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305 lines
7.8 KiB
305 lines
7.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PARISC Architecture-dependent parts of process handling |
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* based on the work for i386 |
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* |
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> |
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* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> |
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* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> |
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* Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> |
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> |
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* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> |
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* Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> |
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* Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
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* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> |
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* Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> |
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* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> |
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* Copyright (C) 2001-2014 Helge Deller <[email protected]> |
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* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> |
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*/ |
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#include <stdarg.h> |
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#include <linux/elf.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include <linux/cpu.h> |
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#include <linux/module.h> |
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#include <linux/personality.h> |
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#include <linux/ptrace.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/slab.h> |
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#include <linux/stddef.h> |
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#include <linux/unistd.h> |
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#include <linux/kallsyms.h> |
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#include <linux/uaccess.h> |
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#include <linux/rcupdate.h> |
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#include <linux/random.h> |
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#include <linux/nmi.h> |
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#include <asm/io.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/assembly.h> |
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#include <asm/pdc.h> |
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#include <asm/pdc_chassis.h> |
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#include <asm/unwind.h> |
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#include <asm/sections.h> |
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#define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
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#define CMD_RESET 5 /* reset any module */ |
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/* |
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** The Wright Brothers and Gecko systems have a H/W problem |
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** (Lasi...'nuf said) may cause a broadcast reset to lockup |
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** the system. An HVERSION dependent PDC call was developed |
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** to perform a "safe", platform specific broadcast reset instead |
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** of kludging up all the code. |
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** |
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** Older machines which do not implement PDC_BROADCAST_RESET will |
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** return (with an error) and the regular broadcast reset can be |
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** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET |
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** the PDC call will not return (the system will be reset). |
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*/ |
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void machine_restart(char *cmd) |
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{ |
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#ifdef FASTBOOT_SELFTEST_SUPPORT |
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/* |
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** If user has modified the Firmware Selftest Bitmap, |
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** run the tests specified in the bitmap after the |
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** system is rebooted w/PDC_DO_RESET. |
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** |
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** ftc_bitmap = 0x1AUL "Skip destructive memory tests" |
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** |
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** Using "directed resets" at each processor with the MEM_TOC |
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** vector cleared will also avoid running destructive |
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** memory self tests. (Not implemented yet) |
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*/ |
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if (ftc_bitmap) { |
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pdc_do_firm_test_reset(ftc_bitmap); |
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} |
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#endif |
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/* set up a new led state on systems shipped with a LED State panel */ |
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); |
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/* "Normal" system reset */ |
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pdc_do_reset(); |
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/* Nope...box should reset with just CMD_RESET now */ |
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gsc_writel(CMD_RESET, COMMAND_GLOBAL); |
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/* Wait for RESET to lay us to rest. */ |
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while (1) ; |
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} |
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void (*chassis_power_off)(void); |
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/* |
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* This routine is called from sys_reboot to actually turn off the |
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* machine |
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*/ |
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void machine_power_off(void) |
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{ |
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/* If there is a registered power off handler, call it. */ |
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if (chassis_power_off) |
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chassis_power_off(); |
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/* Put the soft power button back under hardware control. |
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* If the user had already pressed the power button, the |
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* following call will immediately power off. */ |
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pdc_soft_power_button(0); |
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pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); |
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/* ipmi_poweroff may have been installed. */ |
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if (pm_power_off) |
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pm_power_off(); |
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/* It seems we have no way to power the system off via |
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* software. The user has to press the button himself. */ |
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printk(KERN_EMERG "System shut down completed.\n" |
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"Please power this system off now."); |
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/* prevent soft lockup/stalled CPU messages for endless loop. */ |
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rcu_sysrq_start(); |
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lockup_detector_soft_poweroff(); |
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for (;;); |
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} |
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void (*pm_power_off)(void); |
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EXPORT_SYMBOL(pm_power_off); |
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void machine_halt(void) |
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{ |
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machine_power_off(); |
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} |
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void flush_thread(void) |
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{ |
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/* Only needs to handle fpu stuff or perf monitors. |
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** REVISIT: several arches implement a "lazy fpu state". |
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*/ |
