*/
#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 "sbcl.h"
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
-#include "sbcl.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <asm/ldt.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+#include <linux/version.h>
+#include "thread.h" /* dynamic_values_bytes */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+#define user_desc modify_ldt_ldt_s
+#endif
+
+#define modify_ldt sbcl_modify_ldt
+static inline int modify_ldt (int func, void *ptr, unsigned long bytecount)
+{
+ return syscall (SYS_modify_ldt, func, ptr, 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);
+}
+
+#ifdef LISP_FEATURE_SB_THREAD
+pthread_mutex_t modify_ldt_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
+int arch_os_thread_init(struct thread *thread) {
+ stack_t sigstack;
+#ifdef LISP_FEATURE_SB_THREAD
+ struct user_desc ldt_entry = {
+ 1, 0, 0, /* index, address, length filled in later */
+ 1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1
+ };
+ int n;
+ thread_mutex_lock(&modify_ldt_lock);
+ 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) {
+ thread_mutex_unlock(&modify_ldt_lock);
+ /* modify_ldt call failed: something magical is not happening */
+ return 0;
+ }
+ __asm__ __volatile__ ("movw %w0, %%fs" : : "q"
+ ((n << 3) /* selector number */
+ + (1 << 2) /* TI set = LDT */
+ + 3)); /* privilege level */
+ thread->tls_cookie=n;
+ pthread_mutex_unlock(&modify_ldt_lock);
+
+ /* now %fs:0 refers to the current thread. Useful! Less usefully,
+ * Linux/x86 isn't capable of reporting a faulting si_addr on a
+ * segment as defined above (whereas faults on the segment that %gs
+ * usually points are reported just fine...). As a special
+ * workaround, we store each thread structure's absolute address as
+ * as slot in itself, so that within the thread,
+ * movl %fs:SELFPTR_OFFSET,x
+ * stores the absolute address of %fs:0 into x.
+ */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ thread->selfptr = thread;
+#endif
+
+ if(n<0) return 0;
+#ifdef LISP_FEATURE_GCC_TLS
+ current_thread = thread;
+#else
+ pthread_setspecific(specials,thread);
+#endif
+#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;
+ if(sigaltstack(&sigstack,0)<0)
+ lose("Cannot sigaltstack: %s\n",strerror(errno));
+#endif
+ return 1;
+}
+
+struct thread *debug_get_fs() {
+ register u32 fs;
+ __asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs) : );
+ return (struct thread *)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 user_desc ldt_entry = {
+ 0, 0, 0,
+ 0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0
+ };
+ int result;
+
+ ldt_entry.entry_number=thread->tls_cookie;
+ thread_mutex_lock(&modify_ldt_lock);
+ result = modify_ldt(1, &ldt_entry, sizeof (ldt_entry));
+ thread_mutex_unlock(&modify_ldt_lock);
+ return result;
+}
+
+
/* 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
os_context_register_addr(os_context_t *context, int offset)
{
switch(offset) {
- case 0: return &context->uc_mcontext.gregs[11]; /* EAX */
- case 2: return &context->uc_mcontext.gregs[10]; /* ECX */
- case 4: return &context->uc_mcontext.gregs[9]; /* EDX */
- case 6: return &context->uc_mcontext.gregs[8]; /* EBX */
- case 8: return &context->uc_mcontext.gregs[7]; /* ESP */
- case 10: return &context->uc_mcontext.gregs[6]; /* EBP */
- case 12: return &context->uc_mcontext.gregs[5]; /* ESI */
- case 14: return &context->uc_mcontext.gregs[4]; /* EDI */
+ 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_sp_addr(os_context_t *context)
-{
+{
return &context->uc_mcontext.gregs[17]; /* REG_UESP */
}
os_context_fp_control(os_context_t *context)
{
return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
- (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
+ (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
}
sigset_t *
void
os_restore_fp_control(os_context_t *context)
{
- asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
+ if (context->uc_mcontext.fpregs)
+ asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
}
void
os_flush_icache(os_vm_address_t address, os_vm_size_t length)
{
}
-
projects / sbcl.git / blobdiff