/* * Copyright (C) 2004-2006 Atmel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */#include <linux/sched.h>#include <linux/module.h>#include <linux/kallsyms.h>#include <linux/fs.h>#include <linux/pm.h>#include <linux/ptrace.h>#include <linux/slab.h>#include <linux/reboot.h>#include <linux/tick.h>#include <linux/uaccess.h>#include <linux/unistd.h> #include <asm/sysreg.h>#include <asm/ocd.h>#include <asm/syscalls.h> #include <mach/pm.h> void (*pm_power_off)(void);EXPORT_SYMBOL(pm_power_off); /* * This file handles the architecture-dependent parts of process handling.. */ void arch_cpu_idle(void){ cpu_enter_idle();} void machine_halt(void){ /* * Enter Stop mode. The 32 kHz oscillator will keep running so * the RTC will keep the time properly and the system will * boot quickly. */ asm volatile("sleep 3\n\t" "sub pc, -2");} void machine_power_off(void){ if (pm_power_off) pm_power_off();} void machine_restart(char *cmd){ ocd_write(DC, (1 << OCD_DC_DBE_BIT)); ocd_write(DC, (1 << OCD_DC_RES_BIT)); while (1) ;} /* * Free current thread data structures etc */void exit_thread(void){ ocd_disable(current);} void flush_thread(void){ /* nothing to do */} void release_thread(struct task_struct *dead_task){ /* do nothing */} static void dump_mem(const char *str, const char *log_lvl, unsigned long bottom, unsigned long top){ unsigned long p; int i; printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top); for (p = bottom & ~31; p < top; ) { printk("%s%04lx: ", log_lvl, p & 0xffff); for (i = 0; i < 8; i++, p += 4) { unsigned int val; if (p < bottom || p >= top) printk(" "); else { if (__get_user(val, (unsigned int __user *)p)) { printk("\n"); goto out; } printk("%08x ", val); } } printk("\n"); } out: return;} static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p){ return (p > (unsigned long)tinfo) && (p < (unsigned long)tinfo + THREAD_SIZE - 3);} #ifdef CONFIG_FRAME_POINTERstatic void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp, struct pt_regs *regs, const char *log_lvl){ unsigned long lr, fp; struct thread_info *tinfo; if (regs) fp = regs->r7; else if (tsk == current) asm("mov %0, r7" : "=r"(fp)); else fp = tsk->thread.cpu_context.r7; /* * Walk the stack as long as the frame pointer (a) is within * the kernel stack of the task, and (b) it doesn't move * downwards. */ tinfo = task_thread_info(tsk); printk("%sCall trace:\n", log_lvl); while (valid_stack_ptr(tinfo, fp)) { unsigned long new_fp; lr = *(unsigned long *)fp;#ifdef CONFIG_KALLSYMS printk("%s [<%08lx>] ", log_lvl, lr);#else printk(" [<%08lx>] ", lr);#endif print_symbol("%s\n", lr); new_fp = *(unsigned long *)(fp + 4); if (new_fp <= fp) break; fp = new_fp; } printk("\n");}#elsestatic void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp, struct pt_regs *regs, const char *log_lvl){ unsigned long addr; printk("%sCall trace:\n", log_lvl); while (!kstack_end(sp)) { addr = *sp++; if (kernel_text_address(addr)) {#ifdef CONFIG_KALLSYMS printk("%s [<%08lx>] ", log_lvl, addr);#else printk(" [<%08lx>] ", addr);#endif print_symbol("%s\n", addr); } } printk("\n");}#endif void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp, struct pt_regs *regs, const char *log_lvl){ struct thread_info *tinfo; if (sp == 0) { if (tsk) sp = tsk->thread.cpu_context.ksp; else sp = (unsigned long)&tinfo; } if (!tsk) tsk = current; tinfo = task_thread_info(tsk); if (valid_stack_ptr(tinfo, sp)) { dump_mem("Stack: ", log_lvl, sp, THREAD_SIZE + (unsigned long)tinfo); show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl); }} void show_stack(struct task_struct *tsk, unsigned long *stack){ show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");} static const char *cpu_modes[] = { "Application", "Supervisor", "Interrupt level 0", "Interrupt level 1", "Interrupt level 2", "Interrupt level 3", "Exception", "NMI"}; void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl){ unsigned long sp = regs->sp; unsigned long lr = regs->lr; unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT; show_regs_print_info(log_lvl); if (!user_mode(regs)) { sp = (unsigned long)regs + FRAME_SIZE_FULL; printk("%s", log_lvl); print_symbol("PC