Archipelago » qemu

target-arm: Drop success/fail return from cpreg read and write functions

All cpreg read and write functions now return 0, so we can clean up
their prototypes: * write functions return void * read functions return the value rather than taking a pointer
to write the value to...

target-arm: Convert generic timer reginfo to accessfn

Convert the reginfo structs for the generic timer registers
to use access functions rather than returning EXCP_UDEF from
their read handlers. In some cases this allows us to remove
a read handler completely....

target-arm: Log bad system register accesses with LOG_UNIMP

Log guest attempts to access unimplemented system registers via
the LOG_UNIMP reporting mechanism (for both the 32 bit and 64 bit
instruction sets). This is particularly useful for debugging
problems where the guest is trying to use a system register that...

target-arm: Split cpreg access checks out from read/write functions

Several of the system registers handled via the ARMCPRegInfo
mechanism have access trap control bits controlling whether the
registers are accessible to lower privilege levels. Replace
the existing mechanism (allowing the read and write functions...

target-arm: Restrict check_ap() use of S and R bits to v6 and earlier

The SCTLR bits S and R (8 and 9) only exist in ARMv6 and earlier.
In ARMv7 these bits RAZ, and in ARMv8 they are reassigned. Guard
the use of them in check_ap() so that we don't get incorrect results...