unsigned long get_wchan(struct task_struct *p)
{
unsigned long schedule_frame;
unsigned long pc;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
pc = thread_saved_pc(&p->thread);
if (pc == (unsigned long) interruptible_sleep_on
|| pc == (unsigned long) sleep_on) {
schedule_frame = ((unsigned long *)p->thread.reg30)[9];
return ((unsigned long *)schedule_frame)[15];
}
if (pc == (unsigned long) interruptible_sleep_on_timeout
|| pc == (unsigned long) sleep_on_timeout) {
schedule_frame = ((unsigned long *)p->thread.reg30)[9];
return ((unsigned long *)schedule_frame)[16];
}
if (pc >= first_sched && pc < last_sched) {
printk(KERN_DEBUG "Bug in %s\n", __FUNCTION__);
}
return pc;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
#ifdef CONFIG_SMP
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0;
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)save_stack_trace_tsk;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.pc = thread_saved_pc(tsk);
} else {
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
frame.pc = (unsigned long)save_stack_trace_tsk;
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = tsk->curr_ret_stack;
#endif
walk_stackframe(tsk, &frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
/*
* get_wchan - a maintenance nightmare^W^Wpain in the ass ...
*/
unsigned long get_wchan(struct task_struct *task)
{
unsigned long pc = 0;
#ifdef CONFIG_KALLSYMS
unsigned long sp;
unsigned long ra = 0;
#endif
if (!task || task == current || task->state == TASK_RUNNING)
goto out;
if (!task_stack_page(task))
goto out;
pc = thread_saved_pc(task);
#ifdef CONFIG_KALLSYMS
sp = task->thread.reg29 + schedule_mfi.frame_size;
while (in_sched_functions(pc))
pc = unwind_stack(task, &sp, pc, &ra);
#endif
out:
return pc;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
#ifdef CONFIG_SMP
/* 20110630, [email protected], Merge Black DCM, Power Management. [UB_START] */
#if 1
/*
* What guarantees do we have here that 'tsk' is not
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else // old
/* 20110630, [email protected], Merge Black DCM, Power Management. [UB_END] */
/*
* What guarantees do we have here that 'tsk' is not
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
BUG();
/* 20110630, [email protected], Merge Black DCM, Power Management. [UB_START] */
#endif
/* 20110630, [email protected], Merge Black DCM, Power Management. [UB_END] */
#else
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0; /* recovered from the stack */
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)save_stack_trace_tsk;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
static struct pt_regs * unwind_get_regs(struct task_struct *tsk)
{
struct stackframe frame;
register unsigned long current_sp asm ("sp");
int found = 0;
//unsigned long sc;
if (!tsk)
tsk = current;
printk("tsk = %p,comm=%s,pid=%d,pgd=0x%p\n", tsk , tsk->comm , tsk->pid , tsk->mm->pgd );
if (tsk == current) {
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)unwind_get_regs;
} else {
/* task blocked in __switch_to */
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
/*
* The function calling __switch_to cannot be a leaf function
* so LR is recovered from the stack.
*/
frame.lr = 0;
frame.pc = thread_saved_pc(tsk);
}
while (1) {
int urc;
//unsigned long where = frame.pc;
urc = unwind_frame(&frame);
if (urc < 0)
break;
//dump_backtrace_entry(where, frame.pc, frame.sp - 4);
if( frame.pc == (unsigned long)ret_fast_syscall ){
found = 1;
break;
}
}
if( !found )
return NULL;
#if 0
//printk("FRAME:sp=0x%lx,pc=0x%lx,lr=0x%lx,fp=0x%lx\n" , frame.sp,frame.pc,frame.lr,frame.fp );
//rk28_printk_mem((unsigned int*)(frame.sp-sizeof(struct pt_regs)),2*sizeof(struct pt_regs)/4+8, NULL );
sc =*( (unsigned long*)(frame.sp-4));
if( sc >= (unsigned long)&_text && sc < (unsigned long)&_end ){
print_symbol("sys call=%s\n",sc );
}
#endif
return (struct pt_regs *)(frame.sp+8); // 8 for reg r4,r5 as fifth and sixth args.
