From 75e479a8b5afc311eafb7312a2f877166309d374 Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Thu, 27 Dec 2018 03:13:11 +0000 Subject: [PATCH] runtime: on ARM32 EABI, don't get LSDA if compact model is used On ARM32 EABI, when the "compact" unwinding model is used, it does not have standard LSDA and _Unwind_GetLanguageSpecificData will not return data that is parseable by us. Check this conditon before calling _Unwind_GetLanguageSpecificData. Fix ARM32 build. Reviewed-on: https://go-review.googlesource.com/c/155758 From-SVN: r267428 --- gcc/go/gofrontend/MERGE | 2 +- libgo/runtime/go-unwind.c | 11 +++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE index 8b1ca48..2bcf536 100644 --- a/gcc/go/gofrontend/MERGE +++ b/gcc/go/gofrontend/MERGE @@ -1,4 +1,4 @@ -16a48dbc1c69075321b388d235651b59abcb58ce +785414705628bf9d1279a8042e1886440424aade The first line of this file holds the git revision number of the last merge done from the gofrontend repository. diff --git a/libgo/runtime/go-unwind.c b/libgo/runtime/go-unwind.c index f4bbfb6..388d7c7 100644 --- a/libgo/runtime/go-unwind.c +++ b/libgo/runtime/go-unwind.c @@ -646,6 +646,17 @@ findstackmaps (struct _Unwind_Context *context, _Unwind_Ptr *ip, _Unwind_Ptr *sp _sleb128_t index; int size; +#ifdef __ARM_EABI_UNWINDER__ + { + _Unwind_Control_Block *ucbp; + ucbp = (_Unwind_Control_Block *) _Unwind_GetGR (context, 12); + if (*ucbp->pr_cache.ehtp & (1u << 31)) + // The "compact" model is used, with one of the predefined + // personality functions. It doesn't have standard LSDA. + return NOTFOUND_OK; + } +#endif + language_specific_data = (const unsigned char *) _Unwind_GetLanguageSpecificData (context); -- 2.7.4