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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include "thr_uberdata.h" 31 #include <procfs.h> 32 #include <ucontext.h> 33 #include <setjmp.h> 34 35 extern int getlwpstatus(thread_t, lwpstatus_t *); 36 extern int putlwpregs(thread_t, prgregset_t); 37 38 int 39 setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *), 40 ulwp_t *ulwp, caddr_t stk, size_t stksize) 41 { 42 uint64_t *stack; 43 44 /* clear the context */ 45 (void) memset(ucp, 0, sizeof (*ucp)); 46 47 /* setup to store the current thread pointer in %fs */ 48 ucp->uc_mcontext.gregs[REG_FSBASE] = (greg_t)ulwp; 49 ucp->uc_mcontext.gregs[REG_FS] = 0; /* null selector indicates fsbase */ 50 51 /* all contexts should have a valid data segment descriptor for %ss */ 52 ucp->uc_mcontext.gregs[REG_SS] = UDS_SEL; 53 54 /* top-of-stack must be rounded down to STACK_ALIGN */ 55 stack = (uint64_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1)); 56 57 /* set up top stack frame */ 58 *--stack = 0; 59 *--stack = 0; 60 *--stack = (uint64_t)_lwp_start; 61 62 /* fill in registers of interest */ 63 ucp->uc_flags |= UC_CPU; 64 ucp->uc_mcontext.gregs[REG_RDI] = (greg_t)ulwp; 65 ucp->uc_mcontext.gregs[REG_RIP] = (greg_t)func; 66 ucp->uc_mcontext.gregs[REG_RSP] = (greg_t)stack; 67 ucp->uc_mcontext.gregs[REG_RBP] = (greg_t)(stack+1); 68 69 return (0); 70 } 71 72 /* 73 * Machine-dependent startup code for a newly-created thread. 74 */ 75 void * 76 _thr_setup(ulwp_t *self) 77 { 78 self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz); 79 self->ul_ustack.ss_size = self->ul_stksiz; 80 self->ul_ustack.ss_flags = 0; 81 (void) setustack(&self->ul_ustack); 82 83 update_sched(self); 84 tls_setup(); 85 86 /* signals have been deferred until now */ 87 sigon(self); 88 89 if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled) 90 return (NULL); /* cancelled by pthread_create() */ 91 return (self->ul_startpc(self->ul_startarg)); 92 } 93 94 void 95 _fpinherit(ulwp_t *ulwp) 96 { 97 ulwp->ul_fpuenv.ftag = 0xffffffff; 98 } 99 100 void 101 getgregs(ulwp_t *ulwp, gregset_t rs) 102 { 103 lwpstatus_t status; 104 105 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 106 rs[REG_RBX] = status.pr_reg[REG_RBX]; 107 rs[REG_R12] = status.pr_reg[REG_R12]; 108 rs[REG_R13] = status.pr_reg[REG_R13]; 109 rs[REG_R14] = status.pr_reg[REG_R14]; 110 rs[REG_R15] = status.pr_reg[REG_R15]; 111 rs[REG_RBP] = status.pr_reg[REG_RBP]; 112 rs[REG_RSP] = status.pr_reg[REG_RSP]; 113 rs[REG_RIP] = status.pr_reg[REG_RIP]; 114 } else { 115 rs[REG_RBX] = 0; 116 rs[REG_R12] = 0; 117 rs[REG_R13] = 0; 118 rs[REG_R14] = 0; 119 rs[REG_R15] = 0; 120 rs[REG_RBP] = 0; 121 rs[REG_RSP] = 0; 122 rs[REG_RIP] = 0; 123 } 124 } 125 126 void 127 setgregs(ulwp_t *ulwp, gregset_t rs) 128 { 129 lwpstatus_t status; 130 131 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 132 status.pr_reg[REG_RBX] = rs[REG_RBX]; 133 status.pr_reg[REG_R12] = rs[REG_R12]; 134 status.pr_reg[REG_R13] = rs[REG_R13]; 135 status.pr_reg[REG_R14] = rs[REG_R14]; 136 status.pr_reg[REG_R15] = rs[REG_R15]; 137 status.pr_reg[REG_RBP] = rs[REG_RBP]; 138 status.pr_reg[REG_RSP] = rs[REG_RSP]; 139 status.pr_reg[REG_RIP] = rs[REG_RIP]; 140 (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg); 141 } 142 } 143 144 int 145 __csigsetjmp(sigjmp_buf env, int savemask, gregset_t rs) 146 { 147 /* LINTED alignment */ 148 ucontext_t *ucp = (ucontext_t *)env; 149 ulwp_t *self = curthread; 150 151 ucp->uc_link = self->ul_siglink; 152 if (self->ul_ustack.ss_flags & SS_ONSTACK) 153 ucp->uc_stack = self->ul_ustack; 154 else { 155 ucp->uc_stack.ss_sp = 156 (void *)(self->ul_stktop - self->ul_stksiz); 157 ucp->uc_stack.ss_size = self->ul_stksiz; 158 ucp->uc_stack.ss_flags = 0; 159 } 160 ucp->uc_flags = UC_STACK | UC_CPU; 161 if (savemask) { 162 ucp->uc_flags |= UC_SIGMASK; 163 enter_critical(self); 164 ucp->uc_sigmask = self->ul_sigmask; 165 exit_critical(self); 166 } 167 (void) memcpy(ucp->uc_mcontext.gregs, rs, _NGREG * sizeof (greg_t)); 168 169 return (0); 170 } 171