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author | Filip Bozuta <Filip.Bozuta@syrmia.com> | 2020-06-19 14:33:31 +0200 |
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committer | Laurent Vivier <laurent@vivier.eu> | 2020-06-29 13:08:48 +0200 |
commit | f4d92c5e9f24efdc83f24a2fd99c37a8609787ee (patch) | |
tree | df57d25088fc8a0146646161a1a1b0d656058d97 /linux-user/qemu.h | |
parent | 5844f4bc4111248b9de0c2efa422cafcdaa69cf1 (diff) | |
download | qemu-f4d92c5e9f24efdc83f24a2fd99c37a8609787ee.zip qemu-f4d92c5e9f24efdc83f24a2fd99c37a8609787ee.tar.gz qemu-f4d92c5e9f24efdc83f24a2fd99c37a8609787ee.tar.bz2 |
linux-user: Add strace support for printing arguments of fallocate()
This patch implements strace argument printing functionality for following syscall:
*fallocate - manipulate file space
int fallocate(int fd, int mode, off_t offset, off_t len)
man page: https://www.man7.org/linux/man-pages/man2/fallocate.2.html
Implementation notes:
This syscall's second argument "mode" is composed of predefined values
which represent flags that determine the type of operation that is
to be performed on the file space. For that reason, a printing
function "print_fallocate" was stated in file "strace.list". This printing
function uses an already existing function "print_flags()" to print flags of
the "mode" argument. These flags are stated inside an array "falloc_flags"
that contains values of type "struct flags". These values are instantiated
using an existing macro "FLAG_GENERIC()". Most of these flags are defined
after kernel version 3.0 which is why they are enwrapped in an #ifdef
directive.
The syscall's third ant fourth argument are of type "off_t" which can
cause variations between 32/64-bit architectures. To handle this variation,
function "target_offset64()" was copied from file "strace.c" and used in
"print_fallocate" to print "off_t" arguments for 32-bit architectures.
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200619123331.17387-7-filip.bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/qemu.h')
-rw-r--r-- | linux-user/qemu.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 8f938b8..be67391 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -670,6 +670,22 @@ static inline int is_error(abi_long ret) return (abi_ulong)ret >= (abi_ulong)(-4096); } +#if TARGET_ABI_BITS == 32 +static inline uint64_t target_offset64(uint32_t word0, uint32_t word1) +{ +#ifdef TARGET_WORDS_BIGENDIAN + return ((uint64_t)word0 << 32) | word1; +#else + return ((uint64_t)word1 << 32) | word0; +#endif +} +#else /* TARGET_ABI_BITS == 32 */ +static inline uint64_t target_offset64(uint64_t word0, uint64_t word1) +{ + return word0; +} +#endif /* TARGET_ABI_BITS != 32 */ + /** * preexit_cleanup: housekeeping before the guest exits * |