/*
- * The x86 Linux incarnation of arch-dependent OS-dependent routines.
- * See also "linux-os.c".
+ * The x86-64 Linux incarnation of arch-dependent OS-dependent
+ * routines. See also "linux-os.c".
*/
/*
#include <linux/unistd.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
-
-_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount );
+#include "thread.h" /* dynamic_values_bytes */
#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 user_desc 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;
+ pthread_setspecific(specials,thread);
#endif
#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
/* Signal handlers are run on the control stack, so if it is exhausted
sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
sigstack.ss_flags=0;
sigstack.ss_size = 32*SIGSTKSZ;
- sigaltstack(&sigstack,0);
+ 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 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
- };
-
- 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;
}
#define RCASE(name) case reg_ ## name: return &context->uc_mcontext.gregs[REG_ ## name];
switch(offset) {
RCASE(RAX)
- RCASE(RCX)
- RCASE(RDX)
- RCASE(RBX)
- RCASE(RSP)
- RCASE(RBP)
- RCASE(RSI)
- RCASE(RDI)
- RCASE(R8)
- RCASE(R9)
- RCASE(R10)
- RCASE(R11)
- RCASE(R12)
- RCASE(R13)
- RCASE(R14)
- RCASE(R15)
- default:
- if(offset<NGREG)
- return &context->uc_mcontext.gregs[offset/2+4];
- else return 0;
+ RCASE(RCX)
+ RCASE(RDX)
+ RCASE(RBX)
+ RCASE(RSP)
+ RCASE(RBP)
+ RCASE(RSI)
+ RCASE(RDI)
+ RCASE(R8)
+ RCASE(R9)
+ RCASE(R10)
+ RCASE(R11)
+ RCASE(R12)
+ RCASE(R13)
+ RCASE(R14)
+ RCASE(R15)
+ default:
+ if(offset<NGREG)
+ return &context->uc_mcontext.gregs[offset/2+4];
+ else 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[REG_RSP];
}
unsigned long
os_context_fp_control(os_context_t *context)
{
-#if 0
- return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
- (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
-#else
- return 0;
-#endif
+ /* return the x87 exception flags ored in with the sse2
+ * control+status flags */
+ unsigned int result = (context->uc_mcontext.fpregs->swd & 0x3F) | context->uc_mcontext.fpregs->mxcsr;
+ /* flip exception mask bits */
+ return result ^ (0x3F << 7);
}
sigset_t *
void
os_restore_fp_control(os_context_t *context)
{
-#if 0
- asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw));
-#endif
+ /* reset exception flags and restore control flags on SSE2 FPU */
+ unsigned int temp = (context->uc_mcontext.fpregs->mxcsr) & ~0x3F;
+ asm ("ldmxcsr %0" : : "m" (temp));
+ /* same for x87 FPU. */
+ asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cwd));
}
void