/*
* General trap (exception) handling function for mips.
* This is called by the assembly-language exception handler once
* the trapframe has been set up.
*/
void
mips_trap(struct trapframe *tf)
{//kprintf("mips_trap:epc=0x%x cause=%x badvaddr=0x%08x\n", tf->tf_epc, (tf->tf_cause >> 2) & 0x1F, tf->tf_vaddr);
// dispatch based on what type of trap occurred
// used for previous projects
if (current == NULL) {
trap_dispatch(tf);
}
else {
// keep a trapframe chain in stack
struct trapframe *otf = current->tf;
current->tf = tf;
bool in_kernel = trap_in_kernel(tf);
trap_dispatch(tf);
current->tf = otf;
if (!in_kernel) {
if (current->flags & PF_EXITING) {
do_exit(-E_KILLED);
}
if (current->need_resched) {
schedule();
}
}
}
}
/* *
* trap - handles or dispatches an exception/interrupt. if and when trap() returns,
* the code in kern/trap/trapentry.S restores the old CPU state saved in the
* trapframe and then uses the iret instruction to return from the exception.
* */
void
trap(struct trapframe *tf) {
// dispatch based on what type of trap occurred
// used for previous projects
if (current == NULL) {
trap_dispatch(tf);
}
else {
// keep a trapframe chain in stack
struct trapframe *otf = current->tf;
current->tf = tf;
bool in_kernel = trap_in_kernel(tf);
trap_dispatch(tf);
current->tf = otf;
if (!in_kernel) {
if (current->flags & PF_EXITING) {
do_exit(-E_KILLED);
}
if (current->need_resched) {
schedule();
}
}
}
}
void
trap(struct Trapframe *tf)
{
asm volatile("cld" : : : "cc");
assert(!(read_eflags() & FL_IF));
// cprintf("Incoming TRAP frame at %p\n", tf);
if ((tf->tf_cs & 3) == 3) {
// Trapped from user mode.
// Copy trap frame (which is currently on the stack)
// into 'curenv->env_tf', so that running the environment
// will restart at the trap point.
assert(curenv);
curenv->env_tf = *tf;
// The trapframe on the stack should be ignored from here on.
tf = &curenv->env_tf;
}
// Dispatch based on what type of trap occurred
trap_dispatch(tf);
// If we made it to this point, then no other environment was
// scheduled, so we should return to the current environment
// if doing so makes sense.
if (curenv && curenv->env_status == ENV_RUNNABLE)
env_run(curenv);
else
sched_yield();
}
void
trap(struct Trapframe *tf)
{
// The environment may have set DF and some versions
// of GCC rely on DF being clear
asm volatile("cld" ::: "cc");
// Halt the CPU if some other CPU has called panic()
extern char *panicstr;
if (panicstr)
asm volatile("hlt");
// Re-acqurie the big kernel lock if we were halted in
// sched_yield()
if (xchg(&thiscpu->cpu_status, CPU_STARTED) == CPU_HALTED)
lock_kernel();
// Check that interrupts are disabled. If this assertion
// fails, DO NOT be tempted to fix it by inserting a "cli" in
// the interrupt path.
assert(!(read_eflags() & FL_IF));
if ((tf->tf_cs & 3) == 3) {
// Trapped from user mode.
// Acquire the big kernel lock before doing any
// serious kernel work.
// LAB 4: Your code here.
assert(curenv);
lock_kernel();
// Garbage collect if current enviroment is a zombie
if (curenv->env_status == ENV_DYING) {
env_free(curenv);
curenv = NULL;
sched_yield();
}
// Copy trap frame (which is currently on the stack)
// into 'curenv->env_tf', so that running the environment
// will restart at the trap point.
curenv->env_tf = *tf;
// The trapframe on the stack should be ignored from here on.
tf = &curenv->env_tf;
}
// Record that tf is the last real trapframe so
// print_trapframe can print some additional information.
