| 1 |
/* |
| 2 |
* asm_linux.S - Assembly routines |
| 3 |
* |
| 4 |
* SheepShaver (C) 1997-2005 Christian Bauer and Marc Hellwig |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#include <ppc_asm.tmpl> |
| 22 |
#include <xlowmem.h> |
| 23 |
|
| 24 |
#define SAVE_FP_EXEC_68K 1 |
| 25 |
|
| 26 |
|
| 27 |
/* |
| 28 |
* void *get_sp(void) - Get stack pointer |
| 29 |
*/ |
| 30 |
|
| 31 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_sp) |
| 32 |
C_SYMBOL_NAME(get_sp): |
| 33 |
mr r3,r1 |
| 34 |
blr |
| 35 |
|
| 36 |
|
| 37 |
/* |
| 38 |
* void *get_r2(void) - Get r2 |
| 39 |
*/ |
| 40 |
|
| 41 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_r2) |
| 42 |
C_SYMBOL_NAME(get_r2): |
| 43 |
mr r3,r2 |
| 44 |
blr |
| 45 |
|
| 46 |
|
| 47 |
/* |
| 48 |
* void set_r2(void *val {r3}) - Set r2 |
| 49 |
*/ |
| 50 |
|
| 51 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(set_r2) |
| 52 |
C_SYMBOL_NAME(set_r2): |
| 53 |
mr r2,r3 |
| 54 |
blr |
| 55 |
|
| 56 |
|
| 57 |
/* |
| 58 |
* void *get_r13(void) - Get r13 (small data pointer under Linux) |
| 59 |
*/ |
| 60 |
|
| 61 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_r13) |
| 62 |
C_SYMBOL_NAME(get_r13): |
| 63 |
mr r3,r13 |
| 64 |
blr |
| 65 |
|
| 66 |
/* |
| 67 |
* void set_r13(void *val {r3}) - Set r13 (small data pointer under Linux) |
| 68 |
*/ |
| 69 |
|
| 70 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(set_r13) |
| 71 |
C_SYMBOL_NAME(set_r13): |
| 72 |
mr r13,r3 |
| 73 |
blr |
| 74 |
|
| 75 |
|
| 76 |
/* |
| 77 |
* void flush_icache_range(void *start {r3}, void *end {r3}) - Flush D and I cache |
| 78 |
*/ |
| 79 |
|
| 80 |
CACHE_LINE_SIZE = 32 |
| 81 |
LG_CACHE_LINE_SIZE = 5 |
| 82 |
|
| 83 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(flush_icache_range) |
| 84 |
C_SYMBOL_NAME(flush_icache_range): |
| 85 |
li r5,CACHE_LINE_SIZE-1 |
| 86 |
andc r3,r3,r5 |
| 87 |
subf r4,r3,r4 |
| 88 |
add r4,r4,r5 |
| 89 |
srwi. r4,r4,LG_CACHE_LINE_SIZE |
| 90 |
beqlr |
| 91 |
mtctr r4 |
| 92 |
mr r6,r3 |
| 93 |
1: dcbst 0,r3 |
| 94 |
addi r3,r3,CACHE_LINE_SIZE |
| 95 |
bdnz 1b |
| 96 |
sync /* wait for dcbst's to get to ram */ |
| 97 |
mtctr r4 |
| 98 |
2: icbi 0,r6 |
| 99 |
addi r6,r6,CACHE_LINE_SIZE |
| 100 |
bdnz 2b |
| 101 |
sync |
| 102 |
isync |
| 103 |
blr |
| 104 |
|
| 105 |
|
| 106 |
/* |
| 107 |
* long atomic_add(long *var{r3}, long add{r4}) - Atomic add operation |
| 108 |
* long atomic_and(long *var{r3}, long and{r4}) - Atomic and operation |
| 109 |
* long atomic_or(long *var{r3}, long or{r4}) - Atomic or operation |
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* int test_and_set(int *var{r3}, int val{r4}) - Atomic test-and-set |
| 111 |
*/ |
| 112 |
|
| 113 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(atomic_add) |
| 114 |
C_SYMBOL_NAME(atomic_add): |
| 115 |
0: dcbf 0,r3 |
| 116 |
sync |
| 117 |
ori r0,r0,1 |
| 118 |
ori r0,r0,1 |
| 119 |
ori r0,r0,1 |
| 120 |
ori r0,r0,1 |
| 121 |
ori r0,r0,1 |
| 122 |
ori r0,r0,1 |
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isync |
| 124 |
lwarx r5,0,r3 |
| 125 |
add r0,r4,r5 |
| 126 |
stwcx. r0,0,r3 |
| 127 |
bne- 0b |
| 128 |
mr r3,r5 |
| 129 |
isync |
| 130 |
blr |
