/*
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/*
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* linux/arch/m68k/kernel/process.c
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* linux/arch/m68k/kernel/process.c
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*
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*
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* Copyright (C) 1995 Hamish Macdonald
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* Copyright (C) 1995 Hamish Macdonald
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*/
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*/
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/*
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/*
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* This file handles the architecture-dependent parts of process handling..
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* This file handles the architecture-dependent parts of process handling..
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*/
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*/
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/ptrace.h>
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#include <linux/malloc.h>
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#include <linux/malloc.h>
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#include <linux/user.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/a.out.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/traps.h>
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#include <asm/traps.h>
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#include <asm/machdep.h>
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#include <asm/machdep.h>
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asmlinkage void ret_from_exception(void);
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asmlinkage void ret_from_exception(void);
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/*
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/*
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* The idle loop on an m68k..
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* The idle loop on an m68k..
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*/
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*/
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asmlinkage int sys_idle(void)
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asmlinkage int sys_idle(void)
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{
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{
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if (current->pid != 0)
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if (current->pid != 0)
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return -EPERM;
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return -EPERM;
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/* endless idle loop with no priority at all */
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/* endless idle loop with no priority at all */
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current->counter = -100;
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current->counter = -100;
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for (;;)
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for (;;)
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schedule();
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schedule();
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}
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}
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void hard_reset_now(void)
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void hard_reset_now(void)
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{
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{
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if (mach_reset)
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if (mach_reset)
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mach_reset();
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mach_reset();
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}
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}
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void show_regs(struct pt_regs * regs)
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void show_regs(struct pt_regs * regs)
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{
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{
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printk("\n");
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printk("\n");
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printk("Format %02x Vector: %04x PC: %08lx Status: %04x\n",
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printk("Format %02x Vector: %04x PC: %08lx Status: %04x\n",
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regs->format, regs->vector, regs->pc, regs->sr);
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regs->format, regs->vector, regs->pc, regs->sr);
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printk("ORIG_D0: %08lx D0: %08lx A1: %08lx\n",
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printk("ORIG_D0: %08lx D0: %08lx A1: %08lx\n",
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regs->orig_d0, regs->d0, regs->a1);
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regs->orig_d0, regs->d0, regs->a1);
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printk("A0: %08lx D5: %08lx D4: %08lx\n",
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printk("A0: %08lx D5: %08lx D4: %08lx\n",
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regs->a0, regs->d5, regs->d4);
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regs->a0, regs->d5, regs->d4);
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printk("D3: %08lx D2: %08lx D1: %08lx\n",
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printk("D3: %08lx D2: %08lx D1: %08lx\n",
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regs->d3, regs->d2, regs->d1);
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regs->d3, regs->d2, regs->d1);
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if (!(regs->sr & PS_S))
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if (!(regs->sr & PS_S))
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printk("USP: %08lx\n", rdusp());
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printk("USP: %08lx\n", rdusp());
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}
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}
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/*
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/*
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* Free current thread data structures etc..
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* Free current thread data structures etc..
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*/
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*/
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void exit_thread(void)
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void exit_thread(void)
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{
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{
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}
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}
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void flush_thread(void)
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void flush_thread(void)
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{
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{
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set_fs(USER_DS);
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set_fs(USER_DS);
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current->tss.fs = USER_DS;
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current->tss.fs = USER_DS;
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}
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}
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/*
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/*
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* "m68k_fork()".. By the time we get here, the
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* "m68k_fork()".. By the time we get here, the
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* non-volatile registers have also been saved on the
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* non-volatile registers have also been saved on the
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* stack. We do some ugly pointer stuff here.. (see
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* stack. We do some ugly pointer stuff here.. (see
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* also copy_thread)
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* also copy_thread)
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*/
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*/
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asmlinkage int m68k_fork(struct pt_regs *regs)
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asmlinkage int m68k_fork(struct pt_regs *regs)
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{
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{
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return do_fork(SIGCHLD, rdusp(), regs);
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return do_fork(SIGCHLD, rdusp(), regs);
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}
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}
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asmlinkage int m68k_clone(struct pt_regs *regs)
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asmlinkage int m68k_clone(struct pt_regs *regs)
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{
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{
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unsigned long clone_flags;
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unsigned long clone_flags;
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unsigned long newsp;
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unsigned long newsp;
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/* syscall2 puts clone_flags in d1 and usp in d2 */
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/* syscall2 puts clone_flags in d1 and usp in d2 */
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clone_flags = regs->d1;
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clone_flags = regs->d1;
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newsp = regs->d2;
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newsp = regs->d2;
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if (!newsp)
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if (!newsp)
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newsp = rdusp();
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newsp = rdusp();
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return do_fork(clone_flags, newsp, regs);
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return do_fork(clone_flags, newsp, regs);
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}
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}
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void release_thread(struct task_struct *dead_task)
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void release_thread(struct task_struct *dead_task)
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{
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{
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}
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}
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void copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
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void copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
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struct task_struct * p, struct pt_regs * regs)
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struct task_struct * p, struct pt_regs * regs)
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{
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{
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struct pt_regs * childregs;
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struct pt_regs * childregs;
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struct switch_stack * childstack, *stack;
