2005-04-17 02:20:36 +04:00
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/*
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* linux/arch/m68knommu/kernel/process.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*
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* uClinux changes
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* Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com>
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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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/smp_lock.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/reboot.h>
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2007-08-24 03:26:06 +04:00
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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 11:04:11 +03:00
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#include <linux/slab.h>
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2005-04-17 02:20:36 +04:00
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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asmlinkage void ret_from_fork(void);
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2006-02-08 02:19:17 +03:00
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/*
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* The following aren't currently used.
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*/
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void (*pm_idle)(void);
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EXPORT_SYMBOL(pm_idle);
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void (*pm_power_off)(void);
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EXPORT_SYMBOL(pm_power_off);
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2005-04-17 02:20:36 +04:00
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/*
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* The idle loop on an m68knommu..
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*/
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2006-03-24 14:15:57 +03:00
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static void default_idle(void)
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2005-04-17 02:20:36 +04:00
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{
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2005-06-03 05:35:20 +04:00
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local_irq_disable();
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while (!need_resched()) {
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/* This stop will re-enable interrupts */
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__asm__("stop #0x2000" : : : "cc");
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local_irq_disable();
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2005-04-17 02:20:36 +04:00
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}
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2005-06-03 05:35:20 +04:00
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local_irq_enable();
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2005-04-17 02:20:36 +04:00
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}
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void (*idle)(void) = default_idle;
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/*
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* The idle thread. There's no useful work to be
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* done, so just try to conserve power and have a
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* low exit latency (ie sit in a loop waiting for
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* somebody to say that 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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2005-06-03 05:35:20 +04:00
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while (1) {
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idle();
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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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2005-04-17 02:20:36 +04:00
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}
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void machine_restart(char * __unused)
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{
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if (mach_reset)
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mach_reset();
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for (;;);
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}
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void machine_halt(void)
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{
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if (mach_halt)
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mach_halt();
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for (;;);
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}
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void machine_power_off(void)
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{
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if (mach_power_off)
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mach_power_off();
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for (;;);
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}
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void show_regs(struct pt_regs * regs)
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{
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printk(KERN_NOTICE "\n");
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printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
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regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
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printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
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regs->orig_d0, regs->d0, regs->a2, regs->a1);
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printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
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regs->a0, regs->d5, regs->d4);
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printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
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regs->d3, regs->d2, regs->d1);
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if (!(regs->sr & PS_S))
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printk(KERN_NOTICE "USP: %08lx\n", rdusp());
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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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int retval;
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long clone_arg = flags | CLONE_VM;
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mm_segment_t fs;
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fs = get_fs();
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set_fs(KERNEL_DS);
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__asm__ __volatile__ (
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"movel %%sp, %%d2\n\t"
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"movel %5, %%d1\n\t"
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"movel %1, %%d0\n\t"
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"trap #0\n\t"
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"cmpl %%sp, %%d2\n\t"
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"jeq 1f\n\t"
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"movel %3, %%sp@-\n\t"
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"jsr %4@\n\t"
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"movel %2, %%d0\n\t"
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"trap #0\n"
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"1:\n\t"
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"movel %%d0, %0\n"
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: "=d" (retval)
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: "i" (__NR_clone),
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"i" (__NR_exit),
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"a" (arg),
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"a" (fn),
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"a" (clone_arg)
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: "cc", "%d0", "%d1", "%d2");
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set_fs(fs);
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return retval;
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}
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void flush_thread(void)
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{
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#ifdef CONFIG_FPU
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unsigned long zero = 0;