last_tf = tf;
// Dispatch based on what type of trap occurred
trap_dispatch(tf);
// If we made it to this point, then no other environment was
// scheduled, so we should return to the current environment
// if doing so makes sense.
if (curenv && curenv->env_status == ENV_RUNNING)
env_run(curenv);
else
sched_yield();
}
void
trap(struct Trapframe *tf)
{
// The environment may have set DF and some versions
// of GCC rely on DF being clear
asm volatile("cld" ::: "cc");
// Check that interrupts are disabled. If this assertion
// fails, DO NOT be tempted to fix it by inserting a "cli" in
// the interrupt path.
assert(!(read_eflags() & FL_IF));
if ((tf->tf_cs & 3) == 3) {
// Trapped from user mode.
// Copy trap frame (which is currently on the stack)
// into 'curenv->env_tf', so that running the environment
// will restart at the trap point.
assert(curenv);
curenv->env_tf = *tf;
// The trapframe on the stack should be ignored from here on.
tf = &curenv->env_tf;
}
// Dispatch based on what type of trap occurred
trap_dispatch(tf);
// If we made it to this point, then no other environment was
// scheduled, so we should return to the current environment
// if doing so makes sense.
if (curenv && curenv->env_status == ENV_RUNNABLE)
env_run(curenv);
else
sched_yield();
}
void trap(struct trapframe *tf)
{
// used for previous projects
if (pls_read(current) == NULL) {
trap_dispatch(tf);
} else {
// keep a trapframe chain in stack
struct trapframe *otf = pls_read(current)->tf;
pls_read(current)->tf = tf;
bool in_kernel = trap_in_kernel(tf);
trap_dispatch(tf);
pls_read(current)->tf = otf;
if (!in_kernel) {
may_killed();
if (pls_read(current)->need_resched) {
schedule();
}
}
}
}
void trap(struct frame *tf)
{
// The environment may have set DF and some versions
// of GCC rely on DF being clear
asm volatile("cld" ::: "cc");
assert(!(read_eflags() & FL_IF));
curtask->trapframe = tf;
if ((tf->tf_cs & 3) == 3) {
} else {
//print_frame(tf);
//panic("kernel double fault\n");
}
trap_dispatch(tf);
schedule();
}
void
trap(struct Trapframe *tf)
{
//struct Trapframe *tf = &tf_;
// The environment may have set DF and some versions
// of GCC rely on DF being clear
asm volatile("cld" ::: "cc");
// Check that interrupts are disabled. If this assertion
// fails, DO NOT be tempted to fix it by inserting a "cli" in
// the interrupt path.
assert(!(read_eflags() & FL_IF));
cprintf("Incoming TRAP frame at %p\n", tf);
if ((tf->tf_cs & 3) == 3) {
// Trapped from user mode.
assert(curenv);
// Copy trap frame (which is currently on the stack)
// into 'curenv->env_tf', so that running the environment
// will restart at the trap point.
curenv->env_tf = *tf;
// The trapframe on the stack should be ignored from here on.
tf = &curenv->env_tf;
}
// Record that tf is the last real trapframe so
// print_trapframe can print some additional information.
last_tf = tf;
// Dispatch based on what type of trap occurred
trap_dispatch(tf);
// Return to the current environment, which should be running.
assert(curenv && curenv->env_status == ENV_RUNNING);
env_run(curenv);
}
/* *
* trap - handles or dispatches an exception/interrupt. if and when trap() returns,
* the code in kern/trap/trapentry.S restores the old CPU state saved in the
* trapframe and then uses the iret instruction to return from the exception.
* */
void
trap(struct trapframe *tf) {
// dispatch based on what type of trap occurred
trap_dispatch(tf);
}
/* *
* trap - handles or dispatches an exception/interrupt. if and when trap() returns,
* the code in kern/trap/trapentry.S restores the old CPU state saved in the
* trapframe and then uses the iret instruction to return from the exception.
* */
void
trap(struct trapframe *tf) {
trap_dispatch(tf);
}