void
enter_process(void *tf,unsigned long addr)
{
struct trapframe *childframe,child_tf;
struct addrspace *childspace;
if(tf!=NULL)
{
tf = (struct trapframe *) tf;
childframe = tf;
//copy the trapframe info now into the child_tf
// child_tf = *childframe;
memcpy(&child_tf,tf,sizeof(struct trapframe));
child_tf.tf_a3=0;
child_tf.tf_v0=0;
child_tf.tf_epc +=4;
pid_t parentid = (pid_t)addr;
if(process_array[curthread->t_pid]->parent_id!=parentid)
process_array[curthread->t_pid]->parent_id=parentid;
if(!(curthread->t_addrspace==NULL))
{
childspace = curthread->t_addrspace;
as_activate(childspace);
}
mips_usermode(&child_tf);
}
}
void md_forkentry(struct trapframe *tf,unsigned long addrspace_copy)
{
/*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
//(void)tf;
//kprintf("\n md_forkentry");
tf->tf_v0=0;
tf->tf_a3=0;
curthread->t_vmspace=(struct addrspace*)addrspace_copy;
if(curthread->t_vmspace!=NULL){
as_activate(curthread->t_vmspace);
}
//copy modified trap frame from kernel heap to stack
struct trapframe tf_temp=*tf;//=kmalloc(sizeof(struct trapframe));
tf_temp.tf_v0=tf->tf_v0;
tf_temp.tf_a0=tf->tf_a0;
tf_temp.tf_a1=tf->tf_a1;
tf_temp.tf_a2=tf->tf_a2;
tf_temp.tf_a3=tf->tf_a3;
tf->tf_epc+=4;
mips_usermode(&tf_temp);
}
void
md_forkentry(struct trapframe *tf, unsigned int vmspace)
{
struct trapframe child_kstack;
/* copy trapframe of parent to chile procss*/
memcpy(&child_kstack, tf, sizeof(struct trapframe));
/* release trapframe when allocated at function process*/
kfree(tf);
/* activate addrspace*/
as_activate((struct addrspace *)vmspace);
/* increment pc*/
child_kstack.tf_epc += 4;
child_kstack.tf_v0 = 0;
child_kstack.tf_a3 = 0;
/* release lock so that other process can execute process_fork*/
// lock_release(forklock);
/* execute chile process*/
mips_usermode(&child_kstack);
}
/* This is the entry point of the forked child process */
int
md_forkentry(void* tf, unsigned long vmspace)
{
// int spl = splhigh();
//kprintf(" process %d is in enter md_forkentry\n",curthread->pID);
struct trapframe child_tf;
struct trapframe *tf_parent = (struct trapframe*) tf;
assert(tf_parent != NULL);
// memcpy(child_tf, tf, sizeof(struct trapframe));
tf_parent->tf_epc += 4;
//we set the return value to be 0.
tf_parent->tf_v0 = 0;
tf_parent->tf_a3 = 0;
// Load Address Space of Child and Activate it.
curthread->t_vmspace = (struct addrspace*)vmspace;
assert(curthread->t_vmspace != NULL);
as_activate(curthread->t_vmspace);
child_tf = *tf_parent;
mips_usermode(&child_tf);
// we should never reach here
panic("switching to user mode returned\n");
return 0;
}
void
md_forkentry(struct trapframe *tf, unsigned long child_addr)
{
/*
this function is basically for the child thread, remember the threadfor in sys_fork, it calls the md_forkentry and passed in new TF and addressspace and the child_thread.
