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SIGINT handler, continue

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This commit is contained in:
Kelvin Sherlock 2013-07-04 12:52:35 -04:00
parent 27cd692790
commit 4bdac5a62a
1 changed files with 135 additions and 69 deletions
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204
bin/debugger.cpp
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@ -4,6 +4,8 @@
#include <cstring>
#include <cstdlib>
#include <signal.h>
#include <string>
#include <vector>
#include <array>
@ -29,6 +31,49 @@ bool ParseLine(const char *iter, Command *command);
extern "C" {
uint32_t debuggerReadLong(uint32_t address)
{
uint32_t tmp = 0;
for (unsigned i = 0; i < 4; ++i)
{
if (address < Flags.memorySize)
tmp = (tmp << 8) + Flags.memory[address++];
}
return tmp;
}
uint16_t debuggerReadWord(uint32_t address)
{
uint16_t tmp = 0;
for (unsigned i = 0; i < 2; ++i)
{
if (address < Flags.memorySize)
tmp = (tmp << 8) + Flags.memory[address++];
}
return tmp;
}
uint8_t debuggerReadByte(uint32_t address)
{
if (address < Flags.memorySize)
return Flags.memory[address];
return 0;
}
}
namespace {
bool sigInt = false;
void sigIntHandler(int)
{
sigInt = true;
}
// any reason to have enable/disable flag
// vs deleting it?
std::unordered_map<uint16_t, bool> tbrkMap;
@ -109,41 +154,6 @@ extern "C" {
return brkMap.find(address) != brkMap.end();
}
uint32_t debuggerReadLong(uint32_t address)
{
uint32_t tmp = 0;
for (unsigned i = 0; i < 4; ++i)
{
if (address < Flags.memorySize)
tmp = (tmp << 8) + Flags.memory[address++];
}
return tmp;
}
uint16_t debuggerReadWord(uint32_t address)
{
uint16_t tmp = 0;
for (unsigned i = 0; i < 2; ++i)
{
if (address < Flags.memorySize)
tmp = (tmp << 8) + Flags.memory[address++];
}
return tmp;
}
uint8_t debuggerReadByte(uint32_t address)
{
if (address < Flags.memorySize)
return Flags.memory[address];
return 0;
}
}
namespace {
void hexdump(const uint8_t *data, ssize_t size, uint32_t address = 0)
{
@ -231,6 +241,82 @@ namespace {
return pc;
}
bool step(bool trace)
{
// return false to break (toolbreak, address break, etc.)
uint16_t op;
cpuExecuteInstruction();
uint32_t pc = cpuGetPC();
if (trace) disasm(pc, &op);
else op = debuggerReadWord(pc);
// will this also be set by an interrupt?
if (cpuGetStop())
{
if (!trace) disasm(pc);
printf("CPU stopped\n");
return false;
}
if (sigInt)
{
if (!trace) disasm(pc);
printf("^C break\n");
sigInt = false;
return false;
}
// check for pc breaks
if (brkLookup(pc))
{
if (!trace) disasm(pc);
printf("Address break: $%08x\n", pc);
return false;
}
// todo -- instruction break for rts /rtn
// check for toolbreaks.
if ((op & 0xf000) == 0xa000)
{
if (tbrkLookup(op))
{
if (!trace) disasm(pc);
printf("Tool break: $%04x\n", op);
return false;
}
}
if (pc > Flags.memorySize)
{
printf("PC out of range\n");
return false;
}
uint32_t sp = cpuGetAReg(7);
if (sp < Flags.stackRange.first)
{
printf("Stack overflow error\n");
return false;
}
if (sp > Flags.stackRange.second)
{
printf("Stack underflow error\n");
return false;
}
return true;
}
}
@ -402,6 +488,7 @@ void DebugBreak(Command &cmd)
}
void DebugStep(const Command &cmd)
{
// TODO - step n to step specified # of instructions.
@ -416,43 +503,16 @@ void DebugStep(const Command &cmd)
// TODO -- move to common function...
for (int i = 0; i < count; ++i)
{
uint16_t op;
cpuExecuteInstruction();
if (cpuGetStop()) break; // will this also be set by an interrupt?
uint32_t pc = cpuGetPC();
disasm(pc, &op);
// check for pc breaks
if (brkLookup(pc))
{
break;
}
// check for toolbreaks.
if ((op & 0xf000) == 0xa000)
{
if (tbrkLookup(op))
break;
}
uint32_t sp = cpuGetAReg(7);
if (sp < Flags.stackRange.first)
{
fprintf(stderr, "Stack overflow error\n");
break;
}
if (sp > Flags.stackRange.second)
{
fprintf(stderr, "Stack underflow error\n");
break;
}
if (!step(true)) break;
}
}
void DebugContinue(const Command &cmd)
{
while (step(false)) ;
}
void DebugSetARegister(Command &cmd)
{
if (cmd.argc != 2) return;
@ -529,6 +589,8 @@ void DebugShell()
printf("MPW Debugger shell\n\n");
disasm(cpuGetPC());
signal(SIGINT, sigIntHandler);
for(;;)
{
cp = readline("] ");
@ -569,6 +631,10 @@ void DebugShell()
DebugStep(cmd);
break;
case Continue:
DebugContinue(cmd);
break;
case TBreak:
DebugToolBreak(cmd);
break;