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0.pre8.86:
[sbcl.git]
/
src
/
runtime
/
x86-linux-os.c
diff --git
a/src/runtime/x86-linux-os.c
b/src/runtime/x86-linux-os.c
index
140f0fd
..
9b46107
100644
(file)
--- a/
src/runtime/x86-linux-os.c
+++ b/
src/runtime/x86-linux-os.c
@@
-60,6
+60,8
@@
void debug_get_ldt()
printf("%d bytes in ldt: print/x local_ldt_copy\n", n);
}
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
int arch_os_thread_init(struct thread *thread) {
stack_t sigstack;
#ifdef LISP_FEATURE_SB_THREAD
@@
-70,8
+72,11
@@
int arch_os_thread_init(struct thread *thread) {
1, 0, 0, /* index, address, length filled in later */
1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
};
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 */
/* get next free ldt entry */
- int n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy);
+
if(n) {
u32 *p;
for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
if(n) {
u32 *p;
for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32))
@@
-81,14
+86,18
@@
int arch_os_thread_init(struct thread *thread) {
ldt_entry.base_addr=(unsigned long) thread;
ldt_entry.limit=dynamic_values_bytes;
ldt_entry.limit_in_pages=0;
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)
+ 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;
/* 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;
__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
if(n<0) return 0;
#endif
#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
@@
-130,9
+139,13
@@
int arch_os_thread_cleanup(struct thread *thread) {
};
ldt_entry.entry_number=thread->tls_cookie;
};
ldt_entry.entry_number=thread->tls_cookie;
- if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0)
+ 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 call failed: something magical is not happening */
return 0;
+ }
+ modify_ldt_lock=0;
return 1;
}
return 1;
}