/
process.c
3732 lines (3526 loc) · 92.7 KB
/
process.c
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
* Copyright (c) 2000 PocketPenguins Inc. Linux for Hitachi SuperH
* port by Greg Banks <gbanks@pocketpenguins.com>
*
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id$
*/
#include "defs.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <sys/user.h>
#include <sys/syscall.h>
#include <signal.h>
#ifdef SUNOS4
#include <machine/reg.h>
#endif /* SUNOS4 */
#ifdef FREEBSD
#include <sys/ptrace.h>
#endif
#ifdef HAVE_SYS_REG_H
# include <sys/reg.h>
#ifndef PTRACE_PEEKUSR
# define PTRACE_PEEKUSR PTRACE_PEEKUSER
#endif
#ifndef PTRACE_POKEUSR
# define PTRACE_POKEUSR PTRACE_POKEUSER
#endif
#endif
#ifdef HAVE_LINUX_PTRACE_H
#undef PTRACE_SYSCALL
# ifdef HAVE_STRUCT_IA64_FPREG
# define ia64_fpreg XXX_ia64_fpreg
# endif
# ifdef HAVE_STRUCT_PT_ALL_USER_REGS
# define pt_all_user_regs XXX_pt_all_user_regs
# endif
#include <linux/ptrace.h>
# undef ia64_fpreg
# undef pt_all_user_regs
#endif
#if defined (LINUX) && defined (SPARC64)
# define r_pc r_tpc
# undef PTRACE_GETREGS
# define PTRACE_GETREGS PTRACE_GETREGS64
# undef PTRACE_SETREGS
# define PTRACE_SETREGS PTRACE_SETREGS64
#endif /* LINUX && SPARC64 */
#ifdef HAVE_LINUX_FUTEX_H
#include <linux/futex.h>
#endif
#if defined LINUX
# ifndef FUTEX_WAIT
# define FUTEX_WAIT 0
# endif
# ifndef FUTEX_WAKE
# define FUTEX_WAKE 1
# endif
# ifndef FUTEX_FD
# define FUTEX_FD 2
# endif
# ifndef FUTEX_REQUEUE
# define FUTEX_REQUEUE 3
# endif
#endif
#ifdef LINUX
#include <sched.h>
#include <asm/posix_types.h>
#undef GETGROUPS_T
#define GETGROUPS_T __kernel_gid_t
#undef GETGROUPS32_T
#define GETGROUPS32_T __kernel_gid32_t
#endif /* LINUX */
#if defined(LINUX) && defined(IA64)
# include <asm/ptrace_offsets.h>
# include <asm/rse.h>
#endif
#ifdef HAVE_PRCTL
#include <sys/prctl.h>
#endif
#ifndef WCOREDUMP
#define WCOREDUMP(status) ((status) & 0200)
#endif
/* WTA: this was `&& !defined(LINUXSPARC)', this seems unneeded though? */
#if defined(HAVE_PRCTL)
static const struct xlat prctl_options[] = {
#ifdef PR_MAXPROCS
{ PR_MAXPROCS, "PR_MAXPROCS" },
#endif
#ifdef PR_ISBLOCKED
{ PR_ISBLOCKED, "PR_ISBLOCKED" },
#endif
#ifdef PR_SETSTACKSIZE
{ PR_SETSTACKSIZE, "PR_SETSTACKSIZE" },
#endif
#ifdef PR_GETSTACKSIZE
{ PR_GETSTACKSIZE, "PR_GETSTACKSIZE" },
#endif
#ifdef PR_MAXPPROCS
{ PR_MAXPPROCS, "PR_MAXPPROCS" },
#endif
#ifdef PR_UNBLKONEXEC
{ PR_UNBLKONEXEC, "PR_UNBLKONEXEC" },
#endif
#ifdef PR_ATOMICSIM
{ PR_ATOMICSIM, "PR_ATOMICSIM" },
#endif
#ifdef PR_SETEXITSIG
{ PR_SETEXITSIG, "PR_SETEXITSIG" },
#endif
#ifdef PR_RESIDENT
{ PR_RESIDENT, "PR_RESIDENT" },
#endif
#ifdef PR_ATTACHADDR
{ PR_ATTACHADDR, "PR_ATTACHADDR" },
#endif
#ifdef PR_DETACHADDR
{ PR_DETACHADDR, "PR_DETACHADDR" },
