2 * The x86 Linux incarnation of arch-dependent OS-dependent routines.
3 * See also "linux-os.c".
7 * This software is part of the SBCL system. See the README file for
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.
19 #include <sys/param.h>
21 #include <sys/types.h>
30 #include "interrupt.h"
33 #include <sys/socket.h>
34 #include <sys/utsname.h>
36 #include <sys/types.h>
38 /* #include <sys/sysinfo.h> */
43 #include <sys/syscall.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
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);
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 */
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;
76 int arch_os_thread_init(struct thread *thread) {
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
84 check_blockables_blocked_or_lose();
85 thread_mutex_lock(&modify_ldt_lock);
86 n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
87 /* get next free ldt entry */
91 for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
94 ldt_entry.entry_number=n;
95 ldt_entry.base_addr=(unsigned long) thread;
96 ldt_entry.limit=dynamic_values_bytes;
97 ldt_entry.limit_in_pages=0;
98 if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) {
99 thread_mutex_unlock(&modify_ldt_lock);
100 /* modify_ldt call failed: something magical is not happening */
103 __asm__ __volatile__ ("movw %w0, %%fs" : : "q"
104 ((n << 3) /* selector number */
105 + (1 << 2) /* TI set = LDT */
106 + 3)); /* privilege level */
107 thread->tls_cookie=n;
108 pthread_mutex_unlock(&modify_ldt_lock);
111 pthread_setspecific(specials,thread);
113 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
114 /* Signal handlers are run on the control stack, so if it is exhausted
115 * we had better use an alternate stack for whatever signal tells us
116 * we've exhausted it */
117 sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
119 sigstack.ss_size = 32*SIGSTKSZ;
120 if(sigaltstack(&sigstack,0)<0)
121 lose("Cannot sigaltstack: %s\n",strerror(errno));
126 struct thread *debug_get_fs() {
128 __asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs) : );
129 return (struct thread *)fs;
132 /* free any arch/os-specific resources used by thread, which is now
133 * defunct. Not called on live threads
136 int arch_os_thread_cleanup(struct thread *thread) {
137 struct user_desc ldt_entry = {
139 0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0
143 check_blockables_blocked_or_lose();
144 ldt_entry.entry_number=thread->tls_cookie;
145 thread_mutex_lock(&modify_ldt_lock);
146 result = modify_ldt(1, &ldt_entry, sizeof (ldt_entry));
147 thread_mutex_unlock(&modify_ldt_lock);
153 /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the
154 * <sys/ucontext.h> file to define symbolic names for offsets into
155 * gregs[], but it's conditional on __USE_GNU and not defined, so
156 * we need to do this nasty absolute index magic number thing
158 os_context_register_t *
159 os_context_register_addr(os_context_t *context, int offset)
162 case reg_EAX: return &context->uc_mcontext.gregs[11];
163 case reg_ECX: return &context->uc_mcontext.gregs[10];
164 case reg_EDX: return &context->uc_mcontext.gregs[9];
165 case reg_EBX: return &context->uc_mcontext.gregs[8];
166 case reg_ESP: return &context->uc_mcontext.gregs[7];
167 case reg_EBP: return &context->uc_mcontext.gregs[6];
168 case reg_ESI: return &context->uc_mcontext.gregs[5];
169 case reg_EDI: return &context->uc_mcontext.gregs[4];
172 return &context->uc_mcontext.gregs[offset];
175 os_context_register_t *
176 os_context_pc_addr(os_context_t *context)
178 return &context->uc_mcontext.gregs[14]; /* REG_EIP */
181 os_context_register_t *
182 os_context_sp_addr(os_context_t *context)
184 return &context->uc_mcontext.gregs[17]; /* REG_UESP */
187 os_context_register_t *
188 os_context_fp_addr(os_context_t *context)
190 return &context->uc_mcontext.gregs[6]; /* REG_EBP */
194 os_context_fp_control(os_context_t *context)
196 return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
197 (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
201 os_context_sigmask_addr(os_context_t *context)
203 return &context->uc_sigmask;
207 os_restore_fp_control(os_context_t *context)
209 asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
213 os_flush_icache(os_vm_address_t address, os_vm_size_t length)