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linux-user: Simplify host <-> target errno conversion using macros

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Convert the host_to_target_errno_table[] array to a switch
case to allow compiler optimizations (such noticing the identity
function when host and guest errnos match). Extract the errnos
list as to a new includible unit, using a generic macro. Remove
the code related to target_to_host_errno_table[] initialization.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210708170550.1846343-8-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Philippe Mathieu-Daudé 2021-07-08 19:05:49 +02:00 • committed by Laurent Vivier
parent f317c0ee57
commit 3ffe3268ea
2 changed files with 154 additions and 145 deletions
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159
linux-user/syscall.c
View file

@ -509,150 +509,26 @@ static inline int next_free_host_timer(void)
#define ERRNO_TABLE_SIZE 1200
/* target_to_host_errno_table[] is initialized from
* host_to_target_errno_table[] in syscall_init(). */
static uint16_t target_to_host_errno_table[ERRNO_TABLE_SIZE] = {
};
/*
* This list is the union of errno values overridden in asm-<arch>/errno.h
* minus the errnos that are not actually generic to all archs.
*/
static uint16_t host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
[EAGAIN] = TARGET_EAGAIN,
[EIDRM] = TARGET_EIDRM,
[ECHRNG] = TARGET_ECHRNG,
[EL2NSYNC] = TARGET_EL2NSYNC,
[EL3HLT] = TARGET_EL3HLT,
[EL3RST] = TARGET_EL3RST,
[ELNRNG] = TARGET_ELNRNG,
[EUNATCH] = TARGET_EUNATCH,
[ENOCSI] = TARGET_ENOCSI,
[EL2HLT] = TARGET_EL2HLT,
[EDEADLK] = TARGET_EDEADLK,
[ENOLCK] = TARGET_ENOLCK,
[EBADE] = TARGET_EBADE,
[EBADR] = TARGET_EBADR,
[EXFULL] = TARGET_EXFULL,
[ENOANO] = TARGET_ENOANO,
[EBADRQC] = TARGET_EBADRQC,
[EBADSLT] = TARGET_EBADSLT,
[EBFONT] = TARGET_EBFONT,
[ENOSTR] = TARGET_ENOSTR,
[ENODATA] = TARGET_ENODATA,
[ETIME] = TARGET_ETIME,
[ENOSR] = TARGET_ENOSR,
[ENONET] = TARGET_ENONET,
[ENOPKG] = TARGET_ENOPKG,
[EREMOTE] = TARGET_EREMOTE,
[ENOLINK] = TARGET_ENOLINK,
[EADV] = TARGET_EADV,
[ESRMNT] = TARGET_ESRMNT,
[ECOMM] = TARGET_ECOMM,
[EPROTO] = TARGET_EPROTO,
[EDOTDOT] = TARGET_EDOTDOT,
[EMULTIHOP] = TARGET_EMULTIHOP,
[EBADMSG] = TARGET_EBADMSG,
[ENAMETOOLONG] = TARGET_ENAMETOOLONG,
[EOVERFLOW] = TARGET_EOVERFLOW,
[ENOTUNIQ] = TARGET_ENOTUNIQ,
[EBADFD] = TARGET_EBADFD,
[EREMCHG] = TARGET_EREMCHG,
[ELIBACC] = TARGET_ELIBACC,
[ELIBBAD] = TARGET_ELIBBAD,
[ELIBSCN] = TARGET_ELIBSCN,
[ELIBMAX] = TARGET_ELIBMAX,
[ELIBEXEC] = TARGET_ELIBEXEC,
[EILSEQ] = TARGET_EILSEQ,
[ENOSYS] = TARGET_ENOSYS,
[ELOOP] = TARGET_ELOOP,
[ERESTART] = TARGET_ERESTART,
[ESTRPIPE] = TARGET_ESTRPIPE,
[ENOTEMPTY] = TARGET_ENOTEMPTY,
[EUSERS] = TARGET_EUSERS,
[ENOTSOCK] = TARGET_ENOTSOCK,
[EDESTADDRREQ] = TARGET_EDESTADDRREQ,
[EMSGSIZE] = TARGET_EMSGSIZE,
[EPROTOTYPE] = TARGET_EPROTOTYPE,
[ENOPROTOOPT] = TARGET_ENOPROTOOPT,
