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feat(libkernel): implement sysctlnametomib for the sysctl names AnyPS5 serves #5502

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Merged
adriadam10 merged 1 commit into from
Oct 14, 2026
Merged

feat(libkernel): implement sysctlnametomib for the sysctl names AnyPS5 serves #5502

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35 changes: 35 additions & 0 deletions core/libs/prx/libkernel/System/src/SystemConfiguration.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -247,4 +247,39 @@ int APS5_VABI sceKernelGetSystemSwVersion_nid_postfix(SceKernelSystemSwVersion*
version->version = 0x01000000;
return 0;
}

int APS5_VABI sysctlnametomib_nid_postfix(const char* name, int* mib, std::size_t* size) {
struct KnownName {
const char* name;
int mib[3];
std::size_t length;
};
static constexpr KnownName known[] = {
{"hw.model", {6, 2}, 2},
{"hw.ncpu", {6, 3}, 2},
{"hw.physmem", {6, 5}, 2},
{"hw.realmem", {6, 12}, 2},
{"kern.arandom", {1, 37}, 2},
{"kern.proc.pathname", {1, 14, 12}, 3},
};
constexpr std::size_t MaximumPath = 1024;
if (name == nullptr || size == nullptr) throw std::invalid_argument(std::string(__func__) + ": null name or size");
const std::size_t nameLength = strnlen(name, MaximumPath);
if (nameLength == MaximumPath) {
*__error_nid_postfix() = 63;
return -1;
}
if (nameLength == 0 || std::strcmp(name, "machdep.cacheline_size") == 0) {
*__error_nid_postfix() = 2;
return -1;
}
for (const auto& entry : known) {
if (std::strcmp(name, entry.name) != 0) continue;
std::size_t bytes = *size * sizeof(int);
const int result = CopyOut(entry.mib, entry.length * sizeof(int), mib, &bytes);
*size = bytes / sizeof(int);
return result;
}
throw std::runtime_error(std::string(__func__) + ": unsupported name " + name);
}
}
94 changes: 94 additions & 0 deletions core/libs/tests/GuestSystemConfiguration.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ int APS5_VABI getpagesize_nid_postfix();
int* APS5_VABI __error_nid_postfix();
int APS5_VABI sysctl_nid_postfix(const int*, std::uint32_t, void*, std::size_t*, const void*, std::size_t);
int APS5_VABI sysctlbyname_nid_postfix(const char*, void*, std::size_t*, const void*, std::size_t);
int APS5_VABI sysctlnametomib_nid_postfix(const char*, int*, std::size_t*);
int APS5_VABI sceKernelGetSystemSwVersion_nid_postfix(SceKernelSystemSwVersion*);
int APS5_VABI getpid_nid_postfix();
std::uint64_t APS5_VABI sceKernelGetTscFrequency(void);
Expand Down Expand Up @@ -301,6 +302,98 @@ static void CheckArandomSysctl() {
Require(sysctl_nid_postfix(mib, 2, first, nullptr, nullptr, 0) == 0);
Require(*__error_nid_postfix() == 13);
}
static void CheckNameToMib() {
struct Expected {
const char* name;
int mib[3];
std::size_t length;
};
const Expected expected[] = {
{"hw.model", {6, 2}, 2},
{"hw.ncpu", {6, 3}, 2},
{"hw.physmem", {6, 5}, 2},
{"hw.realmem", {6, 12}, 2},
{"kern.arandom", {1, 37}, 2},
{"kern.proc.pathname", {1, 14, 12}, 3},
};
*__error_nid_postfix() = 13;
for (const auto& entry : expected) {
std::size_t size = 0;
Require(sysctlnametomib_nid_postfix(entry.name, nullptr, &size) == 0 && size == entry.length);
int mib[5] = {0x5a5a5a5a, 0x5a5a5a5a, 0x5a5a5a5a, 0x5a5a5a5a, 0x5a5a5a5a};
size = 5;
Require(sysctlnametomib_nid_postfix(entry.name, mib, &size) == 0 && size == entry.length);
Require(std::memcmp(mib, entry.mib, entry.length * sizeof(int)) == 0 && mib[entry.length] == 0x5a5a5a5a);
}
Require(*__error_nid_postfix() == 13);

