On 1/29/2014 3:44 PM, Helge Deller wrote:
Hi Guy,
On 01/29/2014 08:59 PM, Guy Martin wrote:
It seems that the ftrace subsystem has not been maintained for a few
years.
Yes.
So far I have the diff at the bottom that attempts to fix it bug there
is still an issue while linking :
I'm not sure I tested 64bit at that time.
arch/parisc/kernel/built-in.o: In function `return_to_handler':
(.text+0xb2a8): undefined reference to `ftrace_return_to_handler'
hppa64-linux-ld: arch/parisc/kernel/built-in.o(.text+0xllx): cannot
reach (null)
arch/parisc/kernel/built-in.o: In function `return_to_handler':
(.text+0xb2a8): relocation truncated to fit: R_PARISC_PCREL17F against
undefined symbol `ftrace_return_to_handler'
make: *** [vmlinux] Error 1
I'm not sure how this can be fixed, the problems comes from the
assembly in entry.S, it uses a 'b' to jump to ftrace_return_to_handler.
I guess 'be' needs to be used but not sure how that'd works with the
linker.
Can you try
BL ftrace_return_to_handler, %r0
(I'm not good in hppa assembly - as you can see if you take a look at this assembly code section :-)).
BL might not reach on PA 1.1. The PA 2.0 b,l instruction is only "long"
when the link
register is %rp and it is used for the return_trampoline.
I would say replace "b" with the following as it will always reach target:
load32 ftrace_return_to_handler, %r20
bv %r0(%r20)
%r1 is another register alternative.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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