newlib/winsup/cygwin/cygtls.h

358 lines
7.9 KiB
C++

/* cygtls.h
Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
Red Hat, Inc.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#pragma once
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
#define _NOMNTENT_FUNCS
#include <mntent.h>
#undef _NOMNTENT_FUNCS
#include <setjmp.h>
#define CYGTLS_INITIALIZED 0xc763173f
#ifndef CYG_MAX_PATH
# define CYG_MAX_PATH 260
#endif
#ifndef UNLEN
# define UNLEN 256
#endif
#define TLS_STACK_SIZE 256
#include "cygthread.h"
#define TP_NUM_C_BUFS 10
#define TP_NUM_W_BUFS 10
#ifdef CYGTLS_HANDLE
#include "thread.h"
#endif
#ifdef __x86_64__
#pragma pack(push,8)
#else
#pragma pack(push,4)
#endif
/* Defined here to support auto rebuild of tlsoffsets.h. */
class tls_pathbuf
{
int c_cnt;
int w_cnt;
char *c_buf[TP_NUM_C_BUFS];
WCHAR *w_buf[TP_NUM_W_BUFS];
public:
void destroy ();
friend class tmp_pathbuf;
friend class _cygtls;
friend class san;
};
class unionent
{
public:
char *name;
char **list;
short port_proto_addrtype;
short h_len;
union
{
char *s_proto;
char **h_addr_list;
};
enum struct_type
{
t_hostent, t_protoent, t_servent
};
};
struct _local_storage
{
/*
Needed for the group functions
*/
int grp_pos;
/* dlfcn.cc */
int dl_error;
char dl_buffer[256];
/* passwd.cc */
struct passwd res;
char pass[_PASSWORD_LEN];
int pw_pos;
/* path.cc */
struct mntent mntbuf;
int iteration;
unsigned available_drives;
char mnt_type[80];
char mnt_opts[80];
char mnt_fsname[CYG_MAX_PATH];
char mnt_dir[CYG_MAX_PATH];
/* select.cc */
struct {
HANDLE sockevt;
int max_w4;
LONG *ser_num; // note: malloced
HANDLE *w4; // note: malloced
} select;
/* strerror errno.cc */
char strerror_buf[sizeof ("Unknown error -2147483648")];
char strerror_r_buf[sizeof ("Unknown error -2147483648")];
/* times.cc */
char timezone_buf[20];
/* strsig.cc */
char signamebuf[sizeof ("Unknown signal 4294967295 ")];
/* net.cc */
char *ntoa_buf; // note: malloced
unionent *hostent_buf; // note: malloced
unionent *protoent_buf; // note: malloced
unionent *servent_buf; // note: malloced
/* cygthread.cc */
char unknown_thread_name[30];
/* syscalls.cc */
int setmode_file;
int setmode_mode;
/* thread.cc */
HANDLE cw_timer;
/* All functions requiring temporary path buffers. */
tls_pathbuf pathbufs;
char ttybuf[32];
};
typedef struct struct_waitq
{
int pid;
int options;
int status;
HANDLE ev;
void *rusage; /* pointer to potential rusage */
struct struct_waitq *next;
HANDLE thread_ev;
} waitq;
/* Changes to the below structure may require acompanying changes to the very
simple parser in the perl script 'gentls_offsets' (<<-- start parsing here).
The union in this structure is used to force alignment between the version
of the compiler used to generate tlsoffsets.h and the cygwin cross compiler.
