2008-04-27 09:26:36 +00:00
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/* arch/sparc64/kernel/process.c
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2005-04-16 22:20:36 +00:00
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*
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2008-05-20 06:46:00 +00:00
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* Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net)
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2005-04-16 22:20:36 +00:00
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* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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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 <stdarg.h>
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#include <linux/errno.h>
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2011-07-22 17:18:16 +00:00
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#include <linux/export.h>
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2005-04-16 22:20:36 +00:00
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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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2007-07-29 22:36:13 +00:00
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#include <linux/fs.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/delay.h>
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#include <linux/compat.h>
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2007-02-22 14:24:45 +00:00
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#include <linux/tick.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/init.h>
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2007-07-16 10:49:40 +00:00
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#include <linux/cpu.h>
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2008-02-20 05:25:50 +00:00
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#include <linux/elfcore.h>
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2008-05-20 06:46:00 +00:00
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#include <linux/sysrq.h>
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2009-02-03 05:57:48 +00:00
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#include <linux/nmi.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/pstate.h>
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#include <asm/elf.h>
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#include <asm/fpumacro.h>
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#include <asm/head.h>
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#include <asm/cpudata.h>
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2006-02-01 02:29:18 +00:00
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#include <asm/mmu_context.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/unistd.h>
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2006-02-22 00:55:23 +00:00
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#include <asm/hypervisor.h>
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2008-02-20 05:25:50 +00:00
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#include <asm/syscalls.h>
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2008-05-20 06:46:00 +00:00
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#include <asm/irq_regs.h>
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#include <asm/smp.h>
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2005-04-16 22:20:36 +00:00
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2008-08-13 01:33:56 +00:00
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#include "kstack.h"
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2007-07-16 10:49:40 +00:00
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static void sparc64_yield(int cpu)
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2005-04-16 22:20:36 +00:00
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{
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2009-02-03 05:57:48 +00:00
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if (tlb_type != hypervisor) {
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touch_nmi_watchdog();
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2006-02-22 00:55:23 +00:00
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return;
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2009-02-03 05:57:48 +00:00
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}
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2006-02-22 00:55:23 +00:00
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clear_thread_flag(TIF_POLLING_NRFLAG);
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smp_mb__after_clear_bit();
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2007-07-16 10:49:40 +00:00
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while (!need_resched() && !cpu_is_offline(cpu)) {
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2006-02-22 00:55:23 +00:00
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unsigned long pstate;
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/* Disable interrupts. */
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__asm__ __volatile__(
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"rdpr %%pstate, %0\n\t"
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"andn %0, %1, %0\n\t"
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"wrpr %0, %%g0, %%pstate"
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: "=&r" (pstate)
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: "i" (PSTATE_IE));
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2007-07-16 10:49:40 +00:00
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if (!need_resched() && !cpu_is_offline(cpu))
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2006-02-22 00:55:23 +00:00
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sun4v_cpu_yield();
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/* Re-enable interrupts. */
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__asm__ __volatile__(
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"rdpr %%pstate, %0\n\t"
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"or %0, %1, %0\n\t"
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"wrpr %0, %%g0, %%pstate"
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: "=&r" (pstate)
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: "i" (PSTATE_IE));
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2005-04-16 22:20:36 +00:00
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}
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2006-02-22 00:55:23 +00:00
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set_thread_flag(TIF_POLLING_NRFLAG);
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}
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2005-04-16 22:20:36 +00:00
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2006-02-22 00:55:23 +00:00
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/* The idle loop on sparc64. */
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2005-04-16 22:20:36 +00:00
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void cpu_idle(void)
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{
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2007-07-16 10:49:40 +00:00
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int cpu = smp_processor_id();
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2005-04-16 22:20:36 +00:00
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set_thread_flag(TIF_POLLING_NRFLAG);
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[PATCH] sched: resched and cpu_idle rework
Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce
confusion, and make their semantics rigid. Improves efficiency of
resched_task and some cpu_idle routines.
* In resched_task:
- TIF_NEED_RESCHED is only cleared with the task's runqueue lock held,
and as we hold it during resched_task, then there is no need for an
atomic test and set there. The only other time this should be set is
when the task's quantum expires, in the timer interrupt - this is
protected against because the rq lock is irq-safe.
- If TIF_NEED_RESCHED is set, then we don't need to do anything. It
won't get unset until the task get's schedule()d off.
- If we are running on the same CPU as the task we resched, then set
TIF_NEED_RESCHED and no further action is required.
