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#include "assym.h" 39 40#ifdef TRAPTRACE 41#include <sys/traptrace.h> 42#endif /* TRAPTRACE */ 43 44#if (1 << SYSENT_SHIFT) != SYSENT_SIZE 45#error "SYSENT_SHIFT does not correspond to size of sysent structure" 46#endif 47 48/* 49 * Native System call trap handler. 50 * 51 * We branch here from sys_trap when a 64-bit system call occurs. 52 * 53 * Entry: 54 * %o0 = regs 55 * 56 * Usage: 57 * %l0 = saved return address 58 * %l1 = saved regs 59 * %l2 = lwp 60 */ 61 ENTRY_NP(syscall_trap) 62 ldn [THREAD_REG + T_CPU], %g1 ! get cpu pointer 63 mov %o7, %l0 ! save return addr 64 ! 65 ! If the trapping thread has the address mask bit set, then it's 66 ! a 32-bit process, and has no business calling 64-bit syscalls. 67 ! 68 ldx [%o0 + TSTATE_OFF], %l1 ! saved %tstate.am is that 69 andcc %l1, TSTATE_AM, %l1 ! of the trapping proc 70 bne,pn %xcc, _syscall_ill ! 71 mov %o0, %l1 ! save reg pointer 72 mov %i0, %o0 ! copy 1st arg 73 mov %i1, %o1 ! copy 2nd arg 74 ldx [%g1 + CPU_STATS_SYS_SYSCALL], %g2 75 inc %g2 ! cpu_stats.sys.syscall++ 76 stx %g2, [%g1 + CPU_STATS_SYS_SYSCALL] 77 78 ! 79 ! Set new state for LWP 80 ! 81 ldn [THREAD_REG + T_LWP], %l2 82 mov LWP_SYS, %g3 83 mov %i2, %o2 ! copy 3rd arg 84 stb %g3, [%l2 + LWP_STATE] 85 mov %i3, %o3 ! copy 4th arg 86 ldx [%l2 + LWP_RU_SYSC], %g2 ! pesky statistics 87 mov %i4, %o4 ! copy 5th arg 88 addx %g2, 1, %g2 89 stx %g2, [%l2 + LWP_RU_SYSC] 90 mov %i5, %o5 ! copy 6th arg 91 ! args for direct syscalls now set up 92 93#ifdef TRAPTRACE 94 ! 95 ! make trap trace entry - helps in debugging 96 ! 97 rdpr %pstate, %l3 98 andn %l3, PSTATE_IE | PSTATE_AM, %g3 99 wrpr %g0, %g3, %pstate ! disable interrupt 100 TRACE_PTR(%g3, %g2) ! get trace pointer 101 GET_TRACE_TICK(%g1, %g2) 102 stxa %g1, [%g3 + TRAP_ENT_TICK]%asi 103 ldx [%l1 + G1_OFF], %g1 ! get syscall code 104 TRACE_SAVE_TL_VAL(%g3, %g1) 105 TRACE_SAVE_GL_VAL(%g3, %g0) 106 set TT_SC_ENTR, %g2 107 stha %g2, [%g3 + TRAP_ENT_TT]%asi 108 stxa %g7, [%g3 + TRAP_ENT_TSTATE]%asi ! save thread in tstate space 109 stna %sp, [%g3 + TRAP_ENT_SP]%asi 110 stna %o0, [%g3 + TRAP_ENT_F1]%asi 111 stna %o1, [%g3 + TRAP_ENT_F2]%asi 112 stna %o2, [%g3 + TRAP_ENT_F3]%asi 113 stna %o3, [%g3 + TRAP_ENT_F4]%asi 114 stna %o4, [%g3 + TRAP_ENT_TPC]%asi 115 stna %o5, [%g3 + TRAP_ENT_TR]%asi 116 TRACE_NEXT(%g3, %g2, %g1) ! set new trace pointer 117 wrpr %g0, %l3, %pstate ! enable interrupt 118#endif /* TRAPTRACE */ 119 120 ! 121 ! Test for pre-system-call handling 122 ! 123 ldub [THREAD_REG + T_PRE_SYS], %g3 ! pre-syscall proc? 124#ifdef SYSCALLTRACE 125 sethi %hi(syscalltrace), %g4 126 ld [%g4 + %lo(syscalltrace)], %g4 127 orcc %g3, %g4, %g0 ! pre_syscall OR syscalltrace? 