1 /* 2 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 3 * Copyright (C) 2008-2009 PetaLogix 4 * Copyright (C) 2006 Atmark Techno, Inc. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 */ 10 11 #include <linux/cpu.h> 12 #include <linux/export.h> 13 #include <linux/sched.h> 14 #include <linux/sched/debug.h> 15 #include <linux/sched/task.h> 16 #include <linux/sched/task_stack.h> 17 #include <linux/pm.h> 18 #include <linux/tick.h> 19 #include <linux/bitops.h> 20 #include <linux/ptrace.h> 21 #include <linux/uaccess.h> /* for USER_DS macros */ 22 #include <asm/cacheflush.h> 23 24 void show_regs(struct pt_regs *regs) 25 { 26 show_regs_print_info(KERN_INFO); 27 28 pr_info(" Registers dump: mode=%X\r\n", regs->pt_mode); 29 pr_info(" r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n", 30 regs->r1, regs->r2, regs->r3, regs->r4); 31 pr_info(" r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n", 32 regs->r5, regs->r6, regs->r7, regs->r8); 33 pr_info(" r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n", 34 regs->r9, regs->r10, regs->r11, regs->r12); 35 pr_info(" r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n", 36 regs->r13, regs->r14, regs->r15, regs->r16); 37 pr_info(" r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n", 38 regs->r17, regs->r18, regs->r19, regs->r20); 39 pr_info(" r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n", 40 regs->r21, regs->r22, regs->r23, regs->r24); 41 pr_info(" r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n", 42 regs->r25, regs->r26, regs->r27, regs->r28); 43 pr_info(" r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n", 44 regs->r29, regs->r30, regs->r31, regs->pc); 45 pr_info(" msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n", 46 regs->msr, regs->ear, regs->esr, regs->fsr); 47 } 48 49 void (*pm_power_off)(void) = NULL; 50 EXPORT_SYMBOL(pm_power_off); 51 52 void flush_thread(void) 53 { 54 } 55 56 int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, 57 struct task_struct *p, unsigned long tls) 58 { 59 struct pt_regs *childregs = task_pt_regs(p); 60 struct thread_info *ti = task_thread_info(p); 61 62 if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { 63 /* if we're creating a new kernel thread then just zeroing all 64 * the registers. That's OK for a brand new thread.*/ 65 memset(childregs, 0, sizeof(struct pt_regs)); 66 memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); 67 ti->cpu_context.r1 = (unsigned long)childregs; 68 ti->cpu_context.r20 = (unsigned long)usp; /* fn */ 69 ti->cpu_context.r19 = (unsigned long)arg; 70 childregs->pt_mode = 1; 71 local_save_flags(childregs->msr); 72 ti->cpu_context.msr = childregs->msr & ~MSR_IE; 73 ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; 74 return 0; 75 } 76 *childregs = *current_pt_regs(); 77 if (usp) 78 childregs->r1 = usp; 79 80 memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); 81 ti->cpu_context.r1 = (unsigned long)childregs; 82 childregs->msr |= MSR_UMS; 83 84 /* we should consider the fact that childregs is a copy of the parent 85 * regs which were saved immediately after entering the kernel state 86 * before enabling VM. This MSR will be restored in switch_to and 87 * RETURN() and we want to have the right machine state there 88 * specifically this state must have INTs disabled before and enabled 89 * after performing rtbd 90 * compose the right MSR for RETURN(). It will work for switch_to also 91 * excepting for VM and UMS 92 * don't touch UMS , CARRY and cache bits 93 * right now MSR is a copy of parent one */ 94 childregs->msr &= ~MSR_EIP; 95 childregs->msr |= MSR_IE; 96 childregs->msr &= ~MSR_VM; 97 childregs->msr |= MSR_VMS; 98 childregs->msr |= MSR_EE; /* exceptions will be enabled*/ 99 100 ti->cpu_context.msr = (childregs->msr|MSR_VM); 101 ti->cpu_context.msr &= ~MSR_UMS; /* switch_to to kernel mode */ 102 ti->cpu_context.msr &= ~MSR_IE; 103 ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8; 104 105 /* 106 * r21 is the thread reg, r10 is 6th arg to clone 107 * which contains TLS area 108 */ 109 if (clone_flags & CLONE_SETTLS) 110 childregs->r21 = tls; 111 112 return 0; 113 } 114 115 unsigned long __get_wchan(struct task_struct *p) 116 { 117 /* TBD (used by procfs) */ 118 return 0; 119 } 120 121 /* Set up a thread for executing a new program */ 122 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) 123 { 124 regs->pc = pc; 125 regs->r1 = usp; 126 regs->pt_mode = 0; 127 regs->msr |= MSR_UMS; 128 regs->msr &= ~MSR_VM; 129 } 130 131 #include <linux/elfcore.h> 132 /* 133 * Set up a thread for executing a new program 134 */ 135 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs) 136 { 137 return 0; /* MicroBlaze has no separate FPU registers */ 138 } 139 140 void arch_cpu_idle(void) 141 { 142 raw_local_irq_enable(); 143 } 144