/* * linux/arch/arm/kernel/process.c * * Copyright (C) 1996-2000 Russell King - Converted to ARM. * Original Copyright (C) 1995 Linus Torvalds * * 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 <stdarg.h> #include <linux/export.h>#include <linux/sched.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/stddef.h>#include <linux/unistd.h>#include <linux/user.h>#include <linux/delay.h>#include <linux/reboot.h>#include <linux/interrupt.h>#include <linux/kallsyms.h>#include <linux/init.h>#include <linux/cpu.h>#include <linux/elfcore.h>#include <linux/pm.h>#include <linux/tick.h>#include <linux/utsname.h>#include <linux/uaccess.h>#include <linux/random.h>#include <linux/hw_breakpoint.h>#include <linux/cpuidle.h> #include <asm/cacheflush.h>#include <asm/leds.h>#include <asm/processor.h>#include <asm/system.h>#include <asm/thread_notify.h>#include <asm/stacktrace.h>#include <asm/mach/time.h> #ifdef CONFIG_CC_STACKPROTECTOR#include <linux/stackprotector.h>unsigned long __stack_chk_guard __read_mostly;EXPORT_SYMBOL(__stack_chk_guard);#endif static const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"}; static const char *isa_modes[] = { "ARM" , "Thumb" , "Jazelle", "ThumbEE"}; extern void setup_mm_for_reboot(void); static volatile int hlt_counter; #include <mach/system.h> void disable_hlt(void){ hlt_counter++;} EXPORT_SYMBOL(disable_hlt); void enable_hlt(void){ hlt_counter--;} EXPORT_SYMBOL(enable_hlt); static int __init nohlt_setup(char *__unused){ hlt_counter = 1; return 1;} static int __init hlt_setup(char *__unused){ hlt_counter = 0; return 1;} __setup("nohlt", nohlt_setup);__setup("hlt", hlt_setup); extern void call_with_stack(void (*fn)(void *), void *arg, void *sp);typedef void (*phys_reset_t)(unsigned long); /* * A temporary stack to use for CPU reset. This is static so that we * don't clobber it with the identity mapping. When running with this * stack, any references to the current task *will not work* so you * should really do as little as possible before jumping to your reset * code. */static u64 soft_restart_stack[16]; static void __soft_restart(void *addr){ phys_reset_t phys_reset; /* Take out a flat memory mapping. */ setup_mm_for_reboot(); /* Clean and invalidate caches */ flush_cache_all(); /* Turn off caching */ cpu_proc_fin(); /* Push out any further dirty data, and ensure cache is empty */ flush_cache_all(); /* Switch to the identity mapping. */ phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset); phys_reset((unsigned long)addr); /* Should never get here. */ BUG();} void soft_restart(unsigned long addr){ u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); /* Disable interrupts first */ local_irq_disable(); local_fiq_disable(); /* Disable the L2 if we're the last man standing. */ if (num_online_cpus() == 1) outer_disable(); /* Change to the new stack and continue with the reset. */ call_with_stack(__soft_restart, (void *)addr, (void *)stack); /* Should never get here. */ BUG();} static void null_restart(char mode, const char *cmd){} /* * Function pointers to optional machine specific functions */void (*pm_power_off)(void);EXPORT_SYMBOL(pm_power_off); void (*arm_pm_restart)(char str, const char *cmd) = null_restart;EXPORT_SYMBOL_GPL(arm_pm_restart); static void do_nothing(void *unused){} /* * cpu_idle_wait - Used to ensure that all the CPUs discard old value of * pm_idle and update to new pm_idle value. Required while changing pm_idle * handler on SMP systems. * * Caller must have changed pm_idle to the new value before the call. Old * pm_idle value will not be used by any CPU after the return of this function. */void cpu_idle_wait(void){ smp_mb(); /* kick all the CPUs so that they exit out of pm_idle */ smp_call_function(do_nothing, NULL, 1);}EXPORT_SYMBOL_GPL(cpu_idle_wait); /* * This is our default idle handler. We need to disable * interrupts here to ensure we don't miss a wakeup call. */static void default_idle(void){ if (!need_resched()) arch_idle(); local_irq_enable();} void (*pm_idle)(void) = default_idle;EXPORT_SYMBOL(pm_idle); /* * The idle thread, has rather strange semantics for calling pm_idle, * but this is what x86 does and we need to do the same, so that * things like cpuidle get called in the same way. The only difference * is that we always respect 'hlt_counter' to prevent low power idle. */void cpu_idle(void){ local_fiq_enable(); /* endless idle loop with no priority at all */ while (1) { tick_nohz_idle_enter(); rcu_idle_enter(); leds_event(led_idle_start); while (!need_resched()) {#ifdef CONFIG_HOTPLUG_CPU if (cpu_is_offline(smp_processor_id())) cpu_die();#endif local_irq_disable();#ifdef CONFIG_PL310_ERRATA_769419 wmb();#endif if (hlt_counter) { local_irq_enable(); cpu_relax(); } else { stop_critical_timings(); if (cpuidle_idle_call()) pm_idle(); start_critical_timings(); /* * This will eventually be removed - pm_idle * functions should always return with IRQs * enabled. */ WARN_ON(irqs_disabled()); local_irq_enable(); } } leds_event(led_idle_end); rcu_idle_exit(); tick_nohz_idle_exit(); preempt_enable_no_resched(); schedule(); preempt_disable(); }} static char reboot_mode = 'h'; int __init reboot_setup(char *str){ reboot_mode = str[0]; return 1;} __setup("reboot=", reboot_setup); void machine_shutdown(void){#ifdef CONFIG_SMP smp_send_stop();#endif} void machine_halt(void){ machine_shutdown(); while (1);} void machine_power_off(void){ machine_shutdown(); if (pm_power_off) pm_power_off();} void machine_restart(char *cmd){ machine_shutdown(); arm_pm_restart(reboot_mode, cmd); /* Give a grace period for failure to restart of 1s */ mdelay(1000); /* Whoops - the platform was unable to reboot. Tell the user! */ printk("Reboot failed -- System halted\n"); while (1);} void __show_regs(struct pt_regs *regs){ unsigned long flags; char buf[64]; printk("CPU: %d %s (%s %.*s)\n", raw_smp_processor_id(), print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version); print_symbol("PC is at %s\n", instruction_pointer(regs)); print_symbol("LR is at %s\n", regs->ARM_lr); printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n" "sp : %08lx ip : %08lx fp : %08lx\n", regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); printk("r10: %08lx r9 : %08lx r8 : %08lx\n", regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); flags = regs->ARM_cpsr; buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; buf[4] = '\0'; printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", buf, interrupts_enabled(regs) ? "n" : "ff", fast_interrupts_enabled(regs) ? "n" : "ff", processor_modes[processor_mode(regs)], isa_modes[isa_mode(regs)], get_fs() == get_ds() ? "kernel" : "user");#ifdef CONFIG_CPU_CP15 { unsigned int ctrl; buf[0] = '\0';#ifdef CONFIG_CPU_CP15_MMU { unsigned int transbase, dac; asm("mrc p15, 0, %0, c2, c0\n\t" "mrc p15, 0, %1, c3, c0\n" : "=r" (transbase), "=r" (dac)); snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", transbase, dac); }#endif asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); printk("Control: %08x%s\n", ctrl, buf); }#endif} void show_regs(struct pt_regs * regs){ printk("\n"); printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm); __show_regs(regs); dump_stack();} ATOMIC_NOTIFIER_HEAD(thread_notify_head); EXPORT_SYMBOL_GPL(thread_notify_head); /* * Free current thread data structures etc.. */void exit_thread(void){ thread_notify(THREAD_NOTIFY_EXIT, current_thread_info());} void flush_thread(void){ struct thread_info *thread = current_thread_info(); struct task_struct *tsk = current; flush_ptrace_hw_breakpoint(tsk); memset(thread->used_cp, 0, sizeof(thread->used_cp)); memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); memset(&thread->fpstate, 0, sizeof(union fp_state)); thread_notify(THREAD_NOTIFY_FLUSH, thread);} void release_thread(struct task_struct *dead_task){} asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); intcopy_thread(unsigned long clone_flags, unsigned long stack_start, unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs){ struct thread_info *thread = task_thread_info(p); struct pt_regs *childregs = task_pt_regs(p); *childregs = *regs; childregs->ARM_r0 = 0; childregs->ARM_sp = stack_start; memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); thread->cpu_context.sp = (unsigned long)childregs; thread->cpu_context.pc = (unsigned long)ret_from_fork; clear_ptrace_hw_breakpoint(p); if (clone_flags & CLONE_SETTLS) thread->tp_value = regs->ARM_r3; thread_notify(THREAD_NOTIFY_COPY, thread); return 0;} /* * Fill in the