1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * System call trap handler. 28 */ 29 #include <sys/asm_linkage.h> 30 #include <sys/machpcb.h> 31 #include <sys/machthread.h> 32 #include <sys/syscall.h> 33 #include <sys/trap.h> 34 #include <sys/machtrap.h> 35 #include <sys/pcb.h> 36 #include <sys/machparam.h> 37 38 #if !defined(lint) && !defined(__lint) 39 #include "assym.h" 40 #endif 41 42 #ifdef TRAPTRACE 43 #include <sys/traptrace.h> 44 #endif /* TRAPTRACE */ 45 46 #if defined(lint) || defined(__lint) 47 48 /*ARGSUSED*/ 49 void 50 syscall_trap(struct regs *rp) /* for tags only; not called from C */ 51 {} 52 53 #else /* lint */ 54 55 #if (1 << SYSENT_SHIFT) != SYSENT_SIZE 56 #error "SYSENT_SHIFT does not correspond to size of sysent structure" 57 #endif 58 59 /* 60 * Native System call trap handler. 61 * 62 * We branch here from sys_trap when a 64-bit system call occurs. 63 * 64 * Entry: 65 * %o0 = regs 66 * 67 * Usage: 68 * %l0 = saved return address 69 * %l1 = saved regs 70 * %l2 = lwp 71 */ 72 ENTRY_NP(syscall_trap) 73 ldn [THREAD_REG + T_CPU], %g1 ! get cpu pointer 74 mov %o7, %l0 ! save return addr 75 ! 76 ! If the trapping thread has the address mask bit set, then it's 77 ! a 32-bit process, and has no business calling 64-bit syscalls. 78 ! 79 ldx [%o0 + TSTATE_OFF], %l1 ! saved %tstate.am is that 80 andcc %l1, TSTATE_AM, %l1 ! of the trapping proc 81 bne,pn %xcc, _syscall_ill ! 82 mov %o0, %l1 ! save reg pointer 83 mov %i0, %o0 ! copy 1st arg 84 mov %i1, %o1 ! copy 2nd arg 85 ldx [%g1 + CPU_STATS_SYS_SYSCALL], %g2 86 inc %g2 ! cpu_stats.sys.syscall++ 87 stx %g2, [%g1 + CPU_STATS_SYS_SYSCALL] 88 89 ! 90 ! Set new state for LWP 91 ! 92 ldn [THREAD_REG + T_LWP], %l2 93 mov LWP_SYS, %g3 94 mov %i2, %o2 ! copy 3rd arg 95 stb %g3, [%l2 + LWP_STATE] 96 mov %i3, %o3 ! copy 4th arg 97 ldx [%l2 + LWP_RU_SYSC], %g2 ! pesky statistics 98 mov %i4, %o4 ! copy 5th arg 99 addx %g2, 1, %g2 100 stx %g2, [%l2 + LWP_RU_SYSC] 101 mov %i5, %o5 ! copy 6th arg 102 ! args for direct syscalls now set up 103 104 #ifdef TRAPTRACE 105 ! 106 ! make trap trace entry - helps in debugging 107 ! 108 rdpr %pstate, %l3 109 andn %l3, PSTATE_IE | PSTATE_AM, %g3 110 wrpr %g0, %g3, %pstate ! disable interrupt 111 TRACE_PTR(%g3, %g2) ! get trace pointer 112 GET_TRACE_TICK(%g1, %g2) 113 stxa %g1, [%g3 + TRAP_ENT_TICK]%asi 114 ldx [%l1 + G1_OFF], %g1 ! get syscall code 115 TRACE_SAVE_TL_VAL(%g3, %g1) 116 TRACE_SAVE_GL_VAL(%g3, %g0) 117 set TT_SC_ENTR, %g2 118 stha %g2, [%g3 + TRAP_ENT_TT]%asi 119 stxa %g7, [%g3 + TRAP_ENT_TSTATE]%asi ! save thread in tstate space 120 stna %sp, [%g3 + TRAP_ENT_SP]%asi 121 stna %o0, [%g3 + TRAP_ENT_F1]%asi 122 stna %o1, [%g3 + TRAP_ENT_F2]%asi 123 stna %o2, [%g3 + TRAP_ENT_F3]%asi 124 stna %o3, [%g3 + TRAP_ENT_F4]%asi 125 stna %o4, [%g3 + TRAP_ENT_TPC]%asi 126 stna %o5, [%g3 + TRAP_ENT_TR]%asi 127 TRACE_NEXT(%g3, %g2, %g1) ! set new trace pointer 128 wrpr %g0, %l3, %pstate ! enable interrupt 129 #endif /* TRAPTRACE */ 130 131 ! 