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arch: add big endian support

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This patch adds Big Endian architecture support.  Even if a compiler
generating big endian object files is used, our linker script, or
include/linker/linker-tool-gcc.h to be precise, has default output
format as little endian.

This patch adds a hidden config CONFIG_BIG_ENDIAN, which should be set
by big endian architectures or a SoC's, and adds an condition to
switch OUTPUT_FORMAT in our linker.cmd.

Signed-off-by: Yasushi SHOJI <y-shoji@ispace-inc.com>
This commit is contained in:
Yasushi SHOJI 2018-10-09 18:59:16 +09:00 • committed by Anas Nashif
commit 6fc0d77432
3 changed files with 18 additions and 1 deletions
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7
include/linker/linker-tool-gcc.h
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@ -16,7 +16,12 @@
#define ZEPHYR_INCLUDE_LINKER_LINKER_TOOL_GCC_H_
#if defined(CONFIG_ARM)
OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
#if defined(CONFIG_BIG_ENDIAN)
#define OUTPUT_FORMAT_ "elf32-bigarm"
#else
#define OUTPUT_FORMAT_ "elf32-littlearm"
#endif
OUTPUT_FORMAT(OUTPUT_FORMAT_)
#elif defined(CONFIG_ARC)
OUTPUT_FORMAT("elf32-littlearc", "elf32-bigarc", "elf32-littlearc")
#elif defined(CONFIG_X86)