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]);
19 offset = tcp->ext_arg[1];
20 whence = tcp->u_arg[2];
21 if (whence == SEEK_SET)
22 tprintf(", %llu, ", offset);
24 tprintf(", %lld, ", offset);
25 printxval(whence_codes, whence, "SEEK_???");
27 return RVAL_DECODED | RVAL_LUDECIMAL;
35 printfd(tcp, tcp->u_arg[0]);
36 offset = tcp->u_arg[1];
37 whence = tcp->u_arg[2];
38 if (whence == SEEK_SET)
39 tprintf(", %lu, ", offset);
41 tprintf(", %ld, ", offset);
42 printxval(whence_codes, whence, "SEEK_???");
44 return RVAL_DECODED | RVAL_UDECIMAL;
48 /* llseek syscall takes explicitly two ulong arguments hi, lo,
49 * rather than one 64-bit argument for which LONG_LONG works
50 * appropriate for the native byte order.
52 * See kernel's fs/read_write.c::SYSCALL_DEFINE5(llseek, ...)
54 * hi,lo are "unsigned longs" and combined exactly this way in kernel:
55 * ((loff_t) hi << 32) | lo
56 * Note that for architectures with kernel's long wider than userspace long
57 * (such as x32), combining code will use *kernel's*, i.e. *wide* longs
58 * for hi and lo. We would need to use tcp->ext_arg[N] on x32...
59 * ...however, x32 (and x86_64) does not _have_ llseek syscall as such.
64 printfd(tcp, tcp->u_arg[0]);
65 if (tcp->u_arg[4] == SEEK_SET)
67 ((long long) tcp->u_arg[1]) << 32 |
68 (unsigned long long) (unsigned) tcp->u_arg[2]);
71 ((long long) tcp->u_arg[1]) << 32 |
72 (unsigned long long) (unsigned) tcp->u_arg[2]);
74 printnum_int64(tcp, tcp->u_arg[3], "%" PRIu64);
76 printxval(whence_codes, tcp->u_arg[4], "SEEK_???");