- If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set
after TIF_NEED_RESCHED has been set, then we need to send an IPI.
Using these rules, we are able to remove the test and set operation in
resched_task, and make clear the previously vague semantics of
POLLING_NRFLAG.
* In idle routines:
- Enter cpu_idle with preempt disabled. When the need_resched() condition
becomes true, explicitly call schedule(). This makes things a bit clearer
(IMO), but haven't updated all architectures yet.
- Many do a test and clear of TIF_NEED_RESCHED for some reason. According
to the resched_task rules, this isn't needed (and actually breaks the
assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock
held). So remove that. Generally one less locked memory op when switching
to the idle thread.
- Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner
most polling idle loops. The above resched_task semantics allow it to be
set until before the last time need_resched() is checked before going into
a halt requiring interrupt wakeup.
Many idle routines simply never enter such a halt, and so POLLING_NRFLAG
can be always left set, completely eliminating resched IPIs when rescheduling
the idle task.
POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 05:39:04 +00:00
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2005-04-16 22:20:36 +00:00
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while(1) {
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2008-07-18 15:27:28 +00:00
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tick_nohz_stop_sched_tick(1);
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2007-07-16 10:49:40 +00:00
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while (!need_resched() && !cpu_is_offline(cpu))
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sparc64_yield(cpu);
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2007-02-22 14:24:45 +00:00
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tick_nohz_restart_sched_tick();
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preempt_enable_no_resched();
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2007-07-16 10:49:40 +00:00
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#ifdef CONFIG_HOTPLUG_CPU
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if (cpu_is_offline(cpu))
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cpu_play_dead();
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#endif
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2007-02-22 14:24:45 +00:00
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schedule();
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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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2006-01-18 22:58:05 +00:00
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#ifdef CONFIG_COMPAT
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2005-04-16 22:20:36 +00:00
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static void show_regwindow32(struct pt_regs *regs)
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{
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struct reg_window32 __user *rw;
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struct reg_window32 r_w;
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mm_segment_t old_fs;
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__asm__ __volatile__ ("flushw");
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rw = compat_ptr((unsigned)regs->u_regs[14]);
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old_fs = get_fs();
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set_fs (USER_DS);
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if (copy_from_user (&r_w, rw, sizeof(r_w))) {
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set_fs (old_fs);
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return;
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}
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set_fs (old_fs);
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printk("l0: %08x l1: %08x l2: %08x l3: %08x "
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"l4: %08x l5: %08x l6: %08x l7: %08x\n",
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r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3],
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r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]);
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printk("i0: %08x i1: %08x i2: %08x i3: %08x "
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"i4: %08x i5: %08x i6: %08x i7: %08x\n",
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r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3],
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r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]);
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}
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2006-01-18 22:58:05 +00:00
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#else
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#define show_regwindow32(regs) do { } while (0)
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#endif
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2005-04-16 22:20:36 +00:00
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static void show_regwindow(struct pt_regs *regs)
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{
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struct reg_window __user *rw;
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struct reg_window *rwk;
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struct reg_window r_w;
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mm_segment_t old_fs;
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if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) {
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__asm__ __volatile__ ("flushw");
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rw = (struct reg_window __user *)
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(regs->u_regs[14] + STACK_BIAS);
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rwk = (struct reg_window *)
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(regs->u_regs[14] + STACK_BIAS);
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if (!(regs->tstate & TSTATE_PRIV)) {
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old_fs = get_fs();
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set_fs (USER_DS);
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if (copy_from_user (&r_w, rw, sizeof(r_w))) {
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set_fs (old_fs);
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return;
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}
