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authorDavid S. Miller <davem@davemloft.net>2010-04-13 18:59:02 -0700
committerDavid S. Miller <davem@davemloft.net>2010-04-13 18:59:02 -0700
commit035df35d968323f6f463c8789553e8589efcbcd4 (patch)
tree6932aa9c85e37cf7d2e910a171b46ffacdb834a8 /arch/sparc/lib
parent2e2dc1d755cc5609d0c46d47f7d171318b3bffcd (diff)
downloadlinux-linaro-035df35d968323f6f463c8789553e8589efcbcd4.tar.gz
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/lib')
-rw-r--r--arch/sparc/lib/mcount.S8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S
index 3753e3c6e17..3ad6cbdc216 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