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glift: Initial implementation of the -sketchify option.

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This commit is contained in:
Alberto Gonzalez 2020-04-22 06:16:12 +00:00
parent 09848b3b9f
commit 19dafcd4f1
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GPG key ID: 8395A8BA109708B2
1 changed files with 70 additions and 49 deletions
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119
passes/cmds/glift.cc
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@ -27,7 +27,7 @@ PRIVATE_NAMESPACE_BEGIN
struct GliftPass : public Pass {
private:
bool opt_create, opt_taintconstants;
bool opt_create, opt_sketchify, opt_taintconstants;
std::vector<std::string> args;
std::vector<std::string>::size_type argidx;
RTLIL::Module *module;
@ -38,12 +38,18 @@ struct GliftPass : public Pass {
opt_create = true;
continue;
}
if (args[argidx] == "-sketchify") {
opt_sketchify = true;
continue;
}
if (args[argidx] == "-taint-constants") {
opt_taintconstants = true;
continue;
}
break;
}
if(!opt_create && !opt_sketchify) log_cmd_error("One of `-create` or `-sketchify` must be specified.\n");
if(opt_create && opt_sketchify) log_cmd_error("Only one of `-create` or `-sketchify` may be specified.\n");
}
RTLIL::SigSpec get_corresponding_taint_signal(RTLIL::SigSpec sig) {
@ -75,7 +81,37 @@ struct GliftPass : public Pass {
return ret;
}
void create_precise_glift_logic() {
void add_precise_GLIFT_logic(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH2 or OR2_SH2
RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_1_1", port_a, false, cell->get_src_attribute());
RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_1_2", port_b, false, cell->get_src_attribute());
auto subexpr1 = module->And(cell->name.str() + "_t_1_3", (cell->type == "$_AND_")? port_a : n_port_a, port_b_taint, false, cell->get_src_attribute());
auto subexpr2 = module->And(cell->name.str() + "_t_1_4", (cell->type == "$_AND_")? port_b : n_port_b, port_a_taint, false, cell->get_src_attribute());
auto subexpr3 = module->And(cell->name.str() + "_t_1_5", port_a_taint, port_b_taint, false, cell->get_src_attribute());
auto subexpr4 = module->Or(cell->name.str() + "_t_1_6", subexpr1, subexpr2, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_1_7", subexpr4, subexpr3, port_y_taint, false, cell->get_src_attribute());
}
void add_imprecise_GLIFT_logic_1(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH3 or OR2_SH3
RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_2_1", port_a, false, cell->get_src_attribute());
auto subexpr1 = module->And(cell->name.str() + "_t_2_2", (cell->type == "$_AND_")? port_b : n_port_a, (cell->type == "$_AND_")? port_a_taint : port_b_taint, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_2_3", (cell->type == "$_AND_")? port_b_taint : port_a_taint, subexpr1, port_y_taint, false, cell->get_src_attribute());
}
void add_imprecise_GLIFT_logic_2(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH4 or OR2_SH4
RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_3_1", port_b, false, cell->get_src_attribute());
auto subexpr1 = module->And(cell->name.str() + "_t_3_2", (cell->type == "$_AND_")? port_a : n_port_b, (cell->type == "$_AND_")? port_b_taint : port_a_taint, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_3_3", (cell->type == "$_AND_")? port_a_taint : port_b_taint, subexpr1, port_y_taint, false, cell->get_src_attribute());
}
void add_imprecise_GLIFT_logic_3(const RTLIL::Cell *cell, RTLIL::SigSpec &port_a_taint, RTLIL::SigSpec &port_b_taint, RTLIL::SigSpec &port_y_taint) {
//AKA AN2_SH5 or OR2_SH5
module->addOr(cell->name.str() + "_t_4_1", port_a_taint, port_b_taint, port_y_taint, false, cell->get_src_attribute());
}
void create_glift_logic() {
std::vector<RTLIL::SigSig> connections(module->connections());
std::vector<RTLIL::SigSig> new_connections;
@ -94,41 +130,27 @@ struct GliftPass : public Pass {
for (unsigned int i = 0; i < NUM_PORTS; ++i)
port_taints[i] = get_corresponding_taint_signal(ports[i]);
if (cell->type == "$_AND_") {
//We are basically trying to replace each AND cell with an AN2_SH2 cell:
//module AN2_SH2(A, A_t, B, B_t, Y, Y_t);
// input A, A_t, B, B_t;
// output Y, Y_t;
//
// assign Y = A & B;
// assign Y_t = A & B_t | B & A_t | A_t & B_t;
//endmodule
auto subexpr1 = module->And(cell->name.str() + "_t_1", ports[A], port_taints[B], false, cell->get_src_attribute());
auto subexpr2 = module->And(cell->name.str() + "_t_2", ports[B], port_taints[A], false, cell->get_src_attribute());
auto subexpr3 = module->And(cell->name.str() + "_t_3", port_taints[A], port_taints[B], false, cell->get_src_attribute());
auto subexpr4 = module->Or(cell->name.str() + "_t_4", subexpr1, subexpr2, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_5", subexpr4, subexpr3, port_taints[Y], false, cell->get_src_attribute());
