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authorDaniel Schwierzeck <daniel.schwierzeck@gmail.com>2014-10-29 17:30:36 +0100
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>2014-11-01 18:18:05 +0100
commit265072ba75d7a931ed0a751d5192220bcc5cc230 (patch)
treed7d61734f85ae2725746266a38d9496c1cad4d09
parent837cad1e47d2e8a81956140d37ee23f5d3c07de6 (diff)
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MIPS: add .padding section to linker script
Commit 79fd7e649e287228a1445820a72f7dd33baedb96 MIPS: always keep all sections in u-boot ELF binary. Always keep all sections in u-boot ELF binary. Move all unneeded sections after _end to avoid allocating space in the final binary. Also remove .deadcode section which is now obsolete. removed section .deadcode because the original symptoms were not visible anymore. Unfortuneatly the binutils bug still exists. The size of .rel.dyn section is often bigger than needed for all entries. But objcopy only allocates space as much as required for all reloc entries. Thus there is a gap between the last entry and __rel_dyn_end in u-boot.bin. If u-boot is booted from RAM (e.g. in SPL scenarios) that area could contain garbage data which could lead to CPU exceptions during relocation. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
-rw-r--r--arch/mips/config.mk2
-rw-r--r--arch/mips/cpu/u-boot.lds18
2 files changed, 19 insertions, 1 deletions
diff --git a/arch/mips/config.mk b/arch/mips/config.mk
index b758116..4dc88f4 100644
--- a/arch/mips/config.mk
+++ b/arch/mips/config.mk
@@ -71,4 +71,4 @@ PLATFORM_LDFLAGS += -G 0 -static -n -nostdlib
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
LDFLAGS_FINAL += --gc-sections -pie
OBJCOPYFLAGS += -j .text -j .rodata -j .data -j .got
-OBJCOPYFLAGS += -j .u_boot_list -j .rel.dyn
+OBJCOPYFLAGS += -j .u_boot_list -j .rel.dyn -j .padding
diff --git a/arch/mips/cpu/u-boot.lds b/arch/mips/cpu/u-boot.lds
index e504ea7..7d71c11 100644
--- a/arch/mips/cpu/u-boot.lds
+++ b/arch/mips/cpu/u-boot.lds
@@ -61,6 +61,24 @@ SECTIONS
__rel_dyn_end = .;
}
+ .padding : {
+ /*
+ * 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)
+ }
+
_end = .;
.bss __rel_dyn_start (OVERLAY) : {