Управляющие регистры процессора ESP32-C3

[vak]

Считал содержимое машинных управляющих регистров микроконтроллера ESP32-C3.

ustatus    [000] = 00000001 mask 00000011 (max 00000011 min 00000000)
mstatus    [300] = 00000089 mask 00201899 (max 00201899 min 00000000)
misa       [301] = 40101104 mask 00000000 (max 40101104 min 40101104)
mtvec      [305] = 40380001 mask ffffff00 (max ffffff01 min 00000001)
mscratch   [340] = 00000000 mask ffffffff (max ffffffff min 00000000)
mepc       [341] = 42001c06 mask fffffffe (max fffffffe min 00000000)
mcause     [342] = 80000004 mask 8000001f (max 8000001f min 00000000)
mtval      [343] = fef76ae3 mask ffffffff (max ffffffff min 00000000)
pmpcfg0    [3a0] = 89888f88 mask 00000000 (max 89888f88 min 89888f88)
pmpcfg1    [3a1] = 888d898b mask 00000000 (max 888d898b min 888d898b)
pmpcfg2    [3a2] = 8f888d8f mask 00000000 (max 8f888d8f min 8f888d8f)
pmpcfg3    [3a3] = 90888b88 mask 00000000 (max 90888b88 min 90888b88)
pmpaddr0   [3b0] = 08000000 mask 00000000 (max 08000000 min 08000000)
pmpaddr1   [3b1] = 0a000000 mask 00000000 (max 0a000000 min 0a000000)
pmpaddr2   [3b2] = 0f000000 mask 00000000 (max 0f000000 min 0f000000)
pmpaddr3   [3b3] = 0ff20000 mask 00000000 (max 0ff20000 min 0ff20000)
pmpaddr4   [3b4] = 0ff38000 mask 00000000 (max 0ff38000 min 0ff38000)
pmpaddr5   [3b5] = 0ffc8000 mask 00000000 (max 0ffc8000 min 0ffc8000)
pmpaddr6   [3b6] = 10018000 mask 00000000 (max 10018000 min 10018000)
pmpaddr7   [3b7] = 100df000 mask 00000000 (max 100df000 min 100df000)
pmpaddr8   [3b8] = 100f8000 mask 00000000 (max 100f8000 min 100f8000)
pmpaddr9   [3b9] = 10a00000 mask 00000000 (max 10a00000 min 10a00000)
pmpaddr10  [3ba] = 14000000 mask 00000000 (max 14000000 min 14000000)
pmpaddr11  [3bb] = 14000800 mask 00000000 (max 14000800 min 14000800)
pmpaddr12  [3bc] = 18000000 mask 00000000 (max 18000000 min 18000000)
pmpaddr13  [3bd] = 18040000 mask 00000000 (max 18040000 min 18040000)
pmpaddr14  [3be] = 3fffffff mask 00000000 (max 3fffffff min 3fffffff)
pmpaddr15  [3bf] = 3fffffff mask 00000000 (max 3fffffff min 3fffffff)
tselect    [7a0] = 00000000 mask 00000007 (max 00000007 min 00000000)
tdata1     [7a1] = 23e00000 mask 001000cf (max 23f000cf min 23e00000)
tdata2     [7a2] = 00000000 mask ffffffff (max ffffffff min 00000000)
tcontrol   [7a5] = 00000080 mask 00000088 (max 00000088 min 00000000)
mpcer      [7e0] = 00000001 mask 00000fff (max 00000fff min 00000000)
mpcmr      [7e1] = 00000001 mask 00000003 (max 00000003 min 00000000)
mpccr      [7e2] = 048f67d3 mask ffffffff (max ffffffff min 00000000)
0x800      [800] = 00000001 mask 00000fff (max 00000fff min 00000000)
0x801      [801] = 00000001 mask 00000003 (max 00000003 min 00000000)
0x802      [802] = 04bc89aa mask ffffffff (max ffffffff min 00000000)
0x803      [803] = 00000000 mask 000000ff (max 000000ff min 00000000)
0x804      [804] = 00000000 mask 00000000 (max 00000000 min 00000000)
0x805      [805] = 00000000 mask 000000ff (max 000000ff min 00000000)
mvendorid  [f11] = 00000612 read only
marchid    [f12] = 80000001 read only
mimpid     [f13] = 00000001 read only
mhartid    [f14] = 00000000 read only

Несколько замечаний:

• Регистр ustatus отсутствует в документации процессора ESP32-C3.
• Регистры на адресах 0x800-x805 тоже не упоминаются, хотя код в ROM к ним обращается.
• Попытка записи в регистры mvendorid, marchid, mimpid и mhartid не игнорируется как обычно, а вызывает исключение Illegal Instruction.