Re: [PATCH 05/12] powerpc/ftrace: ftrace_graph_caller() needs to save/restore toc
From: Balbir Singh <bsingharora@gmail.com>
Date: 2016-02-25 00:30:47
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lkml
On 25/02/16 01:28, Michael Ellerman wrote:
quoted hunk ↗ jump to hunk
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/kernel/entry_64.S | 8 ++++++++ 1 file changed, 8 insertions(+) Squash.diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 2a7313cfbc7d..9e77a2c8f218 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S@@ -1237,6 +1237,11 @@ _GLOBAL(ftrace_graph_caller) std r5, 64(r1) std r4, 56(r1) std r3, 48(r1) + + /* Save callee's TOC in the ABI compliant location */ + std r2, 24(r1)
R2_STACK_OFFSET for readability?
quoted hunk ↗ jump to hunk
+ ld r2, PACATOC(r13) /* get kernel TOC in r2 */ + mfctr r4 /* ftrace_caller has moved local addr here */ std r4, 40(r1) mflr r3 /* ftrace_caller has restored LR from stack */@@ -1262,6 +1267,9 @@ _GLOBAL(ftrace_graph_caller) ld r4, 56(r1) ld r3, 48(r1) + /* Restore callee's TOC */ + ld r2, 24(r1) + addi r1, r1, 112 mflr r0 std r0, LRSAVE(r1)
Reviewed-by: Balbir Singh <bsingharora@gmail.com> Balbir Singh.