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| author | Sven Schnelle <svens@linux.ibm.com> | 2023-06-29 12:02:19 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2023-07-24 12:12:22 +0200 |
| commit | 1256e70a082ad855efe351146dfa39207d5e3e70 (patch) | |
| tree | a69c5b676f9373fbf896ba4826e165bdc9d99448 /arch/s390/kernel/mcount.S | |
| parent | 3325b4d85799957aa53514e69bed5c9df7771caf (diff) | |
s390/ftrace: enable HAVE_FUNCTION_GRAPH_RETVAL
Add support for tracing return values in the function graph tracer.
This requires return_to_handler() to record gpr2 and the frame pointer
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/mcount.S')
| -rw-r--r-- | arch/s390/kernel/mcount.S | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S index dbece2803c50..fd27ff9f2cf3 100644 --- a/arch/s390/kernel/mcount.S +++ b/arch/s390/kernel/mcount.S @@ -128,10 +128,14 @@ SYM_CODE_END(ftrace_common) SYM_FUNC_START(return_to_handler) stmg %r2,%r5,32(%r15) lgr %r1,%r15 - aghi %r15,-STACK_FRAME_OVERHEAD + aghi %r15,-(STACK_FRAME_OVERHEAD+__FGRAPH_RET_SIZE) stg %r1,__SF_BACKCHAIN(%r15) + aghik %r3,%r15,STACK_FRAME_OVERHEAD + stg %r1,__FGRAPH_RET_FP(%r3) + stg %r2,__FGRAPH_RET_GPR2(%r3) + lgr %r2,%r3 brasl %r14,ftrace_return_to_handler - aghi %r15,STACK_FRAME_OVERHEAD + aghi %r15,STACK_FRAME_OVERHEAD+__FGRAPH_RET_SIZE lgr %r14,%r2 lmg %r2,%r5,32(%r15) BR_EX %r14 |