mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-09 09:00:18 +02:00
297 lines
8.9 KiB
C++
297 lines
8.9 KiB
C++
#include "VDSO_Emulation.h"
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#include "FEXCore/IR/IR.h"
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#include "Tests/LinuxSyscalls/x32/Types.h"
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#include <FEXCore/Config/Config.h>
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#include <FEXCore/Utils/MathUtils.h>
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#include <FEXCore/Utils/LogManager.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <filesystem>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <unistd.h>
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namespace FEX::VDSO {
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using TimeType = decltype(::time)*;
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using GetTimeOfDayType = decltype(::gettimeofday)*;
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using ClockGetTimeType = decltype(::clock_gettime)*;
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using ClockGetResType = decltype(::clock_getres)*;
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using GetCPUType = decltype(::getcpu)*;
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TimeType TimePtr = ::time;
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GetTimeOfDayType GetTimeOfDayPtr = ::gettimeofday;
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ClockGetTimeType ClockGetTimePtr = ::clock_gettime;
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ClockGetResType ClockGetResPtr = ::clock_getres;
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GetCPUType GetCPUPtr = ::getcpu;
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static void time(void* ArgsRV) {
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struct ArgsRV_t {
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time_t *a_0;
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uint64_t rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = TimePtr(args->a_0);
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}
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static void gettimeofday(void* ArgsRV) {
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struct ArgsRV_t {
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struct timeval *tv;
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struct timezone *tz;
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uint64_t rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = GetTimeOfDayPtr(args->tv, args->tz);
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}
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static void clock_gettime(void* ArgsRV) {
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struct ArgsRV_t {
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clockid_t clk_id;
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struct timespec *tp;
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uint64_t rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = ClockGetTimePtr(args->clk_id, args->tp);
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}
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static void clock_getres(void* ArgsRV) {
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struct ArgsRV_t {
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clockid_t clk_id;
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struct timespec *tp;
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uint64_t rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = ClockGetResPtr(args->clk_id, args->tp);
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}
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static void getcpu(void* ArgsRV) {
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struct ArgsRV_t {
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uint32_t *cpu;
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uint32_t *node;
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uint64_t rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = GetCPUPtr(args->cpu, args->node);
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}
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namespace x32 {
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static void time(void* ArgsRV) {
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struct ArgsRV_t {
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HLE::x32::compat_ptr<FEX::HLE::x32::old_time32_t> a_0;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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time_t Host{};
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args->rv = TimePtr(&Host);
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if (args->a_0) {
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*args->a_0 = Host;
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}
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}
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static void gettimeofday(void* ArgsRV) {
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struct ArgsRV_t {
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HLE::x32::compat_ptr<FEX::HLE::x32::timeval32> tv;
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HLE::x32::compat_ptr<struct timezone> tz;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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struct timeval tv64{};
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struct timeval *tv_ptr{};
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if (args->tv) {
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tv_ptr = &tv64;
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}
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args->rv = GetTimeOfDayPtr(tv_ptr, args->tz);
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if (args->tv) {
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*args->tv = tv64;
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}
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}
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static void clock_gettime(void* ArgsRV) {
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struct ArgsRV_t {
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clockid_t clk_id;
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HLE::x32::compat_ptr<HLE::x32::timespec32> tp;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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struct timespec tp64{};
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args->rv = ClockGetTimePtr(args->clk_id, &tp64);
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if (args->tp) {
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*args->tp = tp64;
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}
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}
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static void clock_gettime64(void* ArgsRV) {
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struct ArgsRV_t {
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clockid_t clk_id;
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HLE::x32::compat_ptr<struct timespec> tp;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = ClockGetTimePtr(args->clk_id, args->tp);
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}
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static void clock_getres(void* ArgsRV) {
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struct ArgsRV_t {
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clockid_t clk_id;
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HLE::x32::compat_ptr<HLE::x32::timespec32> tp;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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struct timespec tp64{};
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args->rv = ClockGetResPtr(args->clk_id, &tp64);
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if (args->tp) {
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*args->tp = tp64;
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}
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}
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static void getcpu(void* ArgsRV) {
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struct ArgsRV_t {
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HLE::x32::compat_ptr<uint32_t> cpu;
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HLE::x32::compat_ptr<uint32_t> node;
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int rv;
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} *args = reinterpret_cast<ArgsRV_t*>(ArgsRV);
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args->rv = GetCPUPtr(args->cpu, args->node);
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}
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}
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void LoadHostVDSO() {
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void *vdso = dlopen("linux-vdso.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso) {
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vdso = dlopen("linux-gate.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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}
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if (!vdso) {
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// We couldn't load VDSO, fallback to C implementations. Which will still be faster than emulated libc versions.
