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arch/arm/lib/sections.c 1.24 KB
3ebd1cbc4   Albert ARIBAUD   arm: make __bss_s...
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  /*
   * Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
   *
1a4596601   Wolfgang Denk   Add GPL-2.0+ SPDX...
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   * SPDX-License-Identifier:	GPL-2.0+
3ebd1cbc4   Albert ARIBAUD   arm: make __bss_s...
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   */
  
  /**
   * These two symbols are declared in a C file so that the linker
   * uses R_ARM_RELATIVE relocation, rather than the R_ARM_ABS32 one
   * it would use if the symbols were defined in the linker file.
   * Using only R_ARM_RELATIVE relocation ensures that references to
   * the symbols are correct after as well as before relocation.
   *
   * We need a 0-byte-size type for these symbols, and the compiler
   * does not allow defining objects of C type 'void'. Using an empty
   * struct is allowed by the compiler, but causes gcc versions 4.4 and
   * below to complain about aliasing. Therefore we use the next best
   * thing: zero-sized arrays, which are both 0-byte-size and exempt from
   * aliasing warnings.
   */
df84502ed   Albert ARIBAUD   arm: generalize l...
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  char __bss_start[0] __attribute__((section(".__bss_start")));
  char __bss_end[0] __attribute__((section(".__bss_end")));
d026dec87   Albert ARIBAUD   arm: make __image...
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  char __image_copy_start[0] __attribute__((section(".__image_copy_start")));
  char __image_copy_end[0] __attribute__((section(".__image_copy_end")));
47bd65ef0   Albert ARIBAUD   arm: make __rel_d...
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  char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start")));
  char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end")));
d0b5d9da5   Albert ARIBAUD   arm: make _end co...
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  char _end[0] __attribute__((section(".__end")));