2008-02-08 13:19:31 +01:00
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/* MN10300 Process handling code
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <linux/percpu.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
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#include <linux/slab.h>
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2008-02-08 13:19:31 +01:00
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/fpu.h>
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#include <asm/reset-regs.h>
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#include <asm/gdb-stub.h>
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#include "internal.h"
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/*
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* power management idle function, if any..
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*/
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void (*pm_idle)(void);
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EXPORT_SYMBOL(pm_idle);
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/*
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* return saved PC of a blocked thread.
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*/
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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return ((unsigned long *) tsk->thread.sp)[3];
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}
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/*
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* power off function, if any
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*/
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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2010-10-27 18:28:55 +02:00
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#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
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2008-02-08 13:19:31 +01:00
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/*
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* we use this if we don't have any better idle routine
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*/
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static void default_idle(void)
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{
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local_irq_disable();
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if (!need_resched())
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safe_halt();
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else
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local_irq_enable();
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}
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2010-10-27 18:28:55 +02:00
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#else /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
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/*
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* On SMP it's slightly faster (but much more power-consuming!)
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* to poll the ->work.need_resched flag instead of waiting for the
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* cross-CPU IPI to arrive. Use this option with caution.
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*/
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static inline void poll_idle(void)
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{
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int oldval;
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local_irq_enable();
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/*
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* Deal with another CPU just having chosen a thread to
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* run here:
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*/
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oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
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if (!oldval) {
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set_thread_flag(TIF_POLLING_NRFLAG);
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while (!need_resched())
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cpu_relax();
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clear_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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set_need_resched();
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}
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}
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#endif /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
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2008-02-08 13:19:31 +01:00
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/*
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* the idle thread
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* - there's no useful work to be done, so just try to conserve power and have
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* a low exit latency (ie sit in a loop waiting for somebody to say that
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* they'd like to reschedule)
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*/
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void cpu_idle(void)
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{
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/* endless idle loop with no priority at all */
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for (;;) {
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while (!need_resched()) {
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void (*idle)(void);
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smp_rmb();
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idle = pm_idle;
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2010-10-27 18:28:55 +02:00
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if (!idle) {
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#if defined(CONFIG_SMP) && !defined(CONFIG_HOTPLUG_CPU)
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idle = poll_idle;
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#else /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
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2008-02-08 13:19:31 +01:00
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idle = default_idle;
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2010-10-27 18:28:55 +02:00
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#endif /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
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}
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2008-02-08 13:19:31 +01:00
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idle();
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}
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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}
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}
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void release_segments(struct mm_struct *mm)
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{
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}
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void machine_restart(char *cmd)
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{
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2011-03-18 17:54:31 +01:00
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#ifdef CONFIG_KERNEL_DEBUGGER
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2008-02-08 13:19:31 +01:00
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gdbstub_exit(0);
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#endif
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#ifdef mn10300_unit_hard_reset
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mn10300_unit_hard_reset();
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#else
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mn10300_proc_hard_reset();
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#endif
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}
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void machine_halt(void)
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{
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2011-03-18 17:54:31 +01:00
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#ifdef CONFIG_KERNEL_DEBUGGER
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2008-02-08 13:19:31 +01:00
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gdbstub_exit(0);
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#endif
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}
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void machine_power_off(void)
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{
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2011-03-18 17:54:31 +01:00
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#ifdef CONFIG_KERNEL_DEBUGGER
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2008-02-08 13:19:31 +01:00
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gdbstub_exit(0);
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#endif
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}
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void show_regs(struct pt_regs *regs)
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{
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}
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/*
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* create a kernel thread
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*/
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int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
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{
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struct pt_regs regs;
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memset(®s, 0, sizeof(regs));
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regs.a2 = (unsigned long) fn;
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regs.d2 = (unsigned long) arg;
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regs.pc = (unsigned long) kernel_thread_helper;
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local_save_flags(regs.epsw);
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regs.epsw |= EPSW_IE | EPSW_IM_7;
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/* Ok, create the new process.. */
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return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0,
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NULL, NULL);
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}
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2008-07-04 18:59:46 +02:00
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EXPORT_SYMBOL(kernel_thread);
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2008-02-08 13:19:31 +01:00
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/*
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* free current thread data structures etc..
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*/
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void exit_thread(void)
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{
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exit_fpu();
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}
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void flush_thread(void)
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{
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flush_fpu();
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}
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void release_thread(struct task_struct *dead_task)
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{
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}
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/*
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* we do not have to muck with descriptors here, that is
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* done in switch_mm() as needed.
