1. 17 6月, 2016 1 次提交
    • D
      arm64: kgdb: Match pstate size with gdbserver protocol · 0d15ef67
      Daniel Thompson 提交于
      Current versions of gdb do not interoperate cleanly with kgdb on arm64
      systems because gdb and kgdb do not use the same register description.
      This patch modifies kgdb to work with recent releases of gdb (>= 7.8.1).
      
      Compatibility with gdb (after the patch is applied) is as follows:
      
        gdb-7.6 and earlier  Ok
        gdb-7.7 series       Works if user provides custom target description
        gdb-7.8(.0)          Works if user provides custom target description
        gdb-7.8.1 and later  Ok
      
      When commit 44679a4f ("arm64: KGDB: Add step debugging support") was
      introduced it was paired with a gdb patch that made an incompatible
      change to the gdbserver protocol. This patch was eventually merged into
      the gdb sources:
      https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=a4d9ba85ec5597a6a556afe26b712e878374b9dd
      
      The change to the protocol was mostly made to simplify big-endian support
      inside the kernel gdb stub. Unfortunately the gdb project released
      gdb-7.7.x and gdb-7.8.0 before the protocol incompatibility was identified
      and reversed:
      https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=bdc144174bcb11e808b4e73089b850cf9620a7ee
      
      This leaves us in a position where kgdb still uses the no-longer-used
      protocol; gdb-7.8.1, which restored the original behaviour, was
      released on 2014-10-29.
      
      I don't believe it is possible to detect/correct the protocol
      incompatiblity which means the kernel must take a view about which
      version of the gdb remote protocol is "correct". This patch takes the
      view that the original/current version of the protocol is correct
      and that version found in gdb-7.7.x and gdb-7.8.0 is anomalous.
      Signed-off-by: NDaniel Thompson <daniel.thompson@linaro.org>
      Signed-off-by: NWill Deacon <will.deacon@arm.com>
      0d15ef67
  2. 05 3月, 2016 1 次提交
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