Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/h8300/kernel/process.c |
| 3 | * |
| 4 | * Yoshinori Sato <ysato@users.sourceforge.jp> |
| 5 | * |
| 6 | * Based on: |
| 7 | * |
| 8 | * linux/arch/m68knommu/kernel/process.c |
| 9 | * |
| 10 | * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, |
| 11 | * Kenneth Albanowski <kjahds@kjahds.com>, |
| 12 | * The Silver Hammer Group, Ltd. |
| 13 | * |
| 14 | * linux/arch/m68k/kernel/process.c |
| 15 | * |
| 16 | * Copyright (C) 1995 Hamish Macdonald |
| 17 | * |
| 18 | * 68060 fixes by Jesper Skov |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * This file handles the architecture-dependent parts of process handling.. |
| 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/errno.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/stddef.h> |
| 32 | #include <linux/unistd.h> |
| 33 | #include <linux/ptrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/user.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/reboot.h> |
Yoshinori Sato | 0cd82ef | 2007-08-22 14:01:24 -0700 | [diff] [blame] | 37 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 38 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #include <asm/uaccess.h> |
| 41 | #include <asm/system.h> |
| 42 | #include <asm/traps.h> |
| 43 | #include <asm/setup.h> |
| 44 | #include <asm/pgtable.h> |
| 45 | |
Adrian Bunk | 47f3fc9 | 2006-03-06 15:42:47 -0800 | [diff] [blame] | 46 | void (*pm_power_off)(void) = NULL; |
| 47 | EXPORT_SYMBOL(pm_power_off); |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | asmlinkage void ret_from_fork(void); |
| 50 | |
| 51 | /* |
| 52 | * The idle loop on an H8/300.. |
| 53 | */ |
| 54 | #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM) |
Adrian Bunk | cdb0452 | 2006-03-24 03:15:57 -0800 | [diff] [blame] | 55 | static void default_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 57 | local_irq_disable(); |
| 58 | if (!need_resched()) { |
| 59 | local_irq_enable(); |
| 60 | /* XXX: race here! What if need_resched() gets set now? */ |
| 61 | __asm__("sleep"); |
| 62 | } else |
| 63 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } |
| 65 | #else |
Adrian Bunk | cdb0452 | 2006-03-24 03:15:57 -0800 | [diff] [blame] | 66 | static void default_idle(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 68 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | } |
| 70 | #endif |
| 71 | void (*idle)(void) = default_idle; |
| 72 | |
| 73 | /* |
| 74 | * The idle thread. There's no useful work to be |
| 75 | * done, so just try to conserve power and have a |
| 76 | * low exit latency (ie sit in a loop waiting for |
| 77 | * somebody to say that they'd like to reschedule) |
| 78 | */ |
| 79 | void cpu_idle(void) |
| 80 | { |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 81 | while (1) { |
| 82 | while (!need_resched()) |
| 83 | idle(); |
| 84 | preempt_enable_no_resched(); |
| 85 | schedule(); |
| 86 | preempt_disable(); |
| 87 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | void machine_restart(char * __unused) |
| 91 | { |
| 92 | local_irq_disable(); |
| 93 | __asm__("jmp @@0"); |
| 94 | } |
| 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | void machine_halt(void) |
| 97 | { |
| 98 | local_irq_disable(); |
| 99 | __asm__("sleep"); |
| 100 | for (;;); |
| 101 | } |
| 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | void machine_power_off(void) |
| 104 | { |
| 105 | local_irq_disable(); |
| 106 | __asm__("sleep"); |
| 107 | for (;;); |
| 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | void show_regs(struct pt_regs * regs) |
| 111 | { |
| 112 | printk("\nPC: %08lx Status: %02x", |
| 113 | regs->pc, regs->ccr); |
| 114 | printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx", |
| 115 | regs->orig_er0, regs->er0, regs->er1); |
| 116 | printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx", |
| 117 | regs->er2, regs->er3, regs->er4, regs->er5); |
| 118 | printk("\nER6' %08lx ",regs->er6); |
| 119 | if (user_mode(regs)) |
| 120 | printk("USP: %08lx\n", rdusp()); |
| 121 | else |
| 122 | printk("\n"); |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Create a kernel thread |
| 127 | */ |
| 128 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 129 | { |
