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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-08-24 07:56:26 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-08-25 13:35:47 +1000 |
| commit | f5007dbf4da729baa850b33a64dc3cc53757bdf8 (patch) | |
| tree | 9e0faa1eca3f840f7e51dc50016697f26585acd2 /arch/powerpc/mm/nohash/tlb_low.S | |
| parent | powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread (diff) | |
| download | linux-dev-f5007dbf4da729baa850b33a64dc3cc53757bdf8.tar.xz linux-dev-f5007dbf4da729baa850b33a64dc3cc53757bdf8.zip | |
powerpc/booke: Avoid link stack corruption in several places
Use bcl 20,31,+4 instead of bl in order to preserve link stack.
See commit c974809a26a1 ("powerpc/vdso: Avoid link stack corruption
in __get_datapage()") for details.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e9fbc285eceb720e6c0e032ef47fe8b05f669b48.1629791751.git.christophe.leroy@csgroup.eu
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/mm/nohash/tlb_low.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/nohash/tlb_low.S b/arch/powerpc/mm/nohash/tlb_low.S index 4613bf8e9aae..5add4a51e51f 100644 --- a/arch/powerpc/mm/nohash/tlb_low.S +++ b/arch/powerpc/mm/nohash/tlb_low.S @@ -199,7 +199,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_476_DD2) * Touch enough instruction cache lines to ensure cache hits */ 1: mflr r9 - bl 2f + bcl 20,31,$+4 2: mflr r6 li r7,32 PPC_ICBT(0,R6,R7) /* touch next cache line */ @@ -414,7 +414,7 @@ _GLOBAL(loadcam_multi) * Set up temporary TLB entry that is the same as what we're * running from, but in AS=1. */ - bl 1f + bcl 20,31,$+4 1: mflr r6 tlbsx 0,r8 mfspr r6,SPRN_MAS1 |