diff options
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/Makefile | 2 | ||||
| -rw-r--r-- | stdlib/tst-makecontext.c | 41 |
2 files changed, 42 insertions, 1 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile index 3300dd2142..7fc5a807fa 100644 --- a/stdlib/Makefile +++ b/stdlib/Makefile @@ -164,3 +164,5 @@ $(objpfx)tst-setcontext3.out: tst-setcontext3.sh $(objpfx)tst-setcontext3 '$(run-program-env)' '$(test-program-prefix-after-env)' \ $(common-objpfx)stdlib/; \ $(evaluate-test) + +$(objpfx)tst-makecontext: $(libdl) diff --git a/stdlib/tst-makecontext.c b/stdlib/tst-makecontext.c index 29a588e588..8170e8aeed 100644 --- a/stdlib/tst-makecontext.c +++ b/stdlib/tst-makecontext.c @@ -19,23 +19,62 @@ #include <stdlib.h> #include <stdio.h> #include <ucontext.h> +#include <assert.h> +#include <unwind.h> +#include <dlfcn.h> +#include <gnu/lib-names.h> ucontext_t ucp; -char st1[8192]; +char st1[16384]; __thread int thr; int somevar = -76; long othervar = -78L; +struct trace_arg +{ + int cnt, size; +}; + +static _Unwind_Reason_Code +backtrace_helper (struct _Unwind_Context *ctx, void *a) +{ + struct trace_arg *arg = a; + if (++arg->cnt == arg->size) + return _URC_END_OF_STACK; + return _URC_NO_REASON; +} + void cf (int i) { + struct trace_arg arg = { .size = 100, .cnt = -1 }; + void *handle; + _Unwind_Reason_Code (*unwind_backtrace) (_Unwind_Trace_Fn, void *); + if (i != othervar || thr != 94) { printf ("i %d thr %d\n", i, thr); exit (1); } + /* Test if callback function of _Unwind_Backtrace is not called infinitely + times. See Bug 18508 or gcc bug "Bug 66303 - runtime.Caller() returns + infinitely deep stack frames on s390x.". + The go runtime calls backtrace_full() in + <gcc-src>/libbacktrace/backtrace.c, which uses _Unwind_Backtrace(). */ + handle = dlopen (LIBGCC_S_SO, RTLD_LAZY); + if (handle != NULL) + { + unwind_backtrace = dlsym (handle, "_Unwind_Backtrace"); + if (unwind_backtrace != NULL) + { + unwind_backtrace (backtrace_helper, &arg); + assert (arg.cnt != -1 && arg.cnt < 100); + } + dlclose (handle); + } + /* Since uc_link below has been set to NULL, setcontext is supposed to terminate the process normally after this function returns. */ } |