PowerPC64 ABI fixes

1 files changed, 40 insertions, 33 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
index f1a55e64db..d14da54fd7 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
@@ -46,35 +46,32 @@ ENTRY (BP_SYM (__clone))
 	cror	cr0*4+eq,cr1*4+eq,cr0*4+eq
 	beq-	cr0,L(badargs)
 
-	/* Set up stack frame for parent.  */
-	stdu	r1,-80(r1)
-	cfi_adjust_cfa_offset (80)
-	std	r29,56(r1)
-	std	r30,64(r1)
-	std	r31,72(r1)
-	cfi_offset(r29,-56)
-	cfi_offset(r30,-64)
-	cfi_offset(r31,-72)
+	/* Save some regs in parm save area.  */
 #ifdef RESET_PID
-	std	r28,48(r1)
-	cfi_offset(r28,-48)
+	std	r29,48(r1)
 #endif
+	std	r30,56(r1)
+	std	r31,64(r1)
+#ifdef RESET_PID
+	cfi_offset(r29,48)
+#endif
+	cfi_offset(r30,56)
+	cfi_offset(r31,64)
 
 	/* Set up stack frame for child.  */
 	clrrdi	r4,r4,4
 	li	r0,0
-	stdu	r0,-48(r4) /* min stack frame is 48 bytes per ABI */
+	stdu	r0,-112(r4) /* min stack frame is 112 bytes per ABI */
 
 	/* Save fn, args, stack across syscall.  */
-	mr	r29,r3			/* Function in r29.  */
-	mr	r30,r4			/* Stack pointer in r30.  */
+	mr	r30,r3			/* Function in r30.  */
 #ifdef RESET_PID
-	mr	r28,r5			/* Flags in r28.  */
+	mr	r29,r5			/* Flags in r29.  */
 #endif
 	mr	r31,r6			/* Argument in r31.  */
 
-	/* 'flags' argument is first parameter to clone syscall. (The other
-	   argument is the stack pointer, already in r4.)  */
+	/* 'flags' argument is first parameter to clone syscall.
+	   Second is the stack pointer, already in r4.  */
 	mr	r3,r5
   /* Move the parent_tid, child_tid and tls arguments. */
 	mr	r5,r7
@@ -94,9 +91,9 @@ ENTRY (BP_SYM (__clone))
 	bne-	cr1,L(parent)		/* The '-' is to minimise the race.  */
 
 #ifdef RESET_PID
-	andis.	r0,r28,CLONE_THREAD>>16
+	andis.	r0,r29,CLONE_THREAD>>16
 	bne+	cr0,L(oldpid)
-	andi.	r0,r28,CLONE_VM
+	andi.	r0,r29,CLONE_VM
 	li	r3,-1
 	bne-	cr0,L(nomoregetpid)
 	DO_CALL(SYS_ify(getpid))
@@ -108,8 +105,8 @@ L(oldpid):
 
 	std	r2,40(r1)
 	/* Call procedure.  */
-	ld	r0,0(r29)
-	ld	r2,8(r29)
+	ld	r0,0(r30)
+	ld	r2,8(r30)
 	mtctr	r0
 	mr	r3,r31
 	bctrl
@@ -119,25 +116,35 @@ L(oldpid):
 	b	JUMPTARGET(__GI__exit)
 #else
 	b	JUMPTARGET(_exit)
+	/* We won't ever get here but provide a nop so that the linker
+	   will insert a toc adjusting stub if necessary.  */
+	nop
 #endif
 
+L(badargs):
+	cfi_startproc
+	li	r3,EINVAL
+	TAIL_CALL_SYSCALL_ERROR
+
 L(parent):
 	/* Parent.  Restore registers & return.  */
 #ifdef RESET_PID
-	ld	r28,48(r1)
+	cfi_offset(r29,48)
 #endif
-	ld	r31,72(r1)
-	ld	r30,64(r1)
-	ld	r29,56(r1)
-	addi	r1,r1,80
-	bnslr+
-	b	JUMPTARGET(__syscall_error)
-
-L(badargs):
-	li	r3,EINVAL
-	b	JUMPTARGET(__syscall_error)
+	cfi_offset(r30,56)
+	cfi_offset(r31,64)
+#ifdef RESET_PID
+	ld	r29,48(r1)
+#endif
+	ld	r30,56(r1)
+	ld	r31,64(r1)
+#ifdef RESET_PID
+	cfi_restore(r29)
+#endif
+	cfi_restore(r30)
+	cfi_restore(r31)
+	PSEUDO_RET
 
-	cfi_startproc
 END (BP_SYM (__clone))
 
 weak_alias (BP_SYM (__clone), BP_SYM (clone))