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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 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 ulwp->ul_gs = LWPFS_SEL; 50 ucp->uc_mcontext.gregs[REG_FS] = (greg_t)ulwp->ul_gs; 51 52 /* all contexts should have a valid data segment descriptor for %ss */ 53 ucp->uc_mcontext.gregs[REG_SS] = UDS_SEL; 54 55 /* top-of-stack must be rounded down to STACK_ALIGN */ 56 stack = (uint64_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1)); 57 58 /* set up top stack frame */ 59 *--stack = 0; 60 *--stack = 0; 61 *--stack = (uint64_t)_lwp_start; 62 63 /* fill in registers of interest */ 64 ucp->uc_flags |= UC_CPU; 65 ucp->uc_mcontext.gregs[REG_RDI] = (greg_t)ulwp; 66 ucp->uc_mcontext.gregs[REG_RIP] = (greg_t)func; 67 ucp->uc_mcontext.gregs[REG_RSP] = (greg_t)stack; 68 ucp->uc_mcontext.gregs[REG_RBP] = (greg_t)(stack+1); 69 70 return (0); 71 } 72 73 /* 74 * Machine-dependent startup code for a newly-created thread. 75 */ 76 void * 77 _thr_setup(ulwp_t *self) 78 { 79 self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz); 80 self->ul_ustack.ss_size = self->ul_stksiz; 81 self->ul_ustack.ss_flags = 0; 82 (void) _private_setustack(&self->ul_ustack); 83 tls_setup(); 84 85 /* signals have been deferred until now */ 86 sigon(self); 87 88 return (self->ul_startpc(self->ul_startarg)); 89 } 90 91 void 92 _fpinherit(ulwp_t *ulwp) 93 { 94 ulwp->ul_fpuenv.ftag = 0xffffffff; 95 } 96 97 void 98 getgregs(ulwp_t *ulwp, gregset_t rs) 99 { 100 lwpstatus_t status; 101 102 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 103 rs[REG_RBX] = status.pr_reg[REG_RBX]; 104 rs[REG_R12] = status.pr_reg[REG_R12]; 105 rs[REG_R13] = status.pr_reg[REG_R13]; 106 rs[REG_R14] = status.pr_reg[REG_R14]; 107 rs[REG_R15] = status.pr_reg[REG_R15]; 108 rs[REG_RBP] = status.pr_reg[REG_RBP]; 109 rs[REG_RSP] = status.pr_reg[REG_RSP]; 110 rs[REG_RIP] = status.pr_reg[REG_RIP]; 111 } else { 112 rs[REG_RBX] = 0; 113 rs[REG_R12] = 0; 114 rs[REG_R13] = 0; 115 rs[REG_R14] = 0; 116 rs[REG_R15] = 0; 117 rs[REG_RBP] = 0; 118 rs[REG_RSP] = 0; 119 rs[REG_RIP] = 0; 120 } 121 } 122 123 void 124 setgregs(ulwp_t *ulwp, gregset_t rs) 125 { 126 lwpstatus_t status; 127 128 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) { 129 status.pr_reg[REG_RBX] = rs[REG_RBX]; 130 status.pr_reg[REG_R12] = rs[REG_R12]; 131 status.pr_reg[REG_R13] = rs[REG_R13]; 132 status.pr_reg[REG_R14] = rs[REG_R14]; 133 status.pr_reg[REG_R15] = rs[REG_R15]; 134 status.pr_reg[REG_RBP] = rs[REG_RBP]; 135 status.pr_reg[REG_RSP] = rs[REG_RSP]; 136 status.pr_reg[REG_RIP] = rs[REG_RIP]; 137 (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg); 138 } 139 } 140 141 int 142 __csigsetjmp(sigjmp_buf env, int savemask, gregset_t rs) 143 { 144 /* LINTED alignment */ 145 ucontext_t *ucp = (ucontext_t *)env; 146 ulwp_t *self = curthread; 147 148 ucp->uc_link = self->ul_siglink; 149 if (self->ul_ustack.ss_flags & SS_ONSTACK) 150 ucp->uc_stack = self->ul_ustack; 151 else { 152 ucp->uc_stack.ss_sp = 153 (void *)(self->ul_stktop - self->ul_stksiz); 154 ucp->uc_stack.ss_size = self->ul_stksiz; 155 ucp->uc_stack.ss_flags = 0; 156 } 157 ucp->uc_flags = UC_STACK | UC_CPU; 158 if (savemask) { 159 ucp->uc_flags |= UC_SIGMASK; 160 enter_critical(self); 161 ucp->uc_sigmask = self->ul_sigmask; 162 exit_critical(self); 163 } 164 (void) _memcpy(ucp->uc_mcontext.gregs, rs, _NGREG * sizeof (greg_t)); 165 166 return (0); 167 } 168