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powerpc/64: Change the way relocation copy is calculated

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With a subsequent patch to put text into different sections,
(_end - _stext) can no longer be computed at link time to determine
the end of the copy. Instead, calculate it at runtime with
(copy_to_here - _stext) + (_end - copy_to_here).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2016-09-28 11:31:47 +10:00 committed by Michael Ellerman
parent be642c3457
commit 573819e343
1 changed files with 9 additions and 4 deletions
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13
arch/powerpc/kernel/head_64.S
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@ -628,11 +628,16 @@ __after_prom_start:
bctr bctr
.balign 8 .balign 8
p_end: .llong _end - _stext p_end: .llong _end - copy_to_here
4: /* Now copy the rest of the kernel up to _end */ 4:
addis r5,r26,(p_end - _stext)@ha /*
ld r5,(p_end - _stext)@l(r5) /* get _end */ * Now copy the rest of the kernel up to _end, add
* _end - copy_to_here to the copy limit and run again.
*/
addis r8,r26,(p_end - _stext)@ha
ld r8,(p_end - _stext)@l(r8)
add r5,r5,r8
5: bl copy_and_flush /* copy the rest */ 5: bl copy_and_flush /* copy the rest */
9: b start_here_multiplatform 9: b start_here_multiplatform