449 lines
10 KiB
C
449 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* ptrace.c: Sparc process tracing support.
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*
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* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
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*
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* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
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* and David Mosberger.
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*
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* Added Linux support -miguel (weird, eh?, the original code was meant
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* to emulate SunOS).
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.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/smp.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <linux/regset.h>
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#include <linux/elf.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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#include "kernel.h"
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/* #define ALLOW_INIT_TRACING */
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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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/* nothing to do */
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}
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enum sparc_regset {
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REGSET_GENERAL,
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REGSET_FP,
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};
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static int regwindow32_get(struct task_struct *target,
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const struct pt_regs *regs,
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u32 *uregs)
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{
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unsigned long reg_window = regs->u_regs[UREG_I6];
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int size = 16 * sizeof(u32);
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if (target == current) {
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if (copy_from_user(uregs, (void __user *)reg_window, size))
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return -EFAULT;
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} else {
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if (access_process_vm(target, reg_window, uregs, size,
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FOLL_FORCE) != size)
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return -EFAULT;
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}
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return 0;
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}
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static int regwindow32_set(struct task_struct *target,
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const struct pt_regs *regs,
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u32 *uregs)
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{
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unsigned long reg_window = regs->u_regs[UREG_I6];
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int size = 16 * sizeof(u32);
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if (target == current) {
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if (copy_to_user((void __user *)reg_window, uregs, size))
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return -EFAULT;
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} else {
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if (access_process_vm(target, reg_window, uregs, size,
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FOLL_FORCE | FOLL_WRITE) != size)
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return -EFAULT;
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}
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return 0;
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}
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static int genregs32_get(struct task_struct *target,
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const struct user_regset *regset,
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struct membuf to)
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{
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const struct pt_regs *regs = target->thread.kregs;
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u32 uregs[16];
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if (target == current)
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flush_user_windows();
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membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
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if (!to.left)
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return 0;
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if (regwindow32_get(target, regs, uregs))
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return -EFAULT;
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membuf_write(&to, uregs, 16 * sizeof(u32));
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membuf_store(&to, regs->psr);
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membuf_store(&to, regs->pc);
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membuf_store(&to, regs->npc);
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membuf_store(&to, regs->y);
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return membuf_zero(&to, 2 * sizeof(u32));
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}
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static int genregs32_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 = target->thread.kregs;
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u32 uregs[16];
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u32 psr;
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int ret;
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if (target == current)
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flush_user_windows();
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->u_regs,
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0, 16 * sizeof(u32));
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if (ret || !count)
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return ret;
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if (regwindow32_get(target, regs, uregs))
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return -EFAULT;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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uregs,
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16 * sizeof(u32), 32 * sizeof(u32));
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if (ret)
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return ret;
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if (regwindow32_set(target, regs, uregs))
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return -EFAULT;
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if (!count)
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return 0;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&psr,
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32 * sizeof(u32), 33 * sizeof(u32));
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if (ret)
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return ret;
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regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
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(psr & (PSR_ICC | PSR_SYSCALL));
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if (!count)
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return 0;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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33 * sizeof(u32), 34 * sizeof(u32));
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if (ret || !count)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->npc,
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34 * sizeof(u32), 35 * sizeof(u32));
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if (ret || !count)
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return ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->y,
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35 * sizeof(u32), 36 * sizeof(u32));
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if (ret || !count)
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return ret;
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user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 36 * sizeof(u32),
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38 * sizeof(u32));
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return 0;
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}
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static int fpregs32_get(struct task_struct *target,
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const struct user_regset *regset,
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struct membuf to)
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{
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
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membuf_zero(&to, sizeof(u32));
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membuf_write(&to, &target->thread.fsr, sizeof(u32));
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membuf_store(&to, (u32)((1 << 8) | (8 << 16)));
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return membuf_zero(&to, 64 * sizeof(u32));
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}
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static int fpregs32_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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unsigned long *fpregs = target->thread.float_regs;
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int ret;
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 32 * sizeof(u32));
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if (!ret)
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user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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32 * sizeof(u32),
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33 * sizeof(u32));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.fsr,
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33 * sizeof(u32),
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34 * sizeof(u32));
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if (!ret)
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user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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34 * sizeof(u32), -1);
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return ret;
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}
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static const struct user_regset sparc32_regsets[] = {
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/* Format is:
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* G0 --> G7
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* O0 --> O7
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* L0 --> L7
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* I0 --> I7
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* PSR, PC, nPC, Y, WIM, TBR
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = 38,
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.size = sizeof(u32), .align = sizeof(u32),
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.regset_get = genregs32_get, .set = genregs32_set
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},
