + \addr@GOT] |
0f23f75f MW |
123 | # endif |
124 | # if CPUFAM_AMD64 | |
125 | mov \reg, \addr@GOTPCREL[rip] | |
126 | # endif | |
1a0c09c4 | 127 | #else |
0f23f75f | 128 | # if CPUFAM_X86 |
1a0c09c4 | 129 | mov \reg, offset \addr |
0f23f75f MW |
130 | # endif |
131 | # if CPUFAM_AMD64 | |
132 | lea \reg, \addr[rip] | |
133 | # endif | |
1a0c09c4 MW |
134 | #endif |
135 | .endm | |
136 | ||
137 | // Address expression (possibly using a base register, and a displacement) | |
138 | // referring to ADDR, which is within our module, maybe using GOT. | |
139 | #define INTADDR(...) INTADDR__0(__VA_ARGS__, GOTREG, dummy) | |
140 | #define INTADDR__0(addr, got, ...) INTADDR__1(addr, got) | |
0f23f75f MW |
141 | #if CPUFAM_AMD64 |
142 | # define INTADDR__1(addr, got) addr + rip | |
143 | #elif WANT_PIC | |
1a0c09c4 MW |
144 | # define INTADDR__1(addr, got) got + addr@GOTOFF |
145 | #else | |
146 | # define INTADDR__1(addr, got) addr | |
147 | #endif | |
148 | ||
149 | #endif | |
150 | ||
151 | ///-------------------------------------------------------------------------- | |
61bd904b MW |
152 | /// ARM-specific hacking. |
153 | ||
154 | #if CPUFAM_ARM | |
155 | ||
156 | // Set the function hooks. | |
157 | #define FUNC_PREHOOK(_) .balign 4 | |
158 | #define ENDFUNC_HOOK(name) .ltorg | |
159 | ||
160 | // Call external subroutine at ADDR, possibly via PLT. | |
161 | .macro callext addr, cond= | |
162 | #if WANT_PIC | |
163 | bl\cond \addr(PLT) | |
164 | #else | |
165 | bl\cond \addr | |
166 | #endif | |
167 | .endm | |
168 | ||
169 | // Do I need to arrange a spare GOT register? | |
170 | #if WANT_PIC | |
171 | # define NEED_GOT 1 | |
172 | #endif | |
173 | #define GOTREG r9 | |
174 | ||
175 | // Maybe load GOT address into GOT. | |
176 | .macro ldgot got=r9 | |
177 | #if WANT_PIC | |
178 | ldr \got, =_GLOBAL_OFFSET_TABLE_ - . - 12 | |
179 | add \got, pc, \got | |
180 | #endif | |
181 | .endm | |
182 | ||
183 | // Load address of external symbol ADDR into REG, maybe using GOT. | |
184 | .macro leaext reg, addr, cond=, got=GOTREG | |
185 | #if WANT_PIC | |
186 | ldr \reg, =\addr(GOT) | |
187 | ldr \reg, [\got, \reg] | |
188 | #else | |
189 | ldr \reg, =\addr | |
190 | #endif | |
191 | .endm | |
192 | ||
193 | #endif | |
194 | ||
195 | ///-------------------------------------------------------------------------- | |
1a0c09c4 MW |
196 | /// Final stuff. |
197 | ||
198 | // Default values for the various hooks. | |
199 | #ifndef FUNC_PREHOOK | |
200 | # define FUNC_PREHOOK(name) | |
201 | #endif | |
202 | #ifndef FUNC_POSTHOOK | |
203 | # define FUNC_POSTHOOK(name) | |
204 | #endif | |
205 | #ifndef ENDFUNC_HOOK | |
206 | # define ENDFUNC_HOOK(name) | |
207 | #endif | |
208 | ||
209 | #ifndef F | |
210 | # define F(name) name | |
211 | #endif | |
212 | ||
213 | #ifndef TYPE_FUNC | |
214 | # define TYPE_FUNC(name) | |
215 | #endif | |
216 | ||
217 | #ifndef SIZE_OBJ | |
218 | # define SIZE_OBJ(name) | |
219 | #endif | |
220 | ||
221 | ///----- That's all, folks -------------------------------------------------- |