317 lines
9.1 KiB
C
317 lines
9.1 KiB
C
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/* $NetBSD: linux_ptrace.c,v 1.1 2001/01/19 01:36:51 manu Exp $ */
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/*-
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* Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthias Scheler and Emmanuel Dreyfus.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Function linux_sys_ptrace_arch() is taken from NetBSD/i386
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* with some stuff deleted to get it compiling. It is not expected to
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* work, and it should be checked with care or re-writen.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/ptrace.h>
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#include <sys/systm.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_extern.h>
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#include <machine/reg.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_ptrace.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/common/linux_emuldata.h>
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#include <compat/linux/common/linux_exec.h> /* for emul_linux */
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#include <compat/linux/linux_syscallargs.h>
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#include <lib/libkern/libkern.h> /* for offsetof() */
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/*
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* From Linux's include/asm-ppc/ptrace.h.
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* structure used for storing reg context: defined in linux_machdep.h
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* structure used for storing floating point context:
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* Linux just uses a double fpr[32], no struct
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*/
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/*
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* user struct for linux process - this is used for Linux ptrace emulation
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* most of it is junk only used by gdb
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*
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* From Linux's include/asm-ppc/user.h
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*
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* XXX u_ar0 was a struct reg in Linux/powerpc
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* Can't find out what a struct regs is for Linux/powerpc,
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* so we use a struct pt_regs instead. don't know if this is right.
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*/
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struct linux_user {
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struct linux_pt_regs regs;
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size_t u_tsize;
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size_t u_dsize;
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size_t u_ssize;
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unsigned long start_code;
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unsigned long start_data;
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unsigned long start_stack;
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long int signal;
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struct linux_pt_regs *u_ar0; /* help gdb find registers */
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unsigned long magic;
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char u_comm[32];
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};
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#define lusr_startgdb regs
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#define LUSR_OFF(member) offsetof(struct linux_user, member)
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#define ISSET(t, f) ((t) & (f))
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int
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linux_sys_ptrace_arch(p, v, retval) /* XXX Check me! (From NetBSD/i386) */
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_ptrace_args /* {
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syscallarg(int) request;
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syscallarg(int) pid;
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syscallarg(int) addr;
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syscallarg(int) data;
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} */ *uap = v;
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int request, error;
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struct proc *t; /* target process */
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struct reg *regs = NULL;
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struct fpreg *fpregs = NULL;
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struct linux_pt_regs *linux_regs = NULL;
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double *linux_fpreg=NULL; /* it's an array, not a struct */
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int addr;
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int i;
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request = SCARG(uap, request);
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if ((request != LINUX_PTRACE_PEEKUSR) &&
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(request != LINUX_PTRACE_POKEUSR) &&
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(request != LINUX_PTRACE_GETREGS) &&
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(request != LINUX_PTRACE_SETREGS) &&
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(request != LINUX_PTRACE_GETFPREGS) &&
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(request != LINUX_PTRACE_SETFPREGS))
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return EIO;
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/* Find the process we're supposed to be operating on. */
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if ((t = pfind(SCARG(uap, pid))) == NULL)
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return ESRCH;
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/*
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* You can't do what you want to the process if:
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* (1) It's not being traced at all,
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*/
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if (!ISSET(t->p_flag, P_TRACED))
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return EPERM;
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/*
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* (2) it's being traced by procfs (which has
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* different signal delivery semantics),
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*/
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if (ISSET(t->p_flag, P_FSTRACE))
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return EBUSY;
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/*
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* (3) it's not being traced by _you_, or
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*/
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if (t->p_pptr != p)
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return EBUSY;
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/*
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* (4) it's not currently stopped.
