TempleOSCDV4.11.ISO

Demo/Asm/AsmAndC2.HC

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+/*Asm labels can only be defined once
+in a task.  <F5> will spawn a new task
+each time, so you don't get redefine
+error, like when repeatedly #including
+it from the cmd line.
+*/
+
+//This is to demo glbl var access.
+//Glbs defined elsewhere can accessed too, like cnts.jiffies.
+I64 glbl_hz=400,glbl_hz_step=100,glbl_hz_base=100;
+
+asm {
+//Opcodes are slightly different to make writing my x86_64 assembler easier.
+//See $LK,"::/Compiler/OpCodes.DD"$.
+
+JIFFIES_MSG:	DU8 "Jiffies:",0;
+
+//See $LK,"::/Kernel/StrA.HC",A="FL:::/Kernel/StrA.HC,1"$ and $LK,"::/Kernel/KUtils.HC"$.
+
+_BEEPS2::
+//You can clobber RAX,RBX,RCX,RDX,R8,R9.  The compiler expects that.
+//See $LK,"REGG_CLOBBERED",A="MN:REGG_CLOBBERED"$ and $LK,"REGG_STK_TEMP",A="MN:REGG_STK_TEMP"$.
+	PUSH	RBP
+	MOV	RBP,RSP
+	MOV	RCX,U64 SF_ARG1[RBP] //$LK,"SF_ARG1",A="FF:::/Kernel/KernelA.HH,SF_ARG1"$
+
+	PUSH	U64 [&cnts.jiffies]
+
+@@05:	PUSH	RCX
+//U0 $LK,"Beep",A="MN:Beep"$(I64 freq=500,Bool busy=FALSE)
+	PUSH	FALSE	//Do not busy (spin) wait
+	PUSH	U64 [&glbl_hz]	//evaluated at run time
+	CALL	&Beep
+	POP	RCX
+	LOOP	@@05
+
+	PUSH	RSI	//See $LK,"REGG_LOCAL_VARS",A="MN:REGG_LOCAL_VARS"$ & $LK,"REGG_LOCAL_NON_PTR_VARS",A="MN:REGG_LOCAL_NON_PTR_VARS"$
+	MOV	RSI,JIFFIES_MSG
+	CALL	PUT_STR
+	POP	RSI
+
+	POP	RAX
+	SUB	RAX,U64 [&cnts.jiffies]
+	NEG	RAX
+	CALL	PUT_HEX_U64
+	MOV	RAX,'\n'
+	CALL	PUT_CHARS
+
+	POP	RBP
+	RET1	8
+}
+
+//My convention is to put an underscore
+//on C callable asm routines.
+_extern _BEEPS2 U0 Beeps2(I64 cnt);
+
+U0 AsmAndC2()
+{
+  I64 reg R15 i;
+
+  i=GetI64("$$PURPLE$$\n\nNum of beeps 1-5 (%d):$$FG$$",3,1,5);
+  Beeps2(i);
+
+  asm {
+    LIST
+//You can clobber RAX,RBX,RCX,RDX, but preserve the rest.
+
+    MOV	RCX,R15 //You can clobber RAX,RBX,RCX,RDX. Preserve the rest.
+
+    @@05:	PUSH	RCX
+//U0 $LK,"Snd",A="MN:Snd"$(F64 freq);
+
+    MOV	RAX,RCX	//freq=loop*100.0+100.0
+    IMUL2	RAX,glbl_hz_step	//evaluated at compile ttime
+    ADD	RAX,U64 [&glbl_hz_base] //evaluated at run time
+    PUSH	RAX
+    FILD	U64 [RSP]	//Convert from int to floating
+    FSTP	U64 [RSP]
+
+    CALL	&Snd	//We can skip IMPORT with & if JIT compiling.
+
+    MOV	RCX,cnts.time_stamp_freq>>3	//JIT Const.  Simple delay loop.
+@@10:	LOOP	@@10
+
+    POP	RCX
+    LOOP	@@05
+  }
+  Snd(0);
+}
+
+AsmAndC2;