| 131 |
|
| 132 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(atomic_and) |
| 133 |
C_SYMBOL_NAME(atomic_and): |
| 134 |
0: dcbf 0,r3 |
| 135 |
sync |
| 136 |
ori r0,r0,1 |
| 137 |
ori r0,r0,1 |
| 138 |
ori r0,r0,1 |
| 139 |
ori r0,r0,1 |
| 140 |
ori r0,r0,1 |
| 141 |
ori r0,r0,1 |
| 142 |
isync |
| 143 |
lwarx r5,0,r3 |
| 144 |
and r0,r4,r5 |
| 145 |
stwcx. r0,0,r3 |
| 146 |
bne- 0b |
| 147 |
mr r3,r5 |
| 148 |
isync |
| 149 |
blr |
| 150 |
|
| 151 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(atomic_or) |
| 152 |
C_SYMBOL_NAME(atomic_or): |
| 153 |
0: dcbf 0,r3 |
| 154 |
sync |
| 155 |
ori r0,r0,1 |
| 156 |
ori r0,r0,1 |
| 157 |
ori r0,r0,1 |
| 158 |
ori r0,r0,1 |
| 159 |
ori r0,r0,1 |
| 160 |
ori r0,r0,1 |
| 161 |
isync |
| 162 |
lwarx r5,0,r3 |
| 163 |
or r0,r4,r5 |
| 164 |
stwcx. r0,0,r3 |
| 165 |
bne- 0b |
| 166 |
mr r3,r5 |
| 167 |
isync |
| 168 |
blr |
| 169 |
|
| 170 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(test_and_set) |
| 171 |
C_SYMBOL_NAME(test_and_set): |
| 172 |
0: dcbf 0,r3 |
| 173 |
sync |
| 174 |
ori r0,r0,1 |
| 175 |
ori r0,r0,1 |
| 176 |
ori r0,r0,1 |
| 177 |
ori r0,r0,1 |
| 178 |
ori r0,r0,1 |
| 179 |
ori r0,r0,1 |
| 180 |
isync |
| 181 |
lwarx r5,0,r3 |
| 182 |
cmpi 0,r5,0x0000 |
| 183 |
bne 1f |
| 184 |
stwcx. r4,0,r3 |
| 185 |
bne- 0b |
| 186 |
1: isync |
| 187 |
mr r3,r5 |
| 188 |
blr |
| 189 |
|
| 190 |
|
| 191 |
/* |
| 192 |
* void quit_emulator(void) - Jump to XLM_EMUL_RETURN_PROC |
| 193 |
*/ |
| 194 |
|
| 195 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(quit_emulator) |
| 196 |
C_SYMBOL_NAME(quit_emulator): |
| 197 |
lwz r0,XLM_EMUL_RETURN_PROC(0) |
| 198 |
mtlr r0 |
| 199 |
blr |
| 200 |
|
| 201 |
|
| 202 |
/* |
| 203 |
* void jump_to_rom(uint32 entry {r3}, uint32 emulator_data {r4}) - Jump to Mac ROM |
| 204 |
*/ |
| 205 |
|
| 206 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(jump_to_rom) |
| 207 |
C_SYMBOL_NAME(jump_to_rom): |
| 208 |
// Create stack frame |
| 209 |
mflr r0 |
| 210 |
stw r0,4(r1) |
| 211 |
stwu r1,-(20+19*4+18*8)(r1) // maintain 16 byte alignment |
| 212 |
|
| 213 |
// Save PowerPC registers |
| 214 |
stmw r13,20(r1) |
| 215 |
stfd f14,20+19*4+0*8(r1) |
| 216 |
stfd f15,20+19*4+1*8(r1) |
| 217 |
stfd f16,20+19*4+2*8(r1) |
| 218 |
stfd f17,20+19*4+3*8(r1) |
| 219 |
stfd f18,20+19*4+4*8(r1) |
| 220 |
stfd f19,20+19*4+5*8(r1) |
| 221 |
stfd f20,20+19*4+6*8(r1) |
| 222 |
stfd f21,20+19*4+7*8(r1) |
| 223 |
stfd f22,20+19*4+8*8(r1) |
| 224 |
stfd f23,20+19*4+9*8(r1) |
| 225 |
stfd f24,20+19*4+10*8(r1) |
| 226 |
stfd f25,20+19*4+11*8(r1) |
| 227 |
stfd f26,20+19*4+12*8(r1) |
| 228 |
stfd f27,20+19*4+13*8(r1) |
| 229 |
stfd f28,20+19*4+14*8(r1) |
| 230 |
stfd f29,20+19*4+15*8(r1) |
| 231 |
stfd f30,20+19*4+16*8(r1) |
| 232 |
stfd f31,20+19*4+17*8(r1) |
| 233 |
|
| 234 |
// Move entry address to ctr |
| 235 |
mtctr r3 |
| 236 |
|
| 237 |
// Skip over EMUL_RETURN routine and get its address |
| 238 |
bl 1f |
| 239 |
|
| 240 |
|
| 241 |
/* |
| 242 |
* EMUL_RETURN: Returned from emulator |
| 243 |
*/ |
| 244 |
|
| 245 |
// Restore PowerPC registers |
| 246 |
lwz r1,XLM_EMUL_RETURN_STACK(0) |
| 247 |
RESTORE_SYSTEM_R2 |
| 248 |
