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util.c
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util.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>
#include <fcntl.h>
#if HAVE_SYS_UIO_H
# include <sys/uio.h>
#endif
#if defined(IA64)
# include <asm/ptrace_offsets.h>
# include <asm/rse.h>
#endif
#ifdef HAVE_SYS_REG_H
# include <sys/reg.h>
#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
# ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS
# define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args
# endif
# include <linux/ptrace.h>
# undef ptrace_peeksiginfo_args
# undef ia64_fpreg
# undef pt_all_user_regs
#endif
int
string_to_uint(const char *str)
{
char *error;
long value;
if (!*str)
return -1;
errno = 0;
value = strtol(str, &error, 10);
if (errno || *error || value < 0 || (long)(int)value != value)
return -1;
return (int)value;
}
int
tv_nz(struct timeval *a)
{
return a->tv_sec || a->tv_usec;
}
int
tv_cmp(struct timeval *a, struct timeval *b)
{
if (a->tv_sec < b->tv_sec
|| (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec))
return -1;
if (a->tv_sec > b->tv_sec
|| (a->tv_sec == b->tv_sec && a->tv_usec > b->tv_usec))
return 1;
return 0;
}
double
tv_float(struct timeval *tv)
{
return tv->tv_sec + tv->tv_usec/1000000.0;
}
void
tv_add(struct timeval *tv, struct timeval *a, struct timeval *b)
{
tv->tv_sec = a->tv_sec + b->tv_sec;
tv->tv_usec = a->tv_usec + b->tv_usec;
if (tv->tv_usec >= 1000000) {
tv->tv_sec++;
tv->tv_usec -= 1000000;
}
}
void
tv_sub(struct timeval *tv, struct timeval *a, struct timeval *b)
{
tv->tv_sec = a->tv_sec - b->tv_sec;
tv->tv_usec = a->tv_usec - b->tv_usec;
if (((long) tv->tv_usec) < 0) {
tv->tv_sec--;
tv->tv_usec += 1000000;
}
}
void
tv_div(struct timeval *tv, struct timeval *a, int n)
{
tv->tv_usec = (a->tv_sec % n * 1000000 + a->tv_usec + n / 2) / n;
tv->tv_sec = a->tv_sec / n + tv->tv_usec / 1000000;
tv->tv_usec %= 1000000;
}
void
tv_mul(struct timeval *tv, struct timeval *a, int n)
{
tv->tv_usec = a->tv_usec * n;
tv->tv_sec = a->tv_sec * n + tv->tv_usec / 1000000;
tv->tv_usec %= 1000000;
}
const char *
xlookup(const struct xlat *xlat, int val)
{
for (; xlat->str != NULL; xlat++)
if (xlat->val == val)
return xlat->str;
return NULL;
}
#if !defined HAVE_STPCPY
char *
stpcpy(char *dst, const char *src)
{
while ((*dst = *src++) != '\0')
dst++;
return dst;
}
#endif
/* Find a next bit which is set.
* Starts testing at cur_bit.
* Returns -1 if no more bits are set.
*
* We never touch bytes we don't need to.
* On big-endian, array is assumed to consist of
* current_wordsize wide words: for example, is current_wordsize is 4,
* the bytes are walked in 3,2,1,0, 7,6,5,4, 11,10,9,8 ... sequence.
* On little-endian machines, word size is immaterial.
*/
int
next_set_bit(const void *bit_array, unsigned cur_bit, unsigned size_bits)
{
const unsigned endian = 1;
int little_endian = *(char*)&endian;
const uint8_t *array = bit_array;
unsigned pos = cur_bit / 8;
unsigned pos_xor_mask = little_endian ? 0 : current_wordsize-1;
for (;;) {
uint8_t bitmask;
uint8_t cur_byte;
if (cur_bit >= size_bits)
return -1;
cur_byte = array[pos ^ pos_xor_mask];
if (cur_byte == 0) {
cur_bit = (cur_bit + 8) & (-8);
pos++;
continue;
}
bitmask = 1 << (cur_bit & 7);
for (;;) {
if (cur_byte & bitmask)
return cur_bit;
cur_bit++;
if (cur_bit >= size_bits)
return -1;
bitmask <<= 1;
/* This check *can't be* optimized out: */
if (bitmask == 0)
break;
}
pos++;
}
}
/*
* Print entry in struct xlat table, if there.
