2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
6 #include "linux/sched.h"
7 #include "linux/slab.h"
8 #include "linux/ptrace.h"
9 #include "linux/proc_fs.h"
10 #include "linux/file.h"
11 #include "linux/errno.h"
12 #include "linux/init.h"
13 #include "asm/uaccess.h"
14 #include "asm/atomic.h"
15 #include "kern_util.h"
16 #include "time_user.h"
19 #include "user_util.h"
24 #include "registers.h"
26 void switch_to_skas(void *prev
, void *next
)
28 struct task_struct
*from
, *to
;
33 /* XXX need to check runqueues[cpu].idle */
37 switch_threads(&from
->thread
.mode
.skas
.switch_buf
,
38 to
->thread
.mode
.skas
.switch_buf
);
44 extern void schedule_tail(struct task_struct
*prev
);
46 void new_thread_handler(int sig
)
51 fn
= current
->thread
.request
.u
.thread
.proc
;
52 arg
= current
->thread
.request
.u
.thread
.arg
;
53 change_sig(SIGUSR1
, 1);
54 thread_wait(¤t
->thread
.mode
.skas
.switch_buf
,
55 current
->thread
.mode
.skas
.fork_buf
);
57 if(current
->thread
.prev_sched
!= NULL
)
58 schedule_tail(current
->thread
.prev_sched
);
59 current
->thread
.prev_sched
= NULL
;
61 /* The return value is 1 if the kernel thread execs a process,
64 n
= run_kernel_thread(fn
, arg
, ¤t
->thread
.exec_buf
);
66 /* Handle any immediate reschedules or signals */
68 userspace(¤t
->thread
.regs
.regs
);
73 void new_thread_proc(void *stack
, void (*handler
)(int sig
))
75 init_new_thread_stack(stack
, handler
);
76 os_usr1_process(os_getpid());
79 void release_thread_skas(struct task_struct
*task
)
83 void fork_handler(int sig
)
85 change_sig(SIGUSR1
, 1);
86 thread_wait(¤t
->thread
.mode
.skas
.switch_buf
,
87 current
->thread
.mode
.skas
.fork_buf
);
90 if(current
->thread
.prev_sched
== NULL
)
93 schedule_tail(current
->thread
.prev_sched
);
94 current
->thread
.prev_sched
= NULL
;
96 /* Handle any immediate reschedules or signals */
98 userspace(¤t
->thread
.regs
.regs
);
101 int copy_thread_skas(int nr
, unsigned long clone_flags
, unsigned long sp
,
102 unsigned long stack_top
, struct task_struct
* p
,
103 struct pt_regs
*regs
)
105 void (*handler
)(int);
107 if(current
->thread
.forking
){
108 memcpy(&p
->thread
.regs
.regs
.skas
, ®s
->regs
.skas
,
109 sizeof(p
->thread
.regs
.regs
.skas
));
110 REGS_SET_SYSCALL_RETURN(p
->thread
.regs
.regs
.skas
.regs
, 0);
111 if(sp
!= 0) REGS_SP(p
->thread
.regs
.regs
.skas
.regs
) = sp
;
113 handler
= fork_handler
;
116 init_thread_registers(&p
->thread
.regs
.regs
);
117 p
->thread
.request
.u
.thread
= current
->thread
.request
.u
.thread
;
118 handler
= new_thread_handler
;
121 new_thread(task_stack_page(p
), &p
->thread
.mode
.skas
.switch_buf
,
122 &p
->thread
.mode
.skas
.fork_buf
, handler
);
126 extern void map_stub_pages(int fd
, unsigned long code
,
127 unsigned long data
, unsigned long stack
);
128 int new_mm(int from
, unsigned long stack
)
130 struct proc_mm_op copy
;
133 fd
= os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
138 copy
= ((struct proc_mm_op
) { .op
= MM_COPY_SEGMENTS
,
140 { .copy_segments
= from
} } );
141 n
= os_write_file(fd
, ©
, sizeof(copy
));
142 if(n
!= sizeof(copy
))
143 printk("new_mm : /proc/mm copy_segments failed, "
148 map_stub_pages(fd
, CONFIG_STUB_CODE
, CONFIG_STUB_DATA
, stack
);
153 void init_idle_skas(void)
155 cpu_tasks
[current_thread
->cpu
].pid
= os_getpid();
159 extern void start_kernel(void);
161 static int start_kernel_proc(void *unused
)
168 cpu_tasks
[0].pid
= pid
;
169 cpu_tasks
[0].task
= current
;
171 cpu_online_map
= cpumask_of_cpu(0);
177 extern int userspace_pid
[];
179 int start_uml_skas(void)
182 userspace_pid
[0] = start_userspace(0);
184 init_new_thread_signals(1);
186 init_task
.thread
.request
.u
.thread
.proc
= start_kernel_proc
;
187 init_task
.thread
.request
.u
.thread
.arg
= NULL
;
188 return(start_idle_thread(task_stack_page(&init_task
),
189 &init_task
.thread
.mode
.skas
.switch_buf
,
190 &init_task
.thread
.mode
.skas
.fork_buf
));
193 int external_pid_skas(struct task_struct
*task
)
195 #warning Need to look up userspace_pid by cpu
196 return(userspace_pid
[0]);
199 int thread_pid_skas(struct task_struct
*task
)
201 #warning Need to look up userspace_pid by cpu
202 return(userspace_pid
[0]);
205 void kill_off_processes_skas(void)
208 #warning need to loop over userspace_pids in kill_off_processes_skas
209 os_kill_ptraced_process(userspace_pid
[0], 1);
211 struct task_struct
*p
;
219 pid
= p
->mm
->context
.skas
.id
.u
.pid
;
220 os_kill_ptraced_process(pid
, 1);
225 unsigned long current_stub_stack(void)
227 if(current
->mm
== NULL
)
230 return(current
->mm
->context
.skas
.id
.stack
);