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rwk = &r_w;
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set_fs (old_fs);
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}
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} else {
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show_regwindow32(regs);
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return;
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}
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printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n",
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rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]);
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printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n",
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rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]);
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printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n",
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rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]);
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printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n",
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rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]);
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if (regs->tstate & TSTATE_PRIV)
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2008-07-18 05:11:32 +00:00
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printk("I7: <%pS>\n", (void *) rwk->ins[7]);
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2005-04-16 22:20:36 +00:00
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}
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2008-08-01 03:33:43 +00:00
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void show_regs(struct pt_regs *regs)
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2005-04-16 22:20:36 +00:00
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{
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printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate,
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regs->tpc, regs->tnpc, regs->y, print_tainted());
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2008-07-18 05:11:32 +00:00
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printk("TPC: <%pS>\n", (void *) regs->tpc);
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2005-04-16 22:20:36 +00:00
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printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n",
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regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
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regs->u_regs[3]);
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printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n",
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regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
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regs->u_regs[7]);
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printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n",
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regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
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regs->u_regs[11]);
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printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n",
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regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
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regs->u_regs[15]);
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2008-07-18 05:11:32 +00:00
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printk("RPC: <%pS>\n", (void *) regs->u_regs[15]);
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2005-04-16 22:20:36 +00:00
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show_regwindow(regs);
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2010-04-21 09:31:50 +00:00
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show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
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2005-04-16 22:20:36 +00:00
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}
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2008-05-20 06:46:00 +00:00
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struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
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static DEFINE_SPINLOCK(global_reg_snapshot_lock);
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static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
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int this_cpu)
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{
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flushw_all();
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global_reg_snapshot[this_cpu].tstate = regs->tstate;
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global_reg_snapshot[this_cpu].tpc = regs->tpc;
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global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
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global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
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if (regs->tstate & TSTATE_PRIV) {
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struct reg_window *rw;
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rw = (struct reg_window *)
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(regs->u_regs[UREG_FP] + STACK_BIAS);
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2008-08-13 01:33:56 +00:00
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if (kstack_valid(tp, (unsigned long) rw)) {
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2008-07-31 04:57:59 +00:00
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global_reg_snapshot[this_cpu].i7 = rw->ins[7];
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rw = (struct reg_window *)
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(rw->ins[6] + STACK_BIAS);
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2008-08-13 01:33:56 +00:00
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if (kstack_valid(tp, (unsigned long) rw))
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2008-07-31 04:57:59 +00:00
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global_reg_snapshot[this_cpu].rpc = rw->ins[7];
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}
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} else {