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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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/* |
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* Idle thread support |
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* |
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* Detect when running on QEMU with SeaBIOS PDC Firmware and let |
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* QEMU idle the host too. |
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*/ |
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int running_on_qemu __ro_after_init; |
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EXPORT_SYMBOL(running_on_qemu); |
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void __cpuidle arch_cpu_idle_dead(void) |
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{ |
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/* nop on real hardware, qemu will offline CPU. */ |
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asm volatile("or %%r31,%%r31,%%r31\n":::); |
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} |
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void __cpuidle arch_cpu_idle(void) |
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{ |
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raw_local_irq_enable(); |
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/* nop on real hardware, qemu will idle sleep. */ |
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asm volatile("or %%r10,%%r10,%%r10\n":::); |
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} |
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static int __init parisc_idle_init(void) |
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{ |
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if (!running_on_qemu) |
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cpu_idle_poll_ctrl(1); |
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return 0; |
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} |
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arch_initcall(parisc_idle_init); |
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/* |
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* Copy architecture-specific thread state |
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*/ |
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int |
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copy_thread(unsigned long clone_flags, unsigned long usp, |
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unsigned long kthread_arg, struct task_struct *p, unsigned long tls) |
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{ |
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struct pt_regs *cregs = &(p->thread.regs); |
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void *stack = task_stack_page(p); |
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/* We have to use void * instead of a function pointer, because |
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* function pointers aren't a pointer to the function on 64-bit. |
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* Make them const so the compiler knows they live in .text */ |
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extern void * const ret_from_kernel_thread; |
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extern void * const child_return; |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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/* kernel thread */ |
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memset(cregs, 0, sizeof(struct pt_regs)); |
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if (!usp) /* idle thread */ |
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return 0; |
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/* Must exit via ret_from_kernel_thread in order |
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* to call schedule_tail() |
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*/ |
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
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cregs->kpc = (unsigned long) &ret_from_kernel_thread; |
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/* |
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* Copy function and argument to be called from |
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* ret_from_kernel_thread. |
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*/ |
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#ifdef CONFIG_64BIT |
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cregs->gr[27] = ((unsigned long *)usp)[3]; |
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cregs->gr[26] = ((unsigned long *)usp)[2]; |
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#else |
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cregs->gr[26] = usp; |
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#endif |
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cregs->gr[25] = kthread_arg; |
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} else { |
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/* user thread */ |
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/* usp must be word aligned. This also prevents users from |
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* passing in the value 1 (which is the signal for a special |
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* return for a kernel thread) */ |
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if (usp) { |
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usp = ALIGN(usp, 4); |
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if (likely(usp)) |
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cregs->gr[30] = usp; |
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} |
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
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cregs->kpc = (unsigned long) &child_return; |
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/* Setup thread TLS area */ |
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if (clone_flags & CLONE_SETTLS) |
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cregs->cr27 = tls; |
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} |
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return 0; |
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} |
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unsigned long |
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get_wchan(struct task_struct *p) |
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{ |
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struct unwind_frame_info info; |
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unsigned long ip; |
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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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/* |
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* These bracket the sleeping functions.. |
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*/ |
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unwind_frame_init_from_blocked_task(&info, p); |
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do { |
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if (unwind_once(&info) < 0) |
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return 0; |
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if (p->state == TASK_RUNNING) |
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return 0; |
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ip = info.ip; |
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if (!in_sched_functions(ip)) |
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return ip; |
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} while (count++ < MAX_UNWIND_ENTRIES); |
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return 0; |
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} |
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#ifdef CONFIG_64BIT |
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void *dereference_function_descriptor(void *ptr) |
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{ |
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Elf64_Fdesc *desc = ptr; |
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void *p; |
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if (!get_kernel_nofault(p, (void *)&desc->addr)) |
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ptr = p; |
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return ptr; |
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} |
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void *dereference_kernel_function_descriptor(void *ptr) |
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{ |
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if (ptr < (void *)__start_opd || |
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ptr >= (void *)__end_opd) |
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return ptr; |
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return dereference_function_descriptor(ptr); |
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} |
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#endif |
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static inline unsigned long brk_rnd(void) |
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{ |
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return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; |
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} |
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unsigned long arch_randomize_brk(struct mm_struct *mm) |
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{ |
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unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd()); |
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if (ret < mm->brk) |
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return mm->brk; |
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return ret; |
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}
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