128#else 129 tst %g3 ! is pre_syscall flag set? 130#endif /* SYSCALLTRACE */ 131 132 bnz,pn %icc, _syscall_pre 133 nop 134 135 ! Fast path invocation of new_mstate 136 137 mov LMS_USER, %o0 138 call syscall_mstate 139 mov LMS_SYSTEM, %o1 140 141 ldx [%l1 + O0_OFF], %o0 ! restore %o0 142 ldx [%l1 + O1_OFF], %o1 ! restore %o1 143 ldx [%l1 + O2_OFF], %o2 144 ldx [%l1 + O3_OFF], %o3 145 ldx [%l1 + O4_OFF], %o4 146 ldx [%l1 + O5_OFF], %o5 147 148 ! lwp_arg now set up 1493: 150 ! 151 ! Call the handler. The %o's and lwp_arg have been set up. 152 ! 153 ldx [%l1 + G1_OFF], %g1 ! get code 154 set sysent, %g3 ! load address of vector table 155 cmp %g1, NSYSCALL ! check range 156 sth %g1, [THREAD_REG + T_SYSNUM] ! save syscall code 157 bgeu,pn %ncc, _syscall_ill 158 sll %g1, SYSENT_SHIFT, %g4 ! delay - get index 159 add %g3, %g4, %l4 160 ldn [%l4 + SY_CALLC], %g3 ! load system call handler 161 162 call %g3 ! call system call handler 163 nop 164 ! 165 ! If handler returns two ints, then we need to split the 64-bit 166 ! return value in %o0 into %o0 and %o1 167 ! 168 lduh [%l4 + SY_FLAGS], %l4 ! load sy_flags 169 andcc %l4, SE_32RVAL2, %g0 ! check for 2 x 32-bit 170 bz,pt %xcc, 5f 171 nop 172 srl %o0, 0, %o1 ! lower 32-bits into %o1 173 srlx %o0, 32, %o0 ! upper 32-bits into %o0 1745: 175 176#ifdef TRAPTRACE 177 ! 178 ! make trap trace entry for return - helps in debugging 179 ! 180 rdpr %pstate, %g5 181 andn %g5, PSTATE_IE | PSTATE_AM, %g4 182 wrpr %g0, %g4, %pstate ! disable interrupt 183 TRACE_PTR(%g4, %g2) ! get trace pointer 184 GET_TRACE_TICK(%g2, %g3) 185 stxa %g2, [%g4 + TRAP_ENT_TICK]%asi 186 lduh [THREAD_REG + T_SYSNUM], %g2 187 TRACE_SAVE_TL_VAL(%g4, %g2) 188 TRACE_SAVE_GL_VAL(%g4, %g0) 189 mov TT_SC_RET, %g2 ! system call return code 190 stha %g2, [%g4 + TRAP_ENT_TT]%asi 191 ldn [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 192 stna %g2, [%g4 + TRAP_ENT_TPC]%asi 193 ldx [%l1 + TSTATE_OFF], %g2 ! get saved tstate 194 stxa %g2, [%g4 + TRAP_ENT_TSTATE]%asi 195 stna %sp, [%g4 + TRAP_ENT_SP]%asi 196 stna THREAD_REG, [%g4 + TRAP_ENT_TR]%asi 197 stna %o0, [%g4 + TRAP_ENT_F1]%asi 198 stna %o1, [%g4 + TRAP_ENT_F2]%asi 199 stna %g0, [%g4 + TRAP_ENT_F3]%asi 200 stna %g0, [%g4 + TRAP_ENT_F4]%asi 201 TRACE_NEXT(%g4, %g2, %g3) ! set new trace pointer 202 wrpr %g0, %g5, %pstate ! enable interrupt 203#endif /* TRAPTRACE */ 204 ! 205 ! Check for post-syscall processing. 206 ! This tests all members of the union containing t_astflag, t_post_sys, 207 ! and t_sig_check with one test. 208 ! 209 ld [THREAD_REG + T_POST_SYS_AST], %g1 210#ifdef SYSCALLTRACE 211 sethi %hi(syscalltrace), %g4 212 ld [%g4 + %lo(syscalltrace)], %g4 213 orcc %g4, %g1, %g0 ! OR in syscalltrace 214#else 215 tst %g1 ! need post-processing? 