is at %s\n", instruction_pointer(regs)); printk("%s", log_lvl); print_symbol("LR is at %s\n", lr); } printk("%spc : [<%08lx>] lr : [<%08lx>] %s\n" "%ssp : %08lx r12: %08lx r11: %08lx\n", log_lvl, instruction_pointer(regs), lr, print_tainted(), log_lvl, sp, regs->r12, regs->r11); printk("%sr10: %08lx r9 : %08lx r8 : %08lx\n", log_lvl, regs->r10, regs->r9, regs->r8); printk("%sr7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", log_lvl, regs->r7, regs->r6, regs->r5, regs->r4); printk("%sr3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", log_lvl, regs->r3, regs->r2, regs->r1, regs->r0); printk("%sFlags: %c%c%c%c%c\n", log_lvl, regs->sr & SR_Q ? 'Q' : 'q', regs->sr & SR_V ? 'V' : 'v', regs->sr & SR_N ? 'N' : 'n', regs->sr & SR_Z ? 'Z' : 'z', regs->sr & SR_C ? 'C' : 'c'); printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl, regs->sr & SR_H ? 'H' : 'h', regs->sr & SR_J ? 'J' : 'j', regs->sr & SR_DM ? 'M' : 'm', regs->sr & SR_D ? 'D' : 'd', regs->sr & SR_EM ? 'E' : 'e', regs->sr & SR_I3M ? '3' : '.', regs->sr & SR_I2M ? '2' : '.', regs->sr & SR_I1M ? '1' : '.', regs->sr & SR_I0M ? '0' : '.', regs->sr & SR_GM ? 'G' : 'g'); printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);} void show_regs(struct pt_regs *regs){ unsigned long sp = regs->sp; if (!user_mode(regs)) sp = (unsigned long)regs + FRAME_SIZE_FULL; show_regs_log_lvl(regs, ""); show_trace_log_lvl(current, (unsigned long *)sp, regs, "");}EXPORT_SYMBOL(show_regs); /* Fill in the fpu structure for a core dump. This is easy -- we don't have any */int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu){ /* Not valid */ return 0;} asmlinkage void ret_from_fork(void);asmlinkage void ret_from_kernel_thread(void);asmlinkage void syscall_return(void); int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, struct task_struct *p){ struct pt_regs *childregs = task_pt_regs(p); if (unlikely(p->flags & PF_KTHREAD)) { memset(childregs, 0, sizeof(struct pt_regs)); p->thread.cpu_context.r0 = arg; p->thread.cpu_context.r1 = usp; /* fn */ p->thread.cpu_context.r2 = (unsigned long)syscall_return; p->thread.cpu_context.pc = (unsigned long)ret_from_kernel_thread; childregs->sr = MODE_SUPERVISOR; } else { *childregs = *current_pt_regs(); if (usp) childregs->sp = usp; childregs->r12 = 0; /* Set return value for child */ p->thread.cpu_context.pc = (unsigned long)ret_from_fork; } p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM; p->thread.cpu_context.ksp = (unsigned long)childregs; clear_tsk_thread_flag(p, TIF_DEBUG); if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG)) ocd_enable(p); return 0;} /* * This function is supposed to answer the question "who called * schedule()?" */unsigned long get_wchan(struct task_struct *p){ unsigned long pc; unsigned long stack_page; if (!p || p == current || p->state == TASK_RUNNING) return 0; stack_page = (unsigned long)task_stack_page(p); BUG_ON(!stack_page); /* * The stored value of PC is either the address right after * the call to __switch_to() or ret_from_fork. */ pc = thread_saved_pc(p); if (in_sched_functions(pc)) {#ifdef CONFIG_FRAME_POINTER unsigned long fp = p->thread.cpu_context.r7; BUG_ON(fp < stack_page || fp > (THREAD_SIZE + stack_page)); pc = *(unsigned long *)fp;#else /* * We depend on the frame size of schedule here, which * is actually quite ugly. It might be possible to * determine the frame size automatically at build * time by doing this: * - compile sched/core.c * - disassemble the resulting sched.o * - look for 'sub sp,??' shortly after '<schedule>:' */ unsigned long sp = p->thread.cpu_context.ksp + 16; BUG_ON(sp < stack_page || sp > (THREAD_SIZE + stack_page)); pc = *(unsigned long *)sp;#endif } return pc;}
/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <linux/pm.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/reboot.h>
#include <linux/tick.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
#include <asm/sysreg.h>
#include <asm/ocd.h>
#include <asm/syscalls.h>
#include <mach/pm.h>
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
/*
* This file handles the architecture-dependent parts of process handling..
