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powerpc/boot: Make use of REL16 relocs in powerpc/boot/util.S 

Use bcl 20,31,0f rather than plain bl to avoid unbalancing the link
stack.

Update the code to use REL16 relocs, available for ppc64 in 2009 (and
ppc32 in 2005).

Signed-off-by: Alan Modra <amodra@gmail.com>
[mpe: Incorporate more detail into the change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alan Modra 2020-11-27 11:48:42 +11:00 committed by Michael Ellerman
parent f47462c9d8
commit 3d635aba0b
1 changed files with 3 additions and 6 deletions
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9
arch/powerpc/boot/util.S
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@ -42,14 +42,11 @@ udelay:
* (nanoseconds + (timebase_period_ns - 1 )) / timebase_period_ns
* timebase_period_ns defaults to 60 (16.6MHz) */
mflr r5
bl 0f
bcl 20,31,0f
0: mflr r6
mtlr r5
lis r5,0b@ha
addi r5,r5,0b@l
subf r5,r5,r6 /* In case we're relocated */
addis r5,r5,timebase_period_ns@ha
lwz r5,timebase_period_ns@l(r5)
addis r5,r6,(timebase_period_ns-0b)@ha
lwz r5,(timebase_period_ns-0b)@l(r5)
add r4,r4,r5
addi r4,r4,-1
divw r4,r4,r5 /* BUS ticks */