minix/servers/vm/signal.c

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#define _SYSTEM 1
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <minix/keymap.h>
#include <minix/minlib.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/bitmap.h>
#include <sys/sigcontext.h>
#include <errno.h>
#include <env.h>
#include "glo.h"
#include "vm.h"
#include "proto.h"
#include "util.h"
#define DATA_CHANGED 1 /* flag value when data segment size changed */
#define STACK_CHANGED 2 /* flag value when stack size changed */
/*===========================================================================*
* do_push_sig *
*===========================================================================*/
PUBLIC int do_push_sig(message *msg)
{
int r, n;
endpoint_t ep;
vir_bytes sp;
struct vmproc *vmp;
ep = msg->VMPS_ENDPOINT;
if((r=vm_isokendpt(ep, &n)) != OK) {
printf("VM: bogus endpoint %d from %d\n", ep, msg->m_source);
return r;
}
vmp = &vmproc[n];
if ((r=get_stack_ptr(ep, &sp)) != OK)
panic("couldn't get new stack pointer (for sig): %d", r);
/* Save old SP for caller */
msg->VMPS_OLD_SP = (char *) sp;
/* Make room for the sigcontext and sigframe struct. */
sp -= sizeof(struct sigcontext)
+ 3 * sizeof(char *) + 2 * sizeof(int);
if ((r=adjust(vmp, vmp->vm_arch.vm_seg[D].mem_len, sp)) != OK) {
printf("VM: do_push_sig: adjust() failed: %d\n", r);
return r;
}
return OK;
}