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Linux/arch/cris/arch-v32/kernel/process.c

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  1 /*
  2  *  Copyright (C) 2000-2003  Axis Communications AB
  3  *
  4  *  Authors:   Bjorn Wesen (bjornw@axis.com)
  5  *             Mikael Starvik (starvik@axis.com)
  6  *             Tobias Anderberg (tobiasa@axis.com), CRISv32 port.
  7  *
  8  * This file handles the architecture-dependent parts of process handling..
  9  */
 10 
 11 #include <linux/sched.h>
 12 #include <linux/slab.h>
 13 #include <linux/err.h>
 14 #include <linux/fs.h>
 15 #include <hwregs/reg_rdwr.h>
 16 #include <hwregs/reg_map.h>
 17 #include <hwregs/timer_defs.h>
 18 #include <hwregs/intr_vect_defs.h>
 19 
 20 extern void stop_watchdog(void);
 21 
 22 extern int cris_hlt_counter;
 23 
 24 /* We use this if we don't have any better idle routine. */
 25 void default_idle(void)
 26 {
 27         local_irq_disable();
 28         if (!need_resched() && !cris_hlt_counter) {
 29                 /* Halt until exception. */
 30                 __asm__ volatile("ei    \n\t"
 31                                  "halt      ");
 32         }
 33         local_irq_enable();
 34 }
 35 
 36 /*
 37  * Free current thread data structures etc..
 38  */
 39 
 40 extern void deconfigure_bp(long pid);
 41 void exit_thread(void)
 42 {
 43         deconfigure_bp(current->pid);
 44 }
 45 
 46 /*
 47  * If the watchdog is enabled, disable interrupts and enter an infinite loop.
 48  * The watchdog will reset the CPU after 0.1s. If the watchdog isn't enabled
 49  * then enable it and wait.
 50  */
 51 extern void arch_enable_nmi(void);
 52 
 53 void
 54 hard_reset_now(void)
 55 {
 56         /*
 57          * Don't declare this variable elsewhere.  We don't want any other
 58          * code to know about it than the watchdog handler in entry.S and
 59          * this code, implementing hard reset through the watchdog.
 60          */
 61 #if defined(CONFIG_ETRAX_WATCHDOG)
 62         extern int cause_of_death;
 63 #endif
 64 
 65         printk("*** HARD RESET ***\n");
 66         local_irq_disable();
 67 
 68 #if defined(CONFIG_ETRAX_WATCHDOG)
 69         cause_of_death = 0xbedead;
 70 #else
 71 {
 72         reg_timer_rw_wd_ctrl wd_ctrl = {0};
 73 
 74         stop_watchdog();
 75 
 76         wd_ctrl.key = 16;       /* Arbitrary key. */
 77         wd_ctrl.cnt = 1;        /* Minimum time. */
 78         wd_ctrl.cmd = regk_timer_start;
 79 
 80         arch_enable_nmi();
 81         REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl);
 82 }
 83 #endif
 84 
 85         while (1)
 86                 ; /* Wait for reset. */
 87 }
 88 
 89 /*
 90  * Return saved PC of a blocked thread.
 91  */
 92 unsigned long thread_saved_pc(struct task_struct *t)
 93 {
 94         return task_pt_regs(t)->erp;
 95 }
 96 
 97 static void
 98 kernel_thread_helper(void* dummy, int (*fn)(void *), void * arg)
 99 {
100         fn(arg);
101         do_exit(-1); /* Should never be called, return bad exit value. */
102 }
103 
104 /* Create a kernel thread. */
105 int
106 kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
107 {
108         struct pt_regs regs;
109 
110         memset(&regs, 0, sizeof(regs));
111 
112         /* Don't use r10 since that is set to 0 in copy_thread. */
113         regs.r11 = (unsigned long) fn;
114         regs.r12 = (unsigned long) arg;
115         regs.erp = (unsigned long) kernel_thread_helper;
116         regs.ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
117 
118         /* Create the new process. */
119         return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
120 }
121 
122 /*
123  * Setup the child's kernel stack with a pt_regs and call switch_stack() on it.
124  * It will be unnested during _resume and _ret_from_sys_call when the new thread
125  * is scheduled.
126  *
127  * Also setup the thread switching structure which is used to keep
128  * thread-specific data during _resumes.
