sparc64: add basic support

No NPTL, no LDSO support.
Bootup with Busybox Ash in Qemu working.
Testuite shows only two failures, but mksh continue/break
support doesn't work.

1 files changed, 56 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/sparc64/makecontext.c b/libc/sysdeps/linux/sparc64/makecontext.c
new file mode 100644
index 000000000..3750f012c
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/makecontext.c
@@ -0,0 +1,56 @@
+/* Copyright (C) 2001-2017 Free Software Foundation, Inc.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+extern void __start_context (struct ucontext *ucp);
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+  extern void __makecontext_ret (void);
+  unsigned long *sp, *topsp;
+  va_list ap;
+  int i;
+
+  sp = (unsigned long *) ((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+  sp -= (argc > 6 ? argc : 6) + 32;
+  sp = (unsigned long *) (((long) sp) & -16L);
+  topsp = sp + (argc > 6 ? argc : 6) + 16;
+
+  ucp->uc_mcontext.mc_gregs[MC_PC] = (long) func;
+  ucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) func) + 4;
+  ucp->uc_mcontext.mc_gregs[MC_O6] = ((long) sp) - 0x7ff;
+  ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __start_context) - 8;
+  ucp->uc_mcontext.mc_fp = ((long) topsp) - 0x7ff;
+  ucp->uc_mcontext.mc_i7 = 0;
+  topsp[14] = 0;
+  topsp[15] = 0;
+  sp[8] = (long) ucp->uc_link;
+  va_start (ap, argc);
+  for (i = 0; i < argc; ++i)
+    if (i < 6)
+      ucp->uc_mcontext.mc_gregs[MC_O0 + i] = va_arg (ap, long);
+    else
+      sp[16 + i] = va_arg (ap, long);
+  va_end (ap);
+}
+
+weak_alias (__makecontext, makecontext)