//--------------------------------------------------------------------------
// returns true-lowcnd was false, resumed the application
// nb: recursive calls to this function are not handled in any special way!
bool debmod_t::handle_lowcnd(lowcnd_t *lc, debug_event_t *event, int elc_flags)
{
if ( (debugger_flags & DBG_FLAG_CAN_CONT_BPT) == 0 )
{
// difficult case: we have to reset pc, remove the bpt, single step, and resume the app
QASSERT(616, !handling_lowcnds.has(lc->ea));
handling_lowcnds.push_back(lc->ea);
int code;
if ( (elc_flags & ELC_KEEP_EIP) == 0 )
{
regval_t rv;
rv._set_int(lc->ea);
code = dbg_write_register(event->tid, pc_idx, &rv);
if ( code <= 0 )
{
handling_lowcnds.del(lc->ea);
return false;
}
}
code = dbg_freeze_threads_except(event->tid);
if ( code > 0 )
{
int bptlen = lc->type == BPT_SOFT ? lc->orgbytes.size() : lc->size;
code = dbg_del_bpt(lc->type, lc->ea, lc->orgbytes.begin(), bptlen);
if ( code > 0 )
{
code = dbg_perform_single_step(event, lc->cmd);
if ( code <= 0 )
dmsg("%a: failed to single step\n", event->ea); // may happen
if ( dbg_add_bpt(lc->type, lc->ea, bptlen) <= 0 )
{
// if this fails, it may be because the breakpoint is invalid
// at this time so we should notify IDA it isn't available
// any more
code = 0;
dwarning("%a: could not restore deleted bpt\n", lc->ea); // odd
}
}
if ( dbg_thaw_threads_except(event->tid) <= 0 )
{
dwarning("%d: could not resume suspended threads\n", event->tid); // odd
code = 0;
}
}
handling_lowcnds.del(lc->ea);
if ( code <= 0 || event->eid != STEP )
return false; // did not resume
}
if ( (elc_flags & ELC_KEEP_SUSP) != 0 )
return true;
return dbg_continue_after_event(event) > 0;
}
//--------------------------------------------------------------------------
// returns true-lowcnd was false, resumed the application
// nb: recursive calls to this function are not handled in any special way!
bool debmod_t::handle_lowcnd(lowcnd_t *lc, debug_event_t *event)
{
if ( (debugger_flags & DBG_FLAG_CAN_CONT_BPT) == 0 )
{
// difficult case: we have to reset pc, remove the bpt, single step, and resume the app
handling_lowcnd = true;
regval_t rv;
rv._set_int(lc->ea);
int code = dbg_write_register(event->tid, pc_idx, &rv);
if ( code <= 0 )
{
handling_lowcnd = false;
return false;
}
code = dbg_freeze_threads_except(event->tid);
if ( code > 0 )
{
code = dbg_del_bpt(lc->type, lc->ea, lc->orgbytes.begin(), lc->orgbytes.size());
if ( code > 0 )
{
code = dbg_perform_single_step(event, lc->cmd);
if ( code <= 0 )
dmsg("%a: failed to single step\n", event->ea); // may happen
if ( dbg_add_bpt(lc->type, lc->ea, lc->orgbytes.size()) <= 0 )
{
code = 0;
dwarning("%a: could not restore deleted bpt\n", lc->cmd.ea); // odd
}
}
if ( dbg_thaw_threads_except(event->tid) <= 0 )
{
dwarning("%d: could not resume suspended threads\n", event->tid); // odd
code = 0;
}
}
handling_lowcnd = false;
if ( code <= 0 || event->eid != STEP )
return false; // did not resume
}
return dbg_continue_after_event(event);
}
//--------------------------------------------------------------------------
// Cleanup after appcall()
// The debugger module must keep the stack blob in the memory until this function
