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authorStefan Liebler <stli@linux.ibm.com>2020-03-05 12:52:19 +0100
committerStefan Liebler <stli@linux.ibm.com>2020-03-05 12:52:19 +0100
commit13010976653675db489292dd4e253af2b5be2557 (patch)
treedd3a313e2b77d76aa3b3d2c676e20805dc4576d7 /math/test-math-iscanonical.cc
parentf801cf7bb146f9dd7b5e124e752c54194698e132 (diff)
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S390: Remove backchain-based fallback and use generic backtrace.c.
After recent discussions:
- "[PATCH] s390: Remove backchain-based fallback from backtrace"
  https://www.sourceware.org/ml/libc-alpha/2020-02/msg00287.html

- "Re: [PATCH 07/11] s390: Implement backtrace on top of <unwind-link.h>"
  https://www.sourceware.org/ml/libc-alpha/2020-02/msg00637.html

We've checked and decided to remove the backchain:
We don't know of any environments without libgcc. Thus the backchain
unwinder is not used. If somebody builds with -mbackchain and without
fasynchronous-unwind-tables and has libgcc installed, then the
libgcc unwinder is called but not the backchain-based fallback.

This step allows to get rid of the s390x specific backtrace.c files at all.
Furthermore the now used debug/backtrace.c version has some more
advantages:
- Free all resources if necessary. (libc_freeres_fn)
- Remove NULL address above _start.
- Check whether we make any progress while getting addresses.
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