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JitArm64: Add documentation comment for EmitBackpatchRoutine

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This commit is contained in:
JosJuice 2022-04-23 11:37:52 +02:00
parent 2ef2d4778d
commit 14f9ffeb02
1 changed files with 20 additions and 1 deletions
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21
Source/Core/Core/PowerPC/JitArm64/Jit.h
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@ -215,10 +215,29 @@ protected:
// Dump a memory range of code
void DumpCode(const u8* start, const u8* end);
// Backpatching routines
// This is the core routine for accessing emulated memory, with support for
// many different kinds of loads and stores as well as fastmem backpatching.
//
// Registers used:
// addr scratch
// Store: X1 X0
// Load: X0
// Zero 256: X0 X30
// Store float: X1 Q0
// Load float: X0
//
// If fastmem && !do_farcode, the addr argument can be any register.
// Otherwise it must be the register listed in the table above.
//
// Additional scratch registers are used in the following situations:
// fastmem && do_farcode && emitting_routine: X2
// fastmem && do_farcode && emitting_routine && (flags & BackPatchInfo::FLAG_STORE): X0
// fastmem && do_farcode && emitting_routine && !(flags & BackPatchInfo::FLAG_STORE): X3
// !fastmem || do_farcode: X30 (plus lots more unless you set gprs_to_push and fprs_to_push)
void EmitBackpatchRoutine(u32 flags, bool fastmem, bool do_farcode, Arm64Gen::ARM64Reg RS,
Arm64Gen::ARM64Reg addr, BitSet32 gprs_to_push = BitSet32(0),
BitSet32 fprs_to_push = BitSet32(0), bool emitting_routine = false);
// Loadstore routines
void SafeLoadToReg(u32 dest, s32 addr, s32 offsetReg, u32 flags, s32 offset, bool update);
void SafeStoreFromReg(s32 dest, u32 value, s32 regOffset, u32 flags, s32 offset, bool update);