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process.c
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <[email protected]>
* Copyright (c) 1993 Branko Lankester <[email protected]>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <[email protected]>
* Copyright (c) 1996-1999 Wichert Akkerman <[email protected]>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* Copyright (c) 2000 PocketPenguins Inc. Linux for Hitachi SuperH
* port by Greg Banks <[email protected]>
*
* 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
#ifdef 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 /* LINUX */
#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>
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 /* LINUX */
int
sys_fork(tcp)
struct tcb *tcp;
{
if (exiting(tcp))
return RVAL_UDECIMAL;
return 0;
}
int
change_syscall(struct tcb *tcp, int new)
{
#ifdef 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;
#elif defined(TILE)
if (ptrace(PTRACE_POKEUSER, tcp->pid,
(char*)PTREGS_OFFSET_REG(0),
new) != 0)
return -1;
return 0;
#else
#warning Do not know how to handle change_syscall for this architecture
#endif /* architecture */
#endif /* LINUX */
return -1;
}
#ifdef LINUX
int
internal_fork(struct tcb *tcp)
{
if (entering(tcp)) {
if (!followfork)
return 0;
fork_tcb(tcp);
if (setbpt(tcp) < 0)
return 0;
} else {
struct tcb *tcpchild;
int pid;
int bpt;
if (!(tcp->flags & TCB_FOLLOWFORK))
return 0;
bpt = tcp->flags & TCB_BPTSET;
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 /* CLONE_PTRACE */
{
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 /* !CLONE_PTRACE */
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.
There is no meaning to the parentage
relationship of the new child with the
thread, only with the process. We
associate the new thread with our
parent. Since this is done for every
new thread, there will never be a
TCB_CLONE_THREAD process that has
children. */
--tcp->nchildren;
tcp = tcp->parent;
tcpchild->parent = tcp;
++tcp->nchildren;
}
if (call_flags & CLONE_THREAD) {
tcpchild->flags |= TCB_CLONE_THREAD;
++tcp->nclone_threads;
}
if (call_flags & CLONE_DETACHED) {
tcpchild->flags |= TCB_CLONE_DETACHED;
++tcp->nclone_detached;
}
}
#endif /* TCB_CLONE_THREAD */
}
return 0;
}
#else /* !LINUX */
int
internal_fork(tcp)
struct tcb *tcp;
{
struct tcb *tcpchild;
int pid;
int dont_follow = 0;
#ifdef SYS_vfork
if (known_scno(tcp) == SYS_vfork) {
/* Attempt to make vfork into fork, which we can follow. */
if (change_syscall(tcp, SYS_fork) < 0)
dont_follow = 1;
}
#endif
if (entering(tcp)) {
if (!followfork || dont_follow)
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 (bpt)
clearbpt(tcp);
if (syserror(tcp))
return 0;
pid = tcp->u_rval;
fork_tcb(tcp);
tcpchild = alloctcb(pid);
#ifdef SUNOS4
#ifdef oldway
/* The child must have run before it can be attached. */
{
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 10000;
select(0, NULL, NULL, NULL, &tv);
}
if (ptrace(PTRACE_ATTACH, pid, (char *)1, 0) < 0) {
perror("PTRACE_ATTACH");
fprintf(stderr, "Too late?\n");
droptcb(tcpchild);
return 0;
}
#else /* !oldway */
/* Try to catch the new process as soon as possible. */
{
int i;
for (i = 0; i < 1024; i++)
if (ptrace(PTRACE_ATTACH, pid, (char *) 1, 0) >= 0)
break;
if (i == 1024) {
perror("PTRACE_ATTACH");
fprintf(stderr, "Too late?\n");
droptcb(tcpchild);
return 0;
}
}
#endif /* !oldway */
#endif /* SUNOS4 */
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 (!qflag)
fprintf(stderr, "Process %d attached\n", pid);