Change startup ABI for untrusted code to be C-compatible

src/trusted/service_runtime/nacl_config.h

 /*
  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL).
  *
  * NOTE: This header is ALSO included by assembler files and hence
@@ skipping 144 matching lines @@
 #  define NACL_SYSARGS_FIX        (NACL_USERRET_FIX + 0x4)
 #  define NACL_SYSCALLRET_FIX     (NACL_USERRET_FIX + 0x4)
 /*
  * System V Application Binary Interface, Intel386 Architcture
  * Processor Supplement, section 3-10, says stack alignment is
  * 4-bytes, but gcc-generated code can require 16-byte alignment
  * (depending on compiler flags in force) for SSE instructions, so we
  * must do so here as well.
  */
 #  define NACL_STACK_ALIGN_MASK   (0xf)
+#  define NACL_STACK_GETS_ARG     (1)
+#  define NACL_STACK_PAD_BELOW_ALIGN (4)
 
 # elif NACL_BUILD_SUBARCH == 64
 #  define NACL_USERRET_FIX        (0x8)
 #  define NACL_SYSARGS_FIX        (-0x18)
 #  define NACL_SYSCALLRET_FIX     (0x10)
 /*
  * System V Application Binary Interface, AMD64 Architecture Processor
  * Supplement, at http://www.x86-64.org/documentation/abi.pdf, section
  * 3.2.2 discusses stack alignment.
  */
 #  define NACL_STACK_ALIGN_MASK   (0xf)
+#  define NACL_STACK_GETS_ARG     (0)
+#  define NACL_STACK_PAD_BELOW_ALIGN (8)
 # else /* NACL_BUILD_SUBARCH */
 #  error Unknown platform!
 # endif /* NACL_BUILD_SUBARCH */
 
 #elif NACL_ARCH(NACL_BUILD_ARCH) == NACL_arm
 
 # define NACL_HALT         mov pc, #0
 /* 16-byte bundles, 256MB code segment*/
 # define NACL_CONTROL_FLOW_MASK      0xF000000F
 
 # define NACL_DATA_FLOW_MASK      0xC0000000
 
 # define NACL_USERRET_FIX         (0x4)
 # define NACL_SYSARGS_FIX         (NACL_USERRET_FIX + 0x4)
 # define NACL_SYSCALLRET_FIX      (NACL_USERRET_FIX + 0x4)
 /*
  * See ARM Procedure Call Standard, ARM IHI 0042D, section 5.2.1.2.
  * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042a/IHI0042A_aapcs.pdf
  * -- the "public" stack alignment is required to be 8 bytes,
  */
 # define NACL_STACK_ALIGN_MASK    (0x7)
+# define NACL_STACK_GETS_ARG      (0)
+# define NACL_STACK_PAD_BELOW_ALIGN (0)
 
 /* TODO(robertm): unify this with NACL_BLOCK_SHIFT */
 /* 16 byte bundles */
 # define  NACL_ARM_BUNDLE_SIZE_LOG 4
 
 /*
  * NOTE: Used by various assembler files, needs to be
  *       synchronized with NaClThreadContext
  */
 # define NACL_CALLEE_SAVE_LIST {r4, r5, r6, r7, r8, r9, r10, fp, sp}
 
 
 
 #else /* NACL_ARCH(NACL_BUILD_ARCH) */
 
 # error Unknown platform!
 
 #endif /* NACL_ARCH(NACL_BUILD_ARCH) */
 
 
 #endif  /* NATIVE_CLIENT_SERVICE_RUNTIME_NACL_CONFIG_H_ */