PowerPC: Rename __kernel_vdso_get_tbfreq to __kernel_get_tbfreq.

In order for the __kernel_get_tbfreq vDSO call to work the
INTERNAL_VSYSCALL_NCS macro needed to be updated to prevent it from
assuming an integer return type (since the timebase frequency is a 64-bit
value) by specifying the type of the return type as a macro parameter.  The
macro then specifically declares the return value as a 'register' (or
implied pair) of the denoted type.  The compiler is then informed that this
register (or implied pair) is to be used for the return value.
(cherry picked from commit 471a1672d4d55124de4db8273829f96cc14d424a)

5 files changed, 55 insertions, 29 deletions

diff --git a/ChangeLog b/ChangeLog
index b956949..56dd0e4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,25 @@
+2013-01-15  Anton Blanchard  <anton@samba.org>
+	    Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/unix/sysv/linux/powerpc/init-first.c: Rename
+	__kernel_vdso_get_tbfreq to __kernel_get_tbfreq.
+	* sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c: Add parameter to
+	INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK to specify return type.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+	(INTERNAL_VSYSCALL_NCS): Change "=&r" in inline asm output regs list to
+	"+r" and remove output regs list as redundant.  Add explicit inline
+	asm to specify register of return val to work around compiler codegen
+	bug.  Remove (int) cast on return value.  Add return type parameter to
+	use in macro so that this macro does not truncate return value for
+	64-bit values.
+	(INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Add return type parameter and
+	pass to INTERNAL_VSYSCALL_NCS.
+	(INLINE_VSYSCALL): Add 'long int' as return type to
+	INTERNAL_VSYSCALL_NCS macro invocation.
+	(INTERNAL_VSYSCALL): Add 'long int' as return type to
+	INTERNAL_VSYSCALL_NCS macro invocation.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h: Likewise.
+
 2013-01-09  Anton Blanchard  <anton@samba.org>
 
 	* sysdeps/unix/sysv/linux/powerpc/sched_getcpu.c: New file.
diff --git a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
index a863a27..021594c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
+++ b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
@@ -41,7 +41,8 @@ __get_clockfreq (void)
   /* If we can use the vDSO to obtain the timebase even better.  */
 #ifdef SHARED
   INTERNAL_SYSCALL_DECL (err);
-  timebase_freq = INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, 0);
+  timebase_freq =
+    INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, hp_timing_t, 0);
   if (INTERNAL_SYSCALL_ERROR_P (timebase_freq, err)
       && INTERNAL_SYSCALL_ERRNO (timebase_freq, err) == ENOSYS)
 #endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/init-first.c b/sysdeps/unix/sysv/linux/powerpc/init-first.c
index 6bcb7d5..5587e2a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/init-first.c
+++ b/sysdeps/unix/sysv/linux/powerpc/init-first.c
@@ -41,7 +41,7 @@ _libc_vdso_platform_setup (void)
 
   __vdso_clock_getres = _dl_vdso_vsym ("__kernel_clock_getres", &linux2615);
 
-  __vdso_get_tbfreq = _dl_vdso_vsym ("__kernel_vdso_get_tbfreq", &linux2615);
+  __vdso_get_tbfreq = _dl_vdso_vsym ("__kernel_get_tbfreq", &linux2615);
 
   __vdso_getcpu = _dl_vdso_vsym ("__kernel_getcpu", &linux2615);
 }
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
index da25c01..fa4116e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
@@ -60,7 +60,8 @@
 									      \
     if (__vdso_##name != NULL)						      \
       {									      \
-	sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args);   \
+	sc_ret =							      \
+	  INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, long int, nr, ##args);\
 	if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))			      \
 	  goto out;							      \
 	if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)		      \
@@ -90,7 +91,8 @@
 									      \
     if (__vdso_##name != NULL)						      \
       {									      \
-	v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
+	v_ret =								      \
+	  INTERNAL_VSYSCALL_NCS (__vdso_##name, err, long int, nr, ##args);   \
 	if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)			      \
 	    || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)		      \
 	  goto out;							      \
@@ -104,12 +106,12 @@
   INTERNAL_SYSCALL (name, err, nr, ##args)
 # endif
 
-# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...)	      \
+# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)  \
   ({									      \
-    long int sc_ret = ENOSYS;						      \
+    type sc_ret = ENOSYS;						      \
 									      \
     if (__vdso_##name != NULL)						      \
-      sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
+      sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, type, nr, ##args);  \
     else								      \
       err = 1 << 28;							      \
     sc_ret;								      \
@@ -126,7 +128,7 @@
    function call, with the exception of LR (which is needed for the
    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
    an error return status).  */
-# define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \
+# define INTERNAL_VSYSCALL_NCS(funcptr, err, type, nr, args...) \
   ({									      \
     register void *r0  __asm__ ("r0");					      \
     register long int r3  __asm__ ("r3");				      \
@@ -139,18 +141,18 @@
     register long int r10 __asm__ ("r10");				      \
     register long int r11 __asm__ ("r11");				      \
     register long int r12 __asm__ ("r12");				      \
+    register type rval  __asm__ ("r3");					      \
     LOADARGS_##nr (funcptr, args);					      \
     __asm__ __volatile__						      \
       ("mtctr %0\n\t"							      \
        "bctrl\n\t"							      \
        "mfcr %0"							      \
-       : "=&r" (r0),							      \
-	 "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),	      \
-	 "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)	      \
-       : ASM_INPUT_##nr							      \
-       : "cr0", "ctr", "lr", "memory");					      \
+       : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),  "+r" (r7),  \
+	 "+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12)	      \
+       : : "cr0", "ctr", "lr", "memory");				      \
     err = (long int) r0;						      \
-    (int) r3;								      \
+    __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4));	      \
+    rval;								      \
   })
 
 # undef INLINE_SYSCALL
@@ -191,7 +193,7 @@
     register long int r10 __asm__ ("r10");				\
     register long int r11 __asm__ ("r11");				\
     register long int r12 __asm__ ("r12");				\
-    LOADARGS_##nr(name, args);					\
+    LOADARGS_##nr(name, args);						\
     __asm__ __volatile__						\
       ("sc   \n\t"							\
        "mfcr %0"							\
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
index 059cf70..b4cdbbb 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
@@ -75,7 +75,8 @@
 									      \
     if (__vdso_##name != NULL)						      \
       {									      \
-	sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args);   \
+	sc_ret =							      \
+	  INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, long int, nr, ##args);\
 	if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))			      \
 	  goto out;							      \
 	if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)		      \
@@ -105,7 +106,8 @@
 									      \
     if (__vdso_##name != NULL)						      \
       {									      \
-	v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
+	v_ret =								      \
+	  INTERNAL_VSYSCALL_NCS (__vdso_##name, err, long int, nr, ##args);   \
 	if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)			      \
 	    || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)		      \
 	  goto out;							      \
@@ -121,12 +123,12 @@
 
 /* This version is for internal uses when there is no desire
    to set errno */
-#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...)	      \
+#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)   \
   ({									      \
-    long int sc_ret = ENOSYS;						      \
+    type sc_ret = ENOSYS;						      \
 									      \
     if (__vdso_##name != NULL)						      \
-      sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
+      sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, type, nr, ##args);  \
     else								      \
       err = 1 << 28;							      \
     sc_ret;								      \
@@ -142,7 +144,7 @@
    gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
    the negation of the return value in the kernel gets reverted.  */
 
-#define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \
+#define INTERNAL_VSYSCALL_NCS(funcptr, err, type, nr, args...) \
   ({									\
     register void *r0  __asm__ ("r0");					\
     register long int r3  __asm__ ("r3");				\
@@ -151,20 +153,19 @@
     register long int r6  __asm__ ("r6");				\
     register long int r7  __asm__ ("r7");				\
     register long int r8  __asm__ ("r8");				\
+    register type rval  __asm__ ("r3");				        \
     LOADARGS_##nr (funcptr, args);					\
     __asm__ __volatile__						\
       ("mtctr %0\n\t"							\
        "bctrl\n\t"							\
        "mfcr  %0\n\t"							\
        "0:"								\
-       : "=&r" (r0),							\
-         "=&r" (r3), "=&r" (r4), "=&r" (r5),				\
-         "=&r" (r6), "=&r" (r7), "=&r" (r8)				\
-       : ASM_INPUT_##nr							\
-       : "r9", "r10", "r11", "r12",					\
-         "cr0", "ctr", "lr", "memory");					\
-	  err = (long int) r0;						\
-    r3;								\
+       : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),        \
+         "+r" (r7), "+r" (r8)						\
+       : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory");	\
+    err = (long int) r0;						\
+    __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3));		        \
+    rval;								\
   })
 
 #undef INLINE_SYSCALL