445 lines
10 KiB
C++
445 lines
10 KiB
C++
/* cygtls.h
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Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013,
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2014, 2015 Red Hat, Inc.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#pragma once
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#include <signal.h>
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#include <pwd.h>
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#include <grp.h>
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#include <time.h>
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#define _NOMNTENT_FUNCS
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#include <mntent.h>
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#undef _NOMNTENT_FUNCS
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#include <setjmp.h>
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#include <ucontext.h>
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#define CYGTLS_INITIALIZED 0xc763173f
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#ifndef CYG_MAX_PATH
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# define CYG_MAX_PATH 260
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#endif
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#ifndef UNLEN
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# define UNLEN 256
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#endif
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#define TLS_STACK_SIZE 256
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#include "cygthread.h"
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#define TP_NUM_C_BUFS 50
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#define TP_NUM_W_BUFS 50
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#ifdef CYGTLS_HANDLE
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#include "thread.h"
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#endif
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#ifdef __x86_64__
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#pragma pack(push,8)
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#else
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#pragma pack(push,4)
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#endif
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/* Defined here to support auto rebuild of tlsoffsets.h. */
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class tls_pathbuf
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{
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/* Make sure that c_cnt and w_cnt are always the first two members of this
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class, and never change the size (32 bit), unless you also change the
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mov statements in sigbe! */
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union
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{
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struct
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{
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uint32_t c_cnt;
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uint32_t w_cnt;
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};
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uint64_t _counters;
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};
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char *c_buf[TP_NUM_C_BUFS];
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WCHAR *w_buf[TP_NUM_W_BUFS];
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public:
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void destroy ();
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friend class tmp_pathbuf;
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friend class san;
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};
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class unionent
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{
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public:
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char *name;
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char **list;
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short port_proto_addrtype;
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short h_len;
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union
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{
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char *s_proto;
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char **h_addr_list;
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};
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enum struct_type
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{
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t_hostent, t_protoent, t_servent
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};
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};
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struct _local_storage
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{
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/* passwd.cc */
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char pass[_PASSWORD_LEN];
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/* dlfcn.cc */
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int dl_error;
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char dl_buffer[256];
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/* path.cc */
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struct mntent mntbuf;
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int iteration;
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unsigned available_drives;
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char mnt_type[80];
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char mnt_opts[80];
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char mnt_fsname[CYG_MAX_PATH];
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char mnt_dir[CYG_MAX_PATH];
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/* select.cc */
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struct {
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HANDLE sockevt;
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int max_w4;
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LONG *ser_num; // note: malloced
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HANDLE *w4; // note: malloced
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} select;
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/* strerror errno.cc */
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char strerror_buf[sizeof ("Unknown error -2147483648")];
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char strerror_r_buf[sizeof ("Unknown error -2147483648")];
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/* times.cc */
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char timezone_buf[20];
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/* strsig.cc */
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char signamebuf[sizeof ("Unknown signal 4294967295 ")];
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/* net.cc */
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char *ntoa_buf; // note: malloced
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unionent *hostent_buf; // note: malloced
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unionent *protoent_buf; // note: malloced
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unionent *servent_buf; // note: malloced
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/* cygthread.cc */
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char unknown_thread_name[30];
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/* syscalls.cc */
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int setmode_file;
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int setmode_mode;
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/* thread.cc */
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HANDLE cw_timer;
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tls_pathbuf pathbufs;
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char ttybuf[32];
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};
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typedef struct struct_waitq
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{
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int pid;
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int options;
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int status;
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HANDLE ev;
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void *rusage; /* pointer to potential rusage */
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struct struct_waitq *next;
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HANDLE thread_ev;
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} waitq;
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/* Changes to the below structure may require acompanying changes to the very
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simple parser in the perl script 'gentls_offsets' (<<-- start parsing here).
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The union in this structure is used to force alignment between the version
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of the compiler used to generate tlsoffsets.h and the cygwin cross compiler.