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
/* CORE-HC-ANR_Kernel_Stack-00*[ */
/*#ifdef CONFIG_SMP*/
#if defined(CONFIG_SMP) && !defined(CONFIG_FIH_DUMP_KERNEL_STACK)
/*
* What guarantees do we have here that 'tsk' is not
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
pr_info("save_stack_trace_tsk: %s[%d] %s[%d]\r\n",
current->comm,
smp_processor_id(),
tsk->comm,
task_thread_info(tsk)->cpu);
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0; /* recovered from the stack */
frame.pc = thread_saved_pc(tsk);
#endif
/* CORE-HC-ANR_Kernel_Stack-00*] */
} else {
register unsigned long current_sp asm ("sp");
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)save_stack_trace_tsk;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
static unsigned long get_wchan(struct task_struct *p)
{
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
#if defined(__i386__)
{
unsigned long ebp, eip;
unsigned long stack_page;
int count = 0;
stack_page = p->kernel_stack_page;
if (!stack_page)
return 0;
ebp = p->tss.ebp;
do {
if (ebp < stack_page || ebp >= 4092+stack_page)
return 0;
eip = *(unsigned long *) (ebp+4);
if ((void *)eip != sleep_on &&
(void *)eip != interruptible_sleep_on)
return eip;
ebp = *(unsigned long *) ebp;
} while (count++ < 16);
}
#elif defined(__alpha__)
/*
* This one depends on the frame size of schedule(). Do a
* "disass schedule" in gdb to find the frame size. Also, the
* code assumes that sleep_on() follows immediately after
* interruptible_sleep_on() and that add_timer() follows
* immediately after interruptible_sleep(). Ugly, isn't it?
* Maybe adding a wchan field to task_struct would be better,
* after all...
*/
{
unsigned long schedule_frame;
unsigned long pc;
pc = thread_saved_pc(&p->tss);
if (pc >= (unsigned long) interruptible_sleep_on && pc < (unsigned long) add_timer) {
schedule_frame = ((unsigned long *)p->tss.ksp)[6];
return ((unsigned long *)schedule_frame)[12];
}
return pc;
}
#endif
return 0;
}
void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
struct stackframe frame;
int skip;
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
if (!tsk)
tsk = current;
if (!try_get_task_stack(tsk))
return;
if (tsk == current) {
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.pc = (unsigned long)dump_backtrace;
} else {
/*
* task blocked in __switch_to
*/
frame.fp = thread_saved_fp(tsk);
frame.pc = thread_saved_pc(tsk);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = 0;
#endif
skip = !!regs;
printk("Call trace:\n");
do {
/* skip until specified stack frame */
if (!skip) {
dump_backtrace_entry(frame.pc);
} else if (frame.fp == regs->regs[29]) {
skip = 0;
/*
* Mostly, this is the case where this function is
* called in panic/abort. As exception handler's
* stack frame does not contain the corresponding pc
* at which an exception has taken place, use regs->pc
* instead.
*/
dump_backtrace_entry(regs->pc);
}
} while (!unwind_frame(tsk, &frame));
put_task_stack(tsk);
}
/* get_wchan - a maintenance nightmare ... */
unsigned long get_wchan(struct task_struct *p)
{
unsigned long frame, pc;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
pc = thread_saved_pc(&p->thread);
if (pc < first_sched || pc >= last_sched)
goto out;
if (pc >= (unsigned long) sleep_on_timeout)
goto schedule_timeout_caller;
if (pc >= (unsigned long) sleep_on)
goto schedule_caller;
if (pc >= (unsigned long) interruptible_sleep_on_timeout)
goto schedule_timeout_caller;
if (pc >= (unsigned long)interruptible_sleep_on)
goto schedule_caller;
goto schedule_timeout_caller;
schedule_caller:
frame = ((unsigned long *)p->thread.reg30)[10];
pc = ((unsigned long *)frame)[7];
goto out;
schedule_timeout_caller:
/* Must be schedule_timeout ... */
pc = ((unsigned long *)p->thread.reg30)[11];
frame = ((unsigned long *)p->thread.reg30)[10];
/* The schedule_timeout frame ... */
pc = ((unsigned long *)frame)[9];
frame = ((unsigned long *)frame)[8];
if (pc >= first_sched && pc < last_sched) {
/* schedule_timeout called by interruptible_sleep_on_timeout */
