1 /* 2 * Architecture-dependent parts of process handling. 3 * 4 * Copyright (C) 2013 Altera Corporation 5 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> 6 * Copyright (C) 2009 Wind River Systems Inc 7 * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com 8 * Copyright (C) 2004 Microtronix Datacom Ltd 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file "COPYING" in the main directory of this archive 12 * for more details. 13 */ 14 15 #include <linux/export.h> 16 #include <linux/sched.h> 17 #include <linux/sched/debug.h> 18 #include <linux/sched/task.h> 19 #include <linux/sched/task_stack.h> 20 #include <linux/mm_types.h> 21 #include <linux/tick.h> 22 #include <linux/uaccess.h> 23 24 #include <asm/unistd.h> 25 #include <asm/traps.h> 26 #include <asm/cpuinfo.h> 27 28 asmlinkage void ret_from_fork(void); 29 asmlinkage void ret_from_kernel_thread(void); 30 31 void (*pm_power_off)(void) = NULL; 32 EXPORT_SYMBOL(pm_power_off); 33 34 void arch_cpu_idle(void) 35 { 36 raw_local_irq_enable(); 37 } 38 39 /* 40 * The development boards have no way to pull a board reset. Just jump to the 41 * cpu reset address and let the boot loader or the code in head.S take care of 42 * resetting peripherals. 43 */ 44 void machine_restart(char *__unused) 45 { 46 pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr); 47 local_irq_disable(); 48 __asm__ __volatile__ ( 49 "jmp %0\n\t" 50 : 51 : "r" (cpuinfo.reset_addr) 52 : "r4"); 53 } 54 55 void machine_halt(void) 56 { 57 pr_notice("Machine halt...\n"); 58 local_irq_disable(); 59 for (;;) 60 ; 61 } 62 63 /* 64 * There is no way to power off the development boards. So just spin for now. If 65 * we ever have a way of resetting a board using a GPIO we should add that here. 66 */ 67 void machine_power_off(void) 68 { 69 pr_notice("Machine power off...\n"); 70 local_irq_disable(); 71 for (;;) 72 ; 73 } 74 75 void show_regs(struct pt_regs *regs) 76 { 77 pr_notice("\n"); 78 show_regs_print_info(KERN_DEFAULT); 79 80 pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n", 81 regs->r1, regs->r2, regs->r3, regs->r4); 82 83 pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n", 84 regs->r5, regs->r6, regs->r7, regs->r8); 85 86 pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n", 87 regs->r9, regs->r10, regs->r11, regs->r12); 88 89 pr_notice("r13: %08lx r14: %08lx r15: %08lx\n", 90 regs->r13, regs->r14, regs->r15); 91 92 pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n", 93 regs->ra, regs->fp, regs->sp, regs->gp); 94 95 pr_notice("ea: %08lx estatus: %08lx\n", 96 regs->ea, regs->estatus); 97 } 98 99 void flush_thread(void) 100 { 101 } 102 103 int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, 104 struct task_struct *p, unsigned long tls) 105 { 106 struct pt_regs *childregs = task_pt_regs(p); 107 struct pt_regs *regs; 108 struct switch_stack *stack; 109 struct switch_stack *childstack = 110 ((struct switch_stack *)childregs) - 1; 111 112 if (unlikely(p->flags & PF_KTHREAD)) { 113 memset(childstack, 0, 114 sizeof(struct switch_stack) + sizeof(struct pt_regs)); 115 116 childstack->r16 = usp; /* fn */ 117 childstack->r17 = arg; 118 childstack->ra = (unsigned long) ret_from_kernel_thread; 119 childregs->estatus = STATUS_PIE; 120 childregs->sp = (unsigned long) childstack; 121 122 p->thread.ksp = (unsigned long) childstack; 123 p->thread.kregs = childregs; 124 return 0; 125 } 126 127 regs = current_pt_regs(); 128 *childregs = *regs; 129 childregs->r2 = 0; /* Set the return value for the child. */ 130 childregs->r7 = 0; 131 132 stack = ((struct switch_stack *) regs) - 1; 133 *childstack = *stack; 134 childstack->ra = (unsigned long)ret_from_fork; 135 p->thread.kregs = childregs; 136 p->thread.ksp = (unsigned long) childstack; 137 138 if (usp) 139 childregs->sp = usp; 140 141 /* Initialize tls register. */ 142 if (clone_flags & CLONE_SETTLS) 143 childstack->r23 = tls; 144 145 return 0; 146 } 147 148 /* 149 * Generic dumping code. Used for panic and debug. 