sparc64: Give a stack frame to the ftrace call sites.
It's the only way we'll be able to implement the function graph tracer properly. A positive is that we no longer have to worry about the linker over-optimizing the tail call, since we don't use a tail call any more. Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -33,9 +33,13 @@ mcount:
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or %g2, %lo(ftrace_stub), %g2
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cmp %g1, %g2
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be,pn %icc, 1f
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mov %i7, %o1
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jmpl %g1, %g0
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mov %o7, %o0
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mov %i7, %g2
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save %sp, -128, %sp
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mov %g2, %o1
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jmpl %g1, %o7
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mov %i7, %o0
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ret
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restore
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/* not reached */
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1:
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#endif
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@ -57,21 +61,18 @@ ftrace_stub:
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.type ftrace_caller,#function
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ftrace_caller:
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sethi %hi(function_trace_stop), %g1
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mov %i7, %o1
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lduw [%g1 + %lo(function_trace_stop)], %g2
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brnz,pn %g2, ftrace_stub
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mov %o7, %o0
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mov %i7, %g2
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lduw [%g1 + %lo(function_trace_stop)], %g3
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brnz,pn %g3, ftrace_stub
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nop
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save %sp, -128, %sp
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mov %g2, %o1
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.globl ftrace_call
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ftrace_call:
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/* If the final kernel link ever turns on relaxation, we'll need
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* to do something about this tail call. Otherwise the linker
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* will rewrite the call into a branch and nop out the move
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* instruction.
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*/
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call ftrace_stub
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mov %o0, %o7
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retl
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nop
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mov %i7, %o0
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ret
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restore
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.size ftrace_call,.-ftrace_call
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.size ftrace_caller,.-ftrace_caller
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#endif
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