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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) 1999-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <fcntl.h>
#include <sys/uio.h>
SYS_FUNC(read)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
} else {
if (syserror(tcp))
printaddr(tcp->u_arg[1]);
else
printstrn(tcp, tcp->u_arg[1], tcp->u_rval);
tprintf(", %" PRI_klu, tcp->u_arg[2]);
}
return 0;
}
SYS_FUNC(write)
{
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
printstrn(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprintf(", %" PRI_klu, tcp->u_arg[2]);
return RVAL_DECODED;
}
struct print_iovec_config {
enum iov_decode decode_iov;
kernel_ulong_t data_size;
};
static bool
print_iovec(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
{
const kernel_ulong_t *iov;
kernel_ulong_t iov_buf[2], len;
struct print_iovec_config *c = data;
if (elem_size < sizeof(iov_buf)) {
iov_buf[0] = ((unsigned int *) elem_buf)[0];
iov_buf[1] = ((unsigned int *) elem_buf)[1];
iov = iov_buf;
} else {
iov = elem_buf;
}
tprint_struct_begin();
tprints_field_name("iov_base");
len = iov[1];
switch (c->decode_iov) {
case IOV_DECODE_STR:
if (len > c->data_size)
len = c->data_size;
if (c->data_size != (kernel_ulong_t) -1)
c->data_size -= len;
printstrn(tcp, iov[0], len);
break;
case IOV_DECODE_NETLINK:
if (len > c->data_size)
len = c->data_size;
if (c->data_size != (kernel_ulong_t) -1)
c->data_size -= len;
/* assume that the descriptor is 1st syscall argument */
decode_netlink(tcp, tcp->u_arg[0], iov[0], len);
break;
default:
printaddr(iov[0]);
break;
}
tprint_struct_next();
tprints_field_name("iov_len");
tprintf("%" PRI_klu, iov[1]);
tprint_struct_end();
return true;
}
/*
* data_size limits the cumulative size of printed data.
* Example: recvmsg returning a short read.
*/
void
tprint_iov_upto(struct tcb *const tcp, const kernel_ulong_t len,
const kernel_ulong_t addr, const enum iov_decode decode_iov,
const kernel_ulong_t data_size)
{
kernel_ulong_t iov[2];
struct print_iovec_config config = {
.decode_iov = decode_iov, .data_size = data_size
};
print_array(tcp, addr, len, iov, current_wordsize * 2,
tfetch_mem_ignore_syserror, print_iovec, &config);
}
SYS_FUNC(readv)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
} else {
tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
syserror(tcp) ? IOV_DECODE_ADDR :
IOV_DECODE_STR, tcp->u_rval);
tprintf(", %" PRI_klu, tcp->u_arg[2]);
}
return 0;
}
SYS_FUNC(writev)
{
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
tprintf(", %" PRI_klu, tcp->u_arg[2]);
return RVAL_DECODED;
}
SYS_FUNC(pread)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
} else {
if (syserror(tcp))
printaddr(tcp->u_arg[1]);
else
printstrn(tcp, tcp->u_arg[1], tcp->u_rval);
tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
printllval(tcp, "%lld", 3);
}
return 0;
}
SYS_FUNC(pwrite)
{
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
printstrn(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
printllval(tcp, "%lld", 3);
return RVAL_DECODED;
}
static void
print_lld_from_low_high_val(struct tcb *tcp, int arg)
{
#if SIZEOF_KERNEL_LONG_T > 4
# ifndef current_klongsize
if (current_klongsize < SIZEOF_KERNEL_LONG_T) {
tprintf("%" PRI_kld, (tcp->u_arg[arg + 1] << 32)
| tcp->u_arg[arg]);
} else
# endif /* !current_klongsize */
{
tprintf("%" PRI_kld, tcp->u_arg[arg]);
}
#else /* SIZEOF_KERNEL_LONG_T == 4 */
tprintf("%lld",
((long long) tcp->u_arg[arg + 1] << 32)
| ((long long) tcp->u_arg[arg]));
#endif
}
#include "xlat/rwf_flags.h"
static int
do_preadv(struct tcb *tcp, const int flags_arg)
{
if (entering(tcp)) {
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
} else {
kernel_ulong_t len =
truncate_kulong_to_current_wordsize(tcp->u_arg[2]);
tprint_iov_upto(tcp, len, tcp->u_arg[1],
syserror(tcp) ? IOV_DECODE_ADDR :
IOV_DECODE_STR, tcp->u_rval);
tprintf(", %" PRI_klu ", ", len);
print_lld_from_low_high_val(tcp, 3);
if (flags_arg >= 0) {
tprints(", ");
printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
}
}
return 0;
}
SYS_FUNC(preadv)
{
return do_preadv(tcp, -1);
}
static int
do_pwritev(struct tcb *tcp, const int flags_arg)
{
kernel_ulong_t len =
truncate_kulong_to_current_wordsize(tcp->u_arg[2]);
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
tprint_iov(tcp, len, tcp->u_arg[1], IOV_DECODE_STR);
tprintf(", %" PRI_klu ", ", len);
print_lld_from_low_high_val(tcp, 3);
if (flags_arg >= 0) {
tprints(", ");
printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
}
return RVAL_DECODED;
}
SYS_FUNC(pwritev)
{
return do_pwritev(tcp, -1);
}
/*
* x32 is the only architecture where preadv2 takes 5 arguments
* instead of 6, see preadv64v2 in kernel sources.
* Likewise, x32 is the only architecture where pwritev2 takes 5 arguments
* instead of 6, see pwritev64v2 in kernel sources.
*/
#if defined X86_64
# define PREADV2_PWRITEV2_FLAGS_ARG_NO (current_personality == 2 ? 4 : 5)
#elif defined X32
# define PREADV2_PWRITEV2_FLAGS_ARG_NO (current_personality == 0 ? 4 : 5)
#else
# define PREADV2_PWRITEV2_FLAGS_ARG_NO 5
#endif
SYS_FUNC(preadv2)
{
return do_preadv(tcp, PREADV2_PWRITEV2_FLAGS_ARG_NO);
}
SYS_FUNC(pwritev2)
{
return do_pwritev(tcp, PREADV2_PWRITEV2_FLAGS_ARG_NO);
}
#include "xlat/splice_flags.h"
SYS_FUNC(tee)
{
/* int fd_in */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
/* int fd_out */
printfd(tcp, tcp->u_arg[1]);
tprints(", ");
/* size_t len */
tprintf("%" PRI_klu ", ", tcp->u_arg[2]);
/* unsigned int flags */
printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
return RVAL_DECODED;
}
SYS_FUNC(splice)
{
/* int fd_in */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
/* loff_t *off_in */
printnum_int64(tcp, tcp->u_arg[1], "%" PRId64);
tprints(", ");
/* int fd_out */
printfd(tcp, tcp->u_arg[2]);
tprints(", ");
/* loff_t *off_out */
printnum_int64(tcp, tcp->u_arg[3], "%" PRId64);
tprints(", ");
/* size_t len */
tprintf("%" PRI_klu ", ", tcp->u_arg[4]);
/* unsigned int flags */
printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
return RVAL_DECODED;
}
SYS_FUNC(vmsplice)
{
/* int fd */
printfd(tcp, tcp->u_arg[0]);
tprints(", ");
/* const struct iovec *iov, unsigned long nr_segs */
tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], IOV_DECODE_STR);
tprintf(", %" PRI_klu ", ", tcp->u_arg[2]);
/* unsigned int flags */
printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
return RVAL_DECODED;
}
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