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| author | David S. Miller <davem@davemloft.net> | 2010-04-14 05:59:02 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-14 05:59:02 +0400 |
| commit | 035df35d968323f6f463c8789553e8589efcbcd4 (patch) | |
| tree | 6932aa9c85e37cf7d2e910a171b46ffacdb834a8 /arch/sparc | |
| parent | 2e2dc1d755cc5609d0c46d47f7d171318b3bffcd (diff) | |
| download | linux-035df35d968323f6f463c8789553e8589efcbcd4.tar.xz | |
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/lib/mcount.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S index 3753e3c6e176..3ad6cbdc2163 100644 --- a/arch/sparc/lib/mcount.S +++ b/arch/sparc/lib/mcount.S @@ -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 |