1 files changed, 95 insertions, 0 deletions
diff --git a/src/arch-arm.c b/src/arch-arm.c
new file mode 100644
index 0000000..c389815
--- /dev/null
+++ b/src/arch-arm.c
@@ -0,0 +1,95 @@
+/**
+ * Enhanced Seccomp ARM Specific Code
+ *
+ * Copyright (c) 2013 Red Hat <pmoore@redhat.com>
+ * Author: Paul Moore <paul@paul-moore.com>
+ */
+
+/*
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This 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 this library; if not, see <http://www.gnu.org/licenses>.
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <linux/audit.h>
+
+#include "arch.h"
+#include "arch-arm.h"
+#include "syscalls.h"
+
+#define __SCMP_NR_OABI_SYSCALL_BASE     0x900000
+#define __SCMP_ARM_NR_BASE              0x0f0000
+
+/* NOTE: we currently only support the ARM EABI, more info at the URL below:
+ *       -> http://wiki.embeddedarm.com/wiki/EABI_vs_OABI */
+#if 1
+#define __SCMP_NR_BASE                  0
+#else
+#define __SCMP_NR_BASE                  __SCMP_NR_OABI_SYSCALL_BASE
+#endif
+
+/**
+ * Resolve a syscall name to a number
+ * @param arch the architecture definition
+ * @param name the syscall name
+ *
+ * Resolve the given syscall name to the syscall number using the syscall table.
+ * Returns the syscall number on success, including negative pseudo syscall
+ * numbers; returns __NR_SCMP_ERROR on failure.
+ *
+ */
+int arm_syscall_resolve_name_munge(const struct arch_def *arch,
+				   const char *name)
+{
+	int sys;
+
+	/* NOTE: we don't want to modify the pseudo-syscall numbers */
+	sys = arch->syscall_resolve_name_raw(name);
+	if (sys == __NR_SCMP_ERROR || sys < 0)
+		return sys;
+
+	return (sys | __SCMP_NR_BASE);
+}
+
+/**
+ * Resolve a syscall number to a name
+ * @param arch the architecture definition
+ * @param num the syscall number
+ *
+ * Resolve the given syscall number to the syscall name using the syscall table.
+ * Returns a pointer to the syscall name string on success, including pseudo
+ * syscall names; returns NULL on failure.
+ *
+ */
+const char *arm_syscall_resolve_num_munge(const struct arch_def *arch, int num)
+{
+	/* NOTE: we don't want to modify the pseudo-syscall numbers */
+	if (num >= 0)
+		num &= ~__SCMP_NR_BASE;
+	return arch->syscall_resolve_num_raw(num);
+}
+
+ARCH_DEF(arm)
+
+const struct arch_def arch_def_arm = {
+	.token = SCMP_ARCH_ARM,
+	.token_bpf = AUDIT_ARCH_ARM,
+	.size = ARCH_SIZE_32,
+	.endian = ARCH_ENDIAN_LITTLE,
+	.syscall_resolve_name = arm_syscall_resolve_name_munge,
+	.syscall_resolve_name_raw = arm_syscall_resolve_name,
+	.syscall_resolve_num = arm_syscall_resolve_num_munge,
+	.syscall_resolve_num_raw = arm_syscall_resolve_num,
+	.syscall_rewrite = NULL,
+	.rule_add = NULL,
+};