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-rw-r--r--arch/sh/kernel/signal_32.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index b5afbec1db5..6010750c90b 100644
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -41,6 +41,16 @@ struct fdpic_func_descriptor {
};
/*
+ * The following define adds a 64 byte gap between the signal
+ * stack frame and previous contents of the stack. This allows
+ * frame unwinding in a function epilogue but only if a frame
+ * pointer is used in the function. This is necessary because
+ * current gcc compilers (<4.3) do not generate unwind info on
+ * SH for function epilogues.
+ */
+#define UNWINDGUARD 64
+
+/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int
@@ -327,7 +337,7 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
sp = current->sas_ss_sp + current->sas_ss_size;
}
- return (void __user *)((sp - frame_size) & -8ul);
+ return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul);
}
/* These symbols are defined with the addresses in the vsyscall page.