task's elfregs structure for a core dump. */int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs){ elf_core_copy_regs(elfregs, task_pt_regs(t)); return 1;} /* * fill in the fpe structure for a core dump... */int dump_fpu (struct pt_regs *regs, struct user_fp *fp){ struct thread_info *thread = current_thread_info(); int used_math = thread->used_cp[1] | thread->used_cp[2]; if (used_math) memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); return used_math != 0;}EXPORT_SYMBOL(dump_fpu); /* * Shuffle the argument into the correct register before calling the * thread function. r4 is the thread argument, r5 is the pointer to * the thread function, and r6 points to the exit function. */extern void kernel_thread_helper(void);asm( ".pushsection .text\n"" .align\n"" .type kernel_thread_helper, #function\n""kernel_thread_helper:\n"#ifdef CONFIG_TRACE_IRQFLAGS" bl trace_hardirqs_on\n"#endif" msr cpsr_c, r7\n"" mov r0, r4\n"" mov lr, r6\n"" mov pc, r5\n"" .size kernel_thread_helper, . - kernel_thread_helper\n"" .popsection"); #ifdef CONFIG_ARM_UNWINDextern void kernel_thread_exit(long code);asm( ".pushsection .text\n"" .align\n"" .type kernel_thread_exit, #function\n""kernel_thread_exit:\n"" .fnstart\n"" .cantunwind\n"" bl do_exit\n"" nop\n"" .fnend\n"" .size kernel_thread_exit, . - kernel_thread_exit\n"" .popsection");#else#define kernel_thread_exit do_exit#endif /* * Create a kernel thread. */pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags){ struct pt_regs regs; memset(®s, 0, sizeof(regs)); regs.ARM_r4 = (unsigned long)arg; regs.ARM_r5 = (unsigned long)fn; regs.ARM_r6 = (unsigned long)kernel_thread_exit; regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE; regs.ARM_pc = (unsigned long)kernel_thread_helper; regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT; return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL);}EXPORT_SYMBOL(kernel_thread); unsigned long get_wchan(struct task_struct *p){Lines 1–500 of 547. Load more
/* * linux/arch/arm/kernel/process.c * * Copyright (C) 1996-2000 Russell King - Converted to ARM. * Original Copyright (C) 1995 Linus Torvalds * * 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 <stdarg.h> #include <linux/export.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/stddef.h> #include <linux/unistd.h> #include <linux/user.h> #include <linux/delay.h> #include <linux/reboot.h> #include <linux/interrupt.h> #include <linux/kallsyms.h> #include <linux/init.h> #include <linux/cpu.h> #include <linux/elfcore.h> #include <linux/pm.h> #include <linux/tick.h> #include <linux/utsname.h> #include <linux/uaccess.h> #include <linux/random.h> #include <linux/hw_breakpoint.h> #include <linux/cpuidle.h> #include <asm/cacheflush.h> #include <asm/leds.h> #include <asm/processor.h> #include <asm/system.h> #include <asm/thread_notify.h> #include <asm/stacktrace.h> #include <asm/mach/time.h> #ifdef CONFIG_CC_STACKPROTECTOR #include <linux/stackprotector.h> unsigned long __stack_chk_guard __read_mostly; EXPORT_SYMBOL(__stack_chk_guard); #endif static const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" , "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" }; static const char *isa_modes[] = { "ARM" , "Thumb" , "Jazelle", "ThumbEE" }; extern void setup_mm_for_reboot(void); static volatile int hlt_counter; #include <mach/system.h> void disable_hlt(void) { hlt_counter++; } EXPORT_SYMBOL(disable_hlt); void enable_hlt(void) { hlt_counter--; } EXPORT_SYMBOL(enable_hlt); static int __init nohlt_setup(char *__unused) { hlt_counter = 1; return 1; } static int __init hlt_setup(char *__unused) { hlt_counter = 0; return 1; } __setup("nohlt", nohlt_setup); __setup("hlt", hlt_setup); extern void call_with_stack(void (*fn)(void *), void *arg, void *sp); typedef void (*phys_reset_t)(unsigned long); /* * A temporary stack to use for CPU reset. This is static so that we * don't clobber it with the identity mapping. When running with this * stack, any references to the current task *will not work* so you * should really do as little as possible before jumping to your reset * code. */ static u64 soft_restart_stack[16]; static void __soft_restart(void *addr) { phys_reset_t phys_reset; /* Take out a flat memory mapping. */ setup_mm_for_reboot(); /* Clean