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2008-05-20 06:46:00 +00:00
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global_reg_snapshot[this_cpu].i7 = 0;
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2008-07-31 04:57:59 +00:00
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global_reg_snapshot[this_cpu].rpc = 0;
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}
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2008-05-20 06:46:00 +00:00
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global_reg_snapshot[this_cpu].thread = tp;
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}
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/* In order to avoid hangs we do not try to synchronize with the
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* global register dump client cpus. The last store they make is to
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* the thread pointer, so do a short poll waiting for that to become
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* non-NULL.
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*/
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static void __global_reg_poll(struct global_reg_snapshot *gp)
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{
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int limit = 0;
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while (!gp->thread && ++limit < 100) {
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barrier();
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udelay(1);
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}
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}
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2009-08-03 07:31:54 +00:00
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void arch_trigger_all_cpu_backtrace(void)
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2008-05-20 06:46:00 +00:00
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{
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struct thread_info *tp = current_thread_info();
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struct pt_regs *regs = get_irq_regs();
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unsigned long flags;
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int this_cpu, cpu;
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if (!regs)
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regs = tp->kregs;
|
|
|
|
|
|
|
|
spin_lock_irqsave(&global_reg_snapshot_lock, flags);
|
|
|
|
|
|
|
|
memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
|
|
|
|
|
|
|
|
this_cpu = raw_smp_processor_id();
|
|
|
|
|
|
|
|
__global_reg_self(tp, regs, this_cpu);
|
|
|
|
|
|
|
|
smp_fetch_global_regs();
|
|
|
|
|
|
|
|
for_each_online_cpu(cpu) {
|
|
|
|
struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
|
|
|
|
|
|
|
|
__global_reg_poll(gp);
|
|
|
|
|
|
|
|
tp = gp->thread;
|
|
|
|
printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n",
|
|
|
|
(cpu == this_cpu ? '*' : ' '), cpu,
|
|
|
|
gp->tstate, gp->tpc, gp->tnpc,
|
|
|
|
((tp && tp->task) ? tp->task->comm : "NULL"),
|
|
|
|
((tp && tp->task) ? tp->task->pid : -1));
|
2008-07-18 05:11:32 +00:00
|
|
|
|
2008-05-20 06:46:00 +00:00
|
|
|
if (gp->tstate & TSTATE_PRIV) {
|
2008-07-31 04:57:59 +00:00
|
|
|
printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n",
|
2008-07-18 05:11:32 +00:00
|
|
|
(void *) gp->tpc,
|
|
|
|
(void *) gp->o7,
|
2008-07-31 04:57:59 +00:00
|
|
|
(void *) gp->i7,
|
|
|
|
(void *) gp->rpc);
|
2008-07-18 05:11:32 +00:00
|
|
|
} else {
|
2008-07-31 04:57:59 +00:00
|
|
|
printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n",
|
|
|
|
gp->tpc, gp->o7, gp->i7, gp->rpc);
|
2008-05-20 06:46:00 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
|
|
|
|
}
|
|
|
|
|
2008-07-31 05:35:00 +00:00
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
|
|
|
2010-08-18 04:15:46 +00:00
|
|
|
static void sysrq_handle_globreg(int key)
|
2008-07-31 05:35:00 +00:00
|
|
|
{
|
2009-08-03 07:31:54 +00:00
|
|
|
arch_trigger_all_cpu_backtrace();
|
2008-07-31 05:35:00 +00:00
|
|
|
}
|
|
|
|
|
2008-05-20 06:46:00 +00:00
|
|
|
static struct sysrq_key_op sparc_globalreg_op = {
|
|
|
|
.handler = sysrq_handle_globreg,
|
|
|
|
.help_msg = "Globalregs",
|
|
|
|
.action_msg = "Show Global CPU Regs",
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init sparc_globreg_init(void)
|
|
|
|
{
|
|
|
|
return register_sysrq_key('y', &sparc_globalreg_op);
|
|
|
|
}
|
|
|
|
|
|
|
|
core_initcall(sparc_globreg_init);
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long thread_saved_pc(struct task_struct *tsk)
|
|
|
|
{
|
2006-01-12 09:05:42 +00:00
|
|
|
struct thread_info *ti = task_thread_info(tsk);
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long ret = 0xdeadbeefUL;
|
|
|
|
|
|
|
|
if (ti && ti->ksp) {
|
|
|
|
unsigned long *sp;
|
|
|
|
sp = (unsigned long *)(ti->ksp + STACK_BIAS);
|
|
|
|
if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL &&
|
|
|
|
sp[14]) {
|
|
|
|
unsigned long *fp;
|
|
|
|
fp = (unsigned long *)(sp[14] + STACK_BIAS);
|
|
|
|
if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL)
|
|
|
|
ret = fp[15];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Free current thread data structures etc.. */
|
|
|
|
void exit_thread(void)
|
|
|
|
{
|
|
|
|
struct thread_info *t = current_thread_info();
|
|
|
|
|
|
|
|
if (t->utraps) {
|
|
|
|
if (t->utraps[0] < 2)
|
|
|
|
kfree (t->utraps);
|
|
|
|
else
|
|
|
|
t->utraps[0]--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void flush_thread(void)
|
|
|
|
{
|
|
|
|
struct thread_info *t = current_thread_info();
|
2006-02-01 02:29:18 +00:00
|
|
|
struct mm_struct *mm;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-02-01 02:29:18 +00:00
|
|
|
mm = t->task->mm;
|
|
|
|
if (mm)
|
2006-02-01 02:31:20 +00:00
|
|
|
tsb_context_switch(mm);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
set_thread_wsaved(0);
|
|
|
|
|
|
|
|
/* Clear FPU register state. */
|
|
|
|
t->fpsaved[0] = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* It's a bit more tricky when 64-bit tasks are involved... */
|
|
|
|
static unsigned long clone_stackframe(unsigned long csp, unsigned long psp)
|
|
|
|
{
|
|
|
|
unsigned long fp, distance, rval;
|
|
|
|
|
|
|
|
if (!(test_thread_flag(TIF_32BIT))) {
|
|
|
|
csp += STACK_BIAS;
|
|
|
|
psp += STACK_BIAS;
|
|
|
|
__get_user(fp, &(((struct reg_window __user *)psp)->ins[6]));
|
|
|
|
fp += STACK_BIAS;
|
|
|
|
} else
|
|
|
|
__get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6]));
|
|
|
|
|
2010-02-10 00:18:40 +00:00
|
|
|
/* Now align the stack as this is mandatory in the Sparc ABI
|
|
|
|
* due to how register windows work. This hides the
|
|
|
|
* restriction from thread libraries etc.
