592 lines
22 KiB
C
592 lines
22 KiB
C
/* This task handles the interface between the kernel and user-level servers.
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* System services can be accessed by doing a system call. System calls are
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* transformed into request messages, which are handled by this task. By
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* convention, a sys_call() is transformed in a SYS_CALL request message that
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* is handled in a function named do_call().
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*
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* A private call vector is used to map all system calls to the functions that
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* handle them. The actual handler functions are contained in separate files
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* to keep this file clean. The call vector is used in the system task's main
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* loop to handle all incoming requests.
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*
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* In addition to the main sys_task() entry point, which starts the main loop,
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* there are several other minor entry points:
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* get_priv: assign privilege structure to user or system process
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* set_sendto_bit: allow a process to send messages to a new target
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* unset_sendto_bit: disallow a process from sending messages to a target
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* send_sig: send a signal directly to a system process
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* cause_sig: take action to cause a signal to occur via PM
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* sig_delay_done: tell PM that a process is not sending
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* umap_bios: map virtual address in BIOS_SEG to physical
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* get_randomness: accumulate randomness in a buffer
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* clear_endpoint: remove a process' ability to send and receive messages
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*
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* Changes:
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* Nov 22, 2009 get_priv supports static priv ids (Cristiano Giuffrida)
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* Aug 04, 2005 check if system call is allowed (Jorrit N. Herder)
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* Jul 20, 2005 send signal to services with message (Jorrit N. Herder)
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* Jan 15, 2005 new, generalized virtual copy function (Jorrit N. Herder)
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* Oct 10, 2004 dispatch system calls from call vector (Jorrit N. Herder)
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* Sep 30, 2004 source code documentation updated (Jorrit N. Herder)
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*/
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#include "debug.h"
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#include "kernel.h"
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#include "system.h"
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#include "proc.h"
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#include "vm.h"
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/sigcontext.h>
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#include <minix/endpoint.h>
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#include <minix/safecopies.h>
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#include <minix/portio.h>
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/* Declaration of the call vector that defines the mapping of system calls
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* to handler functions. The vector is initialized in sys_init() with map(),
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* which makes sure the system call numbers are ok. No space is allocated,
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* because the dummy is declared extern. If an illegal call is given, the
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* array size will be negative and this won't compile.
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*/
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PUBLIC int (*call_vec[NR_SYS_CALLS])(message *m_ptr);
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char *callnames[NR_SYS_CALLS];
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#define map(call_nr, handler) \
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{extern int dummy[NR_SYS_CALLS>(unsigned)(call_nr-KERNEL_CALL) ? 1:-1];} \
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callnames[(call_nr-KERNEL_CALL)] = #call_nr; \
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call_vec[(call_nr-KERNEL_CALL)] = (handler)
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FORWARD _PROTOTYPE( void initialize, (void));
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FORWARD _PROTOTYPE( struct proc *vmrestart_check, (message *));
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/*===========================================================================*
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* sys_task *
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*===========================================================================*/
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PUBLIC void sys_task()
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{
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/* Main entry point of sys_task. Get the message and dispatch on type. */
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static message m;
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register int result;
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register struct proc *caller_ptr;
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int s;
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int call_nr;
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/* Initialize the system task. */
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initialize();
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while (TRUE) {
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struct proc *restarting;
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restarting = vmrestart_check(&m);
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if(!restarting) {
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int r;
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/* Get work. Block and wait until a request message arrives. */
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if((r=receive(ANY, &m)) != OK)
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minix_panic("receive() failed", r);
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}
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sys_call_code = (unsigned) m.m_type;
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call_nr = sys_call_code - KERNEL_CALL;
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who_e = m.m_source;
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okendpt(who_e, &who_p);
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caller_ptr = proc_addr(who_p);
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/* See if the caller made a valid request and try to handle it. */
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if (call_nr < 0 || call_nr >= NR_SYS_CALLS) { /* check call number */
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kprintf("SYSTEM: illegal request %d from %d.\n",
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call_nr,m.m_source);
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result = EBADREQUEST; /* illegal message type */
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}
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else if (!GET_BIT(priv(caller_ptr)->s_k_call_mask, call_nr)) {
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result = ECALLDENIED; /* illegal message type */
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}
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else {
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result = (*call_vec[call_nr])(&m); /* handle the system call */
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}
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if(result == VMSUSPEND) {
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/* Special case: message has to be saved for handling
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* until VM tells us it's allowed. VM has been notified
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* and we must wait for its reply to restart the call.