216#endif /* SYSCALLTRACE */ 217 bnz,pn %icc, _syscall_post ! yes - post_syscall or AST set 218 mov LWP_USER, %g1 219 stb %g1, [%l2 + LWP_STATE] ! set lwp_state 220 stx %o0, [%l1 + O0_OFF] ! set rp->r_o0 221 stx %o1, [%l1 + O1_OFF] ! set rp->r_o1 222 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 223 ldx [%l1 + TSTATE_OFF], %g1 ! get saved tstate 224 ldn [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 225 mov CCR_IC, %g3 226 sllx %g3, TSTATE_CCR_SHIFT, %g3 227 add %g2, 4, %g4 ! calc new npc 228 andn %g1, %g3, %g1 ! clear carry bit for no error 229 stn %g2, [%l1 + PC_OFF] 230 stn %g4, [%l1 + nPC_OFF] 231 stx %g1, [%l1 + TSTATE_OFF] 232 233 ! Switch mstate back on the way out 234 235 mov LMS_SYSTEM, %o0 236 call syscall_mstate 237 mov LMS_USER, %o1 238 jmp %l0 + 8 239 nop 240 241_syscall_pre: 242 ldx [%l1 + G1_OFF], %g1 243 call pre_syscall ! abort = pre_syscall(arg0) 244 sth %g1, [THREAD_REG + T_SYSNUM] 245 246 brnz,pn %o0, _syscall_post ! did it abort? 247 nop 248 ldx [%l1 + O0_OFF], %o0 ! reload args 249 ldx [%l1 + O1_OFF], %o1 250 ldx [%l1 + O2_OFF], %o2 251 ldx [%l1 + O3_OFF], %o3 252 ldx [%l1 + O4_OFF], %o4 253 ba,pt %xcc, 3b 254 ldx [%l1 + O5_OFF], %o5 255 256 ! 257 ! Floating-point trap was pending at start of system call. 258 ! Here with: 259 ! %l3 = mpcb_flags 260 ! 261_syscall_fp: 262 andn %l3, FP_TRAPPED, %l3 263 st %l3, [%sp + STACK_BIAS + MPCB_FLAGS] ! clear FP_TRAPPED 264 jmp %l0 + 8 ! return to user_rtt 265 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 266 267 ! 268 ! illegal system call - syscall number out of range 269 ! 270_syscall_ill: 271 call nosys 272 nop 273 ! 274 ! Post-syscall with special processing needed. 275 ! 276_syscall_post: 277 call post_syscall ! post_syscall(rvals) 278 nop 279 jmp %l0 + 8 ! return to user_rtt 280 nop 281 SET_SIZE(syscall_trap) 282 283/* 284 * System call trap handler for ILP32 processes. 285 * 286 * We branch here from sys_trap when a system call occurs. 287 * 288 * Entry: 289 * %o0 = regs 290 * 291 * Usage: 292 * %l0 = saved return address 293 * %l1 = saved regs 294 * %l2 = lwp 295 */ 296 ENTRY_NP(syscall_trap32) 297 ldx [THREAD_REG + T_CPU], %g1 ! get cpu pointer 298 mov %o7, %l0 ! save return addr 299 300 ! 301 ! If the trapping thread has the address mask bit clear, then it's 302 ! a 64-bit process, and has no business calling 32-bit syscalls. 303 ! 304 ldx [%o0 + TSTATE_OFF], %l1 ! saved %tstate.am is that 305 andcc %l1, TSTATE_AM, %l1 ! of the trapping proc 306 be,pn %xcc, _syscall_ill32 ! 