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syscall.c
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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
* 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"
#include <sys/user.h>
#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
#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 NF SYSCALL_NEVER_FAILS
#define MA MAX_ARGS
static const struct sysent sysent0[] = {
#include "syscallent.h"
};
#if SUPPORTED_PERSONALITIES >= 2
static const struct sysent sysent1[] = {
# include "syscallent1.h"
};
#endif
#if SUPPORTED_PERSONALITIES >= 3
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 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".
*/
static const char *const errnoent0[] = {
#include "errnoent.h"
};
static const char *const signalent0[] = {
#include "signalent.h"
};
static const struct ioctlent ioctlent0[] = {
#include "ioctlent.h"
};
enum { nsyscalls0 = ARRAY_SIZE(sysent0) };
enum { nerrnos0 = ARRAY_SIZE(errnoent0) };
enum { nsignals0 = ARRAY_SIZE(signalent0) };
enum { nioctlents0 = ARRAY_SIZE(ioctlent0) };
int qual_flags0[MAX_QUALS];
#if SUPPORTED_PERSONALITIES >= 2
static const char *const errnoent1[] = {
# include "errnoent1.h"
};
static const char *const signalent1[] = {
# include "signalent1.h"
};
static const struct ioctlent ioctlent1[] = {
# include "ioctlent1.h"
};
enum { nsyscalls1 = ARRAY_SIZE(sysent1) };
enum { nerrnos1 = ARRAY_SIZE(errnoent1) };
enum { nsignals1 = ARRAY_SIZE(signalent1) };
enum { nioctlents1 = ARRAY_SIZE(ioctlent1) };
int qual_flags1[MAX_QUALS];
#endif
#if SUPPORTED_PERSONALITIES >= 3
static const char *const errnoent2[] = {
# include "errnoent2.h"
};
static const char *const signalent2[] = {
# include "signalent2.h"
};
static const struct ioctlent ioctlent2[] = {
# include "ioctlent2.h"
};
enum { nsyscalls2 = ARRAY_SIZE(sysent2) };
enum { nerrnos2 = ARRAY_SIZE(errnoent2) };
enum { nsignals2 = ARRAY_SIZE(signalent2) };
enum { nioctlents2 = ARRAY_SIZE(ioctlent2) };
int qual_flags2[MAX_QUALS];
#endif
const struct sysent *sysent = sysent0;
const char *const *errnoent = errnoent0;
const char *const *signalent = signalent0;
const struct ioctlent *ioctlent = ioctlent0;
unsigned nsyscalls = nsyscalls0;
unsigned nerrnos = nerrnos0;
unsigned nsignals = nsignals0;
unsigned nioctlents = nioctlents0;
int *qual_flags = qual_flags0;
#if SUPPORTED_PERSONALITIES > 1
int current_personality;
const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
PERSONALITY0_WORDSIZE,
PERSONALITY1_WORDSIZE,
# if SUPPORTED_PERSONALITIES > 2
PERSONALITY2_WORDSIZE,
# endif
};
void
set_personality(int personality)
{
switch (personality) {
case 0:
errnoent = errnoent0;
nerrnos = nerrnos0;
sysent = sysent0;
nsyscalls = nsyscalls0;
ioctlent = ioctlent0;
nioctlents = nioctlents0;
signalent = signalent0;
nsignals = nsignals0;
qual_flags = qual_flags0;
break;
case 1:
errnoent = errnoent1;
nerrnos = nerrnos1;
sysent = sysent1;
nsyscalls = nsyscalls1;
ioctlent = ioctlent1;
nioctlents = nioctlents1;
signalent = signalent1;
nsignals = nsignals1;
qual_flags = qual_flags1;
break;
# if SUPPORTED_PERSONALITIES >= 3
case 2:
errnoent = errnoent2;
nerrnos = nerrnos2;
sysent = sysent2;
nsyscalls = nsyscalls2;
ioctlent = ioctlent2;
nioctlents = nioctlents2;
signalent = signalent2;
nsignals = nsignals2;
qual_flags = qual_flags2;
break;
# endif
}
current_personality = personality;
}
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]);
}
# endif
}
#endif
static int qual_syscall(), qual_signal(), qual_fault(), 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_FAULT, "fault", qual_fault, "fault" },
{ QUAL_FAULT, "faults", qual_fault, "fault" },
{ QUAL_FAULT, "m", qual_fault, "fault" },
{ 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