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#endif
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set_fs(USER_DS);
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current->thread.fs = __USER_DS;
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#ifdef CONFIG_FPU
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if (!FPU_IS_EMU)
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asm volatile (".chip 68k/68881\n\t"
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"frestore %0@\n\t"
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".chip 68k" : : "a" (&zero));
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#endif
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}
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/*
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* "m68k_fork()".. By the time we get here, the
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* non-volatile registers have also been saved on the
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* stack. We do some ugly pointer stuff here.. (see
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* also copy_thread)
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*/
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asmlinkage int m68k_fork(struct pt_regs *regs)
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{
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/* fork almost works, enough to trick you into looking elsewhere :-( */
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return(-EINVAL);
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}
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asmlinkage int m68k_vfork(struct pt_regs *regs)
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{
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return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
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}
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asmlinkage int m68k_clone(struct pt_regs *regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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/* syscall2 puts clone_flags in d1 and usp in d2 */
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clone_flags = regs->d1;
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newsp = regs->d2;
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if (!newsp)
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newsp = rdusp();
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return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
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}
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2009-04-03 03:56:59 +04:00
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int copy_thread(unsigned long clone_flags,
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2005-04-17 02:20:36 +04:00
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unsigned long usp, unsigned long topstk,
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struct task_struct * p, struct pt_regs * regs)
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{
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struct pt_regs * childregs;
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struct switch_stack * childstack, *stack;
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2006-01-12 12:05:54 +03:00
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unsigned long *retp;
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2005-04-17 02:20:36 +04:00
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2006-01-12 12:05:54 +03:00
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childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
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2005-04-17 02:20:36 +04:00
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*childregs = *regs;
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childregs->d0 = 0;
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retp = ((unsigned long *) regs);
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stack = ((struct switch_stack *) retp) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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*childstack = *stack;
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childstack->retpc = (unsigned long)ret_from_fork;
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p->thread.usp = usp;
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p->thread.ksp = (unsigned long)childstack;
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2009-12-06 21:08:14 +03:00
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if (clone_flags & CLONE_SETTLS)
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task_thread_info(p)->tp_value = regs->d5;
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2005-04-17 02:20:36 +04:00
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/*
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* Must save the current SFC/DFC value, NOT the value when
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* the parent was last descheduled - RGH 10-08-96
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*/
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p->thread.fs = get_fs().seg;
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#ifdef CONFIG_FPU
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if (!FPU_IS_EMU) {
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/* Copy the current fpu state */
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asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
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if (p->thread.fpstate[0])
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asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
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"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
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: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
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: "memory");
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/* Restore the state in case the fpu was busy */
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asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
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}
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#endif
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return 0;
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}
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/* Fill in the fpu structure for a core dump. */
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int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
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{
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#ifdef CONFIG_FPU
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char fpustate[216];
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if (FPU_IS_EMU) {
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int i;
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memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
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memcpy(fpu->fpregs, current->thread.fp, 96);
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/* Convert internal fpu reg representation
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* into long double format
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*/
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for (i = 0; i < 24; i += 3)
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fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
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((fpu->fpregs[i] & 0x0000ffff) << 16);
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return 1;
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}
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/* First dump the fpu context to avoid protocol violation. */
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asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
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if (!fpustate[0])
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return 0;
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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:: "m" (fpu->fpcntl[0])
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: "memory");
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asm volatile ("fmovemx %/fp0-%/fp7,%0"
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:: "m" (fpu->fpregs[0])
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: "memory");
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#endif
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return 1;
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}
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/*
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* Generic dumping code. Used for panic and debug.
