diff options
| 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/kernel/head_fsl_booke.S | |
| parent | 113ec9ccc8049c3772f0eab46b62c5d6654c09f7 (diff) | |
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 'arch/powerpc/kernel/head_fsl_booke.S')
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 0f9642f36b49..dbf3b89e543c 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -79,7 +79,7 @@ _ENTRY(_start); mr r23,r3 mr r25,r4 - bl 0f + bcl 20,31,$+4 0: mflr r8 addis r3,r8,(is_second_reloc - 0b)@ha lwz r19,(is_second_reloc - 0b)@l(r3) @@ -1132,7 +1132,7 @@ _GLOBAL(switch_to_as1) bne 1b /* Get the tlb entry used by the current running code */ - bl 0f + bcl 20,31,$+4 0: mflr r4 tlbsx 0,r4 @@ -1166,7 +1166,7 @@ _GLOBAL(switch_to_as1) _GLOBAL(restore_to_as0) mflr r0 - bl 0f + bcl 20,31,$+4 0: mflr r9 addi r9,r9,1f - 0b |