text: /*
   * 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>
   * 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.
   */
  
  #include "defs.h"
  #ifndef __BIONIC__
  # include <sys/user.h>
  #endif
  #include <sys/param.h>
  
  #ifdef HAVE_SYS_REG_H
  # include <sys/reg.h>
  # ifndef PTRACE_PEEKUSR
  #  define PTRACE_PEEKUSR PTRACE_PEEKUSER
  # endif
  #elif defined(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(SPARC64)
  # undef PTRACE_GETREGS
  # define PTRACE_GETREGS PTRACE_GETREGS64
  # undef PTRACE_SETREGS
  # define PTRACE_SETREGS PTRACE_SETREGS64
  #endif
  
  #if defined(IA64)
  # include <asm/ptrace_offsets.h>
  # include <asm/rse.h>
  #endif
  
  /* for struct iovec */
  #include <sys/uio.h>
  /* for NT_PRSTATUS */
  #ifdef HAVE_ELF_H
  # include <elf.h>
  #endif
  
  #if defined(AARCH64)
  # include <asm/ptrace.h>
  #endif
  
  #if defined(XTENSA)
  # include <asm/ptrace.h>
  #endif
  
  #ifndef ERESTARTSYS
  # define ERESTARTSYS	512
  #endif
  #ifndef ERESTARTNOINTR
  # define ERESTARTNOINTR	513
  #endif
  #ifndef ERESTARTNOHAND
  # define ERESTARTNOHAND	514	/* restart if no handler */
  #endif
  #ifndef ERESTART_RESTARTBLOCK
  # define ERESTART_RESTARTBLOCK 516	/* restart by calling sys_restart_syscall */
  #endif
  
  #ifndef NSIG
  # warning: NSIG is not defined, using 32
  # define NSIG 32
  #endif
  #ifdef ARM
  /* Ugh. Is this really correct? ARM has no RT signals?! */
  # undef NSIG
  # define NSIG 32
  #endif
  
  #include "syscall.h"
  
  /* Define these shorthand notations to simplify the syscallent files. */
  #define TD TRACE_DESC
  #define TF TRACE_FILE
  #define TI TRACE_IPC
  #define TN TRACE_NETWORK
  #define TP TRACE_PROCESS
  #define TS TRACE_SIGNAL
  #define TM TRACE_MEMORY
  #define NF SYSCALL_NEVER_FAILS
  #define MA MAX_ARGS
  
  const struct_sysent sysent0[] = {
  #include "syscallent.h"
  };
  
  #if SUPPORTED_PERSONALITIES > 1
  static const struct_sysent sysent1[] = {
  # include "syscallent1.h"
  };
  #endif
  
  #if SUPPORTED_PERSONALITIES > 2
  static const struct_sysent sysent2[] = {
  # include "syscallent2.h"
  };
  #endif
  
  /* Now undef them since short defines cause wicked namespace pollution. */
  #undef TD
  #undef TF
  #undef TI
  #undef TN
  #undef TP
  #undef TS
  #undef TM
  #undef NF
  #undef MA
  
  /*
   * `ioctlent.h' may be generated from `ioctlent.raw' by the auxiliary
   * program `ioctlsort', such that the list is sorted by the `code' field.
   * This has the side-effect of resolving the _IO.. macros into
   * plain integers, eliminating the need to include here everything
   * in "/usr/include".
   */
  
  const char *const errnoent0[] = {
  #include "errnoent.h"
  };
  const char *const signalent0[] = {
  #include "signalent.h"
  };
  const struct_ioctlent ioctlent0[] = {
  #include "ioctlent.h"
  };
  
  #if SUPPORTED_PERSONALITIES > 1
  static const char *const errnoent1[] = {
  # include "errnoent1.h"
  };
  static const char *const signalent1[] = {
  # include "signalent1.h"
  };
  static const struct_ioctlent ioctlent1[] = {
  # include "ioctlent1.h"
  };
  #endif
  
  #if SUPPORTED_PERSONALITIES > 2
  static const char *const errnoent2[] = {
  # include "errnoent2.h"
  };
  static const char *const signalent2[] = {
  # include "signalent2.h"
  };
  static const struct_ioctlent ioctlent2[] = {
  # include "ioctlent2.h"
  };
  #endif
  
  enum {
  	nsyscalls0 = ARRAY_SIZE(sysent0)
  #if SUPPORTED_PERSONALITIES > 1
  	, nsyscalls1 = ARRAY_SIZE(sysent1)
  # if SUPPORTED_PERSONALITIES > 2
  	, nsyscalls2 = ARRAY_SIZE(sysent2)
  # endif
  #endif
  };
  
  enum {
  	nerrnos0 = ARRAY_SIZE(errnoent0)
  #if SUPPORTED_PERSONALITIES > 1
  	, nerrnos1 = ARRAY_SIZE(errnoent1)
  # if SUPPORTED_PERSONALITIES > 2
  	, nerrnos2 = ARRAY_SIZE(errnoent2)
  # endif
  #endif
  };
  
  enum {
  	nsignals0 = ARRAY_SIZE(signalent0)
  #if SUPPORTED_PERSONALITIES > 1
  	, nsignals1 = ARRAY_SIZE(signalent1)
  # if SUPPORTED_PERSONALITIES > 2
  	, nsignals2 = ARRAY_SIZE(signalent2)
  # endif
  #endif
  };
  
  enum {
  	nioctlents0 = ARRAY_SIZE(ioctlent0)
  #if SUPPORTED_PERSONALITIES > 1
  	, nioctlents1 = ARRAY_SIZE(ioctlent1)
  # if SUPPORTED_PERSONALITIES > 2
  	, nioctlents2 = ARRAY_SIZE(ioctlent2)
  # endif
  #endif
  };
  
  #if SUPPORTED_PERSONALITIES > 1
  const struct_sysent *sysent = sysent0;
  const char *const *errnoent = errnoent0;
  const char *const *signalent = signalent0;
  const struct_ioctlent *ioctlent = ioctlent0;
  #endif
  unsigned nsyscalls = nsyscalls0;
  unsigned nerrnos = nerrnos0;
  unsigned nsignals = nsignals0;
  unsigned nioctlents = nioctlents0;
  
  unsigned num_quals;
  qualbits_t *qual_vec[SUPPORTED_PERSONALITIES];
  
  static const unsigned nsyscall_vec[SUPPORTED_PERSONALITIES] = {
  	nsyscalls0,
  #if SUPPORTED_PERSONALITIES > 1
  	nsyscalls1,
  #endif
  #if SUPPORTED_PERSONALITIES > 2
  	nsyscalls2,
  #endif
  };
  static const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
  	sysent0,
  #if SUPPORTED_PERSONALITIES > 1
  	sysent1,
  #endif
  #if SUPPORTED_PERSONALITIES > 2
  	sysent2,
  #endif
  };
  
  enum {
  	MAX_NSYSCALLS1 = (nsyscalls0
  #if SUPPORTED_PERSONALITIES > 1
  			> nsyscalls1 ? nsyscalls0 : nsyscalls1
  #endif
  			),
  	MAX_NSYSCALLS2 = (MAX_NSYSCALLS1
  #if SUPPORTED_PERSONALITIES > 2
  			> nsyscalls2 ? MAX_NSYSCALLS1 : nsyscalls2
  #endif
  			),
  	MAX_NSYSCALLS = MAX_NSYSCALLS2,
  	/* We are ready for arches with up to 255 signals,
  	 * even though the largest known signo is on MIPS and it is 128.
  	 * The number of existing syscalls on all arches is
  	 * larger that 255 anyway, so it is just a pedantic matter.
  	 */
  	MIN_QUALS = MAX_NSYSCALLS > 255 ? MAX_NSYSCALLS : 255
  };
  
  #if SUPPORTED_PERSONALITIES > 1
  unsigned current_personality;
  
  # ifndef current_wordsize
  unsigned current_wordsize;
  static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
  	PERSONALITY0_WORDSIZE,
  	PERSONALITY1_WORDSIZE,
  # if SUPPORTED_PERSONALITIES > 2
  	PERSONALITY2_WORDSIZE,
  # endif
  };
  # endif
  
  void
  set_personality(int personality)
  {
  	nsyscalls = nsyscall_vec[personality];
  	sysent = sysent_vec[personality];
  
  	switch (personality) {
  	case 0:
  		errnoent = errnoent0;
  		nerrnos = nerrnos0;
  		ioctlent = ioctlent0;
  		nioctlents = nioctlents0;
  		signalent = signalent0;
  		nsignals = nsignals0;
  		break;
  
  	case 1:
  		errnoent = errnoent1;
  		nerrnos = nerrnos1;
  		ioctlent = ioctlent1;
  		nioctlents = nioctlents1;
  		signalent = signalent1;
  		nsignals = nsignals1;
  		break;
  
  # if SUPPORTED_PERSONALITIES > 2
  	case 2:
  		errnoent = errnoent2;
  		nerrnos = nerrnos2;
  		ioctlent = ioctlent2;
  		nioctlents = nioctlents2;
  		signalent = signalent2;
  		nsignals = nsignals2;
  		break;
  # endif
  	}
  
  	current_personality = personality;
  # ifndef current_wordsize
  	current_wordsize = personality_wordsize[personality];
  # endif
  }
  
  static void
  update_personality(struct tcb *tcp, int personality)
  {
  	if (personality == current_personality)
  		return;
  	set_personality(personality);
  
  	if (personality == tcp->currpers)
  		return;
  	tcp->currpers = personality;
  
  # if defined(POWERPC64)
  	if (!qflag) {
  		static const char *const names[] = {"64 bit", "32 bit"};
  		fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
  			tcp->pid, names[personality]);
  	}
  # elif defined(X86_64)
  	if (!qflag) {
  		static const char *const names[] = {"64 bit", "32 bit", "x32"};
  		fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
  			tcp->pid, names[personality]);
  	}
  # elif defined(X32)
  	if (!qflag) {
  		static const char *const names[] = {"x32", "32 bit"};
  		fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
  			tcp->pid, names[personality]);
  	}
  # elif defined(AARCH64)
  	if (!qflag) {
  		static const char *const names[] = {"32-bit", "AArch64"};
  		fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
  			tcp->pid, names[personality]);
  	}
  # elif defined(TILE)
  	if (!qflag) {
  		static const char *const names[] = {"64-bit", "32-bit"};
  		fprintf(stderr, "[ Process PID=%d runs in %s mode. ]\n",
  			tcp->pid, names[personality]);
  	}
  # endif
  }
  #endif
  
  static int qual_syscall(), qual_signal(), qual_desc();
  
