Commit 46210c44 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

s390: have unique symbol for __switch_to address

After linking there are several symbols for the same address that the
__switch_to symbol points to. E.g.:

000000000089b9c0 T __kprobes_text_start
000000000089b9c0 T __lock_text_end
000000000089b9c0 T __lock_text_start
000000000089b9c0 T __sched_text_end
000000000089b9c0 T __switch_to

When disassembling with "objdump -d" this results in a missing
__switch_to function. It would be named __kprobes_text_start
instead. To unconfuse objdump add a nop in front of the kprobes text
section. That way __switch_to appears again.

Obviously this solution is sort of a hack, since it also depends on
link order if this works or not. However it is the best I can come up
with for now.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 10f4954a
...@@ -163,6 +163,16 @@ _PIF_WORK = (_PIF_PER_TRAP) ...@@ -163,6 +163,16 @@ _PIF_WORK = (_PIF_PER_TRAP)
.endm .endm
.section .kprobes.text, "ax" .section .kprobes.text, "ax"
.Ldummy:
/*
* This nop exists only in order to avoid that __switch_to starts at
* the beginning of the kprobes text section. In that case we would
* have several symbols at the same address. E.g. objdump would take
* an arbitrary symbol name when disassembling this code.
* With the added nop in between the __switch_to symbol is unique
* again.
*/
nop 0
/* /*
* Scheduler resume function, called by switch_to * Scheduler resume function, called by switch_to
......
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