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/* Format is:
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* F0 --> F31
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* empty 32-bit word
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* FSR (32--bit word)
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* FPU QUEUE COUNT (8-bit char)
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* FPU QUEUE ENTRYSIZE (8-bit char)
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* FPU ENABLED (8-bit char)
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* empty 8-bit char
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* FPU QUEUE (64 32-bit ints)
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*/
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[REGSET_FP] = {
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.core_note_type = NT_PRFPREG,
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.n = 99,
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.size = sizeof(u32), .align = sizeof(u32),
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.regset_get = fpregs32_get, .set = fpregs32_set
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},
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};
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static int getregs_get(struct task_struct *target,
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const struct user_regset *regset,
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struct membuf to)
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{
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const struct pt_regs *regs = target->thread.kregs;
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if (target == current)
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flush_user_windows();
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membuf_store(&to, regs->psr);
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membuf_store(&to, regs->pc);
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membuf_store(&to, regs->npc);
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membuf_store(&to, regs->y);
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return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
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}
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static int setregs_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 = target->thread.kregs;
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u32 v[4];
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int ret;
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if (target == current)
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flush_user_windows();
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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v,
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0, 4 * sizeof(u32));
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if (ret)
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return ret;
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regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
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(v[0] & (PSR_ICC | PSR_SYSCALL));
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regs->pc = v[1];
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regs->npc = v[2];
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regs->y = v[3];
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->u_regs + 1,
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4 * sizeof(u32) , 19 * sizeof(u32));
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}
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static int getfpregs_get(struct task_struct *target,
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const struct user_regset *regset,
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struct membuf to)
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{
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
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membuf_write(&to, &target->thread.fsr, sizeof(u32));
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return membuf_zero(&to, 35 * sizeof(u32));
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}
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static int setfpregs_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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unsigned long *fpregs = target->thread.float_regs;
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int ret;
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 32 * sizeof(u32));
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if (ret)
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return ret;
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.fsr,
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32 * sizeof(u32),
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33 * sizeof(u32));
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}
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static const struct user_regset ptrace32_regsets[] = {
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[REGSET_GENERAL] = {
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.n = 19, .size = sizeof(u32),
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.regset_get = getregs_get, .set = setregs_set,
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},
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[REGSET_FP] = {
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.n = 68, .size = sizeof(u32),
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.regset_get = getfpregs_get, .set = setfpregs_set,
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},
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};
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static const struct user_regset_view ptrace32_view = {
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.regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
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};
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static const struct user_regset_view user_sparc32_view = {
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.name = "sparc", .e_machine = EM_SPARC,
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.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_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_sparc32_view;
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}
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struct fps {
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unsigned long regs[32];
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unsigned long fsr;
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unsigned long flags;
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unsigned long extra;
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unsigned long fpqd;
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struct fq {
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unsigned long *insnaddr;
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unsigned long insn;
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} fpq[16];
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};
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
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void __user *addr2p;
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struct pt_regs __user *pregs;
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struct fps __user *fps;
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int ret;
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addr2p = (void __user *) addr2;
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pregs = (struct pt_regs __user *) addr;
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fps = (struct fps __user *) addr;
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switch(request) {
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case PTRACE_GETREGS: {
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ret = copy_regset_to_user(child, &ptrace32_view,
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REGSET_GENERAL, 0,
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19 * sizeof(u32),
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pregs);
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break;
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}
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case PTRACE_SETREGS: {
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ret = copy_regset_from_user(child, &ptrace32_view,
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REGSET_GENERAL, 0,
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19 * sizeof(u32),
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pregs);
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break;
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}
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case PTRACE_GETFPREGS: {
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ret = copy_regset_to_user(child, &ptrace32_view,
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REGSET_FP, 0,
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68 * sizeof(u32),
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fps);
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break;
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}
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case PTRACE_SETFPREGS: {
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ret = copy_regset_from_user(child, &ptrace32_view,
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REGSET_FP, 0,
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33 * sizeof(u32),
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fps);
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break;
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}
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case PTRACE_READTEXT:
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case PTRACE_READDATA:
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ret = ptrace_readdata(child, addr, addr2p, data);
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if (ret == data)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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break;
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case PTRACE_WRITETEXT:
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case PTRACE_WRITEDATA:
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ret = ptrace_writedata(child, addr2p, addr, data);
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if (ret == data)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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break;
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default:
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if (request == PTRACE_SPARC_DETACH)
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request = PTRACE_DETACH;
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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 syscall_trace(struct pt_regs *regs, int syscall_exit_p)
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{
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int ret = 0;
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if (test_thread_flag(TIF_SYSCALL_TRACE)) {
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if (syscall_exit_p)
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ptrace_report_syscall_exit(regs, 0);
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else
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ret = ptrace_report_syscall_entry(regs);
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}
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return ret;
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}
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