// is called. It will be called by the kernel for each successful call_app_func()
int idaapi debmod_t::dbg_cleanup_appcall(thid_t tid)
{
call_contexts_t &calls = appcalls[tid];
if ( calls.empty() )
return 0;
// remove the return breakpoint
call_context_t &ctx = calls.back();
if ( !preprocess_appcall_cleanup(tid, ctx) )
return 0;
dbg_del_bpt(BPT_SOFT, ctx.ctrl_ea, bpt_code.begin(), bpt_code.size());
if ( ctx.regs_spoiled )
{
if ( !write_registers(tid, 0, ctx.saved_regs.size(), ctx.saved_regs.begin()) )
{
dmsg("Failed to restore registers!\n");
return 0;
}
}
calls.pop();
return events.empty() ? 1 : 2;
}
//--------------------------------------------------------------------------
int idaapi debmod_t::dbg_update_bpts(
update_bpt_info_t *bpts,
int nadd,
int ndel)
{
// Write breakpoints to the process
int cnt = 0;
update_bpt_info_t *b;
update_bpt_info_t *end = bpts + nadd;
for ( b=bpts; b != end; b++ )
{
int code = b->code;
if ( code != BPT_OK )
continue;
uchar len;
char buf[32];
int nread = 0;
ea_t ea = b->ea;
if ( b->type == BPT_SOFT )
{
len = bpt_code.size();
#ifdef __ARM__
if ( (ea & 1) != 0 ) // T bit is set, use a thumb breakpoint
{
ea--;
len = 2;
}
#endif
nread = len;
if ( (debugger_flags & DBG_FLAG_CAN_CONT_BPT) == 0 )
{ // we must save the original bytes before adding the bpt
QASSERT(30017, sizeof(buf) >= len);
if ( dbg_read_memory(ea, buf, len) <= 0 )
code = BPT_READ_ERROR;
}
}
else
{
len = b->size;
}
if ( code == BPT_OK )
code = dbg_add_bpt(b->type, ea, len) ? BPT_OK : BPT_WRITE_ERROR;
b->code = code;
if ( code == BPT_OK )
{
cnt++;
if ( nread > 0 )
b->orgbytes = bytevec_t(buf, nread);
}
}
// Delete breakpoints from the process.
end += ndel;
for ( ; b != end; b++ )
{
b->code = BPT_OK;
int len = b->type == BPT_SOFT ? b->orgbytes.size() : b->size;
if ( dbg_del_bpt(b->type, b->ea, b->orgbytes.begin(), len) > 0 )
cnt++;
else
b->code = BPT_WRITE_ERROR;
}
return cnt;
}
//--------------------------------------------------------------------------
int idaapi debmod_t::dbg_update_bpts(
update_bpt_info_t *ubpts,
int nadd,
int ndel)
{
// Write breakpoints to the process
int cnt = 0;
update_bpt_info_t *b;
update_bpt_info_t *end = ubpts + nadd;
for ( b=ubpts; b != end; b++ )
{
int code = b->code;
if ( code != BPT_OK )
continue; // should be BPT_SKIP
int len;
uchar buf[32];
memset(buf, 0, sizeof(buf));
int nread = 0;
ea_t ea = b->ea;
if ( b->type == BPT_SOFT )
{
len = bpt_code.size();
nread = read_bpt_orgbytes(&ea, &len, buf, sizeof(buf));
if ( nread < 0 )
code = BPT_READ_ERROR;
}
else
{
len = b->size;
}
if ( code == BPT_OK )
{
switch ( dbg_add_bpt(b->type, ea, len) )
{
case 2:
code = BPT_PAGE_OK;
break;
case 1:
code = BPT_OK;
break;
default:
code = BPT_WRITE_ERROR;
break;
}
}
b->code = code;
if ( code == BPT_OK )
{
cnt++;
if ( nread > 0 )
b->orgbytes = bytevec_t(buf, nread);
}
}
// Delete breakpoints from the process.
end += ndel;
for ( ; b != end; b++ )
{
b->code = BPT_OK;
int len = b->type == BPT_SOFT ? b->orgbytes.size() : b->size;
if ( dbg_del_bpt(b->type, b->ea, b->orgbytes.begin(), len) > 0 )
cnt++;
else
b->code = BPT_WRITE_ERROR;
}
return cnt;
}
