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authorWaldemar Brodkorb <wbx@openadk.org>2017-05-24 20:49:02 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-06-23 23:46:04 +0200
commit041cdc2769407c4d3869b218ad7ee7638e1c306e (patch)
tree1ea25250d74dcb230cf5feee99226fc080dbd678 /libc/sysdeps/linux/sparc64/swapcontext.c
parent58a5ba12bffad5916d9897c2870fc483f1db8282 (diff)
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.
Diffstat (limited to 'libc/sysdeps/linux/sparc64/swapcontext.c')
-rw-r--r--libc/sysdeps/linux/sparc64/swapcontext.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/swapcontext.c b/libc/sysdeps/linux/sparc64/swapcontext.c
new file mode 100644
index 000000000..f6dfc20ba
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/swapcontext.c
@@ -0,0 +1,46 @@
+/* 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 <ucontext.h>
+
+extern int __getcontext (ucontext_t *ucp);
+extern int __setcontext (const ucontext_t *ucp, int restoremask);
+
+int
+__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
+{
+ extern void __swapcontext_ret (void);
+ /* Save the current machine context to oucp. */
+ __getcontext (oucp);
+ /* Modify oucp to skip the __setcontext call on reactivation. */
+ oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret;
+ oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4;
+ /* Restore the machine context in ucp. */
+ __setcontext (ucp, 1);
+ return 0;
+}
+
+__asm__ (" \n\
+ .text \n\
+ .type __swapcontext_ret, #function \n\
+__swapcontext_ret: \n\
+ return %i7 + 8 \n\
+ clr %o0 \n\
+ .size __swapcontext_ret, .-__swapcontext_ret \n\
+ ");
+
+weak_alias (__swapcontext, swapcontext)