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#include "debug.h"
#include "gpgpu-sim/shader.h"
#include "gpgpu-sim/gpu-sim.h"
#include "cuda-sim/ptx_sim.h"
#include "cuda-sim/cuda-sim.h"
#include "cuda-sim/ptx_ir.h"
#include <map>
#include <stdio.h>
#include <string.h>
class watchpoint_event {
public:
watchpoint_event()
{
m_thread=NULL;
m_inst=NULL;
}
watchpoint_event(const ptx_thread_info *thd, const ptx_instruction *pI)
{
m_thread=thd;
m_inst = pI;
}
const ptx_thread_info *thread() const { return m_thread; }
const ptx_instruction *inst() const { return m_inst; }
private:
const ptx_thread_info *m_thread;
const ptx_instruction *m_inst;
};
std::map<unsigned,watchpoint_event> g_watchpoint_hits;
void hit_watchpoint( unsigned watchpoint_num, ptx_thread_info *thd, const ptx_instruction *pI )
{
g_watchpoint_hits[watchpoint_num]=watchpoint_event(thd,pI);
}
/// interactive debugger
void gpgpu_debug()
{
bool done=true;
static bool single_step=true;
static unsigned next_brkpt=1;
static std::map<unsigned,brk_pt> breakpoints;
/// if single stepping, go to interactive debugger
if( single_step )
done=false;
/// check if we've reached a breakpoint
for( std::map<unsigned,brk_pt>::iterator i=breakpoints.begin(); i!=breakpoints.end(); i++) {
unsigned num=i->first;
brk_pt &b=i->second;
if( b.is_watchpoint() ) {
unsigned addr = b.get_addr();
unsigned new_value = read_location(addr);
if( new_value != b.get_value() ) {
printf( "GPGPU-Sim DBG: watch point %u triggered (old value=%x, new value=%x)\n",
num,b.get_value(),new_value );
std::map<unsigned,watchpoint_event>::iterator w=g_watchpoint_hits.find(num);
if( w==g_watchpoint_hits.end() )
printf( "GPGPU-Sim DBG: memory transfer modified value\n");
else {
watchpoint_event wa = w->second;
const ptx_thread_info *thd = wa.thread();
const ptx_instruction *pI = wa.inst();
printf( "GPGPU-Sim DBG: modified by thread uid=%u, sid=%u, hwtid=%u\n",
thd->get_uid(),thd->get_hw_sid(), thd->get_hw_tid() );
printf( "GPGPU-Sim DBG: ");
pI->print_insn(stdout);
printf( "\n" );
g_watchpoint_hits.erase(w);
}
b.set_value(new_value);
done = false;
}
} else {
for( unsigned sid=0; sid < gpu_n_shader; sid++ ) {
inst_t *fvi = first_valid_thread(sc[sid]->pipeline_reg[IF_ID]);
if( !fvi ) continue;
if( thread_at_brkpt(fvi->ptx_thd_info, b) ) {
done = false;
printf("GPGPU-Sim DBG: reached breakpoint %u at %s (sm=%u, hwtid=%u)\n",
num, b.location().c_str(), sid, fvi->hw_thread_id );
}
}
}
}
if( done )
assert( g_watchpoint_hits.empty() );
/// enter interactive debugger loop
while (!done) {
printf("(gpgpu-sim dbg) ");
fflush(stdout);
char line[1024];
fgets(line,1024,stdin);
char *tok = strtok(line," \t\n");
if( !strcmp(tok,"dp") ) {
int shader_num = 0;
tok = strtok(NULL," \t\n");
sscanf(tok,"%d",&shader_num);
dump_pipeline_impl((0x40|0x4|0x1),shader_num,0);
printf("\n");
fflush(stdout);
} else if( !strcmp(tok,"q") || !strcmp(tok,"quit") ) {
printf("\nreally quit GPGPU-Sim (y/n)?\n");
fgets(line,1024,stdin);
tok = strtok(NULL," \t\n");
if( !strcmp(tok,"y") ) {
exit(0);
} else {
printf("not quiting.\n");
}
} else if( !strcmp(tok,"b") ) {
tok = strtok(NULL," \t\n");
char brkpt[1024];
sscanf(tok,"%s",brkpt);
tok = strtok(NULL," \t\n");
unsigned uid;
sscanf(tok,"%u",&uid);
breakpoints[next_brkpt++] = brk_pt(brkpt,uid);
} else if( !strcmp(tok,"d") ) {
tok = strtok(NULL," \t\n");
unsigned uid;
sscanf(tok,"%u",&uid);
breakpoints.erase(uid);
} else if( !strcmp(tok,"s") ) {
done = true;
} else if( !strcmp(tok,"c") ) {
single_step=false;
done = true;
} else if( !strcmp(tok,"w") ) {
tok = strtok(NULL," \t\n");
unsigned addr;
sscanf(tok,"%x",&addr);
unsigned value = read_location(addr);
g_global_mem->set_watch(addr,next_brkpt);
breakpoints[next_brkpt++] = brk_pt(addr,value);
} else if( !strcmp(tok,"h") ) {
printf("commands:\n");
printf(" q - quit GPGPU-Sim\n");
printf(" b <file>:<line> <thead uid> - set breakpoint\n");
printf(" w <global address> - set watchpoint\n");
printf(" del <n> - delete breakpoint\n");
printf(" s - single step one shader cycle (all cores)\n");
printf(" c - continue simulation without single stepping\n");
printf(" dp <n> - display pipeline contents on SM <n>\n");
printf(" h - print this message\n");
} else {
printf("\ncommand not understood.\n");
}
fflush(stdout);
}
}
bool thread_at_brkpt( void *thd, const struct brk_pt &b )
{
ptx_thread_info *thread = (ptx_thread_info *) thd;
return b.is_equal(thread->get_location(),thread->get_uid());
}
unsigned read_location( addr_t addr )
{
unsigned result=0;
g_global_mem->read(addr,4,&result);
return result;
}
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