*/
void
printxval(const struct xlat *xlat, int val, const char *dflt)
{
const char *str = xlookup(xlat, val);
if (str)
tprints(str);
else
tprintf("%#x /* %s */", val, dflt);
}
/*
* Print 64bit argument at position arg_no and return the index of the next
* argument.
*/
int
printllval(struct tcb *tcp, const char *format, int arg_no)
{
#if SIZEOF_LONG > 4 && SIZEOF_LONG == SIZEOF_LONG_LONG
# if SUPPORTED_PERSONALITIES > 1
if (current_wordsize > 4) {
# endif
tprintf(format, tcp->u_arg[arg_no]);
arg_no++;
# if SUPPORTED_PERSONALITIES > 1
} else {
# if defined(AARCH64) || defined(POWERPC64)
/* Align arg_no to the next even number. */
arg_no = (arg_no + 1) & 0xe;
# endif
tprintf(format, LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]));
arg_no += 2;
}
# endif /* SUPPORTED_PERSONALITIES */
#elif SIZEOF_LONG > 4
# error Unsupported configuration: SIZEOF_LONG > 4 && SIZEOF_LONG_LONG > SIZEOF_LONG
#elif defined LINUX_MIPSN32
tprintf(format, tcp->ext_arg[arg_no]);
arg_no++;
#elif defined X32
if (current_personality == 0) {
tprintf(format, tcp->ext_arg[arg_no]);
arg_no++;
} else {
tprintf(format, LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]));
arg_no += 2;
}
#else
# if defined __ARM_EABI__ || \
defined LINUX_MIPSO32 || \
defined POWERPC || \
defined XTENSA
/* Align arg_no to the next even number. */
arg_no = (arg_no + 1) & 0xe;
# endif
tprintf(format, LONG_LONG(tcp->u_arg[arg_no], tcp->u_arg[arg_no + 1]));
arg_no += 2;
#endif
return arg_no;
}
/*
* Interpret `xlat' as an array of flags
* print the entries whose bits are on in `flags'
* return # of flags printed.
*/
void
addflags(const struct xlat *xlat, int flags)
{
for (; xlat->str; xlat++) {
if (xlat->val && (flags & xlat->val) == xlat->val) {
tprintf("|%s", xlat->str);
flags &= ~xlat->val;
}
}
if (flags) {
tprintf("|%#x", flags);
}
}
/*
* Interpret `xlat' as an array of flags.
* Print to static string the entries whose bits are on in `flags'
* Return static string.
*/
const char *
sprintflags(const char *prefix, const struct xlat *xlat, int flags)
{
static char outstr[1024];
char *outptr;
int found = 0;
outptr = stpcpy(outstr, prefix);
for (; xlat->str; xlat++) {
if ((flags & xlat->val) == xlat->val) {
if (found)
*outptr++ = '|';
outptr = stpcpy(outptr, xlat->str);
found = 1;
flags &= ~xlat->val;
if (!flags)
break;
}
}
if (flags) {
if (found)
*outptr++ = '|';
outptr += sprintf(outptr, "%#x", flags);
}
return outstr;
}
int
printflags(const struct xlat *xlat, int flags, const char *dflt)
{
int n;
const char *sep;
if (flags == 0 && xlat->val == 0) {
tprints(xlat->str);
return 1;
}
sep = "";
for (n = 0; xlat->str; xlat++) {
if (xlat->val && (flags & xlat->val) == xlat->val) {
tprintf("%s%s", sep, xlat->str);
flags &= ~xlat->val;
sep = "|";
n++;
}
}
if (n) {
if (flags) {
tprintf("%s%#x", sep, flags);
n++;
}
} else {
if (flags) {
tprintf("%#x", flags);
if (dflt)
tprintf(" /* %s */", dflt);
} else {
if (dflt)
tprints("0");
}
}
return n;
}
void
printnum(struct tcb *tcp, long addr, const char *fmt)
