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examples.cpp
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examples.cpp
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#include <catch2/catch_test_macros.hpp>
#include <catch2/matchers/catch_matchers_string.hpp>
#include <libriscv/machine.hpp>
extern std::vector<uint8_t> build_and_load(const std::string& code,
const std::string& args = "-O2 -static", bool cpp = false);
using namespace riscv;
TEST_CASE("Main example", "[Examples]")
{
const auto binary = build_and_load(R"M(
extern void exit(int);
int main() {
exit(666);
return 123;
})M");
Machine<RISCV64> machine { binary };
machine.setup_linux(
{"myprogram", "1st argument!", "2nd argument!"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
machine.setup_linux_syscalls();
struct State {
long code = -1;
} state;
machine.set_userdata(&state);
// exit and exit_group
Machine<RISCV64>::install_syscall_handler(94,
[] (Machine<RISCV64>& machine) {
const auto [code] = machine.sysargs <int> ();
auto& state = *machine.get_userdata<State> ();
state.code = code;
machine.stop();
});
// Newlib uses regular exit syscall (93)
Machine<RISCV64>::install_syscall_handler(93,
Machine<RISCV64>::syscall_handlers.at(94));
machine.simulate(5'000'000UL);
REQUIRE(state.code == 666);
REQUIRE(machine.return_value() == 666);
}
#include <libriscv/rv32i_instr.hpp>
TEST_CASE("One instruction at a time", "[Examples]")
{
const auto binary = build_and_load(R"M(
extern void exit(int);
int main() {
return 0x1234;
})M");
Machine<RISCV64> machine{binary};
machine.setup_linux(
{"myprogram"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
machine.setup_linux_syscalls();
machine.set_max_instructions(1'000'000UL);
while (!machine.stopped()) {
auto& cpu = machine.cpu;
// Read next instruction
auto instruction = cpu.read_next_instruction();
// Print the instruction to terminal
printf("%s\n",
cpu.to_string(instruction, cpu.decode(instruction)).c_str());
// Execute instruction directly
cpu.execute(instruction);
// Increment PC to next instruction, and increment instruction counter
cpu.increment_pc(instruction.length());
machine.increment_counter(1);
}
REQUIRE(machine.return_value() == 0x1234);
}
TEST_CASE("One instruction at a time with ilimit", "[Examples]")
{
const auto binary = build_and_load(R"M(
int main() {
return 0x1234;
})M");
Machine<RISCV64> machine{binary};
machine.setup_linux(
{"myprogram"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
machine.setup_linux_syscalls();
do {
// Only execute 1000 instructions at a time
machine.reset_instruction_counter();
machine.set_max_instructions(1'000);
while (!machine.stopped())
{
auto& cpu = machine.cpu;
// Read next instruction
const auto instruction = cpu.read_next_instruction();
// Print the instruction to terminal
printf("%s\n", cpu.to_string(instruction).c_str());
// Execute instruction directly
cpu.execute(instruction);
// Increment PC to next instruction, and increment instruction counter
cpu.increment_pc(instruction.length());
machine.increment_counter(1);
}
} while (machine.instruction_limit_reached());
REQUIRE(machine.return_value() == 0x1234);
}
TEST_CASE("Build machine from empty", "[Examples]")
{
Machine<RISCV32> machine;
machine.setup_minimal_syscalls();
std::vector<uint32_t> my_program {
0x29a00513, // li a0,666
0x05d00893, // li a7,93
0x00000073, // ecall
};
// Set main execute segment (12 instruction bytes)
const uint32_t dst = 0x1000;
machine.cpu.init_execute_area(my_program.data(), dst, 12);
// Jump to the start instruction
machine.cpu.jump(dst);
// Geronimo!
machine.simulate(1'000ul);
REQUIRE(machine.return_value() == 666);
}
TEST_CASE("Execute while doing other things", "[Examples]")
{
const auto binary = build_and_load(R"M(
long test() {
for (volatile unsigned i = 0; i < 10000; i++);
return 0x5678;
}
int main() {
return 0x1234;
})M");
Machine<RISCV64> machine{binary};
machine.setup_linux(
{"myprogram"},
{"LC_TYPE=C", "LC_ALL=C", "USER=root"});
machine.setup_linux_syscalls();
machine.simulate();
REQUIRE(machine.return_value() == 0x1234);
auto test_addr = machine.address_of("test");
// Reset the stack pointer from any previous call to its initial value
machine.cpu.reset_stack_pointer();
// Function call setup for the guest VM, but don't start execution
machine.setup_call(555, 666);
machine.cpu.jump(test_addr);
// Run the program for X amount of instructions, then print something, then
// resume execution again. Do this until stopped.
do {
// Execute 1000 instructions at a time
machine.simulate<false>(1000);
// Do some work in between simulation
printf("Working ...\n");
} while (machine.instruction_limit_reached());
REQUIRE(machine.return_value() == 0x5678);
}