129  */
130 
131 extern asmlinkage void ret_from_fork(void);
132 
133 int
134 copy_thread(unsigned long clone_flags, unsigned long usp,
135         unsigned long unused,
136         struct task_struct *p, struct pt_regs *regs)
137 {
138         struct pt_regs *childregs;
139         struct switch_stack *swstack;
140 
141         /*
142          * Put the pt_regs structure at the end of the new kernel stack page and
143          * fix it up. Note: the task_struct doubles as the kernel stack for the
144          * task.
145          */
146         childregs = task_pt_regs(p);
147         *childregs = *regs;     /* Struct copy of pt_regs. */
148         p->set_child_tid = p->clear_child_tid = NULL;
149         childregs->r10 = 0;     /* Child returns 0 after a fork/clone. */
150 
151         /* Set a new TLS ?
152          * The TLS is in $mof because it is the 5th argument to sys_clone.
153          */
154         if (p->mm && (clone_flags & CLONE_SETTLS)) {
155                 task_thread_info(p)->tls = regs->mof;
156         }
157 
158         /* Put the switch stack right below the pt_regs. */
159         swstack = ((struct switch_stack *) childregs) - 1;
160 
161         /* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */
162         swstack->r9 = 0;
163 
164         /*
165          * We want to return into ret_from_sys_call after the _resume.
166          * ret_from_fork will call ret_from_sys_call.
167          */
168         swstack->return_ip = (unsigned long) ret_from_fork;
169 
170         /* Fix the user-mode and kernel-mode stackpointer. */
171         p->thread.usp = usp;
172         p->thread.ksp = (unsigned long) swstack;
173 
174         return 0;
175 }
176 
177 /*
178  * Be aware of the "magic" 7th argument in the four system-calls below.
179  * They need the latest stackframe, which is put as the 7th argument by
180  * entry.S. The previous arguments are dummies or actually used, but need
181  * to be defined to reach the 7th argument.
182  *
183  * N.B.: Another method to get the stackframe is to use current_regs(). But
184  * it returns the latest stack-frame stacked when going from _user mode_ and
185  * some of these (at least sys_clone) are called from kernel-mode sometimes
186  * (for example during kernel_thread, above) and thus cannot use it. Thus,
187  * to be sure not to get any surprises, we use the method for the other calls
188  * as well.
189  */
190 asmlinkage int
191 sys_fork(long r10, long r11, long r12, long r13, long mof, long srp,
192         struct pt_regs *regs)
193 {
194         return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
195 }
196 
197 /* FIXME: Is parent_tid/child_tid really third/fourth argument? Update lib? */
198 asmlinkage int
199 sys_clone(unsigned long newusp, unsigned long flags, int *parent_tid, int *child_tid,
200         unsigned long tls, long srp, struct pt_regs *regs)
201 {
202         if (!newusp)
203                 newusp = rdusp();
204 
205         return do_fork(flags, newusp, regs, 0, parent_tid, child_tid);
206 }
207 
208 /*
209  * vfork is a system call in i386 because of register-pressure - maybe
210  * we can remove it and handle it in libc but we put it here until then.
211  */
212 asmlinkage int
213 sys_vfork(long r10, long r11, long r12, long r13, long mof, long srp,
214         struct pt_regs *regs)
215 {
216         return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
217 }
218 
219 /* sys_execve() executes a new program. */
220 asmlinkage int
221 sys_execve(const char *fname,
222            const char *const *argv,
223            const char *const *envp, long r13, long mof, long srp,
224            struct pt_regs *regs)
225 {
226         int error;
227         struct filename *filename;
228 
229         filename = getname(fname);
230         error = PTR_ERR(filename);
231 
232         if (IS_ERR(filename))
233                 goto out;
234 
235         error = do_execve(filename->name, argv, envp, regs);
236         putname(filename);
237  out:
238         return error;
239 }
240 
241 unsigned long
242 get_wchan(struct task_struct *p)
243 {
244         /* TODO */
245         return 0;
246 }
247 #undef last_sched
248 #undef first_sched
249 
250 void show_regs(struct pt_regs * regs)
251 {
252         unsigned long usp = rdusp();
253         printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
254                 regs->erp, regs->srp, regs->ccs, usp, regs->mof);
255 
256         printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
257                 regs->r0, regs->r1, regs->r2, regs->r3);
258 
259         printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
260                 regs->r4, regs->r5, regs->r6, regs->r7);
261 
262         printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
263                 regs->r8, regs->r9, regs->r10, regs->r11);
264 
265         printk("r12: %08lx r13: %08lx oR10: %08lx\n",
266                 regs->r12, regs->r13, regs->orig_r10);
267 }
268 

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