![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>
194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
/*
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* linux/arch/cris/kernel/process.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright (C) 2000-2002 Axis Communications AB
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*
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* Authors: Bjorn Wesen (bjornw@axis.com)
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* Mikael Starvik (starvik@axis.com)
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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/sched.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <arch/svinto.h>
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#include <linux/init.h>
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#include <arch/system.h>
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#include <linux/ptrace.h>
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#ifdef CONFIG_ETRAX_GPIO
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void etrax_gpio_wake_up_check(void); /* drivers/gpio.c */
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#endif
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/*
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* We use this if we don't have any better
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* idle routine..
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*/
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void default_idle(void)
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{
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#ifdef CONFIG_ETRAX_GPIO
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etrax_gpio_wake_up_check();
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#endif
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local_irq_enable();
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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 needs to be done. */
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}
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/* if the watchdog is enabled, we can simply disable interrupts and go
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* into an eternal loop, and the watchdog will reset the CPU after 0.1s
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* if on the other hand the watchdog wasn't enabled, we just enable it and wait
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*/
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void hard_reset_now (void)
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{
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/*
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* Don't declare this variable elsewhere. We don't want any other
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* code to know about it than the watchdog handler in entry.S and
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* this code, implementing hard reset through the watchdog.
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*/
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#if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM)
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extern int cause_of_death;
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#endif
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printk("*** HARD RESET ***\n");
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local_irq_disable();
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#if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM)
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cause_of_death = 0xbedead;
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#else
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/* Since we dont plan to keep on resetting the watchdog,
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the key can be arbitrary hence three */
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*R_WATCHDOG = IO_FIELD(R_WATCHDOG, key, 3) |
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IO_STATE(R_WATCHDOG, enable, start);
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#endif
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while(1) /* waiting for RETRIBUTION! */ ;
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}
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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 *t)
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{
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return task_pt_regs(t)->irp;
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}
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/* setup the child's kernel stack with a pt_regs and switch_stack on it.
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* it will be un-nested during _resume and _ret_from_sys_call when the
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* new thread is scheduled.
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*
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* also setup the thread switching structure which is used to keep
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* thread-specific data during _resumes.
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*
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*/
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asmlinkage void ret_from_fork(void);
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asmlinkage void ret_from_kernel_thread(void);
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int copy_thread(unsigned long clone_flags, unsigned long usp,
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unsigned long arg, struct task_struct *p)
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{
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struct pt_regs *childregs = task_pt_regs(p);
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struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1;
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/* put the pt_regs structure at the end of the new kernel stack page and fix it up
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* remember that the task_struct doubles as the kernel stack for the task
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*/
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if (unlikely(p->flags & PF_KTHREAD)) {
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memset(swstack, 0,
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sizeof(struct switch_stack) + sizeof(struct pt_regs));
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swstack->r1 = usp;
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swstack->r2 = arg;
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childregs->dccr = 1 << I_DCCR_BITNR;
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swstack->return_ip = (unsigned long) ret_from_kernel_thread;
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p->thread.ksp = (unsigned long) swstack;
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p->thread.usp = 0;
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return 0;
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}
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*childregs = *current_pt_regs(); /* struct copy of pt_regs */
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childregs->r10 = 0; /* child returns 0 after a fork/clone */
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/* put the switch stack right below the pt_regs */
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swstack->r9 = 0; /* parameter to ret_from_sys_call, 0 == dont restart the syscall */
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/* we want to return into ret_from_sys_call after the _resume */
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swstack->return_ip = (unsigned long) ret_from_fork; /* Will call ret_from_sys_call */
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/* fix the user-mode stackpointer */
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p->thread.usp = usp ?: rdusp();
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/* and the kernel-mode one */
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p->thread.ksp = (unsigned long) swstack;
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#ifdef DEBUG
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printk("copy_thread: new regs at 0x%p, as shown below:\n", childregs);
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show_registers(childregs);
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#endif
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return 0;
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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#if 0
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/* YURGH. TODO. */
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unsigned long ebp, esp, eip;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)p;
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esp = p->thread.esp;
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if (!stack_page || esp < stack_page || esp > 8188+stack_page)
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return 0;
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/* include/asm-i386/system.h:switch_to() pushes ebp last. */
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ebp = *(unsigned long *) esp;
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do {
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if (ebp < stack_page || ebp > 8184+stack_page)
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return 0;
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eip = *(unsigned long *) (ebp+4);
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if (!in_sched_functions(eip))
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return eip;
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ebp = *(unsigned long *) ebp;
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} while (count++ < 16);
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#endif
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return 0;
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}
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#undef last_sched
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#undef first_sched
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void show_regs(struct pt_regs * regs)
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{
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unsigned long usp = rdusp();
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show_regs_print_info(KERN_DEFAULT);
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printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
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regs->irp, regs->srp, regs->dccr, usp, regs->mof );
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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 r13: %08lx oR10: %08lx\n",
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regs->r12, regs->r13, regs->orig_r10);
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}
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