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powerpc/lib: Add alt patching test of branching past the last instruction

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Add a test of the relative branch patching logic in the alternate
section feature fixup code. This tests that if we branch past the last
instruction of the alternate section, the branch is not patched.
That's because the assembler will have created a branch that already
points to the first instruction after the patched section, which is
correct and needs no further patching.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman
2018-04-17 00:39:05 +10:00
parent b58e798796
commit 6158faed7c
2 changed files with 47 additions and 0 deletions
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arch/powerpc/lib/feature-fixups-test.S
+36
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@@ -171,6 +171,42 @@ globl(ftr_fixup_test6_expected)
or 2,2,2
or 3,3,3
globl(ftr_fixup_test7)
or 1,1,1
BEGIN_FTR_SECTION
or 2,2,2
or 2,2,2
or 2,2,2
or 2,2,2
or 2,2,2
or 2,2,2
or 2,2,2
FTR_SECTION_ELSE
2: b 3f
3: or 5,5,5
beq 3b
b 1f
or 6,6,6
b 2b
bdnz 3b
1:
ALT_FTR_SECTION_END(0, 1)
or 1,1,1
or 1,1,1
globl(end_ftr_fixup_test7)
nop
globl(ftr_fixup_test7_expected)
or 1,1,1
2: b 3f
3: or 5,5,5
beq 3b
b 1f
or 6,6,6
b 2b
bdnz 3b
1: or 1,1,1
#if 0
/* Test that if we have a larger else case the assembler spots it and