*/
//kprintf("just enter forkentry\n");
struct trapframe* modifiy_tf;
struct trapframe dumbvalue;
struct addrspace* new_addr = (struct addrspace*) child_addr;
modifiy_tf= kmalloc(sizeof(struct trapframe));
//kprintf("just enter memcpy modified tf and tf\n");
memcpy(modifiy_tf, tf, sizeof(struct trapframe));
//kprintf("just after memcpy modified tf and tf\n");
//*modifiy_tf = *tf;
modifiy_tf->tf_v0 = 0;
modifiy_tf->tf_a3 = 0;
modifiy_tf->tf_epc +=4;
curthread->t_vmspace = new_addr;
//activie the addressspace
//kprintf("activate thread -- pid: %d\n", curthread->t_pid);
as_activate(curthread->t_vmspace);
//memcpy(dumbvalue, tf, sizeof(struct trapframe));
//kprintf("just enter dumbvalue =*tf\n");
dumbvalue = *modifiy_tf;
//kprintf("just leave dumbvalue =*tf\n");
mips_usermode(&dumbvalue);
}
void
forkentry(void *tf, unsigned long child_addrs )
{
(void)child_addrs;
int *temp;
struct trapframe my_tf;
int s = splhigh();
if((curthread->errflag)==1){
splx(s);
sysexit(temp,tf);
}else{
//DEBUG(1,"forkentry %d\n",curthread->ppid);
memcpy(&my_tf, tf, sizeof(struct trapframe));
my_tf.tf_a3 = 0;
my_tf.tf_epc +=4;
my_tf.tf_v0 = 0;
splx(s);
kfree(tf);
mips_usermode(&my_tf);
}
}
void
md_forkentry(void * data1, unsigned long unused) {
//(void)unused;
struct fork_info * info = data1;
struct addrspace * new_as;
struct trapframe new_tf;
/* copy address space */
if (as_copy(info->parent->t_vmspace, &new_as)) {
info->child_pid = ENOMEM; // Means no memory for process
V(info->sem); // child is done, parent should resume.
thread_exit();
}
curthread->t_vmspace = new_as;
as_activate(new_as);
/* copy trap frame */
memcpy(&new_tf, info->tf, sizeof(struct trapframe));
/* change tf's registers to return values for syscall */
new_tf.tf_v0 = 0;
new_tf.tf_a3 = 0;
new_tf.tf_epc += 4;
/* create process and get the pid */
struct thread *new_process = kmalloc(sizeof(struct thread));
new_process->parent_pid = curthread->t_pid;
proc_table++;
new_process->t_pid = create_tpid();
proc_table++;
V(info->sem);
mips_usermode(&new_tf);
/* mips_usermode does not return */
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(struct trapframe *tf)
{
KASSERT(tf);
struct trapframe newtf=*tf;
kfree(tf);
newtf.tf_v0=0;
newtf.tf_a0=0;
newtf.tf_epc += 4;
mips_usermode(&newtf);
(void)tf;
}
/*
* md_usermode: go to user mode after loading an executable.
*
* Works by creating an ersatz trapframe and jumping into the middle
* of the exception return code.
*/
void
md_usermode(int argc, userptr_t argv, vaddr_t stack, vaddr_t entry)
{ struct trapframe tf;
bzero(&tf, sizeof(tf));
tf.tf_status = CST_IRQMASK | CST_IEp | CST_KUp;
tf.tf_epc = entry;
tf.tf_a0 = argc;
tf.tf_a1 = (vaddr_t)argv;
tf.tf_sp = stack;
mips_usermode(&tf);
}
/*
* Enter user mode for a newly forked process.
*
* Succeed and return 0 into userspace.
*/
void
enter_forked_process(struct trapframe *tf)
{
tf->tf_v0 = 0;
tf->tf_a3 = 0;
/*
* Advance the PC.
