Support large physical addresses
When the 'P' switch is given to *Memory, *MemoryI or *MemoryA, all address
and offset arguments are parsed as 64-bit numbers, and all physical addresses
are displayed as 40-bit numbers. (The truncation from 64 bits is to avoid the
standard width of *Memory output overflowing an 80-character-wide window, and
should be fine in practice because even LPAE is limited to 40-bit addresses.)
There is no facility for constructing physical address from a low-high register pair on the command line. However, if you know the literal value of the upper bits of a physical address, you could construct the offset manually, for example:
*Memory P r0+100000000 +100Internally, this means all addresses are passed around as 64-bit numbers. To limit the amount of register allocation changes required, the values of pointers are now mostly stored on the stack. Physical address lookups are done usng OS_Memory 22 on kernels which provide it, falling back to OS_Memory 14 and then the logical mapping of physical space on early non-HAL kernels. Because OS_Memory 22 can return errors, there are now many more code paths that have to handle them.
Other bugs fixed in passing:
- Correct syntax error is printed for malformed
*MemoryAcommands - PC and breakpoint markers are not displayed in physical address mode
- Errors reported from OS_WriteC within DisplayCharacters were being corrupted
Requires header export from RiscOS/Sources/Kernel!3 (merged) in order to build (softload versions should still run elsewhere though).