2005-04-16 22:20:36 +00:00
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/*
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* linux/arch/m32r/kernel/process.c
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*
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* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
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* Hitoshi Yamamoto
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* Taken from sh version.
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* Copyright (C) 1995 Linus Torvalds
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* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
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*/
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#undef DEBUG_PROCESS
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#ifdef DEBUG_PROCESS
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#define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
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2008-10-16 05:01:25 +00:00
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__func__, ##args)
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2005-04-16 22:20:36 +00:00
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#else
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#define DPRINTK(fmt, args...)
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#endif
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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/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 08:04:11 +00:00
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#include <linux/slab.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/hardirq.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/elf.h>
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#include <asm/m32r.h>
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#include <linux/err.h>
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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 tsk->thread.lr;
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}
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/*
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* Powermanagement idle function, if any..
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*/
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2008-09-24 06:01:47 +00:00
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static void (*pm_idle)(void) = NULL;
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2006-01-08 09:03:46 +00:00
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void (*pm_power_off)(void) = NULL;
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EXPORT_SYMBOL(pm_power_off);
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2005-04-16 22:20:36 +00:00
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/*
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* We use this is we don't have any better
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* idle routine..
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*/
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2008-09-24 06:01:47 +00:00
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static void default_idle(void)
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2005-04-16 22:20:36 +00:00
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{
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/* M32R_FIXME: Please use "cpu_sleep" mode. */
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cpu_relax();
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}
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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 void poll_idle (void)
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{
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/* M32R_FIXME */
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cpu_relax();
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}
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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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while (1) {
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while (!need_resched()) {
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void (*idle)(void) = pm_idle;
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if (!idle)
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idle = default_idle;
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idle();
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}
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2005-11-09 05:39:01 +00:00
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preempt_enable_no_resched();
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2005-04-16 22:20:36 +00:00
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schedule();
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2005-11-09 05:39:01 +00:00
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preempt_disable();
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2005-04-16 22:20:36 +00:00
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}
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}
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void machine_restart(char *__unused)
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{
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2006-04-19 05:21:30 +00:00
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#if defined(CONFIG_PLAT_MAPPI3)
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outw(1, (unsigned long)PLD_REBOOT);
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#endif
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2005-04-16 22:20:36 +00:00
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printk("Please push reset button!\n");
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while (1)
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cpu_relax();
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}
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void machine_halt(void)
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{
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printk("Please push reset button!\n");
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while (1)
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cpu_relax();
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}
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void machine_power_off(void)
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{
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/* M32R_FIXME */
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}
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static int __init idle_setup (char *str)
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{
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if (!strncmp(str, "poll", 4)) {
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printk("using poll in idle threads.\n");
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pm_idle = poll_idle;
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} else if (!strncmp(str, "sleep", 4)) {
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printk("using sleep in idle threads.\n");
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pm_idle = default_idle;
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}
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return 1;
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}
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__setup("idle=", idle_setup);
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void show_regs(struct pt_regs * regs)
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{
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printk("\n");
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printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
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regs->bpc, regs->psw, regs->lr, regs->fp);
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printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
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regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
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printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
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regs->r0, regs->r1, regs->r2, regs->r3);
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printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
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regs->r4, regs->r5, regs->r6, regs->r7);
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printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
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regs->r8, regs->r9, regs->r10, regs->r11);
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printk("R12[%08lx]\n", \
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regs->r12);
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#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
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printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
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regs->acc0h, regs->acc0l);
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printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
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regs->acc1h, regs->acc1l);
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#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
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printk("ACCH[%08lx]:ACCL[%08lx]\n", \
|
2007-02-10 09:43:35 +00:00
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regs->acc0h, regs->acc0l);
|
2005-04-16 22:20:36 +00:00
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#else
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#error unknown isa configuration
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#endif
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}
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/*
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* Create a kernel thread
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*/
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/*
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* This is the mechanism for creating a new kernel thread.
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*
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* NOTE! Only a kernel-only process(ie the swapper or direct descendants
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* who haven't done an "execve()") should use this: it will work within
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* a system call from a "real" process, but the process memory space will
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* not be free'd until both the parent and the child have exited.
