[93108e]: src / runtime / x86-linux-os.c Maximize Restore History

Download this file

x86-linux-os.c    208 lines (179 with data), 5.7 kB

  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
/*
* The x86 Linux incarnation of arch-dependent OS-dependent routines.
* See also "linux-os.c".
*/
/*
* This software is part of the SBCL system. See the README file for
* more information.
*
* This software is derived from the CMU CL system, which was
* written at Carnegie Mellon University and released into the
* public domain. The software is in the public domain and is
* provided with absolutely no warranty. See the COPYING and CREDITS
* files for more information.
*/
#include <stdio.h>
#include <stddef.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "globals.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
#include "sbcl.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <signal.h>
/* #include <sys/sysinfo.h> */
#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>
#include <asm/ldt.h>
#include <linux/unistd.h>
#include <sys/mman.h>
#include "thread.h" /* dynamic_values_bytes */
_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount );
#include "validate.h"
size_t os_vm_page_size;
u32 local_ldt_copy[LDT_ENTRIES*LDT_ENTRY_SIZE/sizeof(u32)];
/* This is never actually called, but it's great for calling from gdb when
* users have thread-related problems that maintainers can't duplicate */
void debug_get_ldt()
{
int n=modify_ldt (0, local_ldt_copy, sizeof local_ldt_copy);
printf("%d bytes in ldt: print/x local_ldt_copy\n", n);
}
lispobj modify_ldt_lock; /* protect all calls to modify_ldt */
int arch_os_thread_init(struct thread *thread) {
stack_t sigstack;
#ifdef LISP_FEATURE_SB_THREAD
/* this must be called from a function that has an exclusive lock
* on all_threads
*/
struct modify_ldt_ldt_s ldt_entry = {
1, 0, 0, /* index, address, length filled in later */
1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
};
int n;
get_spinlock(&modify_ldt_lock,thread);
n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
/* get next free ldt entry */
if(n) {
u32 *p;
for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
n++;
}
ldt_entry.entry_number=n;
ldt_entry.base_addr=(unsigned long) thread;
ldt_entry.limit=dynamic_values_bytes;
ldt_entry.limit_in_pages=0;
if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
modify_ldt_lock=0;
/* modify_ldt call failed: something magical is not happening */
return -1;
}
__asm__ __volatile__ ("movw %w0, %%fs" : : "q"
((n << 3) /* selector number */
+ (1 << 2) /* TI set = LDT */
+ 3)); /* privilege level */
thread->tls_cookie=n;
modify_ldt_lock=0;
if(n<0) return 0;
#endif
#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
/* Signal handlers are run on the control stack, so if it is exhausted
* we had better use an alternate stack for whatever signal tells us
* we've exhausted it */
sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
sigstack.ss_flags=0;
sigstack.ss_size = 32*SIGSTKSZ;
sigaltstack(&sigstack,0);
#endif
return 1;
}
struct thread *debug_get_fs() {
register u32 fs;
__asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs) : );
return fs;
}
/* free any arch/os-specific resources used by thread, which is now
* defunct. Not called on live threads
*/
int arch_os_thread_cleanup(struct thread *thread) {
struct modify_ldt_ldt_s ldt_entry = {
0, 0, 0,
0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0
};
ldt_entry.entry_number=thread->tls_cookie;
get_spinlock(&modify_ldt_lock,thread);
if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
modify_ldt_lock=0;
/* modify_ldt call failed: something magical is not happening */
return 0;
}
modify_ldt_lock=0;
return 1;
}
/* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
* <sys/ucontext.h> file to define symbolic names for offsets into
* gregs[], but it's conditional on __USE_GNU and not defined, so
* we need to do this nasty absolute index magic number thing
* instead. */
os_context_register_t *
os_context_register_addr(os_context_t *context, int offset)
{
switch(offset) {
case reg_EAX: return &context->uc_mcontext.gregs[11];
case reg_ECX: return &context->uc_mcontext.gregs[10];
case reg_EDX: return &context->uc_mcontext.gregs[9];
case reg_EBX: return &context->uc_mcontext.gregs[8];
case reg_ESP: return &context->uc_mcontext.gregs[7];
case reg_EBP: return &context->uc_mcontext.gregs[6];
case reg_ESI: return &context->uc_mcontext.gregs[5];
case reg_EDI: return &context->uc_mcontext.gregs[4];
default: return 0;
}
return &context->uc_mcontext.gregs[offset];
}
os_context_register_t *
os_context_pc_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[14]; /* REG_EIP */
}
os_context_register_t *
os_context_sp_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[17]; /* REG_UESP */
}
os_context_register_t *
os_context_fp_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[6]; /* REG_EBP */
}
unsigned long
os_context_fp_control(os_context_t *context)
{
return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
(((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
}
sigset_t *
os_context_sigmask_addr(os_context_t *context)
{
return &context->uc_sigmask;
}
void
os_restore_fp_control(os_context_t *context)
{
asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
}
void
os_flush_icache(os_vm_address_t address, os_vm_size_t length)
{
}