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sh: generate position independent code for all platforms

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Finally add fpic compilation option to produce relocatable code.
Note that this requires to define CONFIG_NEEDS_MANUAL_RELOC for all
board files, also relocation support still has some limitations
(e.g. a developer should care not to overwrite the executing code or
memset() with zeroes not yet relocated data on malloc init etc.),
which may be fixed while switching to PIE.

Due to short investigation the architecture code is not ready for PIE
linking, this will require some manipulations with .dyn* sections.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
This commit is contained in:
Vladimir Zapolskiy 2016-11-28 00:15:35 +02:00 committed by Tom Rini
parent 3500581ef3
commit 76a55989b1
2 changed files with 2 additions and 1 deletions
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1
arch/sh/config.mk
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@ -15,5 +15,6 @@ CONFIG_STANDALONE_LOAD_ADDR += -EB
endif
PLATFORM_CPPFLAGS += -DCONFIG_SH -D__SH__
PLATFORM_RELFLAGS += -fpic
LDFLAGS_FINAL = --gc-sections
PLATFORM_RELFLAGS += -ffixed-r13

2
arch/sh/cpu/u-boot.lds
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@ -60,7 +60,7 @@ SECTIONS
PROVIDE (_fgot = .);
.got :
{
*(.got)
*(.got.plt) *(.got)
. = ALIGN(4);
} >ram
PROVIDE (_egot = .);