lmw r13,20(r1) |
| 249 |
lfd f14,20+19*4+0*8(r1) |
| 250 |
lfd f15,20+19*4+1*8(r1) |
| 251 |
lfd f16,20+19*4+2*8(r1) |
| 252 |
lfd f17,20+19*4+3*8(r1) |
| 253 |
lfd f18,20+19*4+4*8(r1) |
| 254 |
lfd f19,20+19*4+5*8(r1) |
| 255 |
lfd f20,20+19*4+6*8(r1) |
| 256 |
lfd f21,20+19*4+7*8(r1) |
| 257 |
lfd f22,20+19*4+8*8(r1) |
| 258 |
lfd f23,20+19*4+9*8(r1) |
| 259 |
lfd f24,20+19*4+10*8(r1) |
| 260 |
lfd f25,20+19*4+11*8(r1) |
| 261 |
lfd f26,20+19*4+12*8(r1) |
| 262 |
lfd f27,20+19*4+13*8(r1) |
| 263 |
lfd f28,20+19*4+14*8(r1) |
| 264 |
lfd f29,20+19*4+15*8(r1) |
| 265 |
lfd f30,20+19*4+16*8(r1) |
| 266 |
lfd f31,20+19*4+17*8(r1) |
| 267 |
|
| 268 |
// Exiting from 68k emulator |
| 269 |
li r0,1 |
| 270 |
stw r0,XLM_IRQ_NEST(0) |
| 271 |
li r0,MODE_NATIVE |
| 272 |
stw r0,XLM_RUN_MODE(0) |
| 273 |
|
| 274 |
// Return to caller of jump_to_rom() |
| 275 |
lwz r0,20+19*4+18*8+4(r1) |
| 276 |
mtlr r0 |
| 277 |
addi r1,r1,20+19*4+18*8 |
| 278 |
blr |
| 279 |
|
| 280 |
|
| 281 |
// Save address of EMUL_RETURN routine for 68k emulator patch |
| 282 |
1: mflr r0 |
| 283 |
stw r0,XLM_EMUL_RETURN_PROC(0) |
| 284 |
|
| 285 |
// Skip over EXEC_RETURN routine and get its address |
| 286 |
bl 2f |
| 287 |
|
| 288 |
|
| 289 |
/* |
| 290 |
* EXEC_RETURN: Returned from 68k routine executed with Execute68k() |
| 291 |
*/ |
| 292 |
|
| 293 |
// Save r25 (contains current 68k interrupt level) |
| 294 |
stw r25,XLM_68K_R25(0) |
| 295 |
|
| 296 |
// Reentering EMUL_OP mode |
| 297 |
li r0,MODE_EMUL_OP |
| 298 |
stw r0,XLM_RUN_MODE(0) |
| 299 |
|
| 300 |
// Save 68k registers |
| 301 |
lwz r4,48(r1) // Pointer to M68kRegisters |
| 302 |
stw r8,0*4(r4) // d[0]...d[7] |
| 303 |
stw r9,1*4(r4) |
| 304 |
stw r10,2*4(r4) |
| 305 |
stw r11,3*4(r4) |
| 306 |
stw r12,4*4(r4) |
| 307 |
stw r13,5*4(r4) |
| 308 |
stw r14,6*4(r4) |
| 309 |
stw r15,7*4(r4) |
| 310 |
stw r16,8*4(r4) // a[0]..a[6] |
| 311 |
stw r17,9*4(r4) |
| 312 |
stw r18,10*4(r4) |
| 313 |
stw r19,11*4(r4) |
| 314 |
stw r20,12*4(r4) |
| 315 |
stw r21,13*4(r4) |
| 316 |
stw r22,14*4(r4) |
| 317 |
|
| 318 |
// Restore PowerPC registers |
| 319 |
lmw r13,56(r1) |
| 320 |
#if SAVE_FP_EXEC_68K |
| 321 |
lfd f14,56+19*4+0*8(r1) |
| 322 |
lfd f15,56+19*4+1*8(r1) |
| 323 |
lfd f16,56+19*4+2*8(r1) |
| 324 |
lfd f17,56+19*4+3*8(r1) |
| 325 |
lfd f18,56+19*4+4*8(r1) |
| 326 |
lfd f19,56+19*4+5*8(r1) |
| 327 |
lfd f20,56+19*4+6*8(r1) |
| 328 |
lfd f21,56+19*4+7*8(r1) |
| 329 |
lfd f22,56+19*4+8*8(r1) |
| 330 |
lfd f23,56+19*4+9*8(r1) |
| 331 |
lfd f24,56+19*4+10*8(r1) |
| 332 |
lfd f25,56+19*4+11*8(r1) |
| 333 |
lfd f26,56+19*4+12*8(r1) |
| 334 |
lfd f27,56+19*4+13*8(r1) |
| 335 |
lfd f28,56+19*4+14*8(r1) |
| 336 |
lfd f29,56+19*4+15*8(r1) |
| 337 |
lfd f30,56+19*4+16*8(r1) |
| 338 |
lfd f31,56+19*4+17*8(r1) |
| 339 |
#endif |
| 340 |
|
| 341 |
// Return to caller |
| 342 |
lwz r0,52(r1) |
| 343 |
mtcrf 0xff,r0 |
| 344 |
lwz r0,56+19*4+18*8+4(r1) |
| 345 |
mtlr r0 |
| 346 |
addi r1,r1,56+19*4+18*8 |
| 347 |
RESTORE_SYSTEM_R2 |
| 348 |
RESTORE_SYSTEM_R13 |
| 349 |
blr |
| 350 |
|
| 351 |
|
| 352 |
// Save address of EXEC_RETURN routine for 68k emulator patch |
| 353 |
2: mflr r0 |
| 354 |
stw r0,XLM_EXEC_RETURN_PROC(0) |