and invalidate caches */ flush_cache_all(); /* Turn off caching */ cpu_proc_fin(); /* Push out any further dirty data, and ensure cache is empty */ flush_cache_all(); /* Switch to the identity mapping. */ phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset); phys_reset((unsigned long)addr); /* Should never get here. */ BUG(); } void soft_restart(unsigned long addr) { u64 *stack = soft_restart_stack + ARRAY_SIZE(soft_restart_stack); /* Disable interrupts first */ local_irq_disable(); local_fiq_disable(); /* Disable the L2 if we're the last man standing. */ if (num_online_cpus() == 1) outer_disable(); /* Change to the new stack and continue with the reset. */ call_with_stack(__soft_restart, (void *)addr, (void *)stack); /* Should never get here. */ BUG(); } static void null_restart(char mode, const char *cmd) { } /* * Function pointers to optional machine specific functions */ void (*pm_power_off)(void); EXPORT_SYMBOL(pm_power_off); void (*arm_pm_restart)(char str, const char *cmd) = null_restart; EXPORT_SYMBOL_GPL(arm_pm_restart); static void do_nothing(void *unused) { } /* * cpu_idle_wait - Used to ensure that all the CPUs discard old value of * pm_idle and update to new pm_idle value. Required while changing pm_idle * handler on SMP systems. * * Caller must have changed pm_idle to the new value before the call. Old * pm_idle value will not be used by any CPU after the return of this function. */ void cpu_idle_wait(void) { smp_mb(); /* kick all the CPUs so that they exit out of pm_idle */ smp_call_function(do_nothing, NULL, 1); } EXPORT_SYMBOL_GPL(cpu_idle_wait); /* * This is our default idle handler. We need to disable * interrupts here to ensure we don't miss a wakeup call. */ static void default_idle(void) { if (!need_resched()) arch_idle(); local_irq_enable(); } void (*pm_idle)(void) = default_idle; EXPORT_SYMBOL(pm_idle); /* * The idle thread, has rather strange semantics for calling pm_idle, * but this is what x86 does and we need to do the same, so that * things like cpuidle get called in the same way. The only difference * is that we always respect 'hlt_counter' to prevent low power idle. */ void cpu_idle(void) { local_fiq_enable(); /* endless idle loop with no priority at all */ while (1) { tick_nohz_idle_enter(); rcu_idle_enter(); leds_event(led_idle_start); while (!need_resched()) { #ifdef CONFIG_HOTPLUG_CPU if (cpu_is_offline(smp_processor_id())) cpu_die(); #endif local_irq_disable(); #ifdef CONFIG_PL310_ERRATA_769419 wmb(); #endif if (hlt_counter) { local_irq_enable(); cpu_relax(); } else { stop_critical_timings(); if (cpuidle_idle_call()) pm_idle(); start_critical_timings(); /* * This will eventually be removed - pm_idle * functions should always return with IRQs * enabled. */ WARN_ON(irqs_disabled()); local_irq_enable(); } } leds_event(led_idle_end); rcu_idle_exit(); tick_nohz_idle_exit(); preempt_enable_no_resched(); schedule(); preempt_disable(); } } static char reboot_mode = 'h'; int __init reboot_setup(char *str) { reboot_mode = str[0]; return 1; } __setup("reboot=", reboot_setup); void machine_shutdown(void) { #ifdef CONFIG_SMP smp_send_stop(); #endif } void machine_halt(void) { machine_shutdown(); while (1); } void machine_power_off(void) { machine_shutdown(); if (pm_power_off) pm_power_off(); } void machine_restart(char *cmd) { machine_shutdown(); arm_pm_restart(reboot_mode, cmd); /* Give a grace period for failure to restart of 1s */ mdelay(1000); /* Whoops - the platform was unable to reboot. Tell the user! */ printk("Reboot failed -- System halted\n"); while (1); } void __show_regs(struct pt_regs *regs) { unsigned long flags; char buf[64]; printk("CPU: %d %s (%s %.