  static const struct qual_options {
  	int bitflag;
  	const char *option_name;
  	int (*qualify)(const char *, int, int);
  	const char *argument_name;
  } qual_options[] = {
  	{ QUAL_TRACE,	"trace",	qual_syscall,	"system call"	},
  	{ QUAL_TRACE,	"t",		qual_syscall,	"system call"	},
  	{ QUAL_ABBREV,	"abbrev",	qual_syscall,	"system call"	},
  	{ QUAL_ABBREV,	"a",		qual_syscall,	"system call"	},
  	{ QUAL_VERBOSE,	"verbose",	qual_syscall,	"system call"	},
  	{ QUAL_VERBOSE,	"v",		qual_syscall,	"system call"	},
  	{ QUAL_RAW,	"raw",		qual_syscall,	"system call"	},
  	{ QUAL_RAW,	"x",		qual_syscall,	"system call"	},
  	{ QUAL_SIGNAL,	"signal",	qual_signal,	"signal"	},
  	{ QUAL_SIGNAL,	"signals",	qual_signal,	"signal"	},
  	{ QUAL_SIGNAL,	"s",		qual_signal,	"signal"	},
  	{ QUAL_READ,	"read",		qual_desc,	"descriptor"	},
  	{ QUAL_READ,	"reads",	qual_desc,	"descriptor"	},
  	{ QUAL_READ,	"r",		qual_desc,	"descriptor"	},
  	{ QUAL_WRITE,	"write",	qual_desc,	"descriptor"	},
  	{ QUAL_WRITE,	"writes",	qual_desc,	"descriptor"	},
  	{ QUAL_WRITE,	"w",		qual_desc,	"descriptor"	},
  	{ 0,		NULL,		NULL,		NULL		},
  };
  
  static void
  reallocate_qual(int n)
  {
  	unsigned p;
  	qualbits_t *qp;
  	for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
  		qp = qual_vec[p] = realloc(qual_vec[p], n * sizeof(qualbits_t));
  		if (!qp)
  			die_out_of_memory();
  		memset(&qp[num_quals], 0, (n - num_quals) * sizeof(qualbits_t));
  	}
  	num_quals = n;
  }
  
  static void
  qualify_one(int n, int bitflag, int not, int pers)
  {
  	unsigned p;
  
  	if (num_quals <= n)
  		reallocate_qual(n + 1);
  
  	for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
  		if (pers == p || pers < 0) {
  			if (not)
  				qual_vec[p][n] &= ~bitflag;
  			else
  				qual_vec[p][n] |= bitflag;
  		}
  	}
  }
  
  static int
  qual_syscall(const char *s, int bitflag, int not)
  {
  	unsigned p;
  	unsigned i;
  	int rc = -1;
  
  	if (*s >= '0' && *s <= '9') {
  		i = string_to_uint(s);
  		if (i >= MAX_NSYSCALLS)
  			return -1;
  		qualify_one(i, bitflag, not, -1);
  		return 0;
  	}
  
  	for (p = 0; p < SUPPORTED_PERSONALITIES; p++) {
  		for (i = 0; i < nsyscall_vec[p]; i++) {
  			if (sysent_vec[p][i].sys_name
  			 && strcmp(s, sysent_vec[p][i].sys_name) == 0
  			) {
  				qualify_one(i, bitflag, not, p);
  				rc = 0;
  			}
  		}
  	}
  
  	return rc;
  }
  
  static int
  qual_signal(const char *s, int bitflag, int not)
  {
  	int i;
  
  	if (*s >= '0' && *s <= '9') {
  		int signo = string_to_uint(s);
  		if (signo < 0 || signo > 255)
  			return -1;
  		qualify_one(signo, bitflag, not, -1);
  		return 0;
  	}
  	if (strncasecmp(s, "SIG", 3) == 0)
  		s += 3;
  	for (i = 0; i <= NSIG; i++) {
  		if (strcasecmp(s, signame(i) + 3) == 0) {
  			qualify_one(i, bitflag, not, -1);
  			return 0;
  		}
  	}
  	return -1;
  }
  
  static int
  qual_desc(const char *s, int bitflag, int not)
  {
  	if (*s >= '0' && *s <= '9') {
  		int desc = string_to_uint(s);
  		if (desc < 0 || desc > 0x7fff) /* paranoia */
  			return -1;
  		qualify_one(desc, bitflag, not, -1);
  		return 0;
  	}
  	return -1;
  }
  
  static int
  lookup_class(const char *s)
  {
  	if (strcmp(s, "file") == 0)
  		return TRACE_FILE;
  	if (strcmp(s, "ipc") == 0)
  		return TRACE_IPC;
  	if (strcmp(s, "network") == 0)
  		return TRACE_NETWORK;
  	if (strcmp(s, "process") == 0)
  		return TRACE_PROCESS;
  	if (strcmp(s, "signal") == 0)
  		return TRACE_SIGNAL;
  	if (strcmp(s, "desc") == 0)
  		return TRACE_DESC;
  	if (strcmp(s, "memory") == 0)
  		return TRACE_MEMORY;
  	return -1;
  }
  
  void
  qualify(const char *s)
  {
  	const struct qual_options *opt;
  	int not;
  	char *copy;
  	const char *p;
  	int i, n;
  
  	if (num_quals == 0)
  		reallocate_qual(MIN_QUALS);
  
  	opt = &qual_options[0];
  	for (i = 0; (p = qual_options[i].option_name); i++) {
  		n = strlen(p);
  		if (strncmp(s, p, n) == 0 && s[n] == '=') {
  			opt = &qual_options[i];
  			s += n + 1;
  			break;
  		}
  	}
  	not = 0;
  	if (*s == '!') {
  		not = 1;
  		s++;
  	}
  	if (strcmp(s, "none") == 0) {
  		not = 1 - not;
  		s = "all";
  	}
  	if (strcmp(s, "all") == 0) {
  		for (i = 0; i < num_quals; i++) {
  			qualify_one(i, opt->bitflag, not, -1);
  		}
  		return;
  	}
  	for (i = 0; i < num_quals; i++) {
  		qualify_one(i, opt->bitflag, !not, -1);
  	}
  	copy = strdup(s);
  	if (!copy)
  		die_out_of_memory();
  	for (p = strtok(copy, ","); p; p = strtok(NULL, ",")) {
  		if (opt->bitflag == QUAL_TRACE && (n = lookup_class(p)) > 0) {
  			unsigned pers;
  			for (pers = 0; pers < SUPPORTED_PERSONALITIES; pers++) {
  				for (i = 0; i < nsyscall_vec[pers]; i++)
  					if (sysent_vec[pers][i].sys_flags & n)
  						qualify_one(i, opt->bitflag, not, pers);
  			}
  			continue;
  		}
  		if (opt->qualify(p, opt->bitflag, not)) {
  			error_msg_and_die("invalid %s '%s'",
  				opt->argument_name, p);
  		}
  	}
  	free(copy);
  	return;
  }
  
  #ifdef SYS_socket_subcall
  static void
  decode_socket_subcall(struct tcb *tcp)
  {
  	unsigned long addr;
  	unsigned int i, n, size;
  
  	if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
  		return;
  
  	tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
  	tcp->qual_flg = qual_flags[tcp->scno];
  	tcp->s_ent = &sysent[tcp->scno];
  	addr = tcp->u_arg[1];
  	size = current_wordsize;
  	n = tcp->s_ent->nargs;
  	for (i = 0; i < n; ++i) {
  		if (size == sizeof(int)) {
  			unsigned int arg;
  			if (umove(tcp, addr, &arg) < 0)
  				arg = 0;
  			tcp->u_arg[i] = arg;
  		}
  		else {
  			unsigned long arg;
  			if (umove(tcp, addr, &arg) < 0)
  				arg = 0;
  			tcp->u_arg[i] = arg;
  		}
  		addr += size;
  	}
  }
  #endif
  
  #ifdef SYS_ipc_subcall
  static void
  decode_ipc_subcall(struct tcb *tcp)
  {
  	unsigned int i, n;
  
  	if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
  		return;
  
  	tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
  	tcp->qual_flg = qual_flags[tcp->scno];
  	tcp->s_ent = &sysent[tcp->scno];
  	n = tcp->s_ent->nargs;
  	for (i = 0; i < n; i++)
  		tcp->u_arg[i] = tcp->u_arg[i + 1];
  }
  #endif
  
  int
  printargs(struct tcb *tcp)
  {
  	if (entering(tcp)) {
  		int i;
  		int n = tcp->s_ent->nargs;
  		for (i = 0; i < n; i++)
  			tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
  	}
  	return 0;
  }
  
  int
  printargs_lu(struct tcb *tcp)
  {
  	if (entering(tcp)) {
  		int i;
  		int n = tcp->s_ent->nargs;
  		for (i = 0; i < n; i++)
  			tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
  	}
  	return 0;
  }
  
  int
  printargs_ld(struct tcb *tcp)
  {
  	if (entering(tcp)) {
  		int i;
  		int n = tcp->s_ent->nargs;
  		for (i = 0; i < n; i++)
  			tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
  	}
  	return 0;
  }
  
  #if defined(SPARC) || defined(SPARC64) || defined(IA64) || defined(SH)
  long
  getrval2(struct tcb *tcp)
  {
  	long val;
  
  # if defined(SPARC) || defined(SPARC64)
  	val = sparc_regs.u_regs[U_REG_O1];
  # elif defined(SH)
  	if (upeek(tcp, 4*(REG_REG0+1), &val) < 0)
  		return -1;
  # elif defined(IA64)
  	if (upeek(tcp, PT_R9, &val) < 0)
  		return -1;
  # endif
  
  	return val;
  }
  #endif
  
  int
  is_restart_error(struct tcb *tcp)
  {
  	switch (tcp->u_error) {
  		case ERESTARTSYS:
  		case ERESTARTNOINTR:
  		case ERESTARTNOHAND:
  		case ERESTART_RESTARTBLOCK:
  			return 1;
  		default:
  			break;
  	}
  	return 0;
  }
  
  #if defined(I386)
  struct user_regs_struct i386_regs;
  # define ARCH_REGS_FOR_GETREGSET i386_regs
  #elif defined(X86_64) || defined(X32)
  /*
   * On i386, pt_regs and user_regs_struct are the same,
   * but on 64 bit x86, user_regs_struct has six more fields:
   * fs_base, gs_base, ds, es, fs, gs.
   * PTRACE_GETREGS fills them too, so struct pt_regs would overflow.
   */
  struct i386_user_regs_struct {
  	uint32_t ebx;
  	uint32_t ecx;
  	uint32_t edx;
  	uint32_t esi;
  	uint32_t edi;
  	uint32_t ebp;
  	uint32_t eax;
  	uint32_t xds;
  	uint32_t xes;
  	uint32_t xfs;
  	uint32_t xgs;
  	uint32_t orig_eax;
  	uint32_t eip;
  	uint32_t xcs;
  	uint32_t eflags;
  	uint32_t esp;
  	uint32_t xss;
  };
  static union {
  	struct user_regs_struct      x86_64_r;
  	struct i386_user_regs_struct i386_r;
  } x86_regs_union;
  # define x86_64_regs x86_regs_union.x86_64_r
  # define i386_regs   x86_regs_union.i386_r
  static struct iovec x86_io = {
  	.iov_base = &x86_regs_union
  };
  #elif defined(IA64)
  long ia32 = 0; /* not static */
  static long ia64_r8, ia64_r10;
  #elif defined(POWERPC)
  static long ppc_result;
  #elif defined(M68K)
  static long m68k_d0;
  #elif defined(BFIN)
  static long bfin_r0;
  #elif defined(ARM)
  struct pt_regs arm_regs; /* not static */
  # define ARCH_REGS_FOR_GETREGSET arm_regs
  #elif defined(AARCH64)
  static union {
  	struct user_pt_regs aarch64_r;
  	struct arm_pt_regs  arm_r;
  } arm_regs_union;
  # define aarch64_regs arm_regs_union.aarch64_r
  # define arm_regs     arm_regs_union.arm_r
  static struct iovec aarch64_io = {
  	.iov_base = &arm_regs_union
  };
  #elif defined(ALPHA)
  static long alpha_r0;
  static long alpha_a3;
  #elif defined(AVR32)
  static struct pt_regs avr32_regs;
  #elif defined(SPARC) || defined(SPARC64)
  struct pt_regs sparc_regs; /* not static */
  #elif defined(LINUX_MIPSN32)
  static long long mips_a3;
  static long long mips_r2;
  #elif defined(MIPS)
  static long mips_a3;
  static long mips_r2;
  #elif defined(S390) || defined(S390X)
  static long gpr2;
  static long syscall_mode;
  #elif defined(HPPA)
  static long hppa_r28;
  #elif defined(SH)
  static long sh_r0;
  #elif defined(SH64)
  static long sh64_r9;
  #elif defined(CRISV10) || defined(CRISV32)
  static long cris_r10;
  #elif defined(TILE)
  struct pt_regs tile_regs;
  #elif defined(MICROBLAZE)
  static long microblaze_r3;
  #elif defined(OR1K)
  static struct user_regs_struct or1k_regs;
  # define ARCH_REGS_FOR_GETREGSET or1k_regs
  #elif defined(METAG)
  static struct user_gp_regs metag_regs;
  # define ARCH_REGS_FOR_GETREGSET metag_regs
  #elif defined(XTENSA)
  static long xtensa_a2;
  #endif
  
