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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 | ///-------------------------------------------------------------------------- | |
61 | /// x86-specific hacking. | |
62 | ||
63 | #if CPUFAM_X86 | |
64 | ||
65 | // Set the function hooks. | |
66 | #define FUNC_PREHOOK(_) .balign 16 | |
67 | ||
68 | // Don't use the wretched AT&T syntax. It's festooned with pointless | |
69 | // punctuation, and all of the data movement is backwards. Ugh! | |
70 | .intel_syntax noprefix | |
71 | ||
72 | // Call external subroutine at ADDR, possibly via PLT. | |
73 | .macro callext addr | |
74 | #if WANT_PIC | |
75 | call \addr@PLT | |
76 | #else | |
77 | call \addr | |
78 | #endif | |
79 | .endm | |
80 | ||
81 | // Do I need to arrange a spare GOT register? | |
82 | #if WANT_PIC && CPUFAM_X86 | |
83 | # define NEED_GOT 1 | |
84 | #endif | |
85 | #define GOTREG ebx // Not needed in AMD64 so don't care. | |
86 | ||
87 | // Maybe load GOT address into GOT. | |
88 | .macro ldgot got=GOTREG | |
89 | #if WANT_PIC | |
90 | call _where_am_i.\got | |
91 | add \got, offset _GLOBAL_OFFSET_TABLE_ | |
92 | #endif | |
93 | .endm | |
94 | ||
95 | // Maybe build a helper subroutine for `ldgot GOT'. | |
96 | .macro gotaux got=GOTREG | |
97 | #if WANT_PIC | |
98 | .align 16 | |
99 | _where_am_i.\got : | |
100 | mov \got, [esp] | |
101 | ret | |
102 | #endif | |
103 | .endm | |
104 | ||
105 | // Load address of external symbol ADDR into REG, maybe using GOT. | |
106 | .macro leaext reg, addr, got=GOTREG | |
107 | #if WANT_PIC | |
108 | mov \reg, [\got + \addr@GOT] | |
109 | #else | |
110 | mov \reg, offset \addr | |
111 | #endif | |
112 | .endm | |
113 | ||
114 | // Address expression (possibly using a base register, and a displacement) | |
115 | // referring to ADDR, which is within our module, maybe using GOT. | |
116 | #define INTADDR(...) INTADDR__0(__VA_ARGS__, GOTREG, dummy) | |
117 | #define INTADDR__0(addr, got, ...) INTADDR__1(addr, got) | |
118 | #if WANT_PIC | |
119 | # define INTADDR__1(addr, got) got + addr@GOTOFF | |
120 | #else | |
121 | # define INTADDR__1(addr, got) addr | |
122 | #endif | |
123 | ||
124 | #endif | |
125 | ||
126 | ///-------------------------------------------------------------------------- | |
127 | /// Final stuff. | |
128 | ||
129 | // Default values for the various hooks. | |
130 | #ifndef FUNC_PREHOOK | |
131 | # define FUNC_PREHOOK(name) | |
132 | #endif | |
133 | #ifndef FUNC_POSTHOOK | |
134 | # define FUNC_POSTHOOK(name) | |
135 | #endif | |
136 | #ifndef ENDFUNC_HOOK | |
137 | # define ENDFUNC_HOOK(name) | |
138 | #endif | |
139 | ||
140 | #ifndef F | |
141 | # define F(name) name | |
142 | #endif | |
143 | ||
144 | #ifndef TYPE_FUNC | |
145 | # define TYPE_FUNC(name) | |
146 | #endif | |
147 | ||
148 | #ifndef SIZE_OBJ | |
149 | # define SIZE_OBJ(name) | |
150 | #endif | |
151 | ||
152 | ///----- That's all, folks -------------------------------------------------- |