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
2010-02-10 00:18:40 +00:00
|
|
|
csp &= ~15UL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
distance = fp - psp;
|
|
|
|
rval = (csp - distance);
|
|
|
|
if (copy_in_user((void __user *) rval, (void __user *) psp, distance))
|
|
|
|
rval = 0;
|
|
|
|
else if (test_thread_flag(TIF_32BIT)) {
|
|
|
|
if (put_user(((u32)csp),
|
|
|
|
&(((struct reg_window32 __user *)rval)->ins[6])))
|
|
|
|
rval = 0;
|
|
|
|
} else {
|
|
|
|
if (put_user(((u64)csp - STACK_BIAS),
|
|
|
|
&(((struct reg_window __user *)rval)->ins[6])))
|
|
|
|
rval = 0;
|
|
|
|
else
|
|
|
|
rval = rval - STACK_BIAS;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rval;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Standard stuff. */
|
|
|
|
static inline void shift_window_buffer(int first_win, int last_win,
|
|
|
|
struct thread_info *t)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = first_win; i < last_win; i++) {
|
|
|
|
t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1];
|
|
|
|
memcpy(&t->reg_window[i], &t->reg_window[i+1],
|
|
|
|
sizeof(struct reg_window));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void synchronize_user_stack(void)
|
|
|
|
{
|
|
|
|
struct thread_info *t = current_thread_info();
|
|
|
|
unsigned long window;
|
|
|
|
|
|
|
|
flush_user_windows();
|
|
|
|
if ((window = get_thread_wsaved()) != 0) {
|
|
|
|
int winsize = sizeof(struct reg_window);
|
|
|
|
int bias = 0;
|
|
|
|
|
|
|
|
if (test_thread_flag(TIF_32BIT))
|
|
|
|
winsize = sizeof(struct reg_window32);
|
|
|
|
else
|
|
|
|
bias = STACK_BIAS;
|
|
|
|
|
|
|
|
window -= 1;
|
|
|
|
do {
|
|
|
|
unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
|
|
|
|
struct reg_window *rwin = &t->reg_window[window];
|
|
|
|
|
|
|
|
if (!copy_to_user((char __user *)sp, rwin, winsize)) {
|
|
|
|
shift_window_buffer(window, get_thread_wsaved() - 1, t);
|
|
|
|
set_thread_wsaved(get_thread_wsaved() - 1);
|
|
|
|
}
|
|
|
|
} while (window--);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-02-04 08:10:01 +00:00
|
|
|
static void stack_unaligned(unsigned long sp)
|
|
|
|
{
|
|
|
|
siginfo_t info;
|
|
|
|
|
|
|
|
info.si_signo = SIGBUS;
|
|
|
|
info.si_errno = 0;
|
|
|
|
info.si_code = BUS_ADRALN;
|
|
|
|
info.si_addr = (void __user *) sp;
|
|
|
|
info.si_trapno = 0;
|
|
|
|
force_sig_info(SIGBUS, &info, current);
|
|
|
|
}
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
void fault_in_user_windows(void)
|
|
|
|
{
|
|
|
|
struct thread_info *t = current_thread_info();
|
|
|
|
unsigned long window;
|
|
|
|
int winsize = sizeof(struct reg_window);
|
|
|
|
int bias = 0;
|
|
|
|
|
|
|
|
if (test_thread_flag(TIF_32BIT))
|
|
|
|
winsize = sizeof(struct reg_window32);
|
|
|
|
else
|
|
|
|
bias = STACK_BIAS;
|
|
|
|
|
|
|
|
flush_user_windows();
|
|
|
|
window = get_thread_wsaved();
|
|
|
|
|
2006-02-04 08:10:01 +00:00
|
|
|
if (likely(window != 0)) {
|
2005-04-16 22:20:36 +00:00
|
|
|
window -= 1;
|
|
|
|
do {
|
|
|
|
unsigned long sp = (t->rwbuf_stkptrs[window] + bias);
|
|
|
|
struct reg_window *rwin = &t->reg_window[window];
|
|
|
|
|
2006-02-04 08:10:01 +00:00
|
|
|
if (unlikely(sp & 0x7UL))
|
|
|
|
stack_unaligned(sp);
|
|
|
|
|
|
|
|
if (unlikely(copy_to_user((char __user *)sp,
|
|
|
|
rwin, winsize)))
|
2005-04-16 22:20:36 +00:00
|
|
|
goto barf;
|
|
|
|
} while (window--);
|
|
|
|
}
|
|
|
|
set_thread_wsaved(0);
|
|
|
|
return;
|
|
|
|
|
|
|
|
barf:
|
|
|
|
set_thread_wsaved(window + 1);
|
|
|
|
do_exit(SIGILL);
|
|
|
|
}
|
|
|
|
|
|
|
|
asmlinkage long sparc_do_fork(unsigned long clone_flags,
|
|
|
|
unsigned long stack_start,
|
|
|
|
struct pt_regs *regs,
|
|
|
|
unsigned long stack_size)
|
|
|
|
{
|
|
|
|
int __user *parent_tid_ptr, *child_tid_ptr;
|
2008-05-07 23:21:28 +00:00
|
|
|
unsigned long orig_i1 = regs->u_regs[UREG_I1];
|
|
|
|
long ret;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
|
|
parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]);
|
|
|
|
child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]);
|
|
|
|
} else
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2];
|
|
|
|
child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
|
|
|
|
}
|
|
|
|
|
2008-05-07 23:21:28 +00:00
|
|
|
ret = do_fork(clone_flags, stack_start,
|
|
|
|
regs, stack_size,
|
|
|
|
parent_tid_ptr, child_tid_ptr);
|
|
|
|
|
|
|
|
/* If we get an error and potentially restart the system
|
|
|
|
* call, we're screwed because copy_thread() clobbered
|
|
|
|
* the parent's %o1. So detect that case and restore it
|
|
|
|
* here.