  void
  printcall(struct tcb *tcp)
  {
  #define PRINTBADPC tprintf(sizeof(long) == 4 ? "[????????] " : \
  			   sizeof(long) == 8 ? "[????????????????] " : \
  			   NULL /* crash */)
  	if (get_regs_error) {
  		PRINTBADPC;
  		return;
  	}
  #if defined(I386)
  	tprintf("[%08lx] ", i386_regs.eip);
  #elif defined(S390) || defined(S390X)
  	long psw;
  	if (upeek(tcp, PT_PSWADDR, &psw) < 0) {
  		PRINTBADPC;
  		return;
  	}
  # ifdef S390
  	tprintf("[%08lx] ", psw);
  # elif S390X
  	tprintf("[%016lx] ", psw);
  # endif
  #elif defined(X86_64) || defined(X32)
  	if (x86_io.iov_len == sizeof(i386_regs)) {
  		tprintf("[%08x] ", (unsigned) i386_regs.eip);
  	} else {
  # if defined(X86_64)
  		tprintf("[%016lx] ", (unsigned long) x86_64_regs.rip);
  # elif defined(X32)
  		/* Note: this truncates 64-bit rip to 32 bits */
  		tprintf("[%08lx] ", (unsigned long) x86_64_regs.rip);
  # endif
  	}
  #elif defined(IA64)
  	long ip;
  	if (upeek(tcp, PT_B0, &ip) < 0) {
  		PRINTBADPC;
  		return;
  	}
  	tprintf("[%08lx] ", ip);
  #elif defined(POWERPC)
  	long pc;
  	if (upeek(tcp, sizeof(unsigned long)*PT_NIP, &pc) < 0) {
  		PRINTBADPC;
  		return;
  	}
  # ifdef POWERPC64
  	tprintf("[%016lx] ", pc);
  # else
  	tprintf("[%08lx] ", pc);
  # endif
  #elif defined(M68K)
  	long pc;
  	if (upeek(tcp, 4*PT_PC, &pc) < 0) {
  		tprints("[????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(ALPHA)
  	long pc;
  	if (upeek(tcp, REG_PC, &pc) < 0) {
  		tprints("[????????????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(SPARC)
  	tprintf("[%08lx] ", sparc_regs.pc);
  #elif defined(SPARC64)
  	tprintf("[%08lx] ", sparc_regs.tpc);
  #elif defined(HPPA)
  	long pc;
  	if (upeek(tcp, PT_IAOQ0, &pc) < 0) {
  		tprints("[????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(MIPS)
  	long pc;
  	if (upeek(tcp, REG_EPC, &pc) < 0) {
  		tprints("[????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(SH)
  	long pc;
  	if (upeek(tcp, 4*REG_PC, &pc) < 0) {
  		tprints("[????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(SH64)
  	long pc;
  	if (upeek(tcp, REG_PC, &pc) < 0) {
  		tprints("[????????????????] ");
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(ARM)
  	tprintf("[%08lx] ", arm_regs.ARM_pc);
  #elif defined(AARCH64)
  	/* tprintf("[%016lx] ", aarch64_regs.regs[???]); */
  #elif defined(AVR32)
  	tprintf("[%08lx] ", avr32_regs.pc);
  #elif defined(BFIN)
  	long pc;
  	if (upeek(tcp, PT_PC, &pc) < 0) {
  		PRINTBADPC;
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(CRISV10)
  	long pc;
  	if (upeek(tcp, 4*PT_IRP, &pc) < 0) {
  		PRINTBADPC;
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(CRISV32)
  	long pc;
  	if (upeek(tcp, 4*PT_ERP, &pc) < 0) {
  		PRINTBADPC;
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #elif defined(TILE)
  # ifdef _LP64
  	tprintf("[%016lx] ", (unsigned long) tile_regs.pc);
  # else
  	tprintf("[%08lx] ", (unsigned long) tile_regs.pc);
  # endif
  #elif defined(OR1K)
  	tprintf("[%08lx] ", or1k_regs.pc);
  #elif defined(METAG)
  	tprintf("[%08lx] ", metag_regs.pc);
  #elif defined(XTENSA)
  	long pc;
  	if (upeek(tcp, REG_PC, &pc) < 0) {
  		PRINTBADPC;
  		return;
  	}
  	tprintf("[%08lx] ", pc);
  #endif /* architecture */
  }
  
  /* Shuffle syscall numbers so that we don't have huge gaps in syscall table.
   * The shuffling should be reversible: shuffle_scno(shuffle_scno(n)) == n.
   */
  #if defined(ARM) /* So far only ARM needs this */
  static long
  shuffle_scno(unsigned long scno)
  {
  	if (scno <= ARM_LAST_ORDINARY_SYSCALL)
  		return scno;
  
  	/* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
  	if (scno == 0x000ffff0)
  		return ARM_LAST_ORDINARY_SYSCALL+1;
  	if (scno == ARM_LAST_ORDINARY_SYSCALL+1)
  		return 0x000ffff0;
  
  	/* Is it ARM specific syscall?
  	 * Swap with [LAST_ORDINARY+2, LAST_ORDINARY+2 + LAST_SPECIAL] range.
  	 */
  	if (scno >= 0x000f0000
  	 && scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL
  	) {
  		return scno - 0x000f0000 + (ARM_LAST_ORDINARY_SYSCALL+2);
  	}
  	if (/* scno >= ARM_LAST_ORDINARY_SYSCALL+2 - always true */ 1
  	 && scno <= (ARM_LAST_ORDINARY_SYSCALL+2) + ARM_LAST_SPECIAL_SYSCALL
  	) {
  		return scno + 0x000f0000 - (ARM_LAST_ORDINARY_SYSCALL+2);
  	}
  
  	return scno;
  }
  #else
  # define shuffle_scno(scno) ((long)(scno))
  #endif
  
  static char*
  undefined_scno_name(struct tcb *tcp)
  {
  	static char buf[sizeof("syscall_%lu") + sizeof(long)*3];
  
  	sprintf(buf, "syscall_%lu", shuffle_scno(tcp->scno));
  	return buf;
  }
  
  #ifndef get_regs
  long get_regs_error;
  
  #if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS)
  static void get_regset(pid_t pid)
  {
  /* constant iovec */
  # if defined(ARM) \
    || defined(I386) \
    || defined(METAG) \
    || defined(OR1K)
  	static struct iovec io = {
  		.iov_base = &ARCH_REGS_FOR_GETREGSET,
  		.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
  	};
  	get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
  
  /* variable iovec */
  # elif defined(X86_64) || defined(X32)
  	/* x86_io.iov_base = &x86_regs_union; - already is */
  	x86_io.iov_len = sizeof(x86_regs_union);
  	get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &x86_io);
  # elif defined(AARCH64)
  	/* aarch64_io.iov_base = &arm_regs_union; - already is */
  	aarch64_io.iov_len = sizeof(arm_regs_union);
  	get_regs_error = ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &aarch64_io);
  # else
  #  warning both PTRACE_GETREGSET and NT_PRSTATUS are available but not yet used
  # endif
  }
  #endif /* PTRACE_GETREGSET && NT_PRSTATUS */
  
  void
  get_regs(pid_t pid)
  {
  /* PTRACE_GETREGSET only */
  # if defined(METAG) || defined(OR1K) || defined(X32) || defined(AARCH64)
  	get_regset(pid);
  
  /* PTRACE_GETREGS only */
  # elif defined(AVR32)
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &avr32_regs);
  # elif defined(TILE)
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &tile_regs);
  # elif defined(SPARC) || defined(SPARC64)
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, (char *)&sparc_regs, 0);
  
  /* try PTRACE_GETREGSET first, fallback to PTRACE_GETREGS */
  # else
  #  if defined(PTRACE_GETREGSET) && defined(NT_PRSTATUS)
  	static int getregset_support;
  
  	if (getregset_support >= 0) {
  		get_regset(pid);
  		if (getregset_support > 0)
  			return;
  		if (get_regs_error >= 0) {
  			getregset_support = 1;
  			return;
  		}
  		if (errno == EPERM || errno == ESRCH)
  			return;
  		getregset_support = -1;
  	}
  #  endif /* PTRACE_GETREGSET && NT_PRSTATUS */
  #  if defined(ARM)
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &arm_regs);
  #  elif defined(I386)
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &i386_regs);
  #  elif defined(X86_64)
  	/* Use old method, with unreliable heuristical detection of 32-bitness. */
  	x86_io.iov_len = sizeof(x86_64_regs);
  	get_regs_error = ptrace(PTRACE_GETREGS, pid, NULL, &x86_64_regs);
  	if (!get_regs_error && x86_64_regs.cs == 0x23) {
  		x86_io.iov_len = sizeof(i386_regs);
  		/*
  		 * The order is important: i386_regs and x86_64_regs
  		 * are overlaid in memory!
  		 */
  		i386_regs.ebx = x86_64_regs.rbx;
  		i386_regs.ecx = x86_64_regs.rcx;
  		i386_regs.edx = x86_64_regs.rdx;
  		i386_regs.esi = x86_64_regs.rsi;
  		i386_regs.edi = x86_64_regs.rdi;
  		i386_regs.ebp = x86_64_regs.rbp;
  		i386_regs.eax = x86_64_regs.rax;
  		/* i386_regs.xds = x86_64_regs.ds; unused by strace */
  		/* i386_regs.xes = x86_64_regs.es; ditto... */
  		/* i386_regs.xfs = x86_64_regs.fs; */
  		/* i386_regs.xgs = x86_64_regs.gs; */
  		i386_regs.orig_eax = x86_64_regs.orig_rax;
  		i386_regs.eip = x86_64_regs.rip;
  		/* i386_regs.xcs = x86_64_regs.cs; */
  		/* i386_regs.eflags = x86_64_regs.eflags; */
  		i386_regs.esp = x86_64_regs.rsp;
  		/* i386_regs.xss = x86_64_regs.ss; */
  	}
  #  else
  #   error unhandled architecture
  #  endif /* ARM || I386 || X86_64 */
  # endif
  }
  #endif /* !get_regs */
  