#endif
#ifdef PR_TERMCHILD
{ PR_TERMCHILD, "PR_TERMCHILD" },
#endif
#ifdef PR_GETSHMASK
{ PR_GETSHMASK, "PR_GETSHMASK" },
#endif
#ifdef PR_GETNSHARE
{ PR_GETNSHARE, "PR_GETNSHARE" },
#endif
#ifdef PR_COREPID
{ PR_COREPID, "PR_COREPID" },
#endif
#ifdef PR_ATTACHADDRPERM
{ PR_ATTACHADDRPERM, "PR_ATTACHADDRPERM" },
#endif
#ifdef PR_PTHREADEXIT
{ PR_PTHREADEXIT, "PR_PTHREADEXIT" },
#endif
#ifdef PR_SET_PDEATHSIG
{ PR_SET_PDEATHSIG, "PR_SET_PDEATHSIG" },
#endif
#ifdef PR_GET_PDEATHSIG
{ PR_GET_PDEATHSIG, "PR_GET_PDEATHSIG" },
#endif
#ifdef PR_GET_DUMPABLE
{ PR_GET_DUMPABLE, "PR_GET_DUMPABLE" },
#endif
#ifdef PR_SET_DUMPABLE
{ PR_SET_DUMPABLE, "PR_SET_DUMPABLE" },
#endif
#ifdef PR_GET_UNALIGN
{ PR_GET_UNALIGN, "PR_GET_UNALIGN" },
#endif
#ifdef PR_SET_UNALIGN
{ PR_SET_UNALIGN, "PR_SET_UNALIGN" },
#endif
#ifdef PR_GET_KEEPCAPS
{ PR_GET_KEEPCAPS, "PR_GET_KEEPCAPS" },
#endif
#ifdef PR_SET_KEEPCAPS
{ PR_SET_KEEPCAPS, "PR_SET_KEEPCAPS" },
#endif
#ifdef PR_GET_FPEMU
{ PR_GET_FPEMU, "PR_GET_FPEMU" },
#endif
#ifdef PR_SET_FPEMU
{ PR_SET_FPEMU, "PR_SET_FPEMU" },
#endif
#ifdef PR_GET_FPEXC
{ PR_GET_FPEXC, "PR_GET_FPEXC" },
#endif
#ifdef PR_SET_FPEXC
{ PR_SET_FPEXC, "PR_SET_FPEXC" },
#endif
#ifdef PR_GET_TIMING
{ PR_GET_TIMING, "PR_GET_TIMING" },
#endif
#ifdef PR_SET_TIMING
{ PR_SET_TIMING, "PR_SET_TIMING" },
#endif
#ifdef PR_SET_NAME
{ PR_SET_NAME, "PR_SET_NAME" },
#endif
#ifdef PR_GET_NAME
{ PR_GET_NAME, "PR_GET_NAME" },
#endif
#ifdef PR_GET_ENDIAN
{ PR_GET_ENDIAN, "PR_GET_ENDIAN" },
#endif
#ifdef PR_SET_ENDIAN
{ PR_SET_ENDIAN, "PR_SET_ENDIAN" },
#endif
#ifdef PR_GET_SECCOMP
{ PR_GET_SECCOMP, "PR_GET_SECCOMP" },
#endif
#ifdef PR_SET_SECCOMP
{ PR_SET_SECCOMP, "PR_SET_SECCOMP" },
#endif
#ifdef PR_GET_TSC
{ PR_GET_TSC, "PR_GET_TSC" },
#endif
#ifdef PR_SET_TSC
{ PR_SET_TSC, "PR_SET_TSC" },
#endif
#ifdef PR_GET_SECUREBITS
{ PR_GET_SECUREBITS, "PR_GET_SECUREBITS" },
#endif
#ifdef PR_SET_SECUREBITS
{ PR_SET_SECUREBITS, "PR_SET_SECUREBITS" },
#endif
{ 0, NULL },
};
static const char *
unalignctl_string (unsigned int ctl)
{
static char buf[16];
switch (ctl) {
#ifdef PR_UNALIGN_NOPRINT
case PR_UNALIGN_NOPRINT:
return "NOPRINT";
#endif
#ifdef PR_UNALIGN_SIGBUS
case PR_UNALIGN_SIGBUS:
return "SIGBUS";
#endif
default:
break;
}
sprintf(buf, "%x", ctl);
return buf;
}
int
sys_prctl(tcp)
struct tcb *tcp;
{
int i;
if (entering(tcp)) {
printxval(prctl_options, tcp->u_arg[0], "PR_???");
switch (tcp->u_arg[0]) {
#ifdef PR_GETNSHARE
case PR_GETNSHARE:
break;
#endif
#ifdef PR_SET_PDEATHSIG
case PR_SET_PDEATHSIG:
tprintf(", %lu", tcp->u_arg[1]);
break;
#endif
#ifdef PR_GET_PDEATHSIG
case PR_GET_PDEATHSIG:
break;
#endif
#ifdef PR_SET_DUMPABLE
case PR_SET_DUMPABLE:
tprintf(", %lu", tcp->u_arg[1]);
break;
#endif
#ifdef PR_GET_DUMPABLE