132 ! Test for pre-system-call handling 133 ! 134 ldub [THREAD_REG + T_PRE_SYS], %g3 ! pre-syscall proc? 135 #ifdef SYSCALLTRACE 136 sethi %hi(syscalltrace), %g4 137 ld [%g4 + %lo(syscalltrace)], %g4 138 orcc %g3, %g4, %g0 ! pre_syscall OR syscalltrace? 139 #else 140 tst %g3 ! is pre_syscall flag set? 141 #endif /* SYSCALLTRACE */ 142 143 bnz,pn %icc, _syscall_pre 144 nop 145 146 ! Fast path invocation of new_mstate 147 148 mov LMS_USER, %o0 149 call syscall_mstate 150 mov LMS_SYSTEM, %o1 151 152 ldx [%l1 + O0_OFF], %o0 ! restore %o0 153 ldx [%l1 + O1_OFF], %o1 ! restore %o1 154 ldx [%l1 + O2_OFF], %o2 155 ldx [%l1 + O3_OFF], %o3 156 ldx [%l1 + O4_OFF], %o4 157 ldx [%l1 + O5_OFF], %o5 158 159 ! lwp_arg now set up 160 3: 161 ! 162 ! Call the handler. The %o's and lwp_arg have been set up. 163 ! 164 ldx [%l1 + G1_OFF], %g1 ! get code 165 set sysent, %g3 ! load address of vector table 166 cmp %g1, NSYSCALL ! check range 167 sth %g1, [THREAD_REG + T_SYSNUM] ! save syscall code 168 bgeu,pn %ncc, _syscall_ill 169 sll %g1, SYSENT_SHIFT, %g4 ! delay - get index 170 add %g3, %g4, %l4 171 ldn [%l4 + SY_CALLC], %g3 ! load system call handler 172 173 call %g3 ! call system call handler 174 nop 175 ! 176 ! If handler returns two ints, then we need to split the 64-bit 177 ! return value in %o0 into %o0 and %o1 178 ! 179 lduh [%l4 + SY_FLAGS], %l4 ! load sy_flags 180 andcc %l4, SE_32RVAL2, %g0 ! check for 2 x 32-bit 181 bz,pt %xcc, 5f 182 nop 183 srl %o0, 0, %o1 ! lower 32-bits into %o1 184 srlx %o0, 32, %o0 ! upper 32-bits into %o0 185 5: 186 187 #ifdef TRAPTRACE 188 ! 189 ! make trap trace entry for return - helps in debugging 190 ! 191 rdpr %pstate, %g5 192 andn %g5, PSTATE_IE | PSTATE_AM, %g4 193 wrpr %g0, %g4, %pstate ! disable interrupt 194 TRACE_PTR(%g4, %g2) ! get trace pointer 195 GET_TRACE_TICK(%g2, %g3) 196 stxa %g2, [%g4 + TRAP_ENT_TICK]%asi 197 lduh [THREAD_REG + T_SYSNUM], %g2 198 TRACE_SAVE_TL_VAL(%g4, %g2) 199 TRACE_SAVE_GL_VAL(%g4, %g0) 200 mov TT_SC_RET, %g2 ! system call return code 201 stha %g2, [%g4 + TRAP_ENT_TT]%asi 202 ldn [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 203 stna %g2, [%g4 + TRAP_ENT_TPC]%asi 204 ldx [%l1 + TSTATE_OFF], %g2 ! get saved tstate 205 stxa %g2, [%g4 + TRAP_ENT_TSTATE]%asi 206 stna %sp, [%g4 + TRAP_ENT_SP]%asi 207 stna THREAD_REG, [%g4 + TRAP_ENT_TR]%asi 208 stna %o0, [%g4 + TRAP_ENT_F1]%asi 209 stna %o1, [%g4 + TRAP_ENT_F2]%asi 210 stna %g0, [%g4 + TRAP_ENT_F3]%asi 211 stna %g0, [%g4 + TRAP_ENT_F4]%asi 212 TRACE_NEXT(%g4, %g2, %g3) ! set new trace pointer 213 wrpr %g0, %g5, %pstate ! enable interrupt 214 #endif /* TRAPTRACE */ 215 ! 216 ! Check for post-syscall processing. 217 ! This tests all members of the union containing t_astflag, t_post_sys, 218 ! and t_sig_check with one test. 219 ! 