*/
tf->tf_epc += 4;
mips_usermode(tf);
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(struct trapframe *tf)
{
#if OPT_A2
struct trapframe temptrap;
memcpy(&temptrap, (void *)tf, sizeof(struct trapframe));
kfree(tf);
temptrap.tf_v0 = 0;
temptrap.tf_a3 = 0;
temptrap.tf_epc += 4;
mips_usermode(&temptrap);
#else
(void)tf;
#endif /* OPT_A2 */
}
//void entry_point(void* data1, unsigned long data2)
void enter_forked_process(void* data1, unsigned long data2)
{
//(void)tf;
//kprintf("hi1");
struct trapframe tf = (*(struct trapframe*) data1);
//struct trapframe new_tf;
//memcpy(&new_tf,tf, sizeof(struct trapframe));
//new_tf = *tf;
//(void) data2;
tf.tf_a3 = 0;
tf.tf_v0 = data2;
tf.tf_epc += 4;
//as_activate();
mips_usermode(&tf); //Enter user mode for newly forked process
//kprintf("hi2");
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(struct trapframe *tf)
{
//kprintf("enter_forked_process \n");
#if OPT_A2
struct trapframe thisTF = *tf; //create tf on stack
thisTF.tf_v0 =0; //child returns with 0
thisTF.tf_a3 =0; //error coding
thisTF.tf_epc +=4; //counter
as_activate();
mips_usermode(&thisTF);
panic("Should not return from mips usermode\n");
#else
(void)tf;
#endif
}
void child_process_entry(void *data1, unsigned long data2)
{
struct trapframe *tf = (struct trapframe *)data1 ;
curthread->t_addrspace = (struct addrspace *)data2 ;
as_activate(curthread->t_addrspace) ;
struct trapframe usertf ;
usertf = *tf;
//memcpy(&usertf,tf ,sizeof(struct trapframe ));
usertf.tf_v0 = 0 ;
usertf.tf_a3 = 0 ;
usertf.tf_epc += 4 ;
kfree(tf) ;
mips_usermode(&usertf) ;
}
void child_fork_entry(void *data1, unsigned long data2)
{
struct trapframe *ctf = (struct trapframe *)data1;
struct addrspace *caddr = (struct addrspace *)data2;
ctf->tf_a3= 0;
ctf->tf_v0= 0;
ctf->tf_epc = ctf->tf_epc+4;
curthread->t_addrspace = caddr;
as_activate(curthread->t_addrspace);
struct trapframe tf;
memcpy(&tf,ctf,sizeof(struct trapframe));
mips_usermode(&tf);
//KASSERT(SAME_STACK(cpustacks[curcpu->c_number]-1, (vaddr_t)tf_copy));
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(struct trapframe *tf)
{
#if OPT_A2
struct trapframe forkTf = *tf;
forkTf.tf_a3 = 0; //signal no error
forkTf.tf_v0 = 0;
forkTf.tf_epc += 4; //advance the PC, to avoid the syscall again
as_activate();
mips_usermode(&forkTf);
panic("can't come here");
#else
(void)tf;
#endif //OPT_A2
}
void
enter_forked_process(void *data1, unsigned long data2){
struct trapframe *childtf = ((void **)data1)[0];
struct addrspace *childas = ((void **)data1)[1];
// using local variable to put tf on stack
struct trapframe local = *childtf;
// switch to childas
curproc_setas(childas);
as_activate();
// set register
local.tf_epc += 4;
local.tf_v0 = 0;
local.tf_a3 = 0;
(void)data2;
mips_usermode(&local);
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(void* ptr, unsigned long args)
{
//panic("test");
//while(1) {}
struct trapframe childtf;
bzero(&childtf, sizeof(childtf));
childtf = *(struct trapframe *) ptr;
childtf.tf_v0 = 0;
childtf.tf_a3 = 0;
childtf.tf_epc += 4;
kfree(ptr);
// load and activate the address space
struct addrspace* as = (struct addrspace *) args;
