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439 lines
10 KiB
439 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/process.c |
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* |
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* Copyright (C) 1996-2000 Russell King - Converted to ARM. |
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* Original Copyright (C) 1995 Linus Torvalds |
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*/ |
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#include <stdarg.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/stddef.h> |
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#include <linux/unistd.h> |
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#include <linux/user.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/elfcore.h> |
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#include <linux/pm.h> |
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#include <linux/tick.h> |
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#include <linux/utsname.h> |
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#include <linux/uaccess.h> |
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#include <linux/random.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/leds.h> |
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#include <asm/processor.h> |
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#include <asm/thread_notify.h> |
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#include <asm/stacktrace.h> |
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#include <asm/system_misc.h> |
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#include <asm/mach/time.h> |
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#include <asm/tls.h> |
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#include <asm/vdso.h> |
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#include "signal.h" |
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#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK) |
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#include <linux/stackprotector.h> |
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unsigned long __stack_chk_guard __read_mostly; |
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EXPORT_SYMBOL(__stack_chk_guard); |
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#endif |
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static const char *processor_modes[] __maybe_unused = { |
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"USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" , |
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"UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26", |
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"USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "MON_32" , "ABT_32" , |
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"UK8_32" , "UK9_32" , "HYP_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32" |
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}; |
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static const char *isa_modes[] __maybe_unused = { |
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"ARM" , "Thumb" , "Jazelle", "ThumbEE" |
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}; |
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/* |
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* This is our default idle handler. |
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*/ |
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void (*arm_pm_idle)(void); |
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/* |
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* Called from the core idle loop. |
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*/ |
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void arch_cpu_idle(void) |
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{ |
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if (arm_pm_idle) |
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arm_pm_idle(); |
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else |
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cpu_do_idle(); |
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raw_local_irq_enable(); |
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} |
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void arch_cpu_idle_prepare(void) |
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{ |
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local_fiq_enable(); |
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} |
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void arch_cpu_idle_enter(void) |
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{ |
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ledtrig_cpu(CPU_LED_IDLE_START); |
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#ifdef CONFIG_PL310_ERRATA_769419 |
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wmb(); |
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#endif |
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} |
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void arch_cpu_idle_exit(void) |
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{ |
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ledtrig_cpu(CPU_LED_IDLE_END); |
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} |
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void __show_regs(struct pt_regs *regs) |
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{ |
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unsigned long flags; |
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char buf[64]; |
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#ifndef CONFIG_CPU_V7M |
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unsigned int domain, fs; |
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN |
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/* |
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* Get the domain register for the parent context. In user |
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* mode, we don't save the DACR, so lets use what it should |
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* be. For other modes, we place it after the pt_regs struct. |
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*/ |
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if (user_mode(regs)) { |
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domain = DACR_UACCESS_ENABLE; |
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fs = get_fs(); |
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} else { |
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domain = to_svc_pt_regs(regs)->dacr; |
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fs = to_svc_pt_regs(regs)->addr_limit; |
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} |
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#else |
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domain = get_domain(); |
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fs = get_fs(); |
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#endif |
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#endif |
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show_regs_print_info(KERN_DEFAULT); |
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printk("PC is at %pS\n", (void *)instruction_pointer(regs)); |
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printk("LR is at %pS\n", (void *)regs->ARM_lr); |
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printk("pc : [<%08lx>] lr : [<%08lx>] psr: %08lx\n", |
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regs->ARM_pc, regs->ARM_lr, regs->ARM_cpsr); |
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printk("sp : %08lx ip : %08lx fp : %08lx\n", |
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regs->ARM_sp, regs->ARM_ip, regs->ARM_fp); |
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printk("r10: %08lx r9 : %08lx r8 : %08lx\n", |
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regs->ARM_r10, regs->ARM_r9, |
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regs->ARM_r8); |
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printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", |
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regs->ARM_r7, regs->ARM_r6, |
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regs->ARM_r5, regs->ARM_r4); |
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printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", |
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regs->ARM_r3, regs->ARM_r2, |
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regs->ARM_r1, regs->ARM_r0); |
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flags = regs->ARM_cpsr; |
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buf[0] = flags & PSR_N_BIT ? 'N' : 'n'; |
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buf[1] = flags & PSR_Z_BIT ? 'Z' : 'z'; |
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buf[2] = flags & PSR_C_BIT ? 'C' : 'c'; |
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buf[3] = flags & PSR_V_BIT ? 'V' : 'v'; |
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buf[4] = '\0'; |
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#ifndef CONFIG_CPU_V7M |
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{ |