| 355 |
|
| 356 |
// Skip over EMUL_BREAK/EMUL_OP routine and get its address |
| 357 |
bl 3f |
| 358 |
|
| 359 |
|
| 360 |
/* |
| 361 |
* EMUL_BREAK/EMUL_OP: Execute native routine, selector in r5 (my own private mode switch) |
| 362 |
* |
| 363 |
* 68k registers are stored in a M68kRegisters struct on the stack |
| 364 |
* which the native routine may read and modify |
| 365 |
*/ |
| 366 |
|
| 367 |
// Save r25 (contains current 68k interrupt level) |
| 368 |
stw r25,XLM_68K_R25(0) |
| 369 |
|
| 370 |
// Entering EMUL_OP mode within 68k emulator |
| 371 |
li r0,MODE_EMUL_OP |
| 372 |
stw r0,XLM_RUN_MODE(0) |
| 373 |
|
| 374 |
// Create PowerPC stack frame, reserve space for M68kRegisters |
| 375 |
mr r3,r1 |
| 376 |
subi r1,r1,64 // Fake "caller" frame |
| 377 |
rlwinm r1,r1,0,0,27 // Align stack |
| 378 |
|
| 379 |
mfcr r0 |
| 380 |
rlwinm r0,r0,0,11,8 |
| 381 |
stw r0,4(r1) |
| 382 |
mfxer r0 |
| 383 |
stw r0,16(r1) |
| 384 |
stw r2,12(r1) |
| 385 |
stwu r1,-(56+16*4+15*8)(r1) |
| 386 |
|
| 387 |
// Save 68k registers (M68kRegisters) |
| 388 |
stw r8,56+0*4(r1) // d[0]..d[7] |
| 389 |
stw r9,56+1*4(r1) |
| 390 |
stw r10,56+2*4(r1) |
| 391 |
stw r11,56+3*4(r1) |
| 392 |
stw r12,56+4*4(r1) |
| 393 |
stw r13,56+5*4(r1) |
| 394 |
stw r14,56+6*4(r1) |
| 395 |
stw r15,56+7*4(r1) |
| 396 |
stw r16,56+8*4(r1) // a[0]..a[7] |
| 397 |
stw r17,56+9*4(r1) |
| 398 |
stw r18,56+10*4(r1) |
| 399 |
stw r19,56+11*4(r1) |
| 400 |
stw r20,56+12*4(r1) |
| 401 |
stw r21,56+13*4(r1) |
| 402 |
stw r22,56+14*4(r1) |
| 403 |
stw r3,56+15*4(r1) |
| 404 |
stfd f0,56+16*4+0*8(r1) |
| 405 |
stfd f1,56+16*4+1*8(r1) |
| 406 |
stfd f2,56+16*4+2*8(r1) |
| 407 |
stfd f3,56+16*4+3*8(r1) |
| 408 |
stfd f4,56+16*4+4*8(r1) |
| 409 |
stfd f5,56+16*4+5*8(r1) |
| 410 |
stfd f6,56+16*4+6*8(r1) |
| 411 |
stfd f7,56+16*4+7*8(r1) |
| 412 |
mffs f0 |
| 413 |
stfd f8,56+16*4+8*8(r1) |
| 414 |
stfd f9,56+16*4+9*8(r1) |
| 415 |
stfd f10,56+16*4+10*8(r1) |
| 416 |
stfd f11,56+16*4+11*8(r1) |
| 417 |
stfd f12,56+16*4+12*8(r1) |
| 418 |
stfd f13,56+16*4+13*8(r1) |
| 419 |
stfd f0,56+16*4+14*8(r1) |
| 420 |
|
| 421 |
// Execute native routine |
| 422 |
RESTORE_SYSTEM_R2 |
| 423 |
RESTORE_SYSTEM_R13 |
| 424 |
addi r3,r1,56 |
| 425 |
mr r4,r24 |
| 426 |
bl C_SYMBOL_NAME(EmulOp) |
| 427 |
|
| 428 |
// Restore 68k registers (M68kRegisters) |
| 429 |
lwz r8,56+0*4(r1) // d[0]..d[7] |
| 430 |
lwz r9,56+1*4(r1) |
| 431 |
lwz r10,56+2*4(r1) |
| 432 |
lwz r11,56+3*4(r1) |
| 433 |
lwz r12,56+4*4(r1) |
| 434 |
lwz r13,56+5*4(r1) |
| 435 |
lwz r14,56+6*4(r1) |
| 436 |
lwz r15,56+7*4(r1) |
| 437 |
lwz r16,56+8*4(r1) // a[0]..a[7] |
| 438 |
lwz r17,56+9*4(r1) |
| 439 |
lwz r18,56+10*4(r1) |
| 440 |
lwz r19,56+11*4(r1) |
| 441 |
lwz r20,56+12*4(r1) |
| 442 |
lwz r21,56+13*4(r1) |
| 443 |
lwz r22,56+14*4(r1) |
| 444 |
lwz r3,56+15*4(r1) |
| 445 |
lfd f13,56+16*4+14*8(r1) |
| 446 |
lfd f0,56+16*4+0*8(r1) |
| 447 |
lfd f1,56+16*4+1*8(r1) |
| 448 |
lfd f2,56+16*4+2*8(r1) |
| 449 |
lfd f3,56+16*4+3*8(r1) |
| 450 |
lfd f4,56+16*4+4*8(r1) |
| 451 |
lfd f5,56+16*4+5*8(r1) |
| 452 |
lfd f6,56+16*4+6*8(r1) |
| 453 |
lfd f7,56+16*4+7*8(r1) |
| 454 |
mtfsf 0xff,f13 |
| 455 |
