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754 lines
21 KiB
754 lines
21 KiB
/*
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* arch/s390/kernel/ptrace.c
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*
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* S390 version
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* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Based on 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@cs.nmt.edu)
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*
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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 README.legal 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/audit.h>
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#include <linux/signal.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#ifdef CONFIG_COMPAT
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#include "compat_ptrace.h"
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#endif
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static void
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FixPerRegisters(struct task_struct *task)
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{
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struct pt_regs *regs;
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per_struct *per_info;
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regs = task_pt_regs(task);
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per_info = (per_struct *) &task->thread.per_info;
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per_info->control_regs.bits.em_instruction_fetch =
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per_info->single_step | per_info->instruction_fetch;
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if (per_info->single_step) {
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per_info->control_regs.bits.starting_addr = 0;
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#ifdef CONFIG_COMPAT
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if (test_thread_flag(TIF_31BIT))
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per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
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else
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#endif
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per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN;
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} else {
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per_info->control_regs.bits.starting_addr =
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per_info->starting_addr;
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per_info->control_regs.bits.ending_addr =
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per_info->ending_addr;
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}
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/*
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* if any of the control reg tracing bits are on
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* we switch on per in the psw
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*/
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if (per_info->control_regs.words.cr[0] & PER_EM_MASK)
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regs->psw.mask |= PSW_MASK_PER;
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else
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regs->psw.mask &= ~PSW_MASK_PER;
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if (per_info->control_regs.bits.em_storage_alteration)
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per_info->control_regs.bits.storage_alt_space_ctl = 1;
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else
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per_info->control_regs.bits.storage_alt_space_ctl = 0;
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}
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void user_enable_single_step(struct task_struct *task)
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{
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task->thread.per_info.single_step = 1;
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FixPerRegisters(task);
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}
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void user_disable_single_step(struct task_struct *task)
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{
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task->thread.per_info.single_step = 0;
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FixPerRegisters(task);
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}
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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
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ptrace_disable(struct task_struct *child)
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{
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/* make sure the single step bit is not set. */
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user_disable_single_step(child);
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}
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#ifndef CONFIG_64BIT
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# define __ADDR_MASK 3
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#else
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# define __ADDR_MASK 7
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#endif
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/*
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* Read the word at offset addr from the user area of a process. The
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* trouble here is that the information is littered over different
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* locations. The process registers are found on the kernel stack,
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* the floating point stuff and the trace settings are stored in
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* the task structure. In addition the different structures in
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* struct user contain pad bytes that should be read as zeroes.
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* Lovely...
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*/
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static int
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peek_user(struct task_struct *child, addr_t addr, addr_t data)
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{
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struct user *dummy = NULL;
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addr_t offset, tmp, mask;
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/*
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* Stupid gdb peeks/pokes the access registers in 64 bit with
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* an alignment of 4. Programmers from hell...
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*/
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mask = __ADDR_MASK;
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#ifdef CONFIG_64BIT
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if (addr >= (addr_t) &dummy->regs.acrs &&
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addr < (addr_t) &dummy->regs.orig_gpr2)
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mask = 3;
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#endif
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if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
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return -EIO;
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if (addr < (addr_t) &dummy->regs.acrs) {
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/*
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* psw and gprs are stored on the stack
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*/
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tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
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if (addr == (addr_t) &dummy->regs.psw.mask)
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/* Remove per bit from user psw. */
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tmp &= ~PSW_MASK_PER;
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} else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* access registers are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.acrs;
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#ifdef CONFIG_64BIT
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/*
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* Very special case: old & broken 64 bit gdb reading
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* from acrs[15]. Result is a 64 bit value. Read the
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* 32 bit acrs[15] value and shift it by 32. Sick...
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*/
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if (addr == (addr_t) &dummy->regs.acrs[15])
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tmp = ((unsigned long) child->thread.acrs[15]) << 32;
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else
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#endif
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tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
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} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* orig_gpr2 is stored on the kernel stack
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*/
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tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
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} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
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/*
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* floating point regs. are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.fp_regs;
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tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
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if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
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tmp &= (unsigned long) FPC_VALID_MASK
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<< (BITS_PER_LONG - 32);
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} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
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/*
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* per_info is found in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.per_info;
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tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset);
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} else
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tmp = 0;
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return put_user(tmp, (addr_t __user *) data);
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}
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/*
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* Write a word to the user area of a process at location addr. This
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* operation does have an additional problem compared to peek_user.
