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runtime: Support broken makecontext on Solaris 8/9.

Browse Source 
From Rainer Orth.

From-SVN: r184289
This commit is contained in:
Ian Lance Taylor 2012-02-15 22:29:35 +00:00
parent a0367cc1ac
commit ca59d219fe
4 changed files with 41 additions and 0 deletions
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3
libgo/config.h.in
View File

@ -182,6 +182,9 @@
*/
#undef LT_OBJDIR
/* Define if makecontext expects top of stack in uc_stack. */
#undef MAKECONTEXT_STACK_TOP
/* Name of package */
#undef PACKAGE

17
libgo/configure vendored
View File

@ -14873,6 +14873,20 @@ $as_echo "#define HAVE_STRUCT_EXCEPTION 1" >>confdefs.h
fi
case "$target" in
sparc*-*-solaris2.[89]*)
libgo_cv_lib_makecontext_stack_top=yes
;;
*)
libgo_cv_lib_makecontext_stack_top=no
;;
esac
if test "$libgo_cv_lib_makecontext_stack_top" = "yes"; then
$as_echo "#define MAKECONTEXT_STACK_TOP 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether setcontext clobbers TLS variables" >&5
$as_echo_n "checking whether setcontext clobbers TLS variables... " >&6; }
if test "${libgo_cv_lib_setcontext_clobbers_tls+set}" = set; then :
@ -14974,6 +14988,9 @@ main ()
abort ();
c.uc_stack.ss_sp = stack;
#ifdef MAKECONTEXT_STACK_TOP
c.uc_stack.ss_sp += sizeof stack;
#endif
c.uc_stack.ss_flags = 0;
c.uc_stack.ss_size = sizeof stack;
c.uc_link = NULL;

18
libgo/configure.ac
View File

@ -611,6 +611,21 @@ if test "$libgo_has_struct_exception" = "yes"; then
[Define to 1 if <math.h> defines struct exception])
fi
dnl Check if makecontext expects the uc_stack member of ucontext to point
dnl to the top of the stack.
case "$target" in
sparc*-*-solaris2.[[89]]*)
libgo_cv_lib_makecontext_stack_top=yes
;;
*)
libgo_cv_lib_makecontext_stack_top=no
;;
esac
if test "$libgo_cv_lib_makecontext_stack_top" = "yes"; then
AC_DEFINE(MAKECONTEXT_STACK_TOP, 1,
[Define if makecontext expects top of stack in uc_stack.])
fi
dnl See whether setcontext changes the value of TLS variables.
AC_CACHE_CHECK([whether setcontext clobbers TLS variables],
[libgo_cv_lib_setcontext_clobbers_tls],
@ -667,6 +682,9 @@ main ()
abort ();
c.uc_stack.ss_sp = stack;
#ifdef MAKECONTEXT_STACK_TOP
c.uc_stack.ss_sp += sizeof stack;
#endif
c.uc_stack.ss_flags = 0;
c.uc_stack.ss_size = sizeof stack;
c.uc_link = NULL;

3
libgo/runtime/proc.c
View File

@ -1316,6 +1316,9 @@ __go_go(void (*fn)(void*), void* arg)
getcontext(&newg->context);
newg->context.uc_stack.ss_sp = sp;
#ifdef MAKECONTEXT_STACK_TOP
newg->context.uc_stack.ss_sp += spsize;
#endif
newg->context.uc_stack.ss_size = spsize;
makecontext(&newg->context, kickoff, 0);