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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+4
-4
+4
-4
arch/sparc/lib/mcount.S
+4
-4
arch/sparc/lib/mcount.S
···
34
34
cmp %g1, %g2
35
35
be,pn %icc, 1f
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36
mov %i7, %g3
37
-
save %sp, -128, %sp
37
+
save %sp, -176, %sp
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mov %g3, %o1
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jmpl %g1, %o7
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mov %i7, %o0
···
56
56
nop
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5: mov %i7, %g2
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mov %fp, %g3
59
-
save %sp, -128, %sp
59
+
save %sp, -176, %sp
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mov %g2, %l0
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ba,pt %xcc, ftrace_graph_caller
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mov %g3, %l1
···
85
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lduw [%g1 + %lo(function_trace_stop)], %g1
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brnz,pn %g1, ftrace_stub
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mov %fp, %g3
88
-
save %sp, -128, %sp
88
+
save %sp, -176, %sp
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mov %g2, %o1
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mov %g2, %l0
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mov %g3, %l1
···
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120
END(ftrace_graph_caller)
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ENTRY(return_to_handler)
123
-
save %sp, -128, %sp
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+
save %sp, -176, %sp
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call ftrace_return_to_handler
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mov %fp, %o0
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jmpl %o0 + 8, %g0