qualify_one(int n, int bitflag, int not, int pers)
{
if (pers == 0 || pers < 0) {
if (not)
qual_flags0[n] &= ~bitflag;
else
qual_flags0[n] |= bitflag;
}
#if SUPPORTED_PERSONALITIES >= 2
if (pers == 1 || pers < 0) {
if (not)
qual_flags1[n] &= ~bitflag;
else
qual_flags1[n] |= bitflag;
}
#endif
#if SUPPORTED_PERSONALITIES >= 3
if (pers == 2 || pers < 0) {
if (not)
qual_flags2[n] &= ~bitflag;
else
qual_flags2[n] |= bitflag;
}
#endif
}
static int
qual_syscall(const char *s, int bitflag, int not)
{
int i;
int rc = -1;
if (*s >= '0' && *s <= '9') {
int i = string_to_uint(s);
if (i < 0 || i >= MAX_QUALS)
return -1;
qualify_one(i, bitflag, not, -1);
return 0;
}
for (i = 0; i < nsyscalls0; i++)
if (sysent0[i].sys_name &&
strcmp(s, sysent0[i].sys_name) == 0) {
qualify_one(i, bitflag, not, 0);
rc = 0;
}
#if SUPPORTED_PERSONALITIES >= 2
for (i = 0; i < nsyscalls1; i++)
if (sysent1[i].sys_name &&
strcmp(s, sysent1[i].sys_name) == 0) {
qualify_one(i, bitflag, not, 1);
rc = 0;
}
#endif
#if SUPPORTED_PERSONALITIES >= 3
for (i = 0; i < nsyscalls2; i++)
if (sysent2[i].sys_name &&
strcmp(s, sysent2[i].sys_name) == 0) {
qualify_one(i, bitflag, not, 2);
rc = 0;
}
#endif
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 >= MAX_QUALS)
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_fault(const char *s, int bitflag, int not)
{
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 >= MAX_QUALS)
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;
return -1;
}
void
qualify(const char *s)
{
const struct qual_options *opt;
int not;
char *copy;
const char *p;
int i, n;
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 < MAX_QUALS; i++) {
qualify_one(i, opt->bitflag, not, -1);
}
return;
}
for (i = 0; i < MAX_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) {
for (i = 0; i < nsyscalls0; i++)
if (sysent0[i].sys_flags & n)
qualify_one(i, opt->bitflag, not, 0);
#if SUPPORTED_PERSONALITIES >= 2
for (i = 0; i < nsyscalls1; i++)
if (sysent1[i].sys_flags & n)
qualify_one(i, opt->bitflag, not, 1);
#endif
#if SUPPORTED_PERSONALITIES >= 3
for (i = 0; i < nsyscalls2; i++)
if (sysent2[i].sys_flags & n)
qualify_one(i, opt->bitflag, not, 2);
#endif
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, size;
if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_socket_nsubcalls)
return;
tcp->scno = SYS_socket_subcall + tcp->u_arg[0];
addr = tcp->u_arg[1];
tcp->u_nargs = sysent[tcp->scno].nargs;
size = current_wordsize;
for (i = 0; i < tcp->u_nargs; ++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;
if (tcp->u_arg[0] < 0 || tcp->u_arg[0] >= SYS_ipc_nsubcalls)
return;
tcp->scno = SYS_ipc_subcall + tcp->u_arg[0];
tcp->u_nargs = sysent[tcp->scno].nargs;
for (i = 0; i < tcp->u_nargs; i++)
tcp->u_arg[i] = tcp->u_arg[i + 1];
}
#endif
int
printargs(struct tcb *tcp)
{
if (entering(tcp)) {
int i;
for (i = 0; i < tcp->u_nargs; i++)
tprintf("%s%#lx", i ? ", " : "", tcp->u_arg[i]);
}
return 0;
}
int
printargs_lu(struct tcb *tcp)
{
if (entering(tcp)) {
int i;
for (i = 0; i < tcp->u_nargs; i++)
tprintf("%s%lu", i ? ", " : "", tcp->u_arg[i]);
}
return 0;
}
int
printargs_ld(struct tcb *tcp)
{
if (entering(tcp)) {
int i;
for (i = 0; i < tcp->u_nargs; i++)
tprintf("%s%ld", i ? ", " : "", tcp->u_arg[i]);
}
return 0;
}
long
getrval2(struct tcb *tcp)
{
long val = -1;
#if defined(SPARC) || defined(SPARC64)
struct pt_regs regs;
if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)®s, 0) < 0)
return -1;
val = 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;
}
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 pt_regs i386_regs;
#elif defined(X86_64) || defined(X32)
/*
* On 32 bits, pt_regs and user_regs_struct are the same,
* but on 64 bits, 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.
