6b9c7ed848
The ptrace_get_task_struct() helper that I added as part of the ptrace consolidation is useful in variety of places that currently opencode it. Switch them to the common helpers. Add a ptrace_traceme() helper that needs to be explicitly called, and simplify the ptrace_get_task_struct() interface. We don't need the request argument now, and we return the task_struct directly, using ERR_PTR() for error returns. It's a bit more code in the callers, but we have two sane routines that do one thing well now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
438 lines
11 KiB
C
438 lines
11 KiB
C
/*
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* ptrace for 32-bit processes running on a 64-bit kernel.
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/m68k/kernel/ptrace.c"
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* Copyright (C) 1994 by Hamish Macdonald
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* Taken from linux/kernel/ptrace.c and modified for M680x0.
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* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
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*
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* Modified by Cort Dougan (cort@hq.fsmlabs.com)
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* and Paul Mackerras (paulus@samba.org).
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of
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* this archive for more details.
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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/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/security.h>
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#include <linux/signal.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include "ptrace-common.h"
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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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long compat_sys_ptrace(int request, int pid, unsigned long addr,
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unsigned long data)
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{
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struct task_struct *child;
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int ret;
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lock_kernel();
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if (request == PTRACE_TRACEME) {
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ret = ptrace_traceme();
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goto out;
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}
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child = ptrace_get_task_struct(pid);
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if (IS_ERR(child)) {
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ret = PTR_ERR(child);
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goto out;
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}
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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 int 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, (u32 __user *)data);
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break;
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}
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/*
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* Read 4 bytes of the other process' storage
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* data is a pointer specifying where the user wants the
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* 4 bytes copied into
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* addr is a pointer in the user's storage that contains an 8 byte
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* address in the other process of the 4 bytes that is to be read
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* (this is run in a 32-bit process looking at a 64-bit process)
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* when I and D space are separate, these will need to be fixed.
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*/
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case PPC_PTRACE_PEEKTEXT_3264:
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case PPC_PTRACE_PEEKDATA_3264: {
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u32 tmp;
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int copied;
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u32 __user * addrOthers;
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ret = -EIO;
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/* Get the addr in the other process that we want to read */
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if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
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break;
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copied = access_process_vm(child, (u64)addrOthers, &tmp,
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sizeof(tmp), 0);
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if (copied != sizeof(tmp))
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break;
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ret = put_user(tmp, (u32 __user *)data);
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break;
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}
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/* Read a register (specified by ADDR) out of the "user area" */
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case PTRACE_PEEKUSR: {
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int index;
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unsigned long tmp;
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ret = -EIO;
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/* convert to index and check */
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index = (unsigned long) addr >> 2;
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if ((addr & 3) || (index > PT_FPSCR32))
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break;
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if (index < PT_FPR0) {
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tmp = get_reg(child, index);
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} else {
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flush_fp_to_thread(child);
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/*
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* the user space code considers the floating point
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* to be an array of unsigned int (32 bits) - the
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* index passed in is based on this assumption.
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*/
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tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
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}
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ret = put_user((unsigned int)tmp, (u32 __user *)data);
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break;
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}
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/*
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* Read 4 bytes out of the other process' pt_regs area
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* data is a pointer specifying where the user wants the
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* 4 bytes copied into
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* addr is the offset into the other process' pt_regs structure
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* that is to be read
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* (this is run in a 32-bit process looking at a 64-bit process)
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*/
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case PPC_PTRACE_PEEKUSR_3264: {
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u32 index;
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u32 reg32bits;
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u64 tmp;
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u32 numReg;
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u32 part;
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ret = -EIO;
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/* Determine which register the user wants */
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index = (u64)addr >> 2;
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numReg = index / 2;
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/* Determine which part of the register the user wants */
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if (index % 2)
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part = 1; /* want the 2nd half of the register (right-most). */
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else
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part = 0; /* want the 1st half of the register (left-most). */
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/* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
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if ((addr & 3) || numReg > PT_FPSCR)
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break;
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if (numReg >= PT_FPR0) {
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flush_fp_to_thread(child);
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tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
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} else { /* register within PT_REGS struct */
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tmp = get_reg(child, numReg);
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}
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reg32bits = ((u32*)&tmp)[part];
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ret = put_user(reg32bits, (u32 __user *)data);
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break;
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}
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/* If 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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unsigned int tmp;
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tmp = data;
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ret = 0;
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if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
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== sizeof(tmp))
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break;
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ret = -EIO;
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break;
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}
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/*
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* Write 4 bytes into the other process' storage
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* data is the 4 bytes that the user wants written
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* addr is a pointer in the user's storage that contains an
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* 8 byte address in the other process where the 4 bytes
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* that is to be written
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* (this is run in a 32-bit process looking at a 64-bit process)
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* when I and D space are separate, these will need to be fixed.
