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tests: split elf coverage into no-reloc control and reloc gate #70

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41 changes: 37 additions & 4 deletions tests/unit/elf.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,22 +2,55 @@

#include <tinykvm/machine.hpp>
#include <tinykvm/rsp_client.hpp>

#include <limits.h>
#include <stdexcept>
#include <unistd.h>

extern std::vector<uint8_t> load_file(const std::string& filename);
extern std::vector<uint8_t> build_and_load(const std::string& code);
static const uint64_t MAX_MEMORY = 8ul << 20; /* 8MB */
static const std::vector<std::string> env{
"LC_TYPE=C", "LC_ALL=C", "USER=root"};
static const std::vector<uint8_t> ld_linux_x86_64_so
= load_file("/lib64/ld-linux-x86-64.so.2");

static std::string current_dir_path()
{
char cwd[PATH_MAX];
if (getcwd(cwd, sizeof(cwd)) == nullptr) {
throw std::runtime_error("Failed to resolve current directory");
}
return std::string(cwd);
}

TEST_CASE("Initialize KVM", "[Initialize]")
{
tinykvm::Machine::init();
}

TEST_CASE("Verify dynamic Rust ELF", "[ELF]")
TEST_CASE("Verify static ELF without dynamic relocation", "[ELF][no-reloc]")
{
const auto binary = build_and_load(R"M(
#include <stdio.h>
int main(int argc, char** argv) {
(void)argc;
(void)argv;
return 123;
}
)M");

tinykvm::Machine machine{binary, {.max_mem = MAX_MEMORY}};
machine.setup_linux({"program"}, env);
machine.run(2.0f);

REQUIRE(machine.return_value() == 123);
}

TEST_CASE("Verify dynamic Rust ELF relocation support", "[ELF][reloc]")
{
std::string guest_filename
= std::string(get_current_dir_name()) + "/../unit/elf/rust.elf";
= current_dir_path() + "/../unit/elf/rust.elf";
// Make filename absolute
char abs_path[PATH_MAX];
realpath(guest_filename.c_str(), abs_path);
Expand Down Expand Up @@ -62,7 +95,7 @@ TEST_CASE("Verify dynamic Rust ELF", "[ELF]")
REQUIRE(machine.return_value() == 231);
}

TEST_CASE("Verify dynamic Rust ELF (himem)", "[ELF]")
TEST_CASE("Verify dynamic Rust ELF relocation support (himem)", "[ELF][reloc]")
{
const uint64_t HIMEM = 128ULL << 30; /* 128GB */
tinykvm::Machine machine{ld_linux_x86_64_so, {
Expand All @@ -83,7 +116,7 @@ TEST_CASE("Verify dynamic Rust ELF (himem)", "[ELF]")
// Load the dynamic linker instead of the program
std::vector<std::string> args;
args.push_back("/lib64/ld-linux-x86-64.so.2");
args.push_back(std::string(get_current_dir_name()) + "/../unit/elf/rust.elf");
args.push_back(current_dir_path() + "/../unit/elf/rust.elf");
// We need to create a Linux environment for runtimes to work well
machine.setup_linux(args, env);
REQUIRE(machine.entry_address() > HIMEM);
Expand Down
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