Make truss work for CloudABI processes on aarch64.

This change copies over amd64-cloudabi64.c to aarch64-cloudabi.c and
adjusts it to fetch the proper registers on aarch64. To reduce the
amount of shared code, the errno conversion function is moved into a
separate source file.

Reviewed by:	jhb, andrew
Differential Revision:	https://reviews.freebsd.org/D4023

1 files changed, 90 insertions, 0 deletions

diff --git a/usr.bin/truss/aarch64-cloudabi64.c b/usr.bin/truss/aarch64-cloudabi64.c
new file mode 100644
index 000000000000..ad6afc260b5e
--- /dev/null
+++ b/usr.bin/truss/aarch64-cloudabi64.c
@@ -0,0 +1,90 @@
+/*-
+ * Copyright (c) 2015 Nuxi, https://nuxi.nl/
+ *
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/param.h>
+#include <sys/ptrace.h>
+
+#include <machine/armreg.h>
+
+#include <errno.h>
+#include <stdio.h>
+
+#include "cloudabi.h"
+#include "cloudabi64_syscalls.h"
+#include "truss.h"
+
+static int
+aarch64_cloudabi64_fetch_args(struct trussinfo *trussinfo, unsigned int narg)
+{
+	struct current_syscall *cs;
+	struct reg regs;
+	lwpid_t tid;
+	unsigned int i;
+
+	tid = trussinfo->curthread->tid;
+	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) == -1) {
+		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+		return (-1);
+	}
+
+	cs = &trussinfo->curthread->cs;
+	for (i = 0; i < narg && i < 8; i++)
+		cs->args[i] = regs.x[i];
+	return (0);
+}
+
+static int
+aarch64_cloudabi64_fetch_retval(struct trussinfo *trussinfo, long *retval,
+    int *errorp)
+{
+	struct reg regs;
+	lwpid_t tid;
+
+	tid = trussinfo->curthread->tid;
+	if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) == -1) {
+		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+		return (-1);
+	}
+
+	retval[0] = regs.x[0];
+	retval[1] = regs.x[1];
+	*errorp = (regs.spsr & PSR_C) != 0;
+	if (*errorp)
+		retval[0] = cloudabi_convert_errno(retval[0]);
+	return (0);
+}
+
+static struct procabi aarch64_cloudabi64 = {
+	"CloudABI ELF64",
+	syscallnames,
+	nitems(syscallnames),
+	aarch64_cloudabi64_fetch_args,
+	aarch64_cloudabi64_fetch_retval
+};
+
+PROCABI(aarch64_cloudabi64);