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Update documentation (2016-09-01)

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MerryMage 2016-09-01 20:23:37 +01:00
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docs/Design.md
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# Dynarmic Design Documentation
While Dynarmic is a primarily a dynamic recompiler for the ARMv6K architecture, the possibility of supporting
other versions of the ARM architecture, having a interpreter and/or static recompiler mode, or supporting
other architectures is kept open. This is done by having each component as modular as possible.
Dynarmic is a dynamic recompiler for the ARMv6K architecture. Future plans for dynarmic include
support for other versions of the ARM architecture, having a interpreter mode, and adding support
for other architectures.
Users of this library interact with it primarily through [`src/interface/interface.h`](../src/interface/interface.h).
Users of this library interact with it primarily through [`include/dynarmic/dynarmic.h`](../include/dynarmic/dynarmic.h).
Users specify how dynarmic's CPU core interacts with the rest of their systems by setting members of the
`Dynarmic::UserCallbacks` structure as appropriate. Users setup the CPU state using member fucntions of
[`Dynarmic::UserCallbacks`](../include/dynarmic/callbacks.h) structure as appropriate. Users setup the CPU state using member functions of
`Dynarmic::Jit`, then call `Dynarmic::Jit::Execute` to start CPU execution. The callbacks defined on `UserCallbacks`
may be called from dynamically generated code, so users of the library should not depend on the stack being in a
walkable state for unwinding.
@ -23,10 +23,10 @@ through several stages:
Using the x64 backend as an example:
* Decoding is done by [double dispatch](https://en.wikipedia.org/wiki/Visitor_pattern) in
`src/frontend/decoder/{[arm.h](../src/frontend/decoder/arm.h),[thumb16.h](../src/frontend/decoder/thumb.h),[thumb32.h](../src/frontend/decoder/thumb32.h)}`.
[`src/frontend/decoder/{arm.h,thumb16.h,thumb32.h}`](../src/frontend/decoder/).
* Translation is done by the visitors in `src/frontend/translate/translate_{arm,thumb}.cpp`.
The function [`IR::Block Translate(LocationDescriptor descriptor, MemoryRead32FuncType memory_read_32)`](../src/frontend/translate/translate.h) takes a
memory location and memory reader callback and returns a basic block of IR.
memory location, some CPU state, and memory reader callback and returns a basic block of IR.
* The IR can be found under [`src/frontend/ir/`](../src/frontend/ir/).
* Optimizations can be found under [`src/ir_opt/`](../src/ir_opt/).
* Emission is done by `EmitX64` which can be found in `src/backend_x64/emit_x64.{h,cpp}`.
@ -58,7 +58,7 @@ error results.
## Translator
The translator is a visitor that uses the decoder to decode instructions. The translator generates IR code with the
help of the [`IRBuilder` class](../src/frontend/ir/ir_emitter.h). An example of a translation function follows:
help of the [`IREmitter` class](../src/frontend/ir/ir_emitter.h). An example of a translation function follows:
bool ArmTranslatorVisitor::arm_ADC_imm(Cond cond, bool S, Reg n, Reg d, int rotate, Imm8 imm8) {
u32 imm32 = ArmExpandImm(rotate, imm8);
@ -140,9 +140,8 @@ optimized away.
Gets and sets bits in `JitState::Cpsr`. Similarly to registers redundant get/sets are optimized away.
### Context: {ALU,BX}WritePC
### Context: BXWritePC
<void> ALUWritePC(<u32> value)
<void> BXWritePC(<u32> value)
This should probably be the last instruction in a translation block unless you're doing something fancy.