mirror of
https://github.com/RGBCube/serenity
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1d621ab172
This adds support for FUTEX_WAKE_OP, FUTEX_WAIT_BITSET, FUTEX_WAKE_BITSET, FUTEX_REQUEUE, and FUTEX_CMP_REQUEUE, as well well as global and private futex and absolute/relative timeouts against the appropriate clock. This also changes the implementation so that kernel resources are only used when a thread is blocked on a futex. Global futexes are implemented as offsets in VMObjects, so that different processes can share a futex against the same VMObject despite potentially being mapped at different virtual addresses.
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/API/Syscall.h>
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#include <errno.h>
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#include <serenity.h>
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extern "C" {
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int disown(pid_t pid)
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{
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int rc = syscall(SC_disown, pid);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int module_load(const char* path, size_t path_length)
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{
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int rc = syscall(SC_module_load, path, path_length);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int module_unload(const char* name, size_t name_length)
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{
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int rc = syscall(SC_module_unload, name, name_length);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int profiling_enable(pid_t pid)
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{
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int rc = syscall(SC_profiling_enable, pid);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int profiling_disable(pid_t pid)
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{
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int rc = syscall(SC_profiling_disable, pid);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int futex(uint32_t* userspace_address, int futex_op, uint32_t value, const struct timespec* timeout, uint32_t* userspace_address2, uint32_t value3)
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{
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int rc;
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switch (futex_op & FUTEX_CMD_MASK) {
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//case FUTEX_CMP_REQUEUE:
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// FUTEX_CMP_REQUEUE_PI:
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case FUTEX_WAKE_OP: {
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// These interpret timeout as a u32 value for val2
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Syscall::SC_futex_params params {
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.userspace_address = userspace_address,
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.futex_op = futex_op,
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.val = value,
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.val2 = (uint32_t)timeout,
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.userspace_address2 = userspace_address2,
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.val3 = value3
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};
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rc = syscall(SC_futex, ¶ms);
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break;
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}
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default: {
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Syscall::SC_futex_params params {
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.userspace_address = userspace_address,
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.futex_op = futex_op,
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.val = value,
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.timeout = timeout,
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.userspace_address2 = userspace_address2,
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.val3 = value3
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};
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rc = syscall(SC_futex, ¶ms);
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break;
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}
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}
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int purge(int mode)
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{
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int rc = syscall(SC_purge, mode);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int perf_event(int type, uintptr_t arg1, FlatPtr arg2)
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{
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int rc = syscall(SC_perf_event, type, arg1, arg2);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size)
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{
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int rc = syscall(SC_get_stack_bounds, user_stack_base, user_stack_size);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int anon_create(size_t size, int options)
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{
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int rc = syscall(SC_anon_create, size, options);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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