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authorTiejun Chen <tiejun.chen@windriver.com>2012-09-17 03:54:30 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-09-18 09:32:42 +0400
commita9c4e541ea9b22944da356f2a9258b4eddcc953b (patch)
tree3231ff5c12366200c5f5d48e654415e628a231f0 /arch/powerpc/lib
parentf0d1128fcb919a73941a54f80efab04fa3160dfe (diff)
downloadlinux-a9c4e541ea9b22944da356f2a9258b4eddcc953b.tar.xz
powerpc/kprobe: Complete kprobe and migrate exception frame
We can't emulate stwu since that may corrupt current exception stack. So we will have to do real store operation in the exception return code. Firstly we'll allocate a trampoline exception frame below the kprobed function stack and copy the current exception frame to the trampoline. Then we can do this real store operation to implement 'stwu', and reroute the trampoline frame to r1 to complete this exception migration. Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib')
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