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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>
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| .. | ||
| aarch64 | ||
| alpha | ||
| arm | ||
| cris | ||
| generic | ||
| host | ||
| hppa | ||
| i386 | ||
| m68k | ||
| microblaze | ||
| mips | ||
| mips64 | ||
| nios2 | ||
| openrisc | ||
| ppc | ||
| riscv | ||
| s390x | ||
| sh4 | ||
| sparc | ||
| sparc64 | ||
| tilegx | ||
| x86_64 | ||
| xtensa | ||
| cpu_loop-common.h | ||
| elfload.c | ||
| errno_defs.h | ||
| exit.c | ||
| fd-trans.c | ||
| fd-trans.h | ||
| flat.h | ||
| flatload.c | ||
| ioctls.h | ||
| linux_loop.h | ||
| linuxload.c | ||
| main.c | ||
| meson.build | ||
| mmap.c | ||
| qemu.h | ||
| safe-syscall.S | ||
| signal-common.h | ||
| signal.c | ||
| socket.h | ||
| strace.c | ||
| strace.list | ||
| syscall.c | ||
| syscall_defs.h | ||
| syscall_types.h | ||
| target_flat.h | ||
| trace-events | ||
| trace.h | ||
| uaccess.c | ||
| uname.c | ||
| uname.h | ||
| vm86.c | ||