|
|
|
|
*/
|
|
|
|
if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
|
|
|
|
regs->u_regs[UREG_I1] = orig_i1;
|
|
|
|
|
|
|
|
return ret;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Copy a Sparc thread. The fork() return value conventions
|
|
|
|
* under SunOS are nothing short of bletcherous:
|
|
|
|
* Parent --> %o0 == childs pid, %o1 == 0
|
|
|
|
* Child --> %o0 == parents pid, %o1 == 1
|
|
|
|
*/
|
2009-04-02 23:56:59 +00:00
|
|
|
int copy_thread(unsigned long clone_flags, unsigned long sp,
|
2005-04-16 22:20:36 +00:00
|
|
|
unsigned long unused,
|
|
|
|
struct task_struct *p, struct pt_regs *regs)
|
|
|
|
{
|
2006-01-12 09:05:43 +00:00
|
|
|
struct thread_info *t = task_thread_info(p);
|
2008-05-22 01:14:28 +00:00
|
|
|
struct sparc_stackf *parent_sf;
|
|
|
|
unsigned long child_stack_sz;
|
2005-04-16 22:20:36 +00:00
|
|
|
char *child_trap_frame;
|
2008-05-22 01:14:28 +00:00
|
|
|
int kernel_thread;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-05-22 01:14:28 +00:00
|
|
|
kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
|
|
|
|
parent_sf = ((struct sparc_stackf *) regs) - 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2008-05-22 01:14:28 +00:00
|
|
|
/* Calculate offset to stack_frame & pt_regs */
|
|
|
|
child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) +
|
|
|
|
(kernel_thread ? STACKFRAME_SZ : 0));
|
|
|
|
child_trap_frame = (task_stack_page(p) +
|
|
|
|
(THREAD_SIZE - child_stack_sz));
|
|
|
|
memcpy(child_trap_frame, parent_sf, child_stack_sz);
|
|
|
|
|
|
|
|
t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) |
|
|
|
|
(0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
|
2005-04-16 22:20:36 +00:00
|
|
|
(((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT);
|
2005-07-25 02:36:26 +00:00
|
|
|
t->new_child = 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS;
|
2008-05-22 01:14:28 +00:00
|
|
|
t->kregs = (struct pt_regs *) (child_trap_frame +
|
|
|
|
sizeof(struct sparc_stackf));
|
2005-04-16 22:20:36 +00:00
|
|
|
t->fpsaved[0] = 0;
|
|
|
|
|
2008-05-22 01:14:28 +00:00
|
|
|
if (kernel_thread) {
|
|
|
|
struct sparc_stackf *child_sf = (struct sparc_stackf *)
|
|
|
|
(child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ));
|
|
|
|
|
|
|
|
/* Zero terminate the stack backtrace. */
|
|
|
|
child_sf->fp = NULL;
|
|
|
|
t->kregs->u_regs[UREG_FP] =
|
|
|
|
((unsigned long) child_sf) - STACK_BIAS;
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
|
|
|
|
t->kregs->u_regs[UREG_G6] = (unsigned long) t;
|
|
|
|
t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
|
|
|
|
} else {
|
|
|
|
if (t->flags & _TIF_32BIT) {
|
|
|
|
sp &= 0x00000000ffffffffUL;
|
|
|
|
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
|
|
|
|
}
|
|
|
|
t->kregs->u_regs[UREG_FP] = sp;
|
|
|
|
t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT);
|
|
|
|
if (sp != regs->u_regs[UREG_FP]) {
|
|
|
|
unsigned long csp;
|
|
|
|
|
|
|
|
csp = clone_stackframe(sp, regs->u_regs[UREG_FP]);
|
|
|
|
if (!csp)
|
|
|
|
return -EFAULT;
|
|
|
|
t->kregs->u_regs[UREG_FP] = csp;
|
|
|
|
}
|
|
|
|
if (t->utraps)
|
|
|
|
t->utraps[0]++;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Set the return value for the child. */
|
|
|
|
t->kregs->u_regs[UREG_I0] = current->pid;
|
|
|
|
t->kregs->u_regs[UREG_I1] = 1;
|
|
|
|
|
|
|
|
/* Set the second return value for the parent. */
|
|
|
|
regs->u_regs[UREG_I1] = 0;
|
|
|
|
|
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
|
|
t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This is the mechanism for creating a new kernel thread.
