442 lines
10 KiB
C++
442 lines
10 KiB
C++
/* cygtls.h
|
|
|
|
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>
|
|
#include <ucontext.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 50
|
|
#define TP_NUM_W_BUFS 50
|
|
|
|
#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
|
|
{
|
|
/* Make sure that c_cnt and w_cnt are always the first two members of this
|
|
class, and never change the size (32 bit), unless you also change the
|
|
mov statements in sigbe! */
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
uint32_t c_cnt;
|
|
uint32_t w_cnt;
|
|
};
|
|
uint64_t _counters;
|
|
};
|
|
char *c_buf[TP_NUM_C_BUFS];
|
|
WCHAR *w_buf[TP_NUM_W_BUFS];
|
|
|
|
public:
|
|
void destroy ();
|
|
friend class tmp_pathbuf;
|
|
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
|
|
{
|
|
/* passwd.cc */
|
|
char pass[_PASSWORD_LEN];
|
|
|
|
/* dlfcn.cc */
|
|
int dl_error;
|
|
char dl_buffer[256];
|
|
|
|
/* 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;
|
|
|
|
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 __tlsstack_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;
|
|
stack_t altstack;
|
|
siginfo_t *sigwait_info;
|
|
HANDLE signal_arrived;
|
|
bool will_wait_for_signal;
|
|
long __align; /* Needed to align context to 16 byte. */
|
|
/* context MUST be aligned to 16 byte, otherwise RtlCaptureContext fails.
|
|
If you prepend cygtls members here, make sure context stays 16 byte
|
|
aligned. */
|
|
ucontext_t 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;
|
|
__tlsstack_t *stackptr;
|
|
__tlsstack_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 (__tlsstack_t addr) {*stackptr++ = (__tlsstack_t) addr;}
|
|
__tlsstack_t __reg1 pop ();
|
|
__tlsstack_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 wait_signal_arrived (bool setit, HANDLE& h)
|
|
{
|
|
if (!setit)
|
|
will_wait_for_signal = false;
|
|
else
|
|
{
|
|
h = get_signal_arrived ();
|
|
will_wait_for_signal = true;
|
|
}
|
|
}
|
|
void set_signal_arrived ()
|
|
{
|
|
SetEvent (get_signal_arrived (false));
|
|
}
|
|
void reset_signal_arrived ()
|
|
{
|
|
if (signal_arrived)
|
|
ResetEvent (signal_arrived);
|
|
}
|
|
void unwait_signal_arrived ()
|
|
{
|
|
will_wait_for_signal = false;
|
|
}
|
|
void handle_SIGCONT ();
|
|
private:
|
|
void __reg3 call2 (DWORD (*) (void *, void *), void *, void *);
|
|
void remove_pending_sigs ();
|
|
/*gentls_offsets*/
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
#include "cygtls_padsize.h"
|
|
|
|
/*gentls_offsets*/
|
|
|
|
#include "cygerrno.h"
|
|
#include "ntdll.h"
|
|
|
|
#define _my_tls (*((_cygtls *) ((PBYTE) NtCurrentTeb()->Tib.StackBase - CYGTLS_PADSIZE)))
|
|
extern _cygtls *_main_tls;
|
|
extern _cygtls *_sig_tls;
|
|
|
|
#ifdef __x86_64__
|
|
class san
|
|
{
|
|
san *_clemente;
|
|
uint64_t _cnt;
|
|
public:
|
|
DWORD64 ret;
|
|
DWORD64 frame;
|
|
|
|
san (PVOID _ret) __attribute__ ((always_inline))
|
|
{
|
|
_clemente = _my_tls.andreas;
|
|
_my_tls.andreas = this;
|
|
_cnt = _my_tls.locals.pathbufs._counters;
|
|
/* myfault_altstack_handler needs the current stack pointer and the
|
|
address of the _except block to restore the context correctly.