proc_setas(as);
as_activate();
mips_usermode(&childtf);
}
void
child_forkentry(void *data1, unsigned long data2){
struct trapframe st_trapframe;
struct trapframe* childtf = (struct trapframe*) data1;
struct addrspace* childaddr = (struct addrspace*) data2;
childtf->tf_v0 = 0;
childtf->tf_a3 = 0;
childtf->tf_epc += 4;
memcpy(&st_trapframe, childtf, sizeof(struct trapframe));
kfree(childtf);
childtf = NULL;
curproc->p_addrspace = childaddr;
as_activate();
mips_usermode(&st_trapframe);
};
void
md_forkentry(struct fork_data *fd, unsigned long un)
{
(void) un;
struct trapframe local_tf;
local_tf = *(fd->tf);
curthread->t_vmspace = fd->addr;
as_activate(curthread->t_vmspace);
kfree(fd->tf);
kfree(fd);
local_tf.tf_epc += 4;
local_tf.tf_a3 = 0;
local_tf.tf_v0 = 0;
mips_usermode(&local_tf);
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(void *tf, unsigned long arg)
{
#if OPT_A2
(void) arg;
as_activate(); //activate the address space
struct trapframe stacktf;
stacktf = *(struct trapframe *) tf; //copy the trapframe
stacktf.tf_v0 = 0;
stacktf.tf_a3 = 0;
stacktf.tf_epc = stacktf.tf_epc + 4;
kfree(tf);
mips_usermode(&stacktf);
return;
#else
(void)tf;
(void)arg;
#endif
}
void
md_forkentry(struct trapframe *tf,unsigned long as_data)
{
struct trapframe tf_local;
struct trapframe *newtf;
struct addrspace *newas = (struct addrspace*) as_data;
tf_local = *tf;
newtf = &tf_local;
newtf->tf_v0 = 0;
newtf->tf_a3 = 0;
newtf->tf_epc += 4;
kfree(tf);
curthread->t_vmspace = newas;
as_activate(curthread->t_vmspace);
mips_usermode(&tf_local);
}
void
md_forkentry(struct trapframe *tf)
{
/*
* This function is used to copy the trap frame of the parent process into
* the the child's and return the child process to user mode
*/
//int spl;
// disable interrupts
//spl = splhigh();
//new trap frame for the child
struct trapframe newtf;
// copy the trap frame
memcpy (&newtf, tf, sizeof(struct trapframe));
//newtf = *tf;
newtf.tf_v0 = 0; // return value of the child process should be 0
newtf.tf_epc += 4; // advance the PC to avoid redo of the syscall
newtf.tf_a3 = 0; // indicate that there are no errors
curthread->t_vmspace = (struct addrspace*)tf->tf_a0;
//memcpy (curthread->t_vmspace, (struct addrspace*) tf->tf_a0, sizeof(struct addrspace*));
//kprintf ("BEOFRE");
//struct addrspace *temp = (struct addrspace*) tf->tf_a0;
//int test = as_copy(curthread->t_vmspace, &temp);
//kprintf ("as_copy: %d\n", test);
//kprintf ("TESTING HERE");
as_activate(curthread->t_vmspace);
kfree (tf);
V(curthread->t_sem_fork);
//kprintf ("md_forkentry childpid: %d\n", curthread->t_pid);
// re-enable interrupts
//splx(spl);
// Warp to user mode
mips_usermode(&newtf);
}
/*
* Enter user mode for a newly forked process.
*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
void
enter_forked_process(void *data1, unsigned long unused)
{
struct trapframe local_tf;
(void)unused;
/* Copy the trapframe passed in onto the current thread's stack */
local_tf = *(struct trapframe *)data1;
/* And free the kernel memory from the trapframe passed in */
kfree(data1);
/*
* Advance the program counter, to avoid restarting
* the syscall over and over again in the child.
