SVC: Difference between revisions
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| Available(normally not accessible due to SVC-access-control). | | Available(normally not accessible due to SVC-access-control). | ||
| No | | No | ||
| Backdoor(unsigned int CodeAddress) | | Backdoor(unsigned int CodeAddress) This is used/accessible by [[FIRM|Process9]]. | ||
|- | |- | ||
| 0x7C | | 0x7C | ||
| Line 882: | Line 882: | ||
u32 hmm?[2]; | u32 hmm?[2]; | ||
} | } | ||
= SVC7B Backdoor = | |||
This saves SVC-mode SP+LR on the user-mode stack, then sets the SVC-mode SP to the user-mode SP. This then calls the specified code in SVC-mode. Once the called code returns, this pops the saved SP+LR off the stack for restoring the SVC-mode SP, then returns from the svc7b handler. Note that this svc7b handler does not disable IRQs, if any IRQs/context-switches occur while the SVC-mode SP is set to the user-mode one here, the ARM11-kernel will crash(which hangs the whole ARM11-side system). | |||
= Kernel error-codes = | = Kernel error-codes = | ||