[TW#18925] Openocd reg command doesn't display register values

[projectgus]

When halted in gdb, info reg produces accurate register values but mon reg doesn't show anything, and mon reg REGNAME (ie mon reg PC) shows values as 0x00000000, even when gdb knows the correct value.

[projectgus]

Seems like the mon reg output is not always all-zeroes, although it often doesn't match the gdb register cache version.

[Spritetm]

That is because for whatever mysterious reason, the openocd monitor defaults to the app cpu. Do a targets esp32.cpu0 before it and it should target the pro cpu instead.

[krzychb]

Hi @projectgus,

I run info reg and mon reg with OpenOCD build from sources using the latest master.
For the common part displayed they now show the same result.

The mon reg pc command shows correct result as well.

(gdb) mon reg
===== Xtensa registers CPU0
(0) pc (/32): 0x400D17B3
(1) ar0 (/32): 0x00060023
(2) ar1 (/32): 0x3FFB4480
(3) ar2 (/32): 0x00000003
(4) ar3 (/32): 0x00060023
(5) ar4 (/32): 0x3FFE4350
(6) ar5 (/32): 0x3FFFFFF9
(7) ar6 (/32): 0x3FFE4369
(8) ar7 (/32): 0x3FFE4368
(9) ar8 (/32): 0x00000000
(10) ar9 (/32): 0x3FFB4460
(11) ar10 (/32): 0x00000003
(12) ar11 (/32): 0x00060023
(13) ar12 (/32): 0x00060023
(14) ar13 (/32): 0x00000000
(15) ar14 (/32): 0x00000001
(16) ar15 (/32): 0x3FFAF470
(17) ar16 (/32): 0x00000000
(18) ar17 (/32): 0x3FFAF4A0
(19) ar18 (/32): 0x00000005
(20) ar19 (/32): 0x3FFB4510
(21) ar20 (/32): 0x00000000
(22) ar21 (/32): 0x3FFB4550
(23) ar22 (/32): 0x00000002
(24) ar23 (/32): 0x3FFB4530
(25) ar24 (/32): 0x00000000
(26) ar25 (/32): 0x3FFB4520
(27) ar26 (/32): 0x00000000
(28) ar27 (/32): 0x00000000
(29) ar28 (/32): 0x00000000
(30) ar29 (/32): 0x00000000
(31) ar30 (/32): 0x00000000
(32) ar31 (/32): 0x00000000
(33) ar32 (/32): 0x00000000
(34) ar33 (/32): 0x3FFB3850
(35) ar34 (/32): 0x00000000
(36) ar35 (/32): 0x00000000
(37) ar36 (/32): 0x00000000
(38) ar37 (/32): 0x3FFB3830
(39) ar38 (/32): 0x00000000
(40) ar39 (/32): 0x00000000
(41) ar40 (/32): 0x00000000
(42) ar41 (/32): 0x00000000
(43) ar42 (/32): 0x00000000
(44) ar43 (/32): 0x00000000
(45) ar44 (/32): 0x800D06B6
(46) ar45 (/32): 0x3FFB3800
(47) ar46 (/32): 0x00000005
(48) ar47 (/32): 0x00000005
(49) ar48 (/32): 0x00060023
(50) ar49 (/32): 0x3FFAF6C0
(51) ar50 (/32): 0x00000000
(52) ar51 (/32): 0x00000001
(53) ar52 (/32): 0x400876A4
(54) ar53 (/32): 0x3FFB37F0
(55) ar54 (/32): 0x3FFE4350
(56) ar55 (/32): 0x3FFAE334
(57) ar56 (/32): 0x00060023
(58) ar57 (/32): 0x3FFB44A0
(59) ar58 (/32): 0x00000003
(60) ar59 (/32): 0x00060023
(61) ar60 (/32): 0x800D13AB
(62) ar61 (/32): 0x3FFB37D0
(63) ar62 (/32): 0x3FFE4350
(64) ar63 (/32): 0x0001BC8C
(65) lbeg (/32): 0x00000000
(66) lend (/32): 0x00000000
(67) lcount (/32): 0x00000000
(68) sar (/32): 0x00000000
(69) windowbase (/32): 0x0000000B
(70) windowstart (/32): 0x00000B00
(71) configid0 (/32): 0xC2BCFFFE
(72) configid1 (/32): 0x1CC5FE96
(73) ps (/32): 0x00060020
(74) threadptr (/32): 0x00000000
(75) br (/32): 0x00000000
(76) scompare1 (/32): 0x00000000
(77) acclo (/32): 0x00000000
(78) acchi (/32): 0x00000000
(79) m0 (/32): 0x00000000
(80) m1 (/32): 0x00000000
(81) m2 (/32): 0x00000000
(82) m3 (/32): 0x00000000
(83) expstate (/32): 0x00000000
(84) f64r_lo (/32): 0x00000000
(85) f64r_hi (/32): 0x00000000
(86) f64s (/32): 0x00000000
(87) f0 (/32)