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*/
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void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
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{
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}
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/*
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* this gets called before we allocate a new thread and copy the current task
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* into it so that we can store lazy state into memory
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*/
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void prepare_to_copy(struct task_struct *tsk)
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{
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unlazy_fpu(tsk);
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}
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/*
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* set up the kernel stack for a new thread and copy arch-specific thread
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* control information
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*/
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2009-04-03 01:56:59 +02:00
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int copy_thread(unsigned long clone_flags,
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2008-02-08 13:19:31 +01:00
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unsigned long c_usp, unsigned long ustk_size,
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struct task_struct *p, struct pt_regs *kregs)
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{
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2010-10-27 18:29:01 +02:00
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struct thread_info *ti = task_thread_info(p);
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2008-02-08 13:19:31 +01:00
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struct pt_regs *c_uregs, *c_kregs, *uregs;
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unsigned long c_ksp;
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uregs = current->thread.uregs;
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c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
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/* allocate the userspace exception frame and set it up */
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c_ksp -= sizeof(struct pt_regs);
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c_uregs = (struct pt_regs *) c_ksp;
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p->thread.uregs = c_uregs;
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*c_uregs = *uregs;
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c_uregs->sp = c_usp;
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c_uregs->epsw &= ~EPSW_FE; /* my FPU */
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c_ksp -= 12; /* allocate function call ABI slack */
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/* the new TLS pointer is passed in as arg #5 to sys_clone() */
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if (clone_flags & CLONE_SETTLS)
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2010-10-27 18:29:01 +02:00
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c_uregs->e2 = current_frame()->d3;
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2008-02-08 13:19:31 +01:00
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/* set up the return kernel frame if called from kernel_thread() */
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c_kregs = c_uregs;
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if (kregs != uregs) {
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c_ksp -= sizeof(struct pt_regs);
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c_kregs = (struct pt_regs *) c_ksp;
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*c_kregs = *kregs;
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c_kregs->sp = c_usp;
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c_kregs->next = c_uregs;
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#ifdef CONFIG_MN10300_CURRENT_IN_E2
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c_kregs->e2 = (unsigned long) p; /* current */
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#endif
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c_ksp -= 12; /* allocate function call ABI slack */
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}
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/* set up things up so the scheduler can start the new task */
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2010-10-27 18:29:01 +02:00
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ti->frame = c_kregs;
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2008-02-08 13:19:31 +01:00
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p->thread.a3 = (unsigned long) c_kregs;
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p->thread.sp = c_ksp;
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p->thread.pc = (unsigned long) ret_from_fork;
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p->thread.wchan = (unsigned long) ret_from_fork;
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p->thread.usp = c_usp;
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return 0;
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}
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/*
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* clone a process
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2010-10-27 18:29:01 +02:00
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* - tlsptr is retrieved by copy_thread() from current_frame()->d3
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2008-02-08 13:19:31 +01:00
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*/
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asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
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int __user *parent_tidptr, int __user *child_tidptr,
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int __user *tlsptr)
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{
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2010-10-27 18:29:01 +02:00
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return do_fork(clone_flags, newsp ?: current_frame()->sp,
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current_frame(), 0, parent_tidptr, child_tidptr);
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2008-02-08 13:19:31 +01:00
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}
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asmlinkage long sys_fork(void)
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{
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2010-10-27 18:29:01 +02:00
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return do_fork(SIGCHLD, current_frame()->sp,
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current_frame(), 0, NULL, NULL);
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2008-02-08 13:19:31 +01:00
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}
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asmlinkage long sys_vfork(void)
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{
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2010-10-27 18:29:01 +02:00
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, current_frame()->sp,
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current_frame(), 0, NULL, NULL);
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2008-02-08 13:19:31 +01:00
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}
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2010-08-11 12:26:22 +02:00
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asmlinkage long sys_execve(const char __user *name,
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2010-08-18 00:52:56 +02:00
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const char __user *const __user *argv,
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const char __user *const __user *envp)
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2008-02-08 13:19:31 +01:00
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{
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char *filename;
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int error;
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filename = getname(name);
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error = PTR_ERR(filename);
|
2009-10-12 23:41:55 +02:00
|
|
|
if (IS_ERR(filename))
|
|
|
|
return error;
|
2010-10-27 18:29:01 +02:00
|
|
|
error = do_execve(filename, argv, envp, current_frame());
|
2009-10-12 23:41:55 +02:00
|
|
|
putname(filename);
|
2008-02-08 13:19:31 +01:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
|
|
|
return p->thread.wchan;
|
|
|
|
}
|