307 mov %o0, %l1 ! save reg pointer 308 srl %i0, 0, %o0 ! copy 1st arg, clear high bits 309 srl %i1, 0, %o1 ! copy 2nd arg, clear high bits 310 ldx [%g1 + CPU_STATS_SYS_SYSCALL], %g2 311 inc %g2 ! cpu_stats.sys.syscall++ 312 stx %g2, [%g1 + CPU_STATS_SYS_SYSCALL] 313 314 ! 315 ! Set new state for LWP 316 ! 317 ldx [THREAD_REG + T_LWP], %l2 318 mov LWP_SYS, %g3 319 srl %i2, 0, %o2 ! copy 3rd arg, clear high bits 320 stb %g3, [%l2 + LWP_STATE] 321 srl %i3, 0, %o3 ! copy 4th arg, clear high bits 322 ldx [%l2 + LWP_RU_SYSC], %g2 ! pesky statistics 323 srl %i4, 0, %o4 ! copy 5th arg, clear high bits 324 addx %g2, 1, %g2 325 stx %g2, [%l2 + LWP_RU_SYSC] 326 srl %i5, 0, %o5 ! copy 6th arg, clear high bits 327 ! args for direct syscalls now set up 328 329#ifdef TRAPTRACE 330 ! 331 ! make trap trace entry - helps in debugging 332 ! 333 rdpr %pstate, %l3 334 andn %l3, PSTATE_IE | PSTATE_AM, %g3 335 wrpr %g0, %g3, %pstate ! disable interrupt 336 TRACE_PTR(%g3, %g2) ! get trace pointer 337 GET_TRACE_TICK(%g1, %g2) 338 stxa %g1, [%g3 + TRAP_ENT_TICK]%asi 339 ldx [%l1 + G1_OFF], %g1 ! get syscall code 340 TRACE_SAVE_TL_VAL(%g3, %g1) 341 TRACE_SAVE_GL_VAL(%g3, %g0) 342 set TT_SC_ENTR, %g2 343 stha %g2, [%g3 + TRAP_ENT_TT]%asi 344 stxa %g7, [%g3 + TRAP_ENT_TSTATE]%asi ! save thread in tstate space 345 stna %sp, [%g3 + TRAP_ENT_SP]%asi 346 stna %o0, [%g3 + TRAP_ENT_F1]%asi 347 stna %o1, [%g3 + TRAP_ENT_F2]%asi 348 stna %o2, [%g3 + TRAP_ENT_F3]%asi 349 stna %o3, [%g3 + TRAP_ENT_F4]%asi 350 stna %o4, [%g3 + TRAP_ENT_TPC]%asi 351 stna %o5, [%g3 + TRAP_ENT_TR]%asi 352 TRACE_NEXT(%g3, %g2, %g1) ! set new trace pointer 353 wrpr %g0, %l3, %pstate ! enable interrupt 354#endif /* TRAPTRACE */ 355 356 ! 357 ! Test for pre-system-call handling 358 ! 359 ldub [THREAD_REG + T_PRE_SYS], %g3 ! pre-syscall proc? 360#ifdef SYSCALLTRACE 361 sethi %hi(syscalltrace), %g4 362 ld [%g4 + %lo(syscalltrace)], %g4 363 orcc %g3, %g4, %g0 ! pre_syscall OR syscalltrace? 364#else 365 tst %g3 ! is pre_syscall flag set? 366#endif /* SYSCALLTRACE */ 367 bnz,pn %icc, _syscall_pre32 ! yes - pre_syscall needed 368 nop 369 370 ! Fast path invocation of new_mstate 371 mov LMS_USER, %o0 372 call syscall_mstate 373 mov LMS_SYSTEM, %o1 374 375 lduw [%l1 + O0_OFF + 4], %o0 ! reload 32-bit args 376 lduw [%l1 + O1_OFF + 4], %o1 377 lduw [%l1 + O2_OFF + 4], %o2 378 lduw [%l1 + O3_OFF + 4], %o3 379 lduw [%l1 + O4_OFF + 4], %o4 380 lduw [%l1 + O5_OFF + 4], %o5 381 382 ! lwp_arg now set up 3833: 384 ! 385 ! Call the handler. The %o's have been set up. 386 ! 387 lduw [%l1 + G1_OFF + 4], %g1 ! get 32-bit code 388 set sysent32, %g3 ! load address of vector table 389 cmp %g1, NSYSCALL ! check range 390 sth %g1, [THREAD_REG + T_SYSNUM] ! save syscall code 391 bgeu,pn %ncc, _syscall_ill32 392 sll %g1, SYSENT_SHIFT, %g4 ! delay - get index 393 add %g3, %g4, %g5 ! g5 = addr of sysentry 394 ldx [%g5 + SY_CALLC], %g3 ! load system call handler 395 396 brnz,a,pt %g1, 4f ! check for indir() 397 mov %g5, %l4 ! save addr of sysentry 398 ! 