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*/
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/*gentls_offsets*/
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extern "C" int __sjfault (jmp_buf);
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extern "C" int __ljfault (jmp_buf, int);
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/*gentls_offsets*/
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typedef uintptr_t __tlsstack_t;
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class _cygtls
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{
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public:
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/* Please keep these two declarations first */
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struct _local_storage locals;
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union
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{
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struct _reent local_clib;
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char __dontuse[8 * ((sizeof(struct _reent) + 4) / 8)];
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};
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/**/
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void (*func) /*gentls_offsets*/(int, siginfo_t *, void *)/*gentls_offsets*/;
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int saved_errno;
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int sa_flags;
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sigset_t oldmask;
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sigset_t deltamask;
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int *errno_addr;
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sigset_t sigmask;
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sigset_t sigwait_mask;
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stack_t altstack;
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siginfo_t *sigwait_info;
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HANDLE signal_arrived;
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bool will_wait_for_signal;
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long __align; /* Needed to align context to 16 byte. */
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ucontext_t context;
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DWORD thread_id;
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siginfo_t infodata;
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struct pthread *tid;
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class cygthread *_ctinfo;
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class san *andreas;
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waitq wq;
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int sig;
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unsigned incyg;
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unsigned spinning;
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unsigned stacklock;
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__tlsstack_t *stackptr;
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__tlsstack_t stack[TLS_STACK_SIZE];
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unsigned initialized;
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/*gentls_offsets*/
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void init_thread (void *, DWORD (*) (void *, void *));
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static void call (DWORD (*) (void *, void *), void *);
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void remove (DWORD);
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void push (__tlsstack_t addr) {*stackptr++ = (__tlsstack_t) addr;}
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__tlsstack_t __reg1 pop ();
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__tlsstack_t retaddr () {return stackptr[-1];}
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bool isinitialized () const
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{
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return initialized == CYGTLS_INITIALIZED;
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}
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bool __reg3 interrupt_now (CONTEXT *, siginfo_t&, void *, struct sigaction&);
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void __reg3 interrupt_setup (siginfo_t&, void *, struct sigaction&);
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bool inside_kernel (CONTEXT *);
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void __reg2 signal_debugger (siginfo_t&);
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#ifdef CYGTLS_HANDLE
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operator HANDLE () const {return tid ? tid->win32_obj_id : NULL;}
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#endif
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int __reg1 call_signal_handler ();
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void __reg1 remove_wq (DWORD);
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void __reg1 fixup_after_fork ();
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void __reg1 lock ();
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void __reg1 unlock ();
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bool __reg1 locked ();
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HANDLE get_signal_arrived (bool wait_for_lock = true)
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{
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if (!signal_arrived)
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{
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if (wait_for_lock)
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lock ();
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if (!signal_arrived)
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signal_arrived = CreateEvent (NULL, false, false, NULL);
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if (wait_for_lock)
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unlock ();
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}
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return signal_arrived;
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}
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void set_signal_arrived (bool setit, HANDLE& h)
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{
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if (!setit)
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will_wait_for_signal = false;
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else
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{
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h = get_signal_arrived ();
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will_wait_for_signal = true;
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}
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}
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void reset_signal_arrived ()
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{
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if (signal_arrived)
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ResetEvent (signal_arrived);
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will_wait_for_signal = false;
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}
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void handle_SIGCONT ();
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private:
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void __reg3 call2 (DWORD (*) (void *, void *), void *, void *);
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void remove_pending_sigs ();
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/*gentls_offsets*/
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};
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#pragma pack(pop)
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#include "cygtls_padsize.h"
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/*gentls_offsets*/
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#include "cygerrno.h"
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#include "ntdll.h"
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#ifdef __x86_64__
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/* When just using a "gs:X" asm for the x86_64 code, gcc wrongly creates
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pc-relative instructions. However, NtCurrentTeb() is inline assembler
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anyway, so using it here should be fast enough on x86_64. */
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#define _tlsbase (NtCurrentTeb()->Tib.StackBase)
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#define _tlstop (NtCurrentTeb()->Tib.StackLimit)
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#else
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extern PVOID _tlsbase __asm__ ("%fs:4");
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extern PVOID _tlstop __asm__ ("%fs:8");
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#endif
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#define _my_tls (*((_cygtls *) ((char *)_tlsbase - CYGTLS_PADSIZE)))
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extern _cygtls *_main_tls;
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extern _cygtls *_sig_tls;
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#ifdef __x86_64__
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class san
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{
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san *_clemente;
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uint64_t _cnt;
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public:
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DWORD64 ret;
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DWORD64 frame;
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san (PVOID _ret) __attribute__ ((always_inline))
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{
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_clemente = _my_tls.andreas;
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_my_tls.andreas = this;
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_cnt = _my_tls.locals.pathbufs._counters;
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/* myfault_altstack_handler needs the current stack pointer and the
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address of the _except block to restore the context correctly.
