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