*/
static struct user_regs_struct x86_64_regs;
#elif defined(IA64)
long r8, r10, psr; /* TODO: make static? */
long ia32 = 0; /* not static */
#elif defined(POWERPC)
static long ppc_result;
#elif defined(M68K)
static long d0;
#elif defined(BFIN)
static long r0;
#elif defined(ARM)
static struct pt_regs regs;
#elif defined(ALPHA)
static long r0;
static long a3;
#elif defined(AVR32)
static struct pt_regs regs;
#elif defined(SPARC) || defined(SPARC64)
static struct pt_regs regs;
static unsigned long trap;
#elif defined(LINUX_MIPSN32)
static long long a3;
static long long r2;
#elif defined(MIPS)
static long a3;
static long r2;
#elif defined(S390) || defined(S390X)
static long gpr2;
static long pc;
static long syscall_mode;
#elif defined(HPPA)
static long r28;
#elif defined(SH)
static long r0;
#elif defined(SH64)
static long r9;
#elif defined(CRISV10) || defined(CRISV32)
static long r10;
#elif defined(MICROBLAZE)
static long r3;
#endif
/* 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 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, &pc) < 0)
return -1;
errno = 0;
opcode = ptrace(PTRACE_PEEKTEXT, tcp->pid, (char *)(pc-sizeof(long)), 0);
if (errno) {
perror("peektext(pc-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)
/* Read complete register set in one go. */
if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, ®s) < 0)
return -1;
scno = regs.r8;
#elif defined(BFIN)
if (upeek(tcp, PT_ORIG_P0, &scno))
return -1;
#elif defined(I386)
if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &i386_regs) < 0)
return -1;
scno = i386_regs.orig_eax;
#elif defined(X86_64) || defined(X32)
# ifndef __X32_SYSCALL_BIT
# define __X32_SYSCALL_BIT 0x40000000
# endif
# ifndef __X32_SYSCALL_MASK
# define __X32_SYSCALL_MASK __X32_SYSCALL_BIT
# endif
int currpers;
if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long) &x86_64_regs) < 0)
return -1;
scno = x86_64_regs.orig_rax;
/* Check CS register value. On x86-64 linux it is:
* 0x33 for long mode (64 bit)
* 0x23 for compatibility mode (32 bit)
* Check DS register value. On x86-64 linux it is:
* 0x2b for x32 mode (x86-64 in 32 bit)
*/
switch (x86_64_regs.cs) {
case 0x23: currpers = 1; break;
case 0x33:
if (x86_64_regs.ds == 0x2b) {
currpers = 2;
scno &= ~__X32_SYSCALL_MASK;
} 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;
}
# if 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.
*/
unsigned long val, rip, i;
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
/* Value of currpers:
* 0: 64 bit
* 1: 32 bit
* 2: X32
* Value of current_personality:
* 0: X32
* 1: 32 bit
*/
switch (currpers) {
case 0:
fprintf(stderr, "syscall_%lu (...) in unsupported "
"64-bit mode of process PID=%d\n",
scno, tcp->pid);
return 0;
case 2:
currpers = 0;
}
# endif
update_personality(tcp, currpers);
#elif defined(IA64)
# define IA64_PSR_IS ((long)1 << 34)
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(ARM)
/* Read complete register set in one go. */
if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)®s) == -1)
return -1;
/*
* We only need to grab the syscall number on syscall entry.
*/
if (regs.ARM_ip == 0) {
/*
* Note: we only deal with only 32-bit CPUs here.
*/
if (regs.ARM_cpsr & 0x20) {
/*
* Get the Thumb-mode system call number
*/
scno = regs.ARM_r7;
} else {
/*
* Get the ARM-mode system call number
*/
errno = 0;
scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(regs.ARM_pc - 4), NULL);
if (errno)
return -1;
/* Handle the EABI syscall convention. We do not
bother converting structures between the two
ABIs, but basic functionality should work even
if strace and the traced program have different
ABIs. */
if (scno == 0xef000000) {
scno = regs.ARM_r7;
} else {
if ((scno & 0x0ff00000) != 0x0f900000) {
fprintf(stderr, "syscall: unknown syscall trap 0x%08lx\n",
scno);
return -1;
}
/*
* Fixup the syscall number
*/
scno &= 0x000fffff;
}
}
if (scno & 0x0f0000) {
/*
* Handle ARM specific syscall
*/
update_personality(tcp, 1);
scno &= 0x0000ffff;
} else
update_personality(tcp, 0);
} else {
fprintf(stderr, "pid %d stray syscall entry\n", tcp->pid);
tcp->flags |= TCB_INSYSCALL;
}
#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) ®s) < 0)
return -1;
a3 = regs[REG_A3];
r2 = regs[REG_V0];
scno = r2;
if (!SCNO_IN_RANGE(scno)) {
if (a3 == 0 || a3 == -1) {
if (debug_flag)
fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
return 0;
}
}
#elif defined(MIPS)
if (upeek(tcp, REG_A3, &a3) < 0)
return -1;
if (upeek(tcp, REG_V0, &scno) < 0)
return -1;
if (!SCNO_IN_RANGE(scno)) {
if (a3 == 0 || a3 == -1) {
if (debug_flag)
fprintf(stderr, "stray syscall exit: v0 = %ld\n", scno);
return 0;
}
}
#elif defined(ALPHA)
if (upeek(tcp, REG_A3, &a3) < 0)
return -1;