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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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dd76279b47
Plugs in general and FPU regsets. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
492 lines
12 KiB
C
492 lines
12 KiB
C
/*
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* arch/sh/kernel/ptrace_64.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003 - 2008 Paul Mundt
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*
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* Started from SH3/4 version:
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* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
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*
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* Original x86 implementation:
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* By Ross Biro 1/23/92
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* edited by Linus Torvalds
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/regset.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/syscalls.h>
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#include <asm/fpu.h>
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/* This mask defines the bits of the SR which the user is not allowed to
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change, which are everything except S, Q, M, PR, SZ, FR. */
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#define SR_MASK (0xffff8cfd)
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* This routine will get a word from the user area in the process kernel stack.
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*/
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static inline int get_stack_long(struct task_struct *task, int offset)
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{
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unsigned char *stack;
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stack = (unsigned char *)(task->thread.uregs);
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stack += offset;
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return (*((int *)stack));
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}
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static inline unsigned long
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get_fpu_long(struct task_struct *task, unsigned long addr)
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{
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unsigned long tmp;
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struct pt_regs *regs;
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regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
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if (!tsk_used_math(task)) {
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if (addr == offsetof(struct user_fpu_struct, fpscr)) {
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tmp = FPSCR_INIT;
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} else {
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tmp = 0xffffffffUL; /* matches initial value in fpu.c */
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}
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return tmp;
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}
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if (last_task_used_math == task) {
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enable_fpu();
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save_fpu(task, regs);
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disable_fpu();
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last_task_used_math = 0;
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regs->sr |= SR_FD;
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}
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tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
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return tmp;
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}
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/*
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* This routine will put a word into the user area in the process kernel stack.
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*/
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static inline int put_stack_long(struct task_struct *task, int offset,
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unsigned long data)
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{
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unsigned char *stack;
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stack = (unsigned char *)(task->thread.uregs);
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stack += offset;
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*(unsigned long *) stack = data;
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return 0;
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}
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static inline int
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put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
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{
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struct pt_regs *regs;
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regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
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if (!tsk_used_math(task)) {
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fpinit(&task->thread.fpu.hard);
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set_stopped_child_used_math(task);
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} else if (last_task_used_math == task) {
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enable_fpu();
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save_fpu(task, regs);
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disable_fpu();
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last_task_used_math = 0;
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regs->sr |= SR_FD;
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}
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((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
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return 0;
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}
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void user_enable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = child->thread.uregs;
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regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
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}
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void user_disable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = child->thread.uregs;
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regs->sr &= ~SR_SSTEP;
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}
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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const struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* PC, SR, SYSCALL */
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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0, 3 * sizeof(unsigned long long));
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/* R1 -> R63 */
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs[0]),
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63 * sizeof(unsigned long long));
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/* TR0 -> TR7 */
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->tregs,
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offsetof(struct pt_regs, tregs[0]),
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8 * sizeof(unsigned long long));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* PC, SR, SYSCALL */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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0, 3 * sizeof(unsigned long long));
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/* R1 -> R63 */
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if (!ret && count > 0)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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offsetof(struct pt_regs, regs[0]),
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63 * sizeof(unsigned long long));
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/* TR0 -> TR7 */
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if (!ret && count > 0)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->tregs,
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offsetof(struct pt_regs, tregs[0]),
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8 * sizeof(unsigned long long));
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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#ifdef CONFIG_SH_FPU
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int fpregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.fpu.hard, 0, -1);
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}
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static int fpregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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set_stopped_child_used_math(target);
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.fpu.hard, 0, -1);
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}
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static int fpregs_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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return tsk_used_math(target) ? regset->n : 0;
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}
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#endif
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/*
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* These are our native regset flavours.