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*/
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vmassert(RTS_ISSET(caller_ptr, RTS_VMREQUEST));
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vmassert(caller_ptr->p_vmrequest.type == VMSTYPE_KERNELCALL);
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caller_ptr->p_vmrequest.saved.reqmsg = m;
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} else if (result != EDONTREPLY) {
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/* Send a reply, unless inhibited by a handler function.
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* Use the kernel function lock_send() to prevent a system
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* call trap.
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*/
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if(restarting) {
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vmassert(!RTS_ISSET(restarting, RTS_VMREQUEST));
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#if 0
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vmassert(!RTS_ISSET(restarting, RTS_VMREQTARGET));
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#endif
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}
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m.m_type = result; /* report status of call */
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if(WILLRECEIVE(caller_ptr, SYSTEM)) {
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if (OK != (s=lock_send(m.m_source, &m))) {
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kprintf("SYSTEM, reply to %d failed: %d\n",
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m.m_source, s);
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}
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} else {
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kprintf("SYSTEM: not replying to %d; not ready\n",
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caller_ptr->p_endpoint);
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}
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}
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}
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}
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/*===========================================================================*
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* initialize *
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*===========================================================================*/
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PRIVATE void initialize(void)
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{
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register struct priv *sp;
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int i;
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/* Initialize IRQ handler hooks. Mark all hooks available. */
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for (i=0; i<NR_IRQ_HOOKS; i++) {
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irq_hooks[i].proc_nr_e = NONE;
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}
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/* Initialize all alarm timers for all processes. */
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for (sp=BEG_PRIV_ADDR; sp < END_PRIV_ADDR; sp++) {
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tmr_inittimer(&(sp->s_alarm_timer));
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}
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/* Initialize the call vector to a safe default handler. Some system calls
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* may be disabled or nonexistant. Then explicitely map known calls to their
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* handler functions. This is done with a macro that gives a compile error
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* if an illegal call number is used. The ordering is not important here.
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*/
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for (i=0; i<NR_SYS_CALLS; i++) {
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call_vec[i] = do_unused;
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callnames[i] = "unused";
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}
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/* Process management. */
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map(SYS_FORK, do_fork); /* a process forked a new process */
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map(SYS_EXEC, do_exec); /* update process after execute */
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map(SYS_EXIT, do_exit); /* clean up after process exit */
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map(SYS_NICE, do_nice); /* set scheduling priority */
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map(SYS_PRIVCTL, do_privctl); /* system privileges control */
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map(SYS_TRACE, do_trace); /* request a trace operation */
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map(SYS_SETGRANT, do_setgrant); /* get/set own parameters */
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map(SYS_RUNCTL, do_runctl); /* set/clear stop flag of a process */
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/* Signal handling. */
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map(SYS_KILL, do_kill); /* cause a process to be signaled */
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map(SYS_GETKSIG, do_getksig); /* PM checks for pending signals */
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map(SYS_ENDKSIG, do_endksig); /* PM finished processing signal */
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map(SYS_SIGSEND, do_sigsend); /* start POSIX-style signal */
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map(SYS_SIGRETURN, do_sigreturn); /* return from POSIX-style signal */
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/* Device I/O. */
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map(SYS_IRQCTL, do_irqctl); /* interrupt control operations */
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map(SYS_DEVIO, do_devio); /* inb, inw, inl, outb, outw, outl */
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map(SYS_VDEVIO, do_vdevio); /* vector with devio requests */
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/* Memory management. */
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map(SYS_NEWMAP, do_newmap); /* set up a process memory map */
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map(SYS_SEGCTL, do_segctl); /* add segment and get selector */
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map(SYS_MEMSET, do_memset); /* write char to memory area */
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map(SYS_VMCTL, do_vmctl); /* various VM process settings */
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/* Copying. */
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map(SYS_UMAP, do_umap); /* map virtual to physical address */
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map(SYS_VIRCOPY, do_vircopy); /* use pure virtual addressing */
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map(SYS_PHYSCOPY, do_copy); /* use physical addressing */