399 ! Yuck. If %g1 is zero, that means we're doing a syscall() via the 400 ! indirect system call. That means we have to check the 401 ! flags of the targetted system call, not the indirect system call 402 ! itself. See return value handling code below. 403 ! 404 set sysent32, %l4 ! load address of vector table 405 cmp %o0, NSYSCALL ! check range 406 bgeu,pn %ncc, 4f ! out of range, let C handle it 407 sll %o0, SYSENT_SHIFT, %g4 ! delay - get index 408 add %g4, %l4, %l4 ! compute & save addr of sysent 4094: 410 call %g3 ! call system call handler 411 nop 412 413 ! 414 ! If handler returns long long then we need to split the 64 bit 415 ! return value in %o0 into %o0 and %o1 for ILP32 clients. 416 ! 417 lduh [%l4 + SY_FLAGS], %g4 ! load sy_flags 418 andcc %g4, SE_64RVAL | SE_32RVAL2, %g0 ! check for 64-bit return 419 bz,a,pt %xcc, 5f 420 srl %o0, 0, %o0 ! 32-bit only 421 srl %o0, 0, %o1 ! lower 32 bits into %o1 422 srlx %o0, 32, %o0 ! upper 32 bits into %o0 4235: 424 425#ifdef TRAPTRACE 426 ! 427 ! make trap trace entry for return - helps in debugging 428 ! 429 rdpr %pstate, %g5 430 andn %g5, PSTATE_IE | PSTATE_AM, %g4 431 wrpr %g0, %g4, %pstate ! disable interrupt 432 TRACE_PTR(%g4, %g2) ! get trace pointer 433 GET_TRACE_TICK(%g2, %g3) 434 stxa %g2, [%g4 + TRAP_ENT_TICK]%asi 435 lduh [THREAD_REG + T_SYSNUM], %g2 436 TRACE_SAVE_TL_VAL(%g4, %g2) 437 TRACE_SAVE_GL_VAL(%g4, %g0) 438 mov TT_SC_RET, %g2 ! system call return code 439 stha %g2, [%g4 + TRAP_ENT_TT]%asi 440 ldx [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 441 stna %g2, [%g4 + TRAP_ENT_TPC]%asi 442 ldx [%l1 + TSTATE_OFF], %g2 ! get saved tstate 443 stxa %g2, [%g4 + TRAP_ENT_TSTATE]%asi 444 stna %sp, [%g4 + TRAP_ENT_SP]%asi 445 stna THREAD_REG, [%g4 + TRAP_ENT_TR]%asi 446 stna %o0, [%g4 + TRAP_ENT_F1]%asi 447 stna %o1, [%g4 + TRAP_ENT_F2]%asi 448 stna %g0, [%g4 + TRAP_ENT_F3]%asi 449 stna %g0, [%g4 + TRAP_ENT_F4]%asi 450 TRACE_NEXT(%g4, %g2, %g3) ! set new trace pointer 451 wrpr %g0, %g5, %pstate ! enable interrupt 452#endif /* TRAPTRACE */ 453 ! 454 ! Check for post-syscall processing. 455 ! This tests all members of the union containing t_astflag, t_post_sys, 456 ! and t_sig_check with one test. 457 ! 458 ld [THREAD_REG + T_POST_SYS_AST], %g1 459#ifdef SYSCALLTRACE 460 sethi %hi(syscalltrace), %g4 461 ld [%g4 + %lo(syscalltrace)], %g4 462 orcc %g4, %g1, %g0 ! OR in syscalltrace 463#else 464 tst %g1 ! need post-processing? 