pc = ((unsigned long *)frame)[7];
frame = ((unsigned long *)frame)[6];
}
out:
if (current->thread.mflags & MF_32BIT) /* Kludge for 32-bit ps */
pc &= 0xffffffff;
return pc;
}
/* get_wchan - a maintenance nightmare^W^Wpain in the ass ... */
unsigned long get_wchan(struct task_struct *p)
{
unsigned long stack_page;
unsigned long pc;
#ifdef CONFIG_KALLSYMS
unsigned long frame;
#endif
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = (unsigned long)task_stack_page(p);
if (!stack_page || !mfinfo_num)
return 0;
pc = thread_saved_pc(p);
#ifdef CONFIG_KALLSYMS
if (!in_sched_functions(pc))
return pc;
frame = p->thread.reg29 + schedule_frame->frame_size;
do {
int i;
if (frame < stack_page || frame > stack_page + THREAD_SIZE - 32)
return 0;
for (i = mfinfo_num - 1; i >= 0; i--) {
if (pc >= (unsigned long) mfinfo[i].func)
break;
}
if (i < 0)
break;
if (mfinfo[i].pc_offset < 0)
break;
pc = ((unsigned long *)frame)[mfinfo[i].pc_offset];
if (!mfinfo[i].frame_size)
break;
frame += mfinfo[i].frame_size;
} while (in_sched_functions(pc));
#endif
return pc;
}
/* This must be noinline to so that our skip calculation works correctly */
static noinline void __save_stack_trace(struct task_struct *tsk,
struct stack_trace *trace, unsigned int nosched)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
data.no_sched_functions = nosched;
if (tsk != current) {
/* Bright Lee, 20130322, enable stack trace when android hang in debug stage { */
// #ifdef CONFIG_SMP
#if 0
/* } Bright Lee, 20130322 */
/*
* What guarantees do we have here that 'tsk' is not
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0; /* recovered from the stack */
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
/* We don't want this function nor the caller */
data.skip += 2;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)__save_stack_trace;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
/* enable call stack in smp arch */
#if defined(CONFIG_SMP) && !defined(CONFIG_HUAWEI_KERNEL)
/*
* What guarantees do we have here that 'tsk' is not
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0; /* recovered from the stack */
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)save_stack_trace_tsk;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void aee_dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
struct stackframe frame;
const register unsigned long current_sp asm("sp");
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
if (!tsk)
tsk = current;
if (regs) {
frame.fp = regs->regs[29];
frame.sp = regs->sp;
frame.pc = regs->pc;
} else if (tsk == current) {
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.pc = (unsigned long)aee_dump_backtrace;
} else {
/*
* task blocked in __switch_to
*/
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.pc = thread_saved_pc(tsk);
}
aee_sram_fiq_log("Call trace:\n");
while (1) {
unsigned long where = frame.pc;
int ret;
ret = unwind_frame(&frame);
if (ret < 0)
break;
dump_backtrace_entry(where, frame.sp);
}
}
/* get_wchan - a maintenance nightmare^W^Wpain in the ass ... */
unsigned long get_wchan(struct task_struct *p)
{
unsigned long stack_page;
unsigned long frame, pc;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = (unsigned long)p->thread_info;
if (!stack_page || !mips_frame_info_initialized)
return 0;
pc = thread_saved_pc(p);
if (!in_sched_functions(pc))
return pc;
frame = ((unsigned long *)p->thread.reg30)[schedule_frame.frame_offset];
do {
int i;
if (frame < stack_page || frame > stack_page + THREAD_SIZE - 32)
return 0;
for (i = ARRAY_SIZE(mfinfo) - 1; i >= 0; i--) {
if (pc >= (unsigned long) mfinfo[i].func)
break;
}
if (i < 0)
break;
if (mfinfo[i].omit_fp)
break;
pc = ((unsigned long *)frame)[mfinfo[i].pc_offset];
frame = ((unsigned long *)frame)[mfinfo[i].frame_offset];
} while (in_sched_functions(pc));
return pc;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
if (tsk != current) {
#ifdef CONFIG_SMP
/*
* What guarantees do we have here that 'tsk'
* is not running on another CPU?