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* Stores to the program status word and on the floating point
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* control register needs to get checked for validity.
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*/
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static int
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poke_user(struct task_struct *child, addr_t addr, addr_t data)
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{
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struct user *dummy = NULL;
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addr_t offset, mask;
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/*
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* Stupid gdb peeks/pokes the access registers in 64 bit with
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* an alignment of 4. Programmers from hell indeed...
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*/
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mask = __ADDR_MASK;
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#ifdef CONFIG_64BIT
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if (addr >= (addr_t) &dummy->regs.acrs &&
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addr < (addr_t) &dummy->regs.orig_gpr2)
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mask = 3;
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#endif
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if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
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return -EIO;
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if (addr < (addr_t) &dummy->regs.acrs) {
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/*
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* psw and gprs are stored on the stack
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*/
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if (addr == (addr_t) &dummy->regs.psw.mask &&
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#ifdef CONFIG_COMPAT
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data != PSW_MASK_MERGE(psw_user32_bits, data) &&
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#endif
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data != PSW_MASK_MERGE(psw_user_bits, data))
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/* Invalid psw mask. */
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return -EINVAL;
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#ifndef CONFIG_64BIT
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if (addr == (addr_t) &dummy->regs.psw.addr)
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/* I'd like to reject addresses without the
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high order bit but older gdb's rely on it */
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data |= PSW_ADDR_AMODE;
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#endif
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*(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
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} else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
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/*
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* access registers are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.acrs;
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#ifdef CONFIG_64BIT
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/*
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* Very special case: old & broken 64 bit gdb writing
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* to acrs[15] with a 64 bit value. Ignore the lower
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* half of the value and write the upper 32 bit to
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* acrs[15]. Sick...
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*/
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if (addr == (addr_t) &dummy->regs.acrs[15])
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child->thread.acrs[15] = (unsigned int) (data >> 32);
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else
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#endif
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*(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
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} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
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/*
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* orig_gpr2 is stored on the kernel stack
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*/
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task_pt_regs(child)->orig_gpr2 = data;
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} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
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/*
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* floating point regs. are stored in the thread structure
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*/
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if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
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(data & ~((unsigned long) FPC_VALID_MASK
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<< (BITS_PER_LONG - 32))) != 0)
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return -EINVAL;
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offset = addr - (addr_t) &dummy->regs.fp_regs;
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*(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
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} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
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/*
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* per_info is found in the thread structure
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*/
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offset = addr - (addr_t) &dummy->regs.per_info;
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*(addr_t *)((addr_t) &child->thread.per_info + offset) = data;
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}
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FixPerRegisters(child);
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return 0;
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}
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static int
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do_ptrace_normal(struct task_struct *child, long request, long addr, long data)
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{
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ptrace_area parea;
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int copied, ret;
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switch (request) {
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case PTRACE_PEEKTEXT:
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case PTRACE_PEEKDATA:
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/* Remove high order bit from address (only for 31 bit). */
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addr &= PSW_ADDR_INSN;
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/* read word at location addr. */
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return generic_ptrace_peekdata(child, addr, data);
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case PTRACE_PEEKUSR:
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/* read the word at location addr in the USER area. */
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return peek_user(child, addr, data);
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case PTRACE_POKETEXT:
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case PTRACE_POKEDATA:
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/* Remove high order bit from address (only for 31 bit). */
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addr &= PSW_ADDR_INSN;
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/* write the word at location addr. */
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return generic_ptrace_pokedata(child, addr, data);
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case PTRACE_POKEUSR:
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/* write the word at location addr in the USER area */
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return poke_user(child, addr, data);
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case PTRACE_PEEKUSR_AREA:
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case PTRACE_POKEUSR_AREA:
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if (copy_from_user(&parea, (void __force __user *) addr,
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sizeof(parea)))
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return -EFAULT;
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addr = parea.kernel_addr;
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data = parea.process_addr;
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copied = 0;
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while (copied < parea.len) {
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if (request == PTRACE_PEEKUSR_AREA)
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ret = peek_user(child, addr, data);
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else {
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addr_t utmp;
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if (get_user(utmp,
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(addr_t __force __user *) data))
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return -EFAULT;
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ret = poke_user(child, addr, utmp);
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}
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if (ret)
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return ret;
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addr += sizeof(unsigned long);
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data += sizeof(unsigned long);
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copied += sizeof(unsigned long);
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}
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return 0;
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}
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return ptrace_request(child, request, addr, data);
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}
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#ifdef CONFIG_COMPAT
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/*
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* Now the fun part starts... a 31 bit program running in the
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* 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
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* PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
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* to handle, the difference to the 64 bit versions of the requests
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* is that the access is done in multiples of 4 byte instead of
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* 8 bytes (sizeof(unsigned long) on 31/64 bit).
