unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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tracing, x86: function return tracer, fix assembly constraints

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fix:

 arch/x86/kernel/ftrace.c: Assembler messages:
 arch/x86/kernel/ftrace.c:140: Error: missing ')'
 arch/x86/kernel/ftrace.c:140: Error: junk `(%ebp))' after expression
 arch/x86/kernel/ftrace.c:141: Error: missing ')'
 arch/x86/kernel/ftrace.c:141: Error: junk `(%ebp))' after expression

the [parent_replaced] is used in an =rm fashion, so that constraint
is correct in isolation - but [parent_old] aliases register %0 and uses
it in an addressing mode that is only valid with registers - so change
the constraint from =rm to =r.

This fixes the build failure.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-11-11 11:18:14 +01:00
parent f1c4be5eda
commit 867f7fb3eb
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/ftrace.c
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@ -151,7 +151,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
" .long 2b, 3b\n"
".previous\n"
: [parent_replaced] "=rm" (parent), [old] "=r" (old),
: [parent_replaced] "=r" (parent), [old] "=r" (old),
[faulted] "=r" (faulted)
: [parent_old] "0" (parent), [return_hooker] "r" (return_hooker)
: "memory"