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LogMan::Msg::IFmt("linux-vdso implementation falling back to libc. Consider enabling VDSO in your kernel.");
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return;
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}
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auto SymbolPtr = dlsym(vdso, "__vdso_time");
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if (SymbolPtr) {
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TimePtr = reinterpret_cast<TimeType>(SymbolPtr);
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}
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SymbolPtr = dlsym(vdso, "__vdso_gettimeofday");
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if (SymbolPtr) {
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GetTimeOfDayPtr = reinterpret_cast<GetTimeOfDayType>(SymbolPtr);
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}
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SymbolPtr = dlsym(vdso, "__vdso_clock_gettime");
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if (SymbolPtr) {
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ClockGetTimePtr = reinterpret_cast<ClockGetTimeType>(SymbolPtr);
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}
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SymbolPtr = dlsym(vdso, "__vdso_clock_getres");
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if (SymbolPtr) {
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ClockGetResPtr = reinterpret_cast<ClockGetResType>(SymbolPtr);
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}
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SymbolPtr = dlsym(vdso, "__vdso_getcpu");
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if (SymbolPtr) {
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GetCPUPtr = reinterpret_cast<GetCPUType>(SymbolPtr);
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}
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dlclose(vdso);
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}
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static std::vector<FEXCore::IR::ThunkDefinition> VDSODefinitions = {
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{
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// sha256(libVDSO:time)
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{ 0x37, 0x63, 0x46, 0xb0, 0x79, 0x06, 0x5f, 0x9d, 0x00, 0xb6, 0x8d, 0xfd, 0x9e, 0x4a, 0x62, 0xcd, 0x1e, 0x6c, 0xcc, 0x22, 0xcd, 0xb2, 0xc0, 0x17, 0x7d, 0x42, 0x6a, 0x40, 0xd1, 0xeb, 0xfa, 0xe0 },
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nullptr,
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},
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{
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// sha256(libVDSO:gettimeofday)
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{ 0x77, 0x2a, 0xde, 0x1c, 0x13, 0x2d, 0xe9, 0x48, 0xaf, 0xe0, 0xba, 0xcc, 0x6a, 0x89, 0xff, 0xca, 0x4a, 0xdc, 0xd5, 0x63, 0x2c, 0xc5, 0x62, 0x8b, 0x5d, 0xde, 0x0b, 0x15, 0x35, 0xc6, 0xc7, 0x14 },
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nullptr,
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},
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{
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// sha256(libVDSO:clock_gettime)
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{ 0x3c, 0x96, 0x9b, 0x2d, 0xc3, 0xad, 0x2b, 0x3b, 0x9c, 0x4e, 0x4d, 0xca, 0x1c, 0xe8, 0x18, 0x4a, 0x12, 0x8a, 0xe4, 0xc1, 0x56, 0x92, 0x73, 0xce, 0x65, 0x85, 0x5f, 0x65, 0x7e, 0x94, 0x26, 0xbe },
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nullptr,
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},
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{
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// sha256(libVDSO:clock_gettime64)
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{ 0xba, 0xe9, 0x6d, 0x30, 0xc0, 0x68, 0xc6, 0xd7, 0x59, 0x04, 0xf7, 0x10, 0x06, 0x72, 0x88, 0xfd, 0x4c, 0x57, 0x0f, 0x31, 0xa5, 0xea, 0xa9, 0xb9, 0xd3, 0x8d, 0x03, 0x81, 0x50, 0x16, 0x22, 0x71 },
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nullptr,
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},
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{
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// sha256(libVDSO:clock_getres)
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{ 0xe4, 0xa1, 0xf6, 0x23, 0x35, 0xae, 0xb7, 0xb6, 0xb0, 0x37, 0xc5, 0xc3, 0xa3, 0xfd, 0xbf, 0xa2, 0xa1, 0xc8, 0x95, 0x78, 0xe5, 0x76, 0x86, 0xdb, 0x3e, 0x6c, 0x54, 0xd5, 0x02, 0x60, 0xd8, 0x6d },
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nullptr,
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},
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{
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// sha256(libVDSO:getcpu)
