zircon/scripts/dso-abi.h

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This file defines macros to handle the output of the shlib-symbols
// script (run without the -a switch).  These macros generate assembly
// code that should define symbols in a DSO such that the resultant DSO
// has the same ABI as the DSO input to shlib-symbols.

#define FUNCTION(NAME, SIZE) FUNCTION_1(global, NAME)
#define WEAK_FUNCTION(NAME, SIZE) FUNCTION_1(weak, NAME)

#define FUNCTION_1(BINDING, NAME) \
    .pushsection .text,"ax",%progbits; \
    .BINDING NAME; \
    .type NAME,%function; \
    NAME: .space 1; \
    .popsection

#define OBJECT_1(SECTION, SECFLAGS, SECTYPE, BINDING, NAME, SIZE) \
    .pushsection SECTION,SECFLAGS,%SECTYPE; \
    .BINDING NAME; \
    .type NAME,%object; \
    NAME: .space SIZE; \
    .size NAME,SIZE; \
    .popsection

#define RODATA_OBJECT(NAME, SIZE) \
    OBJECT_1(.rodata, "a", progbits, global, NAME, SIZE)
#define DATA_OBJECT(NAME, SIZE) \
    OBJECT_1(.data, "aw", progbits, global, NAME, SIZE)
#define WEAK_DATA_OBJECT(NAME, SIZE) \
    OBJECT_1(.data, "aw", progbits, weak, NAME, SIZE)
#define BSS_OBJECT(NAME, SIZE) \
    OBJECT_1(.bss, "aw", nobits, global, NAME, SIZE)

#define UNDEFINED_WEAK(NAME, SIZE) UNDEFINED_1(weak, NAME)
#define UNDEFINED(NAME, SIZE) UNDEFINED_1(globl, NAME)
#define UNDEFINED_1(BINDING, NAME) \
    .pushsection .undefined,"aw",%progbits; \
    .BINDING NAME; \
    .dc.a NAME; \
    .popsection