| 1 | |
| 2 | * Copyright (C) 2008-2009 Michal Simek <[email protected]>
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| 3 | * Copyright (C) 2008-2009 PetaLogix
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| 4 | * Copyright (C) 2006 Atmark Techno, Inc.
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| 5 | *
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| 6 | * This file is subject to the terms and conditions of the GNU General Public
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| 7 | * License. See the file "COPYING" in the main directory of this archive
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| 8 | * for more details.
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| 9 |
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| 10 |
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| 11 | #include <linux/cpu.h>
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| 12 | #include <linux/export.h>
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| 13 | #include <linux/sched.h>
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| 14 | #include <linux/sched/debug.h>
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| 15 | #include <linux/sched/task.h>
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| 16 | #include <linux/sched/task_stack.h>
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| 17 | #include <linux/pm.h>
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| 18 | #include <linux/tick.h>
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| 19 | #include <linux/bitops.h>
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| 20 | #include <linux/ptrace.h>
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| 21 | #include <asm/cacheflush.h>
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| 22 |
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| 23 | void show_regs(struct pt_regs *regs)
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| 24 | {
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| 25 | show_regs_print_info(KERN_INFO);
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| 26 |
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| 27 | pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode);
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| 28 | pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
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| 29 | regs->r1, regs->r2, regs->r3, regs->r4);
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| 30 | pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
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| 31 | regs->r5, regs->r6, regs->r7, regs->r8);
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| 32 | pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
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| 33 | regs->r9, regs->r10, regs->r11, regs->r12);
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| 34 | pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
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| 35 | regs->r13, regs->r14, regs->r15, regs->r16);
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| 36 | pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
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| 37 | regs->r17, regs->r18, regs->r19, regs->r20);
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| 38 | pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
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| 39 | regs->r21, regs->r22, regs->r23, regs->r24);
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| 40 | pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
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| 41 | regs->r25, regs->r26, regs->r27, regs->r28);
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| 42 | pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
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| 43 | regs->r29, regs->r30, regs->r31, regs->pc);
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| 44 | pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
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| 45 | regs->msr, regs->ear, regs->esr, regs->fsr);
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| 46 | }
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| 47 |
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| 48 | void (*pm_power_off)(void) = NULL;
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| 49 | EXPORT_SYMBOL(pm_power_off);
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| 50 |
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| 51 | void flush_thread(void)
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| 52 | {
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| 53 | }
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| 54 |
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| 55 | int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
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| 56 | {
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| 57 | u64 clone_flags = args->flags;
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| 58 | unsigned long usp = args->stack;
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| 59 | unsigned long tls = args->tls;
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| 60 | struct pt_regs *childregs = task_pt_regs(p);
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| 61 | struct thread_info *ti = task_thread_info(p);
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| 62 |
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| 63 | if (unlikely(args->fn)) {
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| 64 | |
| 65 | * the registers. That's OK for a brand new thread.
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| 66 | memset(childregs, 0, sizeof(struct pt_regs));
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| 67 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
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| 68 | ti->cpu_context.r1 = (unsigned long)childregs;
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| 69 | ti->cpu_context.r20 = (unsigned long)args->fn;
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| 70 | ti->cpu_context.r19 = (unsigned long)args->fn_arg;
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| 71 | childregs->pt_mode = 1;
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| 72 | local_save_flags(childregs->msr);
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| 73 | ti->cpu_context.msr = childregs->msr & ~MSR_IE;
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| 74 | ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
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| 75 | return 0;
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| 76 | }
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| 77 | *childregs = *current_pt_regs();
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| 78 | if (usp)
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| 79 | childregs->r1 = usp;
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| 80 |
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| 81 | memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
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| 82 | ti->cpu_context.r1 = (unsigned long)childregs;
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| 83 | childregs->msr |= MSR_UMS;
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| 84 |
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| 85 | |
| 86 | * regs which were saved immediately after entering the kernel state
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| 87 | * before enabling VM. This MSR will be restored in switch_to and
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| 88 | * RETURN() and we want to have the right machine state there
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| 89 | * specifically this state must have INTs disabled before and enabled
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| 90 | * after performing rtbd
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| 91 | * compose the right MSR for RETURN(). It will work for switch_to also
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| 92 | * excepting for VM and UMS
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| 93 | * don't touch UMS , CARRY and cache bits
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| 94 | * right now MSR is a copy of parent one
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| 95 | childregs->msr &= ~MSR_EIP;
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| 96 | childregs->msr |= MSR_IE;
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| 97 | childregs->msr &= ~MSR_VM;
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| 98 | childregs->msr |= MSR_VMS;
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| 99 | childregs->msr |= MSR_EE;
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| 100 |
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| 101 | ti->cpu_context.msr = (childregs->msr|MSR_VM);
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| 102 | ti->cpu_context.msr &= ~MSR_UMS;
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| 103 | ti->cpu_context.msr &= ~MSR_IE;
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| 104 | ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
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| 105 |
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| 106 | |
| 107 | * r21 is the thread reg, r10 is 6th arg to clone
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| 108 | * which contains TLS area
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| 109 |
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| 110 | if (clone_flags & CLONE_SETTLS)
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| 111 | childregs->r21 = tls;
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| 112 |
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| 113 | return 0;
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| 114 | }
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| 115 |
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| 116 | unsigned long __get_wchan(struct task_struct *p)
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| 117 | {
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| 118 |
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| 119 | return 0;
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| 120 | }
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| 121 |
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| 122 |
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| 123 | void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
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| 124 | {
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| 125 | regs->pc = pc;
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| 126 | regs->r1 = usp;
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| 127 | regs->pt_mode = 0;
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| 128 | regs->msr |= MSR_UMS;
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| 129 | regs->msr &= ~MSR_VM;
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| 130 | }
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| 131 |
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| 132 | #include <linux/elfcore.h>
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| 133 | |
| 134 | * Set up a thread for executing a new program
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| 135 |
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| 136 | int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
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| 137 | {
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| 138 | return 0;
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| 139 | }
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| 140 |
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| 141 | void arch_cpu_idle(void)
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| 142 | {
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| 143 | }
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