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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68knommu/kernel/process.c
downloadlinux-2.6.34-ux500-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m68knommu/kernel/process.c')
-rw-r--r--arch/m68knommu/kernel/process.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/arch/m68knommu/kernel/process.c b/arch/m68knommu/kernel/process.c
new file mode 100644
index 00000000000..2b6c9d32b7a
--- /dev/null
+++ b/arch/m68knommu/kernel/process.c
@@ -0,0 +1,442 @@
+/*
+ * linux/arch/m68knommu/kernel/process.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ *
+ * 68060 fixes by Jesper Skov
+ *
+ * uClinux changes
+ * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com>
+ */
+
+/*
+ * This file handles the architecture-dependent parts of process handling..
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/setup.h>
+#include <asm/pgtable.h>
+
+asmlinkage void ret_from_fork(void);
+
+
+/*
+ * The idle loop on an m68knommu..
+ */
+void default_idle(void)
+{
+ while(1) {
+ if (need_resched())
+ __asm__("stop #0x2000" : : : "cc");
+ schedule();
+ }
+}
+
+void (*idle)(void) = default_idle;
+
+/*
+ * The idle thread. There's no useful work to be
+ * done, so just try to conserve power and have a
+ * low exit latency (ie sit in a loop waiting for
+ * somebody to say that they'd like to reschedule)
+ */
+void cpu_idle(void)
+{
+ /* endless idle loop with no priority at all */
+ idle();
+}
+
+void machine_restart(char * __unused)
+{
+ if (mach_reset)
+ mach_reset();
+ for (;;);
+}
+
+EXPORT_SYMBOL(machine_restart);
+
+void machine_halt(void)
+{
+ if (mach_halt)
+ mach_halt();
+ for (;;);
+}
+
+EXPORT_SYMBOL(machine_halt);
+
+void machine_power_off(void)
+{
+ if (mach_power_off)
+ mach_power_off();
+ for (;;);
+}
+
+EXPORT_SYMBOL(machine_power_off);
+
+void show_regs(struct pt_regs * regs)
+{
+ printk(KERN_NOTICE "\n");
+ printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
+ regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
+ printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
+ regs->orig_d0, regs->d0, regs->a2, regs->a1);
+ printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
+ regs->a0, regs->d5, regs->d4);
+ printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
+ regs->d3, regs->d2, regs->d1);
+ if (!(regs->sr & PS_S))
+ printk(KERN_NOTICE "USP: %08lx\n", rdusp());
+}
+
+/*
+ * Create a kernel thread
+ */
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+ int retval;
+ long clone_arg = flags | CLONE_VM;
+ mm_segment_t fs;
+
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+
+ __asm__ __volatile__ (
+ "movel %%sp, %%d2\n\t"
+ "movel %5, %%d1\n\t"
+ "movel %1, %%d0\n\t"
+ "trap #0\n\t"
+ "cmpl %%sp, %%d2\n\t"
+ "jeq 1f\n\t"
+ "movel %3, %%sp@-\n\t"
+ "jsr %4@\n\t"
+ "movel %2, %%d0\n\t"
+ "trap #0\n"
+ "1:\n\t"
+ "movel %%d0, %0\n"
+ : "=d" (retval)
+ : "i" (__NR_clone),
+ "i" (__NR_exit),
+ "a" (arg),
+ "a" (fn),
+ "a" (clone_arg)
+ : "cc", "%d0", "%d1", "%d2");
+
+ set_fs(fs);
+ return retval;
+}
+
+void flush_thread(void)
+{
+#ifdef CONFIG_FPU
+ unsigned long zero = 0;
+#endif
+ set_fs(USER_DS);
+ current->thread.fs = __USER_DS;
+#ifdef CONFIG_FPU
+ if (!FPU_IS_EMU)
+ asm volatile (".chip 68k/68881\n\t"
+ "frestore %0@\n\t"
+ ".chip 68k" : : "a" (&zero));
+#endif
+}
+
+/*
+ * "m68k_fork()".. By the time we get here, the
+ * non-volatile registers have also been saved on the
+ * stack. We do some ugly pointer stuff here.. (see
+ * also copy_thread)
+ */
+
+asmlinkage int m68k_fork(struct pt_regs *regs)
+{
+ /* fork almost works, enough to trick you into looking elsewhere :-( */
+ return(-EINVAL);
+}
+
+asmlinkage int m68k_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
+}
+
+asmlinkage int m68k_clone(struct pt_regs *regs)
+{
+ unsigned long clone_flags;
+ unsigned long newsp;
+