*s)\n", raw_smp_processor_id(), print_tainted(), init_utsname()->release, (int)strcspn(init_utsname()->version, " "), init_utsname()->version); print_symbol("PC is at %s\n", instruction_pointer(regs)); print_symbol("LR is at %s\n", regs->ARM_lr); printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n" "sp : %08lx ip : %08lx fp : %08lx\n", regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); printk("r10: %08lx r9 : %08lx r8 : %08lx\n", regs->ARM_r10, regs->ARM_r9, regs->ARM_r8); printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4); printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0); flags = regs->ARM_cpsr; buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; buf[4] = '\0'; printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", buf, interrupts_enabled(regs) ? "n" : "ff", fast_interrupts_enabled(regs) ? "n" : "ff", processor_modes[processor_mode(regs)], isa_modes[isa_mode(regs)], get_fs() == get_ds() ? "kernel" : "user"); #ifdef CONFIG_CPU_CP15 { unsigned int ctrl; buf[0] = '\0'; #ifdef CONFIG_CPU_CP15_MMU { unsigned int transbase, dac; asm("mrc p15, 0, %0, c2, c0\n\t" "mrc p15, 0, %1, c3, c0\n" : "=r" (transbase), "=r" (dac)); snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", transbase, dac); } #endif asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); printk("Control: %08x%s\n", ctrl, buf); } #endif } void show_regs(struct pt_regs * regs) { printk("\n"); printk("Pid: %d, comm: %20s\n", task_pid_nr(current), current->comm); __show_regs(regs); dump_stack(); } ATOMIC_NOTIFIER_HEAD(thread_notify_head); EXPORT_SYMBOL_GPL(thread_notify_head); /* * Free current thread data structures etc.. */ void exit_thread(void) { thread_notify(THREAD_NOTIFY_EXIT, current_thread_info()); } void flush_thread(void) { struct thread_info *thread = current_thread_info(); struct task_struct *tsk = current; flush_ptrace_hw_breakpoint(tsk); memset(thread->used_cp, 0, sizeof(thread->used_cp)); memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); memset(&thread->fpstate, 0, sizeof(union fp_state)); thread_notify(THREAD_NOTIFY_FLUSH, thread); } void release_thread(struct task_struct *dead_task) { } asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); int copy_thread(unsigned long clone_flags, unsigned long stack_start, unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs) { struct thread_info *thread = task_thread_info(p); struct pt_regs *childregs = task_pt_regs(p); *childregs = *regs; childregs->ARM_r0 = 0; childregs->ARM_sp = stack_start; memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); thread->cpu_context.sp = (unsigned long)childregs; thread->cpu_context.pc = (unsigned long)ret_from_fork; clear_ptrace_hw_breakpoint(p); if (clone_flags & CLONE_SETTLS) thread->tp_value = regs->ARM_r3; thread_notify(THREAD_NOTIFY_COPY, thread); return 0; } /* * Fill in the task's elfregs structure for a core dump. */ int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs) { elf_core_copy_regs(elfregs, task_pt_regs(t)); return 1; } /* * fill in the fpe structure for a core dump... */ int dump_fpu (struct pt_regs *regs, struct user_fp *fp) { struct thread_info *thread = current_thread_info(); int used_math = thread->used_cp[1] | thread->used_cp[2]; if (used_math) memcpy(fp, &thread->fpstate.soft, sizeof (*fp)); return used_math != 0; } EXPORT_SYMBOL(dump_fpu); /* * Shuffle the argument into the correct register before calling the * thread function. r4 is the thread argument, r5 is the pointer to * the thread function, and r6 points to the exit function. */ extern void kernel_thread_helper(void); asm( ".pushsection .text\n" " .align\n" " .type kernel_thread_helper, #function\n" "kernel_thread_helper:\n" #ifdef CONFIG_TRACE_IRQFLAGS " bl trace_hardirqs_on\n" #endif " msr cpsr_c, r7\n" " mov r0, r4\n" " mov lr, r6\n" " mov pc, r5\n" " .size kernel_thread_helper, . - kernel_thread_helper\n" " .popsection"); #ifdef CONFIG_ARM_UNWIND extern void kernel_thread_exit(long code); asm( ".pushsection .text\n" " .align\n" " .type kernel_thread_exit, #function\n" "kernel_thread_exit:\n" " .fnstart\n" " .cantunwind\n" " bl do_exit\n" " nop\n" " .fnend\n" " .size kernel_thread_exit, . - kernel_thread_exit\n" " .popsection"); #else #define kernel_thread_exit do_exit #endif /* * Create a kernel thread. */ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) { struct pt_regs regs; memset(®s, 0, sizeof(regs)); regs.ARM_r4 = (unsigned long)arg; regs.ARM_r5 = (unsigned long)fn; regs.ARM_r6 = (unsigned long)kernel_thread_exit; regs.ARM_r7 = SVC_MODE | PSR_ENDSTATE | PSR_ISETSTATE; regs.ARM_pc = (unsigned long)kernel_thread_helper; regs.ARM_cpsr = regs.ARM_r7 | PSR_I_BIT; return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, ®s, 0, NULL, NULL); } EXPORT_SYMBOL(kernel_thread); unsigned long get_wchan(struct task_struct *p) {