Preliminary PIE support for powerpc, i386 was used as template.

Requested by Peter Mazinger. Testing wanted.

libc/sysdeps/linux/powerpc/Makefile

@@ -22,6 +22,9 @@ ASFLAGS=$(CFLAGS)
 
 CRT0_SRC = crt0.S
 CRT0_OBJ = crt0.o crt1.o
+ifeq ($(strip $(UCLIBC_PIE_SUPPORT)),y)
+CRT0_OBJ += Scrt0.o Scrt1.o
+endif
 CRT0_DEPS=gmon-start.S
 CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
 
@@ -41,6 +44,13 @@ $(LIBC): ar-target
 ar-target: $(OBJS) $(CRT0_OBJ) $(CTOR_TARGETS)
 	$(AR) $(ARFLAGS) $(LIBC) $(OBJS)
 	cp $(CRT0_OBJ) $(TOPDIR)lib/
+ifeq ($(strip $(UCLIBC_PIE_SUPPORT)),y)
+ifeq ($(strip $(UCLIBC_CTOR_DTOR)),y)
+	$(RM) $(TOPDIR)lib/Scrt0.o
+else
+	mv $(TOPDIR)lib/Scrt0.o $(TOPDIR)lib/Scrt1.o
+endif
+endif
 
 $(CRT0_OBJ): $(CRT0_SRC)
 	$(CC) $(CFLAGS) -DL_$* $< -c -o $*.o

libc/sysdeps/linux/powerpc/crt0.S

@@ -35,7 +35,7 @@
 	.section ".text"
 	.globl	_start
 	.type	_start,@function
-#if defined L_crt0 || ! defined __UCLIBC_CTOR_DTOR__
+#if defined L_crt0 || L_Scrt0 || ! defined __UCLIBC_CTOR_DTOR__
 	.type	__uClibc_main,%function
 #else
 	.weak	_init
@@ -66,16 +66,29 @@ _start:
 	addi	r5,r5,1
 	rlwinm	r5,r5,2,0,29
 	add	r5,r5,r4
-
+#if defined L_Scrt0 || defined L_Scrt1
+	bl	_GLOBAL_OFFSET_TABLE_-4@local
+	mflr	r31
+#endif
 	/* Ok, now run uClibc's main() -- shouldn't return */
-#if (defined L_crt1) && defined __UCLIBC_CTOR_DTOR__
+#if (defined L_crt1 || defined L_Scrt1) && defined __UCLIBC_CTOR_DTOR__
+# ifdef L_Scrt1
+	lwz	r6,_init@got(r31)
+	lwz	r7,_fini@got(r31)
+	bl	__uClibc_start_main@plt
+# else
 	lis     r6,_init@ha	# load top 16 bits
 	addi    r6,r6,_init@l	# load bottom 16 bits
 	lis     r7,_fini@ha	# load top 16 bits of &msg
 	addi    r7,r7,_fini@l	# load bottom 16 bits
 	bl	__uClibc_start_main
+# endif
 #else
+# ifdef L_Scrt0
+	bl	__uClibc_main@plt
+# else
 	bl	__uClibc_main
+# endif
 #endif
 .size _start,.-_start