*/
/*gentls_offsets*/
extern "C" int __sjfault (jmp_buf);
extern "C" int __ljfault (jmp_buf, int);
/*gentls_offsets*/
typedef uintptr_t __stack_t;
class _cygtls
{
public:
/* Please keep these two declarations first */
struct _local_storage locals;
union
{
struct _reent local_clib;
char __dontuse[8 * ((sizeof(struct _reent) + 4) / 8)];
};
/**/
void (*func) /*gentls_offsets*/(int, siginfo_t *, void *)/*gentls_offsets*/;
int saved_errno;
int sa_flags;
sigset_t oldmask;
sigset_t deltamask;
int *errno_addr;
sigset_t sigmask;
sigset_t sigwait_mask;
siginfo_t *sigwait_info;
HANDLE signal_arrived;
bool will_wait_for_signal;
struct ucontext thread_context;
DWORD thread_id;
siginfo_t infodata;
struct pthread *tid;
class cygthread *_ctinfo;
class san *andreas;
waitq wq;
int sig;
unsigned incyg;
unsigned spinning;
unsigned stacklock;
__stack_t *stackptr;
__stack_t stack[TLS_STACK_SIZE];
unsigned initialized;
/*gentls_offsets*/
void init_thread (void *, DWORD (*) (void *, void *));
static void call (DWORD (*) (void *, void *), void *);
void remove (DWORD);
void push (__stack_t addr) {*stackptr++ = (__stack_t) addr;}
__stack_t __reg1 pop ();
__stack_t retaddr () {return stackptr[-1];}
bool isinitialized () const
{
return initialized == CYGTLS_INITIALIZED;
}
bool __reg3 interrupt_now (CONTEXT *, siginfo_t&, void *, struct sigaction&);
void __reg3 interrupt_setup (siginfo_t&, void *, struct sigaction&);
bool inside_kernel (CONTEXT *);
void __reg2 signal_debugger (siginfo_t&);
#ifdef CYGTLS_HANDLE
operator HANDLE () const {return tid ? tid->win32_obj_id : NULL;}
#endif
int __reg1 call_signal_handler ();
void __reg1 remove_wq (DWORD);
void __reg1 fixup_after_fork ();
void __reg1 lock ();
void __reg1 unlock ();
bool __reg1 locked ();
HANDLE get_signal_arrived (bool wait_for_lock = true)
{
if (!signal_arrived)
{
if (wait_for_lock)
lock ();
if (!signal_arrived)
signal_arrived = CreateEvent (NULL, false, false, NULL);
if (wait_for_lock)
unlock ();
}
return signal_arrived;
}
void set_signal_arrived (bool setit, HANDLE& h)
{
if (!setit)
will_wait_for_signal = false;
else
{
h = get_signal_arrived ();
will_wait_for_signal = true;
}
}
void reset_signal_arrived ()
{
if (signal_arrived)
ResetEvent (signal_arrived);
will_wait_for_signal = false;
}
void handle_SIGCONT ();
private:
void __reg3 call2 (DWORD (*) (void *, void *), void *, void *);
/*gentls_offsets*/
};
#pragma pack(pop)
/* FIXME: Find some way to autogenerate this value */
#ifdef __x86_64__
const int CYGTLS_PADSIZE = 12800; /* Must be 16-byte aligned */
#else
const int CYGTLS_PADSIZE = 12700;
#endif
/*gentls_offsets*/
#include "cygerrno.h"
#include "ntdll.h"
#ifdef __x86_64__
/* When just using a "gs:X" asm for the x86_64 code, gcc wrongly creates
pc-relative instructions. However, NtCurrentTeb() is inline assembler
anyway, so using it here should be fast enough on x86_64. */
#define _tlsbase (NtCurrentTeb()->Tib.StackBase)
#define _tlstop (NtCurrentTeb()->Tib.StackLimit)
#else
extern PVOID _tlsbase __asm__ ("%fs:4");
extern PVOID _tlstop __asm__ ("%fs:8");
#endif
#define _my_tls (*((_cygtls *) ((char *)_tlsbase - CYGTLS_PADSIZE)))
extern _cygtls *_main_tls;
extern _cygtls *_sig_tls;
class san
{
san *_clemente;
jmp_buf _context;
int _errno;
int _c_cnt;
int _w_cnt;
public:
int setup (int myerrno = 0) __attribute__ ((always_inline))
{
_clemente = _my_tls.andreas;
_my_tls.andreas = this;
_errno = myerrno;
_c_cnt = _my_tls.locals.pathbufs.c_cnt;
_w_cnt = _my_tls.locals.pathbufs.w_cnt;
return __sjfault (_context);
}
void leave () __attribute__ ((always_inline))
{
if (_errno)
set_errno (_errno);
/* Restore tls_pathbuf counters in case of error. */
_my_tls.locals.pathbufs.c_cnt = _c_cnt;
_my_tls.locals.pathbufs.w_cnt = _w_cnt;
__ljfault (_context, 1);
}
void reset () __attribute__ ((always_inline))
{
_my_tls.andreas = _clemente;
}
};
class myfault
{
san sebastian;
public:
~myfault () __attribute__ ((always_inline)) { sebastian.reset (); }
inline int faulted () __attribute__ ((always_inline))
{
return sebastian.setup (0);
}
inline int faulted (void const *obj, int myerrno = 0) __attribute__ ((always_inline))
{
return !obj || !(*(const char **) obj) || sebastian.setup (myerrno);
}
inline int faulted (int myerrno) __attribute__ ((always_inline))
{
return sebastian.setup (myerrno);
}
};
class set_signal_arrived
{
public:
set_signal_arrived (bool setit, HANDLE& h) { _my_tls.set_signal_arrived (setit, h); }
set_signal_arrived (HANDLE& h) { _my_tls.set_signal_arrived (true, h); }
operator int () const {return _my_tls.will_wait_for_signal;}
~set_signal_arrived () { _my_tls.reset_signal_arrived (); }
};
#define __getreent() (&_my_tls.local_clib)
/*gentls_offsets*/