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map(SYS_SAFECOPYFROM, do_safecopy); /* copy with pre-granted permission */
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map(SYS_SAFECOPYTO, do_safecopy); /* copy with pre-granted permission */
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map(SYS_VSAFECOPY, do_vsafecopy); /* vectored safecopy */
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/* Mapping. */
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map(SYS_SAFEMAP, do_safemap); /* map pages from other process */
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map(SYS_SAFEREVMAP, do_saferevmap); /* grantor revokes the map grant */
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map(SYS_SAFEUNMAP, do_safeunmap); /* requestor unmaps the mapped pages */
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/* Clock functionality. */
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map(SYS_TIMES, do_times); /* get uptime and process times */
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map(SYS_SETALARM, do_setalarm); /* schedule a synchronous alarm */
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map(SYS_STIME, do_stime); /* set the boottime */
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map(SYS_VTIMER, do_vtimer); /* set or retrieve a virtual timer */
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/* System control. */
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map(SYS_ABORT, do_abort); /* abort MINIX */
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map(SYS_GETINFO, do_getinfo); /* request system information */
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map(SYS_SYSCTL, do_sysctl); /* misc system manipulation */
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/* Profiling. */
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map(SYS_SPROF, do_sprofile); /* start/stop statistical profiling */
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map(SYS_CPROF, do_cprofile); /* get/reset call profiling data */
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map(SYS_PROFBUF, do_profbuf); /* announce locations to kernel */
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/* i386-specific. */
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#if _MINIX_CHIP == _CHIP_INTEL
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map(SYS_INT86, do_int86); /* real-mode BIOS calls */
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map(SYS_READBIOS, do_readbios); /* read from BIOS locations */
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map(SYS_IOPENABLE, do_iopenable); /* Enable I/O */
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map(SYS_SDEVIO, do_sdevio); /* phys_insb, _insw, _outsb, _outsw */
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#endif
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}
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/*===========================================================================*
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* get_priv *
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*===========================================================================*/
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PUBLIC int get_priv(rc, priv_id)
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register struct proc *rc; /* new (child) process pointer */
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int priv_id; /* privilege id */
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{
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/* Allocate a new privilege structure for a system process. Privilege ids
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* can be assigned either statically or dynamically.
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*/
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register struct priv *sp; /* privilege structure */
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if(priv_id == NULL_PRIV_ID) { /* allocate slot dynamically */
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for (sp = BEG_DYN_PRIV_ADDR; sp < END_DYN_PRIV_ADDR; ++sp)
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if (sp->s_proc_nr == NONE) break;
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if (sp >= END_DYN_PRIV_ADDR) return(ENOSPC);
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}
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else { /* allocate slot from id */
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if(!is_static_priv_id(priv_id)) {
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return EINVAL; /* invalid static priv id */
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}
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if(priv[priv_id].s_proc_nr != NONE) {
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return EBUSY; /* slot already in use */
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}
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sp = &priv[priv_id];
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}
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rc->p_priv = sp; /* assign new slot */
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rc->p_priv->s_proc_nr = proc_nr(rc); /* set association */
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return(OK);
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}
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/*===========================================================================*
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* set_sendto_bit *
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*===========================================================================*/
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PUBLIC void set_sendto_bit(struct proc *rp, int id)
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{
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/* Allow a process to send messages to the process(es) associated with the
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* system privilege structure with the given ID.
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*/
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/* Disallow the process from sending to a process privilege structure with no
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* associated process, and disallow the process from sending to itself.
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*/
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if (id_to_nr(id) == NONE || priv_id(rp) == id) {
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unset_sys_bit(priv(rp)->s_ipc_to, id);
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return;
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}
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set_sys_bit(priv(rp)->s_ipc_to, id);
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/* The process that this process can now send to, must be able to reply (or
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* vice versa). Therefore, its send mask should be updated as well. Ignore
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* receivers that don't support traps other than RECEIVE, they can't reply
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* or send messages anyway.