lfd f8,56+16*4+8*8(r1) |
| 456 |
lfd f9,56+16*4+9*8(r1) |
| 457 |
lfd f10,56+16*4+10*8(r1) |
| 458 |
lfd f11,56+16*4+11*8(r1) |
| 459 |
lfd f12,56+16*4+12*8(r1) |
| 460 |
lfd f13,56+16*4+13*8(r1) |
| 461 |
|
| 462 |
// Delete PowerPC stack frame |
| 463 |
lwz r2,56+16*4+15*8+12(r1) |
| 464 |
lwz r0,56+16*4+15*8+16(r1) |
| 465 |
mtxer r0 |
| 466 |
lwz r0,56+16*4+15*8+4(r1) |
| 467 |
mtcrf 0xff,r0 |
| 468 |
mr r1,r3 |
| 469 |
|
| 470 |
// Reentering 68k emulator |
| 471 |
li r0,MODE_68K |
| 472 |
stw r0,XLM_RUN_MODE(0) |
| 473 |
|
| 474 |
// Set r0 to 0 for 68k emulator |
| 475 |
li r0,0 |
| 476 |
|
| 477 |
// Execute next 68k opcode |
| 478 |
rlwimi r29,r27,3,13,28 |
| 479 |
lhau r27,2(r24) |
| 480 |
mtlr r29 |
| 481 |
blr |
| 482 |
|
| 483 |
|
| 484 |
// Save address of EMUL_BREAK/EMUL_OP routine for 68k emulator patch |
| 485 |
3: mflr r0 |
| 486 |
stw r0,XLM_EMUL_OP_PROC(0) |
| 487 |
|
| 488 |
// Save stack pointer for EMUL_RETURN |
| 489 |
stw r1,XLM_EMUL_RETURN_STACK(0) |
| 490 |
|
| 491 |
// Preset registers for ROM boot routine |
| 492 |
lis r3,0x40b0 // Pointer to ROM boot structure |
| 493 |
ori r3,r3,0xd000 |
| 494 |
|
| 495 |
// 68k emulator is now active |
| 496 |
li r0,MODE_68K |
| 497 |
stw r0,XLM_RUN_MODE(0) |
| 498 |
|
| 499 |
// Jump to ROM |
| 500 |
bctr |
| 501 |
|
| 502 |
|
| 503 |
/* |
| 504 |
* void execute_68k(uint32 pc {r3}, M68kRegisters *r {r4}) - Execute 68k routine |
| 505 |
*/ |
| 506 |
|
| 507 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(execute_68k) |
| 508 |
C_SYMBOL_NAME(execute_68k): |
| 509 |
// Create MacOS stack frame |
| 510 |
mflr r0 |
| 511 |
stw r0,4(r1) |
| 512 |
stwu r1,-(56+19*4+18*8)(r1) |
| 513 |
mfcr r0 |
| 514 |
stw r4,48(r1) // save pointer to M68kRegisters for EXEC_RETURN |
| 515 |
stw r0,52(r1) // save CR |
| 516 |
|
| 517 |
// Save PowerPC registers |
| 518 |
stmw r13,56(r1) |
| 519 |
#if SAVE_FP_EXEC_68K |
| 520 |
stfd f14,56+19*4+0*8(r1) |
| 521 |
stfd f15,56+19*4+1*8(r1) |
| 522 |
stfd f16,56+19*4+2*8(r1) |
| 523 |
stfd f17,56+19*4+3*8(r1) |
| 524 |
stfd f18,56+19*4+4*8(r1) |
| 525 |
stfd f19,56+19*4+5*8(r1) |
| 526 |
stfd f20,56+19*4+6*8(r1) |
| 527 |
stfd f21,56+19*4+7*8(r1) |
| 528 |
stfd f22,56+19*4+8*8(r1) |
| 529 |
stfd f23,56+19*4+9*8(r1) |
| 530 |
stfd f24,56+19*4+10*8(r1) |
| 531 |
stfd f25,56+19*4+11*8(r1) |
| 532 |
stfd f26,56+19*4+12*8(r1) |
| 533 |
stfd f27,56+19*4+13*8(r1) |
| 534 |
stfd f28,56+19*4+14*8(r1) |
| 535 |
stfd f29,56+19*4+15*8(r1) |
| 536 |
stfd f30,56+19*4+16*8(r1) |
| 537 |
stfd f31,56+19*4+17*8(r1) |
| 538 |
#endif |
| 539 |
|
| 540 |
// Set up registers for 68k emulator |
| 541 |
lwz r31,XLM_KERNEL_DATA(0) // Pointer to Kernel Data |
| 542 |
addi r31,r31,0x1000 |
| 543 |
li r0,0 |
| 544 |
mtcrf 0xff,r0 |
| 545 |
creqv 11,11,11 // Supervisor mode |
| 546 |
lwz r8,0*4(r4) // d[0]..d[7] |
| 547 |
lwz r9,1*4(r4) |
| 548 |
lwz r10,2*4(r4) |
| 549 |
lwz r11,3*4(r4) |
| 550 |
lwz r12,4*4(r4) |
| 551 |
lwz r13,5*4(r4) |
| 552 |
lwz r14,6*4(r4) |
| 553 |
lwz r15,7*4(r4) |
| 554 |
lwz r16,8*4(r4) // a[0]..a[6] |
| 555 |
lwz r17,9*4(r4) |
| 556 |
lwz r18,10*4(r4) |
| 557 |
lwz r19,11*4(r4) |
| 558 |
lwz r20,12*4(r4) |
| 559 |