*/
/* 20101006 [email protected] temporary block because of reset */
/* BUG(); */
return;
#else
data.no_sched_functions = 1;
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0; /* recovered from the stack */
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
data.no_sched_functions = 0;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)save_stack_trace_tsk;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
/* This must be noinline to so that our skip calculation works correctly */
static noinline void __save_stack_trace(struct task_struct *tsk,
struct stack_trace *trace, unsigned int nosched)
{
struct stack_trace_data data;
struct stackframe frame;
data.trace = trace;
data.skip = trace->skip;
data.no_sched_functions = nosched;
if (tsk != current) {
#ifdef CONFIG_SMP
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.lr = 0;
frame.pc = thread_saved_pc(tsk);
#endif
} else {
register unsigned long current_sp asm ("sp");
/* We don't want this function nor the caller */
data.skip += 2;
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_sp;
frame.lr = (unsigned long)__builtin_return_address(0);
frame.pc = (unsigned long)__save_stack_trace;
}
walk_stackframe(&frame, save_trace, &data);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
unsigned long
get_wchan(struct task_struct *p)
{
unsigned long schedule_frame;
unsigned long pc;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
/*
* This one depends on the frame size of schedule(). Do a
* "disass schedule" in gdb to find the frame size. Also, the
* code assumes that sleep_on() follows immediately after
* interruptible_sleep_on() and that add_timer() follows
* immediately after interruptible_sleep(). Ugly, isn't it?
* Maybe adding a wchan field to task_struct would be better,
* after all...
*/
pc = thread_saved_pc(p);
if (in_sched_functions(pc)) {
schedule_frame = ((unsigned long *)task_thread_info(p)->pcb.ksp)[6];
return ((unsigned long *)schedule_frame)[12];
}
return pc;
}
static unsigned long get_wchan(struct task_struct *p)
{
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
#if defined(__i386__)
{
unsigned long ebp, esp, eip;
unsigned long stack_page;
int count = 0;
stack_page = (unsigned long)p;
esp = p->tss.esp;
if (!stack_page || esp < stack_page || esp >= 8188+stack_page)
return 0;
/* include/asm-i386/system.h:switch_to() pushes ebp last. */
ebp = *(unsigned long *) esp;
do {
if (ebp < stack_page || ebp >= 8188+stack_page)
return 0;
eip = *(unsigned long *) (ebp+4);
if (eip < first_sched || eip >= last_sched)
return eip;
ebp = *(unsigned long *) ebp;
} while (count++ < 16);
}
#elif defined(__alpha__)
/*
* This one depends on the frame size of schedule(). Do a
* "disass schedule" in gdb to find the frame size. Also, the
* code assumes that sleep_on() follows immediately after
* interruptible_sleep_on() and that add_timer() follows
* immediately after interruptible_sleep(). Ugly, isn't it?
* Maybe adding a wchan field to task_struct would be better,
* after all...
*/
{
unsigned long schedule_frame;
unsigned long pc;
pc = thread_saved_pc(&p->tss);
if (pc >= first_sched && pc < last_sched) {
schedule_frame = ((unsigned long *)p->tss.ksp)[6];
return ((unsigned long *)schedule_frame)[12];
}
return pc;
}
#elif defined(__mips__)
/*
* The same comment as on the Alpha applies here, too ...
