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authorNicolas Pitre <nicolas.pitre@linaro.org>2011-04-27 14:54:39 -0400
committerNicolas Pitre <nico@fluxnic.net>2011-05-07 00:08:03 -0400
commit8d7e4cc2c8ea1d180d32d902eb899f27d3ee53d7 (patch)
tree899c64ebde52465cfae79f4908602ae4883e4c1e
parent8ea0de4b8831513924e3ec6a17bb721fabf97055 (diff)
ARM: zImage: make sure no GOTOFF relocs are used with .bss symbols
To be able to relocate the .bss section at run time independently from the rest of the code, we must make sure that no GOTOFF relocations are used with .bss symbols. This usually means that no global variables can be marked static unless they're also const. To enforce this, suffice to fail the build whenever a private symbol is allocated to .bss and list those symbols for convenience. The user_stack and user_stack_end labels in head.S were converted into non exported symbols to remove false positives. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Tony Lindgren <tony@atomide.com>
-rw-r--r--arch/arm/boot/compressed/Makefile15
-rw-r--r--arch/arm/boot/compressed/head.S6
2 files changed, 17 insertions, 4 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 79b5c62746df..23aad0722303 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -120,10 +120,23 @@ lib1funcs = $(obj)/lib1funcs.o
$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
$(call cmd,shipped)
+# We need to prevent any GOTOFF relocs being used with references
+# to symbols in the .bss section since we cannot relocate them
+# independently from the rest at run time. This can be achieved by
+# ensuring that no private .bss symbols exist, as global symbols
+# always have a GOT entry which is what we need.
+# The .data section is already discarded by the linker script so no need
+# to bother about it here.
+check_for_bad_syms = \
+bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
+[ -z "$$bad_syms" ] || \
+ ( echo "following symbols must have non local/private scope:" >&2; \
+ echo "$$bad_syms" >&2; rm -f $@; false )
+
$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
$(call if_changed,ld)
- @:
+ @$(check_for_bad_syms)
$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
$(call if_changed,$(suffix_y))
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index b541217bd040..8d5d91aefbb9 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -372,7 +372,7 @@ LC0: .word LC0 @ r1
.word input_data_end - 4 @ r10 (inflated size location)
.word _got_start @ r11
.word _got_end @ ip
- .word user_stack_end @ sp
+ .word .L_user_stack_end @ sp
.size LC0, . - LC0
#ifdef CONFIG_ARCH_RPC
@@ -1100,5 +1100,5 @@ reloc_code_end:
.align
.section ".stack", "aw", %nobits
-user_stack: .space 4096
-user_stack_end:
+.L_user_stack: .space 4096
+.L_user_stack_end: