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freebsd-dev/sys/compat/cloudabi/cloudabi_util.h

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Add a sysentvec for CloudABI on x86-64. Summary: For CloudABI we need to put two things on the stack of new processes: the argument data (a binary blob; not strings) and a startup data structure. The startup data structure contains interesting things such as a pointer to the ELF program header, the thread ID of the initial thread, a stack smashing protection canary, and a pointer to the argument data. Fetching system call arguments and setting the return value is similar to FreeBSD. The only differences are that system call 0 does not exist and that we call into cloudabi_convert_errno() to convert the error code. We also need this function in a couple of other places, so we'd better reuse it here. Reviewers: dchagin, kib Reviewed By: kib Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3098
2015-07-16 18:24:06 +00:00
/*-
Make file descriptor passing for CloudABI's recvmsg() work. Similar to the change for sendmsg(), create a pointer size independent implementation of recvmsg() and let cloudabi32 and cloudabi64 call into it. In case userspace requests one or more file descriptors, call kern_recvit() in such a way that we get the control message headers in an mbuf. Iterate over all of the headers and copy the file descriptors to userspace.
2017-03-22 19:20:39 +00:00
* Copyright (c) 2015-2017 Nuxi, https://nuxi.nl/
Add a sysentvec for CloudABI on x86-64. Summary: For CloudABI we need to put two things on the stack of new processes: the argument data (a binary blob; not strings) and a startup data structure. The startup data structure contains interesting things such as a pointer to the ELF program header, the thread ID of the initial thread, a stack smashing protection canary, and a pointer to the argument data. Fetching system call arguments and setting the return value is similar to FreeBSD. The only differences are that system call 0 does not exist and that we call into cloudabi_convert_errno() to convert the error code. We also need this function in a couple of other places, so we'd better reuse it here. Reviewers: dchagin, kib Reviewed By: kib Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3098
2015-07-16 18:24:06 +00:00
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _CLOUDABI_UTIL_H_
#define _CLOUDABI_UTIL_H_
Add the remaining pointer size independent CloudABI socket system calls. CloudABI uses a structure called cloudabi_sockstat_t. Think of it as 'struct stat' for sockets. It is used by functions such as getsockname(), getpeername(), some of the getsockopt() values, etc. This change implements the sock_stat_get() system call that returns a copy of this structure. The accept() system call should also return a full copy of this structure eventually, but for now we're only interested in the peer address. Add a TODO() to make sure this is patched up later on. Differential Revision: https://reviews.freebsd.org/D3218
2015-08-05 08:18:05 +00:00
#include <sys/socket.h>
Replace the CloudABI system call table by a machine generated version. The type definitions and constants that were used by COMPAT_CLOUDABI64 are a literal copy of some headers stored inside of CloudABI's C library, cloudlibc. What is annoying is that we can't make use of cloudlibc's system call list, as the format is completely different and doesn't provide enough information. It had to be synced in manually. We recently decided to solve this (and some other problems) by moving the ABI definitions into a separate file: https://github.com/NuxiNL/cloudabi/blob/master/cloudabi.txt This file is processed by a pile of Python scripts to generate the header files like before, documentation (markdown), but in our case more importantly: a FreeBSD system call table. This change discards the old files in sys/contrib/cloudabi and replaces them by the latest copies, which requires some minor changes here and there. Because cloudabi.txt also enforces consistent names of the system call arguments, we have to patch up a small number of system call implementations to use the new argument names. The new header files can also be included directly in FreeBSD kernel space without needing any includes/defines, so we can now remove cloudabi_syscalldefs.h and cloudabi64_syscalldefs.h. Patch up the sources to include the definitions directly from sys/contrib/cloudabi instead.
2016-03-24 21:47:15 +00:00
#include <contrib/cloudabi/cloudabi_types_common.h>
Add a sysentvec for CloudABI on x86-64. Summary: For CloudABI we need to put two things on the stack of new processes: the argument data (a binary blob; not strings) and a startup data structure. The startup data structure contains interesting things such as a pointer to the ELF program header, the thread ID of the initial thread, a stack smashing protection canary, and a pointer to the argument data. Fetching system call arguments and setting the return value is similar to FreeBSD. The only differences are that system call 0 does not exist and that we call into cloudabi_convert_errno() to convert the error code. We also need this function in a couple of other places, so we'd better reuse it here. Reviewers: dchagin, kib Reviewed By: kib Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3098
2015-07-16 18:24:06 +00:00
Make fstat() and friends work. Summary: CloudABI provides access to two different stat structures: - fdstat, containing file descriptor level status: oflags, file descriptor type and Capsicum rights, used by cap_rights_get(), fcntl(F_GETFL), getsockopt(SO_TYPE). - filestat, containing your regular file status: timestamps, inode number, used by fstat(). Unlike FreeBSD's stat::st_mode, CloudABI file descriptor types don't have overloaded meanings (e.g., returning S_ISCHR() for kqueues). Add a utility function to extract the type of a file descriptor accurately. CloudABI does not work with O_ACCMODEs. File descriptors have two sets of Capsicum-style rights: rights that apply to the file descriptor itself ('base') and rights that apply to any new file descriptors yielded through openat() ('inheriting'). Though not perfect, we can pretty safely decompose Capsicum rights to such a pair. This is done in convert_capabilities(). Test Plan: Tests for these system calls are fairly extensive in cloudlibc. Reviewers: jonathan, mjg, #manpages Reviewed By: mjg Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3171
2015-07-28 06:36:49 +00:00
struct file;
Provide the CloudABI vDSO to its executables. CloudABI executables already provide support for passing in vDSOs. This functionality is used by the emulator for OS X to inject system call handlers. On FreeBSD, we could use it to optimize calls to gettimeofday(), etc. Though I don't have any plans to optimize any system calls right now, let's go ahead and already pass in a vDSO. This will allow us to simplify the executables, as the traditional "syscall" shims can be removed entirely. It also means that we gain more flexibility with regards to adding and removing system calls. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D7438
2016-08-10 21:02:41 +00:00
struct sysentvec;
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
struct thread;
Make clock_gettime() and clock_getres() work for CloudABI programs. Though the standard C library uses a 'struct timespec' using a 64-bit 'time_t', there is no need to use such a type at the system call level. CloudABI uses a simple 64-bit unsigned timestamp in nanoseconds. This is sufficient to express any time value from 1970 to 2554. The CloudABI low-level interface also supports fetching timestamp values with a lower precision. Instead of overloading the clock ID argument for this purpose, the system call provides a precision argument that may be used to specify the maximum slack. The current system call implementation does not use this information, but it's good to already have this available. Expose cloudabi_convert_timespec(), as we're going to need this for fstat() as well. Obtained from: https://github.com/NuxiNL/freebsd
2015-07-21 15:08:13 +00:00
struct timespec;
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
/* Fetches the time value of a clock. */
int cloudabi_clock_time_get(struct thread *, cloudabi_clockid_t,
cloudabi_timestamp_t *);
Add a sysentvec for CloudABI on x86-64. Summary: For CloudABI we need to put two things on the stack of new processes: the argument data (a binary blob; not strings) and a startup data structure. The startup data structure contains interesting things such as a pointer to the ELF program header, the thread ID of the initial thread, a stack smashing protection canary, and a pointer to the argument data. Fetching system call arguments and setting the return value is similar to FreeBSD. The only differences are that system call 0 does not exist and that we call into cloudabi_convert_errno() to convert the error code. We also need this function in a couple of other places, so we'd better reuse it here. Reviewers: dchagin, kib Reviewed By: kib Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3098
2015-07-16 18:24:06 +00:00
/* Converts a FreeBSD errno to a CloudABI errno. */
cloudabi_errno_t cloudabi_convert_errno(int);
Make fstat() and friends work. Summary: CloudABI provides access to two different stat structures: - fdstat, containing file descriptor level status: oflags, file descriptor type and Capsicum rights, used by cap_rights_get(), fcntl(F_GETFL), getsockopt(SO_TYPE). - filestat, containing your regular file status: timestamps, inode number, used by fstat(). Unlike FreeBSD's stat::st_mode, CloudABI file descriptor types don't have overloaded meanings (e.g., returning S_ISCHR() for kqueues). Add a utility function to extract the type of a file descriptor accurately. CloudABI does not work with O_ACCMODEs. File descriptors have two sets of Capsicum-style rights: rights that apply to the file descriptor itself ('base') and rights that apply to any new file descriptors yielded through openat() ('inheriting'). Though not perfect, we can pretty safely decompose Capsicum rights to such a pair. This is done in convert_capabilities(). Test Plan: Tests for these system calls are fairly extensive in cloudlibc. Reviewers: jonathan, mjg, #manpages Reviewed By: mjg Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3171
2015-07-28 06:36:49 +00:00
/* Converts a file descriptor to a CloudABI file descriptor type. */
cloudabi_filetype_t cloudabi_convert_filetype(const struct file *);
Add file_open(): the underlying system call of openat(). CloudABI purely operates on file descriptor rights (CAP_*). File descriptor access modes (O_ACCMODE) are emulated on top of rights. Instead of accepting the traditional flags argument, file_open() copies in an fdstat_t object that contains the initial rights the descriptor should have, but also file descriptor flags that should persist after opening (APPEND, NONBLOCK, *SYNC). Only flags that don't persist (EXCL, TRUNC, CREAT, DIRECTORY) are passed in as an argument. file_open() first converts the rights, the persistent flags and the non-persistent flags to fflags. It then calls into vn_open(). If successful, it installs the file descriptor with the requested rights, trimming off rights that don't apply to the type of the file that has been opened. Unlike kern_openat(), this function does not support /dev/fd/*. I can't think of a reason why we need to support this for CloudABI. Obtained from: https://github.com/NuxiNL/freebsd Differential Revision: https://reviews.freebsd.org/D3235
2015-08-06 06:47:28 +00:00
/* Converts CloudABI rights to a set of Capsicum capabilities. */
int cloudabi_convert_rights(cloudabi_rights_t, cap_rights_t *);
/* Removes rights that conflict with the file descriptor type. */
void cloudabi_remove_conflicting_rights(cloudabi_filetype_t,
cloudabi_rights_t *, cloudabi_rights_t *);
Make clock_gettime() and clock_getres() work for CloudABI programs. Though the standard C library uses a 'struct timespec' using a 64-bit 'time_t', there is no need to use such a type at the system call level. CloudABI uses a simple 64-bit unsigned timestamp in nanoseconds. This is sufficient to express any time value from 1970 to 2554. The CloudABI low-level interface also supports fetching timestamp values with a lower precision. Instead of overloading the clock ID argument for this purpose, the system call provides a precision argument that may be used to specify the maximum slack. The current system call implementation does not use this information, but it's good to already have this available. Expose cloudabi_convert_timespec(), as we're going to need this for fstat() as well. Obtained from: https://github.com/NuxiNL/freebsd
2015-07-21 15:08:13 +00:00
/* Converts a struct timespec to a CloudABI timestamp. */
int cloudabi_convert_timespec(const struct timespec *, cloudabi_timestamp_t *);
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
/*
* Blocking futex functions.
*
* These functions are called by CloudABI's polling system calls to
* sleep on a lock or condition variable.
*/
int cloudabi_futex_condvar_wait(struct thread *, cloudabi_condvar_t *,
Sync in the latest CloudABI system call definitions. Some time ago I made a change to merge together the memory scope definitions used by mmap (MAP_{PRIVATE,SHARED}) and lock objects (PTHREAD_PROCESS_{PRIVATE,SHARED}). Though that sounded pretty smart back then, it's backfiring. In the case of mmap it's used with other flags in a bitmask, but for locking it's an enumeration. As our plan is to automatically generate bindings for other languages, that looks a bit sloppy. Change all of the locking functions to use separate flags instead. Obtained from: https://github.com/NuxiNL/cloudabi
2016-03-31 18:50:06 +00:00
cloudabi_scope_t, cloudabi_lock_t *, cloudabi_scope_t, cloudabi_clockid_t,
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
cloudabi_timestamp_t, cloudabi_timestamp_t);
int cloudabi_futex_lock_rdlock(struct thread *, cloudabi_lock_t *,
Sync in the latest CloudABI system call definitions. Some time ago I made a change to merge together the memory scope definitions used by mmap (MAP_{PRIVATE,SHARED}) and lock objects (PTHREAD_PROCESS_{PRIVATE,SHARED}). Though that sounded pretty smart back then, it's backfiring. In the case of mmap it's used with other flags in a bitmask, but for locking it's an enumeration. As our plan is to automatically generate bindings for other languages, that looks a bit sloppy. Change all of the locking functions to use separate flags instead. Obtained from: https://github.com/NuxiNL/cloudabi
2016-03-31 18:50:06 +00:00
cloudabi_scope_t, cloudabi_clockid_t, cloudabi_timestamp_t,
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
cloudabi_timestamp_t);
int cloudabi_futex_lock_wrlock(struct thread *, cloudabi_lock_t *,
Sync in the latest CloudABI system call definitions. Some time ago I made a change to merge together the memory scope definitions used by mmap (MAP_{PRIVATE,SHARED}) and lock objects (PTHREAD_PROCESS_{PRIVATE,SHARED}). Though that sounded pretty smart back then, it's backfiring. In the case of mmap it's used with other flags in a bitmask, but for locking it's an enumeration. As our plan is to automatically generate bindings for other languages, that looks a bit sloppy. Change all of the locking functions to use separate flags instead. Obtained from: https://github.com/NuxiNL/cloudabi
2016-03-31 18:50:06 +00:00
cloudabi_scope_t, cloudabi_clockid_t, cloudabi_timestamp_t,
Add a futex implementation for CloudABI. Summary: CloudABI provides two different types of futex objects: read-write locks and condition variables. There is no need to provide separate support for once objects and thread joining, as these are efficiently simulated by blocking on a read-write lock. Mutexes simply use read-write locks. Condition variables always have a lock object associated to them. They always know to which lock a thread needs to be migrated if woken up. This allows us to implement requeueing. A broadcast on a condition variable will never cause multiple threads to be woken up at once. They will be woken up iteratively. This implementation still has lots of room for improvement. Locking is coarse and right now we use linked lists to store all of the locks and condition variables, instead of using a hash table. The primary goal of this implementation was to behave correctly. Performance will be improved as we go. Test Plan: This futex implementation has been in use for the last couple of months and seems to work pretty well. All of the cloudlibc and libc++ unit tests seem to pass. Reviewers: dchagin, kib, vangyzen Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3148
2015-07-27 10:07:29 +00:00
cloudabi_timestamp_t);
Make file descriptor passing work for CloudABI's sendmsg(). Reduce the potential amount of code duplication between cloudabi32 and cloudabi64 by creating a cloudabi_sock_recv() utility function. The cloudabi32 and cloudabi64 modules will then only contain code to convert the iovecs to the native pointer size. In cloudabi_sock_recv(), we can now construct an SCM_RIGHTS cmsghdr in an mbuf and pass that on to kern_sendit().
2017-03-22 06:43:10 +00:00
/* Socket operations. */
Make file descriptor passing for CloudABI's recvmsg() work. Similar to the change for sendmsg(), create a pointer size independent implementation of recvmsg() and let cloudabi32 and cloudabi64 call into it. In case userspace requests one or more file descriptors, call kern_recvit() in such a way that we get the control message headers in an mbuf. Iterate over all of the headers and copy the file descriptors to userspace.
2017-03-22 19:20:39 +00:00
int cloudabi_sock_recv(struct thread *, cloudabi_fd_t, struct iovec *, size_t,
Upgrade to the latest sources generated from the CloudABI specification. The CloudABI specification has had some minor changes over the last half year. No substantial features have been added, but some features that are deemed unnecessary in retrospect have been removed: - mlock()/munlock(): These calls tend to be used for two different purposes: real-time support and handling of sensitive (cryptographic) material that shouldn't end up in swap. The former use case is out of scope for CloudABI. The latter may also be handled by encrypting swap. Removing this has the advantage that we no longer need to worry about having resource limits put in place. - SOCK_SEQPACKET: Support for SOCK_SEQPACKET is rather inconsistent across various operating systems. Some operating systems supported by CloudABI (e.g., macOS) don't support it at all. Considering that they are rarely used, remove support for the time being. - getsockname(), getpeername(), etc.: A shortcoming of the sockets API is that it doesn't allow you to create socket(pair)s, having fake socket addresses associated with them. This makes it harder to test applications or transparently forward (proxy) connections to them. With CloudABI, we're slowly moving networking connectivity into a separate daemon called Flower. In addition to passing around socket file descriptors, this daemon provides address information in the form of arbitrary string labels. There is thus no longer any need for requesting socket address information from the kernel itself. This change also updates consumers of the generated code accordingly. Even though system calls end up getting renumbered, this won't cause any problems in practice. CloudABI programs always call into the kernel through a kernel-supplied vDSO that has the numbers updated as well. Obtained from: https://github.com/NuxiNL/cloudabi
2017-07-26 06:57:15 +00:00
cloudabi_fd_t *, size_t, cloudabi_riflags_t, size_t *, size_t *,
cloudabi_roflags_t *);
Make file descriptor passing work for CloudABI's sendmsg(). Reduce the potential amount of code duplication between cloudabi32 and cloudabi64 by creating a cloudabi_sock_recv() utility function. The cloudabi32 and cloudabi64 modules will then only contain code to convert the iovecs to the native pointer size. In cloudabi_sock_recv(), we can now construct an SCM_RIGHTS cmsghdr in an mbuf and pass that on to kern_sendit().
