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1a0c09c4 MW |
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 | ||
f8e509a9 MW |
30 | // Some useful variables. |
31 | .L$_subsec = 0 | |
32 | ||
33 | // Literal pools done the hard way. | |
34 | #define _LIT .text .L$_subsec + 1 | |
35 | #define _ENDLIT .text .L$_subsec | |
6c54cbd3 | 36 | #define _LTORG .L$_subsec = .L$_subsec + 2; .text .L$_subsec |
f8e509a9 | 37 | |
1a0c09c4 MW |
38 | // Announcing an external function. |
39 | #define FUNC(name) \ | |
40 | .globl F(name); \ | |
41 | TYPE_FUNC(name); \ | |
8a1aa284 | 42 | .macro ENDFUNC; _ENDFUNC(name); .endm; \ |
1a0c09c4 MW |
43 | FUNC_PREHOOK(name); \ |
44 | F(name): \ | |
45 | FUNC_POSTHOOK(name) | |
46 | ||
47 | // Marking the end of a function. | |
48 | #define _ENDFUNC(name) \ | |
49 | .purgem ENDFUNC; \ | |
50 | SIZE_OBJ(name); \ | |
f8e509a9 | 51 | ENDFUNC_HOOK(name); \ |
6c54cbd3 | 52 | _LTORG |
1a0c09c4 | 53 | |
8ae4c946 MW |
54 | // Make a helper function, if necessary. |
55 | #define AUXFN(name) \ | |
56 | .ifndef .L$_auxfn_def.name; \ | |
57 | .text 7128; \ | |
58 | .macro _ENDAUXFN; _ENDAUXFN_TAIL(name); .endm; \ | |
59 | FUNC_PREHOOK(name); \ | |
60 | name: | |
61 | #define _ENDAUXFN_TAIL(name) \ | |
62 | .purgem _ENDAUXFN; \ | |
63 | .text .L$_subsec; \ | |
64 | .L$_auxfn_def.name = 1 | |
65 | #define ENDAUXFN _ENDAUXFN; .endif | |
66 | ||
1a0c09c4 MW |
67 | ///-------------------------------------------------------------------------- |
68 | /// ELF-specific hacking. | |
69 | ||
70 | #if __ELF__ | |
71 | ||
72 | #if __PIC__ || __PIE__ | |
73 | # define WANT_PIC 1 | |
74 | #endif | |
75 | ||
76 | #define TYPE_FUNC(name) .type name, STT_FUNC | |
77 | ||
78 | #define SIZE_OBJ(name) .size name, . - name | |
79 | ||
80 | #endif | |
81 | ||
82 | ///-------------------------------------------------------------------------- | |
0f23f75f MW |
83 | /// Windows-specific hacking. |
84 | ||
85 | #if ABI_WIN | |
1a0c09c4 MW |
86 | |
87 | #if CPUFAM_X86 | |
0f23f75f MW |
88 | # define F(name) _##name |
89 | #endif | |
90 | ||
91 | #endif | |
92 | ||
93 | ///-------------------------------------------------------------------------- | |
94 | /// x86- and amd64-specific hacking. | |
95 | /// | |
96 | /// It's (slightly) easier to deal with both of these in one go. | |
97 | ||
98 | #if CPUFAM_X86 || CPUFAM_AMD64 | |
1a0c09c4 MW |
99 | |
100 | // Set the function hooks. | |
101 | #define FUNC_PREHOOK(_) .balign 16 | |
102 | ||
f71dd54d MW |
103 | // On Windows, arrange to install stack-unwinding data. |
104 | #if CPUFAM_AMD64 && ABI_WIN | |
105 | # define FUNC_POSTHOOK(name) .seh_proc name | |
106 | # define ENDFUNC_HOOK(_) .seh_endproc | |
107 | // Procedures are expected to invoke `.seh_setframe' if necessary, and | |
108 | // `.seh_pushreg' and friends, and `.seh_endprologue'. | |
109 | #endif | |
110 | ||
1a0c09c4 MW |
111 | // Don't use the wretched AT&T syntax. It's festooned with pointless |
112 | // punctuation, and all of the data movement is backwards. Ugh! | |
113 | .intel_syntax noprefix | |
