81338031c4
The reasons: 1. Get rid of the stubs/quirks with process dethreading, process reparent when the process group leader exits and close to this problems on wait(), waitpid(), etc. 2. Reuse our kernel code instead of writing excessive thread managment routines in Linuxulator. Implementation details: 1. The thread is created via kern_thr_new() in the clone() call with the CLONE_THREAD parameter. Thus, everything else is a process. 2. The test that the process has a threads is done via P_HADTHREADS bit p_flag of struct proc. 3. Per thread emulator state data structure is now located in the struct thread and freed in the thread_dtor() hook. Mandatory holdig of the p_mtx required when referencing emuldata from the other threads. 4. PID mangling has changed. Now Linux pid is the native tid and Linux tgid is the native pid, with the exception of the first thread in the process where tid and pid are one and the same. Ugliness: In case when the Linux thread is the initial thread in the thread group thread id is equal to the process id. Glibc depends on this magic (assert in pthread_getattr_np.c). So for system calls that take thread id as a parameter we should use the special method to reference struct thread. Differential Revision: https://reviews.freebsd.org/D1039
129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/*-
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* Copyright (c) 2006 Roman Divacky
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_MISC_H_
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#define _LINUX_MISC_H_
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/*
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* Miscellaneous
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*/
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#define LINUX_NAME_MAX 255
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#define LINUX_MAX_UTSNAME 65
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#define LINUX_CTL_MAXNAME 10
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/* defines for prctl */
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#define LINUX_PR_SET_PDEATHSIG 1 /* Second arg is a signal. */
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#define LINUX_PR_GET_PDEATHSIG 2 /*
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* Second arg is a ptr to return the
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* signal.
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*/
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#define LINUX_PR_GET_KEEPCAPS 7 /* Get drop capabilities on setuid */
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#define LINUX_PR_SET_KEEPCAPS 8 /* Set drop capabilities on setuid */
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#define LINUX_PR_SET_NAME 15 /* Set process name. */
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#define LINUX_PR_GET_NAME 16 /* Get process name. */
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#define LINUX_MAX_COMM_LEN 16 /* Maximum length of the process name. */
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#define LINUX_MREMAP_MAYMOVE 1
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#define LINUX_MREMAP_FIXED 2
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#define LINUX_PATH_MAX 4096
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extern const char *linux_platform;
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/*
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* Non-standard aux entry types used in Linux ELF binaries.
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*/
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#define LINUX_AT_PLATFORM 15 /* String identifying CPU */
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#define LINUX_AT_HWCAP 16 /* CPU capabilities */
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#define LINUX_AT_CLKTCK 17 /* frequency at which times() increments */
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#define LINUX_AT_SECURE 23 /* secure mode boolean */
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#define LINUX_AT_BASE_PLATFORM 24 /* string identifying real platform, may
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* differ from AT_PLATFORM.
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*/
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#define LINUX_AT_EXECFN 31 /* filename of program */
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/* Linux sets the i387 to extended precision. */
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#if defined(__i386__) || defined(__amd64__)
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#define __LINUX_NPXCW__ 0x37f
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#endif
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#define LINUX_CLONE_VM 0x00000100
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#define LINUX_CLONE_FS 0x00000200
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#define LINUX_CLONE_FILES 0x00000400
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#define LINUX_CLONE_SIGHAND 0x00000800
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#define LINUX_CLONE_PID 0x00001000 /* No longer exist in Linux */
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#define LINUX_CLONE_VFORK 0x00004000
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#define LINUX_CLONE_PARENT 0x00008000
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#define LINUX_CLONE_THREAD 0x00010000
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#define LINUX_CLONE_SETTLS 0x00080000
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#define LINUX_CLONE_PARENT_SETTID 0x00100000
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#define LINUX_CLONE_CHILD_CLEARTID 0x00200000
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#define LINUX_CLONE_CHILD_SETTID 0x01000000
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#define LINUX_THREADING_FLAGS \
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(LINUX_CLONE_VM | LINUX_CLONE_FS | LINUX_CLONE_FILES | \
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LINUX_CLONE_SIGHAND | LINUX_CLONE_THREAD)
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/* Scheduling policies */
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#define LINUX_SCHED_OTHER 0
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#define LINUX_SCHED_FIFO 1
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#define LINUX_SCHED_RR 2
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struct l_new_utsname {
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char sysname[LINUX_MAX_UTSNAME];
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char nodename[LINUX_MAX_UTSNAME];
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char release[LINUX_MAX_UTSNAME];
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char version[LINUX_MAX_UTSNAME];
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char machine[LINUX_MAX_UTSNAME];
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char domainname[LINUX_MAX_UTSNAME];
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};
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#define LINUX_CLOCK_REALTIME 0
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#define LINUX_CLOCK_MONOTONIC 1
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#define LINUX_CLOCK_PROCESS_CPUTIME_ID 2
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#define LINUX_CLOCK_THREAD_CPUTIME_ID 3
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#define LINUX_CLOCK_REALTIME_HR 4
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#define LINUX_CLOCK_MONOTONIC_HR 5
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extern int stclohz;
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#define __WCLONE 0x80000000
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int linux_common_wait(struct thread *td, int pid, int *status,
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int options, struct rusage *ru);
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int linux_set_upcall_kse(struct thread *td, register_t stack);
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int linux_set_cloned_tls(struct thread *td, void *desc);
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struct thread *linux_tdfind(struct thread *, lwpid_t, pid_t);
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#endif /* _LINUX_MISC_H_ */
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