(88) f1 (/32)
(89) f2 (/32)
(90) f3 (/32)
(91) f4 (/32)
(92) f5 (/32)
(93) f6 (/32)
(94) f7 (/32)
(95) f8 (/32)
(96) f9 (/32)
(97) f10 (/32)
(98) f11 (/32)
(99) f12 (/32)
(100) f13 (/32)
(101) f14 (/32)
(102) f15 (/32)
(103) fcr (/32)
(104) fsr (/32)
(105) mmid (/32)
(106) ibreakenable (/32): 0x00000001
(107) memctl (/32): 0x00000001
(108) atomctl (/32): 0x00000015
(109) ddr (/32)
(110) ibreaka0 (/32): 0x400D17B3
(111) ibreaka1 (/32): 0x00000000
(112) dbreaka0 (/32): 0x00000000
(113) dbreaka1 (/32): 0x00000000
(114) dbreakc0 (/32): 0x00000000
(115) dbreakc1 (/32): 0x00000000
(116) epc1 (/32): 0x400D067C
(117) epc2 (/32): 0x00000000
(118) epc3 (/32): 0x00000000
(119) epc4 (/32): 0x00000000
(120) epc5 (/32): 0x00000000
(121) epc6 (/32): 0x400D17B3
(122) epc7 (/32): 0x00000000
(123) depc (/32): 0x00000000
(124) eps2 (/32): 0x00000000
(125) eps3 (/32): 0x00000000
(126) eps4 (/32): 0x00000000
(127) eps5 (/32): 0x00000000
(128) eps6 (/32): 0x00060020
(129) eps7 (/32): 0x00000000
(130) excsave1 (/32): 0x80085007
(131) excsave2 (/32): 0x40000954
(132) excsave3 (/32): 0x40000A28
(133) excsave4 (/32): 0x40000AF8
(134) excsave5 (/32): 0x40000C68
(135) excsave6 (/32): 0x00000000
(136) excsave7 (/32): 0x00000000
(137) cpenable (/32): 0x00000000
(138) interrupt (/32): 0x00018000
(139) intset (/32)
(140) intclear (/32)
(141) intenable (/32): 0x1300304C
(142) vecbase (/32): 0x40080000
(143) exccause (/32): 0x00000004
(144) debugcause (/32): 0x00000002
(145) ccount (/32): 0x011DBC31
(146) prid (/32): 0x0000CDCD
(147) icount (/32): 0x00000000
(148) icountlevel (/32): 0x00000000
(149) excvaddr (/32): 0x00000000
(150) ccompare0 (/32): 0x0134FFFC
(151) ccompare1 (/32): 0x00000000
(152) ccompare2 (/32): 0x00000000
(153) misc0 (/32): 0x00000000
(154) misc1 (/32): 0x00000000
(155) misc2 (/32): 0x00000000
(156) misc3 (/32): 0x00000000
(157) a0 (/32): 0x800D06B6
(158) a1 (/32): 0x3FFB3800
(159) a2 (/32): 0x00000005
(160) a3 (/32): 0x00000005 (dirty)
(161) a4 (/32): 0x00060023
(162) a5 (/32): 0x3FFAF6C0
(163) a6 (/32): 0x00000000
(164) a7 (/32): 0x00000001
(165) a8 (/32): 0x400876A4
(166) a9 (/32): 0x3FFB37F0
(167) a10 (/32): 0x3FFE4350
(168) a11 (/32): 0x3FFAE334
(169) a12 (/32): 0x00060023
(170) a13 (/32): 0x3FFB44A0
(171) a14 (/32): 0x00000003
(172) a15 (/32): 0x00060023

(gdb) info reg
pc             0x400d17b3	0x400d17b3 <app_main+3>
lbeg           0x0	0
lend           0x0	0
lcount         0x0	0
sar            0x0	0
ps             0x60020	393248
threadptr      0x0	0
br             0x0	0
scompare1      0x0	0
acclo          0x0	0
acchi          0x0	0
m0             0x0	0
m1             0x0	0
m2             0x0	0
m3             0x0	0
expstate       0x0	0
f64r_lo        0x0	0
f64r_hi        0x0	0
f64s           0x0	0
fcr            0x0	0
fsr            0x0	0
a0             0x800d06b6	-2146629962
a1             0x3ffb3800	1073428480
a2             0x5	5
a3             0x5	5
a4             0x60023	393251
a5             0x3ffaf6c0	1073411776
a6             0x0	0
a7             0x1	1
a8             0x400876a4	1074296484
a9             0x3ffb37f0	1073428464
a10            0x3ffe4350	1073627984
a11            0x3ffae334	1073406772
a12            0x60023	393251
a13            0x3ffb44a0	1073431712
a14            0x3	3
a15            0x60023	393251
(gdb) 

(gdb) mon reg pc
pc (/32): 0x400D17B3