linux/arch/sh/kernel/process_64.c
Tejun Heo a43cb95d54 dump_stack: unify debug information printed by show_regs()
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>
2013-04-30 17:04:02 -07:00

463 lines
14 KiB
C

/*
* arch/sh/kernel/process_64.c
*
* This file handles the architecture-dependent parts of process handling..
*
* Copyright (C) 2000, 2001 Paolo Alberelli
* Copyright (C) 2003 - 2007 Paul Mundt
* Copyright (C) 2003, 2004 Richard Curnow
*
* Started from SH3/4 version:
* Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
*
* In turn started from i386 version:
* Copyright (C) 1995 Linus Torvalds
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <asm/syscalls.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/fpu.h>
#include <asm/switch_to.h>
struct task_struct *last_task_used_math = NULL;
struct pt_regs fake_swapper_regs = { 0, };
void show_regs(struct pt_regs *regs)
{
unsigned long long ah, al, bh, bl, ch, cl;
printk("\n");
show_regs_print_info(KERN_DEFAULT);
ah = (regs->pc) >> 32;
al = (regs->pc) & 0xffffffff;
bh = (regs->regs[18]) >> 32;
bl = (regs->regs[18]) & 0xffffffff;
ch = (regs->regs[15]) >> 32;
cl = (regs->regs[15]) & 0xffffffff;
printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->sr) >> 32;
al = (regs->sr) & 0xffffffff;
asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
bh = (bh) >> 32;
bl = (bl) & 0xffffffff;
asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
ch = (ch) >> 32;
cl = (cl) & 0xffffffff;
printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[0]) >> 32;
al = (regs->regs[0]) & 0xffffffff;
bh = (regs->regs[1]) >> 32;
bl = (regs->regs[1]) & 0xffffffff;
ch = (regs->regs[2]) >> 32;
cl = (regs->regs[2]) & 0xffffffff;
printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[3]) >> 32;
al = (regs->regs[3]) & 0xffffffff;
bh = (regs->regs[4]) >> 32;
bl = (regs->regs[4]) & 0xffffffff;
ch = (regs->regs[5]) >> 32;
cl = (regs->regs[5]) & 0xffffffff;
printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[6]) >> 32;
al = (regs->regs[6]) & 0xffffffff;
bh = (regs->regs[7]) >> 32;
bl = (regs->regs[7]) & 0xffffffff;
ch = (regs->regs[8]) >> 32;
cl = (regs->regs[8]) & 0xffffffff;
printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[9]) >> 32;
al = (regs->regs[9]) & 0xffffffff;
bh = (regs->regs[10]) >> 32;
bl = (regs->regs[10]) & 0xffffffff;
ch = (regs->regs[11]) >> 32;
cl = (regs->regs[11]) & 0xffffffff;
printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[12]) >> 32;
al = (regs->regs[12]) & 0xffffffff;
bh = (regs->regs[13]) >> 32;
bl = (regs->regs[13]) & 0xffffffff;
ch = (regs->regs[14]) >> 32;
cl = (regs->regs[14]) & 0xffffffff;
printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[16]) >> 32;
al = (regs->regs[16]) & 0xffffffff;
bh = (regs->regs[17]) >> 32;
bl = (regs->regs[17]) & 0xffffffff;
ch = (regs->regs[19]) >> 32;
cl = (regs->regs[19]) & 0xffffffff;
printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[20]) >> 32;
al = (regs->regs[20]) & 0xffffffff;
bh = (regs->regs[21]) >> 32;
bl = (regs->regs[21]) & 0xffffffff;
ch = (regs->regs[22]) >> 32;
cl = (regs->regs[22]) & 0xffffffff;
printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[23]) >> 32;
al = (regs->regs[23]) & 0xffffffff;
bh = (regs->regs[24]) >> 32;
bl = (regs->regs[24]) & 0xffffffff;
ch = (regs->regs[25]) >> 32;
cl = (regs->regs[25]) & 0xffffffff;
printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[26]) >> 32;
al = (regs->regs[26]) & 0xffffffff;
bh = (regs->regs[27]) >> 32;
bl = (regs->regs[27]) & 0xffffffff;
ch = (regs->regs[28]) >> 32;
cl = (regs->regs[28]) & 0xffffffff;
printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[29]) >> 32;
al = (regs->regs[29]) & 0xffffffff;
