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https://github.com/FEX-Emu/FEX.git
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Ryan Houdek
5bce7e0616
Applications can use this to ensure they've grabbed the whole XSTATE correctly. UML uses it to determine if the FPState was correctly saved. Also adds a unittest to ensure the same correct behaviour. For #5206
72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
#include "fpstate.h"
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#include <catch2/catch_test_macros.hpp>
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#include <array>
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#include <signal.h>
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#include <sys/mman.h>
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#include <stdint.h>
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#include <cstdlib>
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#include <optional>
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#pragma GCC diagnostic ignored "-Wattributes" // Suppress warning in case control-flow checks aren't enabled
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__attribute__((naked, nocf_check)) static void InvalidINT() {
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__asm volatile(R"(
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hlt;
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ret;
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)");
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}
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__attribute__((naked, nocf_check)) static void SafeRet() {
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__asm volatile(R"(
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ret;
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)");
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}
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struct capture_data {
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uint32_t magic1;
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uint32_t magic2;
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};
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std::optional<capture_data> data;
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static void signal_check(int signal, siginfo_t* siginfo, void* context) {
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ucontext_t* _context = (ucontext_t*)context;
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auto mcontext = &_context->uc_mcontext;
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#ifdef REG_RIP
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#define FEX_IP_REG REG_RIP
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#else
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#define FEX_IP_REG REG_EIP
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#endif
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auto xstate = reinterpret_cast<FEX::Unittests::xstate*>(_context->uc_mcontext.fpregs);
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auto magic1 = xstate->fpstate.sw_reserved.magic1;
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uint32_t magic2 {};
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if (magic1 == FEX::Unittests::fpx_sw_bytes::FP_XSTATE_MAGIC_1) {
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auto magic2_addr =
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reinterpret_cast<uint32_t*>(reinterpret_cast<uintptr_t>(xstate) + xstate->fpstate.sw_reserved.extended_size - sizeof(uint32_t));
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magic2 = *magic2_addr;
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}
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data.emplace(capture_data {
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.magic1 = magic1,
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.magic2 = magic2,
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});
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// Change RIP to a safe return so we can continue testing.
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mcontext->gregs[FEX_IP_REG] = reinterpret_cast<greg_t>(&SafeRet);
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}
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TEST_CASE("Signals: SIGILL flags") {
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struct sigaction act {};
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act.sa_sigaction = signal_check;
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act.sa_flags = SA_SIGINFO;
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sigaction(SIGSEGV, &act, nullptr);
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sigaction(SIGTRAP, &act, nullptr);
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sigaction(SIGILL, &act, nullptr);
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InvalidINT();
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REQUIRE(data.has_value());
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CHECK(data->magic1 == FEX::Unittests::fpx_sw_bytes::FP_XSTATE_MAGIC_1);
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CHECK(data->magic2 == FEX::Unittests::fpx_sw_bytes::FP_XSTATE_MAGIC_2);
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}
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