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NetBSD/sys/compat/linux/arch/powerpc/linux_ptrace.c

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/* $NetBSD: linux_ptrace.c,v 1.21 2008/12/17 20:51:33 cegger Exp $ */
/*-
* Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler and Emmanuel Dreyfus.
*
* 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 1.21 2008/12/17 20:51:33 cegger 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() */
/*
* From Linux's include/asm-ppc/ptrace.h.
* structure used for storing reg context: defined in linux_machdep.h
* structure used for storing floating point context:
* Linux just uses a double fpr[32], no struct
*/
/*
* user struct for linux process - this is used for Linux ptrace emulation
* most of it is junk only used by gdb
*
* From Linux's include/asm-ppc/user.h
*
* XXX u_ar0 was a struct reg in Linux/powerpc
* Can't find out what a struct regs is for Linux/powerpc,
* so we use a struct pt_regs instead. don't know if this is right.
*/
struct linux_user {
struct linux_pt_regs regs;
#define lusr_startgdb regs
size_t u_tsize;
size_t u_dsize;
size_t u_ssize;
unsigned long start_code;
unsigned long start_data;
unsigned long start_stack;
long int signal;
struct linux_pt_regs *u_ar0; /* help gdb find registers */
unsigned long magic;
char u_comm[32];
#define lu_comm_end u_comm[31]
};
#define LUSR_OFF(member) offsetof(struct linux_user, member)
#define LUSR_REG_OFF(member) offsetof(struct linux_pt_regs, member)
#define ISSET(t, f) ((t) & (f))
int linux_ptrace_disabled = 1; /* bitrotted */
/* XXX Check me! (From NetBSD/i386) */
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;
} */
int request, error;
struct proc *p = l->l_proc;
struct proc *t; /* target process */
struct lwp *lt;
struct reg *regs = NULL;
struct fpreg *fpregs = NULL;
struct linux_pt_regs *linux_regs = NULL;
double *linux_fpreg = NULL; /* it's an array, not a struct */
int addr;
int i;
if (linux_ptrace_disabled)
return ENOSYS;
switch (request = SCARG(uap, request)) {
case LINUX_PTRACE_PEEKUSR:
case LINUX_PTRACE_POKEUSR:
case LINUX_PTRACE_GETREGS:
case LINUX_PTRACE_SETREGS:
case LINUX_PTRACE_GETFPREGS:
case LINUX_PTRACE_SETFPREGS:
break;
default:
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)) /* XXXSMP */
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;
lt = LIST_FIRST(&t->p_lwps);
*retval = 0;
switch (request) {
case LINUX_PTRACE_GETREGS:
regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK);
linux_regs = malloc(sizeof(*linux_regs), M_TEMP, M_WAITOK);
error = process_read_regs(lt, regs);
if (error != 0)
goto out;
for (i=0; i<=31; i++)
linux_regs->lgpr[i] = regs->fixreg[i];
linux_regs->lnip = regs->pc;
linux_regs->lmsr = 0;
/* XXX Is that right? */
linux_regs->lorig_gpr3 = regs->fixreg[3];
linux_regs->lctr = regs->ctr;
linux_regs->llink = regs->lr;
linux_regs->lxer = regs->xer;
linux_regs->lccr = regs->cr;
linux_regs->lmq = 0;
linux_regs->ltrap = 0;
linux_regs->ldar = 0;
linux_regs->ldsisr = 0;
linux_regs->lresult = 0;
error = copyout(linux_regs, (void *)SCARG(uap, data),
sizeof(struct linux_pt_regs));
goto out;
case LINUX_PTRACE_SETREGS:
regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK);
linux_regs = malloc(sizeof(*linux_regs), M_TEMP, M_WAITOK);
error = copyin((void *)SCARG(uap, data), linux_regs,
sizeof(struct linux_pt_regs));
if (error != 0)
goto out;
for (i=0; i<=31; i++)
regs->fixreg[i] = linux_regs->lgpr[i];
regs->lr = linux_regs->llink;
regs->cr = linux_regs->lccr;
regs->xer = linux_regs->lxer;
regs->ctr = linux_regs->lctr;
regs->pc = linux_regs->lnip; /* XXX */
error = process_write_regs(lt, regs);
goto out;
case LINUX_PTRACE_GETFPREGS:
fpregs = malloc(sizeof(struct fpreg), M_TEMP, M_WAITOK);
linux_fpreg = malloc(32*sizeof(double), M_TEMP, M_WAITOK);
error = process_read_fpregs(lt, fpregs);
if (error != 0)
goto out;
/* zero the contents if NetBSD fpreg structure is smaller */