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*/
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if (priv_addr(id)->s_trap_mask & ~((1 << RECEIVE)))
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set_sys_bit(priv_addr(id)->s_ipc_to, priv_id(rp));
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}
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/*===========================================================================*
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* unset_sendto_bit *
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*===========================================================================*/
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PUBLIC void unset_sendto_bit(struct proc *rp, int id)
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{
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/* Prevent a process from sending to another process. Retain the send mask
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* symmetry by also unsetting the bit for the other direction.
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*/
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unset_sys_bit(priv(rp)->s_ipc_to, id);
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unset_sys_bit(priv_addr(id)->s_ipc_to, priv_id(rp));
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}
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/*===========================================================================*
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* send_sig *
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*===========================================================================*/
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PUBLIC void send_sig(int proc_nr, int sig_nr)
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{
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/* Notify a system process about a signal. This is straightforward. Simply
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* set the signal that is to be delivered in the pending signals map and
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* send a notification with source SYSTEM.
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*/
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register struct proc *rp;
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static int n;
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if(!isokprocn(proc_nr) || isemptyn(proc_nr))
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minix_panic("send_sig to empty process", proc_nr);
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rp = proc_addr(proc_nr);
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sigaddset(&priv(rp)->s_sig_pending, sig_nr);
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if(!intr_disabled()) {
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lock_notify(SYSTEM, rp->p_endpoint);
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} else {
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mini_notify(proc_addr(SYSTEM), rp->p_endpoint);
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}
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}
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/*===========================================================================*
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* cause_sig *
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*===========================================================================*/
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PUBLIC void cause_sig(proc_nr, sig_nr)
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proc_nr_t proc_nr; /* process to be signalled */
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int sig_nr; /* signal to be sent */
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{
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/* A system process wants to send a signal to a process. Examples are:
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* - HARDWARE wanting to cause a SIGSEGV after a CPU exception
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* - TTY wanting to cause SIGINT upon getting a DEL
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* - FS wanting to cause SIGPIPE for a broken pipe
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* Signals are handled by sending a message to PM. This function handles the
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* signals and makes sure the PM gets them by sending a notification. The
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* process being signaled is blocked while PM has not finished all signals
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* for it.
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* Race conditions between calls to this function and the system calls that
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* process pending kernel signals cannot exist. Signal related functions are
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* only called when a user process causes a CPU exception and from the kernel
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* process level, which runs to completion.
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*/
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register struct proc *rp;
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if (proc_nr == PM_PROC_NR)
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minix_panic("cause_sig: PM gets signal", NO_NUM);
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/* Check if the signal is already pending. Process it otherwise. */
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rp = proc_addr(proc_nr);
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if (! sigismember(&rp->p_pending, sig_nr)) {
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sigaddset(&rp->p_pending, sig_nr);
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if (! (RTS_ISSET(rp, RTS_SIGNALED))) { /* other pending */
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RTS_LOCK_SET(rp, RTS_SIGNALED | RTS_SIG_PENDING);
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send_sig(PM_PROC_NR, SIGKSIG);
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}
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}
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}
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/*===========================================================================*
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* sig_delay_done *
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*===========================================================================*/
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PUBLIC void sig_delay_done(rp)
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struct proc *rp;
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{
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/* A process is now known not to send any direct messages.
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* Tell PM that the stop delay has ended, by sending a signal to the process.
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* Used for actual signal delivery.
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*/
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rp->p_misc_flags &= ~MF_SIG_DELAY;
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cause_sig(proc_nr(rp), SIGNDELAY);
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}
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#if _MINIX_CHIP == _CHIP_INTEL
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/*===========================================================================*
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* umap_bios *
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*===========================================================================*/
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PUBLIC phys_bytes umap_bios(vir_addr, bytes)
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vir_bytes vir_addr; /* virtual address in BIOS segment */
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vir_bytes bytes; /* # of bytes to be copied */
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{
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/* Calculate the physical memory address at the BIOS. Note: currently, BIOS
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* address zero (the first BIOS interrupt vector) is not considered as an
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* error here, but since the physical address will be zero as well, the
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* calling function will think an error occurred. This is not a problem,
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* since no one uses the first BIOS interrupt vector.