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*/
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case PPC_PTRACE_POKETEXT_3264:
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case PPC_PTRACE_POKEDATA_3264: {
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u32 tmp = data;
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u32 __user * addrOthers;
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/* Get the addr in the other process that we want to write into */
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ret = -EIO;
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if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
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break;
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ret = 0;
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if (access_process_vm(child, (u64)addrOthers, &tmp,
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sizeof(tmp), 1) == sizeof(tmp))
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break;
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ret = -EIO;
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break;
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}
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/* write the word at location addr in the USER area */
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case PTRACE_POKEUSR: {
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unsigned long index;
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ret = -EIO;
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/* convert to index and check */
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index = (unsigned long) addr >> 2;
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if ((addr & 3) || (index > PT_FPSCR32))
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break;
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if (index == PT_ORIG_R3)
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break;
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if (index < PT_FPR0) {
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ret = put_reg(child, index, data);
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} else {
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flush_fp_to_thread(child);
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/*
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* the user space code considers the floating point
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* to be an array of unsigned int (32 bits) - the
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* index passed in is based on this assumption.
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*/
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((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
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ret = 0;
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}
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break;
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}
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/*
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* Write 4 bytes into the other process' pt_regs area
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* data is the 4 bytes that the user wants written
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* addr is the offset into the other process' pt_regs structure
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* that is to be written into
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* (this is run in a 32-bit process looking at a 64-bit process)
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*/
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case PPC_PTRACE_POKEUSR_3264: {
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u32 index;
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u32 numReg;
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ret = -EIO;
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/* Determine which register the user wants */
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index = (u64)addr >> 2;
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numReg = index / 2;
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/*
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* Validate the input - check to see if address is on the
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* wrong boundary or beyond the end of the user area
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*/
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if ((addr & 3) || (numReg > PT_FPSCR))
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break;
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/* Insure it is a register we let them change */
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if ((numReg == PT_ORIG_R3)
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|| ((numReg > PT_CCR) && (numReg < PT_FPR0)))
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break;
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if (numReg >= PT_FPR0) {
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flush_fp_to_thread(child);
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}
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if (numReg == PT_MSR)
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data = (data & MSR_DEBUGCHANGE)
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| (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
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((u32*)child->thread.regs)[index] = data;
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ret = 0;
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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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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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clear_single_step(child);
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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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/* make sure the single step bit is not set. */
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clear_single_step(child);
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wake_up_process(child);
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break;
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}
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case PTRACE_SINGLESTEP: { /* set the trap flag. */
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ret = -EIO;
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if (!valid_signal(data))
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break;
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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set_single_step(child);
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child->exit_code = data;
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/* give it a chance to run. */
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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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case PTRACE_GET_DEBUGREG: {
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ret = -EINVAL;
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/* We only support one DABR and no IABRS at the moment */
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if (addr > 0)
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break;
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ret = put_user(child->thread.dabr, (u32 __user *)data);
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break;
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}
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case PTRACE_SET_DEBUGREG:
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ret = ptrace_set_debugreg(child, addr, data);
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break;
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case PTRACE_DETACH:
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ret = ptrace_detach(child, data);
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break;
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case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */
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int i;
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unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
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unsigned int __user *tmp = (unsigned int __user *)addr;
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for (i = 0; i < 32; i++) {
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ret = put_user(*reg, tmp);
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if (ret)
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break;
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reg++;
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tmp++;
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}
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break;
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}
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case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */
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int i;
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unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
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unsigned int __user *tmp = (unsigned int __user *)addr;
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for (i = 0; i < 32; i++) {
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ret = get_user(*reg, tmp);
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if (ret)
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break;
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reg++;
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tmp++;
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}
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break;
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}
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case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */
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int i;
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unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
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unsigned int __user *tmp = (unsigned int __user *)addr;
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flush_fp_to_thread(child);
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for (i = 0; i < 32; i++) {
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ret = put_user(*reg, tmp);
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if (ret)
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break;
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reg++;
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tmp++;
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}
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break;
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}
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case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */
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int i;
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unsigned long *reg = &((unsigned long *)child->thread.fpr)[0];
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unsigned int __user *tmp = (unsigned int __user *)addr;
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flush_fp_to_thread(child);
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for (i = 0; i < 32; i++) {
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ret = get_user(*reg, tmp);
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if (ret)
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break;
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reg++;
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tmp++;
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}
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break;
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}
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case PTRACE_GETEVENTMSG:
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ret = put_user(child->ptrace_message, (unsigned int __user *) data);
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break;
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#ifdef CONFIG_ALTIVEC
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case PTRACE_GETVRREGS:
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/* Get the child altivec register state. */
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flush_altivec_to_thread(child);
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ret = get_vrregs((unsigned long __user *)data, child);
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break;
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case PTRACE_SETVRREGS:
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/* Set the child altivec register state. */
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flush_altivec_to_thread(child);
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ret = set_vrregs(child, (unsigned long __user *)data);
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break;
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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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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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