1.0.18.13: adjust address-spaces for Windows 32
[sbcl/tcr.git] / src / runtime / x86-linux-os.c
blobc15665d1c41df58143ce8dd42509eea16d7c8024
1 /*
2 * The x86 Linux incarnation of arch-dependent OS-dependent routines.
3 * See also "linux-os.c".
4 */
6 /*
7 * This software is part of the SBCL system. See the README file for
8 * more information.
10 * This software is derived from the CMU CL system, which was
11 * written at Carnegie Mellon University and released into the
12 * public domain. The software is in the public domain and is
13 * provided with absolutely no warranty. See the COPYING and CREDITS
14 * files for more information.
17 #include <stdio.h>
18 #include <stddef.h>
19 #include <sys/param.h>
20 #include <sys/file.h>
21 #include <sys/types.h>
22 #include <unistd.h>
23 #include <errno.h>
25 #include "sbcl.h"
26 #include "./signal.h"
27 #include "os.h"
28 #include "arch.h"
29 #include "globals.h"
30 #include "interrupt.h"
31 #include "interr.h"
32 #include "lispregs.h"
33 #include <sys/socket.h>
34 #include <sys/utsname.h>
36 #include <sys/types.h>
37 #include <signal.h>
38 /* #include <sys/sysinfo.h> */
39 #include <sys/time.h>
40 #include <sys/stat.h>
41 #include <unistd.h>
42 #include <asm/ldt.h>
43 #include <sys/syscall.h>
44 #include <sys/mman.h>
45 #include <linux/version.h>
46 #include "thread.h" /* dynamic_values_bytes */
48 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
49 #define user_desc modify_ldt_ldt_s
50 #endif
52 #define modify_ldt sbcl_modify_ldt
53 static inline int modify_ldt (int func, void *ptr, unsigned long bytecount)
55 return syscall (SYS_modify_ldt, func, ptr, bytecount);
58 #include "validate.h"
59 size_t os_vm_page_size;
61 u32 local_ldt_copy[LDT_ENTRIES*LDT_ENTRY_SIZE/sizeof(u32)];
63 /* This is never actually called, but it's great for calling from gdb when
64 * users have thread-related problems that maintainers can't duplicate */
66 void debug_get_ldt()
68 int n=modify_ldt (0, local_ldt_copy, sizeof local_ldt_copy);
69 printf("%d bytes in ldt: print/x local_ldt_copy\n", n);
72 #ifdef LISP_FEATURE_SB_THREAD
73 pthread_mutex_t modify_ldt_lock = PTHREAD_MUTEX_INITIALIZER;
74 #endif
76 int arch_os_thread_init(struct thread *thread) {
77 stack_t sigstack;
78 #ifdef LISP_FEATURE_SB_THREAD
79 struct user_desc ldt_entry = {
80 1, 0, 0, /* index, address, length filled in later */
81 1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
83 int n;
84 thread_mutex_lock(&modify_ldt_lock);
85 n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
86 /* get next free ldt entry */
88 if(n) {
89 u32 *p;
90 for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
91 n++;
93 ldt_entry.entry_number=n;
94 ldt_entry.base_addr=(unsigned long) thread;
95 ldt_entry.limit=dynamic_values_bytes;
96 ldt_entry.limit_in_pages=0;
97 if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
98 thread_mutex_unlock(&modify_ldt_lock);
99 /* modify_ldt call failed: something magical is not happening */
100 return 0;
102 __asm__ __volatile__ ("movw %w0, %%fs" : : "q"
103 ((n << 3) /* selector number */
104 + (1 << 2) /* TI set = LDT */
105 + 3)); /* privilege level */
106 thread->tls_cookie=n;
107 pthread_mutex_unlock(&modify_ldt_lock);
109 if(n<0) return 0;
110 #ifdef LISP_FEATURE_GCC_TLS
111 current_thread = thread;
112 #else
113 pthread_setspecific(specials,thread);
114 #endif
115 #endif
116 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
117 /* Signal handlers are run on the control stack, so if it is exhausted
118 * we had better use an alternate stack for whatever signal tells us
119 * we've exhausted it */
120 sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
121 sigstack.ss_flags=0;
122 sigstack.ss_size = 32*SIGSTKSZ;
123 if(sigaltstack(&sigstack,0)<0)
124 lose("Cannot sigaltstack: %s\n",strerror(errno));
125 #endif
126 return 1;
129 struct thread *debug_get_fs() {
130 register u32 fs;
131 __asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs) : );
132 return (struct thread *)fs;
135 /* free any arch/os-specific resources used by thread, which is now
136 * defunct. Not called on live threads
139 int arch_os_thread_cleanup(struct thread *thread) {
140 struct user_desc ldt_entry = {
141 0, 0, 0,
142 0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0
144 int result;
146 ldt_entry.entry_number=thread->tls_cookie;
147 thread_mutex_lock(&modify_ldt_lock);
148 result = modify_ldt(1, &ldt_entry, sizeof (ldt_entry));
149 thread_mutex_unlock(&modify_ldt_lock);
150 return result;
155 /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
156 * <sys/ucontext.h> file to define symbolic names for offsets into
157 * gregs[], but it's conditional on __USE_GNU and not defined, so
158 * we need to do this nasty absolute index magic number thing
159 * instead. */
160 os_context_register_t *
161 os_context_register_addr(os_context_t *context, int offset)
163 switch(offset) {
164 case reg_EAX: return &context->uc_mcontext.gregs[11];
165 case reg_ECX: return &context->uc_mcontext.gregs[10];
166 case reg_EDX: return &context->uc_mcontext.gregs[9];
167 case reg_EBX: return &context->uc_mcontext.gregs[8];
168 case reg_ESP: return &context->uc_mcontext.gregs[7];
169 case reg_EBP: return &context->uc_mcontext.gregs[6];
170 case reg_ESI: return &context->uc_mcontext.gregs[5];
171 case reg_EDI: return &context->uc_mcontext.gregs[4];
172 default: return 0;
174 return &context->uc_mcontext.gregs[offset];
177 os_context_register_t *
178 os_context_pc_addr(os_context_t *context)
180 return &context->uc_mcontext.gregs[14]; /* REG_EIP */
183 os_context_register_t *
184 os_context_sp_addr(os_context_t *context)
186 return &context->uc_mcontext.gregs[17]; /* REG_UESP */
189 os_context_register_t *
190 os_context_fp_addr(os_context_t *context)
192 return &context->uc_mcontext.gregs[6]; /* REG_EBP */
195 unsigned long
196 os_context_fp_control(os_context_t *context)
198 return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
199 (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
202 sigset_t *
203 os_context_sigmask_addr(os_context_t *context)
205 return &context->uc_sigmask;
208 void
209 os_restore_fp_control(os_context_t *context)
211 asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
214 void
215 os_flush_icache(os_vm_address_t address, os_vm_size_t length)