220 ld [THREAD_REG + T_POST_SYS_AST], %g1 221 #ifdef SYSCALLTRACE 222 sethi %hi(syscalltrace), %g4 223 ld [%g4 + %lo(syscalltrace)], %g4 224 orcc %g4, %g1, %g0 ! OR in syscalltrace 225 #else 226 tst %g1 ! need post-processing? 227 #endif /* SYSCALLTRACE */ 228 bnz,pn %icc, _syscall_post ! yes - post_syscall or AST set 229 mov LWP_USER, %g1 230 stb %g1, [%l2 + LWP_STATE] ! set lwp_state 231 stx %o0, [%l1 + O0_OFF] ! set rp->r_o0 232 stx %o1, [%l1 + O1_OFF] ! set rp->r_o1 233 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 234 ldx [%l1 + TSTATE_OFF], %g1 ! get saved tstate 235 ldn [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 236 mov CCR_IC, %g3 237 sllx %g3, TSTATE_CCR_SHIFT, %g3 238 add %g2, 4, %g4 ! calc new npc 239 andn %g1, %g3, %g1 ! clear carry bit for no error 240 stn %g2, [%l1 + PC_OFF] 241 stn %g4, [%l1 + nPC_OFF] 242 stx %g1, [%l1 + TSTATE_OFF] 243 244 ! Switch mstate back on the way out 245 246 mov LMS_SYSTEM, %o0 247 call syscall_mstate 248 mov LMS_USER, %o1 249 jmp %l0 + 8 250 nop 251 252 _syscall_pre: 253 ldx [%l1 + G1_OFF], %g1 254 call pre_syscall ! abort = pre_syscall(arg0) 255 sth %g1, [THREAD_REG + T_SYSNUM] 256 257 brnz,pn %o0, _syscall_post ! did it abort? 258 nop 259 ldx [%l1 + O0_OFF], %o0 ! reload args 260 ldx [%l1 + O1_OFF], %o1 261 ldx [%l1 + O2_OFF], %o2 262 ldx [%l1 + O3_OFF], %o3 263 ldx [%l1 + O4_OFF], %o4 264 ba,pt %xcc, 3b 265 ldx [%l1 + O5_OFF], %o5 266 267 ! 268 ! Floating-point trap was pending at start of system call. 269 ! Here with: 270 ! %l3 = mpcb_flags 271 ! 272 _syscall_fp: 273 andn %l3, FP_TRAPPED, %l3 274 st %l3, [%sp + STACK_BIAS + MPCB_FLAGS] ! clear FP_TRAPPED 275 jmp %l0 + 8 ! return to user_rtt 276 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 277 278 ! 279 ! illegal system call - syscall number out of range 280 ! 281 _syscall_ill: 282 call nosys 283 nop 284 ! 285 ! Post-syscall with special processing needed. 286 ! 287 _syscall_post: 288 call post_syscall ! post_syscall(rvals) 289 nop 290 jmp %l0 + 8 ! return to user_rtt 291 nop 292 SET_SIZE(syscall_trap) 293 #endif /* lint */ 294 295 #if defined(lint) || defined(__lint) 296 297 void 298 syscall_trap32(void) /* for tags only - trap handler - not called from C */ 299 {} 300 301 #else /* lint */ 302 303 /* 304 * System call trap handler for ILP32 processes. 305 * 306 * We branch here from sys_trap when a system call occurs. 307 * 308 * Entry: 309 * %o0 = regs 310 * 311 * Usage: 312 * %l0 = saved return address 313 * %l1 = saved regs 314 * %l2 = lwp 315 */ 316 ENTRY_NP(syscall_trap32) 317 ldx [THREAD_REG + T_CPU], %g1 ! get cpu pointer 318 mov %o7, %l0 ! save return addr 319 320 ! 321 ! If the trapping thread has the address mask bit clear, then it's 322 ! a 64-bit process, and has no business calling 32-bit syscalls. 323 ! 