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*/
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/* Check all acceptable ranges. */
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if (vir_addr >= BIOS_MEM_BEGIN && vir_addr + bytes <= BIOS_MEM_END)
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return (phys_bytes) vir_addr;
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else if (vir_addr >= BASE_MEM_TOP && vir_addr + bytes <= UPPER_MEM_END)
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return (phys_bytes) vir_addr;
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kprintf("Warning, error in umap_bios, virtual address 0x%x\n", vir_addr);
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return 0;
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}
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#endif
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/*===========================================================================*
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* umap_grant *
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*===========================================================================*/
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PUBLIC phys_bytes umap_grant(rp, grant, bytes)
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struct proc *rp; /* pointer to proc table entry for process */
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cp_grant_id_t grant; /* grant no. */
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vir_bytes bytes; /* size */
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{
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int proc_nr;
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vir_bytes offset, ret;
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endpoint_t granter;
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/* See if the grant in that process is sensible, and
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* find out the virtual address and (optionally) new
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* process for that address.
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*
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* Then convert that process to a slot number.
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*/
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if(verify_grant(rp->p_endpoint, ANY, grant, bytes, 0, 0,
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&offset, &granter) != OK) {
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kprintf("SYSTEM: umap_grant: verify_grant failed\n");
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return 0;
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}
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if(!isokendpt(granter, &proc_nr)) {
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kprintf("SYSTEM: umap_grant: isokendpt failed\n");
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return 0;
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}
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/* Do the mapping from virtual to physical. */
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ret = umap_virtual(proc_addr(proc_nr), D, offset, bytes);
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if(!ret) {
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kprintf("SYSTEM:umap_grant:umap_virtual failed; grant %s:%d -> %s: vir 0x%lx\n",
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rp->p_name, grant,
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proc_addr(proc_nr)->p_name, offset);
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}
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return ret;
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}
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/*===========================================================================*
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* clear_endpoint *
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*===========================================================================*/
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PUBLIC void clear_endpoint(rc)
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register struct proc *rc; /* slot of process to clean up */
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{
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register struct proc *rp; /* iterate over process table */
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register struct proc **xpp; /* iterate over caller queue */
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if(isemptyp(rc)) minix_panic("clear_proc: empty process", rc->p_endpoint);
|
|
|
|
if(rc->p_endpoint == PM_PROC_NR || rc->p_endpoint == VFS_PROC_NR ||
|
|
rc->p_endpoint == VM_PROC_NR)
|
|
{
|
|
/* This test is great for debugging system processes dying,
|
|
* but as this happens normally on reboot, not good permanent code.
|
|
*/
|
|
kprintf("died: ");
|
|
proc_stacktrace(rc);
|
|
minix_panic("system process died", rc->p_endpoint);
|
|
}
|
|
|
|
/* Make sure that the exiting process is no longer scheduled. */
|
|
RTS_LOCK_SET(rc, RTS_NO_ENDPOINT);
|
|
if (priv(rc)->s_flags & SYS_PROC)
|
|
{
|
|
if (priv(rc)->s_asynsize) {
|
|
#if 0
|
|
kprintf("clear_endpoint: clearing s_asynsize of %s / %d\n",
|
|
rc->p_name, rc->p_endpoint);
|
|
proc_stacktrace(rc);
|
|
#endif
|
|
}
|
|
priv(rc)->s_asynsize= 0;
|
|
}
|
|
|
|
/* If the process happens to be queued trying to send a
|
|
* message, then it must be removed from the message queues.
|
|
*/
|
|
if (RTS_ISSET(rc, RTS_SENDING)) {
|
|
int target_proc;
|
|
|
|
okendpt(rc->p_sendto_e, &target_proc);
|
|
xpp = &proc_addr(target_proc)->p_caller_q; /* destination's queue */
|
|
while (*xpp != NIL_PROC) { /* check entire queue */
|
|
if (*xpp == rc) { /* process is on the queue */
|
|
*xpp = (*xpp)->p_q_link; /* replace by next process */
|
|
#if DEBUG_ENABLE_IPC_WARNINGS
|
|
kprintf("endpoint %d / %s removed from queue at %d\n",
|
|
rc->p_endpoint, rc->p_name, rc->p_sendto_e);
|
|
#endif
|
|
break; /* can only be queued once */
|
|
}
|
|
xpp = &(*xpp)->p_q_link; /* proceed to next queued */
|
|
}
|
|
rc->p_rts_flags &= ~RTS_SENDING;
|
|
}
|
|
rc->p_rts_flags &= ~RTS_RECEIVING;
|
|
|
|
/* Likewise, if another process was sending or receive a message to or from
|
|
* the exiting process, it must be alerted that process no longer is alive.