case PR_GET_DUMPABLE:
break;
#endif
#ifdef PR_SET_UNALIGN
case PR_SET_UNALIGN:
tprintf(", %s", unalignctl_string(tcp->u_arg[1]));
break;
#endif
#ifdef PR_GET_UNALIGN
case PR_GET_UNALIGN:
tprintf(", %#lx", tcp->u_arg[1]);
break;
#endif
#ifdef PR_SET_KEEPCAPS
case PR_SET_KEEPCAPS:
tprintf(", %lu", tcp->u_arg[1]);
break;
#endif
#ifdef PR_GET_KEEPCAPS
case PR_GET_KEEPCAPS:
break;
#endif
default:
for (i = 1; i < tcp->u_nargs; i++)
tprintf(", %#lx", tcp->u_arg[i]);
break;
}
} else {
switch (tcp->u_arg[0]) {
#ifdef PR_GET_PDEATHSIG
case PR_GET_PDEATHSIG:
if (umove(tcp, tcp->u_arg[1], &i) < 0)
tprintf(", %#lx", tcp->u_arg[1]);
else
tprintf(", {%u}", i);
break;
#endif
#ifdef PR_GET_DUMPABLE
case PR_GET_DUMPABLE:
return RVAL_UDECIMAL;
#endif
#ifdef PR_GET_UNALIGN
case PR_GET_UNALIGN:
if (syserror(tcp) || umove(tcp, tcp->u_arg[1], &i) < 0)
break;
tcp->auxstr = unalignctl_string(i);
return RVAL_STR;
#endif
#ifdef PR_GET_KEEPCAPS
case PR_GET_KEEPCAPS:
return RVAL_UDECIMAL;
#endif
default:
break;
}
}
return 0;
}
#endif /* HAVE_PRCTL */
#if defined(FREEBSD) || defined(SUNOS4) || defined(SVR4)
int
sys_gethostid(tcp)
struct tcb *tcp;
{
if (exiting(tcp))
return RVAL_HEX;
return 0;
}
#endif /* FREEBSD || SUNOS4 || SVR4 */
int
sys_sethostname(tcp)
struct tcb *tcp;
{
if (entering(tcp)) {
printpathn(tcp, tcp->u_arg[0], tcp->u_arg[1]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
#if defined(ALPHA) || defined(FREEBSD) || defined(SUNOS4) || defined(SVR4)
int
sys_gethostname(tcp)
struct tcb *tcp;
{
if (exiting(tcp)) {
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[0]);
else
printpath(tcp, tcp->u_arg[0]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
#endif /* ALPHA || FREEBSD || SUNOS4 || SVR4 */
int
sys_setdomainname(tcp)
struct tcb *tcp;
{
if (entering(tcp)) {
printpathn(tcp, tcp->u_arg[0], tcp->u_arg[1]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
#if !defined(LINUX)
int
sys_getdomainname(tcp)
struct tcb *tcp;
{
if (exiting(tcp)) {
if (syserror(tcp))
tprintf("%#lx", tcp->u_arg[0]);
else
printpath(tcp, tcp->u_arg[0]);
tprintf(", %lu", tcp->u_arg[1]);
}
return 0;
}
#endif /* !LINUX */
int
sys_exit(tcp)
struct tcb *tcp;
{
if (exiting(tcp)) {
fprintf(stderr, "_exit returned!\n");
return -1;
}
/* special case: we stop tracing this process, finish line now */
tprintf("%ld) ", tcp->u_arg[0]);
tabto(acolumn);
tprintf("= ?");
printtrailer();
return 0;
}
int
internal_exit(tcp)
struct tcb *tcp;
{
if (entering(tcp)) {
tcp->flags |= TCB_EXITING;
#ifdef __NR_exit_group
# ifdef IA64
if (ia32) {
if (tcp->scno == 252)
tcp->flags |= TCB_GROUP_EXITING;
} else
# endif
if (known_scno(tcp) == __NR_exit_group)
tcp->flags |= TCB_GROUP_EXITING;
#endif
}
return 0;
}
/* TCP is creating a child we want to follow.
