NetBSD-5.0.2/sys/compat/linux/arch/arm/linux_ptrace.c
/* $NetBSD: linux_ptrace.c,v 1.13 2008/04/28 20:23:42 martin Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_ptrace.c,v 1.13 2008/04/28 20:23:42 martin Exp $");
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/systm.h>
#include <sys/syscallargs.h>
#include <uvm/uvm_extern.h>
#include <machine/reg.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_ptrace.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/common/linux_emuldata.h>
#include <compat/linux/common/linux_exec.h> /* for emul_linux */
#include <compat/linux/linux_syscallargs.h>
#include <lib/libkern/libkern.h> /* for offsetof() */
/*
* On ARMv2, uregs contains R0--R15, orig_R0.
* On ARMv3 and later, it's R0--R15, CPSR, orig_R0.
* As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we
* just produce the ARMv3 version.
*/
struct linux_reg {
long uregs[18];
};
#define LINUX_REG_R0 0
#define LINUX_REG_R1 1
#define LINUX_REG_R2 2
#define LINUX_REG_R3 3
#define LINUX_REG_R4 4
#define LINUX_REG_R5 5
#define LINUX_REG_R6 6
#define LINUX_REG_R7 7
#define LINUX_REG_R8 8
#define LINUX_REG_R9 9
#define LINUX_REG_R10 10
#define LINUX_REG_FP 11
#define LINUX_REG_IP 12
#define LINUX_REG_SP 13
#define LINUX_REG_LR 14
#define LINUX_REG_PC 15
#define LINUX_REG_CPSR 16
#define LINUX_REG_ORIG_R0 17
int linux_ptrace_disabled = 1; /* bitrotted */
int
linux_sys_ptrace_arch(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval)
{
/* {
syscallarg(int) request;
syscallarg(int) pid;
syscallarg(int) addr;
syscallarg(int) data;
} */
struct proc *p = l->l_proc;
int request, error;
struct proc *t; /* target process */
struct lwp *lt;
struct reg *regs = NULL;
struct fpreg *fpregs = NULL;
struct linux_reg *linux_regs = NULL;
struct linux_fpreg *linux_fpregs = NULL;
if (linux_ptrace_disabled)
return ENOSYS;
request = SCARG(uap, request);
if ((request != LINUX_PTRACE_GETREGS) &&
(request != LINUX_PTRACE_SETREGS))
return EIO;
/* Find the process we're supposed to be operating on. */
if ((t = pfind(SCARG(uap, pid))) == NULL)
return ESRCH;
/*
* You can't do what you want to the process if:
* (1) It's not being traced at all,
*/
if (!ISSET(t->p_slflag, PSL_TRACED))
return EPERM;
/*
* (2) it's being traced by procfs (which has
* different signal delivery semantics),
*/
if (ISSET(t->p_slflag, PSL_FSTRACE))
return EBUSY;
/*
* (3) it's not being traced by _you_, or
*/
if (t->p_pptr != p)
return EBUSY;
/*
* (4) it's not currently stopped.
*/
if (t->p_stat != SSTOP || !t->p_waited)
return EBUSY;
/* XXX NJWLWP
* The entire ptrace interface needs work to be useful to
* a process with multiple LWPs. For the moment, we'll
* just kluge this and fail on others.
*/
if (p->p_nlwps > 1)
return (ENOSYS);
lt = LIST_FIRST(&t->p_lwps);
*retval = 0;
switch (request) {
case LINUX_PTRACE_GETREGS:
MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg),
M_TEMP, M_WAITOK);
error = process_read_regs(lt, regs);
if (error != 0)
goto out;
memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t));
linux_regs->uregs[LINUX_REG_SP] = regs->r_sp;
linux_regs->uregs[LINUX_REG_LR] = regs->r_lr;
linux_regs->uregs[LINUX_REG_PC] = regs->r_pc;
linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr;
linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0];
error = copyout(linux_regs, (void *)SCARG(uap, data),
sizeof(struct linux_reg));
goto out;
case LINUX_PTRACE_SETREGS:
MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg),
M_TEMP, M_WAITOK);
error = copyin((void *)SCARG(uap, data), linux_regs,
sizeof(struct linux_reg));
if (error != 0)
goto out;
memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t));
regs->r_sp = linux_regs->uregs[LINUX_REG_SP];
regs->r_lr = linux_regs->uregs[LINUX_REG_LR];
regs->r_pc = linux_regs->uregs[LINUX_REG_PC];
regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR];
error = process_write_regs(lt, regs);
goto out;
default:
/* never reached */
break;
}
return EIO;
out:
if (regs)
FREE(regs, M_TEMP);
if (fpregs)
FREE(fpregs, M_TEMP);
if (linux_regs)
FREE(linux_regs, M_TEMP);
if (linux_fpregs)
FREE(linux_fpregs, M_TEMP);
return (error);
}