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x86-linux-os.c    231 lines (201 with data), 6.7 kB

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/*
* The x86 Linux incarnation of arch-dependent OS-dependent routines.
* See also "linux-os.c".
*/
/*
* This software is part of the SBCL system. See the README file for
* more information.
*
* This software is derived from the CMU CL system, which was
* written at Carnegie Mellon University and released into the
* public domain. The software is in the public domain and is
* provided with absolutely no warranty. See the COPYING and CREDITS
* files for more information.
*/
#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 "globals.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <signal.h>
/* #include <sys/sysinfo.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
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
* gregs[], but it's conditional on __USE_GNU and not defined, so
* we need to do this nasty absolute index magic number thing
* instead. */
os_context_register_t *
os_context_register_addr(os_context_t *context, int offset)
{
switch(offset) {
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_pc_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[14]; /* REG_EIP */
}
os_context_register_t *
os_context_sp_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[17]; /* REG_UESP */
}
os_context_register_t *
os_context_fp_addr(os_context_t *context)
{
return &context->uc_mcontext.gregs[6]; /* REG_EBP */
}
unsigned long
os_context_fp_control(os_context_t *context)
{
return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) |
(((context->uc_mcontext.fpregs->sw) & 0xffff) << 16));
}
sigset_t *
os_context_sigmask_addr(os_context_t *context)
{
return &context->uc_sigmask;
}
void
os_restore_fp_control(os_context_t *context)
{
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)
{
}