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| author | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-08 21:22:24 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-05-18 19:49:40 -0700 |
| commit | 6520fe5564acf07ade7b18a1272db1184835c487 (patch) | |
| tree | 363c95dea4c9202c2fbe1ebcfd9dd7b97c7422ac /scripts | |
| parent | 36be50515fe2aef61533b516fa2576a2c7fe7664 (diff) | |
| download | lwn-6520fe5564acf07ade7b18a1272db1184835c487.tar.gz lwn-6520fe5564acf07ade7b18a1272db1184835c487.zip | |
x86, realmode: 16-bit real-mode code support for relocs tool
A new option is added to the relocs tool called '--realmode'.
This option causes the generation of 16-bit segment relocations
and 32-bit linear relocations for the real-mode code. When
the real-mode code is moved to the low-memory during kernel
initialization, these relocation entries can be used to
relocate the code properly.
In the assembly code 16-bit segment relocations must be relative
to the 'real_mode_seg' absolute symbol. Linear relocations must be
relative to a symbol prefixed with 'pa_'.
16-bit segment relocation is used to load cs:ip in 16-bit code.
Linear relocations are used in the 32-bit code for relocatable
data references. They are declared in the linker script of the
real-mode code.
The relocs tool is moved to arch/x86/tools/relocs.c, and added new
target archscripts that can be used to build scripts needed building
an architecture. be compiled before building the arch/x86 tree.
[ hpa: accelerating this because it detects invalid absolute
relocations, a serious bug in binutils 2.22.52.0.x which currently
produces bad kernels. ]
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-2-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Makefile | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/scripts/Makefile b/scripts/Makefile index df7678febf27..36266665dbcb 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -8,6 +8,8 @@ # conmakehash: Create arrays for initializing the kernel console tables # docproc: Used in Documentation/DocBook +HOST_EXTRACFLAGS += -I$(srctree)/tools/include + hostprogs-$(CONFIG_KALLSYMS) += kallsyms hostprogs-$(CONFIG_LOGO) += pnmtologo hostprogs-$(CONFIG_VT) += conmakehash |