}
if (opt_create)
add_precise_GLIFT_logic(cell, ports[A], port_taints[A], ports[B], port_taints[B], port_taints[Y]);
else if (opt_sketchify) {
RTLIL::SigSpec precise_y(module->addWire(cell->name.str() + "_y1", 1)),
imprecise_1_y(module->addWire(cell->name.str() + "_y2", 1)),
imprecise_2_y(module->addWire(cell->name.str() + "_y3", 1)),
imprecise_3_y(module->addWire(cell->name.str() + "_y4", 1));
else if (cell->type == "$_OR_") {
//We are basically trying to replace each OR cell with an OR2_SH2 cell:
//module OR2_SH2(A, A_t, B, B_t, Y, Y_t);
// input A, A_t, B, B_t;
// output Y, Y_t;
//
// assign Y = A | B;
// assign Y_t = ~A & B_t | ~B & A_t | A_t & B_t;
//endmodule
RTLIL::SigSpec n_port_a = module->LogicNot(cell->name.str() + "_t_1", ports[A], false, cell->get_src_attribute());
RTLIL::SigSpec n_port_b = module->LogicNot(cell->name.str() + "_t_2", ports[B], false, cell->get_src_attribute());
auto subexpr1 = module->And(cell->name.str() + "_t_3", n_port_a, port_taints[B], false, cell->get_src_attribute());
auto subexpr2 = module->And(cell->name.str() + "_t_4", n_port_b, port_taints[A], false, cell->get_src_attribute());
auto subexpr3 = module->And(cell->name.str() + "_t_5", port_taints[A], port_taints[B], false, cell->get_src_attribute());
auto subexpr4 = module->Or(cell->name.str() + "_t_6", subexpr1, subexpr2, false, cell->get_src_attribute());
module->addOr(cell->name.str() + "_t_7", subexpr4, subexpr3, port_taints[Y], false, cell->get_src_attribute());
}
add_precise_GLIFT_logic(cell, ports[A], port_taints[A], ports[B], port_taints[B], precise_y);
add_imprecise_GLIFT_logic_1(cell, ports[A], port_taints[A], ports[B], port_taints[B], imprecise_1_y);
add_imprecise_GLIFT_logic_2(cell, ports[A], port_taints[A], ports[B], port_taints[B], imprecise_2_y);
add_imprecise_GLIFT_logic_3(cell, port_taints[A], port_taints[B], imprecise_3_y);
else log_cmd_error("This is a bug (1).\n");
RTLIL::SigSpec meta_mux_select(module->addWire(cell->name.str() + "_sel", 2));
meta_mux_select.as_wire()->set_bool_attribute("\\maximize");
new_connections.emplace_back(meta_mux_select, module->Anyconst(cell->name.str() + "_hole", 2, cell->get_src_attribute()));
RTLIL::SigSpec meta_mux1(module->Mux(cell->name.str() + "_mux1", precise_y, imprecise_1_y, meta_mux_select[1]));
RTLIL::SigSpec meta_mux2(module->Mux(cell->name.str() + "_mux2", imprecise_2_y, imprecise_3_y, meta_mux_select[1]));
module->addMux(cell->name.str() + "_mux3", meta_mux1, meta_mux2, meta_mux_select[0], port_taints[Y]);
}
else log_cmd_error("This is a bug (2).\n");
}
else if (cell->type.in("$_NOT_")) {
const unsigned int A = 0, Y = 1;
@ -142,17 +164,9 @@ struct GliftPass : public Pass {
port_taints[i] = get_corresponding_taint_signal(ports[i]);
if (cell->type == "$_NOT_") {
//We are basically trying to replace each NOT cell with an IV_SH2 cell:
//module IV_SH2(A, A_t, Y, Y_t);
// input A, A_t;
// output Y, Y_t;
//
// assign Y = ~A;
// assign Y_t = A_t;
//endmodule
new_connections.emplace_back(port_taints[Y], port_taints[A]);
}
else log_cmd_error("This is a bug (1).\n");
else log_cmd_error("This is a bug (3).\n");
}
} //end foreach cell in cells
@ -176,22 +190,30 @@ struct GliftPass : public Pass {
public:
GliftPass() : Pass("glift", "create and transform GLIFT models"), opt_create(false), opt_taintconstants(false), module(nullptr) { }
GliftPass() : Pass("glift", "create and transform GLIFT models"), opt_create(false), opt_sketchify(false), opt_taintconstants(false), module(nullptr) { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" glift [options] [selection]\n");
log(" glift -create|-sketchify [options] [selection]\n");
log("\n");
log("Adds, removes, or manipulates gate-level information flow tracking (GLIFT) logic\n");
log("to the current or specified module.\n");
log("\n");
log("Options:");
log("Commands:");
log("\n");
log(" -create");
log(" Replaces the current or specified module with one that has additional \"taint\"\n");
log(" inputs, outputs, and internal nets along with precise taint-tracking logic.\n");
log("\n");
log(" -sketchify");
log(" Replaces the current or specified module with one that has additional \"taint\"\n");
log(" inputs, outputs, and internal nets along with varying-precision taint-tracking logic.\n");
log(" Which version of taint tracking logic is used at a given cell is determined by a MUX\n");
log(" selected by an $anyconst cell.\n");
log("\n");
log("Options:");
log("\n");
log(" -taint-constants");
log(" Constant values in the design are labeled as tainted.\n");
log(" (default: label constants as un-tainted)\n");
@ -213,8 +235,7 @@ struct GliftPass : public Pass {
if (module == nullptr)
log_cmd_error("Can't operate on an empty selection!\n");
if (opt_create)
create_precise_glift_logic();
create_glift_logic();
}
} GliftPass;