uintmax_t
mdb_dot_incr(const char *op)
{
uintmax_t odot, ndot;
odot = mdb_nv_get_value(mdb.m_dot);
ndot = odot + mdb.m_incr;
if ((odot ^ ndot) & 0x8000000000000000ull)
yyerror("'%s' would cause '.' to overflow\n", op);
return (ndot);
}
uintmax_t
mdb_dot_decr(const char *op)
{
uintmax_t odot, ndot;
odot = mdb_nv_get_value(mdb.m_dot);
ndot = odot - mdb.m_incr;
if (ndot > odot)
yyerror("'%s' would cause '.' to underflow\n", op);
return (ndot);
}
uintmax_t
mdb_get_dot(void)
{
return (mdb_nv_get_value(mdb.m_dot));
}
/*
* Call the current frame's mdb command. This entry point is used by the
* MDB parser to actually execute a command once it has successfully parsed
* a line of input. The command is waiting for us in the current frame.
* We loop through each command on the list, executing its dcmd with the
* appropriate argument. If the command has a successor, we know it had
* a | operator after it, and so we need to create a pipe and replace
* stdout with the pipe's output buffer.
*/
int
mdb_call(uintmax_t addr, uintmax_t count, uint_t flags)
{
mdb_frame_t *fp = mdb.m_frame;
mdb_cmd_t *cp, *ncp;
mdb_iob_t *iobs[2];
int status, err = 0;
jmp_buf pcb;
if (mdb_iob_isapipe(mdb.m_in))
yyerror("syntax error");
mdb_intr_disable();
fp->f_cp = mdb_list_next(&fp->f_cmds);
if (flags & DCMD_LOOP)
flags |= DCMD_LOOPFIRST; /* set LOOPFIRST if this is a loop */
for (cp = mdb_list_next(&fp->f_cmds); cp; cp = mdb_list_next(cp)) {
if (mdb_list_next(cp) != NULL) {
mdb_iob_pipe(iobs, rdsvc, wrsvc);
mdb_iob_stack_push(&fp->f_istk, mdb.m_in, yylineno);
mdb.m_in = iobs[MDB_IOB_RDIOB];
mdb_iob_stack_push(&fp->f_ostk, mdb.m_out, 0);
mdb.m_out = iobs[MDB_IOB_WRIOB];
ncp = mdb_list_next(cp);
mdb_vcb_inherit(cp, ncp);
bcopy(fp->f_pcb, pcb, sizeof (jmp_buf));
ASSERT(fp->f_pcmd == NULL);
fp->f_pcmd = ncp;
mdb_frame_set_pipe(fp);
if ((err = setjmp(fp->f_pcb)) == 0) {
status = mdb_call_idcmd(cp->c_dcmd, addr, count,
flags | DCMD_PIPE_OUT, &cp->c_argv,
&cp->c_addrv, cp->c_vcbs);
ASSERT(mdb.m_in == iobs[MDB_IOB_RDIOB]);
ASSERT(mdb.m_out == iobs[MDB_IOB_WRIOB]);
} else {
mdb_dprintf(MDB_DBG_DSTK, "frame <%u> caught "
"error %s from pipeline\n", fp->f_id,
mdb_err2str(err));
}
if (err != 0 || DCMD_ABORTED(status)) {
mdb_iob_setflags(mdb.m_in, MDB_IOB_ERR);
mdb_iob_setflags(mdb.m_out, MDB_IOB_ERR);
} else {
mdb_iob_flush(mdb.m_out);
(void) mdb_iob_ctl(mdb.m_out, I_FLUSH,
(void *)FLUSHW);
}
mdb_frame_clear_pipe(fp);
mdb_iob_destroy(mdb.m_out);
mdb.m_out = mdb_iob_stack_pop(&fp->f_ostk);
if (mdb.m_in != NULL)
mdb_iob_destroy(mdb.m_in);
mdb.m_in = mdb_iob_stack_pop(&fp->f_istk);
yylineno = mdb_iob_lineno(mdb.m_in);
fp->f_pcmd = NULL;
bcopy(pcb, fp->f_pcb, sizeof (jmp_buf));
if (MDB_ERR_IS_FATAL(err))
longjmp(fp->f_pcb, err);
if (err != 0 || DCMD_ABORTED(status) ||
mdb_addrvec_length(&ncp->c_addrv) == 0)
break;
addr = mdb_nv_get_value(mdb.m_dot);
count = 1;
flags = 0;
} else {
mdb_intr_enable();
(void) mdb_call_idcmd(cp->c_dcmd, addr, count, flags,
&cp->c_argv, &cp->c_addrv, cp->c_vcbs);
mdb_intr_disable();
}
fp->f_cp = mdb_list_next(cp);
mdb_cmd_reset(cp);
}
/*
* If our last-command list is non-empty, destroy it. Then copy the
* current frame's cmd list to the m_lastc list and reset the frame.
*/
while ((cp = mdb_list_next(&mdb.m_lastc)) != NULL) {
mdb_list_delete(&mdb.m_lastc, cp);
mdb_cmd_destroy(cp);
}
mdb_list_move(&fp->f_cmds, &mdb.m_lastc);
mdb_frame_reset(fp);
mdb_intr_enable();
return (err == 0);
}
