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8286711: AArch64: serviceability agent tests fail with PAC enabled #8814

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wants to merge 1 commit into from
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8286711: AArch64: serviceability agent tests fail with PAC enabled #8814

wants to merge 1 commit into from

Commits on May 20, 2022

  1. 8286711: AArch64: serviceability agent tests fail with PAC enabled 

    When the VM is run with `-XX:UseBranchProtection=pac-ret` on a supported
CPU, the upper bits of the saved link register contain a "pointer
authentication code" which must be checked and removed by a special
instruction before a function returns.  The serviceability agent is
unaware of this and so sees garbled PC values when walking the stack.
This patch just masks out the PAC bits from the sender PC after reading
it from the stack frame.
    @nick-arm
    nick-arm committed May 20, 2022
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