http://sourceware.org/bugzilla/show_bug.cgi?id=12327
Summary: x86 relocatable kernel is broken
Product: binutils
Version: 2.22 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sources.redhat.com
ReportedBy: hjl.to...@gmail.com
In linux kernel, we have ‘jiffies = jiffies_64;’ in vmlinux.lds.S.
The jiffies isn’t in any section. In kernel build, there is warning saying
jiffies is an absolute address and can't relocatable. In my system, this cause
boot panic.
Kernel config has
CONFIG_RELOCATABLE=y
Kernel build log has
WARNING: Absolute relocations present
Offset Info Type Sym.Value Sym.Name
c102cc8a 00de5a01 R_386_32 c170ba40 jiffies
c103635d 00de5a01 R_386_32 c170ba40 jiffies
c1036658 00de5a01 R_386_32 c170ba40 jiffies
Linker command is
ld -m elf_i386 --emit-relocs --build-id -o vmlinux -T
arch/x86/kernel/vmlinux.lds arch/x86/kernel/head_32.o arch/x86/kernel/head32.o
arch/x86/kernel/head.o arch/x86/kernel/init_task.o init/built-in.o
--start-group usr/built-in.o arch/x86/built-in.o kernel/built-in.o
mm/built-in.o fs/built-in.o ipc/built-in.o security/built-in.o
crypto/built-in.o block/built-in.o lib/lib.a arch/x86/lib/lib.a
lib/built-in.o arch/x86/lib/built-in.o drivers/built-in.o sound/built-in.o
firmware/built-in.o arch/x86/pci/built-in.o arch/x86/oprofile/built-in.o
arch/x86/power/built-in.o arch/x86/video/built-in.o net/built-in.o
--end-group .tmp_kallsyms2.o
arch/x86/kernel/vmlinux.lds has
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(phys_startup_32)
jiffies = jiffies_64;
PHDRS {
text PT_LOAD FLAGS(5); /* R_E */
data PT_LOAD FLAGS(7); /* RWE */
note PT_NOTE FLAGS(0); /* ___ */
}
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