*/
void arch_cpu_idle(void)
{
cpu_enter_idle();
}
void machine_halt(void)
{
/*
* Enter Stop mode. The 32 kHz oscillator will keep running so
* the RTC will keep the time properly and the system will
* boot quickly.
*/
asm volatile("sleep 3\n\t"
"sub pc, -2");
}
void machine_power_off(void)
{
if (pm_power_off)
pm_power_off();
}
void machine_restart(char *cmd)
{
ocd_write(DC, (1 << OCD_DC_DBE_BIT));
ocd_write(DC, (1 << OCD_DC_RES_BIT));
while (1) ;
}
/*
* Free current thread data structures etc
*/
void exit_thread(void)
{
ocd_disable(current);
}
void flush_thread(void)
{
/* nothing to do */
}
void release_thread(struct task_struct *dead_task)
{
/* do nothing */
}
static void dump_mem(const char *str, const char *log_lvl,
unsigned long bottom, unsigned long top)
{
unsigned long p;
int i;
printk("%s%s(0x%08lx to 0x%08lx)\n", log_lvl, str, bottom, top);
for (p = bottom & ~31; p < top; ) {
printk("%s%04lx: ", log_lvl, p & 0xffff);
for (i = 0; i < 8; i++, p += 4) {
unsigned int val;
if (p < bottom || p >= top)
printk(" ");
else {
if (__get_user(val, (unsigned int __user *)p)) {
printk("\n");
goto out;
}
printk("%08x ", val);
}
}
printk("\n");
}
out:
return;
}
static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
{
return (p > (unsigned long)tinfo)
&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
}
#ifdef CONFIG_FRAME_POINTER
static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs, const char *log_lvl)
{
unsigned long lr, fp;
struct thread_info *tinfo;
if (regs)
fp = regs->r7;
else if (tsk == current)
asm("mov %0, r7" : "=r"(fp));
else
fp = tsk->thread.cpu_context.r7;
/*
* Walk the stack as long as the frame pointer (a) is within
* the kernel stack of the task, and (b) it doesn't move
* downwards.
*/
tinfo = task_thread_info(tsk);
printk("%sCall trace:\n", log_lvl);
while (valid_stack_ptr(tinfo, fp)) {
unsigned long new_fp;
lr = *(unsigned long *)fp;
#ifdef CONFIG_KALLSYMS
printk("%s [<%08lx>] ", log_lvl, lr);
#else
printk(" [<%08lx>] ", lr);
#endif
print_symbol("%s\n", lr);
new_fp = *(unsigned long *)(fp + 4);
if (new_fp <= fp)
break;
fp = new_fp;
}
printk("\n");
}
#else
static void show_trace_log_lvl(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs, const char *log_lvl)
{
unsigned long addr;
printk("%sCall trace:\n", log_lvl);
while (!kstack_end(sp)) {
addr = *sp++;
if (kernel_text_address(addr)) {
#ifdef CONFIG_KALLSYMS
printk("%s [<%08lx>] ", log_lvl, addr);
#else
printk(" [<%08lx>] ", addr);
#endif
print_symbol("%s\n", addr);
}
}
printk("\n");
}
#endif
void show_stack_log_lvl(struct task_struct *tsk, unsigned long sp,
struct pt_regs *regs, const char *log_lvl)
{
struct thread_info *tinfo;
if (sp == 0) {
if (tsk)
sp = tsk->thread.cpu_context.ksp;
else
sp = (unsigned long)&tinfo;
}
if (!tsk)
tsk = current;
tinfo = task_thread_info(tsk);
if (valid_stack_ptr(tinfo, sp)) {
dump_mem("Stack: ", log_lvl, sp,
THREAD_SIZE + (unsigned long)tinfo);
show_trace_log_lvl(tsk, (unsigned long *)sp, regs, log_lvl);
}
}
void show_stack(struct task_struct *tsk, unsigned long *stack)
{
show_stack_log_lvl(tsk, (unsigned long)stack, NULL, "");
}
static const char *cpu_modes[] = {
"Application", "Supervisor", "Interrupt level 0", "Interrupt level 1",
"Interrupt level 2", "Interrupt level 3", "Exception", "NMI"
};
void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl)
{
unsigned long sp = regs->sp;
unsigned long lr = regs->lr;
unsigned long mode = (regs->sr & MODE_MASK) >> MODE_SHIFT;
show_regs_print_info(log_lvl);
if (!user_mode(regs)) {
sp = (unsigned long)regs + FRAME_SIZE_FULL;
printk("%s", log_lvl);