If there will be space in tcbtab for it, set TCB_FOLLOWFORK and return 0.
If not, clear TCB_FOLLOWFORK, print an error, and return 1. */
static void
fork_tcb(struct tcb *tcp)
{
if (nprocs == tcbtabsize)
expand_tcbtab();
tcp->flags |= TCB_FOLLOWFORK;
}
#ifdef USE_PROCFS
int
sys_fork(struct tcb *tcp)
{
if (exiting(tcp) && !syserror(tcp)) {
if (getrval2(tcp)) {
tcp->auxstr = "child process";
return RVAL_UDECIMAL | RVAL_STR;
}
}
return 0;
}
#if UNIXWARE > 2
int
sys_rfork(tcp)
struct tcb *tcp;
{
if (entering(tcp)) {
tprintf ("%ld", tcp->u_arg[0]);
}
else if (!syserror(tcp)) {
if (getrval2(tcp)) {
tcp->auxstr = "child process";
return RVAL_UDECIMAL | RVAL_STR;
}
}
return 0;
}
#endif
int
internal_fork(tcp)
struct tcb *tcp;
{
struct tcb *tcpchild;
if (exiting(tcp)) {
#ifdef SYS_rfork
if (known_scno(tcp) == SYS_rfork && !(tcp->u_arg[0]&RFPROC))
return 0;
#endif
if (getrval2(tcp))
return 0;
if (!followfork)
return 0;
fork_tcb(tcp);
if (syserror(tcp))
return 0;
tcpchild = alloctcb(tcp->u_rval);
if (proc_open(tcpchild, 2) < 0)
droptcb(tcpchild);
}
return 0;
}
#else /* !USE_PROCFS */
#ifdef LINUX
/* defines copied from linux/sched.h since we can't include that
* ourselves (it conflicts with *lots* of libc includes)
*/
#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
#define CLONE_VM 0x00000100 /* set if VM shared between processes */
#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
#define CLONE_SIGHAND 0x00000800 /* set if signal handlers shared */
#define CLONE_IDLETASK 0x00001000 /* kernel-only flag */
#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
#define CLONE_THREAD 0x00010000 /* Same thread group? */
#define CLONE_NEWNS 0x00020000 /* New namespace group? */
#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
#define CLONE_DETACHED 0x00400000 /* parent wants no child-exit signal */
#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
static const struct xlat clone_flags[] = {
{ CLONE_VM, "CLONE_VM" },
{ CLONE_FS, "CLONE_FS" },
{ CLONE_FILES, "CLONE_FILES" },
{ CLONE_SIGHAND, "CLONE_SIGHAND" },
{ CLONE_IDLETASK, "CLONE_IDLETASK"},
{ CLONE_PTRACE, "CLONE_PTRACE" },
{ CLONE_VFORK, "CLONE_VFORK" },
{ CLONE_PARENT, "CLONE_PARENT" },
{ CLONE_THREAD, "CLONE_THREAD" },
{ CLONE_NEWNS, "CLONE_NEWNS" },
{ CLONE_SYSVSEM, "CLONE_SYSVSEM" },
{ CLONE_SETTLS, "CLONE_SETTLS" },
{ CLONE_PARENT_SETTID,"CLONE_PARENT_SETTID" },
{ CLONE_CHILD_CLEARTID,"CLONE_CHILD_CLEARTID" },
{ CLONE_DETACHED, "CLONE_DETACHED" },
{ CLONE_UNTRACED, "CLONE_UNTRACED" },
{ CLONE_CHILD_SETTID,"CLONE_CHILD_SETTID" },
{ 0, NULL },
};
# ifdef I386
# include <asm/ldt.h>
# ifdef HAVE_STRUCT_USER_DESC
# define modify_ldt_ldt_s user_desc
# endif
extern void print_ldt_entry();
# endif
# if defined IA64
# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_STACKSIZE (known_scno(tcp) == SYS_clone2 ? 2 : -1)
# define ARG_PTID (known_scno(tcp) == SYS_clone2 ? 3 : 2)
# define ARG_CTID (known_scno(tcp) == SYS_clone2 ? 4 : 3)
# define ARG_TLS (known_scno(tcp) == SYS_clone2 ? 5 : 4)
# elif defined S390 || defined S390X || defined CRISV10 || defined CRISV32
# define ARG_STACK 0
# define ARG_FLAGS 1
# define ARG_PTID 2
# define ARG_CTID 3
# define ARG_TLS 4
# elif defined X86_64 || defined ALPHA
# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_PTID 2