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See comment preceeding myfault_altstack_handler in exception.cc. */
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ret = (DWORD64) _ret;
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__asm__ volatile ("movq %%rsp,%0": "=o" (frame));
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}
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~san () __attribute__ ((always_inline))
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{
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_my_tls.andreas = _clemente;
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}
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/* This is the first thing called in the __except handler. The attribute
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"returns_twice" makes sure that GCC disregards any register value set
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earlier in the function, so this call serves as a register barrier. */
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void leave () __attribute__ ((returns_twice));
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};
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#else
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class san
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{
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san *_clemente;
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jmp_buf _context;
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uint32_t _c_cnt;
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uint32_t _w_cnt;
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public:
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int setup () __attribute__ ((always_inline))
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{
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_clemente = _my_tls.andreas;
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_my_tls.andreas = this;
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_c_cnt = _my_tls.locals.pathbufs.c_cnt;
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_w_cnt = _my_tls.locals.pathbufs.w_cnt;
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return __sjfault (_context);
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}
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void leave () __attribute__ ((always_inline))
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{
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/* Restore tls_pathbuf counters in case of error. */
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_my_tls.locals.pathbufs.c_cnt = _c_cnt;
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_my_tls.locals.pathbufs.w_cnt = _w_cnt;
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__ljfault (_context, 1);
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}
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void reset () __attribute__ ((always_inline))
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{
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_my_tls.andreas = _clemente;
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}
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};
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class myfault
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{
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san sebastian;
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public:
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~myfault () __attribute__ ((always_inline)) { sebastian.reset (); }
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inline int faulted () __attribute__ ((always_inline))
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{
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return sebastian.setup ();
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}
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};
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#endif
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/* Exception handling macros. These are required because SEH differs a lot
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between 32 and 64 bit. Essentially, on 64 bit, we have to create compile
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time SEH tables which define the handler and try/except labels, while on
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32 bit we can simply set up an SJLJ handler within the myfault class. */
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#define __mem_barrier __asm__ __volatile__ ("" ::: "memory")
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#ifdef __x86_64__
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#define __try \
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{ \
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__label__ __l_try, __l_except, __l_endtry; \
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__mem_barrier; \
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san __sebastian (&&__l_except); \
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__asm__ goto ("\n" \
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" .seh_handler _ZN9exception7myfaultEP17_EXCEPTION_RECORDPvP8_CONTEXTP19_DISPATCHER_CONTEXT, @except \n" \
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" .seh_handlerdata \n" \
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" .long 1 \n" \
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" .rva %l[__l_try],%l[__l_endtry],%l[__l_except],%l[__l_except] \n" \
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" .seh_code \n" \
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: : : : __l_try, __l_endtry, __l_except); \
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{ \
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__l_try: \
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__mem_barrier;
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#define __leave \
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goto __l_endtry
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#define __except(__errno) \
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goto __l_endtry; \
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} \
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{ \
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__l_except: \
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__mem_barrier; \
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__sebastian.leave (); \
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if (__errno) \
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set_errno (__errno);
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#define __endtry \
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} \
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__l_endtry: \
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__mem_barrier; \
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}
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#else /* !__x86_64__ */
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#define __try \
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{ \
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__label__ __l_endtry; \
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myfault efault; \
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if (!efault.faulted ()) \
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{
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#define __leave \
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goto __l_endtry
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#define __except(__errno) \
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goto __l_endtry; \
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} \
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{ \
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if (__errno) \
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set_errno (__errno);
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#define __endtry \
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} \
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__l_endtry: \
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__mem_barrier; \
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}
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#endif /* __x86_64__ */
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class set_signal_arrived
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{
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public:
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set_signal_arrived (bool setit, HANDLE& h) { _my_tls.set_signal_arrived (setit, h); }
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set_signal_arrived (HANDLE& h) { _my_tls.set_signal_arrived (true, h); }
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operator int () const {return _my_tls.will_wait_for_signal;}
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~set_signal_arrived () { _my_tls.reset_signal_arrived (); }
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};
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#define __getreent() (&_my_tls.local_clib)
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/*gentls_offsets*/
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