324 ldx [%o0 + TSTATE_OFF], %l1 ! saved %tstate.am is that 325 andcc %l1, TSTATE_AM, %l1 ! of the trapping proc 326 be,pn %xcc, _syscall_ill32 ! 327 mov %o0, %l1 ! save reg pointer 328 srl %i0, 0, %o0 ! copy 1st arg, clear high bits 329 srl %i1, 0, %o1 ! copy 2nd arg, clear high bits 330 ldx [%g1 + CPU_STATS_SYS_SYSCALL], %g2 331 inc %g2 ! cpu_stats.sys.syscall++ 332 stx %g2, [%g1 + CPU_STATS_SYS_SYSCALL] 333 334 ! 335 ! Set new state for LWP 336 ! 337 ldx [THREAD_REG + T_LWP], %l2 338 mov LWP_SYS, %g3 339 srl %i2, 0, %o2 ! copy 3rd arg, clear high bits 340 stb %g3, [%l2 + LWP_STATE] 341 srl %i3, 0, %o3 ! copy 4th arg, clear high bits 342 ldx [%l2 + LWP_RU_SYSC], %g2 ! pesky statistics 343 srl %i4, 0, %o4 ! copy 5th arg, clear high bits 344 addx %g2, 1, %g2 345 stx %g2, [%l2 + LWP_RU_SYSC] 346 srl %i5, 0, %o5 ! copy 6th arg, clear high bits 347 ! args for direct syscalls now set up 348 349 #ifdef TRAPTRACE 350 ! 351 ! make trap trace entry - helps in debugging 352 ! 353 rdpr %pstate, %l3 354 andn %l3, PSTATE_IE | PSTATE_AM, %g3 355 wrpr %g0, %g3, %pstate ! disable interrupt 356 TRACE_PTR(%g3, %g2) ! get trace pointer 357 GET_TRACE_TICK(%g1, %g2) 358 stxa %g1, [%g3 + TRAP_ENT_TICK]%asi 359 ldx [%l1 + G1_OFF], %g1 ! get syscall code 360 TRACE_SAVE_TL_VAL(%g3, %g1) 361 TRACE_SAVE_GL_VAL(%g3, %g0) 362 set TT_SC_ENTR, %g2 363 stha %g2, [%g3 + TRAP_ENT_TT]%asi 364 stxa %g7, [%g3 + TRAP_ENT_TSTATE]%asi ! save thread in tstate space 365 stna %sp, [%g3 + TRAP_ENT_SP]%asi 366 stna %o0, [%g3 + TRAP_ENT_F1]%asi 367 stna %o1, [%g3 + TRAP_ENT_F2]%asi 368 stna %o2, [%g3 + TRAP_ENT_F3]%asi 369 stna %o3, [%g3 + TRAP_ENT_F4]%asi 370 stna %o4, [%g3 + TRAP_ENT_TPC]%asi 371 stna %o5, [%g3 + TRAP_ENT_TR]%asi 372 TRACE_NEXT(%g3, %g2, %g1) ! set new trace pointer 373 wrpr %g0, %l3, %pstate ! enable interrupt 374 #endif /* TRAPTRACE */ 375 376 ! 377 ! Test for pre-system-call handling 378 ! 379 ldub [THREAD_REG + T_PRE_SYS], %g3 ! pre-syscall proc? 380 #ifdef SYSCALLTRACE 381 sethi %hi(syscalltrace), %g4 382 ld [%g4 + %lo(syscalltrace)], %g4 383 orcc %g3, %g4, %g0 ! pre_syscall OR syscalltrace? 384 #else 385 tst %g3 ! is pre_syscall flag set? 386 #endif /* SYSCALLTRACE */ 387 bnz,pn %icc, _syscall_pre32 ! yes - pre_syscall needed 388 nop 389 390 ! Fast path invocation of new_mstate 391 mov LMS_USER, %o0 392 call syscall_mstate 393 mov LMS_SYSTEM, %o1 394 395 lduw [%l1 + O0_OFF + 4], %o0 ! reload 32-bit args 396 lduw [%l1 + O1_OFF + 4], %o1 397 lduw [%l1 + O2_OFF + 4], %o2 398 lduw [%l1 + O3_OFF + 4], %o3 399 lduw [%l1 + O4_OFF + 4], %o4 400 lduw [%l1 + O5_OFF + 4], %o5 401 402 ! lwp_arg now set up 403 3: 404 ! 405 ! Call the handler. The %o's have been set up. 406 ! 