diff --git a/bsd-user/aarch64/signal.c b/bsd-user/aarch64/signal.c
new file mode 100644
index 00000000000..98861f9ab3b
--- /dev/null
+++ b/bsd-user/aarch64/signal.c
@@ -0,0 +1,53 @@
+/*
+ * ARM AArch64 specific signal definitions for bsd-user
+ *
+ * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * 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 "qemu/osdep.h"
+
+#include "qemu.h"
+
+/*
+ * Compare to sendsig() in sys/arm64/arm64/machdep.c
+ * Assumes that target stack frame memory is locked.
+ */
+abi_long set_sigtramp_args(CPUARMState *regs, int sig,
+                           struct target_sigframe *frame,
+                           abi_ulong frame_addr,
+                           struct target_sigaction *ka)
+{
+    /*
+     * Arguments to signal handler:
+     *  x0 = signal number
+     *  x1 = siginfo pointer
+     *  x2 = ucontext pointer
+     *  pc/elr = signal handler pointer
+     *  sp = sigframe struct pointer
+     *  lr = sigtramp at base of user stack
+     */
+
+    regs->xregs[0] = sig;
+    regs->xregs[1] = frame_addr +
+        offsetof(struct target_sigframe, sf_si);
+    regs->xregs[2] = frame_addr +
+        offsetof(struct target_sigframe, sf_uc);
+
+    regs->pc = ka->_sa_handler;
+    regs->xregs[TARGET_REG_SP] = frame_addr;
+    regs->xregs[TARGET_REG_LR] = TARGET_PS_STRINGS - TARGET_SZSIGCODE;
+
+    return 0;
+}
diff --git a/bsd-user/aarch64/target_arch_signal.h b/bsd-user/aarch64/target_arch_signal.h
new file mode 100644
index 00000000000..df171733166
--- /dev/null
+++ b/bsd-user/aarch64/target_arch_signal.h
@@ -0,0 +1,80 @@
+/*
+ * ARM AArch64 specific signal definitions for bsd-user
+ *
+ * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * 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/>.
+ */
+
+#ifndef TARGET_ARCH_SIGNAL_H
+#define TARGET_ARCH_SIGNAL_H
+
+#include "cpu.h"
+
+#define TARGET_REG_X0   0
+#define TARGET_REG_X30  30
+#define TARGET_REG_X31  31
+#define TARGET_REG_LR   TARGET_REG_X30
+#define TARGET_REG_SP   TARGET_REG_X31
+
+#define TARGET_INSN_SIZE    4       /* arm64 instruction size */
+
+/* Size of the signal trampolin code. See _sigtramp(). */
+#define TARGET_SZSIGCODE    ((abi_ulong)(9 * TARGET_INSN_SIZE))
+
+/* compare to sys/arm64/include/_limits.h */
+#define TARGET_MINSIGSTKSZ  (1024 * 4)                  /* min sig stack size */
+#define TARGET_SIGSTKSZ     (TARGET_MINSIGSTKSZ + 32768)  /* recommended size */
+
+/* struct __mcontext in sys/arm64/include/ucontext.h */
+
+struct target_gpregs {
+    uint64_t    gp_x[30];
+    uint64_t    gp_lr;
+    uint64_t    gp_sp;
+    uint64_t    gp_elr;
+    uint32_t    gp_spsr;
+    uint32_t    gp_pad;
+};
+
+struct target_fpregs {
+    __uint128_t fp_q[32];
+    uint32_t    fp_sr;
+    uint32_t    fp_cr;
+    uint32_t    fp_flags;
+    uint32_t    fp_pad;
+};
+
+struct target__mcontext {
+    struct target_gpregs mc_gpregs;
+    struct target_fpregs mc_fpregs;
+    uint32_t    mc_flags;
+#define TARGET_MC_FP_VALID  0x1
+    uint32_t    mc_pad;
+    uint64_t    mc_spare[8];
+};
+
+typedef struct target__mcontext target_mcontext_t;
+
+#define TARGET_MCONTEXT_SIZE 880
+#define TARGET_UCONTEXT_SIZE 960
+
+#include "target_os_ucontext.h"
+
+struct target_sigframe {
+    target_siginfo_t    sf_si;  /* saved siginfo */
+    target_ucontext_t   sf_uc;  /* saved ucontext */
+};
+
+#endif /* TARGET_ARCH_SIGNAL_H */
diff --git a/bsd-user/aarch64/target_arch_sigtramp.h b/bsd-user/aarch64/target_arch_sigtramp.h
new file mode 100644
index 00000000000..8cdd33b621d
--- /dev/null
+++ b/bsd-user/aarch64/target_arch_sigtramp.h
@@ -0,0 +1,48 @@
+/*
+ * ARM AArch64 sigcode for bsd-user
+ *
+ * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
+ *
+ * This 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 of the License, or (at your option) any later version.
+ *
+ * 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/>.
+ */
+
+#ifndef TARGET_ARCH_SIGTRAMP_H
+#define TARGET_ARCH_SIGTRAMP_H
+
+/* Compare to ENTRY(sigcode) in arm64/arm64/locore.S */
+static inline abi_long setup_sigtramp(abi_ulong offset, unsigned sigf_uc,
+        unsigned sys_sigreturn)
+{
+    int i;
+    uint32_t sys_exit = TARGET_FREEBSD_NR_exit;
+
+    uint32_t sigtramp_code[] = {
+    /* 1 */ 0x910003e0,                 /* mov x0, sp */
+    /* 2 */ 0x91000000 + (sigf_uc << 10), /* add x0, x0, #SIGF_UC */
+    /* 3 */ 0xd2800000 + (sys_sigreturn << 5) + 0x8, /* mov x8, #SYS_sigreturn */
+    /* 4 */ 0xd4000001,                 /* svc #0 */
+    /* 5 */ 0xd2800028 + (sys_exit << 5) + 0x8, /* mov x8, #SYS_exit */
+    /* 6 */ 0xd4000001,                 /* svc #0 */
+    /* 7 */ 0x17fffffc,                 /* b -4 */
+    /* 8 */ sys_sigreturn,
+    /* 9 */ sys_exit
+    };
+
+    for (i = 0; i < 9; i++) {
+        tswap32s(&sigtramp_code[i]);
+    }
+
+    return memcpy_to_target(offset, sigtramp_code, TARGET_SZSIGCODE);
+}
+#endif /* TARGET_ARCH_SIGTRAMP_H */