lwz r21,13*4(r4) |
| 560 |
lwz r22,14*4(r4) |
| 561 |
li r23,0 |
| 562 |
mr r24,r3 |
| 563 |
lwz r25,XLM_68K_R25(0) // MSB of SR |
| 564 |
li r26,0 |
| 565 |
li r28,0 // VBR |
| 566 |
lwz r29,0x74(r31) // Pointer to opcode table |
| 567 |
lwz r30,0x78(r31) // Address of emulator |
| 568 |
|
| 569 |
// Push return address (points to EXEC_RETURN opcode) on stack |
| 570 |
li r0,XLM_EXEC_RETURN_OPCODE |
| 571 |
stwu r0,-4(r1) |
| 572 |
|
| 573 |
// Reentering 68k emulator |
| 574 |
li r0,MODE_68K |
| 575 |
stw r0,XLM_RUN_MODE(0) |
| 576 |
|
| 577 |
// Set r0 to 0 for 68k emulator |
| 578 |
li r0,0 |
| 579 |
|
| 580 |
// Execute 68k opcode |
| 581 |
lha r27,0(r24) |
| 582 |
rlwimi r29,r27,3,13,28 |
| 583 |
lhau r27,2(r24) |
| 584 |
mtlr r29 |
| 585 |
blr |
| 586 |
|
| 587 |
|
| 588 |
/* |
| 589 |
* uint32 call_macos1(uint32 tvect{r3}, uint32 arg1{r4}) ... - Call MacOS routines |
| 590 |
*/ |
| 591 |
|
| 592 |
ASM_MACRO_START prolog |
| 593 |
mflr r0 |
| 594 |
stw r0,4(r1) |
| 595 |
stwu r1,-64(r1) |
| 596 |
ASM_MACRO_END |
| 597 |
|
| 598 |
ASM_MACRO_START epilog |
| 599 |
lwz r0,64+4(r1) |
| 600 |
mtlr r0 |
| 601 |
addi r1,r1,64 |
| 602 |
RESTORE_SYSTEM_R2 |
| 603 |
RESTORE_SYSTEM_R13 |
| 604 |
blr |
| 605 |
ASM_MACRO_END |
| 606 |
|
| 607 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos) |
| 608 |
C_SYMBOL_NAME(call_macos): |
| 609 |
prolog |
| 610 |
lwz r0,0(r3) // Get routine address |
| 611 |
lwz r2,4(r3) // Load TOC pointer |
| 612 |
mtctr r0 |
| 613 |
bctrl |
| 614 |
epilog |
| 615 |
|
| 616 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos1) |
| 617 |
C_SYMBOL_NAME(call_macos1): |
| 618 |
prolog |
| 619 |
lwz r0,0(r3) // Get routine address |
| 620 |
lwz r2,4(r3) // Load TOC pointer |
| 621 |
mtctr r0 |
| 622 |
mr r3,r4 |
| 623 |
bctrl |
| 624 |
epilog |
| 625 |
|
| 626 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos2) |
| 627 |
C_SYMBOL_NAME(call_macos2): |
| 628 |
prolog |
| 629 |
lwz r0,0(r3) // Get routine address |
| 630 |
lwz r2,4(r3) // Load TOC pointer |
| 631 |
mtctr r0 |
| 632 |
mr r3,r4 |
| 633 |
mr r4,r5 |
| 634 |
bctrl |
| 635 |
epilog |
| 636 |
|
| 637 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos3) |
| 638 |
C_SYMBOL_NAME(call_macos3): |
| 639 |
prolog |
| 640 |
lwz r0,0(r3) // Get routine address |
| 641 |
lwz r2,4(r3) // Load TOC pointer |
| 642 |
mtctr r0 |
| 643 |
mr r3,r4 |
| 644 |
mr r4,r5 |
| 645 |
mr r5,r6 |
| 646 |
bctrl |
| 647 |
epilog |
| 648 |
|
| 649 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos4) |
| 650 |
C_SYMBOL_NAME(call_macos4): |
| 651 |
prolog |
| 652 |
lwz r0,0(r3) // Get routine address |
| 653 |
lwz r2,4(r3) // Load TOC pointer |
| 654 |
mtctr r0 |
| 655 |
mr r3,r4 |
| 656 |
mr r4,r5 |
| 657 |
mr r5,r6 |
| 658 |
mr r6,r7 |
| 659 |
bctrl |
| 660 |
epilog |
| 661 |
|
| 662 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos5) |
| 663 |
C_SYMBOL_NAME(call_macos5): |
| 664 |
prolog |
| 665 |
lwz r0,0(r3) // Get routine address |
| 666 |
lwz r2,4(r3) // Load TOC pointer |
| 667 |
mtctr r0 |
| 668 |
mr r3,r4 |
| 669 |
mr r4,r5 |
| 670 |
mr r5,r6 |
| 671 |
mr r6,r7 |
| 672 |
mr r7,r8 |
| 673 |
bctrl |
| 674 |
epilog |
| 675 |
|
