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 --- arch/sh/config.mk | 1 + arch/sh/cpu/u-boot.lds | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/sh/config.mk b/arch/sh/config.mk index 673ed8d..71540c8 100644 --- a/arch/sh/config.mk +++ b/arch/sh/config.mk @@ -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 diff --git a/arch/sh/cpu/u-boot.lds b/arch/sh/cpu/u-boot.lds index f2e48c6..bbf9ff4 100644 --- a/arch/sh/cpu/u-boot.lds +++ b/arch/sh/cpu/u-boot.lds @@ -60,7 +60,7 @@ SECTIONS PROVIDE (_fgot = .); .got : { - *(.got) + *(.got.plt) *(.got) . = ALIGN(4); } >ram PROVIDE (_egot = .);