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{ 0x39, 0x83, 0x39, 0x36, 0x0f, 0x68, 0xd6, 0xfc, 0xc2, 0x3a, 0x97, 0x11, 0x85, 0x09, 0xc7, 0x25, 0xbb, 0x50, 0x49, 0x55, 0x6b, 0x0c, 0x9f, 0x50, 0x37, 0xf5, 0x9d, 0xb0, 0x38, 0x58, 0x57, 0x12 },
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nullptr,
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},
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};
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void* LoadVDSOThunks(bool Is64Bit, MapperFn Mapper) {
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void* VDSOBase{};
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FEX_CONFIG_OPT(ThunkGuestLibs, THUNKGUESTLIBS);
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FEX_CONFIG_OPT(ThunkGuestLibs32, THUNKGUESTLIBS32);
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std::filesystem::path ThunkGuestPath{};
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if (Is64Bit) {
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ThunkGuestPath = std::filesystem::path(ThunkGuestLibs()) / "libVDSO-guest.so";
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// Set the Thunk definition pointers for x86-64
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VDSODefinitions[0].ThunkFunction = &FEX::VDSO::time;
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VDSODefinitions[1].ThunkFunction = &FEX::VDSO::gettimeofday;
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VDSODefinitions[2].ThunkFunction = &FEX::VDSO::clock_gettime;
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VDSODefinitions[3].ThunkFunction = &FEX::VDSO::clock_gettime;
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VDSODefinitions[4].ThunkFunction = &FEX::VDSO::clock_getres;
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VDSODefinitions[5].ThunkFunction = &FEX::VDSO::getcpu;
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}
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else {
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ThunkGuestPath = std::filesystem::path(ThunkGuestLibs32()) / "libVDSO-guest.so";
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// Set the Thunk definition pointers for x86
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VDSODefinitions[0].ThunkFunction = &FEX::VDSO::x32::time;
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VDSODefinitions[1].ThunkFunction = &FEX::VDSO::x32::gettimeofday;
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VDSODefinitions[2].ThunkFunction = &FEX::VDSO::x32::clock_gettime;
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VDSODefinitions[3].ThunkFunction = &FEX::VDSO::x32::clock_gettime64;
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VDSODefinitions[4].ThunkFunction = &FEX::VDSO::x32::clock_getres;
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VDSODefinitions[5].ThunkFunction = &FEX::VDSO::x32::getcpu;
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}
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// Load VDSO if we can
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int VDSOFD = ::open(ThunkGuestPath.string().c_str(), O_RDONLY);
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if (VDSOFD != -1) {
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// Get file size
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size_t VDSOSize = lseek(VDSOFD, 0, SEEK_END);
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if (VDSOSize >= 4) {
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// Reset to beginning
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lseek(VDSOFD, 0, SEEK_SET);
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VDSOSize = FEXCore::AlignUp(VDSOSize, 4096);
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// Map the VDSO file to memory
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VDSOBase = Mapper(nullptr, VDSOSize, PROT_READ, MAP_PRIVATE, VDSOFD, 0);
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// Since we found our VDSO thunk library, find our host VDSO function implementations.
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LoadHostVDSO();
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}
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close(VDSOFD);
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}
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return VDSOBase;
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}
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std::vector<FEXCore::IR::ThunkDefinition> const& GetVDSOThunkDefinitions() {
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return VDSODefinitions;
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}
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}
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