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bsd-user: Start translation of arch-specific sysctls 

Intercept some syscalls that we need to translate (like the archiecture
we're running on) and translate them. These are only the simplest ones
so far.

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 dd7a627ac7
commit 248a485bf6
1 changed files with 143 additions and 2 deletions
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145
bsd-user/freebsd/os-sys.c
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@ -67,13 +67,13 @@ static const int host_ctl_size[CTLTYPE + 1] = {
*/
static const abi_ulong guest_max_mem = UINT32_MAX - 0x100c000 + 1;
static abi_ulong G_GNUC_UNUSED cap_memory(uint64_t mem)
static abi_ulong cap_memory(uint64_t mem)
{
return MIN(guest_max_mem, mem);
}
#endif
static abi_ulong G_GNUC_UNUSED scale_to_guest_pages(uint64_t pages)
static abi_ulong scale_to_guest_pages(uint64_t pages)
{
/* Scale pages from host to guest */
pages = muldiv64(pages, qemu_real_host_page_size(), TARGET_PAGE_SIZE);
@ -263,6 +263,146 @@ static abi_long G_GNUC_UNUSED do_freebsd_sysctl_oid(CPUArchState *env, int32_t *
oidfmt(snamep, namelen, NULL, &kind);
/* Handle some arch/emulator dependent sysctl()'s here. */
switch (snamep[0]) {
case CTL_KERN:
switch (snamep[1]) {
case KERN_USRSTACK:
if (oldlen) {
(*(abi_ulong *)holdp) = tswapal(TARGET_USRSTACK);
}
holdlen = sizeof(abi_ulong);
ret = 0;
goto out;
case KERN_PS_STRINGS:
if (oldlen) {
(*(abi_ulong *)holdp) = tswapal(TARGET_PS_STRINGS);
}
holdlen = sizeof(abi_ulong);
ret = 0;
goto out;
default:
break;
}
break;
case CTL_HW:
switch (snamep[1]) {
case HW_MACHINE:
holdlen = sizeof(TARGET_HW_MACHINE);
if (holdp) {
strlcpy(holdp, TARGET_HW_MACHINE, oldlen);
}
ret = 0;
goto out;
case HW_MACHINE_ARCH:
{
holdlen = sizeof(TARGET_HW_MACHINE_ARCH);
if (holdp) {
strlcpy(holdp, TARGET_HW_MACHINE_ARCH, oldlen);
}
ret = 0;
goto out;
}
case HW_NCPU:
if (oldlen) {
(*(abi_int *)holdp) = tswap32(bsd_get_ncpu());
}
holdlen = sizeof(int32_t);
ret = 0;
goto out;
#if defined(TARGET_ARM)
case HW_FLOATINGPT:
if (oldlen) {
ARMCPU *cpu = env_archcpu(env);
*(abi_int *)holdp = cpu_isar_feature(aa32_vfp, cpu);
}
holdlen = sizeof(abi_int);
ret = 0;
goto out;
#endif
#ifdef TARGET_ABI32
case HW_PHYSMEM:
case HW_USERMEM:
case HW_REALMEM:
holdlen = sizeof(abi_ulong);
ret = 0;
if (oldlen) {
int mib[2] = {snamep[0], snamep[1]};
unsigned long lvalue;
size_t len = sizeof(lvalue);
if (sysctl(mib, 2, &lvalue, &len, NULL, 0) == -1) {
ret = -1;
} else {
lvalue = cap_memory(lvalue);
(*(abi_ulong *)holdp) = tswapal((abi_ulong)lvalue);
}
}
goto out;
#endif
default:
{
static int oid_hw_availpages;
static int oid_hw_pagesizes;
if (!oid_hw_availpages) {
int real_oid[CTL_MAXNAME + 2];
size_t len = sizeof(real_oid) / sizeof(int);
if (sysctlnametomib("hw.availpages", real_oid, &len) >= 0) {
oid_hw_availpages = real_oid[1];
}
}
if (!oid_hw_pagesizes) {
int real_oid[CTL_MAXNAME + 2];
size_t len = sizeof(real_oid) / sizeof(int);
if (sysctlnametomib("hw.pagesizes", real_oid, &len) >= 0) {
oid_hw_pagesizes = real_oid[1];
}
}
if (oid_hw_availpages && snamep[1] == oid_hw_availpages) {
long lvalue;
size_t len = sizeof(lvalue);
if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1) {
ret = -1;
} else {
if (oldlen) {
lvalue = scale_to_guest_pages(lvalue);
(*(abi_ulong *)holdp) = tswapal((abi_ulong)lvalue);
}
holdlen = sizeof(abi_ulong);
ret = 0;
}
goto out;
}
if (oid_hw_pagesizes && snamep[1] == oid_hw_pagesizes) {
if (oldlen) {
(*(abi_ulong *)holdp) = tswapal((abi_ulong)TARGET_PAGE_SIZE);
((abi_ulong *)holdp)[1] = 0;
}
holdlen = sizeof(abi_ulong) * 2;
ret = 0;
goto out;
}
break;
}
}
break;
default:
break;
}
#ifdef TARGET_ABI32
/*
@ -326,6 +466,7 @@ static abi_long G_GNUC_UNUSED do_freebsd_sysctl_oid(CPUArchState *env, int32_t *
}
}
out:
*holdlenp = holdlen;
return ret;
}