EFI: Make our haiku_loader architecture agnostic

* This is the bulk of the work. Anything else should be
  minor cleanups and tweaking.
* riscv64 isn't a viable EFI platform yet.. just acting
  as a stand-in to test a non-x86 EFI haiku_loader

Change-Id: Ib03de81e2b562e693987b86d7b4318209fb1c792
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2256
Reviewed-by: Alex von Gluck IV <[email protected]>
Reviewed-by: Adrien Destugues <[email protected]>

src/kits/debug/arch/riscv64/arch_debug_support.cpp

@@ -20,6 +20,8 @@ status_t
 arch_debug_get_instruction_pointer(debug_context *context, thread_id thread,
 	void **ip, void **stackFrameAddress)
 {
+	#warning TODO RISCV64 get instruction pointer
+	#if 0
 	// get the CPU state
 	debug_cpu_state cpuState;
 	status_t error = debug_get_cpu_state(context, thread, NULL, &cpuState);
@@ -28,6 +30,7 @@ arch_debug_get_instruction_pointer(debug_context *context, thread_id thread,
 
 	*ip = (void*)cpuState.rip;
 	*stackFrameAddress = (void*)cpuState.rbp;
+	#endif
 
 	return B_OK;
 }
@@ -37,6 +40,8 @@ status_t
 arch_debug_get_stack_frame(debug_context *context, void *stackFrameAddress,
 	debug_stack_frame_info *stackFrameInfo)
 {
+	#warning TODO RISCV64 get stack frame
+	#if 0
 	stack_frame stackFrame;
 	ssize_t bytesRead = debug_read_memory(context, stackFrameAddress,
 		&stackFrame, sizeof(stackFrame));
@@ -48,5 +53,7 @@ arch_debug_get_stack_frame(debug_context *context, void *stackFrameAddress,
 	stackFrameInfo->frame = stackFrameAddress;
 	stackFrameInfo->parent_frame = stackFrame.previous;
 	stackFrameInfo->return_address = stackFrame.return_address;
+	#endif
+
 	return B_OK;
 }