  /* Returns:
   * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
   * 1: ok, continue in trace_syscall_entering().
   * other: error, trace_syscall_entering() should print error indicator
   *    ("????" etc) and bail out.
   */
  static int
  get_scno(struct tcb *tcp)
  {
  	long scno = 0;
  
  #if defined(S390) || defined(S390X)
  	if (upeek(tcp, PT_GPR2, &syscall_mode) < 0)
  		return -1;
  
  	if (syscall_mode != -ENOSYS) {
  		/*
  		 * Since kernel version 2.5.44 the scno gets passed in gpr2.
  		 */
  		scno = syscall_mode;
  	} else {
  		/*
  		 * Old style of "passing" the scno via the SVC instruction.
  		 */
  		long psw;
  		long opcode, offset_reg, tmp;
  		void *svc_addr;
  		static const int gpr_offset[16] = {
  				PT_GPR0,  PT_GPR1,  PT_ORIGGPR2, PT_GPR3,
  				PT_GPR4,  PT_GPR5,  PT_GPR6,     PT_GPR7,
  				PT_GPR8,  PT_GPR9,  PT_GPR10,    PT_GPR11,
  				PT_GPR12, PT_GPR13, PT_GPR14,    PT_GPR15
  		};
  
  		if (upeek(tcp, PT_PSWADDR, &psw) < 0)
  			return -1;
  		errno = 0;
  		opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(psw - sizeof(long)), 0);
  		if (errno) {
  			perror_msg("peektext(psw-oneword)");
  			return -1;
  		}
  
  		/*
  		 *  We have to check if the SVC got executed directly or via an
  		 *  EXECUTE instruction. In case of EXECUTE it is necessary to do
  		 *  instruction decoding to derive the system call number.
  		 *  Unfortunately the opcode sizes of EXECUTE and SVC are differently,
  		 *  so that this doesn't work if a SVC opcode is part of an EXECUTE
  		 *  opcode. Since there is no way to find out the opcode size this
  		 *  is the best we can do...
  		 */
  		if ((opcode & 0xff00) == 0x0a00) {
  			/* SVC opcode */
  			scno = opcode & 0xff;
  		}
  		else {
  			/* SVC got executed by EXECUTE instruction */
  
  			/*
  			 *  Do instruction decoding of EXECUTE. If you really want to
  			 *  understand this, read the Principles of Operations.
  			 */
  			svc_addr = (void *) (opcode & 0xfff);
  
  			tmp = 0;
  			offset_reg = (opcode & 0x000f0000) >> 16;
  			if (offset_reg && (upeek(tcp, gpr_offset[offset_reg], &tmp) < 0))
  				return -1;
  			svc_addr += tmp;
  
  			tmp = 0;
  			offset_reg = (opcode & 0x0000f000) >> 12;
  			if (offset_reg && (upeek(tcp, gpr_offset[offset_reg], &tmp) < 0))
  				return -1;
  			svc_addr += tmp;
  
  			scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, svc_addr, 0);
  			if (errno)
  				return -1;
  # if defined(S390X)
  			scno >>= 48;
  # else
  			scno >>= 16;
  # endif
  			tmp = 0;
  			offset_reg = (opcode & 0x00f00000) >> 20;
  			if (offset_reg && (upeek(tcp, gpr_offset[offset_reg], &tmp) < 0))
  				return -1;
  
  			scno = (scno | tmp) & 0xff;
  		}
  	}
  #elif defined(POWERPC)
  	if (upeek(tcp, sizeof(unsigned long)*PT_R0, &scno) < 0)
  		return -1;
  # ifdef POWERPC64
  	/* TODO: speed up strace by not doing this at every syscall.
  	 * We only need to do it after execve.
  	 */
  	int currpers;
  	long val;
  
  	/* Check for 64/32 bit mode. */
  	if (upeek(tcp, sizeof(unsigned long)*PT_MSR, &val) < 0)
  		return -1;
  	/* SF is bit 0 of MSR */
  	if (val < 0)
  		currpers = 0;
  	else
  		currpers = 1;
  	update_personality(tcp, currpers);
  # endif
  #elif defined(AVR32)
  	scno = avr32_regs.r8;
  #elif defined(BFIN)
  	if (upeek(tcp, PT_ORIG_P0, &scno))
  		return -1;
  #elif defined(I386)
  	scno = i386_regs.orig_eax;
  #elif defined(X86_64) || defined(X32)
  # ifndef __X32_SYSCALL_BIT
  #  define __X32_SYSCALL_BIT	0x40000000
  # endif
  	int currpers;
  # if 1
  	/* GETREGSET of NT_PRSTATUS tells us regset size,
  	 * which unambiguously detects i386.
  	 *
  	 * Linux kernel distinguishes x86-64 and x32 processes
  	 * solely by looking at __X32_SYSCALL_BIT:
  	 * arch/x86/include/asm/compat.h::is_x32_task():
  	 * if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
  	 *         return true;
  	 */
  	if (x86_io.iov_len == sizeof(i386_regs)) {
  		scno = i386_regs.orig_eax;
  		currpers = 1;
  	} else {
  		scno = x86_64_regs.orig_rax;
  		currpers = 0;
  		if (scno & __X32_SYSCALL_BIT) {
  			scno -= __X32_SYSCALL_BIT;
  			currpers = 2;
  		}
  	}
  # elif 0
  	/* cs = 0x33 for long mode (native 64 bit and x32)
  	 * cs = 0x23 for compatibility mode (32 bit)
  	 * ds = 0x2b for x32 mode (x86-64 in 32 bit)
  	 */
  	scno = x86_64_regs.orig_rax;
  	switch (x86_64_regs.cs) {
  		case 0x23: currpers = 1; break;
  		case 0x33:
  			if (x86_64_regs.ds == 0x2b) {
  				currpers = 2;
  				scno &= ~__X32_SYSCALL_BIT;
  			} else
  				currpers = 0;
  			break;
  		default:
  			fprintf(stderr, "Unknown value CS=0x%08X while "
  				 "detecting personality of process "
  				 "PID=%d\n", (int)x86_64_regs.cs, tcp->pid);
  			currpers = current_personality;
  			break;
  	}
  # elif 0
  	/* This version analyzes the opcode of a syscall instruction.
  	 * (int 0x80 on i386 vs. syscall on x86-64)
  	 * It works, but is too complicated, and strictly speaking, unreliable.
  	 */
  	unsigned long call, rip = x86_64_regs.rip;
  	/* sizeof(syscall) == sizeof(int 0x80) == 2 */
  	rip -= 2;
  	errno = 0;
  	call = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)rip, (char *)0);
  	if (errno)
  		fprintf(stderr, "ptrace_peektext failed: %s\n",
  				strerror(errno));
  	switch (call & 0xffff) {
  		/* x86-64: syscall = 0x0f 0x05 */
  		case 0x050f: currpers = 0; break;
  		/* i386: int 0x80 = 0xcd 0x80 */
  		case 0x80cd: currpers = 1; break;
  		default:
  			currpers = current_personality;
  			fprintf(stderr,
  				"Unknown syscall opcode (0x%04X) while "
  				"detecting personality of process "
  				"PID=%d\n", (int)call, tcp->pid);
  			break;
  	}
  # endif
  
  # ifdef X32
  	/* If we are built for a x32 system, then personality 0 is x32
  	 * (not x86_64), and stracing of x86_64 apps is not supported.
  	 * Stracing of i386 apps is still supported.
  	 */
  	if (currpers == 0) {
  		fprintf(stderr, "syscall_%lu(...) in unsupported "
  				"64-bit mode of process PID=%d\n",
  			scno, tcp->pid);
  		return 0;
  	}
  	currpers &= ~2; /* map 2,1 to 0,1 */
  # endif
  	update_personality(tcp, currpers);
  #elif defined(IA64)
  #	define IA64_PSR_IS	((long)1 << 34)
  	long psr;
  	if (upeek(tcp, PT_CR_IPSR, &psr) >= 0)
  		ia32 = (psr & IA64_PSR_IS) != 0;
  	if (ia32) {
  		if (upeek(tcp, PT_R1, &scno) < 0)
  			return -1;
  	} else {
  		if (upeek(tcp, PT_R15, &scno) < 0)
  			return -1;
  	}
  #elif defined(AARCH64)
  	switch (aarch64_io.iov_len) {
  		case sizeof(aarch64_regs):
  			/* We are in 64-bit mode */
  			scno = aarch64_regs.regs[8];
  			update_personality(tcp, 1);
  			break;
  		case sizeof(arm_regs):
  			/* We are in 32-bit mode */
  			scno = arm_regs.ARM_r7;
  			update_personality(tcp, 0);
  			break;
  	}
  #elif defined(ARM)
  	if (arm_regs.ARM_ip != 0) {
  		/* It is not a syscall entry */
  		fprintf(stderr, "pid %d stray syscall exit\n", tcp->pid);
  		tcp->flags |= TCB_INSYSCALL;
  		return 0;
  	}
  	/* Note: we support only 32-bit CPUs, not 26-bit */
  
  	if (arm_regs.ARM_cpsr & 0x20) {
  		/* Thumb mode */
  		scno = arm_regs.ARM_r7;
  	} else {
  		/* ARM mode */
  		errno = 0;
  		scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL);
  		if (errno)
  			return -1;
  
  		/* EABI syscall convention? */
  		if (scno == 0xef000000) {
  			scno = arm_regs.ARM_r7; /* yes */
  		} else {
  			if ((scno & 0x0ff00000) != 0x0f900000) {
  				fprintf(stderr, "pid %d unknown syscall trap 0x%08lx\n",
  					tcp->pid, scno);
  				return -1;
  			}
  			/* Fixup the syscall number */
  			scno &= 0x000fffff;
  		}
  	}
  
  	scno = shuffle_scno(scno);
  #elif defined(M68K)
  	if (upeek(tcp, 4*PT_ORIG_D0, &scno) < 0)
  		return -1;
  #elif defined(LINUX_MIPSN32)
  	unsigned long long regs[38];
  
  	if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
  		return -1;
  	mips_a3 = regs[REG_A3];
  	mips_r2 = regs[REG_V0];
  
  	scno = mips_r2;
  	if (!SCNO_IN_RANGE(scno)) {
  		if (mips_a3 == 0 || mips_a3 == -1) {
  			if (debug_flag)
  				fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
  			return 0;
  		}
  	}
  #elif defined(MIPS)
  	if (upeek(tcp, REG_A3, &mips_a3) < 0)
  		return -1;
  	if (upeek(tcp, REG_V0, &scno) < 0)
  		return -1;
  
  	if (!SCNO_IN_RANGE(scno)) {
  		if (mips_a3 == 0 || mips_a3 == -1) {
  			if (debug_flag)
  				fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
  			return 0;
  		}
  	}
  #elif defined(ALPHA)
  	if (upeek(tcp, REG_A3, &alpha_a3) < 0)
  		return -1;
  	if (upeek(tcp, REG_R0, &scno) < 0)
  		return -1;
  
  	/*
  	 * Do some sanity checks to figure out if it's
  	 * really a syscall entry
  	 */
  	if (!SCNO_IN_RANGE(scno)) {
  		if (alpha_a3 == 0 || alpha_a3 == -1) {
  			if (debug_flag)
  				fprintf(stderr, "stray syscall exit: r0 = %ld\n", scno);
  			return 0;
  		}
  	}
  #elif defined(SPARC) || defined(SPARC64)
  	/* Disassemble the syscall trap. */
  	/* Retrieve the syscall trap instruction. */
  	unsigned long trap;
  	errno = 0;
  # if defined(SPARC64)
  	trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.tpc, 0);
  	trap >>= 32;
  # else
  	trap = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)sparc_regs.pc, 0);
  # endif
  	if (errno)
  		return -1;
  