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*/
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enum sh_regset {
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REGSET_GENERAL,
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#ifdef CONFIG_SH_FPU
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REGSET_FPU,
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#endif
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};
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static const struct user_regset sh_regsets[] = {
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/*
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* Format is:
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* PC, SR, SYSCALL,
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* R1 --> R63,
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* TR0 --> TR7,
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(long long),
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.align = sizeof(long long),
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.get = genregs_get,
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.set = genregs_set,
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},
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#ifdef CONFIG_SH_FPU
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[REGSET_FPU] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fpu_struct) /
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sizeof(long long),
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.size = sizeof(long long),
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.align = sizeof(long long),
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.get = fpregs_get,
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.set = fpregs_set,
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.active = fpregs_active,
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},
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#endif
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};
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static const struct user_regset_view user_sh64_native_view = {
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.name = "sh64",
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.e_machine = EM_SH,
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.regsets = sh_regsets,
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.n = ARRAY_SIZE(sh_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_sh64_native_view;
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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int ret;
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switch (request) {
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/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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unsigned long tmp;
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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if (addr < sizeof(struct pt_regs))
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tmp = get_stack_long(child, addr);
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else if ((addr >= offsetof(struct user, fpu)) &&
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(addr < offsetof(struct user, u_fpvalid))) {
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tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
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} else if (addr == offsetof(struct user, u_fpvalid)) {
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tmp = !!tsk_used_math(child);
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} else {
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break;
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}
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ret = put_user(tmp, (unsigned long *)data);
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break;
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}
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case PTRACE_POKEUSR:
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/* write the word at location addr in the USER area. We must
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disallow any changes to certain SR bits or u_fpvalid, since
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this could crash the kernel or result in a security
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loophole. */
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ret = -EIO;
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if ((addr & 3) || addr < 0)
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break;
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if (addr < sizeof(struct pt_regs)) {
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/* Ignore change of top 32 bits of SR */
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if (addr == offsetof (struct pt_regs, sr)+4)
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{
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ret = 0;
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break;
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}
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/* If lower 32 bits of SR, ignore non-user bits */
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if (addr == offsetof (struct pt_regs, sr))
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{
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long cursr = get_stack_long(child, addr);
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data &= ~(SR_MASK);
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data |= (cursr & SR_MASK);
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}
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ret = put_stack_long(child, addr, data);
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}
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else if ((addr >= offsetof(struct user, fpu)) &&
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(addr < offsetof(struct user, u_fpvalid))) {
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ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
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}
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break;
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case PTRACE_GETREGS:
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return copy_regset_to_user(child, &user_sh64_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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(void __user *)data);
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case PTRACE_SETREGS:
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return copy_regset_from_user(child, &user_sh64_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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(const void __user *)data);
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#ifdef CONFIG_SH_FPU
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case PTRACE_GETFPREGS:
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return copy_regset_to_user(child, &user_sh64_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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(void __user *)data);
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case PTRACE_SETFPREGS:
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return copy_regset_from_user(child, &user_sh64_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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(const void __user *)data);
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#endif
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
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{
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#define WPC_DBRMODE 0x0d104008
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static int first_call = 1;
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lock_kernel();
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if (first_call) {
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/* Set WPC.DBRMODE to 0. This makes all debug events get
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* delivered through RESVEC, i.e. into the handlers in entry.S.
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* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
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* would normally be left set to 1, which makes debug events get
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* delivered through DBRVEC, i.e. into the remote gdb's
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* handlers. This prevents ptrace getting them, and confuses
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* the remote gdb.) */
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printk("DBRMODE set to 0 to permit native debugging\n");
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poke_real_address_q(WPC_DBRMODE, 0);
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first_call = 0;
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}
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unlock_kernel();
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return sys_ptrace(request, pid, addr, data);
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}
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static inline int audit_arch(void)
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{
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int arch = EM_SH;
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#ifdef CONFIG_64BIT
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arch |= __AUDIT_ARCH_64BIT;
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#endif
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
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{
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long long ret = 0;
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secure_computing(regs->regs[9]);
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if (test_thread_flag(TIF_SYSCALL_TRACE) &&
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tracehook_report_syscall_entry(regs))
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/*
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* Tracing decided this syscall should not happen.
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in regs->regs[0].
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*/
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ret = -1LL;
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if (unlikely(current->audit_context))
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audit_syscall_entry(audit_arch(), regs->regs[1],
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regs->regs[2], regs->regs[3],
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regs->regs[4], regs->regs[5]);
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return ret ?: regs->regs[9];
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}
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asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
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{
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if (unlikely(current->audit_context))
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audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
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regs->regs[9]);
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, 0);
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}
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/* Called with interrupts disabled */
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asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
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{
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/* This is called after a single step exception (DEBUGSS).
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There is no need to change the PC, as it is a post-execution
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exception, as entry.S does not do anything to the PC for DEBUGSS.
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We need to clear the Single Step setting in SR to avoid
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continually stepping. */
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local_irq_enable();
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regs->sr &= ~SR_SSTEP;
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force_sig(SIGTRAP, current);
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}
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/* Called with interrupts disabled */
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asmlinkage void do_software_break_point(unsigned long long vec,
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struct pt_regs *regs)
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{
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/* We need to forward step the PC, to counteract the backstep done
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in signal.c. */
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local_irq_enable();
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force_sig(SIGTRAP, current);
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regs->pc += 4;
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}
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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