# define ARG_CTID 3
# define ARG_TLS 4
# else
# define ARG_FLAGS 0
# define ARG_STACK 1
# define ARG_PTID 2
# define ARG_TLS 3
# define ARG_CTID 4
# endif
int
sys_clone(tcp)
struct tcb *tcp;
{
if (exiting(tcp)) {
unsigned long flags = tcp->u_arg[ARG_FLAGS];
tprintf("child_stack=%#lx, ", tcp->u_arg[ARG_STACK]);
# ifdef ARG_STACKSIZE
if (ARG_STACKSIZE != -1)
tprintf("stack_size=%#lx, ",
tcp->u_arg[ARG_STACKSIZE]);
# endif
tprintf("flags=");
printflags(clone_flags, flags &~ CSIGNAL, NULL);
if ((flags & CSIGNAL) != 0)
tprintf("|%s", signame(flags & CSIGNAL));
if ((flags & (CLONE_PARENT_SETTID|CLONE_CHILD_SETTID
|CLONE_CHILD_CLEARTID|CLONE_SETTLS)) == 0)
return 0;
if (flags & CLONE_PARENT_SETTID)
tprintf(", parent_tidptr=%#lx", tcp->u_arg[ARG_PTID]);
if (flags & CLONE_SETTLS) {
# ifdef I386
struct modify_ldt_ldt_s copy;
if (umove(tcp, tcp->u_arg[ARG_TLS], ©) != -1) {
tprintf(", {entry_number:%d, ",
copy.entry_number);
if (!verbose(tcp))
tprintf("...}");
else
print_ldt_entry(©);
}
else
# endif
tprintf(", tls=%#lx", tcp->u_arg[ARG_TLS]);
}
if (flags & (CLONE_CHILD_SETTID|CLONE_CHILD_CLEARTID))
tprintf(", child_tidptr=%#lx", tcp->u_arg[ARG_CTID]);
}
return 0;
}
int
sys_unshare(struct tcb *tcp)
{
if (entering(tcp))
printflags(clone_flags, tcp->u_arg[0], "CLONE_???");
return 0;
}
#endif
int
sys_fork(tcp)
struct tcb *tcp;
{
if (exiting(tcp))
return RVAL_UDECIMAL;
return 0;
}
int
change_syscall(struct tcb *tcp, int new)
{
#if defined(LINUX)
#if defined(I386)
/* Attempt to make vfork into fork, which we can follow. */
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(ORIG_EAX * 4), new) < 0)
return -1;
return 0;
#elif defined(X86_64)
/* Attempt to make vfork into fork, which we can follow. */
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(ORIG_RAX * 8), new) < 0)
return -1;
return 0;
#elif defined(POWERPC)
if (ptrace(PTRACE_POKEUSER, tcp->pid,
(char*)(sizeof(unsigned long)*PT_R0), new) < 0)
return -1;
return 0;
#elif defined(S390) || defined(S390X)
/* s390 linux after 2.4.7 has a hook in entry.S to allow this */
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GPR2), new)<0)
return -1;
return 0;
#elif defined(M68K)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_ORIG_D0), new)<0)
return -1;
return 0;
#elif defined(SPARC) || defined(SPARC64)
struct pt_regs regs;
if (ptrace(PTRACE_GETREGS, tcp->pid, (char*)®s, 0)<0)
return -1;
regs.u_regs[U_REG_G1] = new;
if (ptrace(PTRACE_SETREGS, tcp->pid, (char*)®s, 0)<0)
return -1;
return 0;
#elif defined(MIPS)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_V0), new)<0)
return -1;
return 0;
#elif defined(ALPHA)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_A3), new)<0)
return -1;
return 0;
#elif defined(AVR32)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_R8), new) < 0)
return -1;
return 0;
#elif defined(BFIN)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_P0), new)<0)
return -1;
return 0;
#elif defined(IA64)
if (ia32) {
switch (new) {
case 2:
