Make truss print CloudABI system call names.

This change adds the bits that are necessary to fetch system call
arguments and return values from trapframes for CloudABI. This allows us
to properly print system calls with the right name. We need to make sure
that we properly convert error numbers when system calls fail.

We still need to improve truss to pretty-print some of the system calls
that have flags.

usr.bin/truss/Makefile

@@ -58,6 +58,16 @@ fbsd32-syscalls.master: ${.CURDIR}/../../sys/compat/freebsd32/syscalls.master
 freebsd32_syscalls.h:	fbsd32-syscalls.master
 	/bin/sh ${.CURDIR}/../../sys/kern/makesyscalls.sh ${.ALLSRC} \
 		${.CURDIR}/fbsd32.conf
+
+SRCS+=	amd64-cloudabi64.c cloudabi64_syscalls.h
+CLEANFILES+=amd64cloudabi64-syscalls.master cloudabi64_syscalls.h
+
+amd64cloudabi64-syscalls.master: ${.CURDIR}/../../sys/compat/cloudabi64/syscalls.master
+	cat ${.ALLSRC} > ${.TARGET}
+
+cloudabi64_syscalls.h:	amd64cloudabi64-syscalls.master
+	/bin/sh ${.CURDIR}/../../sys/kern/makesyscalls.sh ${.ALLSRC} \
+		${.CURDIR}/amd64cloudabi64.conf
 .endif
 
 .if ${MACHINE_ARCH} == "powerpc64"

usr.bin/truss/amd64-cloudabi64.c

@@ -0,0 +1,113 @@
+/*-
+ * 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/psl.h>
+
+#include <errno.h>
+#include <stdio.h>
+
+#include "cloudabi64_syscalls.h"
+#include "truss.h"
+
+static int
+amd64_cloudabi64_fetch_args(struct trussinfo *trussinfo, unsigned int narg)
+{
+	struct current_syscall *cs;
+	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);
+	}
+
+	cs = &trussinfo->curthread->cs;
+	if (narg >= 1)
+		cs->args[0] = regs.r_rdi;
+	if (narg >= 2)
+		cs->args[1] = regs.r_rsi;
+	if (narg >= 3)
+		cs->args[2] = regs.r_rdx;
+	if (narg >= 4)
+		cs->args[3] = regs.r_rcx;
+	if (narg >= 5)
+		cs->args[4] = regs.r_r8;
+	if (narg >= 6)
+		cs->args[5] = regs.r_r9;
+	return (0);
+}
+
+static const int cloudabi_errno_table[] = {
+	0, E2BIG, EACCES, EADDRINUSE, EADDRNOTAVAIL, EAFNOSUPPORT,
+	EAGAIN, EALREADY, EBADF, EBADMSG, EBUSY, ECANCELED, ECHILD,
+	ECONNABORTED, ECONNREFUSED, ECONNRESET, EDEADLK, EDESTADDRREQ,
+	EDOM, EDQUOT, EEXIST, EFAULT, EFBIG, EHOSTUNREACH, EIDRM,
+	EILSEQ, EINPROGRESS, EINTR, EINVAL, EIO, EISCONN, EISDIR, ELOOP,
+	EMFILE, EMLINK, EMSGSIZE, EMULTIHOP, ENAMETOOLONG, ENETDOWN,
+	ENETRESET, ENETUNREACH, ENFILE, ENOBUFS, ENODEV, ENOENT,
+	ENOEXEC, ENOLCK, ENOLINK, ENOMEM, ENOMSG, ENOPROTOOPT, ENOSPC,
+	ENOSYS, ENOTCONN, ENOTDIR, ENOTEMPTY, ENOTRECOVERABLE, ENOTSOCK,
+	ENOTSUP, ENOTTY, ENXIO, EOVERFLOW, EOWNERDEAD, EPERM, EPIPE,
+	EPROTO, EPROTONOSUPPORT, EPROTOTYPE, ERANGE, EROFS, ESPIPE,
+	ESRCH, ESTALE, ETIMEDOUT, ETXTBSY, EXDEV, ENOTCAPABLE,
+};
+
+static int
+amd64_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.r_rax;
+	retval[1] = regs.r_rdx;
+	*errorp = (regs.r_rflags & PSL_C) != 0;
+	if (*errorp && *retval >= 0 && *retval < nitems(cloudabi_errno_table))
+		*retval = cloudabi_errno_table[*retval];
+	return (0);
+}
+
+static struct procabi amd64_cloudabi64 = {
+	"CloudABI ELF64",
+	cloudabi64_syscallnames,
+	nitems(cloudabi64_syscallnames),
+	amd64_cloudabi64_fetch_args,
+	amd64_cloudabi64_fetch_retval
+};
+
+PROCABI(amd64_cloudabi64);

usr.bin/truss/amd64cloudabi64.conf

@@ -0,0 +1,13 @@
+# $FreeBSD$
+
+sysnames="cloudabi64_syscalls.h"
+sysproto="/dev/null"
+sysproto_h="/dev/null"
+syshdr="/dev/null"
+sysmk="/dev/null"
+syssw="/dev/null"
+syshide="/dev/null"
+syscallprefix="SYS_"
+switchname="sysent"
+namesname="cloudabi64_syscallnames"
+systrace="/dev/null"