| 676 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos6) |
| 677 |
C_SYMBOL_NAME(call_macos6): |
| 678 |
prolog |
| 679 |
lwz r0,0(r3) // Get routine address |
| 680 |
lwz r2,4(r3) // Load TOC pointer |
| 681 |
mtctr r0 |
| 682 |
mr r3,r4 |
| 683 |
mr r4,r5 |
| 684 |
mr r5,r6 |
| 685 |
mr r6,r7 |
| 686 |
mr r7,r8 |
| 687 |
mr r8,r9 |
| 688 |
bctrl |
| 689 |
epilog |
| 690 |
|
| 691 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(call_macos7) |
| 692 |
C_SYMBOL_NAME(call_macos7): |
| 693 |
prolog |
| 694 |
lwz r0,0(r3) // Get routine address |
| 695 |
lwz r2,4(r3) // Load TOC pointer |
| 696 |
mtctr r0 |
| 697 |
mr r3,r4 |
| 698 |
mr r4,r5 |
| 699 |
mr r5,r6 |
| 700 |
mr r6,r7 |
| 701 |
mr r7,r8 |
| 702 |
mr r8,r9 |
| 703 |
mr r9,r10 |
| 704 |
bctrl |
| 705 |
epilog |
| 706 |
|
| 707 |
|
| 708 |
/* |
| 709 |
* Native resource manager patches |
| 710 |
*/ |
| 711 |
|
| 712 |
ASM_MACRO_START do_get_resource ASM_MACRO_ARG0_DEF |
| 713 |
// Create stack frame |
| 714 |
mflr r0 |
| 715 |
stw r0,8(r1) |
| 716 |
stwu r1,-(56+12)(r1) |
| 717 |
|
| 718 |
// Save type/ID |
| 719 |
stw r3,56(r1) |
| 720 |
stw r4,56+4(r1) |
| 721 |
|
| 722 |
// Call old routine |
| 723 |
lwz r0,ASM_MACRO_ARG0(0) |
| 724 |
lwz r2,XLM_RES_LIB_TOC(0) |
| 725 |
mtctr r0 |
| 726 |
bctrl |
| 727 |
stw r3,56+8(r1) // Save handle |
| 728 |
|
| 729 |
// Call CheckLoad |
| 730 |
RESTORE_SYSTEM_R2 |
| 731 |
RESTORE_SYSTEM_R13 |
| 732 |
lwz r3,56(r1) |
| 733 |
lha r4,56+6(r1) |
| 734 |
lwz r5,56+8(r1) |
| 735 |
bl C_SYMBOL_NAME(check_load_invoc) |
| 736 |
lwz r3,56+8(r1) // Restore handle |
| 737 |
|
| 738 |
// Return to caller |
| 739 |
lwz r0,56+12+8(r1) |
| 740 |
mtlr r0 |
| 741 |
addi r1,r1,56+12 |
| 742 |
blr |
| 743 |
ASM_MACRO_END |
| 744 |
|
| 745 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_resource) |
| 746 |
C_SYMBOL_NAME(get_resource): |
| 747 |
do_get_resource XLM_GET_RESOURCE |
| 748 |
|
| 749 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_1_resource) |
| 750 |
C_SYMBOL_NAME(get_1_resource): |
| 751 |
do_get_resource XLM_GET_1_RESOURCE |
| 752 |
|
| 753 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_ind_resource) |
| 754 |
C_SYMBOL_NAME(get_ind_resource): |
| 755 |
do_get_resource XLM_GET_IND_RESOURCE |
| 756 |
|
| 757 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(get_1_ind_resource) |
| 758 |
C_SYMBOL_NAME(get_1_ind_resource): |
| 759 |
do_get_resource XLM_GET_1_IND_RESOURCE |
| 760 |
|
| 761 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(r_get_resource) |
| 762 |
C_SYMBOL_NAME(r_get_resource): |
| 763 |
do_get_resource XLM_R_GET_RESOURCE |
| 764 |
|
| 765 |
|
| 766 |
/* |
| 767 |
* void ppc_interrupt(uint32 entry{r3}, uint32 kernel_data{r4}) - Execute PPC interrupt |
| 768 |
*/ |
| 769 |
|
| 770 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(ppc_interrupt) |
| 771 |
C_SYMBOL_NAME(ppc_interrupt): |
| 772 |
mflr r0 |
| 773 |
stw r0,4(r1) |
| 774 |
stwu r1,-64(r1) |
| 775 |
|
| 776 |
// Get address of return routine |
| 777 |
bl 1f |
| 778 |
|
| 779 |
// Return routine |
| 780 |
lwz r0,64+4(r1) |
| 781 |
mtlr r0 |
| 782 |
addi r1,r1,64 |
| 783 |
blr |
| 784 |
|
| 785 |
// Prepare registers for nanokernel interrupt routine |
