Functions "print_ioctl()" and "print_syscall_ret_ioctl()" are used
to print arguments of "ioctl()" with "-strace". These functions
use "thunk_print()", which is defined in "thunk.c", to print the
contents of ioctl's third arguments that are not basic types.
However, this function doesn't handle ioctls of group ioctl_tty which
are used for terminals and serial lines. These ioctls use a type
"struct termios" which thunk type is defined in a non standard
way using "STRUCT_SPECIAL()". This means that this type is not decoded
regularly using "thunk_convert()" and uses special converting functions
"target_to_host_termios()" and "host_to_target_termios()", which are defined
in "syscall.c" to decode it's values.
For simillar reasons, this type is also not printed regularly using
"thunk_print()". That is the reason why a separate printing function
"print_termios()" is defined in file "strace.c". This function decodes
and prints flag values of the "termios" structure.
Implementation notes:
Function "print_termios()" was implemented in "strace.c" using
an existing function "print_flags()" to print flag values of
"struct termios" fields. Also, recently implemented function
"print_enums()" was also used to print enumareted values which
are contained in the fields of 'struct termios'.
These flag values were defined using an existing macro "FLAG_TARGET()"
that generates aproppriate target flag values and string representations
of these flags. Also, the recently defined macro "ENUM_TARGET()" was
used to generate aproppriate enumarated values and their respective
string representations.
Function "print_termios()" was declared in "qemu.h" so that it can
be accessed in "syscall.c". Type "StructEntry" defined in
"exec/user/thunk.h" contains information that is used to decode
structure values. Field "void print(void *arg)" was added in this
structure as a special print function. Also, function "thunk_print()"
was changed a little so that it uses this special print function
in case it is defined. This printing function was instantiated with
the defined "print_termios()" in "syscall.c" in "struct_termios_def".
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200723210233.349690-4-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This patch implements functionality for strace argument printing for ioctls.
When running ioctls through qemu with "-strace", they get printed in format:
"ioctl(fd_num,0x*,0x*) = ret_value"
where the request code an the ioctl's third argument get printed in a hexadicemal
format. This patch changes that by enabling strace to print both the request code
name and the contents of the third argument. For example, when running ioctl
RTC_SET_TIME with "-strace", with changes from this patch, it gets printed in
this way:
"ioctl(3,RTC_SET_TIME,{12,13,15,20,10,119,0,0,0}) = 0"
In case of IOC_R type ioctls, the contents of the third argument get printed
after the return value, and the argument inside the ioctl call gets printed
as pointer in hexadecimal format. For example, when running RTC_RD_TIME with
"-strace", with changes from this patch, it gets printed in this way:
"ioctl(3,RTC_RD_TIME,0x40800374) = 0 ({22,9,13,11,5,120,0,0,0})"
In case of IOC_RW type ioctls, the contents of the third argument get printed
both inside the ioctl call and after the return value.
Implementation notes:
Functions "print_ioctl()" and "print_syscall_ret_ioctl()", that are defined
in "strace.c", are listed in file "strace.list" as "call" and "result"
value for ioctl. Structure definition "IOCTLEntry" as well as predefined
values for IOC_R, IOC_W and IOC_RW were cut and pasted from file "syscall.c"
to file "qemu.h" so that they can be used by these functions to print the
contents of the third ioctl argument. Also, the "static" identifier for array
"ioctl_entries[]" was removed and this array was declared as "extern" in "qemu.h"
so that it can also be used by these functions. To decode the structure type
of the ioctl third argument, function "thunk_print()" was defined in file
"thunk.c" and its definition is somewhat simillar to that of function
"thunk_convert()".
Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200619124727.18080-3-filip.bozuta@syrmia.com>
[lv: fix close-bracket]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Note that since thunking occurs throughout the lifetime of the QEMU
instance, there is no matching 'free' to correct.
Signed-off-by: Aarushi Mehta <mehta.aaru20@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <5310bd5d152fa36c1828a7cbd19fc893739d1609.camel@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
thunk.c:91:32: warning: Call to 'malloc' has an allocation size of 0 bytes
se->field_offsets[i] = malloc(nb_fields * sizeof(int));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Reported-by: Clang Static Analyzer
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
The target_to_host_bitmask() and host_to_target_bitmask() functions
and the associated struct bitmask_transtbl are completely generic,
but for historical reasons the target related fields and parameters
are named 'x86' and the host related fields are named 'alpha'.
Rename them to 'target' and 'host'.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
The thunk_type_size_array() and thunk_type_align_array() functions
are only provided if NO_THUNK_TYPE_SIZE is not defined. However
nothing in the codebase defines that, and so in fact these functions
are always present. Drop the unnecessary #ifdefs.
(Over a decade ago thunk.h used to be included by some softmmu
files, which defined NO_THUNK_TYPE_SIZE, but these includes are
long gone; see for instance commit f193c7979c2f7.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.
This commit was created with scripts/clean-includes.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1454089805-5470-16-git-send-email-peter.maydell@linaro.org
We store all struct types in an array of static size without ever
checking whether we overrun it. Of course some day someone (like me
in another, ancient ALSA enabling patch set) will run into the limit
without realizing it.
So let's make the allocation dynamic. We already know the number of
structs that we want to allocate, so we only need to pass the variable
into the respective piece of code.
Also, to ensure we don't accidently overwrite random memory, add some
asserts to sanity check whether a thunk is actually part of our array.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
The compat LOOP_SET_STATUS ioctl uses struct old_dev_t in its passed
struct. That variable type is vastly different between different
architectures. Implement wrapping around it so we can use it.
This fixes running arm kpartx on an x86_64 host for me.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
The attached patch updates the FSF address in the GPL/LGPL boilerplate
in most GPL/LGPLed files, and also in COPYING.LIB.
Signed-off-by: Stuart Brady <stuart.brady@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6162 c046a42c-6fe2-441c-8c8c-71466251a162
which included commits to RCS files with non-trunk default branches.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3 c046a42c-6fe2-441c-8c8c-71466251a162
Filip Bozuta