-/*
+/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/sched.h"
#include "linux/slab.h"
#include "linux/ptrace.h"
+#include "linux/proc_fs.h"
+#include "linux/file.h"
+#include "linux/errno.h"
+#include "linux/init.h"
+#include "asm/uaccess.h"
+#include "asm/atomic.h"
#include "kern_util.h"
-#include "time_user.h"
-#include "signal_user.h"
#include "skas.h"
#include "os.h"
#include "user_util.h"
#include "tlb.h"
-#include "frame.h"
#include "kern.h"
#include "mode.h"
+#include "registers.h"
-int singlestepping_skas(void)
-{
- int ret = current->ptrace & PT_DTRACE;
-
- current->ptrace &= ~PT_DTRACE;
- return(ret);
-}
-
-void *switch_to_skas(void *prev, void *next)
+void switch_to_skas(void *prev, void *next)
{
struct task_struct *from, *to;
if(current->pid == 0)
switch_timers(0);
- to->thread.prev_sched = from;
- set_current(to);
-
- switch_threads(&from->thread.mode.skas.switch_buf,
+ switch_threads(&from->thread.mode.skas.switch_buf,
to->thread.mode.skas.switch_buf);
+ arch_switch_to_skas(current->thread.prev_sched, current);
+
if(current->pid == 0)
switch_timers(1);
-
- return(current->thread.prev_sched);
}
extern void schedule_tail(struct task_struct *prev);
fn = current->thread.request.u.thread.proc;
arg = current->thread.request.u.thread.arg;
- change_sig(SIGUSR1, 1);
- thread_wait(¤t->thread.mode.skas.switch_buf,
+ os_usr1_signal(1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
current->thread.mode.skas.fork_buf);
-#ifdef CONFIG_SMP
- schedule_tail(NULL);
-#endif
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
current->thread.prev_sched = NULL;
+ /* The return value is 1 if the kernel thread execs a process,
+ * 0 if it just exits
+ */
n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf);
- if(n == 1)
+ if(n == 1){
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
userspace(¤t->thread.regs.regs);
+ }
else do_exit(0);
}
{
}
-void exit_thread_skas(void)
-{
-}
-
void fork_handler(int sig)
{
- change_sig(SIGUSR1, 1);
- thread_wait(¤t->thread.mode.skas.switch_buf,
+ os_usr1_signal(1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
current->thread.mode.skas.fork_buf);
force_flush_all();
-#ifdef CONFIG_SMP
+ if(current->thread.prev_sched == NULL)
+ panic("blech");
+
schedule_tail(current->thread.prev_sched);
-#endif
+
+ /* XXX: if interrupt_end() calls schedule, this call to
+ * arch_switch_to_skas isn't needed. We could want to apply this to
+ * improve performance. -bb */
+ arch_switch_to_skas(current->thread.prev_sched, current);
+
current->thread.prev_sched = NULL;
- unblock_signals();
+
+/* Handle any immediate reschedules or signals */
+ interrupt_end();
userspace(¤t->thread.regs.regs);
}
int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
- unsigned long stack_top, struct task_struct * p,
+ unsigned long stack_top, struct task_struct * p,
struct pt_regs *regs)
{
void (*handler)(int);
if(current->thread.forking){
- memcpy(&p->thread.regs.regs.skas,
- ¤t->thread.regs.regs.skas,
+ memcpy(&p->thread.regs.regs.skas, ®s->regs.skas,
sizeof(p->thread.regs.regs.skas));
REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
handler = fork_handler;
+
+ arch_copy_thread(¤t->thread.arch, &p->thread.arch);
}
else {
- memcpy(p->thread.regs.regs.skas.regs, exec_regs,
- sizeof(p->thread.regs.regs.skas.regs));
- memcpy(p->thread.regs.regs.skas.fp, exec_fp_regs,
- sizeof(p->thread.regs.regs.skas.fp));
- memcpy(p->thread.regs.regs.skas.xfp, exec_fpx_regs,
- sizeof(p->thread.regs.regs.skas.xfp));
+ init_thread_registers(&p->thread.regs.regs);
p->thread.request.u.thread = current->thread.request.u.thread;
handler = new_thread_handler;
}
- new_thread((void *) p->thread.kernel_stack,
- &p->thread.mode.skas.switch_buf,
+ new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf,
&p->thread.mode.skas.fork_buf, handler);
return(0);
}
+int new_mm(unsigned long stack)
+{
+ int fd;
+
+ fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
+ if(fd < 0)
+ return(fd);
+
+ if(skas_needs_stub)
+ map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
+
+ return(fd);
+}
+
void init_idle_skas(void)
{
- cpu_tasks[current->thread_info->cpu].pid = os_getpid();
+ cpu_tasks[current_thread->cpu].pid = os_getpid();
default_idle();
}
return(0);
}
+extern int userspace_pid[];
+
int start_uml_skas(void)
{
- start_userspace();
- capture_signal_stack();
+ if(proc_mm)
+ userspace_pid[0] = start_userspace(0);
init_new_thread_signals(1);
- idle_timer();
init_task.thread.request.u.thread.proc = start_kernel_proc;
init_task.thread.request.u.thread.arg = NULL;
- return(start_idle_thread((void *) init_task.thread.kernel_stack,
+ return(start_idle_thread(task_stack_page(&init_task),
&init_task.thread.mode.skas.switch_buf,
&init_task.thread.mode.skas.fork_buf));
}
int external_pid_skas(struct task_struct *task)
{
- return(userspace_pid);
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[0]);
}
int thread_pid_skas(struct task_struct *task)
{
- return(userspace_pid);
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[0]);
}
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+void kill_off_processes_skas(void)
+{
+ if(proc_mm)
+#warning need to loop over userspace_pids in kill_off_processes_skas
+ os_kill_ptraced_process(userspace_pid[0], 1);
+ else {
+ struct task_struct *p;
+ int pid, me;
+
+ me = os_getpid();
+ for_each_process(p){
+ if(p->mm == NULL)
+ continue;
+
+ pid = p->mm->context.skas.id.u.pid;
+ os_kill_ptraced_process(pid, 1);
+ }
+ }
+}
+
+unsigned long current_stub_stack(void)
+{
+ if(current->mm == NULL)
+ return(0);
+
+ return(current->mm->context.skas.id.stack);
+}
git://git.onelab.eu / linux-2.6.git / blobdiff