Commit 7f664cf9 authored by Jeremy Kerr's avatar Jeremy Kerr Committed by Michael Ellerman
Browse files

powerpc/boot: don't clobber r6 and r7 in epapr boot 



We use r6 and r7 for epapr boot, but the current pre-C init will clobber
both of these.

This change does a simple replacement, of r6 -> r12 and r7 -> r13, so
that we hit platform init with these registers intact.

Signed-off-by: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 8c06f0d9

arch/powerpc/boot/crt0.S

+12 −12
Original line number Diff line number Diff line
@@ -155,29 +155,29 @@ p_base: mflr r10 /* r10 now points to runtime addr of p_base */ 
	ld	r9,(p_rela-p_base)(r10)

	add	r9,r9,r10



	li	r7,0

	li	r13,0

	li	r8,0

9:	ld	r6,0(r11)       /* get tag */

	cmpdi	r6,0

9:	ld	r12,0(r11)       /* get tag */

	cmpdi	r12,0

	beq	12f              /* end of list */

	cmpdi	r6,RELA

	cmpdi	r12,RELA

	bne	10f

	ld	r7,8(r11)       /* get RELA pointer in r7 */

	ld	r13,8(r11)       /* get RELA pointer in r13 */

	b	11f

10:	addis	r6,r6,(-RELACOUNT)@ha

	cmpdi	r6,RELACOUNT@l

10:	addis	r12,r12,(-RELACOUNT)@ha

	cmpdi	r12,RELACOUNT@l

	bne	11f

	ld	r8,8(r11)       /* get RELACOUNT value in r8 */

11:	addi	r11,r11,16

	b	9b

12:

	cmpdi	r7,0            /* check we have both RELA and RELACOUNT */

	cmpdi	r13,0            /* check we have both RELA and RELACOUNT */

	cmpdi	cr1,r8,0

	beq	3f

	beq	cr1,3f



	/* Calcuate the runtime offset. */

	subf	r7,r7,r9

	subf	r13,r13,r9



	/* Run through the list of relocations and process the

	 * R_PPC64_RELATIVE ones. */
@@ -185,10 +185,10 @@ p_base: mflr r10 /* r10 now points to runtime addr of p_base */ 
13:	ld	r0,8(r9)        /* ELF64_R_TYPE(reloc->r_info) */

	cmpdi	r0,22           /* R_PPC64_RELATIVE */

	bne	3f

	ld	r6,0(r9)        /* reloc->r_offset */

	ld	r12,0(r9)        /* reloc->r_offset */

	ld	r0,16(r9)       /* reloc->r_addend */

	add	r0,r0,r7

	stdx	r0,r7,r6

	add	r0,r0,r13

	stdx	r0,r13,r12

	addi	r9,r9,24

	bdnz	13b

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