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*/
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if (t->p_stat != SSTOP || !ISSET(t->p_flag, P_WAITED))
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return EBUSY;
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*retval = 0;
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switch (request) {
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case LINUX_PTRACE_GETREGS:
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MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
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MALLOC(linux_regs, struct linux_pt_regs*, sizeof(struct linux_pt_regs),
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M_TEMP, M_WAITOK);
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error = process_read_regs(t, regs);
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if (error != 0)
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goto out;
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for (i=0; i<=31; i++)
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linux_regs->lgpr[i] = regs->fixreg[i];
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linux_regs->lnip = regs->pc;
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linux_regs->lmsr = 0;
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linux_regs->lorig_gpr3 = regs->fixreg[3]; /* XXX Is that right? */
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linux_regs->lctr = regs->ctr;
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linux_regs->llink = regs->lr;
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linux_regs->lxer = regs->xer;
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linux_regs->lccr = regs->cr;
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linux_regs->lmq = 0;
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linux_regs->ltrap = 0;
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linux_regs->ldar = 0;
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linux_regs->ldsisr = 0;
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linux_regs->lresult = 0;
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error = copyout(linux_regs, (caddr_t)SCARG(uap, data),
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sizeof(struct linux_pt_regs));
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goto out;
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case LINUX_PTRACE_SETREGS:
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MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
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MALLOC(linux_regs, struct linux_pt_regs*, sizeof(struct linux_pt_regs),
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M_TEMP, M_WAITOK);
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error = copyin((caddr_t)SCARG(uap, data), linux_regs,
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sizeof(struct linux_pt_regs));
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if (error != 0)
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goto out;
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for (i=0; i<=31; i++)
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regs->fixreg[i] = linux_regs->lgpr[i];
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regs->lr = linux_regs->llink;
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regs->cr = linux_regs->lccr;
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regs->xer = linux_regs->lxer;
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regs->ctr = linux_regs->lctr;
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regs->pc = 0; /* XXX obviously this won't work ;o) */
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error = process_write_regs(t, regs);
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goto out;
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case LINUX_PTRACE_GETFPREGS:
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MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
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M_TEMP, M_WAITOK);
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MALLOC(linux_fpreg, double *,
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32*sizeof(double), M_TEMP, M_WAITOK);
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error = process_read_fpregs(t, fpregs);
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if (error != 0)
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goto out;
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/* zero the contents if NetBSD fpreg structure is smaller */
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if (sizeof(struct fpreg) < (32*sizeof(double)))
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memset(linux_fpreg, '\0', (32*sizeof(double)));
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memcpy(linux_fpreg, fpregs,
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min(32*sizeof(double), sizeof(struct fpreg)));
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error = copyout(linux_fpreg, (caddr_t)SCARG(uap, data),
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32*sizeof(double));
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goto out;
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case LINUX_PTRACE_SETFPREGS:
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MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
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M_TEMP, M_WAITOK);
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MALLOC(linux_fpreg, double *,
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32*sizeof(double), M_TEMP, M_WAITOK);
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error = copyin((caddr_t)SCARG(uap, data), linux_fpreg,
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32*sizeof(double));
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if (error != 0)
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goto out;
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memset(fpregs, '\0', sizeof(struct fpreg));
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memcpy(fpregs, linux_fpreg,
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min(32*sizeof(double), sizeof(struct fpreg)));
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error = process_write_regs(t, regs);
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goto out;
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case LINUX_PTRACE_PEEKUSR:
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addr = SCARG(uap, addr);
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PHOLD(t); /* need full process info */
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error = 0;
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if (addr < LUSR_OFF(lusr_startgdb)) {
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error = 1;
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} else if (addr == LUSR_OFF(u_tsize))
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*retval = p->p_vmspace->vm_tsize;
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else if (addr == LUSR_OFF(u_dsize))
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*retval = p->p_vmspace->vm_dsize;
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else if (addr == LUSR_OFF(u_ssize))
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*retval = p->p_vmspace->vm_ssize;
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else if (addr == LUSR_OFF(start_code))
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*retval = (register_t) p->p_vmspace->vm_taddr;
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else if (addr == LUSR_OFF(start_stack))
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*retval = (register_t) p->p_vmspace->vm_minsaddr;
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else if (addr == LUSR_OFF(u_ar0))
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*retval = LUSR_OFF(regs);
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else if (addr == LUSR_OFF(signal)) {
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error = 1;
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} else if (addr == LUSR_OFF(signal)) {
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error = 1;
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} else if (addr == LUSR_OFF(magic)) {
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error = 1;
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} else if (addr == LUSR_OFF(u_comm)) {
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error = 1;
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} else {
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#ifdef DEBUG_LINUX
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printf("linux_ptrace: unsupported address: %d\n", addr);
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#endif
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error = 1;
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}
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PRELE(t);
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if (!error)
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return 0;
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case LINUX_PTRACE_POKEUSR:
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/* XXX We don't do much yet... */
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addr = SCARG(uap, addr);
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break;
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default:
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/* never reached */
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break;
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}
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return EIO;
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out:
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if (regs)
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FREE(regs, M_TEMP);
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if (fpregs)
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FREE(fpregs, M_TEMP);
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if (linux_regs)
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FREE(linux_regs, M_TEMP);
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if (linux_fpreg)
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FREE(linux_fpreg, M_TEMP);
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return (error);
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}
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