powerpc/book3e: support CONFIG_RELOCATABLE

book3e is different with book3s since 3s includes the exception
vectors code in head_64.S as it relies on absolute addressing
which is only possible within this compilation unit. So we have
to get that label address with got.

And when boot a relocated kernel, we should reset ipvr properly again
after .relocate.

Signed-off-by: Tiejun Chen <[e-mail]>
[scottwood: cleanup and ifdef removal]
Signed-off-by: Scott Wood <[e-mail]>

arch/powerpc/include/asm/exception-64e.h

···
 #endif
 
 #define SET_IVOR(vector_number, vector_offset)	\
-	li	r3,vector_offset@l; 		\
-	ori	r3,r3,interrupt_base_book3e@l;	\
+	LOAD_REG_ADDR(r3,interrupt_base_book3e);\
+	ori	r3,r3,vector_offset@l;		\
 	mtspr	SPRN_IVOR##vector_number,r3;
 
 #endif /* _ASM_POWERPC_EXCEPTION_64E_H */

arch/powerpc/kernel/exceptions-64e.S

···
  * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
  */
 	/* Now we branch the new virtual address mapped by this entry */
-	LOAD_REG_IMMEDIATE(r6,2f)
+	bl	1f		/* Find our address */
+1:	mflr	r6
+	addi	r6,r6,(2f - 1b)
+	tovirt(r6,r6)
 	lis	r7,MSR_KERNEL@h
 	ori	r7,r7,MSR_KERNEL@l
 	mtspr	SPRN_SRR0,r6
···
 	mflr	r28
 	b	3b
 
+	.globl init_core_book3e
 init_core_book3e:
 	/* Establish the interrupt vector base */
-	LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
+	tovirt(r2,r2)
+	LOAD_REG_ADDR(r3, interrupt_base_book3e)
 	mtspr	SPRN_IVPR,r3
 	sync
 	blr

arch/powerpc/kernel/head_64.S

···
 	/* process relocations for the final address of the kernel */
 	lis	r25,PAGE_OFFSET@highest	/* compute virtual base of kernel */
 	sldi	r25,r25,32
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r26,r26)		/* on booke, we already run at PAGE_OFFSET */
+#endif
 	lwz	r7,__run_at_load-_stext(r26)
+#if defined(CONFIG_PPC_BOOK3E)
+	tophys(r26,r26)
+#endif
 	cmplwi	cr0,r7,1	/* flagged to stay where we are ? */
 	bne	1f
 	add	r25,r25,r26
 1:	mr	r3,r25
 	bl	relocate
+#if defined(CONFIG_PPC_BOOK3E)
+	/* IVPR needs to be set after relocation. */
+	bl	init_core_book3e
+#endif
 #endif
 
 /*
···
  * variable __run_at_load, if it is set the kernel is treated as relocatable
  * kernel, otherwise it will be moved to PHYSICAL_START
  */
+#if defined(CONFIG_PPC_BOOK3E)
+	tovirt(r26,r26)		/* on booke, we already run at PAGE_OFFSET */
+#endif
 	lwz	r7,__run_at_load-_stext(r26)
 	cmplwi	cr0,r7,1
 	bne	3f
 
+#ifdef CONFIG_PPC_BOOK3E
+	LOAD_REG_ADDR(r5, __end_interrupts)
+	LOAD_REG_ADDR(r11, _stext)
+	sub	r5,r5,r11
+#else
 	/* just copy interrupts */
 	LOAD_REG_IMMEDIATE(r5, __end_interrupts - _stext)
+#endif
 	b	5f
 3:
 #endif
···
 p_end:	.llong	_end - _stext
 
 4:	/* Now copy the rest of the kernel up to _end */
-#if defined(CONFIG_PPC_BOOK3E)
-	tovirt(r26,r26)
-#endif
 	addis	r5,r26,(p_end - _stext)@ha
 	ld	r5,(p_end - _stext)@l(r5)	/* get _end */
 5:	bl	copy_and_flush		/* copy the rest */