114 | ||
115 | // Call external subroutine at ADDR, possibly via PLT. | |
8a1aa284 | 116 | .macro callext addr |
1a0c09c4 MW |
117 | #if WANT_PIC |
118 | call \addr@PLT | |
119 | #else | |
120 | call \addr | |
121 | #endif | |
8a1aa284 | 122 | .endm |
1a0c09c4 MW |
123 | |
124 | // Do I need to arrange a spare GOT register? | |
125 | #if WANT_PIC && CPUFAM_X86 | |
126 | # define NEED_GOT 1 | |
127 | #endif | |
128 | #define GOTREG ebx // Not needed in AMD64 so don't care. | |
129 | ||
130 | // Maybe load GOT address into GOT. | |
8a1aa284 | 131 | .macro ldgot got=GOTREG |
0f23f75f | 132 | #if WANT_PIC && CPUFAM_X86 |
8ae4c946 | 133 | AUXFN(_ldgot.\got) |
1a0c09c4 MW |
134 | mov \got, [esp] |
135 | ret | |
8ae4c946 MW |
136 | ENDAUXFN |
137 | call _ldgot.\got | |
138 | add \got, offset _GLOBAL_OFFSET_TABLE_ | |
1a0c09c4 | 139 | #endif |
8a1aa284 | 140 | .endm |
1a0c09c4 MW |
141 | |
142 | // Load address of external symbol ADDR into REG, maybe using GOT. | |
8a1aa284 | 143 | .macro leaext reg, addr, got=GOTREG |
1a0c09c4 | 144 | #if WANT_PIC |
0f23f75f | 145 | # if CPUFAM_X86 |
1a0c09c4 | 146 | mov \reg, [\got + \addr@GOT] |
0f23f75f MW |
147 | # endif |
148 | # if CPUFAM_AMD64 | |
149 | mov \reg, \addr@GOTPCREL[rip] | |
150 | # endif | |
1a0c09c4 | 151 | #else |
0f23f75f | 152 | # if CPUFAM_X86 |
1a0c09c4 | 153 | mov \reg, offset \addr |
0f23f75f MW |
154 | # endif |
155 | # if CPUFAM_AMD64 | |
156 | lea \reg, \addr[rip] | |
157 | # endif | |
1a0c09c4 | 158 | #endif |
8a1aa284 | 159 | .endm |
1a0c09c4 MW |
160 | |
161 | // Address expression (possibly using a base register, and a displacement) | |
162 | // referring to ADDR, which is within our module, maybe using GOT. | |
163 | #define INTADDR(...) INTADDR__0(__VA_ARGS__, GOTREG, dummy) | |
164 | #define INTADDR__0(addr, got, ...) INTADDR__1(addr, got) | |
0f23f75f MW |
165 | #if CPUFAM_AMD64 |
166 | # define INTADDR__1(addr, got) addr + rip | |
167 | #elif WANT_PIC | |
1a0c09c4 MW |
168 | # define INTADDR__1(addr, got) got + addr@GOTOFF |
169 | #else | |
170 | # define INTADDR__1(addr, got) addr | |
171 | #endif | |
172 | ||
a13b5730 MW |
173 | // Permutations for SIMD instructions. SHUF(D, C, B, A) is an immediate, |
174 | // suitable for use in `pshufd' or `shufpd', which copies element D | |
175 | // (0 <= D < 4) of the source to element 3 of the destination, element C to | |
176 | // element 2, element B to element 1, and element A to element 0. | |
177 | #define SHUF(d, c, b, a) (64*(d) + 16*(c) + 4*(b) + (a)) | |
178 | ||
1a0c09c4 MW |
179 | #endif |
180 | ||
61bd904b MW |
181 | ///-------------------------------------------------------------------------- |
182 | /// ARM-specific hacking. | |
183 | ||
59d86860 | 184 | #if CPUFAM_ARMEL |
61bd904b | 185 | |
9f6eb05d MW |
186 | // ARM/Thumb mode things. Use ARM by default. |
187 | #define ARM .arm; .L$_pcoff = 8 | |
188 | #define THUMB .thumb; .L$_pcoff = 4 | |
189 | ARM | |
190 | ||
61bd904b MW |
191 | // Set the function hooks. |
192 | #define FUNC_PREHOOK(_) .balign 4 | |
193 | #define ENDFUNC_HOOK(name) .ltorg | |
