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 | |
| 25 | #include <linux/config.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/smp.h> |
| 32 | #include <linux/smp_lock.h> |
| 33 | #include <linux/stddef.h> |
| 34 | #include <linux/unistd.h> |
| 35 | #include <linux/ptrace.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/user.h> |
| 38 | #include <linux/a.out.h> |
| 39 | #include <linux/interrupt.h> |
| 40 | #include <linux/reboot.h> |
| 41 | |
| 42 | #include <asm/uaccess.h> |
| 43 | #include <asm/system.h> |
| 44 | #include <asm/traps.h> |
| 45 | #include <asm/setup.h> |
| 46 | #include <asm/pgtable.h> |
| 47 | |
| 48 | asmlinkage void ret_from_fork(void); |
| 49 | |
| 50 | /* |
| 51 | * The idle loop on an H8/300.. |
| 52 | */ |
| 53 | #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM) |
| 54 | void default_idle(void) |
| 55 | { |
| 56 | while(1) { |
Nick Piggin | 2e21495 | 2005-05-31 14:39:28 -0700 | [diff] [blame] | 57 | if (!need_resched()) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | local_irq_enable(); |
| 59 | __asm__("sleep"); |
| 60 | local_irq_disable(); |
| 61 | } |
| 62 | schedule(); |
| 63 | } |
| 64 | } |
| 65 | #else |
| 66 | void default_idle(void) |
| 67 | { |
| 68 | while(1) { |
| 69 | if (need_resched()) |
| 70 | schedule(); |
| 71 | } |
| 72 | } |
| 73 | #endif |
| 74 | void (*idle)(void) = default_idle; |
| 75 | |
| 76 | /* |
| 77 | * The idle thread. There's no useful work to be |
| 78 | * done, so just try to conserve power and have a |
| 79 | * low exit latency (ie sit in a loop waiting for |
| 80 | * somebody to say that they'd like to reschedule) |
| 81 | */ |
| 82 | void cpu_idle(void) |
| 83 | { |
| 84 | idle(); |
| 85 | } |
| 86 | |
| 87 | void machine_restart(char * __unused) |
| 88 | { |
| 89 | local_irq_disable(); |
| 90 | __asm__("jmp @@0"); |
| 91 | } |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | void machine_halt(void) |
| 94 | { |
| 95 | local_irq_disable(); |
| 96 | __asm__("sleep"); |
| 97 | for (;;); |
| 98 | } |
| 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | void machine_power_off(void) |
| 101 | { |
| 102 | local_irq_disable(); |
| 103 | __asm__("sleep"); |
| 104 | for (;;); |
| 105 | } |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | void show_regs(struct pt_regs * regs) |
| 108 | { |
| 109 | printk("\nPC: %08lx Status: %02x", |
| 110 | regs->pc, regs->ccr); |
| 111 | printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx", |
| 112 | regs->orig_er0, regs->er0, regs->er1); |
| 113 | printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx", |
| 114 | regs->er2, regs->er3, regs->er4, regs->er5); |
| 115 | printk("\nER6' %08lx ",regs->er6); |
| 116 | if (user_mode(regs)) |
| 117 | printk("USP: %08lx\n", rdusp()); |
| 118 | else |
| 119 | printk("\n"); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Create a kernel thread |
| 124 | */ |
| 125 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) |
| 126 | { |
| 127 | long retval; |
| 128 | long clone_arg; |
| 129 | mm_segment_t fs; |
| 130 | |
| 131 | fs = get_fs(); |
| 132 | set_fs (KERNEL_DS); |
| 133 | clone_arg = flags | CLONE_VM; |
| 134 | __asm__("mov.l sp,er3\n\t" |
| 135 | "sub.l er2,er2\n\t" |
| 136 | "mov.l %2,er1\n\t" |
| 137 | "mov.l %1,er0\n\t" |
| 138 | "trapa #0\n\t" |
| 139 | "cmp.l sp,er3\n\t" |
| 140 | "beq 1f\n\t" |
| 141 | "mov.l %4,er0\n\t" |
| 142 | "mov.l %3,er1\n\t" |
| 143 | "jsr @er1\n\t" |
| 144 | "mov.l %5,er0\n\t" |
| 145 | "trapa #0\n" |
| 146 | "1:\n\t" |
| 147 | "mov.l er0,%0" |
| 148 | :"=r"(retval) |
| 149 | :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit) |
| 150 | :"er0","er1","er2","er3"); |
| 151 | set_fs (fs); |
| 152 | return retval; |
| 153 | } |
| 154 | |
| 155 | void flush_thread(void) |
| 156 | { |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * "h8300_fork()".. By the time we get here, the |
| 161 | * non-volatile registers have also been saved on the |
