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 /* 23 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #include "lint.h" 27 #include "thr_uberdata.h" 28 #include <procfs.h> 29 #include <setjmp.h> 30 #include <sys/fsr.h> 31 #include "sigjmp_struct.h" 32 33 extern int getlwpstatus(thread_t, lwpstatus_t *); 34 extern int putlwpregs(thread_t, prgregset_t); 35 36 /* ARGSUSED2 */ 37 void * 38 setup_top_frame(void *stk, size_t stksize, ulwp_t *ulwp) 39 { 40 uintptr_t stack; 41 char frame[SA(MINFRAME)]; 42 43 /* 44 * Top-of-stack must be rounded down to STACK_ALIGN and 45 * there must be a minimum frame for the register window. 46 */ 47 stack = (((uintptr_t)stk + stksize) & ~(STACK_ALIGN - 1)) - 48 SA(MINFRAME); 49 50 /* 51 * This will return NULL if the kernel cannot allocate 52 * a page for the top page of the stack. This will cause 53 * thr_create(), pthread_create() or pthread_attr_setstack() 54 * to fail, passing the problem up to the application. 55 */ 56 (void) memset(frame, 0, sizeof (frame)); 57 if (uucopy(frame, (void *)stack, sizeof (frame)) == 0) 58 return ((void *)stack); 59 return (NULL); 60 } 61 62 int 63 setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *), 64 ulwp_t *ulwp, caddr_t stk, size_t stksize) 65 { 66 uintptr_t stack; 67 68 /* clear the context */ 69 (void) memset(ucp, 0, sizeof (*ucp)); 70 71 /* 72 * Clear the top stack frame. 73 * If this fails, pass the problem up to the application. 74 */ 75 if ((stack = (uintptr_t)setup_top_frame(stk, stksize, ulwp)) == NULL) 76 return (ENOMEM); 77 78 /* fill in registers of interest */ 79 ucp->uc_flags |= UC_CPU; 80 ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func; 81 ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4; 82 ucp->uc_mcontext.gregs[REG_O0] = (greg_t)ulwp; 83 ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS); 84 ucp->uc_mcontext.gregs[REG_O7] = (greg_t)_lwp_start; 85 ucp->uc_mcontext.gregs[REG_G7] = (greg_t)ulwp; 86 87 return (0); 88 } 89 90 /* 91 * Machine-dependent startup code for a newly-created thread. 92 */ 93 void * 94 _thrp_setup(ulwp_t *self) 95 { 96 extern void _setfsr(greg_t *); 97 98 if (self->ul_fpuenv.fpu_en) 99 _setfsr(&self->ul_fpuenv.fsr); 100 101 self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz); 102 self->ul_ustack.ss_size = self->ul_stksiz; 103 self->ul_ustack.ss_flags = 0; 104 (void) setustack(&self->ul_ustack); 105 106 update_sched(self); 107 tls_setup(); 108 109 /* signals have been deferred until now */ 110 sigon(self); 111 112 if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled) 113 return (NULL); /* cancelled by pthread_create() */ 114 return (self->ul_startpc(self->ul_startarg)); 115 } 116 117 void 118 _fpinherit(ulwp_t *ulwp) 119 { 120 extern void _getfsr(greg_t *); 121 int fpu_enabled; 122 123 #ifdef __sparcv9 124 extern greg_t _getfprs(); 125 fpu_enabled = _getfprs() & FPRS_FEF; 126 #else 127 extern psw_t _getpsr(); 128 fpu_enabled = _getpsr() & PSR_EF; 129 #endif /* __sparcv9 */ 130 131 if (fpu_enabled) { 132 _getfsr(&ulwp->ul_fpuenv.fsr); 133 ulwp->ul_fpuenv.fpu_en = 1; 134 } else { 135 ulwp->ul_fpuenv.fpu_en = 0; 136 } 137 } 138 139 void 140 getgregs(ulwp_t *ulwp, gregset_t rs) 141 { 142 lwpstatus_t status; 143 144 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 145 rs[REG_PC] = status.pr_reg[R_PC]; 146 rs[REG_O6] = status.pr_reg[R_O6]; 147 rs[REG_O7] = status.pr_reg[R_O7]; 148 rs[REG_G1] = status.pr_reg[R_G1]; 149 rs[REG_G2] = status.pr_reg[R_G2]; 150 rs[REG_G3] = status.pr_reg[R_G3]; 151 rs[REG_G4] = status.pr_reg[R_G4]; 152 } else { 153 rs[REG_PC] = 0; 154 rs[REG_O6] = 0; 155 rs[REG_O7] = 0; 156 rs[REG_G1] = 0; 157 rs[REG_G2] = 0; 158 rs[REG_G3] = 0; 159 rs[REG_G4] = 0; 160 } 161 } 162 163 void 164 setgregs(ulwp_t *ulwp, gregset_t rs) 165 { 166 lwpstatus_t status; 167 168 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 169 status.pr_reg[R_PC] = rs[REG_PC]; 170 status.pr_reg[R_O6] = rs[REG_O6]; 171 status.pr_reg[R_O7] = rs[REG_O7]; 172 status.pr_reg[R_G1] = rs[REG_G1]; 173 status.pr_reg[R_G2] = rs[REG_G2]; 174 status.pr_reg[R_G3] = rs[REG_G3]; 175 status.pr_reg[R_G4] = rs[REG_G4]; 176 (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg); 177 } 178 } 179 180 int 181 __csigsetjmp(sigjmp_buf env, int savemask) 182 { 183 sigjmp_struct_t *bp = (sigjmp_struct_t *)env; 184 ulwp_t *self = curthread; 185 186 /* 187 * bp->sjs_sp, bp->sjs_pc, bp->sjs_fp and bp->sjs_i7 are already set. 188 * Also, if we are running in 64-bit mode (__sparcv9), 189 * then bp->sjs_asi and bp->sjs_fprs are already set. 190 */ 191 bp->sjs_flags = JB_FRAMEPTR; 192 bp->sjs_uclink = self->ul_siglink; 193 if (self->ul_ustack.ss_flags & SS_ONSTACK) 194 bp->sjs_stack = self->ul_ustack; 195 else { 196 bp->sjs_stack.ss_sp = 197 (void *)(self->ul_stktop - self->ul_stksiz); 198 bp->sjs_stack.ss_size = self->ul_stksiz; 199 bp->sjs_stack.ss_flags = 0; 200 } 201 if (savemask) { 202 bp->sjs_flags |= JB_SAVEMASK; 203 enter_critical(self); 204 bp->sjs_sigmask = self->ul_sigmask; 205 exit_critical(self); 206 } 207 208 return (0); 209 } 210