![Tejun Heo](/assets/img/avatar_default.png)
show_regs() is inherently arch-dependent but it does make sense to print generic debug information and some archs already do albeit in slightly different forms. This patch introduces a generic function to print debug information from show_regs() so that different archs print out the same information and it's much easier to modify what's printed. show_regs_print_info() prints out the same debug info as dump_stack() does plus task and thread_info pointers. * Archs which didn't print debug info now do. alpha, arc, blackfin, c6x, cris, frv, h8300, hexagon, ia64, m32r, metag, microblaze, mn10300, openrisc, parisc, score, sh64, sparc, um, xtensa * Already prints debug info. Replaced with show_regs_print_info(). The printed information is superset of what used to be there. arm, arm64, avr32, mips, powerpc, sh32, tile, unicore32, x86 * s390 is special in that it used to print arch-specific information along with generic debug info. Heiko and Martin think that the arch-specific extra isn't worth keeping s390 specfic implementation. Converted to use the generic version. Note that now all archs print the debug info before actual register dumps. An example BUG() dump follows. kernel BUG at /work/os/work/kernel/workqueue.c:4841! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #7 Hardware name: empty empty/S3992, BIOS 080011 10/26/2007 task: ffff88007c85e040 ti: ffff88007c860000 task.ti: ffff88007c860000 RIP: 0010:[<ffffffff8234a07e>] [<ffffffff8234a07e>] init_workqueues+0x4/0x6 RSP: 0000:ffff88007c861ec8 EFLAGS: 00010246 RAX: ffff88007c861fd8 RBX: ffffffff824466a8 RCX: 0000000000000001 RDX: 0000000000000046 RSI: 0000000000000001 RDI: ffffffff8234a07a RBP: ffff88007c861ec8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8234a07a R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88007dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88015f7ff000 CR3: 00000000021f1000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffff88007c861ef8 ffffffff81000312 ffffffff824466a8 ffff88007c85e650 0000000000000003 0000000000000000 ffff88007c861f38 ffffffff82335e5d ffff88007c862080 ffffffff8223d8c0 ffff88007c862080 ffffffff81c47760 Call Trace: [<ffffffff81000312>] do_one_initcall+0x122/0x170 [<ffffffff82335e5d>] kernel_init_freeable+0x9b/0x1c8 [<ffffffff81c47760>] ? rest_init+0x140/0x140 [<ffffffff81c4776e>] kernel_init+0xe/0xf0 [<ffffffff81c6be9c>] ret_from_fork+0x7c/0xb0 [<ffffffff81c47760>] ? rest_init+0x140/0x140 ... v2: Typo fix in x86-32. v3: CPU number dropped from show_regs_print_info() as dump_stack_print_info() has been updated to print it. s390 specific implementation dropped as requested by s390 maintainers. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> [tile bits] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
193 lines
4.2 KiB
C
193 lines
4.2 KiB
C
/* MN10300 Process handling code
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/io.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/reset-regs.h>
|
|
#include <asm/gdb-stub.h>
|
|
#include "internal.h"
|
|
|
|
/*
|
|
* return saved PC of a blocked thread.
|
|
*/
|
|
unsigned long thread_saved_pc(struct task_struct *tsk)
|
|
{
|
|
return ((unsigned long *) tsk->thread.sp)[3];
|
|
}
|
|
|
|
/*
|
|
* power off function, if any
|
|
*/
|
|
void (*pm_power_off)(void);
|
|
EXPORT_SYMBOL(pm_power_off);
|
|
|
|
/*
|
|
* On SMP it's slightly faster (but much more power-consuming!)
|
|
* to poll the ->work.need_resched flag instead of waiting for the
|
|
* cross-CPU IPI to arrive. Use this option with caution.
|
|
*
|
|
* tglx: No idea why this depends on HOTPLUG_CPU !?!