int mib[4] = {};
std::size_t size = 4;
Require(sysctlnametomib_nid_postfix("hw.ncpu", mib, &size) == 0 && size == 2);
int processors = 0;
std::size_t length = sizeof(processors);
Require(sysctl_nid_postfix(mib, static_cast<std::uint32_t>(size), &processors, &length, nullptr, 0) == 0);
Require(processors == static_cast<int>(sysconf_nid_postfix(58)));
size = 4;
Require(sysctlnametomib_nid_postfix("hw.realmem", mib, &size) == 0 && size == 2);
std::uint64_t realmem = 0;
length = sizeof(realmem);
Require(sysctl_nid_postfix(mib, static_cast<std::uint32_t>(size), &realmem, &length, nullptr, 0) == 0);
std::uint64_t namedRealmem = 0;
length = sizeof(namedRealmem);
Require(sysctlbyname_nid_postfix("hw.realmem", &namedRealmem, &length, nullptr, 0) == 0 && realmem == namedRealmem);
size = 4;
Require(sysctlnametomib_nid_postfix("kern.proc.pathname", mib, &size) == 0 && size == 3);
mib[3] = -1;
char path[32] = {};
length = sizeof(path);
Require(sysctl_nid_postfix(mib, 4, path, &length, nullptr, 0) == 0 && std::strcmp(path, "/app0/eboot.bin") == 0);

int truncated[3] = {0x5a5a5a5a, 0x5a5a5a5a, 0x5a5a5a5a};
size = 1;
Require(sysctlnametomib_nid_postfix("hw.ncpu", truncated, &size) == -1 && *__error_nid_postfix() == 12);
Require(size == 1 && truncated[0] == 6 && truncated[1] == 0x5a5a5a5a);
size = 0;
Require(sysctlnametomib_nid_postfix("hw.ncpu", truncated, &size) == -1 && *__error_nid_postfix() == 12);
Require(size == 0 && truncated[0] == 6);

size = 4;
Require(sysctlnametomib_nid_postfix("", mib, &size) == -1 && *__error_nid_postfix() == 2);
Require(sysctlnametomib_nid_postfix("machdep.cacheline_size", mib, &size) == -1 && *__error_nid_postfix() == 2);
char tooLong[1025];
std::memset(tooLong, 'a', sizeof(tooLong) - 1);
tooLong[sizeof(tooLong) - 1] = 0;
Require(sysctlnametomib_nid_postfix(tooLong, mib, &size) == -1 && *__error_nid_postfix() == 63);
tooLong[1023] = 0;
bool threw = false;
try {
sysctlnametomib_nid_postfix(tooLong, mib, &size);
} catch (const std::runtime_error&) {
threw = true;
}
Require(threw);
threw = false;
try {
sysctlnametomib_nid_postfix(nullptr, mib, &size);
} catch (const std::invalid_argument&) {
threw = true;
}
Require(threw);
threw = false;
try {
sysctlnametomib_nid_postfix("hw.ncpu", mib, nullptr);
} catch (const std::invalid_argument&) {
threw = true;
}
Require(threw);
threw = false;
try {
sysctlnametomib_nid_postfix("kern.cp_times", mib, &size);
} catch (const std::runtime_error&) {
threw = true;
}
Require(threw);
}
int main() {
CheckProcessorCountSysctl();
CheckPhysicalMemorySysctl(5, "hw.physmem");
Expand All @@ -317,6 +410,7 @@ int main() {
CheckSdkVersionSysctl();
CheckOvercommitSysctl();
CheckArandomSysctl();
CheckNameToMib();
*__error_nid_postfix() = 13;
Require(sysconf_nid_postfix(3) == 128);
Require(sysconf_nid_postfix(47) == 0x4000);
Expand Down
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