401 lines
9.1 KiB
C
401 lines
9.1 KiB
C
/*
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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) 1992 Ross Biro
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* Copyright (C) Linus Torvalds
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* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
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* Copyright (C) 1996 David S. Miller
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 1999 MIPS Technologies, Inc.
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* Copyright (C) 2000 Ulf Carlsson
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*
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* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
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* binaries.
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*/
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#include <linux/config.h>
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#include <linux/compiler.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/audit.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <asm/byteorder.h>
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#include <asm/cpu.h>
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#include <asm/dsp.h>
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#include <asm/fpu.h>
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#include <asm/mipsregs.h>
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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/bootinfo.h>
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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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asmlinkage 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;
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#if 0
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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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lock_kernel();
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ret = -EPERM;
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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_tsk;
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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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ret = ptrace_check_attach(child, request == PTRACE_KILL);
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if (ret < 0)
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goto out_tsk;
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switch (request) {
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/* when I and D space are separate, these will need to be fixed. */
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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case PTRACE_PEEKDATA: {
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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 __user *) data);
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break;
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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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struct pt_regs *regs;
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unsigned long tmp = 0;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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ret = 0; /* Default return value. */
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switch (addr) {
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case 0 ... 31:
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tmp = regs->regs[addr];
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break;
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case FPR_BASE ... FPR_BASE + 31:
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if (tsk_used_math(child)) {
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fpureg_t *fregs = get_fpu_regs(child);
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#ifdef CONFIG_32BIT
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/*
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* The odd registers are actually the high
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* order bits of the values stored in the even
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* registers - unless we're using r2k_switch.S.
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*/
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if (addr & 1)
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tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
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else
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tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
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#endif
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#ifdef CONFIG_64BIT
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tmp = fregs[addr - FPR_BASE];
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#endif
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} else {
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tmp = -1; /* FP not yet used */
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}
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break;
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case PC:
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tmp = regs->cp0_epc;
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break;
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case CAUSE:
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tmp = regs->cp0_cause;
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break;
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case BADVADDR:
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tmp = regs->cp0_badvaddr;
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break;
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case MMHI:
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tmp = regs->hi;
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break;
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case MMLO:
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tmp = regs->lo;
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break;
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case FPC_CSR:
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if (cpu_has_fpu)
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tmp = child->thread.fpu.hard.fcr31;
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else
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tmp = child->thread.fpu.soft.fcr31;
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break;
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case FPC_EIR: { /* implementation / version register */
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unsigned int flags;
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if (!cpu_has_fpu)
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break;
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flags = read_c0_status();
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__enable_fpu();
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__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
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write_c0_status(flags);
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break;
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}
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case DSP_BASE ... DSP_BASE + 5: {
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dspreg_t *dregs;
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if (!cpu_has_dsp) {
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tmp = 0;
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ret = -EIO;
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goto out_tsk;
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}
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if (child->thread.dsp.used_dsp) {
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dregs = __get_dsp_regs(child);
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tmp = (unsigned long) (dregs[addr - DSP_BASE]);
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} else {
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tmp = -1; /* DSP registers yet used */
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}
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break;
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}
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case DSP_CONTROL:
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if (!cpu_has_dsp) {
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tmp = 0;
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ret = -EIO;
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goto out_tsk;
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}
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tmp = child->thread.dsp.dspcontrol;
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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_tsk;
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}
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ret = put_user(tmp, (unsigned long __user *) data);
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break;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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case PTRACE_POKEDATA:
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ret = 0;
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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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break;
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case PTRACE_POKEUSR: {
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struct pt_regs *regs;
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ret = 0;
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regs = (struct pt_regs *) ((unsigned long) child->thread_info +
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THREAD_SIZE - 32 - sizeof(struct pt_regs));
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switch (addr) {
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case 0 ... 31:
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regs->regs[addr] = data;
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break;
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case FPR_BASE ... FPR_BASE + 31: {
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fpureg_t *fregs = get_fpu_regs(child);
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if (!tsk_used_math(child)) {
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/* FP not yet used */
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memset(&child->thread.fpu.hard, ~0,
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sizeof(child->thread.fpu.hard));
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child->thread.fpu.hard.fcr31 = 0;
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}
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#ifdef CONFIG_32BIT
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/*
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* The odd registers are actually the high order bits
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* of the values stored in the even registers - unless
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* we're using r2k_switch.S.
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*/
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if (addr & 1) {
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fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
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fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
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} else {
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fregs[addr - FPR_BASE] &= ~0xffffffffLL;
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fregs[addr - FPR_BASE] |= data;
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}
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#endif
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#ifdef CONFIG_64BIT
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fregs[addr - FPR_BASE] = data;
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#endif
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break;
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}
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case PC:
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regs->cp0_epc = data;
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break;
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case MMHI:
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regs->hi = data;
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break;
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case MMLO:
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regs->lo = data;
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break;
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case FPC_CSR:
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if (cpu_has_fpu)
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child->thread.fpu.hard.fcr31 = data;
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else
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child->thread.fpu.soft.fcr31 = data;
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break;
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case DSP_BASE ... DSP_BASE + 5: {
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dspreg_t *dregs;
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if (!cpu_has_dsp) {
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ret = -EIO;
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break;
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}
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dregs = __get_dsp_regs(child);
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dregs[addr - DSP_BASE] = data;
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break;
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}
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case DSP_CONTROL:
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if (!cpu_has_dsp) {
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ret = -EIO;
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break;
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}
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child->thread.dsp.dspcontrol = data;
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break;
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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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case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
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case PTRACE_CONT: { /* restart after signal. */
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ret = -EIO;
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if (!valid_signal(data))
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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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}
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else {
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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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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}
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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->exit_state == EXIT_ZOMBIE) /* already dead */
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break;
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child->exit_code = SIGKILL;
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wake_up_process(child);
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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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case PTRACE_GET_THREAD_AREA:
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ret = put_user(child->thread_info->tp_value,
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(unsigned long __user *) 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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break;
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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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unlock_kernel();
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return ret;
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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_MIPS;
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#ifdef CONFIG_64BIT
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arch |= __AUDIT_ARCH_64BIT;
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#endif
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#if defined(__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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/*
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* Notification of system call entry/exit
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* - triggered by current->work.syscall_trace
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*/
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asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
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{
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if (unlikely(current->audit_context) && entryexit)
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audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
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regs->regs[2]);
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if (!(current->ptrace & PT_PTRACED))
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goto out;
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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goto out;
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/* The 0x80 provides a way for the tracing parent to distinguish
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between a syscall stop and SIGTRAP delivery */
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
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0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig(current->exit_code, current, 1);
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current->exit_code = 0;
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}
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out:
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if (unlikely(current->audit_context) && !entryexit)
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audit_syscall_entry(current, audit_arch(), regs->regs[2],
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regs->regs[4], regs->regs[5],
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regs->regs[6], regs->regs[7]);
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}
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