465#endif /* SYSCALLTRACE */ 466 bnz,pn %icc, _syscall_post32 ! yes - post_syscall or AST set 467 mov LWP_USER, %g1 468 stb %g1, [%l2 + LWP_STATE] ! set lwp_state 469 stx %o0, [%l1 + O0_OFF] ! set rp->r_o0 470 stx %o1, [%l1 + O1_OFF] ! set rp->r_o1 471 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 472 ldx [%l1 + TSTATE_OFF], %g1 ! get saved tstate 473 ldx [%l1 + nPC_OFF], %g2 ! get saved npc (new pc) 474 mov CCR_IC, %g3 475 sllx %g3, TSTATE_CCR_SHIFT, %g3 476 add %g2, 4, %g4 ! calc new npc 477 andn %g1, %g3, %g1 ! clear carry bit for no error 478 stx %g2, [%l1 + PC_OFF] 479 stx %g4, [%l1 + nPC_OFF] 480 stx %g1, [%l1 + TSTATE_OFF] 481 482 ! fast path outbound microstate accounting call 483 mov LMS_SYSTEM, %o0 484 call syscall_mstate 485 mov LMS_USER, %o1 486 487 jmp %l0 + 8 488 nop 489 490 491_syscall_pre32: 492 ldx [%l1 + G1_OFF], %g1 493 call pre_syscall ! abort = pre_syscall(arg0) 494 sth %g1, [THREAD_REG + T_SYSNUM] 495 496 brnz,pn %o0, _syscall_post32 ! did it abort? 497 nop 498 lduw [%l1 + O0_OFF + 4], %o0 ! reload 32-bit args 499 lduw [%l1 + O1_OFF + 4], %o1 500 lduw [%l1 + O2_OFF + 4], %o2 501 lduw [%l1 + O3_OFF + 4], %o3 502 lduw [%l1 + O4_OFF + 4], %o4 503 ba,pt %xcc, 3b 504 lduw [%l1 + O5_OFF + 4], %o5 505 506 ! 507 ! Floating-point trap was pending at start of system call. 508 ! Here with: 509 ! %l3 = mpcb_flags 510 ! 511_syscall_fp32: 512 andn %l3, FP_TRAPPED, %l3 513 st %l3, [%sp + STACK_BIAS + MPCB_FLAGS] ! clear FP_TRAPPED 514 jmp %l0 + 8 ! return to user_rtt 515 clrh [THREAD_REG + T_SYSNUM] ! clear syscall code 516 517 ! 518 ! illegal system call - syscall number out of range 519 ! 520_syscall_ill32: 521 call nosys 522 nop 523 ! 524 ! Post-syscall with special processing needed. 525 ! 526_syscall_post32: 527 call post_syscall ! post_syscall(rvals) 528 nop 529 jmp %l0 + 8 ! return to user_rtt 530 nop 531 SET_SIZE(syscall_trap32) 532 533 534/* 535 * lwp_rtt - start execution in newly created LWP. 536 * Here with t_post_sys set by lwp_create, and lwp_eosys == JUSTRETURN, 537 * so that post_syscall() will run and the registers will 538 * simply be restored. 539 * This must go out through sys_rtt instead of syscall_rtt. 540 */ 541 ENTRY_NP(lwp_rtt_initial) 542 ldn [THREAD_REG + T_STACK], %l7 543 call __dtrace_probe___proc_start 544 sub %l7, STACK_BIAS, %sp 545 ba,a,pt %xcc, 0f 546 547 ENTRY_NP(lwp_rtt) 548 ldn [THREAD_REG + T_STACK], %l7 549 sub %l7, STACK_BIAS, %sp 5500: 551 call __dtrace_probe___proc_lwp__start 552 nop 553 call dtrace_systrace_rtt 554 add %sp, REGOFF + STACK_BIAS, %l7 555 ldx [%l7 + O0_OFF], %o0 556 call post_syscall 557 ldx [%l7 + O1_OFF], %o1 558 ba,a,pt %xcc, user_rtt 559 SET_SIZE(lwp_rtt) 560 SET_SIZE(lwp_rtt_initial) 561 562