From: Gabor Juhos juhosg@openwrt.org
This section contain the table needed for dynamic relocation. Also provide symbols for the relocation code to access the table.
Discard all sections which are not needed in the final ELF binary and U-Boot image. Section .dynsym cannot be discarded or GNU ld crashes otherwise. This section will be stripped by GNU objcpy in a later patch.
Signed-off-by: Gabor Juhos juhosg@openwrt.org Signed-off-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com --- Changes since v1: - add back the .deadcode section (see code comment for explanation)
arch/mips/cpu/u-boot.lds | 42 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-)
diff --git a/arch/mips/cpu/u-boot.lds b/arch/mips/cpu/u-boot.lds index 4cd983a..10513ab 100644 --- a/arch/mips/cpu/u-boot.lds +++ b/arch/mips/cpu/u-boot.lds @@ -70,7 +70,35 @@ SECTIONS . = ALIGN(4); __image_copy_end = .;
- .bss : { + .rel.dyn : { + __rel_dyn_start = .; + *(.rel.dyn) + __rel_dyn_end = .; + } + + .deadcode : { + /* + * Workaround for a binutils feature (or bug?). + * + * The GNU ld from binutils puts the dynamic relocation + * entries into the .rel.dyn section. Sometimes it + * allocates more dynamic relocation entries than it needs + * and the unused slots are set to R_MIPS_NONE entries. + * + * However the size of the .rel.dyn section in the ELF + * section header does not cover the unused entries, so + * objcopy removes those during stripping. + * + * Create a small section here to avoid that. + */ + LONG(0xffffffff); + } + + .dynsym : { + *(.dynsym) + } + + .bss __rel_dyn_start (OVERLAY) : { __bss_start = .; *(.sbss.*) *(.bss.*) @@ -78,4 +106,16 @@ SECTIONS . = ALIGN(4); __bss_end = .; } + + /DISCARD/ : { + *(.dynbss) + *(.dynstr) + *(.dynamic) + *(.interp) + *(.hash) + *(.gnu.*) + *(.plt) + *(.got.plt) + *(.rel.plt) + } } -- 1.8.1.1