194 | ||
195 | // Call external subroutine at ADDR, possibly via PLT. | |
8a1aa284 | 196 | .macro callext addr, cond= |
61bd904b MW |
197 | #if WANT_PIC |
198 | bl\cond \addr(PLT) | |
199 | #else | |
200 | bl\cond \addr | |
201 | #endif | |
8a1aa284 | 202 | .endm |
61bd904b MW |
203 | |
204 | // Do I need to arrange a spare GOT register? | |
205 | #if WANT_PIC | |
206 | # define NEED_GOT 1 | |
207 | #endif | |
208 | #define GOTREG r9 | |
209 | ||
210 | // Maybe load GOT address into GOT. | |
8a1aa284 | 211 | .macro ldgot cond=, got=GOTREG |
61bd904b | 212 | #if WANT_PIC |
adca2a18 MW |
213 | ldr\cond \got, .L$_ldgot$\@ |
214 | .L$_ldgot_pc$\@: | |
2d03a881 | 215 | add\cond \got, pc, \got |
8a1aa284 | 216 | _LIT |
adca2a18 MW |
217 | .balign 4 |
218 | .L$_ldgot$\@: | |
9f6eb05d | 219 | .word _GLOBAL_OFFSET_TABLE_ - .L$_ldgot_pc$\@ - .L$_pcoff |
8a1aa284 | 220 | _ENDLIT |
61bd904b | 221 | #endif |
8a1aa284 | 222 | .endm |
61bd904b MW |
223 | |
224 | // Load address of external symbol ADDR into REG, maybe using GOT. | |
8a1aa284 | 225 | .macro leaext reg, addr, cond=, got=GOTREG |
61bd904b | 226 | #if WANT_PIC |
adca2a18 | 227 | ldr\cond \reg, .L$_leaext$\@ |
2d03a881 | 228 | ldr\cond \reg, [\got, \reg] |
8a1aa284 | 229 | _LIT |
adca2a18 MW |
230 | .balign 4 |
231 | .L$_leaext$\@: | |
232 | .word \addr(GOT) | |
8a1aa284 | 233 | _ENDLIT |
61bd904b | 234 | #else |
2d03a881 | 235 | ldr\cond \reg, =\addr |
61bd904b | 236 | #endif |
8a1aa284 | 237 | .endm |
61bd904b | 238 | |
0c53ac58 | 239 | // Load address of external symbol ADDR into REG directly. |
8a1aa284 | 240 | .macro leaextq reg, addr, cond= |
0c53ac58 MW |
241 | #if WANT_PIC |
242 | ldr\cond \reg, .L$_leaextq$\@ | |
243 | .L$_leaextq_pc$\@: | |
9f6eb05d | 244 | .if .L$_pcoff == 8 |
0c53ac58 | 245 | ldr\cond \reg, [pc, \reg] |
9f6eb05d MW |
246 | .else |
247 | add\cond \reg, pc | |
248 | ldr\cond \reg, [\reg] | |
249 | .endif | |
8a1aa284 | 250 | _LIT |
0c53ac58 MW |
251 | .balign 4 |
252 | .L$_leaextq$\@: | |
9f6eb05d | 253 | .word \addr(GOT_PREL) + (. - .L$_leaextq_pc$\@ - .L$_pcoff) |
8a1aa284 | 254 | _ENDLIT |
0c53ac58 MW |
255 | #else |
256 | ldr\cond \reg, =\addr | |
257 | #endif | |
8a1aa284 | 258 | .endm |
0c53ac58 | 259 | |
61bd904b MW |
260 | #endif |
261 | ||
1a0c09c4 MW |
262 | ///-------------------------------------------------------------------------- |
263 | /// Final stuff. | |
264 | ||
265 | // Default values for the various hooks. | |
266 | #ifndef FUNC_PREHOOK | |
267 | # define FUNC_PREHOOK(name) | |
268 | #endif | |
269 | #ifndef FUNC_POSTHOOK | |
270 | # define FUNC_POSTHOOK(name) | |
271 | #endif | |
272 | #ifndef ENDFUNC_HOOK | |
273 | # define ENDFUNC_HOOK(name) | |
274 | #endif | |
275 | ||
276 | #ifndef F | |
277 | # define F(name) name | |
278 | #endif | |
279 | ||
280 | #ifndef TYPE_FUNC | |
281 | # define TYPE_FUNC(name) | |
282 | #endif | |
283 | ||
284 | #ifndef SIZE_OBJ | |
285 | # define SIZE_OBJ(name) | |
286 | #endif | |
287 | ||
288 | ///----- That's all, folks -------------------------------------------------- |