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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include "lint.h" 29 #include "thr_uberdata.h" 30 #include <procfs.h> 31 #include <ucontext.h> 32 #include <setjmp.h> 33 34 extern int getlwpstatus(thread_t, lwpstatus_t *); 35 extern int putlwpregs(thread_t, prgregset_t); 36 37 int 38 setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *), 39 ulwp_t *ulwp, caddr_t stk, size_t stksize) 40 { 41 uint64_t *stack; 42 43 /* clear the context */ 44 (void) _memset(ucp, 0, sizeof (*ucp)); 45 46 /* setup to store the current thread pointer in %fs */ 47 ucp->uc_mcontext.gregs[REG_FSBASE] = (greg_t)ulwp; 48 ucp->uc_mcontext.gregs[REG_FS] = 0; /* null selector indicates fsbase */ 49 50 /* all contexts should have a valid data segment descriptor for %ss */ 51 ucp->uc_mcontext.gregs[REG_SS] = UDS_SEL; 52 53 /* top-of-stack must be rounded down to STACK_ALIGN */ 54 stack = (uint64_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1)); 55 56 /* set up top stack frame */ 57 *--stack = 0; 58 *--stack = 0; 59 *--stack = (uint64_t)_lwp_start; 60 61 /* fill in registers of interest */ 62 ucp->uc_flags |= UC_CPU; 63 ucp->uc_mcontext.gregs[REG_RDI] = (greg_t)ulwp; 64 ucp->uc_mcontext.gregs[REG_RIP] = (greg_t)func; 65 ucp->uc_mcontext.gregs[REG_RSP] = (greg_t)stack; 66 ucp->uc_mcontext.gregs[REG_RBP] = (greg_t)(stack+1); 67 68 return (0); 69 } 70 71 /* 72 * Machine-dependent startup code for a newly-created thread. 73 */ 74 void * 75 _thr_setup(ulwp_t *self) 76 { 77 self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz); 78 self->ul_ustack.ss_size = self->ul_stksiz; 79 self->ul_ustack.ss_flags = 0; 80 (void) _private_setustack(&self->ul_ustack); 81 tls_setup(); 82 83 /* signals have been deferred until now */ 84 sigon(self); 85 86 return (self->ul_startpc(self->ul_startarg)); 87 } 88 89 void 90 _fpinherit(ulwp_t *ulwp) 91 { 92 ulwp->ul_fpuenv.ftag = 0xffffffff; 93 } 94 95 void 96 getgregs(ulwp_t *ulwp, gregset_t rs) 97 { 98 lwpstatus_t status; 99 100 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 101 rs[REG_RBX] = status.pr_reg[REG_RBX]; 102 rs[REG_R12] = status.pr_reg[REG_R12]; 103 rs[REG_R13] = status.pr_reg[REG_R13]; 104 rs[REG_R14] = status.pr_reg[REG_R14]; 105 rs[REG_R15] = status.pr_reg[REG_R15]; 106 rs[REG_RBP] = status.pr_reg[REG_RBP]; 107 rs[REG_RSP] = status.pr_reg[REG_RSP]; 108 rs[REG_RIP] = status.pr_reg[REG_RIP]; 109 } else { 110 rs[REG_RBX] = 0; 111 rs[REG_R12] = 0; 112 rs[REG_R13] = 0; 113 rs[REG_R14] = 0; 114 rs[REG_R15] = 0; 115 rs[REG_RBP] = 0; 116 rs[REG_RSP] = 0; 117 rs[REG_RIP] = 0; 118 } 119 } 120 121 void 122 setgregs(ulwp_t *ulwp, gregset_t rs) 123 { 124 lwpstatus_t status; 125 126 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 127 status.pr_reg[REG_RBX] = rs[REG_RBX]; 128 status.pr_reg[REG_R12] = rs[REG_R12]; 129 status.pr_reg[REG_R13] = rs[REG_R13]; 130 status.pr_reg[REG_R14] = rs[REG_R14]; 131 status.pr_reg[REG_R15] = rs[REG_R15]; 132 status.pr_reg[REG_RBP] = rs[REG_RBP]; 133 status.pr_reg[REG_RSP] = rs[REG_RSP]; 134 status.pr_reg[REG_RIP] = rs[REG_RIP]; 135 (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg); 136 } 137 } 138 139 int 140 __csigsetjmp(sigjmp_buf env, int savemask, gregset_t rs) 141 { 142 /* LINTED alignment */ 143 ucontext_t *ucp = (ucontext_t *)env; 144 ulwp_t *self = curthread; 145 146 ucp->uc_link = self->ul_siglink; 147 if (self->ul_ustack.ss_flags & SS_ONSTACK) 148 ucp->uc_stack = self->ul_ustack; 149 else { 150 ucp->uc_stack.ss_sp = 151 (void *)(self->ul_stktop - self->ul_stksiz); 152 ucp->uc_stack.ss_size = self->ul_stksiz; 153 ucp->uc_stack.ss_flags = 0; 154 } 155 ucp->uc_flags = UC_STACK | UC_CPU; 156 if (savemask) { 157 ucp->uc_flags |= UC_SIGMASK; 158 enter_critical(self); 159 ucp->uc_sigmask = self->ul_sigmask; 160 exit_critical(self); 161 } 162 (void) _memcpy(ucp->uc_mcontext.gregs, rs, _NGREG * sizeof (greg_t)); 163 164 return (0); 165 } 166