Macintosh-Tools/dingusppc
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Improve the command line debugger.

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Add next command. Make the debugger somewhat foolproof.
This commit is contained in:
Maxim Poliakovski
2020-02-23 15:24:49 +01:00
parent 6428f324f6
commit 403c19ca39
4 changed files with 214 additions and 38 deletions
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107
debugger/debugger.cpp
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@@ -18,10 +18,24 @@
using namespace std;
void show_help()
static uint32_t str2addr(string& addr_str)
{
try {
return stoul(addr_str, NULL, 0);
}
catch (invalid_argument& exc) {
throw invalid_argument(string("Cannot convert ") + addr_str);
}
}
static void show_help()
{
cout << "Debugger commands:" << endl;
cout << " step -- execute single instruction" << endl;
cout << " si -- shortcut for step" << endl;
cout << " next -- same as step but treats subroutine calls" << endl;
cout << " as single instructions." << endl;
cout << " ni -- shortcut for next" << endl;
cout << " until X -- execute until address X is reached" << endl;
cout << " regs -- dump content of the GRPs" << endl;
cout << " set R=X -- assign value X to register R" << endl;
@@ -30,33 +44,24 @@ void show_help()
cout << " profiler -- show stats related to the processor" << endl;
#endif
cout << " disas N,X -- disassemble N instructions starting at address X" << endl;
cout << " X can be any number or a known register name" << endl;
cout << " disas with no arguments defaults to disas 1,pc" << endl;
cout << " quit -- quit the debugger" << endl << endl;
cout << "Pressing ENTER will repeat last command." << endl;
}
void dump_regs()
{
for (uint32_t i = 0; i < 32; i++)
cout << "GPR " << dec << i << " : " << hex << ppc_state.ppc_gpr[i] << endl;
cout << "PC: " << hex << ppc_state.ppc_pc << endl;
cout << "LR: " << hex << ppc_state.ppc_spr[8] << endl;
cout << "CR: " << hex << ppc_state.ppc_cr << endl;
cout << "CTR: " << hex << ppc_state.ppc_spr[9] << endl;
cout << "XER: " << hex << ppc_state.ppc_spr[1] << endl;
cout << "MSR: " << hex << ppc_state.ppc_msr << endl;
}
void disasm(uint32_t inst_num = 1UL, uint32_t address = ppc_state.ppc_pc)
static void disasm(uint32_t inst_num = 1UL, uint32_t address = ppc_state.ppc_pc)
{
PPCDisasmContext ctx;
quickinstruction_translate(ppc_state.ppc_pc);
ctx.instr_addr = ppc_state.ppc_pc;
ctx.instr_code = ppc_cur_instruction;
ctx.instr_addr = address;
ctx.simplified = true;
cout << hex << ppc_state.ppc_pc << " " << disassemble_single(&ctx) << endl;
for (int i = 0; i < inst_num; i++) {
ctx.instr_code = mem_grab_dword(ctx.instr_addr);
cout << uppercase << hex << ctx.instr_addr << " "
<< disassemble_single(&ctx) << endl;
}
}
void enter_debugger()
@@ -65,7 +70,7 @@ void enter_debugger()
uint32_t addr, inst_grab;
std::stringstream ss;
cout << "Welcome to the PowerPC debugger." << endl;
cout << "Welcome to the DingusPPC command line debugger." << endl;
cout << "Please enter a command or 'help'." << endl << endl;
while (1) {
@@ -98,38 +103,64 @@ void enter_debugger()
}
#endif
else if (cmd == "regs") {
dump_regs();
print_gprs();
}
else if (cmd == "set") {
ss >> expr_str;
reg_expr = expr_str.substr(0, expr_str.find("="));
if (reg_expr == "pc") {
try {
reg_expr = expr_str.substr(0, expr_str.find("="));
addr_str = expr_str.substr(expr_str.find("=") + 1);
addr = stol(addr_str, NULL, 0);
ppc_state.ppc_pc = addr;
addr = str2addr(addr_str);
set_reg(reg_expr, addr);
}
else {
cout << "Unknown register " << reg_expr << endl;
catch (invalid_argument& exc) {
cout << exc.what() << endl;
}
}
else if (cmd == "step") {
else if (cmd == "step" || cmd == "si") {
ppc_exec_single();
}
else if (cmd == "next" || cmd == "ni") {
addr_str = "PC";
addr = get_reg(addr_str) + 4;
ppc_exec_until(addr);
}
else if (cmd == "until") {
ss >> addr_str;
addr = stol(addr_str, NULL, 16);
ppc_exec_until(addr);
try {
addr = str2addr(addr_str);
ppc_exec_until(addr);
}
catch (invalid_argument& exc) {
cout << exc.what() << endl;
}
}
else if (cmd == "disas") {
expr_str = "";
ss >> expr_str;
if (expr_str.length() > 0) {
cout << "Parsing disas params." << endl;
inst_num_str = expr_str.substr(expr_str.find(" ") + 1, expr_str.find(","));
inst_grab = stoul(inst_num_str, NULL, 0);
addr_str = expr_str.substr(expr_str.find(",") + 1, expr_str.length() - 1);
addr = stoul(addr_str, NULL, 16);
disasm(inst_grab, addr);
inst_num_str = expr_str.substr(0, expr_str.find(","));
inst_grab = stol(inst_num_str, NULL, 0);
addr_str = expr_str.substr(expr_str.find(",") + 1);
try {
addr = str2addr(addr_str);
}
catch (invalid_argument& exc) {
try {
/* number conversion failed, trying reg name */
addr = get_reg(addr_str);
}
catch (invalid_argument& exc) {
cout << exc.what() << endl;
continue;
}
}
try {
disasm(inst_grab, addr);
}
catch (invalid_argument& exc) {
cout << exc.what() << endl;
}
}
else {
disasm();
@@ -141,4 +172,4 @@ void enter_debugger()
}
last_cmd = cmd;
}
}
}