  	/* Disassemble the trap to see what personality to use. */
  	switch (trap) {
  	case 0x91d02010:
  		/* Linux/SPARC syscall trap. */
  		update_personality(tcp, 0);
  		break;
  	case 0x91d0206d:
  		/* Linux/SPARC64 syscall trap. */
  		update_personality(tcp, 2);
  		break;
  	case 0x91d02000:
  		/* SunOS syscall trap. (pers 1) */
  		fprintf(stderr, "syscall: SunOS no support\n");
  		return -1;
  	case 0x91d02008:
  		/* Solaris 2.x syscall trap. (per 2) */
  		update_personality(tcp, 1);
  		break;
  	case 0x91d02009:
  		/* NetBSD/FreeBSD syscall trap. */
  		fprintf(stderr, "syscall: NetBSD/FreeBSD not supported\n");
  		return -1;
  	case 0x91d02027:
  		/* Solaris 2.x gettimeofday */
  		update_personality(tcp, 1);
  		break;
  	default:
  # if defined(SPARC64)
  		fprintf(stderr, "syscall: unknown syscall trap %08lx %016lx\n", trap, sparc_regs.tpc);
  # else
  		fprintf(stderr, "syscall: unknown syscall trap %08lx %08lx\n", trap, sparc_regs.pc);
  # endif
  		return -1;
  	}
  
  	/* Extract the system call number from the registers. */
  	if (trap == 0x91d02027)
  		scno = 156;
  	else
  		scno = sparc_regs.u_regs[U_REG_G1];
  	if (scno == 0) {
  		scno = sparc_regs.u_regs[U_REG_O0];
  		memmove(&sparc_regs.u_regs[U_REG_O0], &sparc_regs.u_regs[U_REG_O1], 7*sizeof(sparc_regs.u_regs[0]));
  	}
  #elif defined(HPPA)
  	if (upeek(tcp, PT_GR20, &scno) < 0)
  		return -1;
  #elif defined(SH)
  	/*
  	 * In the new syscall ABI, the system call number is in R3.
  	 */
  	if (upeek(tcp, 4*(REG_REG0+3), &scno) < 0)
  		return -1;
  
  	if (scno < 0) {
  		/* Odd as it may seem, a glibc bug has been known to cause
  		   glibc to issue bogus negative syscall numbers.  So for
  		   our purposes, make strace print what it *should* have been */
  		long correct_scno = (scno & 0xff);
  		if (debug_flag)
  			fprintf(stderr,
  				"Detected glibc bug: bogus system call"
  				" number = %ld, correcting to %ld\n",
  				scno,
  				correct_scno);
  		scno = correct_scno;
  	}
  #elif defined(SH64)
  	if (upeek(tcp, REG_SYSCALL, &scno) < 0)
  		return -1;
  	scno &= 0xFFFF;
  #elif defined(CRISV10) || defined(CRISV32)
  	if (upeek(tcp, 4*PT_R9, &scno) < 0)
  		return -1;
  #elif defined(TILE)
  	int currpers;
  	scno = tile_regs.regs[10];
  # ifdef __tilepro__
  	currpers = 1;
  # else
  #  ifndef PT_FLAGS_COMPAT
  #   define PT_FLAGS_COMPAT 0x10000  /* from Linux 3.8 on */
  #  endif
  	if (tile_regs.flags & PT_FLAGS_COMPAT)
  		currpers = 1;
  	else
  		currpers = 0;
  # endif
  	update_personality(tcp, currpers);
  #elif defined(MICROBLAZE)
  	if (upeek(tcp, 0, &scno) < 0)
  		return -1;
  #elif defined(OR1K)
  	scno = or1k_regs.gpr[11];
  #elif defined(METAG)
  	scno = metag_regs.dx[0][1];	/* syscall number in D1Re0 (D1.0) */
  #elif defined(XTENSA)
  	if (upeek(tcp, SYSCALL_NR, &scno) < 0)
  		return -1;
  #endif
  
  	tcp->scno = scno;
  	if (SCNO_IS_VALID(tcp->scno)) {
  		tcp->s_ent = &sysent[scno];
  		tcp->qual_flg = qual_flags[scno];
  	} else {
  		static const struct_sysent unknown = {
  			.nargs = MAX_ARGS,
  			.sys_flags = 0,
  			.sys_func = printargs,
  			.sys_name = "unknown", /* not used */
  		};
  		tcp->s_ent = &unknown;
  		tcp->qual_flg = UNDEFINED_SCNO | QUAL_RAW | DEFAULT_QUAL_FLAGS;
  	}
  	return 1;
  }
  
  /* Called at each syscall entry.
   * Returns:
   * 0: "ignore this ptrace stop", bail out of trace_syscall_entering() silently.
   * 1: ok, continue in trace_syscall_entering().
   * other: error, trace_syscall_entering() should print error indicator
   *    ("????" etc) and bail out.
   */
  static int
  syscall_fixup_on_sysenter(struct tcb *tcp)
  {
  	/* A common case of "not a syscall entry" is post-execve SIGTRAP */
  #if defined(I386)
  	if (i386_regs.eax != -ENOSYS) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (eax = %ld)\n", i386_regs.eax);
  		return 0;
  	}
  #elif defined(X86_64) || defined(X32)
  	{
  		long rax;
  		if (x86_io.iov_len == sizeof(i386_regs)) {
  			/* Sign extend from 32 bits */
  			rax = (int32_t)i386_regs.eax;
  		} else {
  			/* Note: in X32 build, this truncates 64 to 32 bits */
  			rax = x86_64_regs.rax;
  		}
  		if (rax != -ENOSYS) {
  			if (debug_flag)
  				fprintf(stderr, "not a syscall entry (rax = %ld)\n", rax);
  			return 0;
  		}
  	}
  #elif defined(S390) || defined(S390X)
  	/* TODO: we already fetched PT_GPR2 in get_scno
  	 * and stored it in syscall_mode, reuse it here
  	 * instead of re-fetching?
  	 */
  	if (upeek(tcp, PT_GPR2, &gpr2) < 0)
  		return -1;
  	if (syscall_mode != -ENOSYS)
  		syscall_mode = tcp->scno;
  	if (gpr2 != syscall_mode) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (gpr2 = %ld)\n", gpr2);
  		return 0;
  	}
  #elif defined(M68K)
  	/* TODO? Eliminate upeek's in arches below like we did in x86 */
  	if (upeek(tcp, 4*PT_D0, &m68k_d0) < 0)
  		return -1;
  	if (m68k_d0 != -ENOSYS) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (d0 = %ld)\n", m68k_d0);
  		return 0;
  	}
  #elif defined(IA64)
  	if (upeek(tcp, PT_R10, &ia64_r10) < 0)
  		return -1;
  	if (upeek(tcp, PT_R8, &ia64_r8) < 0)
  		return -1;
  	if (ia32 && ia64_r8 != -ENOSYS) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (r8 = %ld)\n", ia64_r8);
  		return 0;
  	}
  #elif defined(CRISV10) || defined(CRISV32)
  	if (upeek(tcp, 4*PT_R10, &cris_r10) < 0)
  		return -1;
  	if (cris_r10 != -ENOSYS) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (r10 = %ld)\n", cris_r10);
  		return 0;
  	}
  #elif defined(MICROBLAZE)
  	if (upeek(tcp, 3 * 4, &microblaze_r3) < 0)
  		return -1;
  	if (microblaze_r3 != -ENOSYS) {
  		if (debug_flag)
  			fprintf(stderr, "not a syscall entry (r3 = %ld)\n", microblaze_r3);
  		return 0;
  	}
  #endif
  	return 1;
  }
  
  static void
  internal_fork(struct tcb *tcp)
  {
  #if defined S390 || defined S390X || defined CRISV10 || defined CRISV32
  # define ARG_FLAGS	1
  #else
  # define ARG_FLAGS	0
  #endif
  #ifndef CLONE_UNTRACED
  # define CLONE_UNTRACED	0x00800000
  #endif
  	if ((ptrace_setoptions
  	    & (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
  	   == (PTRACE_O_TRACECLONE | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK))
  		return;
  
  	if (!followfork)
  		return;
  
  	if (entering(tcp)) {
  		/*
  		 * We won't see the new child if clone is called with
  		 * CLONE_UNTRACED, so we keep the same logic with that option
  		 * and don't trace it.
  		 */
  		if ((tcp->s_ent->sys_func == sys_clone)
  		 && (tcp->u_arg[ARG_FLAGS] & CLONE_UNTRACED)
  		)
  			return;
  		setbpt(tcp);
  	} else {
  		if (tcp->flags & TCB_BPTSET)
  			clearbpt(tcp);
  	}
  }
  
  #if defined(TCB_WAITEXECVE)
  static void
  internal_exec(struct tcb *tcp)
  {
  	/* Maybe we have post-execve SIGTRAP suppressed? */
  	if (ptrace_setoptions & PTRACE_O_TRACEEXEC)
  		return; /* yes, no need to do anything */
  
  	if (exiting(tcp) && syserror(tcp))
  		/* Error in execve, no post-execve SIGTRAP expected */
  		tcp->flags &= ~TCB_WAITEXECVE;
  	else
  		tcp->flags |= TCB_WAITEXECVE;
  }
  #endif
  
  static void
  syscall_fixup_for_fork_exec(struct tcb *tcp)
  {
  	/*
  	 * We must always trace a few critical system calls in order to
  	 * correctly support following forks in the presence of tracing
  	 * qualifiers.
  	 */
  	int (*func)();
  
  	func = tcp->s_ent->sys_func;
  
  	if (   sys_fork == func
  	    || sys_vfork == func
  	    || sys_clone == func
  	   ) {
  		internal_fork(tcp);
  		return;
  	}
  
  #if defined(TCB_WAITEXECVE)
  	if (   sys_execve == func
  # if defined(SPARC) || defined(SPARC64)
  	    || sys_execv == func
  # endif
  	   ) {
  		internal_exec(tcp);
  		return;
  	}
  #endif
  }
  
  /* Return -1 on error or 1 on success (never 0!) */
  static int
  get_syscall_args(struct tcb *tcp)
  {
  	int i, nargs;
  
  	nargs = tcp->s_ent->nargs;
  