*/
local_tf.tf_epc += 4;
local_tf.tf_a3 = 0; /* Success if the child gets here */
local_tf.tf_v0 = 0; /* return 0 to the child */
mips_usermode(&local_tf);
}
static
void md_forkentry(struct trapframe *tf, unsigned long vmspace)
{
// disable interrupt
struct addrspace *t_vmspace = (struct addrspace*)vmspace;
splhigh();
if (t_vmspace == NULL) {
thread_exit();
}
assert(curthread->t_vmspace == NULL);
curthread->t_vmspace = t_vmspace;
// copy the trapframe to our own stack and free it
struct trapframe mytf;
memmove(&mytf, tf, sizeof(mytf));
kfree(tf);
// set the return value to 0
mytf.tf_v0 = 0;
mytf.tf_a3 = 0;
// next instruction
mytf.tf_epc += 4;
/* Activate it. */
// as_hold(curthread->t_vmspace);
as_activate(curthread->t_vmspace);
// kprintf("sw to user mode.\n");
// switch to usermode
mips_usermode(&mytf);
// should not come here
assert(0);
}
void
md_forkentry(struct trapframe *tf)
{
/*
* This function is provided as a reminder. You need to write
* both it and the code that calls it.
*
* Thus, you can trash it and do things another way if you prefer.
*/
int s;
s = splhigh();
DEBUG(DB_SYSCALL,"forking thread");
//(void)tf;
//
tf->tf_v0 = 0; //set return value to 0 for child process
tf->tf_epc += 4; //advance pc to avoid restarting syscall
tf->tf_a3 = 0; //a3 set to 0 to indicate success
splx(s);
mips_usermode(tf);
}
void entrypoint(void* data1, unsigned long data2) {
struct trapframe *tf, tfnew;
struct addrspace * addr;
tf = (struct trapframe *) data1;
addr = (struct addrspace *) data2;
tf->tf_a3 = 0;
tf->tf_v0 = 0;
tf->tf_epc += 4;
//kprintf(" LMAO ");
curproc->p_addrspace = addr;
//kprintf(" rekt ");
//memcpy(tfnew, tf, sizeof(struct trapframe));
as_activate();
//kprintf(" nips ");
tfnew = *tf;
//kprintf(" nips ");
mips_usermode(&tfnew);
//kprintf(" SWAG ");
}
// The parent copies the appropriate data from itself to its child in this function
void start_child(void * data1, unsigned long unused) {
(void)unused;
struct fork_info * info = data1;
struct addrspace * new_as;
struct trapframe new_tf;
/* copy address space */
if (as_copy(info->parent->t_vmspace, &new_as)) {
info->child_pid = ENOMEM; // Means no memory for process
V(info->sem); // child is done, parent should resume.
thread_exit();
}
curthread->t_vmspace = new_as;
as_activate(new_as);
/* copy trap frame to new curkstack */
memcpy(&new_tf, info->tf, sizeof(struct trapframe));
/* change tf's registers to return values for syscall */
new_tf.tf_v0 = 0;
new_tf.tf_a3 = 0;
new_tf.tf_epc += 4;
/* create process and get the pid */
struct process *new_process = proctable_add_child_process(curthread->t_process);
if (new_process == NULL) {
info->child_pid = EAGAIN; // Means no more processes available in process table
V(info->sem); // child is done, parent should resume.
thread_exit();
}
info->child_pid = new_process->pid;
new_process->parent = info->parent->t_process;
// Attach new process to our thread
curthread->t_process = new_process;
// Initalize new file table
int result = fdtable_create();
if (result)
{
// Error occured
info->child_pid = result;
result = proctable_remove_process(new_process->pid);
// We're already exiting, so if there's an error with the line above, then it doesn't matter that much
V(info->sem); // child is done, parent should resume.
thread_exit();
}
struct process * parent_process = info->parent->t_process;
lock_acquire(parent_process->t_fdtable_lock);
// Copy file table
// This requires the filetable to be locked and the refcounts of each file to be increased.
int i;
for (i = 0; i < OPEN_MAX ; i++) {
new_process->t_fdtable->entries[i] = parent_process->t_fdtable->entries[i];
if (new_process->t_fdtable->entries[i] != NULL) new_process->t_fdtable->entries[i]->refcount++; // Increases the number of references to a file
}
lock_release(parent_process->t_fdtable_lock);
// child is done, parent should resume.
V(info->sem);
mips_usermode(&new_tf);
/* mips_usermode does not return */
panic("start_child returned\n");
}
