scoutos / prex-0.9.0 / sys / kern / sysent.c @ 03e9c04a
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/*-
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* Copyright (c) 2005-2009 Kohsuke Ohtani
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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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* 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. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* sysent.c - system call switch table.
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*/
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#include <kernel.h> |
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#include <thread.h> |
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#include <timer.h> |
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#include <vm.h> |
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#include <task.h> |
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#include <exception.h> |
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#include <ipc.h> |
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#include <device.h> |
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#include <sync.h> |
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#include <system.h> |
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typedef register_t (*sysfn_t)(register_t, register_t, register_t, register_t);
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#ifdef DEBUG
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static void strace_entry(register_t, register_t, register_t, register_t, |
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register_t); |
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static void strace_return(register_t, register_t); |
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#endif
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struct sysent {
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#ifdef DEBUG
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int sy_narg; /* number of arguments */ |
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char *sy_name; /* name string */ |
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#endif
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sysfn_t sy_call; /* handler */
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}; |
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/*
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* Sysent initialization macros.
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*
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* Initialization macro for system calls which take their args
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* in the C style. In order to reduce the memory space, we
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* store the syscall name and its argument count only when
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* DEBUG is defined.
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*
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*/
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#ifdef DEBUG
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#define SYSENT(n, fn) {n, __STRING(fn), (sysfn_t)(fn)}
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#else
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#define SYSENT(n, fn) {(sysfn_t)(fn)}
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#endif
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/*
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* This table is the switch used to transfer to the
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* appropriate routine for processing a system call.
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* The first element must be exception_return because
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* it requires special handling in HAL code.
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*/
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static const struct sysent sysent[] = { |
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/* 0 */ SYSENT(0, exception_return), |
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/* 1 */ SYSENT(1, exception_setup), |
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/* 2 */ SYSENT(2, exception_raise), |
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/* 3 */ SYSENT(1, exception_wait), |
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/* 4 */ SYSENT(3, task_create), |
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/* 5 */ SYSENT(1, task_terminate), |
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/* 6 */ SYSENT(0, task_self), |
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/* 7 */ SYSENT(1, task_suspend), |
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/* 8 */ SYSENT(1, task_resume), |
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/* 9 */ SYSENT(2, task_setname), |
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/* 10 */ SYSENT(2, task_setcap), |
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/* 11 */ SYSENT(2, task_chkcap), |
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/* 12 */ SYSENT(2, thread_create), |
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/* 13 */ SYSENT(1, thread_terminate), |
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/* 14 */ SYSENT(3, thread_load), |
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/* 15 */ SYSENT(0, thread_self), |
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/* 16 */ SYSENT(0, thread_yield), |
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/* 17 */ SYSENT(1, thread_suspend), |
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/* 18 */ SYSENT(1, thread_resume), |
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/* 19 */ SYSENT(3, thread_schedparam), |
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/* 20 */ SYSENT(4, vm_allocate), |
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/* 21 */ SYSENT(2, vm_free), |
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/* 22 */ SYSENT(3, vm_attribute), |
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/* 23 */ SYSENT(4, vm_map), |
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/* 24 */ SYSENT(2, object_create), |
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/* 25 */ SYSENT(1, object_destroy), |
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/* 26 */ SYSENT(2, object_lookup), |
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/* 27 */ SYSENT(3, msg_send), |
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/* 28 */ SYSENT(3, msg_receive), |
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/* 29 */ SYSENT(3, msg_reply), |
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/* 30 */ SYSENT(2, timer_sleep), |
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/* 31 */ SYSENT(2, timer_alarm), |
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/* 32 */ SYSENT(3, timer_periodic), |
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/* 33 */ SYSENT(0, timer_waitperiod), |
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/* 34 */ SYSENT(3, device_open), |
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/* 35 */ SYSENT(1, device_close), |
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/* 36 */ SYSENT(4, device_read), |
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/* 37 */ SYSENT(4, device_write), |
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/* 38 */ SYSENT(3, device_ioctl), |
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/* 39 */ SYSENT(1, mutex_init), |
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/* 40 */ SYSENT(1, mutex_destroy), |
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/* 41 */ SYSENT(1, mutex_lock), |
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/* 42 */ SYSENT(1, mutex_trylock), |
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/* 43 */ SYSENT(1, mutex_unlock), |
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/* 44 */ SYSENT(1, cond_init), |
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/* 45 */ SYSENT(1, cond_destroy), |
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/* 46 */ SYSENT(2, cond_wait), |
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/* 47 */ SYSENT(1, cond_signal), |
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/* 48 */ SYSENT(1, cond_broadcast), |
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/* 49 */ SYSENT(2, sem_init), |
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/* 50 */ SYSENT(1, sem_destroy), |
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/* 51 */ SYSENT(2, sem_wait), |
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/* 52 */ SYSENT(1, sem_trywait), |
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/* 53 */ SYSENT(1, sem_post), |
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/* 54 */ SYSENT(2, sem_getvalue), |
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/* 55 */ SYSENT(1, sys_log), |
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/* 56 */ SYSENT(1, sys_panic), |
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/* 57 */ SYSENT(2, sys_info), |
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/* 58 */ SYSENT(1, sys_time), |
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/* 59 */ SYSENT(2, sys_debug), |
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}; |
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#define NSYSCALL (int)(sizeof(sysent) / sizeof(sysent[0])) |
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/*
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* System call dispatcher.
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*/
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register_t |
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syscall_handler(register_t a1, register_t a2, register_t a3, register_t a4, |
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register_t id) |
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{ |
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register_t retval = EINVAL; |
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const struct sysent *callp; |
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#ifdef DEBUG
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strace_entry(a1, a2, a3, a4, id); |
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#endif
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if (id < NSYSCALL) {
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callp = &sysent[id]; |
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retval = (*callp->sy_call)(a1, a2, a3, a4); |
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} |
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#ifdef DEBUG
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strace_return(retval, id); |
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#endif
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return retval;
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} |
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#ifdef DEBUG
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/*
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* Show syscall info if the task is being traced.
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*/
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static void |
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strace_entry(register_t a1, register_t a2, register_t a3, register_t a4, |
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register_t id) |
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{ |
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const struct sysent *callp; |
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if (curtask->flags & TF_TRACE) {
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if (id >= NSYSCALL) {
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printf("%s: OUT OF RANGE (%d)\n",
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curtask->name, id); |
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return;
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} |
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callp = &sysent[id]; |
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printf("%s: %s(", curtask->name, callp->sy_name);
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switch (callp->sy_narg) {
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case 0: |
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printf(")\n");
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break;
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case 1: |
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printf("0x%08x)\n", a1);
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break;
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case 2: |
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printf("0x%08x, 0x%08x)\n", a1, a2);
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break;
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case 3: |
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printf("0x%08x, 0x%08x, 0x%08x)\n",
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a1, a2, a3); |
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break;
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case 4: |
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x)\n",
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a1, a2, a3, a4); |
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break;
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} |
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} |
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} |
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/*
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* Show status if syscall is failed.
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*
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* We ignore the return code for the function which does
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* not have any arguments, although timer_waitperiod()
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* has valid return code...
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*/
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static void |
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strace_return(register_t retval, register_t id) |
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{ |
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const struct sysent *callp; |
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if (curtask->flags & TF_TRACE) {
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if (id >= NSYSCALL)
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return;
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callp = &sysent[id]; |
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if (callp->sy_narg != 0 && retval != 0) |
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printf("%s: !!! %s() = 0x%08x\n",
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curtask->name, callp->sy_name, retval); |
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} |
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} |
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#endif /* !DEBUG */ |