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* The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
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* PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
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* is a 31 bit program too, the content of struct user can be
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* emulated. A 31 bit program peeking into the struct user of
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* a 64 bit program is a no-no.
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*/
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/*
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* Same as peek_user but for a 31 bit program.
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*/
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static int
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peek_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
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{
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struct user32 *dummy32 = NULL;
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per_struct32 *dummy_per32 = NULL;
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addr_t offset;
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__u32 tmp;
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if (!test_thread_flag(TIF_31BIT) ||
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(addr & 3) || addr > sizeof(struct user) - 3)
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return -EIO;
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if (addr < (addr_t) &dummy32->regs.acrs) {
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/*
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* psw and gprs are stored on the stack
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*/
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if (addr == (addr_t) &dummy32->regs.psw.mask) {
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/* Fake a 31 bit psw mask. */
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tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32);
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tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp);
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} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
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/* Fake a 31 bit psw address. */
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tmp = (__u32) task_pt_regs(child)->psw.addr |
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PSW32_ADDR_AMODE31;
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} else {
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/* gpr 0-15 */
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tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw +
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addr*2 + 4);
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}
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} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
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/*
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* access registers are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy32->regs.acrs;
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tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
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} else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
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/*
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* orig_gpr2 is stored on the kernel stack
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*/
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tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
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} else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
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/*
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* floating point regs. are stored in the thread structure
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*/
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offset = addr - (addr_t) &dummy32->regs.fp_regs;
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tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
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} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
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/*
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* per_info is found in the thread structure
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*/
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offset = addr - (addr_t) &dummy32->regs.per_info;
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/* This is magic. See per_struct and per_struct32. */
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if ((offset >= (addr_t) &dummy_per32->control_regs &&
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offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
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(offset >= (addr_t) &dummy_per32->starting_addr &&
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offset <= (addr_t) &dummy_per32->ending_addr) ||
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offset == (addr_t) &dummy_per32->lowcore.words.address)
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offset = offset*2 + 4;
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else
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offset = offset*2;
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tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset);
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} else
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tmp = 0;
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return put_user(tmp, (__u32 __user *) data);
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}
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/*
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* Same as poke_user but for a 31 bit program.
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*/
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static int
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poke_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
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{
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struct user32 *dummy32 = NULL;
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per_struct32 *dummy_per32 = NULL;
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addr_t offset;
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__u32 tmp;
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if (!test_thread_flag(TIF_31BIT) ||
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(addr & 3) || addr > sizeof(struct user32) - 3)
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return -EIO;
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tmp = (__u32) data;
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if (addr < (addr_t) &dummy32->regs.acrs) {
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/*
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* psw, gprs, acrs and orig_gpr2 are stored on the stack
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*/
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if (addr == (addr_t) &dummy32->regs.psw.mask) {
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/* Build a 64 bit psw mask from 31 bit mask. */
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if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp))
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/* Invalid psw mask. */
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return -EINVAL;
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task_pt_regs(child)->psw.mask =
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PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32);
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} else if (addr == (addr_t) &dummy32->regs.psw.addr) {
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/* Build a 64 bit psw address from 31 bit address. */
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task_pt_regs(child)->psw.addr =
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(__u64) tmp & PSW32_ADDR_INSN;
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} else {
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/* gpr 0-15 */
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*(__u32*)((addr_t) &task_pt_regs(child)->psw
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+ addr*2 + 4) = tmp;
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}
|
|
} else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* access registers are stored in the thread structure
|
|
*/
|
|
offset = addr - (addr_t) &dummy32->regs.acrs;
|
|
*(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
|
|
|
|
} else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
|
|
/*
|
|
* orig_gpr2 is stored on the kernel stack
|
|
*/
|
|
*(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
|
|
/*
|
|
* floating point regs. are stored in the thread structure
|
|
*/
|
|
if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
|
|
(tmp & ~FPC_VALID_MASK) != 0)
|
|
/* Invalid floating point control. */
|
|
return -EINVAL;
|
|
offset = addr - (addr_t) &dummy32->regs.fp_regs;
|
|
*(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
|
|
|
|
} else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
|
|
/*
|
|
* per_info is found in the thread structure.