407 lduw [%l1 + G1_OFF + 4], %g1 ! get 32-bit code 408 set sysent32, %g3 ! load address of vector table 409 cmp %g1, NSYSCALL ! check range 410 sth %g1, [THREAD_REG + T_SYSNUM] ! save syscall code 411 bgeu,pn %ncc, _syscall_ill32 412 sll %g1, SYSENT_SHIFT, %g4 ! delay - get index 413 add %g3, %g4, %g5 ! g5 = addr of sysentry 414 ldx [%g5 + SY_CALLC], %g3 ! load system call handler 415 416 brnz,a,pt %g1, 4f ! check for indir() 417 mov %g5, %l4 ! save addr of sysentry 418 ! 419 ! Yuck. If %g1 is zero, that means we're doing a syscall() via the 420 ! indirect system call. That means we have to check the 421 ! flags of the targetted system call, not the indirect system call 422 ! itself. See return value handling code below. 423 ! 424 set sysent32, %l4 ! load address of vector table 425 cmp %o0, NSYSCALL ! check range 426 bgeu,pn %ncc, 4f ! out of range, let C handle it 427 sll %o0, SYSENT_SHIFT, %g4 ! delay - get index 428 add %g4, %l4, %l4 ! compute & save addr of sysent 429 4: 430 call %g3 ! call system call handler 431 nop 432 433 ! 434 ! If handler returns long long then we need to split the 64 bit 435 ! return value in %o0 into %o0 and %o1 for ILP32 clients. 436 ! 437 lduh [%l4 + SY_FLAGS], %g4 ! load sy_flags 438 andcc %g4, SE_64RVAL | SE_32RVAL2, %g0 ! check for 64-bit return 439 bz,a,pt %xcc, 5f 440 srl %o0, 0, %o0 ! 32-bit only 441 srl %o0, 0, %o1 ! lower 32 bits into %o1 442 srlx %o0, 32, %o0 ! upper 32 bits into %o0 443 5: 444 445 #ifdef TRAPTRACE 446 ! 447 ! make trap trace entry for return - helps in debugging 448 ! 449 rdpr %pstate, %g5 450 andn %g5, PSTATE_IE | PSTATE_AM, %g4 451 wrpr %g0, %g4, %pstate ! disable interrupt 452 TRACE_PTR(%g4, %g2) ! get trace pointer 453 GET_TRACE_TICK(%g2, %g3) 454 stxa %g2, [%g4 + TRAP_ENT_TICK]%asi 455 lduh [THREAD_REG + T_SYSNUM], %g2 456 TRACE_SAVE_TL_VAL(%g4, %g2) 457 TRACE_SAVE_GL_VAL(%g4, %g0) 458 mov TT_SC_RET, %g2 ! system call return code 459 stha %g2, [%g4 + TRAP_ENT_TT]%asi 460 ldx [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 461 stna %g2, [%g4 + TRAP_ENT_TPC]%asi 462 ldx [%l1 + TSTATE_OFF], %g2 ! get saved tstate 463 stxa %g2, [%g4 + TRAP_ENT_TSTATE]%asi 464 stna %sp, [%g4 + TRAP_ENT_SP]%asi 465 stna THREAD_REG, [%g4 + TRAP_ENT_TR]%asi 466 stna %o0, [%g4 + TRAP_ENT_F1]%asi 467 stna %o1, [%g4 + TRAP_ENT_F2]%asi 468 stna %g0, [%g4 + TRAP_ENT_F3]%asi 469 stna %g0, [%g4 + TRAP_ENT_F4]%asi 470 TRACE_NEXT(%g4, %g2, %g3) ! set new trace pointer 471 wrpr %g0, %g5, %pstate ! enable interrupt 472 #endif /* TRAPTRACE */ 473 ! 474 ! Check for post-syscall processing. 475 ! This tests all members of the union containing t_astflag, t_post_sys, 476 ! and t_sig_check with one test. 477 ! 478 ld [THREAD_REG + T_POST_SYS_AST], %g1 479 #ifdef SYSCALLTRACE 480 sethi %hi(syscalltrace), %g4 481 ld [%g4 + %lo(syscalltrace)], %g4 482 orcc %g4, %g1, %g0 ! OR in syscalltrace 483 #else 484 tst %g1 ! need post-processing? 