[EPROTONOSUPPORT] = TARGET_EPROTONOSUPPORT,
[ESOCKTNOSUPPORT] = TARGET_ESOCKTNOSUPPORT,
[EOPNOTSUPP] = TARGET_EOPNOTSUPP,
[EPFNOSUPPORT] = TARGET_EPFNOSUPPORT,
[EAFNOSUPPORT] = TARGET_EAFNOSUPPORT,
[EADDRINUSE] = TARGET_EADDRINUSE,
[EADDRNOTAVAIL] = TARGET_EADDRNOTAVAIL,
[ENETDOWN] = TARGET_ENETDOWN,
[ENETUNREACH] = TARGET_ENETUNREACH,
[ENETRESET] = TARGET_ENETRESET,
[ECONNABORTED] = TARGET_ECONNABORTED,
[ECONNRESET] = TARGET_ECONNRESET,
[ENOBUFS] = TARGET_ENOBUFS,
[EISCONN] = TARGET_EISCONN,
[ENOTCONN] = TARGET_ENOTCONN,
[EUCLEAN] = TARGET_EUCLEAN,
[ENOTNAM] = TARGET_ENOTNAM,
[ENAVAIL] = TARGET_ENAVAIL,
[EISNAM] = TARGET_EISNAM,
[EREMOTEIO] = TARGET_EREMOTEIO,
[EDQUOT] = TARGET_EDQUOT,
[ESHUTDOWN] = TARGET_ESHUTDOWN,
[ETOOMANYREFS] = TARGET_ETOOMANYREFS,
[ETIMEDOUT] = TARGET_ETIMEDOUT,
[ECONNREFUSED] = TARGET_ECONNREFUSED,
[EHOSTDOWN] = TARGET_EHOSTDOWN,
[EHOSTUNREACH] = TARGET_EHOSTUNREACH,
[EALREADY] = TARGET_EALREADY,
[EINPROGRESS] = TARGET_EINPROGRESS,
[ESTALE] = TARGET_ESTALE,
[ECANCELED] = TARGET_ECANCELED,
[ENOMEDIUM] = TARGET_ENOMEDIUM,
[EMEDIUMTYPE] = TARGET_EMEDIUMTYPE,
#ifdef ENOKEY
[ENOKEY] = TARGET_ENOKEY,
#endif
#ifdef EKEYEXPIRED
[EKEYEXPIRED] = TARGET_EKEYEXPIRED,
#endif
#ifdef EKEYREVOKED
[EKEYREVOKED] = TARGET_EKEYREVOKED,
#endif
#ifdef EKEYREJECTED
[EKEYREJECTED] = TARGET_EKEYREJECTED,
#endif
#ifdef EOWNERDEAD
[EOWNERDEAD] = TARGET_EOWNERDEAD,
#endif
#ifdef ENOTRECOVERABLE
[ENOTRECOVERABLE] = TARGET_ENOTRECOVERABLE,
#endif
#ifdef ENOMSG
[ENOMSG] = TARGET_ENOMSG,
#endif
#ifdef ERFKILL
[ERFKILL] = TARGET_ERFKILL,
#endif
#ifdef EHWPOISON
[EHWPOISON] = TARGET_EHWPOISON,
#endif
};
static inline int host_to_target_errno(int err)
static inline int host_to_target_errno(int host_errno)
{
if (err >= 0 && err < ERRNO_TABLE_SIZE &&
host_to_target_errno_table[err]) {
return host_to_target_errno_table[err];
switch (host_errno) {
#define E(X) case X: return TARGET_##X;
#include "errnos.c.inc"
#undef E
default:
return host_errno;
}
return err;
}
static inline int target_to_host_errno(int err)
static inline int target_to_host_errno(int target_errno)
{
if (err >= 0 && err < ERRNO_TABLE_SIZE &&
target_to_host_errno_table[err]) {
return target_to_host_errno_table[err];
switch (target_errno) {
#define E(X) case TARGET_##X: return X;
#include "errnos.c.inc"
#undef E
default:
return target_errno;
}
return err;
}
static inline abi_long get_errno(abi_long ret)
@ -7102,7 +6978,6 @@ void syscall_init(void)
IOCTLEntry *ie;
const argtype *arg_type;
int size;
int i;
thunk_init(STRUCT_MAX);
@ -7112,12 +6987,6 @@ void syscall_init(void)
#undef STRUCT
#undef STRUCT_SPECIAL
/* Build target_to_host_errno_table[] table from
* host_to_target_errno_table[]. */
for (i = 0; i < ERRNO_TABLE_SIZE; i++) {
target_to_host_errno_table[host_to_target_errno_table[i]] = i;
}
/* we patch the ioctl size if necessary. We rely on the fact that
no ioctl has all the bits at '1' in the size field */
ie = ioctl_entries;