AArch64 port

This commit adds a back-end for the AArch64 architecture, namely ARMv8
in 64-bit mode.

3 files changed, 156 insertions, 0 deletions

diff --git a/runtime/Makefile b/runtime/Makefile
index 8fe00934..6777995d 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -22,6 +22,8 @@ ifeq ($(ARCH),x86_64)
 OBJS=i64_dtou.o i64_utod.o i64_utof.o vararg.o
 else ifeq ($(ARCH),powerpc64)
 OBJS=i64_dtou.o i64_stof.o i64_utod.o i64_utof.o vararg.o
+else ifeq ($(ARCH),aarch64)
+OBJS=vararg.o
 else
 OBJS=i64_dtos.o i64_dtou.o i64_sar.o i64_sdiv.o i64_shl.o \
   i64_shr.o i64_smod.o i64_stod.o i64_stof.o \
diff --git a/runtime/aarch64/sysdeps.h b/runtime/aarch64/sysdeps.h
new file mode 100644
index 00000000..0cee9ae3
--- /dev/null
+++ b/runtime/aarch64/sysdeps.h
@@ -0,0 +1,45 @@
+// *****************************************************************
+//
+//               The Compcert verified compiler
+//
+//           Xavier Leroy, Collège de France and INRIA Paris
+//
+// Copyright (c) Institut National de Recherche en Informatique et
+//  en Automatique.
+//	
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of the <organization> nor the
+//       names of its contributors may be used to endorse or promote products
+//       derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 <COPYRIGHT
+// HOLDER> 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.
+//
+// *********************************************************************
+
+// System dependencies
+
+#define FUNCTION(f) \
+	.text; \
+        .balign 16; \
+	.globl f; \
+f:
+
+#define ENDFUNCTION(f) \
+	.type f, @function; .size f, . - f
+
diff --git a/runtime/aarch64/vararg.S b/runtime/aarch64/vararg.S
new file mode 100644
index 00000000..b7347d65
--- /dev/null
+++ b/runtime/aarch64/vararg.S
@@ -0,0 +1,109 @@
+// *****************************************************************
+//
+//               The Compcert verified compiler
+//
+//           Xavier Leroy, Collège de France and INRIA Paris
+//
+// Copyright (c) Institut National de Recherche en Informatique et
+//  en Automatique.
+//	
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of the <organization> nor the
+//       names of its contributors may be used to endorse or promote products
+//       derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 <COPYRIGHT
+// HOLDER> 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.
+//
+// *********************************************************************
+
+// Helper functions for variadic functions <stdarg.h>.  AArch64 version.
+
+#include "sysdeps.h"	
+
+// typedef struct __va_list {
+//   void *__stack;             // next stack parameter
+//   void *__gr_top;            // top of the save area for int regs
+//   void *__vr_top;            // top of the save area for float regs
+//   int__gr_offs;              // offset from gr_top to next int reg
+//   int__vr_offs;              // offset from gr_top to next FP reg
+// }
+// typedef struct __va_list va_list;   // struct passed by reference
+// unsigned int __compcert_va_int32(va_list * ap);
+// unsigned long long __compcert_va_int64(va_list * ap);
+// double __compcert_va_float64(va_list * ap);
+
+FUNCTION(__compcert_va_int32)
+        ldr     w1, [x0, #24]   // w1 = gr_offs
+        cbz     w1, 1f
+  // gr_offs is not zero: load from int save area and update gr_offs
+        ldr     x2, [x0, #8]    // x2 = gr_top
+        ldr     w2, [x2, w1, sxtw] // w2 = the next integer
+        add     w1, w1, #8
+        str     w1, [x0, #24]   // update gr_offs
+        mov     w0, w2
+	ret
+  // gr_offs is zero: load from stack save area and update stack pointer
+1:      ldr     x1, [x0, #0]    // x1 = stack
+        ldr     w2, [x1, #0]    // w2 = the next integer
+        add     x1, x1, #8
+        str     x1, [x0, #0]    // update stack
+        mov     w0, w2
+	ret
+ENDFUNCTION(__compcert_va_int32)
+
+FUNCTION(__compcert_va_int64)
+        ldr     w1, [x0, #24]   // w1 = gr_offs
+        cbz     w1, 1f
+  // gr_offs is not zero: load from int save area and update gr_offs
+        ldr     x2, [x0, #8]    // x2 = gr_top
+        ldr     x2, [x2, w1, sxtw] // w2 = the next long integer
+        add     w1, w1, #8
+        str     w1, [x0, #24]   // update gr_offs
+        mov     x0, x2
+	ret
+  // gr_offs is zero: load from stack save area and update stack pointer
+1:      ldr     x1, [x0, #0]    // x1 = stack
+        ldr     x2, [x1, #0]    // w2 = the next long integer
+        add     x1, x1, #8
+        str     x1, [x0, #0]    // update stack
+        mov     x0, x2
+	ret
+ENDFUNCTION(__compcert_va_int64)
+
+FUNCTION(__compcert_va_float64)
+        ldr     w1, [x0, #28]   // w1 = vr_offs
+        cbz     w1, 1f
+  // vr_offs is not zero: load from float save area and update vr_offs
+        ldr     x2, [x0, #16]   // x2 = vr_top
+        ldr     d0, [x2, w1, sxtw] // d0 = the next float
+        add     w1, w1, #16
+        str     w1, [x0, #28]   // update vr_offs
+	ret
+  // gr_offs is zero: load from stack save area and update stack pointer
+1:      ldr     x1, [x0, #0]    // x1 = stack
+        ldr     d0, [x1, #0]    // d0 = the next float
+        add     x1, x1, #8
+        str     x1, [x0, #0]    // update stack
+	ret
+ENDFUNCTION(__compcert_va_float64)
+
+// Right now we pass structs by reference.  This is not ABI conformant.
+FUNCTION(__compcert_va_composite)
+	b	__compcert_va_int64
+ENDFUNCTION(__compcert_va_composite)