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const char *segment; |
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if ((domain & domain_mask(DOMAIN_USER)) == |
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domain_val(DOMAIN_USER, DOMAIN_NOACCESS)) |
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segment = "none"; |
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else if (fs == KERNEL_DS) |
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segment = "kernel"; |
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else |
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segment = "user"; |
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printk("Flags: %s IRQs o%s FIQs o%s Mode %s ISA %s Segment %s\n", |
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buf, interrupts_enabled(regs) ? "n" : "ff", |
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fast_interrupts_enabled(regs) ? "n" : "ff", |
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processor_modes[processor_mode(regs)], |
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isa_modes[isa_mode(regs)], segment); |
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} |
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#else |
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printk("xPSR: %08lx\n", regs->ARM_cpsr); |
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#endif |
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#ifdef CONFIG_CPU_CP15 |
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{ |
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unsigned int ctrl; |
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buf[0] = '\0'; |
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#ifdef CONFIG_CPU_CP15_MMU |
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{ |
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unsigned int transbase; |
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asm("mrc p15, 0, %0, c2, c0\n\t" |
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: "=r" (transbase)); |
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snprintf(buf, sizeof(buf), " Table: %08x DAC: %08x", |
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transbase, domain); |
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} |
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#endif |
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asm("mrc p15, 0, %0, c1, c0\n" : "=r" (ctrl)); |
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printk("Control: %08x%s\n", ctrl, buf); |
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} |
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#endif |
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} |
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void show_regs(struct pt_regs * regs) |
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{ |
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__show_regs(regs); |
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dump_stack(); |
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} |
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ATOMIC_NOTIFIER_HEAD(thread_notify_head); |
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EXPORT_SYMBOL_GPL(thread_notify_head); |
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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(struct task_struct *tsk) |
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{ |
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thread_notify(THREAD_NOTIFY_EXIT, task_thread_info(tsk)); |
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} |
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void flush_thread(void) |
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{ |
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struct thread_info *thread = current_thread_info(); |
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struct task_struct *tsk = current; |
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flush_ptrace_hw_breakpoint(tsk); |
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memset(thread->used_cp, 0, sizeof(thread->used_cp)); |
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memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); |
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memset(&thread->fpstate, 0, sizeof(union fp_state)); |
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flush_tls(); |
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thread_notify(THREAD_NOTIFY_FLUSH, thread); |
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} |
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void release_thread(struct task_struct *dead_task) |
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{ |
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} |
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asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); |
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int copy_thread(unsigned long clone_flags, unsigned long stack_start, |
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unsigned long stk_sz, struct task_struct *p, unsigned long tls) |
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{ |
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struct thread_info *thread = task_thread_info(p); |
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struct pt_regs *childregs = task_pt_regs(p); |
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memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save)); |
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#ifdef CONFIG_CPU_USE_DOMAINS |
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/* |
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* Copy the initial value of the domain access control register |
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* from the current thread: thread->addr_limit will have been |
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* copied from the current thread via setup_thread_stack() in |
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* kernel/fork.c |
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*/ |
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thread->cpu_domain = get_domain(); |
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#endif |
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if (likely(!(p->flags & (PF_KTHREAD | PF_IO_WORKER)))) { |
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*childregs = *current_pt_regs(); |
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childregs->ARM_r0 = 0; |
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if (stack_start) |
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childregs->ARM_sp = stack_start; |
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} else { |
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memset(childregs, 0, sizeof(struct pt_regs)); |
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thread->cpu_context.r4 = stk_sz; |
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thread->cpu_context.r5 = stack_start; |
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childregs->ARM_cpsr = SVC_MODE; |
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} |
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thread->cpu_context.pc = (unsigned long)ret_from_fork; |
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thread->cpu_context.sp = (unsigned long)childregs; |
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clear_ptrace_hw_breakpoint(p); |
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if (clone_flags & CLONE_SETTLS) |
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thread->tp_value[0] = tls; |
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thread->tp_value[1] = get_tpuser(); |
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thread_notify(THREAD_NOTIFY_COPY, thread); |
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#ifdef CONFIG_STACKPROTECTOR_PER_TASK |
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thread->stack_canary = p->stack_canary; |
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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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struct stackframe frame; |
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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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frame.fp = thread_saved_fp(p); |
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frame.sp = thread_saved_sp(p); |
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frame.lr = 0; /* recovered from the stack */ |
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frame.pc = thread_saved_pc(p); |
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stack_page = (unsigned long)task_stack_page(p); |
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do { |
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if (frame.sp < stack_page || |
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frame.sp >= stack_page + THREAD_SIZE || |
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unwind_frame(&frame) < 0) |
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return 0; |
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if (!in_sched_functions(frame.pc)) |
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return frame.pc; |