150 */ 151 void dump(struct pt_regs *fp) 152 { 153 unsigned long *sp; 154 unsigned char *tp; 155 int i; 156 157 pr_emerg("\nCURRENT PROCESS:\n\n"); 158 pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid); 159 160 if (current->mm) { 161 pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n", 162 (int) current->mm->start_code, 163 (int) current->mm->end_code, 164 (int) current->mm->start_data, 165 (int) current->mm->end_data, 166 (int) current->mm->end_data, 167 (int) current->mm->brk); 168 pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n", 169 (int) current->mm->start_stack, 170 (int)(((unsigned long) current) + THREAD_SIZE)); 171 } 172 173 pr_emerg("PC: %08lx\n", fp->ea); 174 pr_emerg("SR: %08lx SP: %08lx\n", 175 (long) fp->estatus, (long) fp); 176 177 pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n", 178 fp->r1, fp->r2, fp->r3); 179 180 pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", 181 fp->r4, fp->r5, fp->r6, fp->r7); 182 pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", 183 fp->r8, fp->r9, fp->r10, fp->r11); 184 pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n", 185 fp->r12, fp->r13, fp->r14, fp->r15); 186 pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n", 187 fp->orig_r2, fp->ra, fp->fp, fp->sp); 188 pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n", 189 (unsigned int) fp->sp, (unsigned int) fp); 190 191 pr_emerg("\nCODE:"); 192 tp = ((unsigned char *) fp->ea) - 0x20; 193 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { 194 if ((i % 0x10) == 0) 195 pr_emerg("\n%08x: ", (int) (tp + i)); 196 pr_emerg("%08x ", (int) *sp++); 197 } 198 pr_emerg("\n"); 199 200 pr_emerg("\nKERNEL STACK:"); 201 tp = ((unsigned char *) fp) - 0x40; 202 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { 203 if ((i % 0x10) == 0) 204 pr_emerg("\n%08x: ", (int) (tp + i)); 205 pr_emerg("%08x ", (int) *sp++); 206 } 207 pr_emerg("\n"); 208 pr_emerg("\n"); 209 210 pr_emerg("\nUSER STACK:"); 211 tp = (unsigned char *) (fp->sp - 0x10); 212 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) { 213 if ((i % 0x10) == 0) 214 pr_emerg("\n%08x: ", (int) (tp + i)); 215 pr_emerg("%08x ", (int) *sp++); 216 } 217 pr_emerg("\n\n"); 218 } 219 220 unsigned long get_wchan(struct task_struct *p) 221 { 222 unsigned long fp, pc; 223 unsigned long stack_page; 224 int count = 0; 225 226 if (!p || p == current || p->state == TASK_RUNNING) 227 return 0; 228 229 stack_page = (unsigned long)p; 230 fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */ 231 do { 232 if (fp < stack_page+sizeof(struct task_struct) || 233 fp >= 8184+stack_page) /* ;dgt2;tmp */ 234 return 0; 235 pc = ((unsigned long *)fp)[1]; 236 if (!in_sched_functions(pc)) 237 return pc; 238 fp = *(unsigned long *) fp; 239 } while (count++ < 16); /* ;dgt2;tmp */ 240 return 0; 241 } 242 243 /* 244 * Do necessary setup to start up a newly executed thread. 245 * Will startup in user mode (status_extension = 0). 246 */ 247 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) 248 { 249 memset((void *) regs, 0, sizeof(struct pt_regs)); 250 regs->estatus = ESTATUS_EPIE | ESTATUS_EU; 251 regs->ea = pc; 252 regs->sp = sp; 253 } 254 255 asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp, 256 int __user *parent_tidptr, int __user *child_tidptr, 257 unsigned long tls) 258 { 259 struct kernel_clone_args args = { 260 .flags = (lower_32_bits(clone_flags) & ~CSIGNAL), 261 .pidfd = parent_tidptr, 262 .child_tid = child_tidptr, 263 .parent_tid = parent_tidptr, 264 .exit_signal = (lower_32_bits(clone_flags) & CSIGNAL), 265 .stack = newsp, 266 .tls = tls, 267 }; 268 269 return kernel_clone(&args); 270 } 271