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Set wasm32 target triple and data layout for the generated LLVM IR. #56

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Sep 19, 2024
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Set wasm32 target triple and data layout for the generated LLVM IR. #56

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14 changes: 14 additions & 0 deletions lifter/Lift.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ DEFINE_string(arch, REMILL_ARCH,
DEFINE_string(target_elf, "DUMMY_ELF", "Name of the target ELF binary");
DEFINE_string(dbg_fun_cfg, "", "Function Name of the debug target");
DEFINE_string(bitcode_path, "", "Function Name of the debug target");
DEFINE_string(target_arch, "", "Target Architecture for conversion");

extern "C" void debug_stream_out_sigaction(int sig, siginfo_t *info, void *ctx) {
std::cout << remill::ECV_DEBUG_STREAM.str();
Expand Down Expand Up @@ -148,6 +149,19 @@ int main(int argc, char *argv[]) {
/* generate LLVM bitcode file */
auto host_arch = remill::Arch::Build(&context, os_name, remill::GetArchName(REMILL_ARCH));
host_arch->PrepareModule(module.get());

// Set wasm32-unknown-wasi and wasm32 data layout if necessary.
if (FLAGS_target_arch == "wasm32") {
auto wasm32_dl =
llvm::DataLayout("e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128-ni:1:10:20");
module->setDataLayout(wasm32_dl.getStringRepresentation());
llvm::Triple wasm32_triple;
wasm32_triple.setArch(llvm::Triple::wasm32);
wasm32_triple.setVendor(llvm::Triple::UnknownVendor);
wasm32_triple.setOS(llvm::Triple::WASI);
module->setTargetTriple(wasm32_triple.str());
}

remill::StoreModuleToFile(module.get(), FLAGS_bc_out);

printf("[\033[32mINFO\033[0m] Lift Done.\n");
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9 changes: 8 additions & 1 deletion scripts/dev.sh
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Expand Up @@ -58,13 +58,20 @@ lifting() {
# ELF -> LLVM bc
echo -e "[\033[32mINFO\033[0m] ELF Converting Start."
elf_path=$( realpath "$1" )

wasm32_target_arch=''
if [ "${TARGET}" == "wasi" ]; then
wasm32_target_arch='wasm32'
fi

cd ${BUILD_LIFTER_DIR} && \
./elflift \
--arch aarch64 \
--bc_out ./lift.bc \
--target_elf "$elf_path" \
--dbg_fun_cfg "$2" \
--bitcode_path "$3" && \
--bitcode_path "$3" \
--target_arch "$wasm32_target_arch" && \
llvm-dis-${LLVM_VERSION} lift.bc -o lift.ll
echo -e "[\033[32mINFO\033[0m] Generate lift.bc."

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