diff options
Diffstat (limited to 'bsd-user')
| -rw-r--r-- | bsd-user/freebsd/os-sys.c | 131 |
1 files changed, 127 insertions, 4 deletions
diff --git a/bsd-user/freebsd/os-sys.c b/bsd-user/freebsd/os-sys.c index a4f3fd8091..2e0a6c058d 100644 --- a/bsd-user/freebsd/os-sys.c +++ b/bsd-user/freebsd/os-sys.c @@ -29,7 +29,7 @@ * Compare with sys/kern_sysctl.c ctl_size * Note: Not all types appear to be used in-tree. */ -static const int G_GNUC_UNUSED guest_ctl_size[CTLTYPE + 1] = { +static const int guest_ctl_size[CTLTYPE + 1] = { [CTLTYPE_INT] = sizeof(abi_int), [CTLTYPE_UINT] = sizeof(abi_uint), [CTLTYPE_LONG] = sizeof(abi_long), @@ -44,7 +44,7 @@ static const int G_GNUC_UNUSED guest_ctl_size[CTLTYPE + 1] = { [CTLTYPE_U64] = sizeof(uint64_t), }; -static const int G_GNUC_UNUSED host_ctl_size[CTLTYPE + 1] = { +static const int host_ctl_size[CTLTYPE + 1] = { [CTLTYPE_INT] = sizeof(int), [CTLTYPE_UINT] = sizeof(u_int), [CTLTYPE_LONG] = sizeof(long), @@ -86,7 +86,7 @@ static abi_ulong G_GNUC_UNUSED scale_to_guest_pages(uint64_t pages) #ifdef TARGET_ABI32 /* Used only for TARGET_ABI32 */ -static abi_long G_GNUC_UNUSED h2g_long_sat(long l) +static abi_long h2g_long_sat(long l) { if (l > INT32_MAX) { l = INT32_MAX; @@ -96,7 +96,7 @@ static abi_long G_GNUC_UNUSED h2g_long_sat(long l) return l; } -static abi_ulong G_GNUC_UNUSED h2g_ulong_sat(u_long ul) +static abi_ulong h2g_ulong_sat(u_long ul) { return MIN(ul, UINT32_MAX); } @@ -107,6 +107,129 @@ static abi_ulong G_GNUC_UNUSED h2g_ulong_sat(u_long ul) */ #define bsd_get_ncpu() 1 +/* + * This uses the undocumented oidfmt interface to find the kind of a requested + * 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) +{ + int qoid[CTL_MAXNAME + 2]; + uint8_t buf[BUFSIZ]; + int i; + size_t j; + + qoid[0] = CTL_SYSCTL; + qoid[1] = CTL_SYSCTL_OIDFMT; + memcpy(qoid + 2, oid, len * sizeof(int)); + + j = sizeof(buf); + i = sysctl(qoid, len + 2, buf, &j, 0, 0); + if (i) { + return i; + } + + if (kind) { + *kind = *(uint32_t *)buf; + } + + if (fmt) { + strcpy(fmt, (char *)(buf + sizeof(uint32_t))); + } + return 0; +} + +/* + * Convert the old value from host to guest. + * + * For LONG and ULONG on ABI32, we need to 'down convert' the 8 byte quantities + * to 4 bytes. The caller setup a buffer in host memory to get this data from + * the kernel and pass it to us. We do the down conversion and adjust the length + * so the caller knows what to write as the returned length into the target when + * it copies the down converted values into the target. + * + * For normal integral types, we just need to byte swap. No size changes. + * + * For strings and node data, there's no conversion needed. + * + * 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) +{ + size_t len; + int hlen, glen; + uint8_t *hp, *gp; + + /* + * Although rare, we can have arrays of sysctl. Both sysctl_old_ddb in + * kern_sysctl.c and show_var in sbin/sysctl/sysctl.c have code that loops + * this way. *holdlen has been set by the kernel to the host's length. + * Only LONG and ULONG on ABI32 have different sizes: see below. + */ + gp = hp = (uint8_t *)holdp; + len = 0; + hlen = host_ctl_size[kind & CTLTYPE]; + glen = guest_ctl_size[kind & CTLTYPE]; + + /* + * hlen == 0 for CTLTYPE_STRING and CTLTYPE_NODE, which need no conversion + * as well as CTLTYPE_OPAQUE, which needs special converters. + */ + if (hlen == 0) { + return; + } + + while (len < *holdlen) { + if (hlen == glen) { + switch (hlen) { + case 1: + /* Nothing needed: no byteswapping and assigning in place */ + break; + case 2: + *(uint16_t *)gp = tswap16(*(uint16_t *)hp); + break; + case 4: + *(uint32_t *)gp = tswap32(*(uint32_t *)hp); + break; + case 8: + *(uint64_t *)gp = tswap64(*(uint64_t *)hp); + break; + default: + g_assert_not_reached(); + } + } else { +#ifdef TARGET_ABI32 + /* + * Saturating assignment for the only two types that differ between + * 32-bit and 64-bit machines. All other integral types have the + * same, fixed size and will be converted w/o loss of precision + * in the above switch. + */ + switch (kind & CTLTYPE) { + case CTLTYPE_LONG: + *(abi_long *)gp = tswap32(h2g_long_sat(*(long *)hp)); + break; + case CTLTYPE_ULONG: + *(abi_ulong *)gp = tswap32(h2g_ulong_sat(*(u_long *)hp)); + break; + default: + g_assert_not_reached(); + } +#else + g_assert_not_reached(); +#endif + } + gp += glen; + hp += hlen; + len += hlen; + } +#ifdef TARGET_ABI32 + if (hlen != glen) { + *holdlen = (*holdlen / hlen) * glen; + } +#endif +} + /* sysarch() is architecture dependent. */ abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2) { |