| 130 | long retval; |
| 131 | long clone_arg; |
| 132 | mm_segment_t fs; |
| 133 | |
| 134 | fs = get_fs(); |
| 135 | set_fs (KERNEL_DS); |
| 136 | clone_arg = flags | CLONE_VM; |
| 137 | __asm__("mov.l sp,er3\n\t" |
| 138 | "sub.l er2,er2\n\t" |
| 139 | "mov.l %2,er1\n\t" |
| 140 | "mov.l %1,er0\n\t" |
| 141 | "trapa #0\n\t" |
| 142 | "cmp.l sp,er3\n\t" |
| 143 | "beq 1f\n\t" |
| 144 | "mov.l %4,er0\n\t" |
| 145 | "mov.l %3,er1\n\t" |
| 146 | "jsr @er1\n\t" |
| 147 | "mov.l %5,er0\n\t" |
| 148 | "trapa #0\n" |
| 149 | "1:\n\t" |
| 150 | "mov.l er0,%0" |
| 151 | :"=r"(retval) |
| 152 | :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit) |
| 153 | :"er0","er1","er2","er3"); |
| 154 | set_fs (fs); |
| 155 | return retval; |
| 156 | } |
| 157 | |
| 158 | void flush_thread(void) |
| 159 | { |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * "h8300_fork()".. By the time we get here, the |
| 164 | * non-volatile registers have also been saved on the |
| 165 | * stack. We do some ugly pointer stuff here.. (see |
| 166 | * also copy_thread) |
| 167 | */ |
| 168 | |
| 169 | asmlinkage int h8300_fork(struct pt_regs *regs) |
| 170 | { |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | |
| 174 | asmlinkage int h8300_vfork(struct pt_regs *regs) |
| 175 | { |
| 176 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL); |
| 177 | } |
| 178 | |
| 179 | asmlinkage int h8300_clone(struct pt_regs *regs) |
| 180 | { |
| 181 | unsigned long clone_flags; |
| 182 | unsigned long newsp; |
| 183 | |
| 184 | /* syscall2 puts clone_flags in er1 and usp in er2 */ |
| 185 | clone_flags = regs->er1; |
| 186 | newsp = regs->er2; |
| 187 | if (!newsp) |
| 188 | newsp = rdusp(); |
| 189 | return do_fork(clone_flags, newsp, regs, 0, NULL, NULL); |
| 190 | |
| 191 | } |
| 192 | |
Alexey Dobriyan | 6f2c55b | 2009-04-02 16:56:59 -0700 | [diff] [blame] | 193 | int copy_thread(unsigned long clone_flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | unsigned long usp, unsigned long topstk, |
| 195 | struct task_struct * p, struct pt_regs * regs) |
| 196 | { |
| 197 | struct pt_regs * childregs; |
| 198 | |
Al Viro | 68f8b1f | 2006-01-12 01:05:55 -0800 | [diff] [blame] | 199 | childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | *childregs = *regs; |
| 202 | childregs->retpc = (unsigned long) ret_from_fork; |
| 203 | childregs->er0 = 0; |
| 204 | |
| 205 | p->thread.usp = usp; |
| 206 | p->thread.ksp = (unsigned long)childregs; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | * sys_execve() executes a new program. |
| 213 | */ |
David Howells | d762746 | 2010-08-17 23:52:56 +0100 | [diff] [blame] | 214 | asmlinkage int sys_execve(const char *name, |
| 215 | const char *const *argv, |
| 216 | const char *const *envp, |
| 217 | int dummy, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | { |
| 219 | int error; |
| 220 | char * filename; |
| 221 | struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4); |
| 222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | filename = getname(name); |
| 224 | error = PTR_ERR(filename); |
| 225 | if (IS_ERR(filename)) |
John Kacur | e3c1a6b | 2009-10-12 23:04:11 +0200 | [diff] [blame] | 226 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | error = do_execve(filename, argv, envp, regs); |
| 228 | putname(filename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | return error; |
| 230 | } |
| 231 | |
| 232 | unsigned long thread_saved_pc(struct task_struct *tsk) |
| 233 | { |
| 234 | return ((struct pt_regs *)tsk->thread.esp0)->pc; |
| 235 | } |
| 236 | |
| 237 | unsigned long get_wchan(struct task_struct *p) |
| 238 | { |
| 239 | unsigned long fp, pc; |
| 240 | unsigned long stack_page; |
| 241 | int count = 0; |
| 242 | if (!p || p == current || p->state == TASK_RUNNING) |
| 243 | return 0; |
| 244 | |
| 245 | stack_page = (unsigned long)p; |
| 246 | fp = ((struct pt_regs *)p->thread.ksp)->er6; |
| 247 | do { |
| 248 | if (fp < stack_page+sizeof(struct thread_info) || |
| 249 | fp >= 8184+stack_page) |
| 250 | return 0; |
| 251 | pc = ((unsigned long *)fp)[1]; |
| 252 | if (!in_sched_functions(pc)) |
| 253 | return pc; |
| 254 | fp = *(unsigned long *) fp; |
| 255 | } while (count++ < 16); |
| 256 | return 0; |
| 257 | } |