code: plan9front

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ref: 3613f5061be5fa0459cd7282ad99ede9c3cc67ea
parent: 85d0f0e1a2c05afee5a101c1e51a3ddd2ff2a5f6
author: Jacob Moody <moody@posixcafe.org>
date: Mon Dec 11 13:42:31 EST 2023 

libc: deduplicate fake cycles() imeplementation to port/

This also fixes the sparc and 68020 libc, since their mkfiles
referenced a dummy cycles.c that was never in their subdir.

Likewise while the 68000 libc would build, linking a program
against it would fail due to missing a _tas implementation.
This copies the 68020 implementation to alleviate this.


--- a/sys/src/libc/68000/cycles.c
+++ /dev/null
@@ -1,7 +1,0 @@
-#include <u.h>
-#include <libc.h>
-
-void	cycles(uvlong*u)
-{
-	*u = 0LL;
-}
--- a/sys/src/libc/68000/mkfile
+++ b/sys/src/libc/68000/mkfile
@@ -22,9 +22,9 @@
 	strcmp.s\
 	strcpy.s\
 	strlen.s\
+	tas.s\
 
 CFILES=\
-	cycles.c\
 	notejmp.c\
 	vlrt.c\
 
--- /dev/null
+++ b/sys/src/libc/68000/tas.s
@@ -1,0 +1,9 @@
+TEXT	_tas(SB), $0
+
+	MOVL	$0, R0
+	MOVL	a+0(FP), A0
+	TAS	(A0)
+	BEQ	tas_1
+	MOVL	$1, R0
+tas_1:
+	RTS
--- a/sys/src/libc/68020/mkfile
+++ b/sys/src/libc/68020/mkfile
@@ -26,7 +26,6 @@
 	vlop.s\
 
 CFILES=\
-	cycles.c\
 	notejmp.c\
 	vlrt.c\
 
--- a/sys/src/libc/arm/cycles.c
+++ /dev/null
@@ -1,10 +1,0 @@
-#include <u.h>
-#include <libc.h>
-
-#pragma profile off
-
-void
-cycles(uvlong*u)
-{
-	*u = 0LL;
-}
--- a/sys/src/libc/arm/mkfile
+++ b/sys/src/libc/arm/mkfile
@@ -20,7 +20,6 @@
 	vlop.s\
 
 CFILES=\
-	cycles.c\
 	notejmp.c\
 	vlrt.c\
 	lock.c\
--- a/sys/src/libc/mips/cycles.c
+++ /dev/null
@@ -1,7 +1,0 @@
-#include <u.h>
-#include <libc.h>
-
-void	cycles(uvlong*u)
-{
-	*u = 0LL;
-}
--- a/sys/src/libc/mips/mkfile
+++ b/sys/src/libc/mips/mkfile
@@ -22,7 +22,6 @@
 	vlop.s\
 
 CFILES=\
-	cycles.c\
 	lock.c\
 	notejmp.c\
 	sqrt.c\
--- /dev/null
+++ b/sys/src/libc/port/cycles.c
@@ -1,0 +1,10 @@
+#include <u.h>
+#include <libc.h>
+
+#pragma profile off
+
+void
+cycles(uvlong *u)
+{
+	*u = 0LL;
+}
--- a/sys/src/libc/port/mkfile
+++ b/sys/src/libc/port/mkfile
@@ -20,6 +20,7 @@
 	cleanname.c\
 	crypt.c\
 	ctype.c\
+	cycles.c\
 	date.c\
 	encodefmt.c\
 	execl.c\
--- a/sys/src/libc/sparc/mkfile
+++ b/sys/src/libc/sparc/mkfile
@@ -22,7 +22,6 @@
 	vlop.s
 
 CFILES=\
-	cycles.c\
 	notejmp.c\
 	sqrt.c\
 	vlrt.c\
--- a/sys/src/libc/spim/mkfile
+++ b/sys/src/libc/spim/mkfile
@@ -16,7 +16,6 @@
 	strcpy.s\
 
 MIPSCFILES=\
-	cycles.c\
 	notejmp.c\
 
 SFILES=\