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bsd-user: common routine do_freebsd_sysctl_oid for all sysctl variants 

do_freebsd_sysctl_oid filters out some of the binary and special sysctls
where host != target. None of the sysctls that have to be translated from
host to target are handled here.

Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de>
Co-Authored-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Co-Authored-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Juergen Lock 2023-02-10 15:24:45 -07:00 committed by Warner Losh
parent 0394968a44
commit dd7a627ac7
1 changed files with 86 additions and 4 deletions
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90
bsd-user/freebsd/os-sys.c
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@ -112,7 +112,7 @@ static abi_ulong h2g_ulong_sat(u_long ul)
* sysctl, see /sys/kern/kern_sysctl.c:sysctl_sysctl_oidfmt() (compare to
* src/sbin/sysctl/sysctl.c)
*/
static int G_GNUC_UNUSED oidfmt(int *oid, int len, char *fmt, uint32_t *kind)
static int oidfmt(int *oid, int len, char *fmt, uint32_t *kind)
{
int qoid[CTL_MAXNAME + 2];
uint8_t buf[BUFSIZ];
@ -154,7 +154,7 @@ static int G_GNUC_UNUSED oidfmt(int *oid, int len, char *fmt, uint32_t *kind)
*
* For opaque data, per sysctl OID converts take care of it.
*/
static void G_GNUC_UNUSED h2g_old_sysctl(void *holdp, size_t *holdlen, uint32_t kind)
static void h2g_old_sysctl(void *holdp, size_t *holdlen, uint32_t kind)
{
size_t len;
int hlen, glen;
@ -233,7 +233,7 @@ static void G_GNUC_UNUSED h2g_old_sysctl(void *holdp, size_t *holdlen, uint32_t
/*
* Convert the undocmented name2oid sysctl data for the target.
*/
static inline void G_GNUC_UNUSED sysctl_name2oid(uint32_t *holdp, size_t holdlen)
static inline void sysctl_name2oid(uint32_t *holdp, size_t holdlen)
{
size_t i, num = holdlen / sizeof(uint32_t);
@ -242,12 +242,94 @@ static inline void G_GNUC_UNUSED sysctl_name2oid(uint32_t *holdp, size_t holdlen
}
}
static inline void G_GNUC_UNUSED sysctl_oidfmt(uint32_t *holdp)
static inline void sysctl_oidfmt(uint32_t *holdp)
{
/* byte swap the kind */
holdp[0] = tswap32(holdp[0]);
}
static abi_long G_GNUC_UNUSED do_freebsd_sysctl_oid(CPUArchState *env, int32_t *snamep,
int32_t namelen, void *holdp, size_t *holdlenp, void *hnewp,
size_t newlen)
{
uint32_t kind = 0;
abi_long ret;
size_t holdlen, oldlen;
#ifdef TARGET_ABI32
void *old_holdp;
#endif
holdlen = oldlen = *holdlenp;
oidfmt(snamep, namelen, NULL, &kind);
/* Handle some arch/emulator dependent sysctl()'s here. */
#ifdef TARGET_ABI32
/*
* For long and ulong with a 64-bit host and a 32-bit target we have to do
* special things. holdlen here is the length provided by the target to the
* system call. So we allocate a buffer twice as large because longs are
* twice as big on the host which will be writing them. In h2g_old_sysctl
* we'll adjust them and adjust the length.
*/
if (kind == CTLTYPE_LONG || kind == CTLTYPE_ULONG) {
old_holdp = holdp;
holdlen = holdlen * 2;
holdp = g_malloc(holdlen);
}
#endif
ret = get_errno(sysctl(snamep, namelen, holdp, &holdlen, hnewp, newlen));
if (!ret && (holdp != 0)) {
if (snamep[0] == CTL_SYSCTL) {
switch (snamep[1]) {
case CTL_SYSCTL_NEXT:
case CTL_SYSCTL_NAME2OID:
case CTL_SYSCTL_NEXTNOSKIP:
/*
* All of these return an OID array, so we need to convert to
* target.
*/
sysctl_name2oid(holdp, holdlen);
break;
case CTL_SYSCTL_OIDFMT:
/* Handle oidfmt */
sysctl_oidfmt(holdp);
break;
case CTL_SYSCTL_OIDDESCR:
case CTL_SYSCTL_OIDLABEL:
default:
/* Handle it based on the type */
h2g_old_sysctl(holdp, &holdlen, kind);
/* NB: None of these are LONG or ULONG */
break;
}
} else {
/*
* Need to convert from host to target. All the weird special cases
* are handled above.
*/
h2g_old_sysctl(holdp, &holdlen, kind);
#ifdef TARGET_ABI32
/*
* For the 32-bit on 64-bit case, for longs we need to copy the
* now-converted buffer to the target and free the buffer.
*/
if (kind == CTLTYPE_LONG || kind == CTLTYPE_ULONG) {
memcpy(old_holdp, holdp, holdlen);
g_free(holdp);
holdp = old_holdp;
}
#endif
}
}
*holdlenp = holdlen;
return ret;
}
/* sysarch() is architecture dependent. */
abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2)
{