if (sizeof(struct fpreg) < (32*sizeof(double)))
memset(linux_fpreg, '\0', (32*sizeof(double)));
memcpy(linux_fpreg, fpregs,
min(32*sizeof(double), sizeof(struct fpreg)));
error = copyout(linux_fpreg, (void *)SCARG(uap, data),
32*sizeof(double));
goto out;
case LINUX_PTRACE_SETFPREGS:
fpregs = malloc(sizeof(struct fpreg), M_TEMP, M_WAITOK);
linux_fpreg = malloc(32*sizeof(double), M_TEMP, M_WAITOK);
error = copyin((void *)SCARG(uap, data), linux_fpreg,
32*sizeof(double));
if (error != 0)
goto out;
memset(fpregs, '\0', sizeof(struct fpreg));
memcpy(fpregs, linux_fpreg,
min(32*sizeof(double), sizeof(struct fpreg)));
error = process_write_fpregs(lt, fpregs);
goto out;
case LINUX_PTRACE_PEEKUSR:
addr = SCARG(uap, addr);
regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK);
error = process_read_regs(lt, regs);
if (error)
goto out;
uvm_lwp_hold(lt); /* need full process info */
error = 0;
if ((addr < LUSR_OFF(lusr_startgdb)) ||
(addr > LUSR_OFF(lu_comm_end)))
error = 1;
else if (addr == LUSR_OFF(u_tsize))
*retval = p->p_vmspace->vm_tsize;
else if (addr == LUSR_OFF(u_dsize))
*retval = p->p_vmspace->vm_dsize;
else if (addr == LUSR_OFF(u_ssize))
*retval = p->p_vmspace->vm_ssize;
else if (addr == LUSR_OFF(start_code))
*retval = (register_t) p->p_vmspace->vm_taddr;
else if (addr == LUSR_OFF(start_stack))
*retval = (register_t) p->p_vmspace->vm_minsaddr;
else if ((addr >= LUSR_REG_OFF(lpt_regs_fixreg_begin)) &&
(addr <= LUSR_REG_OFF(lpt_regs_fixreg_end)))
*retval = regs->fixreg[addr / sizeof (register_t)];
else if (addr == LUSR_REG_OFF(lnip))
*retval = regs->pc;
else if (addr == LUSR_REG_OFF(lctr))
*retval = regs->ctr;
else if (addr == LUSR_REG_OFF(llink))
*retval = regs->lr;
else if (addr == LUSR_REG_OFF(lxer))
*retval = regs->xer;
else if (addr == LUSR_REG_OFF(lccr))
*retval = regs->cr;
else if (addr == LUSR_OFF(signal))
error = 1;
else if (addr == LUSR_OFF(signal))
error = 1;
else if (addr == LUSR_OFF(magic))
error = 1;
else if (addr == LUSR_OFF(u_comm))
error = 1;
else {
#ifdef DEBUG_LINUX
printf("linux_ptrace: unsupported address: %d\n", addr);
#endif
error = 1;
}
uvm_lwp_rele(lt);
if (error)
goto out;
error = copyout (retval,
(void *)SCARG(uap, data), sizeof retval);
*retval = SCARG(uap, data);
goto out;
break;
case LINUX_PTRACE_POKEUSR: /* XXX Not tested */
addr = SCARG(uap, addr);
regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK);
error = process_read_regs(lt, regs);
if (error)
goto out;
uvm_lwp_hold(lt); /* need full process info */
error = 0;
if ((addr < LUSR_OFF(lusr_startgdb)) ||
(addr > LUSR_OFF(lu_comm_end)))
error = 1;
else if (addr == LUSR_OFF(u_tsize))
error = 1;
else if (addr == LUSR_OFF(u_dsize))
error = 1;
else if (addr == LUSR_OFF(u_ssize))
error = 1;
else if (addr == LUSR_OFF(start_code))
error = 1;
else if (addr == LUSR_OFF(start_stack))
error = 1;
else if ((addr >= LUSR_REG_OFF(lpt_regs_fixreg_begin)) &&
(addr <= LUSR_REG_OFF(lpt_regs_fixreg_end)))
regs->fixreg[addr / sizeof (register_t)] =
(register_t)SCARG(uap, data);
else if (addr == LUSR_REG_OFF(lnip))
regs->pc = (register_t)SCARG(uap, data);
else if (addr == LUSR_REG_OFF(lctr))
regs->ctr = (register_t)SCARG(uap, data);
else if (addr == LUSR_REG_OFF(llink))
regs->lr = (register_t)SCARG(uap, data);
else if (addr == LUSR_REG_OFF(lxer))
regs->xer = (register_t)SCARG(uap, data);
else if (addr == LUSR_REG_OFF(lccr))
regs->cr = (register_t)SCARG(uap, data);
else if (addr == LUSR_OFF(signal))
error = 1;
else if (addr == LUSR_OFF(magic))
error = 1;
else if (addr == LUSR_OFF(u_comm))
error = 1;
else {
#ifdef DEBUG_LINUX
printf("linux_ptrace: unsupported address: %d\n", addr);
#endif
error = 1;
}
uvm_lwp_rele(lt);
error = process_write_regs(lt,regs);
if (error)
goto out;
break;
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_fpreg)
free(linux_fpreg, M_TEMP);
return (error);
}
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