|
|
*/
|
|
offset = addr - (addr_t) &dummy32->regs.per_info;
|
|
/*
|
|
* This is magic. See per_struct and per_struct32.
|
|
* By incident the offsets in per_struct are exactly
|
|
* twice the offsets in per_struct32 for all fields.
|
|
* The 8 byte fields need special handling though,
|
|
* because the second half (bytes 4-7) is needed and
|
|
* not the first half.
|
|
*/
|
|
if ((offset >= (addr_t) &dummy_per32->control_regs &&
|
|
offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
|
|
(offset >= (addr_t) &dummy_per32->starting_addr &&
|
|
offset <= (addr_t) &dummy_per32->ending_addr) ||
|
|
offset == (addr_t) &dummy_per32->lowcore.words.address)
|
|
offset = offset*2 + 4;
|
|
else
|
|
offset = offset*2;
|
|
*(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp;
|
|
|
|
}
|
|
|
|
FixPerRegisters(child);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
unsigned int tmp; /* 4 bytes !! */
|
|
ptrace_area_emu31 parea;
|
|
int copied, ret;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKTEXT:
|
|
case PTRACE_PEEKDATA:
|
|
/* read word at location addr. */
|
|
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
|
|
if (copied != sizeof(tmp))
|
|
return -EIO;
|
|
return put_user(tmp, (unsigned int __force __user *) data);
|
|
|
|
case PTRACE_PEEKUSR:
|
|
/* read the word at location addr in the USER area. */
|
|
return peek_user_emu31(child, addr, data);
|
|
|
|
case PTRACE_POKETEXT:
|
|
case PTRACE_POKEDATA:
|
|
/* write the word at location addr. */
|
|
tmp = data;
|
|
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
|
|
if (copied != sizeof(tmp))
|
|
return -EIO;
|
|
return 0;
|
|
|
|
case PTRACE_POKEUSR:
|
|
/* write the word at location addr in the USER area */
|
|
return poke_user_emu31(child, addr, data);
|
|
|
|
case PTRACE_PEEKUSR_AREA:
|
|
case PTRACE_POKEUSR_AREA:
|
|
if (copy_from_user(&parea, (void __force __user *) addr,
|
|
sizeof(parea)))
|
|
return -EFAULT;
|
|
addr = parea.kernel_addr;
|
|
data = parea.process_addr;
|
|
copied = 0;
|
|
while (copied < parea.len) {
|
|
if (request == PTRACE_PEEKUSR_AREA)
|
|
ret = peek_user_emu31(child, addr, data);
|
|
else {
|
|
__u32 utmp;
|
|
if (get_user(utmp,
|
|
(__u32 __force __user *) data))
|
|
return -EFAULT;
|
|
ret = poke_user_emu31(child, addr, utmp);
|
|
}
|
|
if (ret)
|
|
return ret;
|
|
addr += sizeof(unsigned int);
|
|
data += sizeof(unsigned int);
|
|
copied += sizeof(unsigned int);
|
|
}
|
|
return 0;
|
|
case PTRACE_GETEVENTMSG:
|
|
return put_user((__u32) child->ptrace_message,
|
|
(unsigned int __force __user *) data);
|
|
case PTRACE_GETSIGINFO:
|
|
if (child->last_siginfo == NULL)
|
|
return -EINVAL;
|
|
return copy_siginfo_to_user32((compat_siginfo_t
|
|
__force __user *) data,
|
|
child->last_siginfo);
|
|
case PTRACE_SETSIGINFO:
|
|
if (child->last_siginfo == NULL)
|
|
return -EINVAL;
|
|
return copy_siginfo_from_user32(child->last_siginfo,
|
|
(compat_siginfo_t
|
|
__force __user *) data);
|
|
}
|
|
return ptrace_request(child, request, addr, data);
|
|
}
|
|
#endif
|
|
|
|
#define PT32_IEEE_IP 0x13c
|
|
|
|
static int
|
|
do_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
int ret;
|
|
|
|
if (request == PTRACE_ATTACH)
|
|
return ptrace_attach(child);
|
|
|
|
/*
|
|
* Special cases to get/store the ieee instructions pointer.