{
long num;
if (!addr) {
tprints("NULL");
return;
}
if (umove(tcp, addr, &num) < 0) {
tprintf("%#lx", addr);
return;
}
tprints("[");
tprintf(fmt, num);
tprints("]");
}
void
printnum_int(struct tcb *tcp, long addr, const char *fmt)
{
int num;
if (!addr) {
tprints("NULL");
return;
}
if (umove(tcp, addr, &num) < 0) {
tprintf("%#lx", addr);
return;
}
tprints("[");
tprintf(fmt, num);
tprints("]");
}
void
printfd(struct tcb *tcp, int fd)
{
char path[PATH_MAX + 1];
if (show_fd_path && getfdpath(tcp, fd, path, sizeof(path)) >= 0)
tprintf("%d<%s>", fd, path);
else
tprintf("%d", fd);
}
void
printuid(const char *text, unsigned long uid)
{
tprintf((uid == -1) ? "%s%ld" : "%s%lu", text, uid);
}
/*
* Quote string `instr' of length `size'
* Write up to (3 + `size' * 4) bytes to `outstr' buffer.
* If `len' is -1, treat `instr' as a NUL-terminated string
* and quote at most (`size' - 1) bytes.
*
* Returns 0 if len == -1 and NUL was seen, 1 otherwise.
* Note that if len >= 0, always returns 1.
*/
int
string_quote(const char *instr, char *outstr, long len, int size)
{
const unsigned char *ustr = (const unsigned char *) instr;
char *s = outstr;
int usehex, c, i, eol;
eol = 0x100; /* this can never match a char */
if (len == -1) {
size--;
eol = '\0';
}
usehex = 0;
if (xflag > 1)
usehex = 1;
else if (xflag) {
/* Check for presence of symbol which require
to hex-quote the whole string. */
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
break;
/* Force hex unless c is printable or whitespace */
if (c > 0x7e) {
usehex = 1;
break;
}
/* In ASCII isspace is only these chars: "\t\n\v\f\r".
* They happen to have ASCII codes 9,10,11,12,13.
*/
if (c < ' ' && (unsigned)(c - 9) >= 5) {
usehex = 1;
break;
}
}
}
*s++ = '\"';
if (usehex) {
/* Hex-quote the whole string. */
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
goto asciz_ended;
*s++ = '\\';
*s++ = 'x';
*s++ = "0123456789abcdef"[c >> 4];
*s++ = "0123456789abcdef"[c & 0xf];
}
} else {
for (i = 0; i < size; ++i) {
c = ustr[i];
/* Check for NUL-terminated string. */
if (c == eol)
goto asciz_ended;
switch (c) {
case '\"': case '\\':
*s++ = '\\';
*s++ = c;
break;
case '\f':
*s++ = '\\';
*s++ = 'f';
break;
case '\n':
*s++ = '\\';
*s++ = 'n';
break;
case '\r':
*s++ = '\\';
*s++ = 'r';
break;
case '\t':
*s++ = '\\';
*s++ = 't';
break;
case '\v':
*s++ = '\\';
*s++ = 'v';
break;
default:
if (c >= ' ' && c <= 0x7e)
*s++ = c;
else {
/* Print \octal */
*s++ = '\\';
if (i + 1 < size
&& ustr[i + 1] >= '0'
&& ustr[i + 1] <= '9'
) {
/* Print \ooo */
*s++ = '0' + (c >> 6);
*s++ = '0' + ((c >> 3) & 0x7);
} else {
/* Print \[[o]o]o */
if ((c >> 3) != 0) {
if ((c >> 6) != 0)
*s++ = '0' + (c >> 6);
*s++ = '0' + ((c >> 3) & 0x7);
}
}
*s++ = '0' + (c & 0x7);
}
break;
}
}
}
*s++ = '\"';
*s = '\0';
/* Return zero if we printed entire ASCIZ string (didn't truncate it) */
if (len == -1 && ustr[i] == '\0') {
/* We didn't see NUL yet (otherwise we'd jump to 'asciz_ended')
* but next char is NUL.