*/
{
unsigned long schedule_frame;
unsigned long pc;
pc = thread_saved_pc(&p->tss);
if (pc >= (unsigned long) interruptible_sleep_on && pc < (unsigned long) add_timer) {
schedule_frame = ((unsigned long *)(long)p->tss.reg30)[16];
return (unsigned long)((unsigned long *)schedule_frame)[11];
}
return pc;
}
#elif defined(__mc68000__)
{
unsigned long fp, pc;
unsigned long stack_page;
int count = 0;
stack_page = (unsigned long)p;
fp = ((struct switch_stack *)p->tss.ksp)->a6;
do {
if (fp < stack_page+sizeof(struct task_struct) ||
fp >= 8184+stack_page)
return 0;
pc = ((unsigned long *)fp)[1];
/* FIXME: This depends on the order of these functions. */
if (pc < first_sched || pc >= last_sched)
return pc;
fp = *(unsigned long *) fp;
} while (count++ < 16);
}
#elif defined(__powerpc__)
{
unsigned long ip, sp;
unsigned long stack_page = (unsigned long) p;
int count = 0;
sp = p->tss.ksp;
do {
sp = *(unsigned long *)sp;
if (sp < stack_page || sp >= stack_page + 8188)
return 0;
if (count > 0) {
ip = *(unsigned long *)(sp + 4);
if (ip < first_sched || ip >= last_sched)
return ip;
}
} while (count++ < 16);
}
#elif defined(__arm__)
{
unsigned long fp, lr;
unsigned long stack_page;
int count = 0;
stack_page = 4096 + (unsigned long)p;
fp = get_css_fp (&p->tss);
do {
if (fp < stack_page || fp > 4092+stack_page)
return 0;
lr = pc_pointer (((unsigned long *)fp)[-1]);
if (lr < first_sched || lr > last_sched)
return lr;
fp = *(unsigned long *) (fp - 12);
} while (count ++ < 16);
}
#elif defined (__sparc__)
{
unsigned long pc, fp, bias = 0;
unsigned long task_base = (unsigned long) p;
struct reg_window *rw;
int count = 0;
#ifdef __sparc_v9__
bias = STACK_BIAS;
#endif
fp = p->tss.ksp + bias;
do {
/* Bogus frame pointer? */
if (fp < (task_base + sizeof(struct task_struct)) ||
fp >= (task_base + (2 * PAGE_SIZE)))
break;
rw = (struct reg_window *) fp;
pc = rw->ins[7];
if (pc < first_sched || pc >= last_sched)
return pc;
fp = rw->ins[6] + bias;
} while (++count < 16);
}
#elif defined (__s390__)
{
unsigned long ksp, backchain, ip;
unsigned long stack_page;
int count = 0;
stack_page = (unsigned long)p;
ksp = p->tss.ksp;
if (!stack_page || ksp < stack_page || ksp >= 8188+stack_page)
return 0;
backchain = (*(unsigned long *) ksp) & 0x7fffffff;
do {
if (backchain < stack_page || backchain >= 8188+stack_page)
return 0;
ip = (*(unsigned long *) (backchain+56)) & 0x7fffffff;
if (ip < first_sched || ip >= last_sched)
return ip;
backchain = (*(unsigned long *) backchain) & 0x7fffffff;
} while (count++ < 16);
}
#endif
return 0;
}
void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
{
struct stackframe frame;
unsigned long irq_stack_ptr;
int skip;
pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
if (!tsk)
tsk = current;
if (!try_get_task_stack(tsk))
return;
/*
* Switching between stacks is valid when tracing current and in
* non-preemptible context.
*/
if (tsk == current && !preemptible())
irq_stack_ptr = IRQ_STACK_PTR(smp_processor_id());
else
irq_stack_ptr = 0;
if (tsk == current) {
frame.fp = (unsigned long)__builtin_frame_address(0);
frame.sp = current_stack_pointer;
frame.pc = (unsigned long)dump_backtrace;
} else {
/*
* task blocked in __switch_to
*/
frame.fp = thread_saved_fp(tsk);
frame.sp = thread_saved_sp(tsk);
frame.pc = thread_saved_pc(tsk);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
frame.graph = tsk->curr_ret_stack;
#endif
skip = !!regs;
printk("Call trace:\n");
while (1) {
unsigned long where = frame.pc;
unsigned long stack;
int ret;
/* skip until specified stack frame */
if (!skip) {
dump_backtrace_entry(where);
} else if (frame.fp == regs->regs[29]) {
skip = 0;
/*
* Mostly, this is the case where this function is
* called in panic/abort. As exception handler's
* stack frame does not contain the corresponding pc
* at which an exception has taken place, use regs->pc
* instead.
*/
dump_backtrace_entry(regs->pc);
}
ret = unwind_frame(tsk, &frame);
if (ret < 0)
break;
stack = frame.sp;
if (in_exception_text(where)) {
/*
* If we switched to the irq_stack before calling this
* exception handler, then the pt_regs will be on the
* task stack. The easiest way to tell is if the large
* pt_regs would overlap with the end of the irq_stack.
*/
if (stack < irq_stack_ptr &&
(stack + sizeof(struct pt_regs)) > irq_stack_ptr)
stack = IRQ_STACK_TO_TASK_STACK(irq_stack_ptr);
dump_mem("", "Exception stack", stack,
stack + sizeof(struct pt_regs));
}
}
put_task_stack(tsk);
}