|
|
*/
|
|
if (child == current) {
|
|
if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP)
|
|
return peek_user(child, addr, data);
|
|
if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP)
|
|
return poke_user(child, addr, data);
|
|
#ifdef CONFIG_COMPAT
|
|
if (request == PTRACE_PEEKUSR &&
|
|
addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
|
|
return peek_user_emu31(child, addr, data);
|
|
if (request == PTRACE_POKEUSR &&
|
|
addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
|
|
return poke_user_emu31(child, addr, data);
|
|
#endif
|
|
}
|
|
|
|
ret = ptrace_check_attach(child, request == PTRACE_KILL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (request) {
|
|
case PTRACE_SYSCALL:
|
|
/* continue and stop at next (return from) syscall */
|
|
case PTRACE_CONT:
|
|
/* restart after signal. */
|
|
if (!valid_signal(data))
|
|
return -EIO;
|
|
if (request == PTRACE_SYSCALL)
|
|
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
else
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
child->exit_code = data;
|
|
/* make sure the single step bit is not set. */
|
|
user_disable_single_step(child);
|
|
wake_up_process(child);
|
|
return 0;
|
|
|
|
case PTRACE_KILL:
|
|
/*
|
|
* make the child exit. Best I can do is send it a sigkill.
|
|
* perhaps it should be put in the status that it wants to
|
|
* exit.
|
|
*/
|
|
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
|
|
return 0;
|
|
child->exit_code = SIGKILL;
|
|
/* make sure the single step bit is not set. */
|
|
user_disable_single_step(child);
|
|
wake_up_process(child);
|
|
return 0;
|
|
|
|
case PTRACE_SINGLESTEP:
|
|
/* set the trap flag. */
|
|
if (!valid_signal(data))
|
|
return -EIO;
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
child->exit_code = data;
|
|
user_enable_single_step(child);
|
|
/* give it a chance to run. */
|
|
wake_up_process(child);
|
|
return 0;
|
|
|
|
/* Do requests that differ for 31/64 bit */
|
|
default:
|
|
#ifdef CONFIG_COMPAT
|
|
if (test_thread_flag(TIF_31BIT))
|
|
return do_ptrace_emu31(child, request, addr, data);
|
|
#endif
|
|
return do_ptrace_normal(child, request, addr, data);
|
|
}
|
|
/* Not reached. */
|
|
return -EIO;
|
|
}
|
|
|
|
asmlinkage long
|
|
sys_ptrace(long request, long pid, long addr, long data)
|
|
{
|
|
struct task_struct *child;
|
|
int ret;
|
|
|
|
lock_kernel();
|
|
if (request == PTRACE_TRACEME) {
|
|
ret = ptrace_traceme();
|
|
goto out;
|
|
}
|
|
|
|
child = ptrace_get_task_struct(pid);
|
|
if (IS_ERR(child)) {
|
|
ret = PTR_ERR(child);
|
|
goto out;
|
|
}
|
|
|
|
ret = do_ptrace(child, request, addr, data);
|
|
put_task_struct(child);
|
|
out:
|
|
unlock_kernel();
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage void
|
|
syscall_trace(struct pt_regs *regs, int entryexit)
|
|
{
|
|
if (unlikely(current->audit_context) && entryexit)
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]);
|
|
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
goto out;
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
goto out;
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
|
|
? 0x80 : 0));
|
|
|
|
/*
|
|
* If the debuffer has set an invalid system call number,
|
|
* we prepare to skip the system call restart handling.
|
|
*/
|
|
if (!entryexit && regs->gprs[2] >= NR_syscalls)
|
|
regs->trap = -1;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
out:
|
|
if (unlikely(current->audit_context) && !entryexit)
|
|
audit_syscall_entry(test_thread_flag(TIF_31BIT)?AUDIT_ARCH_S390:AUDIT_ARCH_S390X,
|
|
regs->gprs[2], regs->orig_gpr2, regs->gprs[3],
|
|
regs->gprs[4], regs->gprs[5]);
|
|
}
|
|
|