*/
return 0;
}
return 1;
asciz_ended:
*s++ = '\"';
*s = '\0';
/* Return zero: we printed entire ASCIZ string (didn't truncate it) */
return 0;
}
/*
* Print path string specified by address `addr' and length `n'.
* If path length exceeds `n', append `...' to the output.
*/
void
printpathn(struct tcb *tcp, long addr, int n)
{
char path[MAXPATHLEN + 1];
int nul_seen;
if (!addr) {
tprints("NULL");
return;
}
/* Cap path length to the path buffer size */
if (n > sizeof path - 1)
n = sizeof path - 1;
/* Fetch one byte more to find out whether path length > n. */
nul_seen = umovestr(tcp, addr, n + 1, path);
if (nul_seen < 0)
tprintf("%#lx", addr);
else {
char *outstr;
path[n] = '\0';
n++;
outstr = alloca(4 * n); /* 4*(n-1) + 3 for quotes and NUL */
string_quote(path, outstr, -1, n);
tprints(outstr);
if (!nul_seen)
tprints("...");
}
}
void
printpath(struct tcb *tcp, long addr)
{
/* Size must correspond to char path[] size in printpathn */
printpathn(tcp, addr, MAXPATHLEN);
}
/*
* Print string specified by address `addr' and length `len'.
* If `len' < 0, treat the string as a NUL-terminated string.
* If string length exceeds `max_strlen', append `...' to the output.
*/
void
printstr(struct tcb *tcp, long addr, long len)
{
static char *str = NULL;
static char *outstr;
int size;
int ellipsis;
if (!addr) {
tprints("NULL");
return;
}
/* Allocate static buffers if they are not allocated yet. */
if (!str) {
unsigned int outstr_size = 4 * max_strlen + /*for quotes and NUL:*/ 3;
if (outstr_size / 4 != max_strlen)
die_out_of_memory();
str = malloc(max_strlen + 1);
if (!str)
die_out_of_memory();
outstr = malloc(outstr_size);
if (!outstr)
die_out_of_memory();
}
if (len == -1) {
/*
* Treat as a NUL-terminated string: fetch one byte more
* because string_quote() quotes one byte less.
*/
size = max_strlen + 1;
if (umovestr(tcp, addr, size, str) < 0) {
tprintf("%#lx", addr);
return;
}
}
else {
size = max_strlen;
if (size > (unsigned long)len)
size = (unsigned long)len;
if (umoven(tcp, addr, size, str) < 0) {
tprintf("%#lx", addr);
return;
}
}
/* If string_quote didn't see NUL and (it was supposed to be ASCIZ str
* or we were requested to print more than -s NUM chars)...
*/
ellipsis = (string_quote(str, outstr, len, size) &&
(len < 0 || len > max_strlen));
tprints(outstr);
if (ellipsis)
tprints("...");
}
#if HAVE_SYS_UIO_H
void
dumpiov(struct tcb *tcp, int len, long addr)
{
#if SUPPORTED_PERSONALITIES > 1
union {
struct { u_int32_t base; u_int32_t len; } *iov32;
struct { u_int64_t base; u_int64_t len; } *iov64;
} iovu;
#define iov iovu.iov64
#define sizeof_iov \
(current_wordsize == 4 ? sizeof(*iovu.iov32) : sizeof(*iovu.iov64))
#define iov_iov_base(i) \
(current_wordsize == 4 ? (uint64_t) iovu.iov32[i].base : iovu.iov64[i].base)
#define iov_iov_len(i) \
(current_wordsize == 4 ? (uint64_t) iovu.iov32[i].len : iovu.iov64[i].len)
#else
struct iovec *iov;
#define sizeof_iov sizeof(*iov)
#define iov_iov_base(i) iov[i].iov_base
#define iov_iov_len(i) iov[i].iov_len
#endif
int i;
unsigned size;
size = sizeof_iov * len;
/* Assuming no sane program has millions of iovs */
if ((unsigned)len > 1024*1024 /* insane or negative size? */
|| (iov = malloc(size)) == NULL) {
fprintf(stderr, "Out of memory\n");
return;
}
if (umoven(tcp, addr, size, (char *) iov) >= 0) {