break; /* x86 SYS_fork */
case SYS_clone:
new = 120;
break;
default:
fprintf(stderr, "%s: unexpected syscall %d\n",
__FUNCTION__, new);
return -1;
}
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R1), new)<0)
return -1;
} else if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_R15), new)<0)
return -1;
return 0;
#elif defined(HPPA)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(PT_GR20), new)<0)
return -1;
return 0;
#elif defined(SH)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*(REG_REG0+3)), new)<0)
return -1;
return 0;
#elif defined(SH64)
/* Top half of reg encodes the no. of args n as 0x1n.
Assume 0 args as kernel never actually checks... */
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(REG_SYSCALL),
0x100000 | new) < 0)
return -1;
return 0;
#elif defined(CRISV10) || defined(CRISV32)
if (ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*PT_R9), new) < 0)
return -1;
return 0;
#elif defined(ARM)
/* Some kernels support this, some (pre-2.6.16 or so) don't. */
# ifndef PTRACE_SET_SYSCALL
# define PTRACE_SET_SYSCALL 23
# endif
if (ptrace (PTRACE_SET_SYSCALL, tcp->pid, 0, new & 0xffff) != 0)
return -1;
return 0;
#else
#warning Do not know how to handle change_syscall for this architecture
#endif /* architecture */
#endif /* LINUX */
return -1;
}
#if 0
int
setarg(tcp, argnum)
struct tcb *tcp;
int argnum;
{
#if defined(AVR32)
{
errno = 0;
if (argnum == 0)
ptrace(PTRACE_POKEUSER, tcp->pid,
(char *)(REG_R12_ORIG),
tcp->u_arg[argnum]);
else if (argnum < 4)
/* r11 .. r9 */
ptrace(PTRACE_POKEUSER, tcp->pid,
(char *)(REG_R12 - 4 * argnum),
tcp->u_arg[argnum]);
else if (argnum < 5)
/* r5 */
ptrace(PTRACE_POKEUSER, tcp->pid,
(char *)(REG_R5),
tcp->u_arg[argnum]);
else if (argnum < 6)
/* r3 */
ptrace(PTRACE_POKEUSER, tcp->pid,
(char *)(REG_R3),
tcp->u_arg[argnum]);
else
return -E2BIG;
if (errno)
return -1;
}
#elif defined(IA64)
{
unsigned long *bsp, *ap;
if (upeek(tcp, PT_AR_BSP, (long *) &bsp) , 0)
return -1;
ap = ia64_rse_skip_regs(bsp, argnum);
errno = 0;
ptrace(PTRACE_POKEDATA, tcp->pid, (char *) ap, tcp->u_arg[argnum]);
if (errno)
return -1;
}
#elif defined(I386)
{
ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(4*argnum), tcp->u_arg[argnum]);
if (errno)
return -1;
}
#elif defined(X86_64)
{
ptrace(PTRACE_POKEUSER, tcp->pid, (char*)(8*(long)argnum), tcp->u_arg[argnum]);
if (errno)
return -1;
}
#elif defined(POWERPC)
#ifndef PT_ORIG_R3
#define PT_ORIG_R3 34
#endif
{
ptrace(PTRACE_POKEUSER, tcp->pid,
(char*)((argnum==0 ? PT_ORIG_R3 : argnum+PT_R3)*sizeof(unsigned long)),
tcp->u_arg[argnum]);
if (errno)
return -1;
}
#elif defined(MIPS)
{
errno = 0;
if (argnum < 4)
ptrace(PTRACE_POKEUSER, tcp->pid,
(char*)(REG_A0 + argnum), tcp->u_arg[argnum]);
else {
unsigned long *sp;
if (upeek(tcp, REG_SP, (long *) &sp) , 0)
return -1;
ptrace(PTRACE_POKEDATA, tcp->pid,
(char*)(sp + argnum - 4), tcp->u_arg[argnum]);
}
if (errno)
return -1;
}
#elif defined(S390) || defined(S390X)
{
if(argnum <= 5)
ptrace(PTRACE_POKEUSER, tcp->pid,
(char *) (argnum==0 ? PT_ORIGGPR2 :
PT_GPR2 + argnum*sizeof(long)),
tcp->u_arg[argnum]);
else
return -E2BIG;
if (errno)
return -1;