485 #endif /* SYSCALLTRACE */ 486 bnz,pn %icc, _syscall_post32 ! yes - post_syscall or AST set 487 mov LWP_USER, %g1 488 stb %g1, [%l2 + LWP_STATE] ! set lwp_state 489 stx %o0, [%l1 + O0_OFF] ! set rp->r_o0 490 stx %o1, [%l1 + O1_OFF] ! set rp->r_o1 491 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 492 ldx [%l1 + TSTATE_OFF], %g1 ! get saved tstate 493 ldx [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 494 mov CCR_IC, %g3 495 sllx %g3, TSTATE_CCR_SHIFT, %g3 496 add %g2, 4, %g4 ! calc new npc 497 andn %g1, %g3, %g1 ! clear carry bit for no error 498 stx %g2, [%l1 + PC_OFF] 499 stx %g4, [%l1 + nPC_OFF] 500 stx %g1, [%l1 + TSTATE_OFF] 501 502 ! fast path outbound microstate accounting call 503 mov LMS_SYSTEM, %o0 504 call syscall_mstate 505 mov LMS_USER, %o1 506 507 jmp %l0 + 8 508 nop 509 510 511 _syscall_pre32: 512 ldx [%l1 + G1_OFF], %g1 513 call pre_syscall ! abort = pre_syscall(arg0) 514 sth %g1, [THREAD_REG + T_SYSNUM] 515 516 brnz,pn %o0, _syscall_post32 ! did it abort? 517 nop 518 lduw [%l1 + O0_OFF + 4], %o0 ! reload 32-bit args 519 lduw [%l1 + O1_OFF + 4], %o1 520 lduw [%l1 + O2_OFF + 4], %o2 521 lduw [%l1 + O3_OFF + 4], %o3 522 lduw [%l1 + O4_OFF + 4], %o4 523 ba,pt %xcc, 3b 524 lduw [%l1 + O5_OFF + 4], %o5 525 526 ! 527 ! Floating-point trap was pending at start of system call. 528 ! Here with: 529 ! %l3 = mpcb_flags 530 ! 531 _syscall_fp32: 532 andn %l3, FP_TRAPPED, %l3 533 st %l3, [%sp + STACK_BIAS + MPCB_FLAGS] ! clear FP_TRAPPED 534 jmp %l0 + 8 ! return to user_rtt 535 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 536 537 ! 538 ! illegal system call - syscall number out of range 539 ! 540 _syscall_ill32: 541 call nosys 542 nop 543 ! 544 ! Post-syscall with special processing needed. 545 ! 546 _syscall_post32: 547 call post_syscall ! post_syscall(rvals) 548 nop 549 jmp %l0 + 8 ! return to user_rtt 550 nop 551 SET_SIZE(syscall_trap32) 552 553 #endif /* lint */ 554 555 556 /* 557 * lwp_rtt - start execution in newly created LWP. 558 * Here with t_post_sys set by lwp_create, and lwp_eosys == JUSTRETURN, 559 * so that post_syscall() will run and the registers will 560 * simply be restored. 561 * This must go out through sys_rtt instead of syscall_rtt. 562 */ 563 #if defined(lint) || defined(__lint) 564 565 void 566 lwp_rtt_initial(void) 567 {} 568 569 void 570 lwp_rtt(void) 571 {} 572 573 #else /* lint */ 574 ENTRY_NP(lwp_rtt_initial) 575 ldn [THREAD_REG + T_STACK], %l7 576 call __dtrace_probe___proc_start 577 sub %l7, STACK_BIAS, %sp 578 ba,a,pt %xcc, 0f 579 580 ENTRY_NP(lwp_rtt) 581 ldn [THREAD_REG + T_STACK], %l7 582 sub %l7, STACK_BIAS, %sp 583 0: 584 call __dtrace_probe___proc_lwp__start 585 nop 586 call dtrace_systrace_rtt 587 add %sp, REGOFF + STACK_BIAS, %l7 588 ldx [%l7 + O0_OFF], %o0 589 call post_syscall 590 ldx [%l7 + O1_OFF], %o1 591 ba,a,pt %xcc, user_rtt 592 SET_SIZE(lwp_rtt) 593 SET_SIZE(lwp_rtt_initial) 594 595 #endif /* lint */ 596
Indexes created Wed Feb 10 05:58:14 UTC 2010
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