for (i = 0; i < len; i++) {
/* include the buffer number to make it easy to
* match up the trace with the source */
tprintf(" * %lu bytes in buffer %d\n",
(unsigned long)iov_iov_len(i), i);
dumpstr(tcp, (long) iov_iov_base(i),
iov_iov_len(i));
}
}
free(iov);
#undef sizeof_iov
#undef iov_iov_base
#undef iov_iov_len
#undef iov
}
#endif
void
dumpstr(struct tcb *tcp, long addr, int len)
{
static int strsize = -1;
static unsigned char *str;
char outbuf[
(
(sizeof(
"xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx "
"1234567890123456") + /*in case I'm off by few:*/ 4)
/*align to 8 to make memset easier:*/ + 7) & -8
];
const unsigned char *src;
int i;
memset(outbuf, ' ', sizeof(outbuf));
if (strsize < len + 16) {
free(str);
str = malloc(len + 16);
if (!str) {
strsize = -1;
fprintf(stderr, "Out of memory\n");
return;
}
strsize = len + 16;
}
if (umoven(tcp, addr, len, (char *) str) < 0)
return;
/* Space-pad to 16 bytes */
i = len;
while (i & 0xf)
str[i++] = ' ';
i = 0;
src = str;
while (i < len) {
char *dst = outbuf;
/* Hex dump */
do {
if (i < len) {
*dst++ = "0123456789abcdef"[*src >> 4];
*dst++ = "0123456789abcdef"[*src & 0xf];
}
else {
*dst++ = ' ';
*dst++ = ' ';
}
dst++; /* space is there by memset */
i++;
if ((i & 7) == 0)
dst++; /* space is there by memset */
src++;
} while (i & 0xf);
/* ASCII dump */
i -= 16;
src -= 16;
do {
if (*src >= ' ' && *src < 0x7f)
*dst++ = *src;
else
*dst++ = '.';
src++;
} while (++i & 0xf);
*dst = '\0';
tprintf(" | %05x %s |\n", i - 16, outbuf);
}
}
#ifdef HAVE_PROCESS_VM_READV
/* C library supports this, but the kernel might not. */
static bool process_vm_readv_not_supported = 0;
#else
/* Need to do this since process_vm_readv() is not yet available in libc.
* When libc is be updated, only "static bool process_vm_readv_not_supported"
* line should remain.
*/
#if !defined(__NR_process_vm_readv)
# if defined(I386)
# define __NR_process_vm_readv 347
# elif defined(X86_64)
# define __NR_process_vm_readv 310
# elif defined(POWERPC)
# define __NR_process_vm_readv 351
# endif
#endif
#if defined(__NR_process_vm_readv)
static bool process_vm_readv_not_supported = 0;
/* Have to avoid duplicating with the C library headers. */
static ssize_t strace_process_vm_readv(pid_t pid,
const struct iovec *lvec,
unsigned long liovcnt,
const struct iovec *rvec,
unsigned long riovcnt,
unsigned long flags)
{
return syscall(__NR_process_vm_readv, (long)pid, lvec, liovcnt, rvec, riovcnt, flags);
}
#define process_vm_readv strace_process_vm_readv
#else
static bool process_vm_readv_not_supported = 1;
# define process_vm_readv(...) (errno = ENOSYS, -1)
#endif
#endif /* end of hack */
#define PAGMASK (~(PAGSIZ - 1))
/*
* move `len' bytes of data from process `pid'
* at address `addr' to our space at `laddr'
*/
int
umoven(struct tcb *tcp, long addr, int len, char *laddr)
{
int pid = tcp->pid;
int n, m, nread;
union {
long val;
char x[sizeof(long)];
} u;
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize < sizeof(addr))
addr &= (1ul << 8 * current_wordsize) - 1;
#endif
if (!process_vm_readv_not_supported) {
struct iovec local[1], remote[1];
int r;
local[0].iov_base = laddr;
remote[0].iov_base = (void*)addr;
local[0].iov_len = remote[0].iov_len = len;
r = process_vm_readv(pid, local, 1, remote, 1, 0);