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*/
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static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
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{
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fn(arg);
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do_exit(-1);
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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.r1 = (unsigned long)fn;
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regs.r2 = (unsigned long)arg;
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regs.bpc = (unsigned long)kernel_thread_helper;
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regs.psw = M32R_PSW_BIE;
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/* Ok, create the new process. */
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return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL,
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NULL);
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}
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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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/* Nothing to do. */
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DPRINTK("pid = %d\n", current->pid);
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}
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void flush_thread(void)
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{
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|
DPRINTK("pid = %d\n", current->pid);
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|
|
memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap));
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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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/* do nothing */
|
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|
DPRINTK("pid = %d\n", dead_task->pid);
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|
|
}
|
|
|
|
|
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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, elf_fpregset_t *fpu)
|
|
|
|
{
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|
return 0; /* Task didn't use the fpu at all. */
|
|
|
|
}
|
|
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|
|
2009-04-02 23:56:59 +00:00
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|
|
int copy_thread(unsigned long clone_flags, unsigned long spu,
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
|
|
|
|
{
|
2006-01-12 09:05:52 +00:00
|
|
|
struct pt_regs *childregs = task_pt_regs(tsk);
|
2005-04-16 22:20:36 +00:00
|
|
|
extern void ret_from_fork(void);
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/* Copy registers */
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*childregs = *regs;
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childregs->spu = spu;
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childregs->r0 = 0; /* Child gets zero as return value */
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regs->r0 = tsk->pid;
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tsk->thread.sp = (unsigned long)childregs;
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|
tsk->thread.lr = (unsigned long)ret_from_fork;
|
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|
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|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
|
|
|
|
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
|
|
|
|
struct pt_regs regs)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL);
|
|
|
|
#else
|
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|
return -EINVAL;
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
}
|
|
|
|
|
|
|
|
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
|
|
unsigned long parent_tidptr,
|
|
|
|
unsigned long child_tidptr,
|
|
|
|
unsigned long r4, unsigned long r5, unsigned long r6,
|
|
|
|
struct pt_regs regs)
|
|
|
|
{
|
|
|
|
if (!newsp)
|
|
|
|
newsp = regs.spu;
|
|
|
|
|
|
|
|
return do_fork(clone_flags, newsp, ®s, 0,
|
|
|
|
(int __user *)parent_tidptr, (int __user *)child_tidptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This is trivial, and on the face of it looks like it
|
|
|
|
* could equally well be done in user mode.
|
|
|
|
*
|
|
|
|
* Not so, for quite unobvious reasons - register pressure.
|
|
|
|
* In user mode vfork() cannot have a stack frame, and if
|
|
|
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* done by calling the "clone()" system call directly, you
|
|
|
|
* do not have enough call-clobbered registers to hold all
|
|
|
|
* the information you need.
|
|
|
|
*/
|
|
|
|
asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
|
|
|
|
unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
|
|
|
|
struct pt_regs regs)
|
|
|
|
{
|
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|
|
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0,
|
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|
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NULL, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* sys_execve() executes a new program.
|
|
|
|
*/
|
2010-08-11 10:26:22 +00:00
|
|
|
asmlinkage int sys_execve(const char __user *ufilename,
|
|
|
|
char __user * __user *uargv,
|
2005-04-16 22:20:36 +00:00
|
|
|
char __user * __user *uenvp,
|
|
|
|
unsigned long r3, unsigned long r4, unsigned long r5,
|
|
|
|
unsigned long r6, struct pt_regs regs)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
char *filename;
|
|
|
|
|
|
|
|
filename = getname(ufilename);
|
|
|
|
error = PTR_ERR(filename);
|
|
|
|
if (IS_ERR(filename))
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
error = do_execve(filename, uargv, uenvp, ®s);
|
|
|
|
putname(filename);
|
|
|
|
out:
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* These bracket the sleeping functions..
|
|
|
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*/
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#define first_sched ((unsigned long) scheduling_functions_start_here)
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#define last_sched ((unsigned long) scheduling_functions_end_here)
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unsigned long get_wchan(struct task_struct *p)
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{
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/* M32R_FIXME */
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return (0);
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}
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