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linux-user: Add an api to print enumareted argument values with strace 

This patch introduces a type 'struct enums' and function 'print_enums()'
that can be used to print enumerated argument values of some syscalls
in strace. This can be used in future strace implementations.

Also, macros 'ENUM_GENERIC()', 'ENUM_TARGET()' and 'ENUM_END', are
introduced to enable automatic generation of aproppriate enumarated
values and their repsective string representations (these macros are
exactly the same as 'FLAG_GENERIC()', 'FLAG_TARGET()' and 'FLAG_END').

Future patches are planned to modify all existing print functions in
'strace.c' that print arguments of syscalls with enumerated values to
use this new api.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200811164553.27713-5-Filip.Bozuta@syrmia.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Filip Bozuta 2020-08-11 18:45:52 +02:00 committed by Laurent Vivier
parent 02e5d7d78e
commit 45f567994c
1 changed files with 31 additions and 0 deletions
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31
linux-user/strace.c
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@ -52,9 +52,23 @@ struct flags {
/* end of flags array */
#define FLAG_END { 0, NULL }
/* Structure used to translate enumerated values into strings */
struct enums {
abi_long e_value; /* enum value */
const char *e_string; /* stringified enum */
};
/* common enums for all architectures */
#define ENUM_GENERIC(name) { name, #name }
/* target specific enums */
#define ENUM_TARGET(name) { TARGET_ ## name, #name }
/* end of enums array */
#define ENUM_END { 0, NULL }
UNUSED static const char *get_comma(int);
UNUSED static void print_pointer(abi_long, int);
UNUSED static void print_flags(const struct flags *, abi_long, int);
UNUSED static void print_enums(const struct enums *, abi_long, int);
UNUSED static void print_at_dirfd(abi_long, int);
UNUSED static void print_file_mode(abi_long, int);
UNUSED static void print_open_flags(abi_long, int);
@ -1252,6 +1266,23 @@ print_flags(const struct flags *f, abi_long flags, int last)
}
}
static void
print_enums(const struct enums *e, abi_long enum_arg, int last)
{
for (; e->e_string != NULL; e++) {
if (e->e_value == enum_arg) {
qemu_log("%s", e->e_string);
break;
}
}
if (e->e_string == NULL) {
qemu_log("%#x", (unsigned int)enum_arg);
}
qemu_log("%s", get_comma(last));
}
static void
print_at_dirfd(abi_long dirfd, int last)
{