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262 lines
6.0 KiB
262 lines
6.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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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_stack.h> |
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#include <linux/delay.h> |
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#include <linux/kallsyms.h> |
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#include <linux/uaccess.h> |
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#include <asm/elf.h> |
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#include <asm/proc-fns.h> |
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#include <asm/fpu.h> |
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#include <linux/ptrace.h> |
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#include <linux/reboot.h> |
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#if IS_ENABLED(CONFIG_LAZY_FPU) |
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struct task_struct *last_task_used_math; |
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#endif |
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extern void setup_mm_for_reboot(char mode); |
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extern inline void arch_reset(char mode) |
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{ |
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if (mode == 's') { |
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/* Use cpu handler, jump to 0 */ |
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cpu_reset(0); |
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} |
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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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static char reboot_mode_nds32 = 'h'; |
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int __init reboot_setup(char *str) |
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{ |
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reboot_mode_nds32 = str[0]; |
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return 1; |
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} |
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static int cpub_pwroff(void) |
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{ |
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return 0; |
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} |
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__setup("reboot=", reboot_setup); |
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void machine_halt(void) |
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{ |
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cpub_pwroff(); |
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} |
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EXPORT_SYMBOL(machine_halt); |
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void machine_power_off(void) |
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{ |
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if (pm_power_off) |
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pm_power_off(); |
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} |
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EXPORT_SYMBOL(machine_power_off); |
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void machine_restart(char *cmd) |
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{ |
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/* |
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* Clean and disable cache, and turn off interrupts |
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*/ |
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cpu_proc_fin(); |
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/* |
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* Tell the mm system that we are going to reboot - |
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* we may need it to insert some 1:1 mappings so that |
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* soft boot works. |
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*/ |
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setup_mm_for_reboot(reboot_mode_nds32); |
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/* Execute kernel restart handler call chain */ |
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do_kernel_restart(cmd); |
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/* |
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* Now call the architecture specific reboot code. |
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*/ |
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arch_reset(reboot_mode_nds32); |
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/* |
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* Whoops - the architecture was unable to reboot. |
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* Tell the user! |
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*/ |
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mdelay(1000); |
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pr_info("Reboot failed -- System halted\n"); |
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while (1) ; |
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} |
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EXPORT_SYMBOL(machine_restart); |
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void show_regs(struct pt_regs *regs) |
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{ |
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printk("PC is at %pS\n", (void *)instruction_pointer(regs)); |
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printk("LP is at %pS\n", (void *)regs->lp); |
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pr_info("pc : [<%08lx>] lp : [<%08lx>] %s\n" |
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"sp : %08lx fp : %08lx gp : %08lx\n", |
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instruction_pointer(regs), |
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regs->lp, print_tainted(), regs->sp, regs->fp, regs->gp); |
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pr_info("r25: %08lx r24: %08lx\n", regs->uregs[25], regs->uregs[24]); |
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pr_info("r23: %08lx r22: %08lx r21: %08lx r20: %08lx\n", |
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regs->uregs[23], regs->uregs[22], |
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regs->uregs[21], regs->uregs[20]); |
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pr_info("r19: %08lx r18: %08lx r17: %08lx r16: %08lx\n", |
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regs->uregs[19], regs->uregs[18], |
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regs->uregs[17], regs->uregs[16]); |
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pr_info("r15: %08lx r14: %08lx r13: %08lx r12: %08lx\n", |
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regs->uregs[15], regs->uregs[14], |
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regs->uregs[13], regs->uregs[12]); |
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pr_info("r11: %08lx r10: %08lx r9 : %08lx r8 : %08lx\n", |
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regs->uregs[11], regs->uregs[10], |
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regs->uregs[9], regs->uregs[8]); |
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pr_info("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n", |
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regs->uregs[7], regs->uregs[6], regs->uregs[5], regs->uregs[4]); |
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pr_info("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n", |
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regs->uregs[3], regs->uregs[2], regs->uregs[1], regs->uregs[0]); |
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pr_info(" IRQs o%s Segment %s\n", |
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interrupts_enabled(regs) ? "n" : "ff", |
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uaccess_kernel() ? "kernel" : "user"); |
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} |
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EXPORT_SYMBOL(show_regs); |
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void exit_thread(struct task_struct *tsk) |
