3 #include "xlat/whence_codes.h"
5 /* Linux kernel has exactly one version of lseek:
6 * fs/read_write.c::SYSCALL_DEFINE3(lseek, unsigned, fd, off_t, offset, unsigned, origin)
7 * In kernel, off_t is always the same as (kernel's) long
8 * (see include/uapi/asm-generic/posix_types.h),
9 * which means that on x32 we need to use tcp->ext_arg[N] to get offset argument.
10 * Use test/x32_lseek.c to test lseek decoding.
12 #if defined(LINUX_MIPSN32) || defined(X32)
18 printfd(tcp, tcp->u_arg[0]);
20 /* tcp->ext_arg is not initialized for i386 personality */
21 if (current_personality == 1)
22 offset = tcp->u_arg[1];
25 offset = tcp->ext_arg[1];
26 whence = tcp->u_arg[2];
27 if (whence == SEEK_SET)
28 tprintf(", %llu, ", offset);
30 tprintf(", %lld, ", offset);
31 printxval(whence_codes, whence, "SEEK_???");
33 return RVAL_DECODED | RVAL_LUDECIMAL;
41 printfd(tcp, tcp->u_arg[0]);
42 offset = tcp->u_arg[1];
43 whence = tcp->u_arg[2];
44 if (whence == SEEK_SET)
45 tprintf(", %lu, ", offset);
47 tprintf(", %ld, ", offset);
48 printxval(whence_codes, whence, "SEEK_???");
50 return RVAL_DECODED | RVAL_UDECIMAL;
54 /* llseek syscall takes explicitly two ulong arguments hi, lo,
55 * rather than one 64-bit argument for which LONG_LONG works
56 * appropriate for the native byte order.
58 * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
60 * hi,lo are "unsigned longs" and combined exactly this way in kernel:
61 * ((loff_t) hi << 32) | lo
62 * Note that for architectures with kernel's long wider than userspace long
63 * (such as x32), combining code will use *kernel's*, i.e. *wide* longs
64 * for hi and lo. We would need to use tcp->ext_arg[N] on x32...
65 * ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
70 printfd(tcp, tcp->u_arg[0]);
71 if (tcp->u_arg[4] == SEEK_SET)
73 ((long long) tcp->u_arg[1]) << 32 |
74 (unsigned long long) (unsigned) tcp->u_arg[2]);
77 ((long long) tcp->u_arg[1]) << 32 |
78 (unsigned long long) (unsigned) tcp->u_arg[2]);
80 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
82 printxval(whence_codes, tcp->u_arg[4], "SEEK_???");