| 786 |
1: mtctr r1 |
| 787 |
mr r1,r4 |
| 788 |
stw r6,0x018(r1) |
| 789 |
mfctr r6 |
| 790 |
stw r6,0x004(r1) |
| 791 |
lwz r6,0x65c(r1) |
| 792 |
stw r7,0x13c(r6) |
| 793 |
stw r8,0x144(r6) |
| 794 |
stw r9,0x14c(r6) |
| 795 |
stw r10,0x154(r6) |
| 796 |
stw r11,0x15c(r6) |
| 797 |
stw r12,0x164(r6) |
| 798 |
stw r13,0x16c(r6) |
| 799 |
|
| 800 |
mflr r10 |
| 801 |
mfcr r13 |
| 802 |
lwz r7,0x660(r1) |
| 803 |
mflr r12 |
| 804 |
rlwimi. r7,r7,8,0,0 |
| 805 |
li r11,0 |
| 806 |
ori r11,r11,0xf072 // MSR (SRR1) |
| 807 |
mtcrf 0x70,r11 |
| 808 |
li r8,0 |
| 809 |
|
| 810 |
// Enter nanokernel |
| 811 |
mtlr r3 |
| 812 |
blr |
| 813 |
|
| 814 |
|
| 815 |
/* |
| 816 |
* Define signal handlers with alternate stack initialization magic |
| 817 |
*/ |
| 818 |
|
| 819 |
#define SIG_STACK_SIZE 0x10000 |
| 820 |
|
| 821 |
ASM_MACRO_START do_define_signal_handler \ |
| 822 |
ASM_MACRO_ARG0_DEF /* name */ \ |
| 823 |
ASM_MACRO_ARG1_DEF /* stack */ \ |
| 824 |
ASM_MACRO_ARG2_DEF /* stack id */ \ |
| 825 |
ASM_MACRO_ARG3_DEF /* signal handler */ |
| 826 |
|
| 827 |
// Alternate stack lower base for this signal handler |
| 828 |
.lcomm ASM_MACRO_ARG1,SIG_STACK_SIZE,ASM_ALIGN_2(4) |
| 829 |
ASM_TYPE(ASM_MACRO_ARG1,@object) |
| 830 |
|
| 831 |
// Represents the current nest level for this signal handler |
| 832 |
// Note that in SheepShaver, SIGUSR2 signals are blocked while |
| 833 |
// handling other signals so, it's unlikely we ever get a nest |
| 834 |
// level greater than 1 |
| 835 |
.lcomm ASM_MACRO_ARG2,4,ASM_ALIGN_2(2) |
| 836 |
ASM_TYPE(ASM_MACRO_ARG2,@object) |
| 837 |
|
| 838 |
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(ASM_MACRO_ARG0) |
| 839 |
C_SYMBOL_NAME(ASM_MACRO_ARG0): |
| 840 |
// Preserve args in scratch registers |
| 841 |
mflr r14 |
| 842 |
mr r15,r3 |
| 843 |
mr r16,r4 |
| 844 |
mr r17,r5 |
| 845 |
mr r18,r1 |
| 846 |
|
| 847 |
// Atomically increase stack_id |
| 848 |
lis r19,ASM_HA16(ASM_MACRO_ARG2) |
| 849 |
la r19,ASM_LO16(ASM_MACRO_ARG2,r19) |
| 850 |
li r4,1 |
| 851 |
mr r3,r19 |
| 852 |
bl C_SYMBOL_NAME(atomic_add) |
| 853 |
cmpwi r3,0 |
| 854 |
bne- 1f |
| 855 |
|
| 856 |
// ID was 0, we can use the local stack |
| 857 |
lis r9,ASM_HA16(ASM_MACRO_ARG1) |
| 858 |
lis r3,(SIG_STACK_SIZE>>16) |
| 859 |
la r9,ASM_LO16(ASM_MACRO_ARG1,r9) |
| 860 |
addi r3,r3,((SIG_STACK_SIZE&0xffff)-64) |
| 861 |
add r1,r9,r3 |
| 862 |
|
| 863 |
1: // Invoke signal handler |
| 864 |
stwu r1,-16(r1) |
| 865 |
mr r3,r15 |
| 866 |
mr r4,r16 |
| 867 |
mr r5,r17 |
| 868 |
bl C_SYMBOL_NAME(ASM_MACRO_ARG3) |
| 869 |
addi r1,r1,16 |
| 870 |
|
| 871 |
// Atomically decrease stack id |
| 872 |
mr r3,r19 |
| 873 |
li r4,-1 |
| 874 |
bl C_SYMBOL_NAME(atomic_add) |
| 875 |
|
| 876 |
// Restore kernel stack and return |
| 877 |
mtlr r14 |
| 878 |
mr r1,r18 |
| 879 |
blr |
| 880 |
ASM_MACRO_END |
| 881 |
|
| 882 |
#define DEFINE_SIGNAL_HANDLER(NAME) \ |
| 883 |
do_define_signal_handler \ |
| 884 |
NAME##_handler_init ASM_MACRO_ARG_SEP \ |
| 885 |
NAME##_stack ASM_MACRO_ARG_SEP \ |
| 886 |
NAME##_stack_id ASM_MACRO_ARG_SEP \ |
| 887 |
NAME##_handler |
| 888 |
|
| 889 |
DEFINE_SIGNAL_HANDLER(sigusr2) |