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} while (count ++ < 16); |
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return 0; |
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} |
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#ifdef CONFIG_MMU |
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#ifdef CONFIG_KUSER_HELPERS |
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/* |
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* The vectors page is always readable from user space for the |
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* atomic helpers. Insert it into the gate_vma so that it is visible |
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* through ptrace and /proc/<pid>/mem. |
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*/ |
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static struct vm_area_struct gate_vma; |
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static int __init gate_vma_init(void) |
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{ |
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vma_init(&gate_vma, NULL); |
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gate_vma.vm_page_prot = PAGE_READONLY_EXEC; |
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gate_vma.vm_start = 0xffff0000; |
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gate_vma.vm_end = 0xffff0000 + PAGE_SIZE; |
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gate_vma.vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYEXEC; |
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return 0; |
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} |
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arch_initcall(gate_vma_init); |
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
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{ |
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return &gate_vma; |
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} |
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int in_gate_area(struct mm_struct *mm, unsigned long addr) |
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{ |
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return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end); |
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} |
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int in_gate_area_no_mm(unsigned long addr) |
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{ |
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return in_gate_area(NULL, addr); |
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} |
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#define is_gate_vma(vma) ((vma) == &gate_vma) |
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#else |
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#define is_gate_vma(vma) 0 |
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#endif |
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const char *arch_vma_name(struct vm_area_struct *vma) |
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{ |
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return is_gate_vma(vma) ? "[vectors]" : NULL; |
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} |
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/* If possible, provide a placement hint at a random offset from the |
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* stack for the sigpage and vdso pages. |
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*/ |
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static unsigned long sigpage_addr(const struct mm_struct *mm, |
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unsigned int npages) |
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{ |
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unsigned long offset; |
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unsigned long first; |
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unsigned long last; |
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unsigned long addr; |
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unsigned int slots; |
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first = PAGE_ALIGN(mm->start_stack); |
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last = TASK_SIZE - (npages << PAGE_SHIFT); |
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/* No room after stack? */ |
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if (first > last) |
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return 0; |
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/* Just enough room? */ |
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if (first == last) |
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return first; |
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slots = ((last - first) >> PAGE_SHIFT) + 1; |
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offset = get_random_int() % slots; |
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addr = first + (offset << PAGE_SHIFT); |
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return addr; |
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} |
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static struct page *signal_page; |
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extern struct page *get_signal_page(void); |
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static int sigpage_mremap(const struct vm_special_mapping *sm, |
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struct vm_area_struct *new_vma) |
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{ |
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current->mm->context.sigpage = new_vma->vm_start; |
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return 0; |
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} |
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static const struct vm_special_mapping sigpage_mapping = { |
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.name = "[sigpage]", |
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.pages = &signal_page, |
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.mremap = sigpage_mremap, |
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}; |
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
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{ |
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struct mm_struct *mm = current->mm; |
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struct vm_area_struct *vma; |
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unsigned long npages; |
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unsigned long addr; |
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unsigned long hint; |
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int ret = 0; |
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if (!signal_page) |
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signal_page = get_signal_page(); |
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if (!signal_page) |
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return -ENOMEM; |
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npages = 1; /* for sigpage */ |
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npages += vdso_total_pages; |
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if (mmap_write_lock_killable(mm)) |
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return -EINTR; |
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hint = sigpage_addr(mm, npages); |
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addr = get_unmapped_area(NULL, hint, npages << PAGE_SHIFT, 0, 0); |
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if (IS_ERR_VALUE(addr)) { |
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ret = addr; |
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goto up_fail; |
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} |
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vma = _install_special_mapping(mm, addr, PAGE_SIZE, |
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VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, |
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&sigpage_mapping); |
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if (IS_ERR(vma)) { |
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ret = PTR_ERR(vma); |
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goto up_fail; |
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} |
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mm->context.sigpage = addr; |
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/* Unlike the sigpage, failure to install the vdso is unlikely |
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* to be fatal to the process, so no error check needed |
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* here. |
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*/ |
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arm_install_vdso(mm, addr + PAGE_SIZE); |
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up_fail: |
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mmap_write_unlock(mm); |
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return ret; |
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} |
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#endif
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