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sparc64: Allocate sufficient stack space in ftrace stubs. 

128 bytes is sufficient for the register window save area, but the
calling conventions allow the callee to save up to 6 incoming argument
registers into the stack frame after the register window save area.

This means a minimal stack frame is 176 bytes (128 + (6 * 8)).

This fixes random crashes when using the function tracer.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-04-13 18:59:02 -07:00
parent 2e2dc1d755
commit 035df35d96
1 changed files with 4 additions and 4 deletions
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8
arch/sparc/lib/mcount.S
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@ -34,7 +34,7 @@ mcount:
cmp %g1, %g2
be,pn %icc, 1f
mov %i7, %g3
save %sp, -128, %sp
save %sp, -176, %sp
mov %g3, %o1
jmpl %g1, %o7
mov %i7, %o0
@ -56,7 +56,7 @@ mcount:
nop
5: mov %i7, %g2
mov %fp, %g3
save %sp, -128, %sp
save %sp, -176, %sp
mov %g2, %l0
ba,pt %xcc, ftrace_graph_caller
mov %g3, %l1
@ -85,7 +85,7 @@ ftrace_caller:
lduw [%g1 + %lo(function_trace_stop)], %g1
brnz,pn %g1, ftrace_stub
mov %fp, %g3
save %sp, -128, %sp
save %sp, -176, %sp
mov %g2, %o1
mov %g2, %l0
mov %g3, %l1
@ -120,7 +120,7 @@ ENTRY(ftrace_graph_caller)
END(ftrace_graph_caller)
ENTRY(return_to_handler)
save %sp, -128, %sp
save %sp, -176, %sp
call ftrace_return_to_handler
mov %fp, %o0
jmpl %o0 + 8, %g0