  #if defined(S390) || defined(S390X)
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, i==0 ? PT_ORIGGPR2 : PT_GPR2 + i*sizeof(long), &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(ALPHA)
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, REG_A0+i, &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(IA64)
  	if (!ia32) {
  		unsigned long *out0, cfm, sof, sol;
  		long rbs_end;
  		/* be backwards compatible with kernel < 2.4.4... */
  #		ifndef PT_RBS_END
  #		  define PT_RBS_END	PT_AR_BSP
  #		endif
  
  		if (upeek(tcp, PT_RBS_END, &rbs_end) < 0)
  			return -1;
  		if (upeek(tcp, PT_CFM, (long *) &cfm) < 0)
  			return -1;
  
  		sof = (cfm >> 0) & 0x7f;
  		sol = (cfm >> 7) & 0x7f;
  		out0 = ia64_rse_skip_regs((unsigned long *) rbs_end, -sof + sol);
  
  		for (i = 0; i < nargs; ++i) {
  			if (umoven(tcp, (unsigned long) ia64_rse_skip_regs(out0, i),
  				   sizeof(long), (char *) &tcp->u_arg[i]) < 0)
  				return -1;
  		}
  	} else {
  		static const int argreg[MAX_ARGS] = { PT_R11 /* EBX = out0 */,
  						      PT_R9  /* ECX = out1 */,
  						      PT_R10 /* EDX = out2 */,
  						      PT_R14 /* ESI = out3 */,
  						      PT_R15 /* EDI = out4 */,
  						      PT_R13 /* EBP = out5 */};
  
  		for (i = 0; i < nargs; ++i) {
  			if (upeek(tcp, argreg[i], &tcp->u_arg[i]) < 0)
  				return -1;
  			/* truncate away IVE sign-extension */
  			tcp->u_arg[i] &= 0xffffffff;
  		}
  	}
  #elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64)
  	/* N32 and N64 both use up to six registers.  */
  	unsigned long long regs[38];
  
  	if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
  		return -1;
  
  	for (i = 0; i < nargs; ++i) {
  		tcp->u_arg[i] = regs[REG_A0 + i];
  # if defined(LINUX_MIPSN32)
  		tcp->ext_arg[i] = regs[REG_A0 + i];
  # endif
  	}
  #elif defined(MIPS)
  	if (nargs > 4) {
  		long sp;
  
  		if (upeek(tcp, REG_SP, &sp) < 0)
  			return -1;
  		for (i = 0; i < 4; ++i)
  			if (upeek(tcp, REG_A0 + i, &tcp->u_arg[i]) < 0)
  				return -1;
  		umoven(tcp, sp + 16, (nargs - 4) * sizeof(tcp->u_arg[0]),
  		       (char *)(tcp->u_arg + 4));
  	} else {
  		for (i = 0; i < nargs; ++i)
  			if (upeek(tcp, REG_A0 + i, &tcp->u_arg[i]) < 0)
  				return -1;
  	}
  #elif defined(POWERPC)
  # ifndef PT_ORIG_R3
  #  define PT_ORIG_R3 34
  # endif
  	for (i = 0; i < nargs; ++i) {
  		if (upeek(tcp, (i==0) ?
  			(sizeof(unsigned long) * PT_ORIG_R3) :
  			((i+PT_R3) * sizeof(unsigned long)),
  				&tcp->u_arg[i]) < 0)
  			return -1;
  	}
  #elif defined(SPARC) || defined(SPARC64)
  	for (i = 0; i < nargs; ++i)
  		tcp->u_arg[i] = sparc_regs.u_regs[U_REG_O0 + i];
  #elif defined(HPPA)
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, PT_GR26-4*i, &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(ARM) || defined(AARCH64)
  # if defined(AARCH64)
  	if (tcp->currpers == 1)
  		for (i = 0; i < nargs; ++i)
  			tcp->u_arg[i] = aarch64_regs.regs[i];
  	else
  # endif
  	for (i = 0; i < nargs; ++i)
  		tcp->u_arg[i] = arm_regs.uregs[i];
  #elif defined(AVR32)
  	(void)i;
  	(void)nargs;
  	tcp->u_arg[0] = avr32_regs.r12;
  	tcp->u_arg[1] = avr32_regs.r11;
  	tcp->u_arg[2] = avr32_regs.r10;
  	tcp->u_arg[3] = avr32_regs.r9;
  	tcp->u_arg[4] = avr32_regs.r5;
  	tcp->u_arg[5] = avr32_regs.r3;
  #elif defined(BFIN)
  	static const int argreg[MAX_ARGS] = { PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5 };
  
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, argreg[i], &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(SH)
  	static const int syscall_regs[MAX_ARGS] = {
  		4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6),
  		4 * (REG_REG0+7), 4 * (REG_REG0  ), 4 * (REG_REG0+1)
  	};
  
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, syscall_regs[i], &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(SH64)
  	int i;
  	/* Registers used by SH5 Linux system calls for parameters */
  	static const int syscall_regs[MAX_ARGS] = { 2, 3, 4, 5, 6, 7 };
  
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, REG_GENERAL(syscall_regs[i]), &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(I386)
  	(void)i;
  	(void)nargs;
  	tcp->u_arg[0] = i386_regs.ebx;
  	tcp->u_arg[1] = i386_regs.ecx;
  	tcp->u_arg[2] = i386_regs.edx;
  	tcp->u_arg[3] = i386_regs.esi;
  	tcp->u_arg[4] = i386_regs.edi;
  	tcp->u_arg[5] = i386_regs.ebp;
  #elif defined(X86_64) || defined(X32)
  	(void)i;
  	(void)nargs;
  	if (x86_io.iov_len != sizeof(i386_regs)) {
  		/* x86-64 or x32 ABI */
  		tcp->u_arg[0] = x86_64_regs.rdi;
  		tcp->u_arg[1] = x86_64_regs.rsi;
  		tcp->u_arg[2] = x86_64_regs.rdx;
  		tcp->u_arg[3] = x86_64_regs.r10;
  		tcp->u_arg[4] = x86_64_regs.r8;
  		tcp->u_arg[5] = x86_64_regs.r9;
  #  ifdef X32
  		tcp->ext_arg[0] = x86_64_regs.rdi;
  		tcp->ext_arg[1] = x86_64_regs.rsi;
  		tcp->ext_arg[2] = x86_64_regs.rdx;
  		tcp->ext_arg[3] = x86_64_regs.r10;
  		tcp->ext_arg[4] = x86_64_regs.r8;
  		tcp->ext_arg[5] = x86_64_regs.r9;
  #  endif
  	} else {
  		/* i386 ABI */
  		/* Zero-extend from 32 bits */
  		/* Use widen_to_long(tcp->u_arg[N]) in syscall handlers
  		 * if you need to use *sign-extended* parameter.
  		 */
  		tcp->u_arg[0] = (long)(uint32_t)i386_regs.ebx;
  		tcp->u_arg[1] = (long)(uint32_t)i386_regs.ecx;
  		tcp->u_arg[2] = (long)(uint32_t)i386_regs.edx;
  		tcp->u_arg[3] = (long)(uint32_t)i386_regs.esi;
  		tcp->u_arg[4] = (long)(uint32_t)i386_regs.edi;
  		tcp->u_arg[5] = (long)(uint32_t)i386_regs.ebp;
  	}
  #elif defined(MICROBLAZE)
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, (5 + i) * 4, &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(CRISV10) || defined(CRISV32)
  	static const int crisregs[MAX_ARGS] = {
  		4*PT_ORIG_R10, 4*PT_R11, 4*PT_R12,
  		4*PT_R13     , 4*PT_MOF, 4*PT_SRP
  	};
  
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, crisregs[i], &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(TILE)
  	for (i = 0; i < nargs; ++i)
  		tcp->u_arg[i] = tile_regs.regs[i];
  #elif defined(M68K)
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, (i < 5 ? i : i + 2)*4, &tcp->u_arg[i]) < 0)
  			return -1;
  #elif defined(OR1K)
  	(void)nargs;
  	for (i = 0; i < 6; ++i)
  		tcp->u_arg[i] = or1k_regs.gpr[3 + i];
  #elif defined(METAG)
  	for (i = 0; i < nargs; i++)
  		/* arguments go backwards from D1Ar1 (D1.3) */
  		tcp->u_arg[i] = ((unsigned long *)&metag_regs.dx[3][1])[-i];
  #elif defined(XTENSA)
  	/* arg0: a6, arg1: a3, arg2: a4, arg3: a5, arg4: a8, arg5: a9 */
  	static const int xtensaregs[MAX_ARGS] = { 6, 3, 4, 5, 8, 9 };
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, REG_A_BASE + xtensaregs[i], &tcp->u_arg[i]) < 0)
  			return -1;
  #else /* Other architecture (32bits specific) */
  	for (i = 0; i < nargs; ++i)
  		if (upeek(tcp, i*4, &tcp->u_arg[i]) < 0)
  			return -1;
  #endif
  	return 1;
  }
  
  static int
  trace_syscall_entering(struct tcb *tcp)
  {
  	int res, scno_good;
  
  #if defined TCB_WAITEXECVE
  	if (tcp->flags & TCB_WAITEXECVE) {
  		/* This is the post-execve SIGTRAP. */
  		tcp->flags &= ~TCB_WAITEXECVE;
  		return 0;
  	}
  #endif
  
  	scno_good = res = (get_regs_error ? -1 : get_scno(tcp));
  	if (res == 0)
  		return res;
  	if (res == 1) {
  		res = syscall_fixup_on_sysenter(tcp);
  		if (res == 0)
  			return res;
  		if (res == 1)
  			res = get_syscall_args(tcp);
  	}
  
  	if (res != 1) {
  		printleader(tcp);
  		if (scno_good != 1)
  			tprints("????" /* anti-trigraph gap */ "(");
  		else if (tcp->qual_flg & UNDEFINED_SCNO)
  			tprintf("%s(", undefined_scno_name(tcp));
  		else
  			tprintf("%s(", tcp->s_ent->sys_name);
  		/*
  		 * " <unavailable>" will be added later by the code which
  		 * detects ptrace errors.
  		 */
  		goto ret;
  	}
  
  	if (   sys_execve == tcp->s_ent->sys_func
  # if defined(SPARC) || defined(SPARC64)
  	    || sys_execv == tcp->s_ent->sys_func
  # endif
  	   ) {
  		hide_log_until_execve = 0;
  	}
  
  #if defined(SYS_socket_subcall) || defined(SYS_ipc_subcall)
  	while (1) {
  # ifdef SYS_socket_subcall
  		if (tcp->s_ent->sys_func == sys_socketcall) {
  			decode_socket_subcall(tcp);
  			break;
  		}
  # endif
  # ifdef SYS_ipc_subcall
  		if (tcp->s_ent->sys_func == sys_ipc) {
  			decode_ipc_subcall(tcp);
  			break;
  		}
  # endif
  		break;
  	}
  #endif
  
  	if (need_fork_exec_workarounds)
  		syscall_fixup_for_fork_exec(tcp);
  
  	if (!(tcp->qual_flg & QUAL_TRACE)
  	 || (tracing_paths && !pathtrace_match(tcp))
  	) {
  		tcp->flags |= TCB_INSYSCALL | TCB_FILTERED;
  		return 0;
  	}
  
  	tcp->flags &= ~TCB_FILTERED;
  
  	if (cflag == CFLAG_ONLY_STATS || hide_log_until_execve) {
  		res = 0;
  		goto ret;
  	}
  
  	printleader(tcp);
  	if (tcp->qual_flg & UNDEFINED_SCNO)
  		tprintf("%s(", undefined_scno_name(tcp));
  	else
  		tprintf("%s(", tcp->s_ent->sys_name);
  	if ((tcp->qual_flg & QUAL_RAW) && tcp->s_ent->sys_func != sys_exit)
  		res = printargs(tcp);
  	else
  		res = tcp->s_ent->sys_func(tcp);
  
  	fflush(tcp->outf);
   ret:
  	tcp->flags |= TCB_INSYSCALL;
  	/* Measure the entrance time as late as possible to avoid errors. */
  	if (Tflag || cflag)
  		gettimeofday(&tcp->etime, NULL);
  	return res;
  }
  
