386 lines
11 KiB
C
386 lines
11 KiB
C
/* $NetBSD: linux_ptrace.c,v 1.20 2007/12/20 23:02:52 dsl 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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 1.20 2007/12/20 23:02:52 dsl 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/syscall.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() */
|
|
|
|
struct linux_reg {
|
|
long ebx;
|
|
long ecx;
|
|
long edx;
|
|
long esi;
|
|
long edi;
|
|
long ebp;
|
|
long eax;
|
|
long xds, xes; /* unsigned short ds, __ds, es, __es; */
|
|
long __fs, __gs; /* unsigned short fs, __fs, gs, __gs; */
|
|
long orig_eax;
|
|
long eip;
|
|
long xcs; /* unsigned short cs, __cs; */
|
|
long eflags;
|
|
long esp;
|
|
long xss; /* unsigned short ss, __ss; */
|
|
};
|
|
|
|
/* structure used for storing floating point context */
|
|
struct linux_fpctx {
|
|
long cwd;
|
|
long swd;
|
|
long twd;
|
|
long fip;
|
|
long fcs;
|
|
long foo;
|
|
long fos;
|
|
long st_space[20];
|
|
};
|
|
|
|
/* user struct for linux process - this is used for Linux ptrace emulation */
|
|
/* most of it is junk only used by gdb */
|
|
struct linux_user {
|
|
struct linux_reg regs; /* registers */
|
|
int u_fpvalid; /* true if math co-processor being used. */
|
|
struct linux_fpctx i387; /* Math Co-processor registers. */
|
|
/* The rest of this junk is to help gdb figure out what goes where */
|
|
#define lusr_startgdb u_tsize
|
|
unsigned long int u_tsize; /* Text segment size (pages). */
|
|
unsigned long int u_dsize; /* Data segment size (pages). */
|
|
unsigned long int u_ssize; /* Stack segment size (pages). */
|
|
unsigned long start_code; /* Starting virtual address of text. */
|
|
unsigned long start_stack; /* Starting virtual address of stack
|
|
area. This is actually the bottom of
|
|
the stack, the top of the stack is
|
|
always found in the esp register. */
|
|
long int __signal; /* Signal that caused the core dump. */
|
|
int __reserved; /* unused */
|
|
void *u_ar0; /* Used by gdb to help find the values
|
|
for the registers. */
|
|
struct linux_fpctx *u_fpstate; /* Math Co-processor pointer. */
|
|
unsigned long __magic; /* To uniquely identify a core file */
|
|
char u_comm[32]; /* User command that was responsible */
|
|
int u_debugreg[8];
|
|
#define u_debugreg_end u_debugreg[7]
|
|
};
|
|
|
|
#define LUSR_OFF(member) offsetof(struct linux_user, member)
|
|
#define ISSET(t, f) ((t) & (f))
|
|
|
|
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_fpctx *linux_fpregs = NULL;
|
|
int addr;
|
|
|
|
request = SCARG(uap, request);
|
|
|
|
if ((request != LINUX_PTRACE_PEEKUSR) &&
|
|
(request != LINUX_PTRACE_POKEUSR) &&
|
|
(request != LINUX_PTRACE_GETREGS) &&
|
|
(request != LINUX_PTRACE_SETREGS) &&
|
|
(request != LINUX_PTRACE_GETFPREGS) &&
|
|
(request != LINUX_PTRACE_SETFPREGS))
|
|
return EIO;
|
|
|
|
/* XXXAD locking */
|
|
|
|
/* 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 /* XXXSMP */)
|
|
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;
|
|
|
|
linux_regs->ebx = regs->r_ebx;
|
|
linux_regs->ecx = regs->r_ecx;
|
|
linux_regs->edx = regs->r_edx;
|
|
linux_regs->esi = regs->r_esi;
|
|
linux_regs->edi = regs->r_edi;
|
|
linux_regs->ebp = regs->r_ebp;
|
|
linux_regs->eax = regs->r_eax;
|
|
linux_regs->xds = regs->r_ds;
|
|
linux_regs->xes = regs->r_es;
|
|
linux_regs->orig_eax = regs->r_eax; /* XXX is this correct? */
|
|
linux_regs->eip = regs->r_cs + regs->r_eip;
|
|
