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