2017-03-22 06:43:10 +00:00
int cloudabi_sock_send(struct thread *, cloudabi_fd_t, struct iovec *, size_t,
Upgrade to the latest sources generated from the CloudABI specification. The CloudABI specification has had some minor changes over the last half year. No substantial features have been added, but some features that are deemed unnecessary in retrospect have been removed: - mlock()/munlock(): These calls tend to be used for two different purposes: real-time support and handling of sensitive (cryptographic) material that shouldn't end up in swap. The former use case is out of scope for CloudABI. The latter may also be handled by encrypting swap. Removing this has the advantage that we no longer need to worry about having resource limits put in place. - SOCK_SEQPACKET: Support for SOCK_SEQPACKET is rather inconsistent across various operating systems. Some operating systems supported by CloudABI (e.g., macOS) don't support it at all. Considering that they are rarely used, remove support for the time being. - getsockname(), getpeername(), etc.: A shortcoming of the sockets API is that it doesn't allow you to create socket(pair)s, having fake socket addresses associated with them. This makes it harder to test applications or transparently forward (proxy) connections to them. With CloudABI, we're slowly moving networking connectivity into a separate daemon called Flower. In addition to passing around socket file descriptors, this daemon provides address information in the form of arbitrary string labels. There is thus no longer any need for requesting socket address information from the kernel itself. This change also updates consumers of the generated code accordingly. Even though system calls end up getting renumbered, this won't cause any problems in practice. CloudABI programs always call into the kernel through a kernel-supplied vDSO that has the numbers updated as well. Obtained from: https://github.com/NuxiNL/cloudabi
2017-07-26 06:57:15 +00:00
const cloudabi_fd_t *, size_t, size_t *);
Make file descriptor passing work for CloudABI's sendmsg(). Reduce the potential amount of code duplication between cloudabi32 and cloudabi64 by creating a cloudabi_sock_recv() utility function. The cloudabi32 and cloudabi64 modules will then only contain code to convert the iovecs to the native pointer size. In cloudabi_sock_recv(), we can now construct an SCM_RIGHTS cmsghdr in an mbuf and pass that on to kern_sendit().
2017-03-22 06:43:10 +00:00
Provide the CloudABI vDSO to its executables. CloudABI executables already provide support for passing in vDSOs. This functionality is used by the emulator for OS X to inject system call handlers. On FreeBSD, we could use it to optimize calls to gettimeofday(), etc. Though I don't have any plans to optimize any system calls right now, let's go ahead and already pass in a vDSO. This will allow us to simplify the executables, as the traditional "syscall" shims can be removed entirely. It also means that we gain more flexibility with regards to adding and removing system calls. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D7438
2016-08-10 21:02:41 +00:00
/* vDSO setup and teardown. */
void cloudabi_vdso_init(struct sysentvec *, char *, char *);
void cloudabi_vdso_destroy(struct sysentvec *);
Add a sysentvec for CloudABI on x86-64. Summary: For CloudABI we need to put two things on the stack of new processes: the argument data (a binary blob; not strings) and a startup data structure. The startup data structure contains interesting things such as a pointer to the ELF program header, the thread ID of the initial thread, a stack smashing protection canary, and a pointer to the argument data. Fetching system call arguments and setting the return value is similar to FreeBSD. The only differences are that system call 0 does not exist and that we call into cloudabi_convert_errno() to convert the error code. We also need this function in a couple of other places, so we'd better reuse it here. Reviewers: dchagin, kib Reviewed By: kib Subscribers: imp Differential Revision: https://reviews.freebsd.org/D3098
2015-07-16 18:24:06 +00:00
#endif
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