bh = (regs->regs[30]) >> 32;
bl = (regs->regs[30]) & 0xffffffff;
ch = (regs->regs[31]) >> 32;
cl = (regs->regs[31]) & 0xffffffff;
printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[32]) >> 32;
al = (regs->regs[32]) & 0xffffffff;
bh = (regs->regs[33]) >> 32;
bl = (regs->regs[33]) & 0xffffffff;
ch = (regs->regs[34]) >> 32;
cl = (regs->regs[34]) & 0xffffffff;
printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[35]) >> 32;
al = (regs->regs[35]) & 0xffffffff;
bh = (regs->regs[36]) >> 32;
bl = (regs->regs[36]) & 0xffffffff;
ch = (regs->regs[37]) >> 32;
cl = (regs->regs[37]) & 0xffffffff;
printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[38]) >> 32;
al = (regs->regs[38]) & 0xffffffff;
bh = (regs->regs[39]) >> 32;
bl = (regs->regs[39]) & 0xffffffff;
ch = (regs->regs[40]) >> 32;
cl = (regs->regs[40]) & 0xffffffff;
printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[41]) >> 32;
al = (regs->regs[41]) & 0xffffffff;
bh = (regs->regs[42]) >> 32;
bl = (regs->regs[42]) & 0xffffffff;
ch = (regs->regs[43]) >> 32;
cl = (regs->regs[43]) & 0xffffffff;
printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[44]) >> 32;
al = (regs->regs[44]) & 0xffffffff;
bh = (regs->regs[45]) >> 32;
bl = (regs->regs[45]) & 0xffffffff;
ch = (regs->regs[46]) >> 32;
cl = (regs->regs[46]) & 0xffffffff;
printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[47]) >> 32;
al = (regs->regs[47]) & 0xffffffff;
bh = (regs->regs[48]) >> 32;
bl = (regs->regs[48]) & 0xffffffff;
ch = (regs->regs[49]) >> 32;
cl = (regs->regs[49]) & 0xffffffff;
printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[50]) >> 32;
al = (regs->regs[50]) & 0xffffffff;
bh = (regs->regs[51]) >> 32;
bl = (regs->regs[51]) & 0xffffffff;
ch = (regs->regs[52]) >> 32;
cl = (regs->regs[52]) & 0xffffffff;
printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[53]) >> 32;
al = (regs->regs[53]) & 0xffffffff;
bh = (regs->regs[54]) >> 32;
bl = (regs->regs[54]) & 0xffffffff;
ch = (regs->regs[55]) >> 32;
cl = (regs->regs[55]) & 0xffffffff;
printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[56]) >> 32;
al = (regs->regs[56]) & 0xffffffff;
bh = (regs->regs[57]) >> 32;
bl = (regs->regs[57]) & 0xffffffff;
ch = (regs->regs[58]) >> 32;
cl = (regs->regs[58]) & 0xffffffff;
printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[59]) >> 32;
al = (regs->regs[59]) & 0xffffffff;
bh = (regs->regs[60]) >> 32;
bl = (regs->regs[60]) & 0xffffffff;
ch = (regs->regs[61]) >> 32;
cl = (regs->regs[61]) & 0xffffffff;
printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->regs[62]) >> 32;
al = (regs->regs[62]) & 0xffffffff;
bh = (regs->tregs[0]) >> 32;
bl = (regs->tregs[0]) & 0xffffffff;
ch = (regs->tregs[1]) >> 32;
cl = (regs->tregs[1]) & 0xffffffff;
printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->tregs[2]) >> 32;
al = (regs->tregs[2]) & 0xffffffff;
bh = (regs->tregs[3]) >> 32;
bl = (regs->tregs[3]) & 0xffffffff;
ch = (regs->tregs[4]) >> 32;
cl = (regs->tregs[4]) & 0xffffffff;
printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
ah = (regs->tregs[5]) >> 32;
al = (regs->tregs[5]) & 0xffffffff;
bh = (regs->tregs[6]) >> 32;
bl = (regs->tregs[6]) & 0xffffffff;
ch = (regs->tregs[7]) >> 32;
cl = (regs->tregs[7]) & 0xffffffff;
printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
ah, al, bh, bl, ch, cl);
/*
* If we're in kernel mode, dump the stack too..
*/
if (!user_mode(regs)) {
void show_stack(struct task_struct *tsk, unsigned long *sp);
unsigned long sp = regs->regs[15] & 0xffffffff;
struct task_struct *tsk = get_current();
tsk->thread.kregs = regs;
show_stack(tsk, (unsigned long *)sp);
}
}
/*
* Free current thread data structures etc..