linux_regs->xcs = regs->r_cs;
|
|
linux_regs->eflags = regs->r_eflags;
|
|
linux_regs->esp = regs->r_esp;
|
|
linux_regs->xss = regs->r_ss;
|
|
|
|
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;
|
|
|
|
regs->r_ebx = linux_regs->ebx;
|
|
regs->r_ecx = linux_regs->ecx;
|
|
regs->r_edx = linux_regs->edx;
|
|
regs->r_esi = linux_regs->esi;
|
|
regs->r_edi = linux_regs->edi;
|
|
regs->r_ebp = linux_regs->ebp;
|
|
regs->r_eax = linux_regs->eax;
|
|
regs->r_ds = linux_regs->xds;
|
|
regs->r_es = linux_regs->xes;
|
|
regs->r_eip = linux_regs->eip - linux_regs->xcs;
|
|
regs->r_cs = linux_regs->xcs;
|
|
regs->r_eflags = linux_regs->eflags;
|
|
regs->r_esp = linux_regs->esp;
|
|
regs->r_ss = linux_regs->xss;
|
|
|
|
error = process_write_regs(lt, regs);
|
|
goto out;
|
|
|
|
case LINUX_PTRACE_GETFPREGS:
|
|
MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
|
|
M_TEMP, M_WAITOK);
|
|
MALLOC(linux_fpregs, struct linux_fpctx *,
|
|
sizeof(struct linux_fpctx), 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) < sizeof(struct linux_fpctx))
|
|
memset(linux_fpregs, '\0', sizeof(struct linux_fpctx));
|
|
|
|
memcpy(linux_fpregs, fpregs,
|
|
min(sizeof(struct linux_fpctx), sizeof(struct fpreg)));
|
|
error = copyout(linux_fpregs, (void *)SCARG(uap, data),
|
|
sizeof(struct linux_fpctx));
|
|
goto out;
|
|
|
|
case LINUX_PTRACE_SETFPREGS:
|
|
MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
|
|
M_TEMP, M_WAITOK);
|
|
MALLOC(linux_fpregs, struct linux_fpctx *,
|
|
sizeof(struct linux_fpctx), M_TEMP, M_WAITOK);
|
|
error = copyin((void *)SCARG(uap, data), linux_fpregs,
|
|
sizeof(struct linux_fpctx));
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
memset(fpregs, '\0', sizeof(struct fpreg));
|
|
memcpy(fpregs, linux_fpregs,
|
|
min(sizeof(struct linux_fpctx), sizeof(struct fpreg)));
|
|
|
|
error = process_write_regs(lt, regs);
|
|
goto out;
|
|
|
|
case LINUX_PTRACE_PEEKUSR:
|
|
addr = SCARG(uap, addr);
|
|
|
|
uvm_lwp_hold(lt); /* need full process info */
|
|
error = 0;
|
|
if (addr < LUSR_OFF(lusr_startgdb)) {
|
|
/* XXX should provide appropriate register */
|
|
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_OFF(u_ar0))
|
|
*retval = LUSR_OFF(regs);
|
|
else if (addr >= LUSR_OFF(u_debugreg)
|
|
&& addr <= LUSR_OFF(u_debugreg_end)) {
|
|
int off = (addr - LUSR_OFF(u_debugreg)) / sizeof(int);
|
|
|
|
/* only do this for Linux processes */
|
|
if (t->p_emul != &emul_linux)
|
|
error = EINVAL;
|
|
else {
|
|
*retval = ((struct linux_emuldata *)
|
|
t->p_emuldata)->debugreg[off];
|
|
}
|
|
} else if (addr == LUSR_OFF(__signal)) {
|
|
error = 1;
|
|
} else if (addr == LUSR_OFF(__signal)) {
|
|
error = 1;
|
|
} else if (addr == LUSR_OFF(u_fpstate)) {
|
|
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)
|
|
return 0;
|
|
|
|
case LINUX_PTRACE_POKEUSR:
|
|
/* we only support setting debugregs for now */
|
|
addr = SCARG(uap, addr);
|
|
if (addr >= LUSR_OFF(u_debugreg)
|
|
&& addr <= LUSR_OFF(u_debugreg_end)) {
|
|
int off = (addr - LUSR_OFF(u_debugreg)) / sizeof(int);
|
|
int data = SCARG(uap, data);
|
|
|
|
/* only do this for Linux processes */
|
|
if (t->p_emul != &emul_linux)
|
|
return EINVAL;
|
|
|
|
uvm_lwp_hold(lt);
|
|
((struct linux_emuldata *)t->p_emuldata)->debugreg[off] = data;
|
|
uvm_lwp_rele(lt);
|
|
return (0);
|
|
}
|
|
|
|
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_fpregs)
|
|
FREE(linux_fpregs, M_TEMP);
|
|
return (error);
|
|
}
|