2005-06-24 05:01:16 +00:00
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// TODO some minor issues
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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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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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* Chris Zankel <chris@zankel.net>
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* Scott Foehner<sfoehner@yahoo.com>,
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* Kevin Chea
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* Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
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*/
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#include <linux/config.h>
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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/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/security.h>
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2005-06-30 09:58:56 +00:00
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#include <linux/signal.h>
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2005-06-24 05:01:16 +00:00
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/elf.h>
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#define TEST_KERNEL // verify kernel operations FIXME: remove
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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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int sys_ptrace(long request, long pid, long addr, long data)
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{
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struct task_struct *child;
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int ret = -EPERM;
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lock_kernel();
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#if 0
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if ((int)request != 1)
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printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
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(int) request, (int) pid, (unsigned long) addr,
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(unsigned long) data);
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#endif
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if (request == PTRACE_TRACEME) {
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/* Are we already being traced? */
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if (current->ptrace & PT_PTRACED)
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goto out;
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if ((ret = security_ptrace(current->parent, current)))
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goto out;
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/* Set the ptrace bit in the process flags. */
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current->ptrace |= PT_PTRACED;
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ret = 0;
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goto out;
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}
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ret = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (!child)
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goto out;
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ret = -EPERM;
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if (pid == 1) /* you may not mess with init */
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goto out;
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if (request == PTRACE_ATTACH) {
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ret = ptrace_attach(child);
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goto out_tsk;
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}
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if ((ret = ptrace_check_attach(child, request == PTRACE_KILL)) < 0)
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goto out_tsk;
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switch (request) {
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA:
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{
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unsigned long tmp;
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int copied;
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copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
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ret = -EIO;
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp,(unsigned long *) data);
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goto out;
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}
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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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{
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struct pt_regs *regs;
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unsigned long tmp;
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regs = xtensa_pt_regs(child);
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tmp = 0; /* Default return value. */
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switch(addr) {
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case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
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{
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int ar = addr - REG_AR_BASE - regs->windowbase * 4;
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ar &= (XCHAL_NUM_AREGS - 1);
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if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0)
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tmp = regs->areg[ar];
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else
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ret = -EIO;
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break;
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}
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case REG_A_BASE ... REG_A_BASE + 15:
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tmp = regs->areg[addr - REG_A_BASE];
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break;
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case REG_PC:
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tmp = regs->pc;
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break;
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case REG_PS:
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/* Note: PS.EXCM is not set while user task is running;
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* its being set in regs is for exception handling
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* convenience. */
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tmp = (regs->ps & ~XCHAL_PS_EXCM_MASK);
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break;
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case REG_WB:
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tmp = regs->windowbase;
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break;
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case REG_WS:
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tmp = regs->windowstart;
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break;
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case REG_LBEG:
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tmp = regs->lbeg;
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break;
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case REG_LEND:
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tmp = regs->lend;
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break;
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case REG_LCOUNT:
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tmp = regs->lcount;
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break;
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case REG_SAR:
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tmp = regs->sar;
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break;
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case REG_DEPC:
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tmp = regs->depc;
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break;
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case REG_EXCCAUSE:
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tmp = regs->exccause;
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break;
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case REG_EXCVADDR:
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tmp = regs->excvaddr;
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break;
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case SYSCALL_NR:
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tmp = regs->syscall;
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break;
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default:
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tmp = 0;
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ret = -EIO;
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goto out;
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}
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ret = put_user(tmp, (unsigned long *) data);
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goto out;
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}
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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if (access_process_vm(child, addr, &data, sizeof(data), 1)
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== sizeof(data))
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break;
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ret = -EIO;
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goto out;
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case PTRACE_POKEUSR:
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{
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struct pt_regs *regs;
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regs = xtensa_pt_regs(child);
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switch (addr) {
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case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
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{
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int ar = addr - REG_AR_BASE - regs->windowbase * 4;
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if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0)
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regs->areg[ar & (XCHAL_NUM_AREGS - 1)] = data;
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else
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ret = -EIO;
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break;
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}
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case REG_A_BASE ... REG_A_BASE + 15:
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regs->areg[addr - REG_A_BASE] = data;
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break;
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case REG_PC:
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regs->pc = data;
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break;
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case SYSCALL_NR:
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regs->syscall = data;
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break;
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#ifdef TEST_KERNEL
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case REG_WB:
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regs->windowbase = data;
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break;
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case REG_WS:
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regs->windowstart = data;
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break;
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#endif
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default:
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/* The rest are not allowed. */
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ret = -EIO;
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break;
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}
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break;
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}
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/* continue and stop at next (return from) syscall */
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case PTRACE_SYSCALL:
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case PTRACE_CONT: /* restart after signal. */
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{
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ret = -EIO;
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2005-06-30 09:58:56 +00:00
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if (!valid_signal(data))
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2005-06-24 05:01:16 +00:00
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break;
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if (request == PTRACE_SYSCALL)
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set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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else
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->exit_code = data;
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/* Make sure the single step bit is not set. */
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child->ptrace &= ~PT_SINGLESTEP;
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wake_up_process(child);
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ret = 0;
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break;
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}
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/*
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* make the child exit. Best I can do is send it a sigkill.
