forked from Minki/linux
abd0650541
One of the gratuitous difference between 32 and 64-bit ptrace is whether you can whack the MSR:FE0 and FE1 bits from ptrace. This patch forbids it unconditionally. In addition, the 64-bit kernels used to return the exception mode in the MSR on reads, but 32-bit kernels didn't. This patch makes it return those bits on both. Finally, since ptrace-ppc32.h and ptrace-ppc64.h are mostly empty now, and since the previous patch made ptrace32.c no longer need the MSR_DEBUGCHANGE definition, we just remove those 2 files and move back the remaining bits to ptrace.c (they were short lived heh ?). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
406 lines
10 KiB
C
406 lines
10 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/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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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
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* we mark them as obsolete now, they will be removed in a future version
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*/
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static long compat_ptrace_old(struct task_struct *child, long request,
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long addr, long data)
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{
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int ret = -EPERM;
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switch(request) {
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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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}
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return ret;
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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 = ptrace_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
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* 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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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 = ptrace_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_FPR0) {
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ret = ptrace_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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if (numReg < PT_FPR0) {
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unsigned long freg = ptrace_get_reg(child, numReg);
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if (index % 2)
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freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
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else
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freg = (freg & 0xfffffffful) | (data << 32);
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ret = ptrace_put_reg(child, numReg, freg);
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} else {
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flush_fp_to_thread(child);
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((unsigned int *)child->thread.regs)[index] = data;
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ret = 0;
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}
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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_GETEVENTMSG:
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ret = put_user(child->ptrace_message, (unsigned int __user *) data);
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break;
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case PTRACE_GETREGS: { /* Get all pt_regs from the child. */
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int ui;
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if (!access_ok(VERIFY_WRITE, (void __user *)data,
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PT_REGS_COUNT * sizeof(int))) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
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ret |= __put_user(ptrace_get_reg(child, ui),
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(unsigned int __user *) data);
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data += sizeof(int);
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}
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break;
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}
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case PTRACE_SETREGS: { /* Set all gp regs in the child. */
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unsigned long tmp;
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int ui;
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if (!access_ok(VERIFY_READ, (void __user *)data,
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PT_REGS_COUNT * sizeof(int))) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
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ret = __get_user(tmp, (unsigned int __user *) data);
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if (ret)
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break;
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ptrace_put_reg(child, ui, tmp);
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data += sizeof(int);
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}
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break;
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}
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case PTRACE_GETFPREGS:
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case PTRACE_SETFPREGS:
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case PTRACE_GETVRREGS:
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case PTRACE_SETVRREGS:
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case PTRACE_GETREGS64:
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case PTRACE_SETREGS64:
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case PPC_PTRACE_GETFPREGS:
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case PPC_PTRACE_SETFPREGS:
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case PTRACE_KILL:
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case PTRACE_SINGLESTEP:
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case PTRACE_DETACH:
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case PTRACE_SET_DEBUGREG:
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case PTRACE_SYSCALL:
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case PTRACE_CONT:
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ret = arch_ptrace(child, request, addr, data);
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break;
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/* Old reverse args ptrace callss */
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case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
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case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
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ret = compat_ptrace_old(child, request, addr, 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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