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{ |
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#if defined(CONFIG_FPU) && defined(CONFIG_LAZY_FPU) |
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if (last_task_used_math == tsk) |
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last_task_used_math = NULL; |
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#endif |
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} |
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void flush_thread(void) |
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{ |
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#if defined(CONFIG_FPU) |
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clear_fpu(task_pt_regs(current)); |
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clear_used_math(); |
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# ifdef CONFIG_LAZY_FPU |
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if (last_task_used_math == current) |
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last_task_used_math = NULL; |
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# endif |
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#endif |
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} |
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DEFINE_PER_CPU(struct task_struct *, __entry_task); |
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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 pt_regs *childregs = task_pt_regs(p); |
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memset(&p->thread.cpu_context, 0, sizeof(struct cpu_context)); |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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memset(childregs, 0, sizeof(struct pt_regs)); |
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/* kernel thread fn */ |
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p->thread.cpu_context.r6 = stack_start; |
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/* kernel thread argument */ |
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p->thread.cpu_context.r7 = stk_sz; |
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} else { |
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*childregs = *current_pt_regs(); |
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if (stack_start) |
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childregs->sp = stack_start; |
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/* child get zero as ret. */ |
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childregs->uregs[0] = 0; |
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childregs->osp = 0; |
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if (clone_flags & CLONE_SETTLS) |
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childregs->uregs[25] = tls; |
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} |
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/* cpu context switching */ |
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p->thread.cpu_context.pc = (unsigned long)ret_from_fork; |
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p->thread.cpu_context.sp = (unsigned long)childregs; |
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#if IS_ENABLED(CONFIG_FPU) |
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if (used_math()) { |
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# if !IS_ENABLED(CONFIG_LAZY_FPU) |
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unlazy_fpu(current); |
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# else |
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preempt_disable(); |
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if (last_task_used_math == current) |
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save_fpu(current); |
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preempt_enable(); |
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# endif |
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p->thread.fpu = current->thread.fpu; |
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clear_fpu(task_pt_regs(p)); |
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set_stopped_child_used_math(p); |
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} |
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#endif |
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#ifdef CONFIG_HWZOL |
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childregs->lb = 0; |
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childregs->le = 0; |
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childregs->lc = 0; |
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#endif |
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return 0; |
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} |
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#if IS_ENABLED(CONFIG_FPU) |
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struct task_struct *_switch_fpu(struct task_struct *prev, struct task_struct *next) |
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{ |
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#if !IS_ENABLED(CONFIG_LAZY_FPU) |
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unlazy_fpu(prev); |
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#endif |
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if (!(next->flags & PF_KTHREAD)) |
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clear_fpu(task_pt_regs(next)); |
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return prev; |
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} |
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#endif |
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/* |
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* fill in the fpe structure for a core dump... |
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*/ |
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpu) |
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{ |
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int fpvalid = 0; |
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#if IS_ENABLED(CONFIG_FPU) |
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struct task_struct *tsk = current; |
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fpvalid = tsk_used_math(tsk); |
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if (fpvalid) { |
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lose_fpu(); |
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memcpy(fpu, &tsk->thread.fpu, sizeof(*fpu)); |
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} |
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#endif |
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return fpvalid; |
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} |
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EXPORT_SYMBOL(dump_fpu); |
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unsigned long get_wchan(struct task_struct *p) |
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{ |
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unsigned long fp, lr; |
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unsigned long stack_start, stack_end; |
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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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if (IS_ENABLED(CONFIG_FRAME_POINTER)) { |
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stack_start = (unsigned long)end_of_stack(p); |
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stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE; |
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fp = thread_saved_fp(p); |
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do { |
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if (fp < stack_start || fp > stack_end) |
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return 0; |
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lr = ((unsigned long *)fp)[0]; |
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if (!in_sched_functions(lr)) |
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return lr; |
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fp = *(unsigned long *)(fp + 4); |
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} while (count++ < 16); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL(get_wchan);
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