These three instructions use the B field (bits 16-20 of the opcode)
to determine what the operand register is. However, the code was
using the path that uses the C field (bits 21-25).
This amends the code to use the B field (and also fixes the 64-bit PPC
opcodes, because why not?).
Fixes issue 10683.
In the code view, it would never say r1 or r2, but rather sp (stack pointer) and rtoc (register of the table of content) respectively. In the register view, all it says is the register number. This is an inconvenience considering it might not be obvious which register belongs to which of these terms.
Also make r13 named the "sda" for small data area with the same convention as above.
Someone thought it would be a good idea to have the location as the first argument on the instruction.
Changed it to how it is supposed to be disassembled.
This moves the Gekko disassembler to Common where it should be. Having it in the Bochs disassembly Externals is incorrect.
Unlike the PowerPC disassembler prior however, this one is updated to have an API that is more fitting for C++. e.g. Not needing to specify a string buffer and size. It does all of this under the hood.
This modifies all the DebuggingInterfaces as necessary to handle this.
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