  /* Returns:
   * 1: ok, continue in trace_syscall_exiting().
   * -1: error, trace_syscall_exiting() should print error indicator
   *    ("????" etc) and bail out.
   */
  static int
  get_syscall_result(struct tcb *tcp)
  {
  #if defined(S390) || defined(S390X)
  	if (upeek(tcp, PT_GPR2, &gpr2) < 0)
  		return -1;
  #elif defined(POWERPC)
  # define SO_MASK 0x10000000
  	{
  		long flags;
  		if (upeek(tcp, sizeof(unsigned long)*PT_CCR, &flags) < 0)
  			return -1;
  		if (upeek(tcp, sizeof(unsigned long)*PT_R3, &ppc_result) < 0)
  			return -1;
  		if (flags & SO_MASK)
  			ppc_result = -ppc_result;
  	}
  #elif defined(AVR32)
  	/* already done by get_regs */
  #elif defined(BFIN)
  	if (upeek(tcp, PT_R0, &bfin_r0) < 0)
  		return -1;
  #elif defined(I386)
  	/* already done by get_regs */
  #elif defined(X86_64) || defined(X32)
  	/* already done by get_regs */
  #elif defined(IA64)
  #	define IA64_PSR_IS	((long)1 << 34)
  	long psr;
  	if (upeek(tcp, PT_CR_IPSR, &psr) >= 0)
  		ia32 = (psr & IA64_PSR_IS) != 0;
  	if (upeek(tcp, PT_R8, &ia64_r8) < 0)
  		return -1;
  	if (upeek(tcp, PT_R10, &ia64_r10) < 0)
  		return -1;
  #elif defined(ARM)
  	/* already done by get_regs */
  #elif defined(AARCH64)
  	/* register reading already done by get_regs */
  
  	/* Used to do this, but we did it on syscall entry already: */
  	/* We are in 64-bit mode (personality 1) if register struct is aarch64_regs,
  	 * else it's personality 0.
  	 */
  	/*update_personality(tcp, aarch64_io.iov_len == sizeof(aarch64_regs));*/
  #elif defined(M68K)
  	if (upeek(tcp, 4*PT_D0, &m68k_d0) < 0)
  		return -1;
  #elif defined(LINUX_MIPSN32)
  	unsigned long long regs[38];
  
  	if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &regs) < 0)
  		return -1;
  	mips_a3 = regs[REG_A3];
  	mips_r2 = regs[REG_V0];
  #elif defined(MIPS)
  	if (upeek(tcp, REG_A3, &mips_a3) < 0)
  		return -1;
  	if (upeek(tcp, REG_V0, &mips_r2) < 0)
  		return -1;
  #elif defined(ALPHA)
  	if (upeek(tcp, REG_A3, &alpha_a3) < 0)
  		return -1;
  	if (upeek(tcp, REG_R0, &alpha_r0) < 0)
  		return -1;
  #elif defined(SPARC) || defined(SPARC64)
  	/* already done by get_regs */
  #elif defined(HPPA)
  	if (upeek(tcp, PT_GR28, &hppa_r28) < 0)
  		return -1;
  #elif defined(SH)
  	/* new syscall ABI returns result in R0 */
  	if (upeek(tcp, 4*REG_REG0, (long *)&sh_r0) < 0)
  		return -1;
  #elif defined(SH64)
  	/* ABI defines result returned in r9 */
  	if (upeek(tcp, REG_GENERAL(9), (long *)&sh64_r9) < 0)
  		return -1;
  #elif defined(CRISV10) || defined(CRISV32)
  	if (upeek(tcp, 4*PT_R10, &cris_r10) < 0)
  		return -1;
  #elif defined(TILE)
  	/* already done by get_regs */
  #elif defined(MICROBLAZE)
  	if (upeek(tcp, 3 * 4, &microblaze_r3) < 0)
  		return -1;
  #elif defined(OR1K)
  	/* already done by get_regs */
  #elif defined(METAG)
  	/* already done by get_regs */
  #elif defined(XTENSA)
  	if (upeek(tcp, REG_A_BASE + 2, &xtensa_a2) < 0)
  		return -1;
  #endif
  	return 1;
  }
  
  /* Called at each syscall exit */
  static void
  syscall_fixup_on_sysexit(struct tcb *tcp)
  {
  #if defined(S390) || defined(S390X)
  	if (syscall_mode != -ENOSYS)
  		syscall_mode = tcp->scno;
  	if ((tcp->flags & TCB_WAITEXECVE)
  		 && (gpr2 == -ENOSYS || gpr2 == tcp->scno)) {
  		/*
  		 * Return from execve.
  		 * Fake a return value of zero.  We leave the TCB_WAITEXECVE
  		 * flag set for the post-execve SIGTRAP to see and reset.
  		 */
  		gpr2 = 0;
  	}
  #endif
  }
  
  /*
   * Check the syscall return value register value for whether it is
   * a negated errno code indicating an error, or a success return value.
   */
  static inline int
  is_negated_errno(unsigned long int val)
  {
  	unsigned long int max = -(long int) nerrnos;
  #if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
  	if (current_wordsize < sizeof(val)) {
  		val = (unsigned int) val;
  		max = (unsigned int) max;
  	}
  #endif
  	return val > max;
  }
  
  #if defined(X32)
  static inline int
  is_negated_errno_x32(unsigned long long val)
  {
  	unsigned long long max = -(long long) nerrnos;
  	/*
  	 * current_wordsize is 4 even in personality 0 (native X32)
  	 * but truncation _must not_ be done in it.
  	 * can't check current_wordsize here!
  	 */
  	if (current_personality != 0) {
  		val = (uint32_t) val;
  		max = (uint32_t) max;
  	}
  	return val > max;
  }
  #endif
  
  /* Returns:
   * 1: ok, continue in trace_syscall_exiting().
   * -1: error, trace_syscall_exiting() should print error indicator
   *    ("????" etc) and bail out.
   */
  static void
  get_error(struct tcb *tcp)
  {
  	int u_error = 0;
  	int check_errno = 1;
  	if (tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS) {
  		check_errno = 0;
  	}
  #if defined(S390) || defined(S390X)
  	if (check_errno && is_negated_errno(gpr2)) {
  		tcp->u_rval = -1;
  		u_error = -gpr2;
  	}
  	else {
  		tcp->u_rval = gpr2;
  	}
  #elif defined(I386)
  	if (check_errno && is_negated_errno(i386_regs.eax)) {
  		tcp->u_rval = -1;
  		u_error = -i386_regs.eax;
  	}
  	else {
  		tcp->u_rval = i386_regs.eax;
  	}
  #elif defined(X86_64)
  	long rax;
  	if (x86_io.iov_len == sizeof(i386_regs)) {
  		/* Sign extend from 32 bits */
  		rax = (int32_t)i386_regs.eax;
  	} else {
  		rax = x86_64_regs.rax;
  	}
  	if (check_errno && is_negated_errno(rax)) {
  		tcp->u_rval = -1;
  		u_error = -rax;
  	}
  	else {
  		tcp->u_rval = rax;
  	}
  #elif defined(X32)
  	/* In X32, return value is 64-bit (llseek uses one).
  	 * Using merely "long rax" would not work.
  	 */
  	long long rax;
  	if (x86_io.iov_len == sizeof(i386_regs)) {
  		/* Sign extend from 32 bits */
  		rax = (int32_t)i386_regs.eax;
  	} else {
  		rax = x86_64_regs.rax;
  	}
  	/* Careful: is_negated_errno() works only on longs */
  	if (check_errno && is_negated_errno_x32(rax)) {
  		tcp->u_rval = -1;
  		u_error = -rax;
  	}
  	else {
  		tcp->u_rval = rax; /* truncating */
  		tcp->u_lrval = rax;
  	}
  #elif defined(IA64)
  	if (ia32) {
  		int err;
  
  		err = (int)ia64_r8;
  		if (check_errno && is_negated_errno(err)) {
  			tcp->u_rval = -1;
  			u_error = -err;
  		}
  		else {
  			tcp->u_rval = err;
  		}
  	} else {
  		if (check_errno && ia64_r10) {
  			tcp->u_rval = -1;
  			u_error = ia64_r8;
  		} else {
  			tcp->u_rval = ia64_r8;
  		}
  	}
  #elif defined(MIPS)
  	if (check_errno && mips_a3) {
  		tcp->u_rval = -1;
  		u_error = mips_r2;
  	} else {
  		tcp->u_rval = mips_r2;
  # if defined(LINUX_MIPSN32)
  		tcp->u_lrval = mips_r2;
  # endif
  	}
  #elif defined(POWERPC)
  	if (check_errno && is_negated_errno(ppc_result)) {
  		tcp->u_rval = -1;
  		u_error = -ppc_result;
  	}
  	else {
  		tcp->u_rval = ppc_result;
  	}
  #elif defined(M68K)
  	if (check_errno && is_negated_errno(m68k_d0)) {
  		tcp->u_rval = -1;
  		u_error = -m68k_d0;
  	}
  	else {
  		tcp->u_rval = m68k_d0;
  	}
  #elif defined(ARM) || defined(AARCH64)
  # if defined(AARCH64)
  	if (tcp->currpers == 1) {
  		if (check_errno && is_negated_errno(aarch64_regs.regs[0])) {
  			tcp->u_rval = -1;
  			u_error = -aarch64_regs.regs[0];
  		}
  		else {
  			tcp->u_rval = aarch64_regs.regs[0];
  		}
  	}
  	else
  # endif
  	{
  		if (check_errno && is_negated_errno(arm_regs.ARM_r0)) {
  			tcp->u_rval = -1;
  			u_error = -arm_regs.ARM_r0;
  		}
  		else {
  			tcp->u_rval = arm_regs.ARM_r0;
  		}
  	}
  #elif defined(AVR32)
  	if (check_errno && avr32_regs.r12 && (unsigned) -avr32_regs.r12 < nerrnos) {
  		tcp->u_rval = -1;
  		u_error = -avr32_regs.r12;
  	}
  	else {
  		tcp->u_rval = avr32_regs.r12;
  	}
  #elif defined(BFIN)
  	if (check_errno && is_negated_errno(bfin_r0)) {
  		tcp->u_rval = -1;
  		u_error = -bfin_r0;
  	} else {
  		tcp->u_rval = bfin_r0;
  	}
  #elif defined(ALPHA)
  	if (check_errno && alpha_a3) {
  		tcp->u_rval = -1;
  		u_error = alpha_r0;
  	}
  	else {
  		tcp->u_rval = alpha_r0;
  	}
  #elif defined(SPARC)
  	if (check_errno && sparc_regs.psr & PSR_C) {
  		tcp->u_rval = -1;
  		u_error = sparc_regs.u_regs[U_REG_O0];
  	}
  	else {
  		tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
  	}
  #elif defined(SPARC64)
  	if (check_errno && sparc_regs.tstate & 0x1100000000UL) {
  		tcp->u_rval = -1;
  		u_error = sparc_regs.u_regs[U_REG_O0];
  	}
  	else {
  		tcp->u_rval = sparc_regs.u_regs[U_REG_O0];
  	}
  #elif defined(HPPA)
  	if (check_errno && is_negated_errno(hppa_r28)) {
  		tcp->u_rval = -1;
  		u_error = -hppa_r28;
  	}
  	else {
  		tcp->u_rval = hppa_r28;
  	}
  #elif defined(SH)
  	if (check_errno && is_negated_errno(sh_r0)) {
  		tcp->u_rval = -1;
  		u_error = -sh_r0;
  	}
  	else {
  		tcp->u_rval = sh_r0;
  	}
  #elif defined(SH64)
  	if (check_errno && is_negated_errno(sh64_r9)) {
  		tcp->u_rval = -1;
  		u_error = -sh64_r9;
  	}
  	else {
  		tcp->u_rval = sh64_r9;
  	}
  #elif defined(METAG)
  	/* result pointer in D0Re0 (D0.0) */
  	if (check_errno && is_negated_errno(metag_regs.dx[0][0])) {
  		tcp->u_rval = -1;
  		u_error = -metag_regs.dx[0][0];
  	}
  	else {
  		tcp->u_rval = metag_regs.dx[0][0];
  	}
  #elif defined(CRISV10) || defined(CRISV32)
  	if (check_errno && cris_r10 && (unsigned) -cris_r10 < nerrnos) {
  		tcp->u_rval = -1;
  		u_error = -cris_r10;
  	}
  	else {
  		tcp->u_rval = cris_r10;
  	}
  #elif defined(TILE)
  	/*
  	 * The standard tile calling convention returns the value (or negative
  	 * errno) in r0, and zero (or positive errno) in r1.
  	 * Until at least kernel 3.8, however, the r1 value is not reflected
  	 * in ptregs at this point, so we use r0 here.
  	 */
  	if (check_errno && is_negated_errno(tile_regs.regs[0])) {
  		tcp->u_rval = -1;
  		u_error = -tile_regs.regs[0];
  	} else {
  		tcp->u_rval = tile_regs.regs[0];
  	}
  #elif defined(MICROBLAZE)
  	if (check_errno && is_negated_errno(microblaze_r3)) {
  		tcp->u_rval = -1;
  		u_error = -microblaze_r3;
  	}
  	else {
  		tcp->u_rval = microblaze_r3;
  	}
  #elif defined(OR1K)
  	if (check_errno && is_negated_errno(or1k_regs.gpr[11])) {
  		tcp->u_rval = -1;
  		u_error = -or1k_regs.gpr[11];
  	}
  	else {
  		tcp->u_rval = or1k_regs.gpr[11];
  	}
  #elif defined(XTENSA)
  	if (check_errno && is_negated_errno(xtensa_a2)) {
  		tcp->u_rval = -1;
  		u_error = -xtensa_a2;
  	}
  	else {
  		tcp->u_rval = xtensa_a2;
  	}
  #endif
  	tcp->u_error = u_error;
  }
  
