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authorChris Metcalf <cmetcalf@ezchip.com>2015-07-21 12:04:52 -0400
committerChris Metcalf <cmetcalf@ezchip.com>2015-07-21 12:11:55 -0400
commit0ac4f1dab3e5778c79994a89111b4eb1d247ab12 (patch)
treebcc24bc8dd8a2c2b879e38a1c97234d9fcf420ba /login
parentf30d94a74a30b832354d4b87c23a4909ed24b929 (diff)
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tile: Fix BZ #18508 (makecontext yield infinite backtrace)
It turns out tile suffered from the same problem as S390.  However,
disabling CFI information for the __startcontext on tile was not
sufficient to fix the problem; I think the backtracer will just
blindly try to follow the link register (lr) in that case.

Instead, the change adds a cfi_undefined directive for "lr"
and then arranges to call __startcontext directly when the new
context starts, rather than just synthesizing a return to it.
In addition to being a bit easier now to understand the control
flow, this also allows the cfi_undefined directive to be placed in
a way that causes it to be in force at the address that the "lr"
from the called function points to.
Diffstat (limited to 'login')
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