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struct switch_stack * childstack, *stack;
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unsigned long stack_offset, *retp;
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unsigned long stack_offset, *retp;
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stack_offset = PAGE_SIZE - sizeof(struct pt_regs);
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stack_offset = PAGE_SIZE - sizeof(struct pt_regs);
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childregs = (struct pt_regs *) (p->kernel_stack_page + stack_offset);
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childregs = (struct pt_regs *) (p->kernel_stack_page + stack_offset);
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*childregs = *regs;
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*childregs = *regs;
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childregs->d0 = 0;
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childregs->d0 = 0;
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retp = ((unsigned long *) regs);
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retp = ((unsigned long *) regs);
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stack = ((struct switch_stack *) retp) - 1;
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stack = ((struct switch_stack *) retp) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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childstack = ((struct switch_stack *) childregs) - 1;
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*childstack = *stack;
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*childstack = *stack;
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childstack->retpc = (unsigned long) ret_from_exception;
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childstack->retpc = (unsigned long) ret_from_exception;
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p->tss.usp = usp;
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p->tss.usp = usp;
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p->tss.ksp = (unsigned long)childstack;
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p->tss.ksp = (unsigned long)childstack;
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/* Copy the current fpu state */
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/* Copy the current fpu state */
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asm volatile ("fsave %0" : : "m" (p->tss.fpstate[0]) : "memory");
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asm volatile ("fsave %0" : : "m" (p->tss.fpstate[0]) : "memory");
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if (p->tss.fpstate[0])
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if (p->tss.fpstate[0])
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asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
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asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
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"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
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"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
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: : "m" (p->tss.fp[0]), "m" (p->tss.fpcntl[0])
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: : "m" (p->tss.fp[0]), "m" (p->tss.fpcntl[0])
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: "memory");
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: "memory");
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/* Restore the state in case the fpu was busy */
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/* Restore the state in case the fpu was busy */
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asm volatile ("frestore %0" : : "m" (p->tss.fpstate[0]));
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asm volatile ("frestore %0" : : "m" (p->tss.fpstate[0]));
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}
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}
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/* Fill in the fpu structure for a core dump. */
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/* Fill in the fpu structure for a core dump. */
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int dump_fpu (struct user_m68kfp_struct *fpu)
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int dump_fpu (struct user_m68kfp_struct *fpu)
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{
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{
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char fpustate[216];
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char fpustate[216];
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/* First dump the fpu context to avoid protocol violation. */
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/* First dump the fpu context to avoid protocol violation. */
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asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
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asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
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if (!fpustate[0])
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if (!fpustate[0])
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return 0;
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return 0;
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
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:: "m" (fpu->fpcntl[0])
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:: "m" (fpu->fpcntl[0])
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: "memory");
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: "memory");
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asm volatile ("fmovemx %/fp0-%/fp7,%0"
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asm volatile ("fmovemx %/fp0-%/fp7,%0"
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:: "m" (fpu->fpregs[0])
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:: "m" (fpu->fpregs[0])
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: "memory");
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: "memory");
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return 1;
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return 1;
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}
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}
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/*
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/*
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* fill in the user structure for a core dump..
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* fill in the user structure for a core dump..
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*/
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*/
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void dump_thread(struct pt_regs * regs, struct user * dump)
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void dump_thread(struct pt_regs * regs, struct user * dump)
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{
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{
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/* changed the size calculations - should hopefully work better. lbt */
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/* changed the size calculations - should hopefully work better. lbt */
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dump->magic = CMAGIC;
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dump->magic = CMAGIC;
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dump->start_code = 0;
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dump->start_code = 0;
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dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
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dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
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dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
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dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
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dump->u_dsize = ((unsigned long) (current->mm->brk +
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dump->u_dsize = ((unsigned long) (current->mm->brk +
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(PAGE_SIZE-1))) >> PAGE_SHIFT;
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(PAGE_SIZE-1))) >> PAGE_SHIFT;
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dump->u_dsize -= dump->u_tsize;
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dump->u_dsize -= dump->u_tsize;
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dump->u_ssize = 0;
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dump->u_ssize = 0;
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if (dump->start_stack < TASK_SIZE)
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if (dump->start_stack < TASK_SIZE)
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dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
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dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
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dump->u_ar0 = (struct pt_regs *)(((int)(&dump->regs)) -((int)(dump)));
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dump->u_ar0 = (struct pt_regs *)(((int)(&dump->regs)) -((int)(dump)));
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dump->regs = *regs;
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dump->regs = *regs;
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dump->regs2 = ((struct switch_stack *)regs)[-1];
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dump->regs2 = ((struct switch_stack *)regs)[-1];
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/* dump floating point stuff */
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/* dump floating point stuff */
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dump->u_fpvalid = dump_fpu (&dump->m68kfp);
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dump->u_fpvalid = dump_fpu (&dump->m68kfp);
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}
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}
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/*
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/*
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* sys_execve() executes a new program.
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* sys_execve() executes a new program.
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*/
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*/
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asmlinkage int sys_execve(char *name, char **argv, char **envp)
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asmlinkage int sys_execve(char *name, char **argv, char **envp)
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{
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{
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int error;
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int error;
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char * filename;
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char * filename;
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struct pt_regs *regs = (struct pt_regs *) &name;
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struct pt_regs *regs = (struct pt_regs *) &name;
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error = getname(name, &filename);
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error = getname(name, &filename);
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if (error)
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if (error)
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return error;
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return error;
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error = do_execve(filename, argv, envp, regs);
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error = do_execve(filename, argv, envp, regs);
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putname(filename);
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putname(filename);
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return error;
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return error;
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}
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}
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