}
#else
# warning Sorry, setargs not implemented for this architecture.
#endif
return 0;
}
#endif
#if defined SYS_clone || defined SYS_clone2
int
internal_clone(tcp)
struct tcb *tcp;
{
struct tcb *tcpchild;
int pid;
if (entering(tcp)) {
if (!followfork)
return 0;
fork_tcb(tcp);
if (setbpt(tcp) < 0)
return 0;
} else {
int bpt = tcp->flags & TCB_BPTSET;
if (!(tcp->flags & TCB_FOLLOWFORK))
return 0;
if (syserror(tcp)) {
if (bpt)
clearbpt(tcp);
return 0;
}
pid = tcp->u_rval;
#ifdef CLONE_PTRACE /* See new setbpt code. */
tcpchild = pid2tcb(pid);
if (tcpchild != NULL) {
/* The child already reported its startup trap
before the parent reported its syscall return. */
if ((tcpchild->flags
& (TCB_STARTUP|TCB_ATTACHED|TCB_SUSPENDED))
!= (TCB_STARTUP|TCB_ATTACHED|TCB_SUSPENDED))
fprintf(stderr, "\
[preattached child %d of %d in weird state!]\n",
pid, tcp->pid);
}
else
#endif
{
fork_tcb(tcp);
tcpchild = alloctcb(pid);
}
#ifndef CLONE_PTRACE
/* Attach to the new child */
if (ptrace(PTRACE_ATTACH, pid, (char *) 1, 0) < 0) {
if (bpt)
clearbpt(tcp);
perror("PTRACE_ATTACH");
fprintf(stderr, "Too late?\n");
droptcb(tcpchild);
return 0;
}
#endif
if (bpt)
clearbpt(tcp);
tcpchild->flags |= TCB_ATTACHED;
/* Child has BPT too, must be removed on first occasion. */
if (bpt) {
tcpchild->flags |= TCB_BPTSET;
tcpchild->baddr = tcp->baddr;
memcpy(tcpchild->inst, tcp->inst,
sizeof tcpchild->inst);
}
tcpchild->parent = tcp;
tcp->nchildren++;
if (tcpchild->flags & TCB_SUSPENDED) {
/* The child was born suspended, due to our having
forced CLONE_PTRACE. */
if (bpt)
clearbpt(tcpchild);
tcpchild->flags &= ~(TCB_SUSPENDED|TCB_STARTUP);
if (ptrace_restart(PTRACE_SYSCALL, tcpchild, 0) < 0)
return -1;
if (!qflag)
fprintf(stderr, "\
Process %u resumed (parent %d ready)\n",
pid, tcp->pid);
}
else {
if (!qflag)
fprintf(stderr, "Process %d attached\n", pid);
}
#ifdef TCB_CLONE_THREAD
{
/*
* Save the flags used in this call,
* in case we point TCP to our parent below.
*/
int call_flags = tcp->u_arg[ARG_FLAGS];
if ((tcp->flags & TCB_CLONE_THREAD) &&
tcp->parent != NULL) {
/* The parent in this clone is itself a
thread belonging to another process.