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author | Paul Mundt <lethal@linux-sh.org> | 2009-10-26 02:48:18 +0100 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2009-10-26 02:48:18 +0100 |
commit | 6253195b671b98a4e5da5d39c2df9f8f257bcea1 (patch) | |
tree | 3b7ca1d8ef5d9c50a77abf1d1cf5b2b5aa243284 /arch/sh/kernel/dwarf.c | |
parent | Merge branch 'sh/sdhi-mfd' (diff) | |
parent | sh: Check for return_to_handler when unwinding the stack (diff) | |
download | linux-6253195b671b98a4e5da5d39c2df9f8f257bcea1.tar.xz linux-6253195b671b98a4e5da5d39c2df9f8f257bcea1.zip |
Merge branch 'sh/stable-updates'
Conflicts:
arch/sh/kernel/dwarf.c
Diffstat (limited to 'arch/sh/kernel/dwarf.c')
-rw-r--r-- | arch/sh/kernel/dwarf.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/sh/kernel/dwarf.c b/arch/sh/kernel/dwarf.c index 4d8c7bd149df..6c9d0c10f2be 100644 --- a/arch/sh/kernel/dwarf.c +++ b/arch/sh/kernel/dwarf.c @@ -21,6 +21,7 @@ #include <linux/mempool.h> #include <linux/mm.h> #include <linux/elf.h> +#include <linux/ftrace.h> #include <asm/dwarf.h> #include <asm/unwinder.h> #include <asm/sections.h> @@ -569,6 +570,27 @@ struct dwarf_frame * dwarf_unwind_stack(unsigned long pc, if (!pc && !prev) pc = (unsigned long)current_text_addr(); +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + /* + * If our stack has been patched by the function graph tracer + * then we might see the address of return_to_handler() where we + * expected to find the real return address. + */ + if (pc == (unsigned long)&return_to_handler) { + int index = current->curr_ret_stack; + + /* + * We currently have no way of tracking how many + * return_to_handler()'s we've seen. If there is more + * than one patched return address on our stack, + * complain loudly. + */ + WARN_ON(index > 0); + + pc = current->ret_stack[index].ret; + } +#endif + frame = mempool_alloc(dwarf_frame_pool, GFP_ATOMIC); if (!frame) { printk(KERN_ERR "Unable to allocate a dwarf frame\n"); |