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* perhaps it should be put in the status that it wants to
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* exit.
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*/
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case PTRACE_KILL:
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ret = 0;
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if (child->state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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child->ptrace &= ~PT_SINGLESTEP;
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wake_up_process(child);
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break;
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case PTRACE_SINGLESTEP:
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ret = -EIO;
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2005-06-30 09:58:56 +00:00
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if (!valid_signal(data))
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2005-06-24 05:01:16 +00:00
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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child->ptrace |= PT_SINGLESTEP;
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child->exit_code = data;
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wake_up_process(child);
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ret = 0;
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break;
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case PTRACE_GETREGS:
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{
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/* 'data' points to user memory in which to write.
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* Mainly due to the non-live register values, we
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* reformat the register values into something more
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* standard. For convenience, we use the handy
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* elf_gregset_t format. */
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xtensa_gregset_t format;
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struct pt_regs *regs = xtensa_pt_regs(child);
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do_copy_regs (&format, regs, child);
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/* Now, copy to user space nice and easy... */
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ret = 0;
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if (copy_to_user((void *)data, &format, sizeof(elf_gregset_t)))
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ret = -EFAULT;
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break;
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}
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case PTRACE_SETREGS:
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{
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/* 'data' points to user memory that contains the new
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* values in the elf_gregset_t format. */
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xtensa_gregset_t format;
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struct pt_regs *regs = xtensa_pt_regs(child);
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if (copy_from_user(&format,(void *)data,sizeof(elf_gregset_t))){
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ret = -EFAULT;
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break;
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}
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/* FIXME: Perhaps we want some sanity checks on
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* these user-space values? See ARM version. Are
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* debuggers a security concern? */
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do_restore_regs (&format, regs, child);
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ret = 0;
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break;
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}
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case PTRACE_GETFPREGS:
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{
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/* 'data' points to user memory in which to write.
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* For convenience, we use the handy
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* elf_fpregset_t format. */
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elf_fpregset_t fpregs;
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struct pt_regs *regs = xtensa_pt_regs(child);
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do_save_fpregs (&fpregs, regs, child);
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/* Now, copy to user space nice and easy... */
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ret = 0;
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if (copy_to_user((void *)data, &fpregs, sizeof(elf_fpregset_t)))
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ret = -EFAULT;
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break;
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}
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case PTRACE_SETFPREGS:
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{
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/* 'data' points to user memory that contains the new
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* values in the elf_fpregset_t format.
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*/
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elf_fpregset_t fpregs;
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struct pt_regs *regs = xtensa_pt_regs(child);
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ret = 0;
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if (copy_from_user(&fpregs, (void *)data, sizeof(elf_fpregset_t))) {
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ret = -EFAULT;
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break;
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}
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if (do_restore_fpregs (&fpregs, regs, child))
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ret = -EIO;
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break;
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}
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case PTRACE_GETFPREGSIZE:
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/* 'data' points to 'unsigned long' set to the size
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* of elf_fpregset_t
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*/
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ret = put_user(sizeof(elf_fpregset_t), (unsigned long *) data);
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break;
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case PTRACE_DETACH: /* detach a process that was attached. */
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ret = ptrace_detach(child, data);
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break;
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default:
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ret = ptrace_request(child, request, addr, data);
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goto out;
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}
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out_tsk:
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put_task_struct(child);
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out:
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|
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unlock_kernel();
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return ret;
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|
}
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|
|
void do_syscall_trace(void)
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|
|
{
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|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
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|
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return;
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|
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|
|
if (!(current->ptrace & PT_PTRACED))
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|
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return;
|
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|
|
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|
|
/*
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|
|
* The 0x80 provides a way for the tracing parent to distinguish
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|
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* between a syscall stop and SIGTRAP delivery
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|
|
*/
|
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ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
|
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|
|
|
|
|
|
/*
|
|
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
|
|
* for normal use. strace only continues with a signal if the
|
|
|
|
* stopping signal is not SIGTRAP. -brl
|
|
|
|
*/
|
|
|
|
if (current->exit_code) {
|
|
|
|
send_sig(current->exit_code, current, 1);
|
|
|
|
current->exit_code = 0;
|
|
|
|
}
|
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|
|
}
|