Implement signalcontext(). Needed by libpthread (aka libkse).

2 files changed, 123 insertions, 1 deletions

diff --git a/lib/libc/ia64/gen/Makefile.inc b/lib/libc/ia64/gen/Makefile.inc
index 3682068..91d54fd 100644
--- a/lib/libc/ia64/gen/Makefile.inc
+++ b/lib/libc/ia64/gen/Makefile.inc
@@ -3,7 +3,8 @@
 SRCS+=	__divdf3.S __divdi3.S __divsf3.S __divsi3.S __moddi3.S __modsi3.S \
 	__udivdi3.S __udivsi3.S __umoddi3.S __umodsi3.S _setjmp.S fabs.S \
 	fpgetmask.c fpgetround.c fpsetmask.c fpsetround.c frexp.c infinity.c \
-	isinf.c ldexp.c makecontext.c modf.c setjmp.S sigsetjmp.S
+	isinf.c ldexp.c makecontext.c modf.c setjmp.S signalcontext.c \
+	sigsetjmp.S
 
 # The following may go away if function _Unwind_FindTableEntry()
 # will be part of GCC.
diff --git a/lib/libc/ia64/gen/signalcontext.c b/lib/libc/ia64/gen/signalcontext.c
new file mode 100644
index 0000000..6d09746
--- /dev/null
+++ b/lib/libc/ia64/gen/signalcontext.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2003 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/ucontext.h>
+#include <machine/fpu.h>
+#include <signal.h>
+#include <stdio.h>
+#include <strings.h>
+
+struct fdesc {
+	uint64_t ip;
+	uint64_t gp;
+};
+
+typedef void (*handler_t)(uint64_t, uint64_t, uint64_t);
+
+static __inline uint64_t *
+spill(uint64_t *bsp, uint64_t arg)
+{
+	*bsp++ = arg;
+	if (((intptr_t)bsp & 0x1ff) == 0x1f8)
+		*bsp++ = 0;
+	return (bsp);
+}
+
+static void
+ctx_wrapper(ucontext_t *ucp, handler_t func, uint64_t *args)
+{
+
+	(*func)(args[0], args[1], args[2]);
+	if (ucp->uc_link == NULL)
+		exit(0);
+	setcontext((const ucontext_t *)ucp->uc_link);
+	/* should never get here */
+	abort();
+	/* NOTREACHED */
+}
+
+__weak_reference(__signalcontext, signalcontext);
+
+int
+__signalcontext(ucontext_t *ucp, int sig, __sighandler_t *func)
+{
+	uint64_t *args, *bsp;
+	siginfo_t *sig_si;
+	ucontext_t *sig_uc;
+	uint64_t sp;
+
+	/* Bail out if we don't have a valid ucontext pointer. */
+	if (ucp == NULL)
+		abort();
+
+	/*
+	 * Build a signal frame and copy the arguments of signal handler
+	 * 'func' onto the (memory) stack. We only need 3 arguments, but
+	 * we create room for 4 so that we are 16-byte aligned.
+	 */
+	sp = (ucp->uc_mcontext.mc_special.sp - sizeof(ucontext_t)) & ~15UL;
+	sig_uc = (ucontext_t*)sp;
+	bcopy(ucp, sig_uc, sizeof(*sig_uc));
+	sp = (sp - sizeof(siginfo_t)) & ~15UL;
+	sig_si = (siginfo_t*)sp;
+	bzero(sig_si, sizeof(*sig_si));
+	sig_si->si_signo = sig;
+	sp -= 4 * sizeof(uint64_t);
+	args = (uint64_t*)sp;
+	args[0] = sig;
+	args[1] = (intptr_t)sig_si;
+	args[2] = (intptr_t)sig_uc;
+
+	/*
+	 * Push (spill) the arguments of the context wrapper onto the register
+	 * stack. They get loaded by the RSE on a context switch.
+	 */
+	bsp = (uint64_t*)ucp->uc_mcontext.mc_special.bspstore;
+	bsp = spill(bsp, (intptr_t)ucp);
+	bsp = spill(bsp, (intptr_t)func);
+	bsp = spill(bsp, (intptr_t)args);
+
+	/*
+	 * Setup the ucontext of the signal handler.
+	 */
+	memset(&ucp->uc_mcontext, 0, sizeof(ucp->uc_mcontext));
+	ucp->uc_link = sig_uc;
+	sigdelset(&ucp->uc_sigmask, sig);
+	ucp->uc_mcontext.mc_special.sp = (intptr_t)args - 16;
+	ucp->uc_mcontext.mc_special.bspstore = (intptr_t)bsp;
+	ucp->uc_mcontext.mc_special.pfs = (3 << 7) | 3;
+	ucp->uc_mcontext.mc_special.rsc = 0xf;
+	ucp->uc_mcontext.mc_special.rp = ((struct fdesc*)ctx_wrapper)->ip;
+	ucp->uc_mcontext.mc_special.gp = ((struct fdesc*)ctx_wrapper)->gp;
+	ucp->uc_mcontext.mc_special.fpsr = IA64_FPSR_DEFAULT;
+	return (0);
+}