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 *
setup_top_frame(void * stk,size_t stksize,ulwp_t * ulwp)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
setup_context(ucontext_t * ucp,void * (* func)(ulwp_t *),ulwp_t * ulwp,caddr_t stk,size_t stksize)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 stack = (uintptr_t)setup_top_frame(stk, stksize, ulwp);
76 if (stack == (uintptr_t)NULL)
77 return (ENOMEM);
78
79 /* fill in registers of interest */
80 ucp->uc_flags |= UC_CPU;
81 ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func;
82 ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4;
83 ucp->uc_mcontext.gregs[REG_O0] = (greg_t)ulwp;
84 ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS);
85 ucp->uc_mcontext.gregs[REG_O7] = (greg_t)_lwp_start;
86 ucp->uc_mcontext.gregs[REG_G7] = (greg_t)ulwp;
87
88 return (0);
89 }
90
91 /*
92 * Machine-dependent startup code for a newly-created thread.
93 */
94 void *
_thrp_setup(ulwp_t * self)95 _thrp_setup(ulwp_t *self)
96 {
97 extern void _setfsr(greg_t *);
98
99 if (self->ul_fpuenv.fpu_en)
100 _setfsr(&self->ul_fpuenv.fsr);
101
102 self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz);
103 self->ul_ustack.ss_size = self->ul_stksiz;
104 self->ul_ustack.ss_flags = 0;
105 (void) setustack(&self->ul_ustack);
106
107 update_sched(self);
108 tls_setup();
109
110 /* signals have been deferred until now */
111 sigon(self);
112
113 if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled)
114 return (NULL); /* cancelled by pthread_create() */
115 return (self->ul_startpc(self->ul_startarg));
116 }
117
118 void
_fpinherit(ulwp_t * ulwp)119 _fpinherit(ulwp_t *ulwp)
120 {
121 extern void _getfsr(greg_t *);
122 int fpu_enabled;
123
124 #ifdef __sparcv9
125 extern greg_t _getfprs();
126 fpu_enabled = _getfprs() & FPRS_FEF;
127 #else
128 extern psw_t _getpsr();
129 fpu_enabled = _getpsr() & PSR_EF;
130 #endif /* __sparcv9 */
131
132 if (fpu_enabled) {
133 _getfsr(&ulwp->ul_fpuenv.fsr);
134 ulwp->ul_fpuenv.fpu_en = 1;
135 } else {
136 ulwp->ul_fpuenv.fpu_en = 0;
137 }
138 }
139
140 void
getgregs(ulwp_t * ulwp,gregset_t rs)141 getgregs(ulwp_t *ulwp, gregset_t rs)
142 {
143 lwpstatus_t status;
144
145 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
146 rs[REG_PC] = status.pr_reg[R_PC];
147 rs[REG_O6] = status.pr_reg[R_O6];
148 rs[REG_O7] = status.pr_reg[R_O7];
149 rs[REG_G1] = status.pr_reg[R_G1];
150 rs[REG_G2] = status.pr_reg[R_G2];
151 rs[REG_G3] = status.pr_reg[R_G3];
152 rs[REG_G4] = status.pr_reg[R_G4];
153 } else {
154 rs[REG_PC] = 0;
155 rs[REG_O6] = 0;
156 rs[REG_O7] = 0;
157 rs[REG_G1] = 0;
158 rs[REG_G2] = 0;
159 rs[REG_G3] = 0;
160 rs[REG_G4] = 0;
161 }
162 }
163
164 void
setgregs(ulwp_t * ulwp,gregset_t rs)165 setgregs(ulwp_t *ulwp, gregset_t rs)
166 {
167 lwpstatus_t status;
168
169 if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
170 status.pr_reg[R_PC] = rs[REG_PC];
171 status.pr_reg[R_O6] = rs[REG_O6];
172 status.pr_reg[R_O7] = rs[REG_O7];
173 status.pr_reg[R_G1] = rs[REG_G1];
174 status.pr_reg[R_G2] = rs[REG_G2];
175 status.pr_reg[R_G3] = rs[REG_G3];
176 status.pr_reg[R_G4] = rs[REG_G4];
177 (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
178 }
179 }
180
181 int
__csigsetjmp(sigjmp_buf env,int savemask)182 __csigsetjmp(sigjmp_buf env, int savemask)
183 {
184 sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
185 ulwp_t *self = curthread;
186
187 /*
188 * bp->sjs_sp, bp->sjs_pc, bp->sjs_fp and bp->sjs_i7 are already set.
189 * Also, if we are running in 64-bit mode (__sparcv9),
190 * then bp->sjs_asi and bp->sjs_fprs are already set.
191 */
192 bp->sjs_flags = JB_FRAMEPTR;
193 bp->sjs_uclink = self->ul_siglink;
194 if (self->ul_ustack.ss_flags & SS_ONSTACK)
195 bp->sjs_stack = self->ul_ustack;
196 else {
197 bp->sjs_stack.ss_sp =
198 (void *)(self->ul_stktop - self->ul_stksiz);
199 bp->sjs_stack.ss_size = self->ul_stksiz;
200 bp->sjs_stack.ss_flags = 0;
201 }
202 if (savemask) {
203 bp->sjs_flags |= JB_SAVEMASK;
204 enter_critical(self);
205 bp->sjs_sigmask = self->ul_sigmask;
206 exit_critical(self);
207 }
208
209 return (0);
210 }
211