*/
void exit_thread(void)
{
/*
* See arch/sparc/kernel/process.c for the precedent for doing
* this -- RPC.
*
* The SH-5 FPU save/restore approach relies on
* last_task_used_math pointing to a live task_struct. When
* another task tries to use the FPU for the 1st time, the FPUDIS
* trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
* existing FPU state to the FP regs field within
* last_task_used_math before re-loading the new task's FPU state
* (or initialising it if the FPU has been used before). So if
* last_task_used_math is stale, and its page has already been
* re-allocated for another use, the consequences are rather
* grim. Unless we null it here, there is no other path through
* which it would get safely nulled.
*/
#ifdef CONFIG_SH_FPU
if (last_task_used_math == current) {
last_task_used_math = NULL;
}
#endif
}
void flush_thread(void)
{
/* Called by fs/exec.c (setup_new_exec) to remove traces of a
* previously running executable. */
#ifdef CONFIG_SH_FPU
if (last_task_used_math == current) {
last_task_used_math = NULL;
}
/* Force FPU state to be reinitialised after exec */
clear_used_math();
#endif
/* if we are a kernel thread, about to change to user thread,
* update kreg
*/
if(current->thread.kregs==&fake_swapper_regs) {
current->thread.kregs =
((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
current->thread.uregs = current->thread.kregs;
}
}
void release_thread(struct task_struct *dead_task)
{
/* do nothing */
}
/* Fill in the fpu structure for a core dump.. */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
#ifdef CONFIG_SH_FPU
int fpvalid;
struct task_struct *tsk = current;
fpvalid = !!tsk_used_math(tsk);
if (fpvalid) {
if (current == last_task_used_math) {
enable_fpu();
save_fpu(tsk);
disable_fpu();
last_task_used_math = 0;
regs->sr |= SR_FD;
}
memcpy(fpu, &tsk->thread.xstate->hardfpu, sizeof(*fpu));
}
return fpvalid;
#else
return 0; /* Task didn't use the fpu at all. */
#endif
}
EXPORT_SYMBOL(dump_fpu);
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg, struct task_struct *p)
{
struct pt_regs *childregs, *regs = current_pt_regs();
#ifdef CONFIG_SH_FPU
/* can't happen for a kernel thread */
if (last_task_used_math == current) {
enable_fpu();
save_fpu(current);
disable_fpu();
last_task_used_math = NULL;
current_pt_regs()->sr |= SR_FD;
}
#endif
/* Copy from sh version */
childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
p->thread.sp = (unsigned long) childregs;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
childregs->regs[2] = (unsigned long)arg;
childregs->regs[3] = (unsigned long)fn;
childregs->sr = (1 << 30); /* not user_mode */
childregs->sr |= SR_FD; /* Invalidate FPU flag */
p->thread.pc = (unsigned long) ret_from_kernel_thread;
return 0;
}
*childregs = *current_pt_regs();
/*
* Sign extend the edited stack.
* Note that thread.pc and thread.pc will stay
* 32-bit wide and context switch must take care
* of NEFF sign extension.
*/
if (usp)
childregs->regs[15] = neff_sign_extend(usp);
p->thread.uregs = childregs;
childregs->regs[9] = 0; /* Set return value for child */
childregs->sr |= SR_FD; /* Invalidate FPU flag */
p->thread.pc = (unsigned long) ret_from_fork;
return 0;
}
#ifdef CONFIG_FRAME_POINTER
static int in_sh64_switch_to(unsigned long pc)
{
extern char __sh64_switch_to_end;
/* For a sleeping task, the PC is somewhere in the middle of the function,
so we don't have to worry about masking the LSB off */
return (pc >= (unsigned long) sh64_switch_to) &&
(pc < (unsigned long) &__sh64_switch_to_end);
}
#endif
unsigned long get_wchan(struct task_struct *p)
{
unsigned long pc;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
/*
* The same comment as on the Alpha applies here, too ...
*/
pc = thread_saved_pc(p);
#ifdef CONFIG_FRAME_POINTER
if (in_sh64_switch_to(pc)) {
unsigned long schedule_fp;
unsigned long sh64_switch_to_fp;
unsigned long schedule_caller_pc;
sh64_switch_to_fp = (long) p->thread.sp;
/* r14 is saved at offset 4 in the sh64_switch_to frame */
schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
/* and the caller of 'schedule' is (currently!) saved at offset 24
in the frame of schedule (from disasm) */
schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
return schedule_caller_pc;
}
#endif
return pc;
}