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Use breakpad_getcontext on all Linux platforms missing getcontext

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getcontext is also not available on musl libc, so generalize
breakpad_getcontext so it can be used as a fallback for non-Android
platforms as well.

On x86_64 and i386, ucontext_t uses an Android-specific offset for
storage of FP registers, since its sigset_t differs in size. So,
make the definition of MCONTEXT_FPREGS_MEM and UCONTEXT_FPREGS_MEM_OFFSET
conditional on whether we are building for Android.

On glibc and musl, signal.h and asm/sigcontext.h can't be included
together, so in breakpad_context_unittest.cc, only compare the libc
and kernel _fpstate when on Android.

Bug: google-breakpad:631
Change-Id: If81d73c4101bae946e9a3655b8d1c40a34ab6c38
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2102135
Reviewed-by: Mike Frysinger <vapier@chromium.org>
This commit is contained in:
Michael Forney 2020-03-16 12:56:56 -07:00 • committed by Mike Frysinger
parent 02b7be4065
commit e780d58fd7
14 changed files with 124 additions and 87 deletions
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3
configure.ac
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@ -73,7 +73,8 @@ AC_HEADER_STDC
AC_SYS_LARGEFILE
AX_PTHREAD
AC_CHECK_HEADERS([a.out.h sys/random.h])
AC_CHECK_FUNCS([arc4random getrandom])
AC_CHECK_FUNCS([arc4random getcontext getrandom])
AM_CONDITIONAL([HAVE_GETCONTEXT], [test "x$ac_cv_func_getcontext" = xyes])
AX_CXX_COMPILE_STDCXX(11, noext, mandatory)