This system process handles displaying the error screens, such as "an error has occurred, the system needs shutdown". This can also display a register dump for exceptions, and info for fatal errors. (Normally the black-screen errors are displayed on retail, while the latter is displayed on development units.)
The register dump/fatal error info can also be written to nandrw/sys/native.log. On retail consoles, the system does not notify ErrDisp that any user-land exceptions occurred, ErrDisp is only notified for this on dev/debug units. Therefore, on retail consoles native.log only contains info from fatal errors. Starting with 5.0.0-11 ErrDisp no longer writes logs to native.log, except when the error-type is value 5 and when other checks with the errorinfo structure are successful (normally processes using this port never use error-type 5).
The bottom screen displays the error screen like "error has occurred", even with a development 3DS. The top screen can display the development error info, this is only displayed when UNITINFO bit0 is clear, for a development 3DS.
ErrDisp handles "returning" to Home Menu via NSS:RebootSystem, which triggers a hardware system reboot.
ErrDisp error port "err:f"
| Command Header | Description |
|---|---|
| 0x00010800 | ThrowFatalError(0x80-byte errorinfo) |
| 0x00020042 | (size, (size<<14) | 2, errorinfoptr) This is similar to cmd1, except with this the input buffer is copied to final output errorinfo+0x80 instead of +0x0, via the ARM11 kernel. Max size is 0x100. ErrDisp doesn't do anything in the cmd-handler for this command at all, besides checking the command header and buffer header. |
output, where *((u8*)errinfo) == 0 or 1
| Entry | Format string | Format args | Description |
|---|---|---|---|
| PID | 0x%08X_0x%08X | *(u32*)(errinfo + 0x10), *(u32*)(errinfo + 0x14) | Process ID |
| REV | %d | *(u16*)(errinfo + 2) | (*(u8*)(errinfo + 1) << 16) | ? |
| AID | 0x%08X_0x%08X | *(u32*)(errinfo + 0x18), *(u32*)(errinfo + 0x1C) | Application ID? |
| ADR | 0x%08X | *(u32*)(errinfo + 8) | Address where the error was thrown from? |
| RSL | 0x%08X | *(u32*)(errinfo + 4) | Error code |
| Level | %d | *(u32*)(errinfo + 4) & 0x80000000 ? (*(u32*)(errinfo + 4) >> 0x27) - 0x20 : *(u32*)(errinfo + 4) >> 0x27 | Error code level |
| Summary | %d | (*(u32*)(errinfo + 4) & 0x7E00000) >> 21 | Error code summary |
| Module | %d | (*(u32*)(errinfo + 4) & 0x3FC00) >> 10 | Error code module |
| Desc | %d | *(u32*)(errinfo + 4) & 0x3FF | Error code description |
| Datetime | %04d/%02d/%02d %02d:%02d:%02d | ? | ? |
output, where *((u8*)errinfo) == 4
| Entry | Format string | Format args | Description |
|---|---|---|---|
| PID | 0x%08X_0x%08X | *(u32*)(errinfo + 0x10), *(u32*)(errinfo + 0x14) | Process ID |
| REV | %d | *(u16*)(errinfo + 2) | (*(u8*)(errinfo + 1) << 16) | ? |
| AID | 0x%08X_0x%08X | *(u32*)(errinfo + 0x18), *(u32*)(errinfo + 0x1C) | Application ID? |
| RSL | 0x%08X | *(u32*)(errinfo + 4) | Error code |
| Level | %d | *(u32*)(errinfo + 4) & 0x80000000 ? (*(u32*)(errinfo + 4) >> 0x27) - 0x20 : *(u32*)(errinfo + 4) >> 0x27 | Error code level |
| Summary | %d | (*(u32*)(errinfo + 4) & 0x7E00000) >> 21 | Error code summary |
| Module | %d | (*(u32*)(errinfo + 4) & 0x3FC00) >> 10 | Error code module |
| Desc | %d | *(u32*)(errinfo + 4) & 0x3FF | Error code description |
| ? | %0.*s | 0x2E, for (int i = 0; i < 2; i++) (errinfo + (((i << 3) - i) + (i << 4)) << 1) + 0x20 | ? |
| Datetime | %04d/%02d/%02d %02d:%02d:%02d | ? | ? |