|
|
See comment preceeding myfault_altstack_handler in exception.cc. */
|
|
ret = (DWORD64) _ret;
|
|
__asm__ volatile ("movq %%rsp,%0": "=o" (frame));
|
|
}
|
|
~san () __attribute__ ((always_inline))
|
|
{
|
|
_my_tls.andreas = _clemente;
|
|
}
|
|
/* This is the first thing called in the __except handler. The attribute
|
|
"returns_twice" makes sure that GCC disregards any register value set
|
|
earlier in the function, so this call serves as a register barrier. */
|
|
void leave () __attribute__ ((returns_twice));
|
|
};
|
|
#else
|
|
class san
|
|
{
|
|
san *_clemente;
|
|
jmp_buf _context;
|
|
uint32_t _c_cnt;
|
|
uint32_t _w_cnt;
|
|
public:
|
|
int setup () __attribute__ ((always_inline))
|
|
{
|
|
_clemente = _my_tls.andreas;
|
|
_my_tls.andreas = this;
|
|
_c_cnt = _my_tls.locals.pathbufs.c_cnt;
|
|
_w_cnt = _my_tls.locals.pathbufs.w_cnt;
|
|
return __sjfault (_context);
|
|
}
|
|
void leave () __attribute__ ((always_inline))
|
|
{
|
|
/* 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 ();
|
|
}
|
|
};
|
|
#endif
|
|
|
|
/* Exception handling macros. These are required because SEH differs a lot
|
|
between 32 and 64 bit. Essentially, on 64 bit, we have to create compile
|
|
time SEH tables which define the handler and try/except labels, while on
|
|
32 bit we can simply set up an SJLJ handler within the myfault class. */
|
|
#define __mem_barrier __asm__ __volatile__ ("" ::: "memory")
|
|
#ifdef __x86_64__
|
|
#define __try \
|
|
{ \
|
|
__label__ __l_try, __l_except, __l_endtry; \
|
|
__mem_barrier; \
|
|
san __sebastian (&&__l_except); \
|
|
__asm__ goto ("\n" \
|
|
" .seh_handler _ZN9exception7myfaultEP17_EXCEPTION_RECORDPvP8_CONTEXTP19_DISPATCHER_CONTEXT, @except \n" \
|
|
" .seh_handlerdata \n" \
|
|
" .long 1 \n" \
|
|
" .rva %l[__l_try],%l[__l_endtry],%l[__l_except],%l[__l_except] \n" \
|
|
" .seh_code \n" \
|
|
: : : : __l_try, __l_endtry, __l_except); \
|
|
{ \
|
|
__l_try: \
|
|
__mem_barrier;
|
|
|
|
#define __leave \
|
|
goto __l_endtry
|
|
|
|
#define __except(__errno) \
|
|
goto __l_endtry; \
|
|
} \
|
|
{ \
|
|
__l_except: \
|
|
__mem_barrier; \
|
|
__sebastian.leave (); \
|
|
if (__errno) \
|
|
set_errno (__errno);
|
|
|
|
#define __endtry \
|
|
} \
|
|
__l_endtry: \
|
|
__mem_barrier; \
|
|
}
|
|
|
|
#else /* !__x86_64__ */
|
|
#define __try \
|
|
{ \
|
|
__label__ __l_endtry; \
|
|
myfault efault; \
|
|
if (!efault.faulted ()) \
|
|
{
|
|
|
|
#define __leave \
|
|
goto __l_endtry
|
|
|
|
#define __except(__errno) \
|
|
goto __l_endtry; \
|
|
} \
|
|
{ \
|
|
if (__errno) \
|
|
set_errno (__errno);
|
|
|
|
#define __endtry \
|
|
} \
|
|
__l_endtry: \
|
|
__mem_barrier; \
|
|
}
|
|
#endif /* __x86_64__ */
|
|
|
|
class wait_signal_arrived
|
|
{
|
|
public:
|
|
wait_signal_arrived (bool setit, HANDLE& h) { _my_tls.wait_signal_arrived (setit, h); }
|
|
wait_signal_arrived (HANDLE& h) { _my_tls.wait_signal_arrived (true, h); }
|
|
|
|
operator int () const {return _my_tls.will_wait_for_signal;}
|
|
/* Do not reset the signal_arrived event just because we leave the scope of
|
|
this wait_signal_arrived object. This may lead to all sorts of races.
|
|
The only method actually resetting the signal_arrived event is
|
|
_cygtls::call_signal_handler. */
|
|
~wait_signal_arrived () { _my_tls.unwait_signal_arrived (); }
|
|
};
|
|
/*gentls_offsets*/
|