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*/
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void dump(struct pt_regs *fp)
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{
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unsigned long *sp;
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unsigned char *tp;
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int i;
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|
2009-07-07 00:05:40 +04:00
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printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
|
2005-04-17 02:20:36 +04:00
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printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
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if (current->mm) {
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printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
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(int) current->mm->start_code,
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(int) current->mm->end_code,
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(int) current->mm->start_data,
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(int) current->mm->end_data,
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(int) current->mm->end_data,
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(int) current->mm->brk);
|
2009-07-07 00:05:40 +04:00
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|
|
printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
|
2005-04-17 02:20:36 +04:00
|
|
|
(int) current->mm->start_stack,
|
|
|
|
(int)(((unsigned long) current) + THREAD_SIZE));
|
|
|
|
}
|
|
|
|
|
|
|
|
printk(KERN_EMERG "PC: %08lx\n", fp->pc);
|
|
|
|
printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
|
|
|
|
printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
|
|
|
|
fp->d0, fp->d1, fp->d2, fp->d3);
|
|
|
|
printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
|
|
|
|
fp->d4, fp->d5, fp->a0, fp->a1);
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %08x\n",
|
2006-12-04 10:26:55 +03:00
|
|
|
(unsigned int) rdusp(), (unsigned int) fp);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "\nCODE:");
|
2005-04-17 02:20:36 +04:00
|
|
|
tp = ((unsigned char *) fp->pc) - 0x20;
|
|
|
|
for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
|
|
|
|
if ((i % 0x10) == 0)
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "%08x: ", (int) (tp + i));
|
2006-12-04 10:26:55 +03:00
|
|
|
printk("%08x ", (int) *sp++);
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "\n");
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2006-12-04 10:26:55 +03:00
|
|
|
printk(KERN_EMERG "KERNEL STACK:");
|
2005-04-17 02:20:36 +04:00
|
|
|
tp = ((unsigned char *) fp) - 0x40;
|
|
|
|
for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
|
|
|
|
if ((i % 0x10) == 0)
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "%08x: ", (int) (tp + i));
|
2006-12-04 10:26:55 +03:00
|
|
|
printk("%08x ", (int) *sp++);
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "\n");
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2006-12-04 10:26:55 +03:00
|
|
|
printk(KERN_EMERG "USER STACK:");
|
2005-04-17 02:20:36 +04:00
|
|
|
tp = (unsigned char *) (rdusp() - 0x10);
|
|
|
|
for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
|
|
|
|
if ((i % 0x10) == 0)
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "%08x: ", (int) (tp + i));
|
2006-12-04 10:26:55 +03:00
|
|
|
printk("%08x ", (int) *sp++);
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
2009-07-07 00:05:40 +04:00
|
|
|
printk(KERN_EMERG "\n");
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* sys_execve() executes a new program.
|
|
|
|
*/
|
|
|
|
asmlinkage int sys_execve(char *name, char **argv, char **envp)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
char * filename;
|
|
|
|
struct pt_regs *regs = (struct pt_regs *) &name;
|
|
|
|
|
|
|
|
filename = getname(name);
|
|
|
|
error = PTR_ERR(filename);
|
|
|
|
if (IS_ERR(filename))
|
2009-10-13 01:37:28 +04:00
|
|
|
return error;
|
2005-04-17 02:20:36 +04:00
|
|
|
error = do_execve(filename, argv, envp, regs);
|
|
|
|
putname(filename);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
|
|
{
|
|
|
|
unsigned long fp, pc;
|
|
|
|
unsigned long stack_page;
|
|
|
|
int count = 0;
|
|
|
|
if (!p || p == current || p->state == TASK_RUNNING)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
stack_page = (unsigned long)p;
|
|
|
|
fp = ((struct switch_stack *)p->thread.ksp)->a6;
|
|
|
|
do {
|
|
|
|
if (fp < stack_page+sizeof(struct thread_info) ||
|
2007-07-16 10:38:31 +04:00
|
|
|
fp >= THREAD_SIZE-8+stack_page)
|
2005-04-17 02:20:36 +04:00
|
|
|
return 0;
|
|
|
|
pc = ((unsigned long *)fp)[1];
|
|
|
|
if (!in_sched_functions(pc))
|
|
|
|
return pc;
|
|
|
|
fp = *(unsigned long *) fp;
|
|
|
|
} while (count++ < 16);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return saved PC of a blocked thread.
|
|
|
|
*/
|
|
|
|
unsigned long thread_saved_pc(struct task_struct *tsk)
|
|
|
|
{
|
|
|
|
struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
|
|
|
|
|
|
|
|
/* Check whether the thread is blocked in resume() */
|
|
|
|
if (in_sched_functions(sw->retpc))
|
|
|
|
return ((unsigned long *)sw->a6)[1];
|
|
|
|
else
|
|
|
|
return sw->retpc;
|
|
|
|
}
|
|
|
|
|