| 162 | * stack. We do some ugly pointer stuff here.. (see |
| 163 | * also copy_thread) |
| 164 | */ |
| 165 | |
| 166 | asmlinkage int h8300_fork(struct pt_regs *regs) |
| 167 | { |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | asmlinkage int h8300_vfork(struct pt_regs *regs) |
| 172 | { |
| 173 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL); |
| 174 | } |
| 175 | |
| 176 | asmlinkage int h8300_clone(struct pt_regs *regs) |
| 177 | { |
| 178 | unsigned long clone_flags; |
| 179 | unsigned long newsp; |
| 180 | |
| 181 | /* syscall2 puts clone_flags in er1 and usp in er2 */ |
| 182 | clone_flags = regs->er1; |
| 183 | newsp = regs->er2; |
| 184 | if (!newsp) |
| 185 | newsp = rdusp(); |
| 186 | return do_fork(clone_flags, newsp, regs, 0, NULL, NULL); |
| 187 | |
| 188 | } |
| 189 | |
| 190 | int copy_thread(int nr, unsigned long clone_flags, |
| 191 | unsigned long usp, unsigned long topstk, |
| 192 | struct task_struct * p, struct pt_regs * regs) |
| 193 | { |
| 194 | struct pt_regs * childregs; |
| 195 | |
| 196 | childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1; |
| 197 | |
| 198 | *childregs = *regs; |
| 199 | childregs->retpc = (unsigned long) ret_from_fork; |
| 200 | childregs->er0 = 0; |
| 201 | |
| 202 | p->thread.usp = usp; |
| 203 | p->thread.ksp = (unsigned long)childregs; |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * fill in the user structure for a core dump.. |
| 210 | */ |
| 211 | void dump_thread(struct pt_regs * regs, struct user * dump) |
| 212 | { |
| 213 | /* changed the size calculations - should hopefully work better. lbt */ |
| 214 | dump->magic = CMAGIC; |
| 215 | dump->start_code = 0; |
| 216 | dump->start_stack = rdusp() & ~(PAGE_SIZE - 1); |
| 217 | dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; |
| 218 | dump->u_dsize = ((unsigned long) (current->mm->brk + |
| 219 | (PAGE_SIZE-1))) >> PAGE_SHIFT; |
| 220 | dump->u_dsize -= dump->u_tsize; |
| 221 | dump->u_ssize = 0; |
| 222 | |
| 223 | dump->u_ar0 = (struct user_regs_struct *)(((int)(&dump->regs)) -((int)(dump))); |
| 224 | dump->regs.er0 = regs->er0; |
| 225 | dump->regs.er1 = regs->er1; |
| 226 | dump->regs.er2 = regs->er2; |
| 227 | dump->regs.er3 = regs->er3; |
| 228 | dump->regs.er4 = regs->er4; |
| 229 | dump->regs.er5 = regs->er5; |
| 230 | dump->regs.er6 = regs->er6; |
| 231 | dump->regs.orig_er0 = regs->orig_er0; |
| 232 | dump->regs.ccr = regs->ccr; |
| 233 | dump->regs.pc = regs->pc; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * sys_execve() executes a new program. |
| 238 | */ |
| 239 | asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...) |
| 240 | { |
| 241 | int error; |
| 242 | char * filename; |
| 243 | struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4); |
| 244 | |
| 245 | lock_kernel(); |
| 246 | filename = getname(name); |
| 247 | error = PTR_ERR(filename); |
| 248 | if (IS_ERR(filename)) |
| 249 | goto out; |
| 250 | error = do_execve(filename, argv, envp, regs); |
| 251 | putname(filename); |
| 252 | out: |
| 253 | unlock_kernel(); |
| 254 | return error; |
| 255 | } |
| 256 | |
| 257 | unsigned long thread_saved_pc(struct task_struct *tsk) |
| 258 | { |
| 259 | return ((struct pt_regs *)tsk->thread.esp0)->pc; |
| 260 | } |
| 261 | |
| 262 | unsigned long get_wchan(struct task_struct *p) |
| 263 | { |
| 264 | unsigned long fp, pc; |
| 265 | unsigned long stack_page; |
| 266 | int count = 0; |
| 267 | if (!p || p == current || p->state == TASK_RUNNING) |
| 268 | return 0; |
| 269 | |
| 270 | stack_page = (unsigned long)p; |
| 271 | fp = ((struct pt_regs *)p->thread.ksp)->er6; |
| 272 | do { |
| 273 | if (fp < stack_page+sizeof(struct thread_info) || |
| 274 | fp >= 8184+stack_page) |
| 275 | return 0; |
| 276 | pc = ((unsigned long *)fp)[1]; |
| 277 | if (!in_sched_functions(pc)) |
| 278 | return pc; |
| 279 | fp = *(unsigned long *) fp; |
| 280 | } while (count++ < 16); |
| 281 | return 0; |
| 282 | } |