|
|
* Check all processes.
|
|
*/
|
|
for (rp = BEG_PROC_ADDR; rp < END_PROC_ADDR; rp++) {
|
|
if(isemptyp(rp))
|
|
continue;
|
|
|
|
/* Unset pending notification bits. */
|
|
unset_sys_bit(priv(rp)->s_notify_pending, priv(rc)->s_id);
|
|
|
|
/* Check if process is receiving from exiting process. */
|
|
if (RTS_ISSET(rp, RTS_RECEIVING) && rp->p_getfrom_e == rc->p_endpoint) {
|
|
rp->p_reg.retreg = ESRCDIED; /* report source died */
|
|
RTS_LOCK_UNSET(rp, RTS_RECEIVING); /* no longer receiving */
|
|
#if DEBUG_ENABLE_IPC_WARNINGS
|
|
kprintf("endpoint %d / %s receiving from dead src ep %d / %s\n",
|
|
rp->p_endpoint, rp->p_name, rc->p_endpoint, rc->p_name);
|
|
#endif
|
|
}
|
|
if (RTS_ISSET(rp, RTS_SENDING) &&
|
|
rp->p_sendto_e == rc->p_endpoint) {
|
|
rp->p_reg.retreg = EDSTDIED; /* report destination died */
|
|
RTS_LOCK_UNSET(rp, RTS_SENDING);
|
|
#if DEBUG_ENABLE_IPC_WARNINGS
|
|
kprintf("endpoint %d / %s send to dying dst ep %d (%s)\n",
|
|
rp->p_endpoint, rp->p_name, rc->p_endpoint, rc->p_name);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* vmrestart_check *
|
|
*===========================================================================*/
|
|
PRIVATE struct proc *vmrestart_check(message *m)
|
|
{
|
|
int type;
|
|
struct proc *restarting;
|
|
|
|
/* Anyone waiting to be vm-restarted? */
|
|
|
|
if(!(restarting = vmrestart))
|
|
return NULL;
|
|
|
|
vmassert(!RTS_ISSET(restarting, RTS_SLOT_FREE));
|
|
vmassert(RTS_ISSET(restarting, RTS_VMREQUEST));
|
|
|
|
type = restarting->p_vmrequest.type;
|
|
restarting->p_vmrequest.type = VMSTYPE_SYS_NONE;
|
|
vmrestart = restarting->p_vmrequest.nextrestart;
|
|
|
|
switch(type) {
|
|
case VMSTYPE_KERNELCALL:
|
|
*m = restarting->p_vmrequest.saved.reqmsg;
|
|
restarting->p_vmrequest.saved.reqmsg.m_source = NONE;
|
|
vmassert(m->m_source == restarting->p_endpoint);
|
|
/* Original caller could've disappeared in the meantime. */
|
|
if(!isokendpt(m->m_source, &who_p)) {
|
|
kprintf("SYSTEM: ignoring call %d from dead %d\n",
|
|
m->m_type, m->m_source);
|
|
return NULL;
|
|
}
|
|
{ int i;
|
|
i = m->m_type - KERNEL_CALL;
|
|
if(i >= 0 && i < NR_SYS_CALLS) {
|
|
#if 0
|
|
kprintf("SYSTEM: restart %s from %d\n",
|
|
callnames[i], m->m_source);
|
|
#endif
|
|
} else {
|
|
minix_panic("call number out of range", i);
|
|
}
|
|
}
|
|
return restarting;
|
|
default:
|
|
minix_panic("strange restart type", type);
|
|
}
|
|
minix_panic("fell out of switch", NO_NUM);
|
|
}
|