+ /* syscall2 puts clone_flags in d1 and usp in d2 */
+ clone_flags = regs->d1;
+ newsp = regs->d2;
+ if (!newsp)
+ newsp = rdusp();
+ return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
+int copy_thread(int nr, unsigned long clone_flags,
+ unsigned long usp, unsigned long topstk,
+ struct task_struct * p, struct pt_regs * regs)
+{
+ struct pt_regs * childregs;
+ struct switch_stack * childstack, *stack;
+ unsigned long stack_offset, *retp;
+
+ stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
+ childregs = (struct pt_regs *) ((unsigned long) p->thread_info + stack_offset);
+
+ *childregs = *regs;
+ childregs->d0 = 0;
+
+ retp = ((unsigned long *) regs);
+ stack = ((struct switch_stack *) retp) - 1;
+
+ childstack = ((struct switch_stack *) childregs) - 1;
+ *childstack = *stack;
+ childstack->retpc = (unsigned long)ret_from_fork;
+
+ p->thread.usp = usp;
+ p->thread.ksp = (unsigned long)childstack;
+ /*
+ * Must save the current SFC/DFC value, NOT the value when
+ * the parent was last descheduled - RGH 10-08-96
+ */
+ p->thread.fs = get_fs().seg;
+
+#ifdef CONFIG_FPU
+ if (!FPU_IS_EMU) {
+ /* Copy the current fpu state */
+ asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
+
+ if (p->thread.fpstate[0])
+ asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
+ "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
+ : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
+ : "memory");
+ /* Restore the state in case the fpu was busy */
+ asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
+ }
+#endif
+
+ return 0;
+}
+
+/* Fill in the fpu structure for a core dump. */
+
+int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
+{
+#ifdef CONFIG_FPU
+ char fpustate[216];
+
+ if (FPU_IS_EMU) {
+ int i;
+
+ memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
+ memcpy(fpu->fpregs, current->thread.fp, 96);
+ /* Convert internal fpu reg representation
+ * into long double format
+ */
+ for (i = 0; i < 24; i += 3)
+ fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
+ ((fpu->fpregs[i] & 0x0000ffff) << 16);
+ return 1;
+ }
+
+ /* First dump the fpu context to avoid protocol violation. */
+ asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
+ if (!fpustate[0])
+ return 0;
+
+ asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
+ :: "m" (fpu->fpcntl[0])
+ : "memory");
+ asm volatile ("fmovemx %/fp0-%/fp7,%0"
+ :: "m" (fpu->fpregs[0])
+ : "memory");
+#endif
+ return 1;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs * regs, struct user * dump)
+{
+ struct switch_stack *sw;
+
+ /* changed the size calculations - should hopefully work better. lbt */
+ dump->magic = CMAGIC;
+ dump->start_code = 0;
+ dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
+ dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
+ dump->u_dsize = ((unsigned long) (current->mm->brk +
+ (PAGE_SIZE-1))) >> PAGE_SHIFT;
+ dump->u_dsize -= dump->u_tsize;
+ dump->u_ssize = 0;
+
+ if (dump->start_stack < TASK_SIZE)
+ dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
+
+ dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
+ sw = ((struct switch_stack *)regs) - 1;
+ dump->regs.d1 = regs->d1;
+ dump->regs.d2 = regs->d2;
+ dump->regs.d3 = regs->d3;
+ dump->regs.d4 = regs->d4;
+ dump->regs.d5 = regs->d5;
+ dump->regs.d6 = sw->d6;
+ dump->regs.d7 = sw->d7;
+ dump->regs.a0 = regs->a0;
+ dump->regs.a1 = regs->a1;
+ dump->regs.a2 = regs->a2;
+ dump->regs.a3 = sw->a3;
+ dump->regs.a4 = sw->a4;
+ dump->regs.a5 = sw->a5;
+ dump->regs.a6 = sw->a6;
+ dump->regs.d0 = regs->d0;
+ dump->regs.orig_d0 = regs->orig_d0;
+ dump->regs.stkadj = regs->stkadj;
+ dump->regs.sr = regs->sr;
+ dump->regs.pc = regs->pc;
+ dump->regs.fmtvec = (regs->format << 12) | regs->vector;
+ /* dump floating point stuff */
+ dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
+}
+
+/*
+ * Generic dumping code. Used for panic and debug.