|
|
|
|
*
|
|
|
|
* NOTE! Only a kernel-only process(ie the swapper or direct descendants
|
|
|
|
* who haven't done an "execve()") should use this: it will work within
|
|
|
|
* a system call from a "real" process, but the process memory space will
|
2007-05-11 20:52:08 +00:00
|
|
|
* not be freed until both the parent and the child have exited.
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
|
|
|
pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
|
|
|
|
{
|
|
|
|
long retval;
|
|
|
|
|
|
|
|
/* If the parent runs before fn(arg) is called by the child,
|
|
|
|
* the input registers of this function can be clobbered.
|
|
|
|
* So we stash 'fn' and 'arg' into global registers which
|
|
|
|
* will not be modified by the parent.
|
|
|
|
*/
|
|
|
|
__asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */
|
|
|
|
"mov %5, %%g3\n\t" /* Save ARG into global */
|
|
|
|
"mov %1, %%g1\n\t" /* Clone syscall nr. */
|
|
|
|
"mov %2, %%o0\n\t" /* Clone flags. */
|
|
|
|
"mov 0, %%o1\n\t" /* usp arg == 0 */
|
|
|
|
"t 0x6d\n\t" /* Linux/Sparc clone(). */
|
|
|
|
"brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */
|
|
|
|
" mov %%o0, %0\n\t"
|
|
|
|
"jmpl %%g2, %%o7\n\t" /* Call the function. */
|
|
|
|
" mov %%g3, %%o0\n\t" /* Set arg in delay. */
|
|
|
|
"mov %3, %%g1\n\t"
|
|
|
|
"t 0x6d\n\t" /* Linux/Sparc exit(). */
|
|
|
|
/* Notreached by child. */
|
|
|
|
"1:" :
|
|
|
|
"=r" (retval) :
|
|
|
|
"i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
|
|
|
|
"i" (__NR_exit), "r" (fn), "r" (arg) :
|
|
|
|
"g1", "g2", "g3", "o0", "o1", "memory", "cc");
|
|
|
|
return retval;
|
|
|
|
}
|
2009-01-09 00:58:20 +00:00
|
|
|
EXPORT_SYMBOL(kernel_thread);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
typedef struct {
|
|
|
|
union {
|
|
|
|
unsigned int pr_regs[32];
|
|
|
|
unsigned long pr_dregs[16];
|
|
|
|
} pr_fr;
|
|
|
|
unsigned int __unused;
|
|
|
|
unsigned int pr_fsr;
|
|
|
|
unsigned char pr_qcnt;
|
|
|
|
unsigned char pr_q_entrysize;
|
|
|
|
unsigned char pr_en;
|
|
|
|
unsigned int pr_q[64];
|
|
|
|
} elf_fpregset_t32;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* fill in the fpu structure for a core dump.
