static void
remove_bkpt(struct proc_handle *phdl, uintptr_t addr, u_long val)
{
int error;
error = proc_bkptdel(phdl, addr, val);
ATF_REQUIRE_EQ_MSG(error, 0,
"failed to delete breakpoint at 0x%jx", (uintmax_t)addr);
error = proc_regset(phdl, REG_PC, addr);
ATF_REQUIRE_EQ_MSG(error, 0, "failed to reset program counter");
}
/*
* Step over the breakpoint.
*/
int
proc_bkptexec(struct proc_handle *phdl, unsigned long saved)
{
unsigned long pc;
unsigned long samesaved;
int status;
if (proc_regget(phdl, REG_PC, &pc) < 0) {
warn("ERROR: couldn't get PC register");
return (-1);
}
proc_bkptregadj(&pc);
if (proc_bkptdel(phdl, pc, saved) < 0) {
warn("ERROR: couldn't delete breakpoint");
return (-1);
}
/*
* Go back in time and step over the new instruction just
* set up by proc_bkptdel().
*/
proc_regset(phdl, REG_PC, pc);
if (ptrace(PT_STEP, proc_getpid(phdl), (caddr_t)1, 0) < 0) {
warn("ERROR: ptrace step failed");
return (-1);
}
proc_wstatus(phdl);
status = proc_getwstat(phdl);
if (!WIFSTOPPED(status)) {
warn("ERROR: don't know why process stopped");
return (-1);
}
/*
* Restore the breakpoint. The saved instruction should be
* the same as the one that we were passed in.
*/
if (proc_bkptset(phdl, pc, &samesaved) < 0) {
warn("ERROR: couldn't restore breakpoint");
return (-1);
}
assert(samesaved == saved);
return (0);
}
