/tags/0.2.0.3/kernel/generic/src/syscall/copy.c |
---|
0,0 → 1,132 |
/* |
* Copyright (C) 2006 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - 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. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. |
*/ |
/** @addtogroup generic |
* @{ |
*/ |
/** |
* @file |
* @brief Copying between kernel and userspace. |
* |
* This file contains sanitized functions for copying data |
* between kernel and userspace. |
*/ |
#include <syscall/copy.h> |
#include <proc/thread.h> |
#include <mm/as.h> |
#include <macros.h> |
#include <arch.h> |
#include <errno.h> |
#include <typedefs.h> |
/** Copy data from userspace to kernel. |
* |
* Provisions are made to return value even after page fault. |
* |
* This function can be called only from syscall. |
* |
* @param dst Destination kernel address. |
* @param uspace_src Source userspace address. |
* @param size Size of the data to be copied. |
* |
* @return 0 on success or error code from @ref errno.h. |
*/ |
int copy_from_uspace(void *dst, const void *uspace_src, size_t size) |
{ |
ipl_t ipl; |
int rc; |
ASSERT(THREAD); |
ASSERT(!THREAD->in_copy_from_uspace); |
if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
if (overlaps((uintptr_t) uspace_src, size, |
KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
/* |
* The userspace source block conflicts with kernel address space. |
*/ |
return EPERM; |
} |
} |
ipl = interrupts_disable(); |
THREAD->in_copy_from_uspace = true; |
rc = memcpy_from_uspace(dst, uspace_src, size); |
THREAD->in_copy_from_uspace = false; |
interrupts_restore(ipl); |
return !rc ? EPERM : 0; |
} |
/** Copy data from kernel to userspace. |
* |
* Provisions are made to return value even after page fault. |
* |
* This function can be called only from syscall. |
* |
* @param uspace_dst Destination userspace address. |
* @param src Source kernel address. |
* @param size Size of the data to be copied. |
* |
* @return 0 on success or error code from @ref errno.h. |
*/ |
int copy_to_uspace(void *uspace_dst, const void *src, size_t size) |
{ |
ipl_t ipl; |
int rc; |
ASSERT(THREAD); |
ASSERT(!THREAD->in_copy_from_uspace); |
if (!KERNEL_ADDRESS_SPACE_SHADOWED) { |
if (overlaps((uintptr_t) uspace_dst, size, |
KERNEL_ADDRESS_SPACE_START, KERNEL_ADDRESS_SPACE_END-KERNEL_ADDRESS_SPACE_START)) { |
/* |
* The userspace destination block conflicts with kernel address space. |
*/ |
return EPERM; |
} |
} |
ipl = interrupts_disable(); |
THREAD->in_copy_from_uspace = true; |
rc = memcpy_to_uspace(uspace_dst, src, size); |
THREAD->in_copy_from_uspace = false; |
interrupts_restore(ipl); |
return !rc ? EPERM : 0; |
} |
/** @} |
*/ |
/tags/0.2.0.3/kernel/generic/src/syscall/syscall.c |
---|
0,0 → 1,164 |
/* |
* Copyright (C) 2005 Martin Decky |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - 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. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. |
*/ |
/** @addtogroup generic |
* @{ |
*/ |
/** |
* @file |
* @brief Syscall table and syscall wrappers. |
*/ |
#include <syscall/syscall.h> |
#include <proc/thread.h> |
#include <proc/task.h> |
#include <mm/as.h> |
#include <print.h> |
#include <putchar.h> |
#include <errno.h> |
#include <arch.h> |
#include <debug.h> |
#include <ipc/sysipc.h> |
#include <synch/futex.h> |
#include <ddi/ddi.h> |
#include <security/cap.h> |
#include <syscall/copy.h> |
#include <sysinfo/sysinfo.h> |
#include <console/console.h> |
#include <console/klog.h> |
/** Print using kernel facility |
* |
* Some simulators can print only through kernel. Userspace can use |
* this syscall to facilitate it. |
*/ |
static unative_t sys_io(int fd, const void * buf, size_t count) |
{ |
size_t i; |
char *data; |
int rc; |
if (count > PAGE_SIZE) |
return ELIMIT; |
data = malloc(count, 0); |
if (!data) |
return ENOMEM; |
rc = copy_from_uspace(data, buf, count); |
if (rc) { |
free(data); |
return rc; |
} |
for (i = 0; i < count; i++) |
putchar(data[i]); |
free(data); |
return count; |
} |
/** Tell kernel to get keyboard/console access again */ |
static unative_t sys_debug_enable_console(void) |
{ |
arch_grab_console(); |
return 0; |
} |
/** Dispatch system call */ |
unative_t syscall_handler(unative_t a1, unative_t a2, unative_t a3, |
unative_t a4, unative_t id) |
{ |
unative_t rc; |
if (id < SYSCALL_END) |
rc = syscall_table[id](a1,a2,a3,a4); |
else { |
klog_printf("TASK %lld: Unknown syscall id %d",TASK->taskid,id); |
task_kill(TASK->taskid); |
thread_exit(); |
} |
if (THREAD->interrupted) |
thread_exit(); |
return rc; |
} |
syshandler_t syscall_table[SYSCALL_END] = { |
sys_io, |
sys_tls_set, |
/* Thread and task related syscalls. */ |
sys_thread_create, |
sys_thread_exit, |
sys_task_get_id, |
/* Synchronization related syscalls. */ |
sys_futex_sleep_timeout, |
sys_futex_wakeup, |
/* Address space related syscalls. */ |
sys_as_area_create, |
sys_as_area_resize, |
sys_as_area_destroy, |
/* IPC related syscalls. */ |
sys_ipc_call_sync_fast, |
sys_ipc_call_sync, |
sys_ipc_call_async_fast, |
sys_ipc_call_async, |
sys_ipc_answer_fast, |
sys_ipc_answer, |
sys_ipc_forward_fast, |
sys_ipc_wait_for_call, |
sys_ipc_hangup, |
sys_ipc_register_irq, |
sys_ipc_unregister_irq, |
/* Capabilities related syscalls. */ |
sys_cap_grant, |
sys_cap_revoke, |
/* DDI related syscalls. */ |
sys_physmem_map, |
sys_iospace_enable, |
sys_preempt_control, |
/* Sysinfo syscalls */ |
sys_sysinfo_valid, |
sys_sysinfo_value, |
/* Debug calls */ |
sys_debug_enable_console |
}; |
/** @} |
*/ |