|
|
|
|
*/
|
|
|
|
int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
|
|
|
|
{
|
|
|
|
unsigned long *kfpregs = current_thread_info()->fpregs;
|
|
|
|
unsigned long fprs = current_thread_info()->fpsaved[0];
|
|
|
|
|
|
|
|
if (test_thread_flag(TIF_32BIT)) {
|
|
|
|
elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs;
|
|
|
|
|
|
|
|
if (fprs & FPRS_DL)
|
|
|
|
memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
else
|
|
|
|
memset(&fpregs32->pr_fr.pr_regs[0], 0,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
fpregs32->pr_qcnt = 0;
|
|
|
|
fpregs32->pr_q_entrysize = 8;
|
|
|
|
memset(&fpregs32->pr_q[0], 0,
|
|
|
|
(sizeof(unsigned int) * 64));
|
|
|
|
if (fprs & FPRS_FEF) {
|
|
|
|
fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0];
|
|
|
|
fpregs32->pr_en = 1;
|
|
|
|
} else {
|
|
|
|
fpregs32->pr_fsr = 0;
|
|
|
|
fpregs32->pr_en = 0;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
if(fprs & FPRS_DL)
|
|
|
|
memcpy(&fpregs->pr_regs[0], kfpregs,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
else
|
|
|
|
memset(&fpregs->pr_regs[0], 0,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
if(fprs & FPRS_DU)
|
|
|
|
memcpy(&fpregs->pr_regs[16], kfpregs+16,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
else
|
|
|
|
memset(&fpregs->pr_regs[16], 0,
|
|
|
|
sizeof(unsigned int) * 32);
|
|
|
|
if(fprs & FPRS_FEF) {
|
|
|
|
fpregs->pr_fsr = current_thread_info()->xfsr[0];
|
|
|
|
fpregs->pr_gsr = current_thread_info()->gsr[0];
|
|
|
|
} else {
|
|
|
|
fpregs->pr_fsr = fpregs->pr_gsr = 0;
|
|
|
|
}
|
|
|
|
fpregs->pr_fprs = fprs;
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
2009-01-09 00:58:20 +00:00
|
|
|
EXPORT_SYMBOL(dump_fpu);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* sparc_execve() executes a new program after the asm stub has set
|
|
|
|
* things up for us. This should basically do what I want it to.
|
|
|
|
*/
|
|
|
|
asmlinkage int sparc_execve(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
int error, base = 0;
|
|
|
|
char *filename;
|
|
|
|
|
|
|
|
/* User register window flush is done by entry.S */
|
|
|
|
|
|
|
|
/* Check for indirect call. */
|
|
|
|
if (regs->u_regs[UREG_G1] == 0)
|
|
|
|
base = 1;
|
|
|
|
|
|
|
|
filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
|
|
|
|
error = PTR_ERR(filename);
|
|
|
|
if (IS_ERR(filename))
|
|
|
|
goto out;
|
|
|
|
error = do_execve(filename,
|
2010-08-17 22:52:56 +00:00
|
|
|
(const char __user *const __user *)
|
2005-04-16 22:20:36 +00:00
|
|
|
regs->u_regs[base + UREG_I1],
|
2010-08-17 22:52:56 +00:00
|
|
|
(const char __user *const __user *)
|
2005-04-16 22:20:36 +00:00
|
|
|
regs->u_regs[base + UREG_I2], regs);
|
|
|
|
putname(filename);
|
|
|
|
if (!error) {
|
|
|
|
fprs_write(0);
|
|
|
|
current_thread_info()->xfsr[0] = 0;
|
|
|
|
current_thread_info()->fpsaved[0] = 0;
|
|
|
|
regs->tstate &= ~TSTATE_PEF;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned long get_wchan(struct task_struct *task)
|
|
|
|
{
|
|
|
|
unsigned long pc, fp, bias = 0;
|
2008-08-13 01:33:56 +00:00
|
|
|
struct thread_info *tp;
|
2005-04-16 22:20:36 +00:00
|
|
|
struct reg_window *rw;
|
|
|
|
unsigned long ret = 0;
|
|
|
|
int count = 0;
|
|
|
|
|
|
|
|
if (!task || task == current ||
|
|
|
|
task->state == TASK_RUNNING)
|
|
|
|
goto out;
|
|
|
|
|
2008-08-13 01:33:56 +00:00
|
|
|
tp = task_thread_info(task);
|
2005-04-16 22:20:36 +00:00
|
|
|
bias = STACK_BIAS;
|
2006-01-12 09:05:42 +00:00
|
|
|
fp = task_thread_info(task)->ksp + bias;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
do {
|
2008-08-13 01:33:56 +00:00
|
|
|
if (!kstack_valid(tp, fp))
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
rw = (struct reg_window *) fp;
|
|
|
|
pc = rw->ins[7];
|
|
|
|
if (!in_sched_functions(pc)) {
|
|
|
|
ret = pc;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
fp = rw->ins[6] + bias;
|
|
|
|
} while (++count < 16);
|
|
|
|
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|