svn commit: r231350 - in head/lib/libthr/arch/mips: include mips

[Oleksandr Tymoshenko]

Author: gonzo
Date: Fri Feb 10 06:53:25 2012
New Revision: 231350
URL: http://svn.freebsd.org/changeset/base/231350

Log:
  Switch MIPS TLS implementation to Variant I:
  
  Save pointer to the TLS structure taking into account TP_OFFSET
  and TCB structure size.

Modified:
  head/lib/libthr/arch/mips/include/pthread_md.h
  head/lib/libthr/arch/mips/mips/pthread_md.c

Modified: head/lib/libthr/arch/mips/include/pthread_md.h
==============================================================================
--- head/lib/libthr/arch/mips/include/pthread_md.h	Fri Feb 10 06:44:30 2012	(r231349)
+++ head/lib/libthr/arch/mips/include/pthread_md.h	Fri Feb 10 06:53:25 2012	(r231350)
@@ -39,15 +39,19 @@
 
 #define	CPU_SPINWAIT
 #define	DTV_OFFSET		offsetof(struct tcb, tcb_dtv)
+#ifdef __mips_n64
+#define	TP_OFFSET		0x7010
+#else
+#define	TP_OFFSET		0x7008
+#endif
 
 /*
- * Variant II tcb, first two members are required by rtld.
+ * Variant I tcb. The structure layout is fixed, don't blindly
+ * change it!
  */
 struct tcb {
-	struct tcb		*tcb_self;	/* required by rtld */
-	void			*tcb_dtv;	/* required by rtld */
-	struct pthread		*tcb_thread;	/* our hook */
-	void			*tcb_spare[1];
+	void			*tcb_dtv;
+	struct pthread		*tcb_thread;
 };
 
 /*
@@ -61,7 +65,7 @@ static __inline void
 _tcb_set(struct tcb *tcb)
 {
 
-	sysarch(MIPS_SET_TLS, tcb);
+	sysarch(MIPS_SET_TLS, ((uint8_t*)tcb + TP_OFFSET));
 }
 
 /*
@@ -70,10 +74,10 @@ _tcb_set(struct tcb *tcb)
 static __inline struct tcb *
 _tcb_get(void)
 {
-	void *tcb;
+	uint8_t *tcb;
 
 	sysarch(MIPS_GET_TLS, &tcb);
-	return tcb;
+	return ((struct tcb *)(tcb - TP_OFFSET));
 }
 
 extern struct pthread *_thr_initial;

Modified: head/lib/libthr/arch/mips/mips/pthread_md.c
==============================================================================
--- head/lib/libthr/arch/mips/mips/pthread_md.c	Fri Feb 10 06:44:30 2012	(r231349)
+++ head/lib/libthr/arch/mips/mips/pthread_md.c	Fri Feb 10 06:53:25 2012	(r231350)
@@ -34,6 +34,8 @@ __FBSDID("$FreeBSD$");
 #include <rtld_tls.h>
 #include <strings.h>
 
+#include <machine/sysarch.h>
+
 #include "pthread_md.h"
 
 struct tcb *
@@ -41,16 +43,17 @@ _tcb_ctor(struct pthread *thread, int in
 {
 	struct tcb *tcb;
 
-	tcb = malloc(sizeof(struct tcb));
-	if (tcb) {
-		bzero(tcb, sizeof(struct tcb));
+	tcb = _rtld_allocate_tls((initial) ? _tcb_get() :  NULL,
+	    sizeof(struct tcb), 16);
+	if (tcb)
 		tcb->tcb_thread = thread;
-	}
+
 	return (tcb);
 }
 
 void
 _tcb_dtor(struct tcb *tcb)
 {
-	free(tcb);
+
+	_rtld_free_tls(tcb, sizeof(struct tcb), 16);
 }