1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include "thr_uberdata.h"
#include <procfs.h>
#include <ucontext.h>
#include <setjmp.h>
/*
* The stack needs to be 16-byte aligned with a 4-byte bias. See comment in
* lib/libc/i386/gen/makectxt.c.
*
* Note: If you change it, you need to change it in the following files as
* well:
*
* - lib/libc/i386/gen/makectxt.c
* - lib/common/i386/crti.s
* - lib/common/i386/crt1.s
*/
#undef STACK_ALIGN
#define STACK_ALIGN 16
extern int getlwpstatus(thread_t, lwpstatus_t *);
extern int putlwpregs(thread_t, prgregset_t);
void *
setup_top_frame(void *stk, size_t stksize, ulwp_t *ulwp)
{
uint32_t *stack;
struct {
uint32_t rpc;
uint32_t arg;
uint32_t pad;
uint32_t fp;
uint32_t pc;
} frame;
/*
* Top-of-stack must be rounded down to STACK_ALIGN and
* there must be a minimum frame. Note: 'frame' is not a true
* stack frame (see <sys/frame.h>) but a construction made here to
* make it look like _lwp_start called the thread start function
* with a 16-byte aligned stack pointer (the address of frame.arg
* is the address that muet be aligned on a 16-byte boundary).
*/
stack = (uint32_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1));
/*
* This will return NULL if the kernel cannot allocate
* a page for the top page of the stack. This will cause
* thr_create(), pthread_create() or pthread_attr_setstack()
* to fail, passing the problem up to the application.
*/
stack -= 5; /* make the address of frame.arg be 16-byte aligned */
frame.pc = 0;
frame.fp = 0; /* initial address for %ebp (see EBP below) */
frame.pad = 0;
frame.arg = (uint32_t)ulwp;
frame.rpc = (uint32_t)_lwp_start;
if (uucopy(&frame, (void *)stack, sizeof (frame)) == 0)
return (stack);
return (NULL);
}
int
setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *),
ulwp_t *ulwp, caddr_t stk, size_t stksize)
{
static int initialized;
static greg_t fs, es, ds, cs, ss;
uint32_t *stack;
if (!initialized) {
ucontext_t uc;
/* do this once to load the segment registers */
uc.uc_flags = UC_CPU;
(void) __getcontext(&uc);
fs = uc.uc_mcontext.gregs[FS];
es = uc.uc_mcontext.gregs[ES];
ds = uc.uc_mcontext.gregs[DS];
cs = uc.uc_mcontext.gregs[CS];
ss = uc.uc_mcontext.gregs[SS];
initialized = 1;
}
/* clear the context and set the segment registers */
(void) memset(ucp, 0, sizeof (*ucp));
ucp->uc_mcontext.gregs[FS] = fs;
ucp->uc_mcontext.gregs[ES] = es;
ucp->uc_mcontext.gregs[DS] = ds;
ucp->uc_mcontext.gregs[CS] = cs;
ucp->uc_mcontext.gregs[SS] = ss;
/*
* Yuck.
* Use unused kernel pointer field in ucontext
* to pass down self pointer and set %gs selector
* value so __lwp_create() can setup %gs atomically.
* Without this we would need to block all signals
* and directly call ___lwp_private() in _thrp_setup
* on the other side of __lwp_create().
*/
ucp->uc_mcontext.gregs[ESP] = (greg_t)ulwp;
ucp->uc_mcontext.gregs[GS] = (greg_t)LWPGS_SEL;
/*
* Setup the top stack frame.
* If this fails, pass the problem up to the application.
*/
if ((stack = setup_top_frame(stk, stksize, ulwp)) == NULL)
return (ENOMEM);
/* fill in registers of interest */
ucp->uc_flags |= UC_CPU;
ucp->uc_mcontext.gregs[EIP] = (greg_t)func;
ucp->uc_mcontext.gregs[UESP] = (greg_t)stack;
ucp->uc_mcontext.gregs[EBP] = (greg_t)(stack + 3);
return (0);
}
/*
* Machine-dependent startup code for a newly-created thread.
