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tests/fuzz_thumb: Fuzz instructions that may change the PC

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This commit is contained in:
MerryMage 2016-07-12 10:58:57 +01:00
parent 09420d190b
commit 60455f9bbc
1 changed files with 36 additions and 0 deletions
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36
tests/arm/fuzz_thumb.cpp
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@ -9,6 +9,7 @@
#include <catch.hpp>
#include <common/bit_util.h>
#include <common/bit_set.h>
#include "common/common_types.h"
#include "frontend/disassembler.h"
@ -87,6 +88,9 @@ static void InterpreterFallback(u32 pc, Dynarmic::Jit* jit) {
InterpreterClearCache();
InterpreterMainLoop(&interp_state);
bool T = Dynarmic::Common::Bit<5>(interp_state.Cpsr);
interp_state.Reg[15] &= T ? 0xFFFFFFFE : 0xFFFFFFFC;
jit->Regs() = interp_state.Reg;
jit->Cpsr() = interp_state.Cpsr;
}
@ -188,6 +192,10 @@ void FuzzJitThumb(const size_t instruction_count, const size_t instructions_to_e
interp.NumInstrsToExecute = instructions_to_execute_count;
InterpreterMainLoop(&interp);
auto interp_write_records = write_records;
{
bool T = Dynarmic::Common::Bit<5>(interp.Cpsr);
interp.Reg[15] &= T ? 0xFFFFFFFE : 0xFFFFFFFC;
}
// Run jit
write_records.clear();
@ -272,3 +280,31 @@ TEST_CASE("Fuzz Thumb instructions set 1", "[JitX64][Thumb]") {
FuzzJitThumb(1024, 1025, 25, instruction_select);
}
}
TEST_CASE("Fuzz Thumb instructions set 2 (affects PC)", "[JitX64][Thumb]") {
const std::array<InstructionGenerator, 7> instructions = {{
InstructionGenerator("01000111xmmmm000", // BLX/BX
[](u16 inst){
u32 Rm = Dynarmic::Common::Bits<3, 6>(inst);
return Rm != 15;
}),
InstructionGenerator("1010oxxxxxxxxxxx"), // add to pc/sp
InstructionGenerator("11100xxxxxxxxxxx"), // B
InstructionGenerator("01000100h0xxxxxx"), // ADD (high registers)
InstructionGenerator("01000110h0xxxxxx"), // MOV (high registers)
InstructionGenerator("1101ccccxxxxxxxx", // B<cond>
[](u16 inst){
u32 c = Dynarmic::Common::Bits<9, 12>(inst);
return c < 0b1110; // Don't want SWI or undefined instructions.
}),
InstructionGenerator("10110110011x0xxx"), // CPS
}};
auto instruction_select = [&]() -> u16 {
size_t inst_index = RandInt<size_t>(0, instructions.size() - 1);
return instructions[inst_index].Generate();
};
FuzzJitThumb(1, 1, 10000, instruction_select);
}