|
|
*/
|
|
#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
|
|
void arch_cpu_idle(void)
|
|
{
|
|
safe_halt();
|
|
}
|
|
#endif
|
|
|
|
void release_segments(struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
void machine_restart(char *cmd)
|
|
{
|
|
#ifdef CONFIG_KERNEL_DEBUGGER
|
|
gdbstub_exit(0);
|
|
#endif
|
|
|
|
#ifdef mn10300_unit_hard_reset
|
|
mn10300_unit_hard_reset();
|
|
#else
|
|
mn10300_proc_hard_reset();
|
|
#endif
|
|
}
|
|
|
|
void machine_halt(void)
|
|
{
|
|
#ifdef CONFIG_KERNEL_DEBUGGER
|
|
gdbstub_exit(0);
|
|
#endif
|
|
}
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
#ifdef CONFIG_KERNEL_DEBUGGER
|
|
gdbstub_exit(0);
|
|
#endif
|
|
}
|
|
|
|
void show_regs(struct pt_regs *regs)
|
|
{
|
|
show_regs_print_info(KERN_DEFAULT);
|
|
}
|
|
|
|
/*
|
|
* free current thread data structures etc..
|
|
*/
|
|
void exit_thread(void)
|
|
{
|
|
exit_fpu();
|
|
}
|
|
|
|
void flush_thread(void)
|
|
{
|
|
flush_fpu();
|
|
}
|
|
|
|
void release_thread(struct task_struct *dead_task)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* we do not have to muck with descriptors here, that is
|
|
* done in switch_mm() as needed.
|
|
*/
|
|
void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* this gets called so that we can store lazy state into memory and copy the
|
|
* current task into the new thread.
|
|
*/
|
|
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
|
|
{
|
|
unlazy_fpu(src);
|
|
*dst = *src;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* set up the kernel stack for a new thread and copy arch-specific thread
|
|
* control information
|
|
*/
|
|
int copy_thread(unsigned long clone_flags,
|
|
unsigned long c_usp, unsigned long ustk_size,
|
|
struct task_struct *p)
|
|
{
|
|
struct thread_info *ti = task_thread_info(p);
|
|
struct pt_regs *c_regs;
|
|
unsigned long c_ksp;
|
|
|
|
c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
|
|
|
|
/* allocate the userspace exception frame and set it up */
|
|
c_ksp -= sizeof(struct pt_regs);
|
|
c_regs = (struct pt_regs *) c_ksp;
|
|
c_ksp -= 12; /* allocate function call ABI slack */
|
|
|
|
/* set up things up so the scheduler can start the new task */
|
|
p->thread.uregs = c_regs;
|
|
ti->frame = c_regs;
|
|
p->thread.a3 = (unsigned long) c_regs;
|
|
p->thread.sp = c_ksp;
|
|
p->thread.wchan = p->thread.pc;
|
|
p->thread.usp = c_usp;
|
|
|
|
if (unlikely(p->flags & PF_KTHREAD)) {
|
|
memset(c_regs, 0, sizeof(struct pt_regs));
|
|
c_regs->a0 = c_usp; /* function */
|
|
c_regs->d0 = ustk_size; /* argument */
|
|
local_save_flags(c_regs->epsw);
|
|
c_regs->epsw |= EPSW_IE | EPSW_IM_7;
|
|
p->thread.pc = (unsigned long) ret_from_kernel_thread;
|
|
return 0;
|
|
}
|
|
*c_regs = *current_pt_regs();
|
|
if (c_usp)
|
|
c_regs->sp = c_usp;
|
|
c_regs->epsw &= ~EPSW_FE; /* my FPU */
|
|
|
|
/* the new TLS pointer is passed in as arg #5 to sys_clone() */
|
|
if (clone_flags & CLONE_SETTLS)
|
|
c_regs->e2 = current_frame()->d3;
|
|
|
|
p->thread.pc = (unsigned long) ret_from_fork;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long get_wchan(struct task_struct *p)
|
|
{
|
|
return p->thread.wchan;
|
|
}
|