*/
void *
_thrp_setup(ulwp_t *self)
{
self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz);
self->ul_ustack.ss_size = self->ul_stksiz;
self->ul_ustack.ss_flags = 0;
(void) setustack(&self->ul_ustack);
update_sched(self);
tls_setup();
/* signals have been deferred until now */
sigon(self);
if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled)
return (NULL); /* cancelled by pthread_create() */
return (self->ul_startpc(self->ul_startarg));
}
void
_fpinherit(ulwp_t *ulwp)
{
ulwp->ul_fpuenv.ftag = 0xffffffff;
}
void
getgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
rs[EIP] = status.pr_reg[EIP];
rs[EDI] = status.pr_reg[EDI];
rs[ESI] = status.pr_reg[ESI];
rs[EBP] = status.pr_reg[EBP];
rs[EBX] = status.pr_reg[EBX];
rs[UESP] = status.pr_reg[UESP];
} else {
rs[EIP] = 0;
rs[EDI] = 0;
rs[ESI] = 0;
rs[EBP] = 0;
rs[EBX] = 0;
rs[UESP] = 0;
}
}
void
setgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
status.pr_reg[EIP] = rs[EIP];
status.pr_reg[EDI] = rs[EDI];
status.pr_reg[ESI] = rs[ESI];
status.pr_reg[EBP] = rs[EBP];
status.pr_reg[EBX] = rs[EBX];
status.pr_reg[UESP] = rs[UESP];
(void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
}
}
int
__csigsetjmp(greg_t cs, greg_t ss, greg_t gs,
greg_t fs, greg_t es, greg_t ds,
greg_t edi, greg_t esi, greg_t ebp, greg_t esp,
greg_t ebx, greg_t edx, greg_t ecx, greg_t eax, greg_t eip,
sigjmp_buf env, int savemask)
{
ucontext_t *ucp = (ucontext_t *)env;
ulwp_t *self = curthread;
ucp->uc_link = self->ul_siglink;
if (self->ul_ustack.ss_flags & SS_ONSTACK)
ucp->uc_stack = self->ul_ustack;
else {
ucp->uc_stack.ss_sp =
(void *)(self->ul_stktop - self->ul_stksiz);
ucp->uc_stack.ss_size = self->ul_stksiz;
ucp->uc_stack.ss_flags = 0;
}
ucp->uc_flags = UC_STACK | UC_CPU;
if (savemask) {
ucp->uc_flags |= UC_SIGMASK;
enter_critical(self);
ucp->uc_sigmask = self->ul_sigmask;
exit_critical(self);
}
ucp->uc_mcontext.gregs[GS] = gs;
ucp->uc_mcontext.gregs[FS] = fs;
ucp->uc_mcontext.gregs[ES] = es;
ucp->uc_mcontext.gregs[DS] = ds;
ucp->uc_mcontext.gregs[EDI] = edi;
ucp->uc_mcontext.gregs[ESI] = esi;
ucp->uc_mcontext.gregs[EBP] = ebp;
ucp->uc_mcontext.gregs[ESP] = esp + 4;
ucp->uc_mcontext.gregs[EBX] = ebx;
ucp->uc_mcontext.gregs[EDX] = edx;
ucp->uc_mcontext.gregs[ECX] = ecx;
ucp->uc_mcontext.gregs[EAX] = eax;
ucp->uc_mcontext.gregs[TRAPNO] = 0;
ucp->uc_mcontext.gregs[ERR] = 0;
ucp->uc_mcontext.gregs[EIP] = eip;
ucp->uc_mcontext.gregs[CS] = cs;
ucp->uc_mcontext.gregs[EFL] = 0;
ucp->uc_mcontext.gregs[UESP] = esp + 4;
ucp->uc_mcontext.gregs[SS] = ss;
return (0);
}
void
smt_pause(void)
{
SMT_PAUSE();
}
|