if (r == len)
return 0;
if (r >= 0) {
error_msg("umoven: short read (%d < %d) @0x%lx",
r, len, addr);
return -1;
}
switch (errno) {
case ENOSYS:
process_vm_readv_not_supported = 1;
break;
case ESRCH:
/* the process is gone */
return -1;
case EFAULT: case EIO: case EPERM:
/* address space is inaccessible */
return -1;
default:
/* all the rest is strange and should be reported */
perror_msg("process_vm_readv");
return -1;
}
}
nread = 0;
if (addr & (sizeof(long) - 1)) {
/* addr not a multiple of sizeof(long) */
n = addr - (addr & -sizeof(long)); /* residue */
addr &= -sizeof(long); /* residue */
errno = 0;
u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0);
switch (errno) {
case 0:
break;
case ESRCH: case EINVAL:
/* these could be seen if the process is gone */
return -1;
case EFAULT: case EIO: case EPERM:
/* address space is inaccessible */
return -1;
default:
/* all the rest is strange and should be reported */
perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx",
pid, addr);
return -1;
}
m = MIN(sizeof(long) - n, len);
memcpy(laddr, &u.x[n], m);
addr += sizeof(long);
laddr += m;
nread += m;
len -= m;
}
while (len) {
errno = 0;
u.val = ptrace(PTRACE_PEEKDATA, pid, (char *) addr, 0);
switch (errno) {
case 0:
break;
case ESRCH: case EINVAL:
/* these could be seen if the process is gone */
return -1;
case EFAULT: case EIO: case EPERM:
/* address space is inaccessible */
if (nread) {
perror_msg("umoven: short read (%d < %d) @0x%lx",
nread, nread + len, addr - nread);
}
return -1;
default:
/* all the rest is strange and should be reported */
perror_msg("umoven: PTRACE_PEEKDATA pid:%d @0x%lx",
pid, addr);
return -1;
}
m = MIN(sizeof(long), len);
memcpy(laddr, u.x, m);
addr += sizeof(long);
laddr += m;
nread += m;
len -= m;
}
return 0;
}
/*
* Like `umove' but make the additional effort of looking
* for a terminating zero byte.
*
* Returns < 0 on error, > 0 if NUL was seen,
* (TODO if useful: return count of bytes including NUL),
* else 0 if len bytes were read but no NUL byte seen.
*
* Note: there is no guarantee we won't overwrite some bytes
* in laddr[] _after_ terminating NUL (but, of course,
* we never write past laddr[len-1]).
*/
int
umovestr(struct tcb *tcp, long addr, int len, char *laddr)
{
#if SIZEOF_LONG == 4
const unsigned long x01010101 = 0x01010101ul;
const unsigned long x80808080 = 0x80808080ul;
#elif SIZEOF_LONG == 8
const unsigned long x01010101 = 0x0101010101010101ul;
const unsigned long x80808080 = 0x8080808080808080ul;
#else
# error SIZEOF_LONG > 8
#endif
int pid = tcp->pid;
int n, m, nread;
union {
unsigned long val;
char x[sizeof(long)];
} u;
#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4
if (current_wordsize < sizeof(addr))
addr &= (1ul << 8 * current_wordsize) - 1;
#endif
nread = 0;
if (!process_vm_readv_not_supported) {
struct iovec local[1], remote[1];
local[0].iov_base = laddr;
remote[0].iov_base = (void*)addr;
while (len > 0) {
int end_in_page;
int r;
int chunk_len;
/* Don't read kilobytes: most strings are short */
chunk_len = len;
if (chunk_len > 256)
chunk_len = 256;
/* Don't cross pages. I guess otherwise we can get EFAULT
* and fail to notice that terminating NUL lies
* in the existing (first) page.
* (I hope there aren't arches with pages < 4K)
*/