  static void
  dumpio(struct tcb *tcp)
  {
  	int (*func)();
  
  	if (syserror(tcp))
  		return;
  	if ((unsigned long) tcp->u_arg[0] >= num_quals)
  		return;
  	func = tcp->s_ent->sys_func;
  	if (func == printargs)
  		return;
  	if (qual_flags[tcp->u_arg[0]] & QUAL_READ) {
  		if (func == sys_read ||
  		    func == sys_pread ||
  		    func == sys_recv ||
  		    func == sys_recvfrom)
  			dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
  		else if (func == sys_readv)
  			dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
  		return;
  	}
  	if (qual_flags[tcp->u_arg[0]] & QUAL_WRITE) {
  		if (func == sys_write ||
  		    func == sys_pwrite ||
  		    func == sys_send ||
  		    func == sys_sendto)
  			dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
  		else if (func == sys_writev)
  			dumpiov(tcp, tcp->u_arg[2], tcp->u_arg[1]);
  		return;
  	}
  }
  
  static int
  trace_syscall_exiting(struct tcb *tcp)
  {
  	int sys_res;
  	struct timeval tv;
  	int res;
  	long u_error;
  
  	/* Measure the exit time as early as possible to avoid errors. */
  	if (Tflag || cflag)
  		gettimeofday(&tv, NULL);
  
  #if SUPPORTED_PERSONALITIES > 1
  	update_personality(tcp, tcp->currpers);
  #endif
  	res = (get_regs_error ? -1 : get_syscall_result(tcp));
  	if (res == 1) {
  		syscall_fixup_on_sysexit(tcp); /* never fails */
  		get_error(tcp); /* never fails */
  		if (need_fork_exec_workarounds)
  			syscall_fixup_for_fork_exec(tcp);
  		if (filtered(tcp) || hide_log_until_execve)
  			goto ret;
  	}
  
  	if (cflag) {
  		struct timeval t = tv;
  		count_syscall(tcp, &t);
  		if (cflag == CFLAG_ONLY_STATS) {
  			goto ret;
  		}
  	}
  
  	/* If not in -ff mode, and printing_tcp != tcp,
  	 * then the log currently does not end with output
  	 * of _our syscall entry_, but with something else.
  	 * We need to say which syscall's return is this.
  	 *
  	 * Forced reprinting via TCB_REPRINT is used only by
  	 * "strace -ff -oLOG test/threaded_execve" corner case.
  	 * It's the only case when -ff mode needs reprinting.
  	 */
  	if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
  		tcp->flags &= ~TCB_REPRINT;
  		printleader(tcp);
  		if (tcp->qual_flg & UNDEFINED_SCNO)
  			tprintf("<... %s resumed> ", undefined_scno_name(tcp));
  		else
  			tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
  	}
  	printing_tcp = tcp;
  
  	if (res != 1) {
  		/* There was error in one of prior ptrace ops */
  		tprints(") ");
  		tabto();
  		tprints("= ? <unavailable>\n");
  		line_ended();
  		tcp->flags &= ~TCB_INSYSCALL;
  		return res;
  	}
  
  	sys_res = 0;
  	if (tcp->qual_flg & QUAL_RAW) {
  		/* sys_res = printargs(tcp); - but it's nop on sysexit */
  	} else {
  	/* FIXME: not_failing_only (IOW, option -z) is broken:
  	 * failure of syscall is known only after syscall return.
  	 * Thus we end up with something like this on, say, ENOENT:
  	 *     open("doesnt_exist", O_RDONLY <unfinished ...>
  	 *     {next syscall decode}
  	 * whereas the intended result is that open(...) line
  	 * is not shown at all.
  	 */
  		if (not_failing_only && tcp->u_error)
  			goto ret;	/* ignore failed syscalls */
  		sys_res = tcp->s_ent->sys_func(tcp);
  	}
  
  	tprints(") ");
  	tabto();
  	u_error = tcp->u_error;
  	if (tcp->qual_flg & QUAL_RAW) {
  		if (u_error)
  			tprintf("= -1 (errno %ld)", u_error);
  		else
  			tprintf("= %#lx", tcp->u_rval);
  	}
  	else if (!(sys_res & RVAL_NONE) && u_error) {
  		switch (u_error) {
  		/* Blocked signals do not interrupt any syscalls.
  		 * In this case syscalls don't return ERESTARTfoo codes.
  		 *
  		 * Deadly signals set to SIG_DFL interrupt syscalls
  		 * and kill the process regardless of which of the codes below
  		 * is returned by the interrupted syscall.
  		 * In some cases, kernel forces a kernel-generated deadly
  		 * signal to be unblocked and set to SIG_DFL (and thus cause
  		 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
  		 * or SIGILL. (The alternative is to leave process spinning
  		 * forever on the faulty instruction - not useful).
  		 *
  		 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
  		 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
  		 * but kernel will always restart them.
  		 */
  		case ERESTARTSYS:
  			/* Most common type of signal-interrupted syscall exit code.
  			 * The system call will be restarted with the same arguments
  			 * if SA_RESTART is set; otherwise, it will fail with EINTR.
  			 */
  			tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
  			break;
  		case ERESTARTNOINTR:
  			/* Rare. For example, fork() returns this if interrupted.
  			 * SA_RESTART is ignored (assumed set): the restart is unconditional.
  			 */
  			tprints("= ? ERESTARTNOINTR (To be restarted)");
  			break;
  		case ERESTARTNOHAND:
  			/* pause(), rt_sigsuspend() etc use this code.
  			 * SA_RESTART is ignored (assumed not set):
  			 * syscall won't restart (will return EINTR instead)
  			 * even after signal with SA_RESTART set. However,
  			 * after SIG_IGN or SIG_DFL signal it will restart
  			 * (thus the name "restart only if has no handler").
  			 */
  			tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
  			break;
  		case ERESTART_RESTARTBLOCK:
  			/* Syscalls like nanosleep(), poll() which can't be
  			 * restarted with their original arguments use this
  			 * code. Kernel will execute restart_syscall() instead,
  			 * which changes arguments before restarting syscall.
  			 * SA_RESTART is ignored (assumed not set) similarly
  			 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
  			 * since restart data is saved in "restart block"
  			 * in task struct, and if signal handler uses a syscall
  			 * which in turn saves another such restart block,
  			 * old data is lost and restart becomes impossible)
  			 */
  			tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
  			break;
  		default:
  			if (u_error < 0)
  				tprintf("= -1 E??? (errno %ld)", u_error);
  			else if (u_error < nerrnos)
  				tprintf("= -1 %s (%s)", errnoent[u_error],
  					strerror(u_error));
  			else
  				tprintf("= -1 ERRNO_%ld (%s)", u_error,
  					strerror(u_error));
  			break;
  		}
  		if ((sys_res & RVAL_STR) && tcp->auxstr)
  			tprintf(" (%s)", tcp->auxstr);
  	}
  	else {
  		if (sys_res & RVAL_NONE)
  			tprints("= ?");
  		else {
  			switch (sys_res & RVAL_MASK) {
  			case RVAL_HEX:
  				tprintf("= %#lx", tcp->u_rval);
  				break;
  			case RVAL_OCTAL:
  				tprintf("= %#lo", tcp->u_rval);
  				break;
  			case RVAL_UDECIMAL:
  				tprintf("= %lu", tcp->u_rval);
  				break;
  			case RVAL_DECIMAL:
  				tprintf("= %ld", tcp->u_rval);
  				break;
  #if defined(LINUX_MIPSN32) || defined(X32)
  			/*
  			case RVAL_LHEX:
  				tprintf("= %#llx", tcp->u_lrval);
  				break;
  			case RVAL_LOCTAL:
  				tprintf("= %#llo", tcp->u_lrval);
  				break;
  			*/
  			case RVAL_LUDECIMAL:
  				tprintf("= %llu", tcp->u_lrval);
  				break;
  			/*
  			case RVAL_LDECIMAL:
  				tprintf("= %lld", tcp->u_lrval);
  				break;
  			*/
  #endif
  			default:
  				fprintf(stderr,
  					"invalid rval format\n");
  				break;
  			}
  		}
  		if ((sys_res & RVAL_STR) && tcp->auxstr)
  			tprintf(" (%s)", tcp->auxstr);
  	}
  	if (Tflag) {
  		tv_sub(&tv, &tv, &tcp->etime);
  		tprintf(" <%ld.%06ld>",
  			(long) tv.tv_sec, (long) tv.tv_usec);
  	}
  	tprints("\n");
  	dumpio(tcp);
  	line_ended();
  
   ret:
  	tcp->flags &= ~TCB_INSYSCALL;
  	return 0;
  }
  
  int
  trace_syscall(struct tcb *tcp)
  {
  	return exiting(tcp) ?
  		trace_syscall_exiting(tcp) : trace_syscall_entering(tcp);
  }
  