print_symbol("PC is at %s\n", instruction_pointer(regs));
printk("%s", log_lvl);
print_symbol("LR is at %s\n", lr);
}
printk("%spc : [<%08lx>] lr : [<%08lx>] %s\n"
"%ssp : %08lx r12: %08lx r11: %08lx\n",
log_lvl, instruction_pointer(regs), lr, print_tainted(),
log_lvl, sp, regs->r12, regs->r11);
printk("%sr10: %08lx r9 : %08lx r8 : %08lx\n",
log_lvl, regs->r10, regs->r9, regs->r8);
printk("%sr7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
log_lvl, regs->r7, regs->r6, regs->r5, regs->r4);
printk("%sr3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
log_lvl, regs->r3, regs->r2, regs->r1, regs->r0);
printk("%sFlags: %c%c%c%c%c\n", log_lvl,
regs->sr & SR_Q ? 'Q' : 'q',
regs->sr & SR_V ? 'V' : 'v',
regs->sr & SR_N ? 'N' : 'n',
regs->sr & SR_Z ? 'Z' : 'z',
regs->sr & SR_C ? 'C' : 'c');
printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl,
regs->sr & SR_H ? 'H' : 'h',
regs->sr & SR_J ? 'J' : 'j',
regs->sr & SR_DM ? 'M' : 'm',
regs->sr & SR_D ? 'D' : 'd',
regs->sr & SR_EM ? 'E' : 'e',
regs->sr & SR_I3M ? '3' : '.',
regs->sr & SR_I2M ? '2' : '.',
regs->sr & SR_I1M ? '1' : '.',
regs->sr & SR_I0M ? '0' : '.',
regs->sr & SR_GM ? 'G' : 'g');
printk("%sCPU Mode: %s\n", log_lvl, cpu_modes[mode]);
}
void show_regs(struct pt_regs *regs)
{
unsigned long sp = regs->sp;
if (!user_mode(regs))
sp = (unsigned long)regs + FRAME_SIZE_FULL;
show_regs_log_lvl(regs, "");
show_trace_log_lvl(current, (unsigned long *)sp, regs, "");
}
EXPORT_SYMBOL(show_regs);
/* Fill in the fpu structure for a core dump. This is easy -- we don't have any */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
/* Not valid */
return 0;
}
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
asmlinkage void syscall_return(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
struct task_struct *p)
{
struct pt_regs *childregs = task_pt_regs(p);
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
p->thread.cpu_context.r0 = arg;
p->thread.cpu_context.r1 = usp; /* fn */
p->thread.cpu_context.r2 = (unsigned long)syscall_return;
p->thread.cpu_context.pc = (unsigned long)ret_from_kernel_thread;
childregs->sr = MODE_SUPERVISOR;
} else {
*childregs = *current_pt_regs();
if (usp)
childregs->sp = usp;
childregs->r12 = 0; /* Set return value for child */
p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
}
p->thread.cpu_context.sr = MODE_SUPERVISOR | SR_GM;
p->thread.cpu_context.ksp = (unsigned long)childregs;
clear_tsk_thread_flag(p, TIF_DEBUG);
if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
ocd_enable(p);
return 0;
}
/*
* This function is supposed to answer the question "who called
* schedule()?"
*/
unsigned long get_wchan(struct task_struct *p)
{
unsigned long pc;
unsigned long stack_page;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = (unsigned long)task_stack_page(p);
BUG_ON(!stack_page);
/*
* The stored value of PC is either the address right after
* the call to __switch_to() or ret_from_fork.
*/
pc = thread_saved_pc(p);
if (in_sched_functions(pc)) {
#ifdef CONFIG_FRAME_POINTER
unsigned long fp = p->thread.cpu_context.r7;
BUG_ON(fp < stack_page || fp > (THREAD_SIZE + stack_page));
pc = *(unsigned long *)fp;
#else
/*
* We depend on the frame size of schedule here, which
* is actually quite ugly. It might be possible to
* determine the frame size automatically at build
* time by doing this:
* - compile sched/core.c
* - disassemble the resulting sched.o
* - look for 'sub sp,??' shortly after '<schedule>:'
*/
unsigned long sp = p->thread.cpu_context.ksp + 16;
BUG_ON(sp < stack_page || sp > (THREAD_SIZE + stack_page));
pc = *(unsigned long *)sp;
#endif
}
return pc;
}