+ */
+void dump(struct pt_regs *fp)
+{
+ unsigned long *sp;
+ unsigned char *tp;
+ int i;
+
+ printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
+ printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
+
+ if (current->mm) {
+ printk(KERN_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);
+ printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
+ (int) current->mm->start_stack,
+ (int)(((unsigned long) current) + THREAD_SIZE));
+ }
+
+ printk(KERN_EMERG "PC: %08lx\n", fp->pc);
+ printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
+ printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
+ fp->d0, fp->d1, fp->d2, fp->d3);
+ printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
+ fp->d4, fp->d5, fp->a0, fp->a1);
+ printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %08x\n", (unsigned int) rdusp(),
+ (unsigned int) fp);
+
+ printk(KERN_EMERG "\nCODE:");
+ tp = ((unsigned char *) fp->pc) - 0x20;
+ for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
+ if ((i % 0x10) == 0)
+ printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
+ printk(KERN_EMERG "%08x ", (int) *sp++);
+ }
+ printk(KERN_EMERG "\n");
+
+ printk(KERN_EMERG "\nKERNEL STACK:");
+ tp = ((unsigned char *) fp) - 0x40;
+ for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
+ if ((i % 0x10) == 0)
+ printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
+ printk(KERN_EMERG "%08x ", (int) *sp++);
+ }
+ printk(KERN_EMERG "\n");
+ printk(KERN_EMERG "\n");
+
+ printk(KERN_EMERG "\nUSER STACK:");
+ tp = (unsigned char *) (rdusp() - 0x10);
+ for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
+ if ((i % 0x10) == 0)
+ printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
+ printk(KERN_EMERG "%08x ", (int) *sp++);
+ }
+ printk(KERN_EMERG "\n\n");
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+asmlinkage int sys_execve(char *name, char **argv, char **envp)
+{
+ int error;
+ char * filename;
+ struct pt_regs *regs = (struct pt_regs *) &name;
+
+ lock_kernel();
+ filename = getname(name);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename, argv, envp, regs);
+ putname(filename);
+out:
+ unlock_kernel();
+ return error;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+ unsigned long fp, pc;
+ unsigned long stack_page;
+ int count = 0;
+ if (!p || p == current || p->state == TASK_RUNNING)
+ return 0;
+
+ stack_page = (unsigned long)p;
+ fp = ((struct switch_stack *)p->thread.ksp)->a6;
+ do {
+ if (fp < stack_page+sizeof(struct thread_info) ||
+ fp >= 8184+stack_page)
+ return 0;
+ pc = ((unsigned long *)fp)[1];
+ if (!in_sched_functions(pc))
+ return pc;
+ fp = *(unsigned long *) fp;
+ } while (count++ < 16);
+ return 0;
+}
+
+/*
+ * Return saved PC of a blocked thread.
+ */
+unsigned long thread_saved_pc(struct task_struct *tsk)
+{
+ struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
+
+ /* Check whether the thread is blocked in resume() */
+ if (in_sched_functions(sw->retpc))
+ return ((unsigned long *)sw->a6)[1];
+ else
+ return sw->retpc;
+}
+