226 lines
6.4 KiB
C
226 lines
6.4 KiB
C
/* $NetBSD: linux_ptrace.c,v 1.9 2007/03/04 06:01:19 christos Exp $ */
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/*-
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* Copyright (c) 1999 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.
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: linux_ptrace.c,v 1.9 2007/03/04 06:01:19 christos Exp $");
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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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* On ARMv2, uregs contains R0--R15, orig_R0.
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* On ARMv3 and later, it's R0--R15, CPSR, orig_R0.
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* As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we
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* just produce the ARMv3 version.
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*/
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struct linux_reg {
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long uregs[18];
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};
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#define LINUX_REG_R0 0
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#define LINUX_REG_R1 1
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#define LINUX_REG_R2 2
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#define LINUX_REG_R3 3
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#define LINUX_REG_R4 4
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#define LINUX_REG_R5 5
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#define LINUX_REG_R6 6
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#define LINUX_REG_R7 7
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#define LINUX_REG_R8 8
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#define LINUX_REG_R9 9
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#define LINUX_REG_R10 10
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#define LINUX_REG_FP 11
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#define LINUX_REG_IP 12
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#define LINUX_REG_SP 13
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#define LINUX_REG_LR 14
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#define LINUX_REG_PC 15
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#define LINUX_REG_CPSR 16
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#define LINUX_REG_ORIG_R0 17
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int
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linux_sys_ptrace_arch(l, v, retval)
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struct lwp *l;
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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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struct proc *p = l->l_proc;
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int request, error;
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struct proc *t; /* target process */
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struct lwp *lt;
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struct reg *regs = NULL;
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struct fpreg *fpregs = NULL;
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struct linux_reg *linux_regs = NULL;
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struct linux_fpreg *linux_fpregs = NULL;
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request = SCARG(uap, request);
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if ((request != LINUX_PTRACE_GETREGS) &&
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(request != LINUX_PTRACE_SETREGS))
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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_slflag, PSL_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_slflag, PSL_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 || !t->p_waited)
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return EBUSY;
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/* XXX NJWLWP
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* The entire ptrace interface needs work to be useful to
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* a process with multiple LWPs. For the moment, we'll
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* just kluge this and fail on others.
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*/
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if (p->p_nlwps > 1)
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return (ENOSYS);
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lt = LIST_FIRST(&t->p_lwps);
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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_reg*, sizeof(struct linux_reg),
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M_TEMP, M_WAITOK);
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error = process_read_regs(lt, regs);
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if (error != 0)
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goto out;
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memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t));
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linux_regs->uregs[LINUX_REG_SP] = regs->r_sp;
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linux_regs->uregs[LINUX_REG_LR] = regs->r_lr;
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linux_regs->uregs[LINUX_REG_PC] = regs->r_pc;
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linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr;
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linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0];
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error = copyout(linux_regs, (void *)SCARG(uap, data),
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sizeof(struct linux_reg));
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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_reg *, sizeof(struct linux_reg),
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M_TEMP, M_WAITOK);
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error = copyin((void *)SCARG(uap, data), linux_regs,
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sizeof(struct linux_reg));
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if (error != 0)
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goto out;
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memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t));
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regs->r_sp = linux_regs->uregs[LINUX_REG_SP];
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regs->r_lr = linux_regs->uregs[LINUX_REG_LR];
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regs->r_pc = linux_regs->uregs[LINUX_REG_PC];
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regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR];
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error = process_write_regs(lt, regs);
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goto out;
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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_fpregs)
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FREE(linux_fpregs, M_TEMP);
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return (error);
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}
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