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H. Peter Anvin b352fc61e3 x86, realmode: 16-bit real-mode code support for relocs tool

commit 6520fe5564 upstream.

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>
[bwh: Backported to 3.2:
 - Adjust context (no archheaders; no insn_sanity)
 - Expand put_unaligned_le32()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

2012-05-31 00:44:08 +01:00

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scripts contains sources for various helper programs used throughout

the kernel for the build process.

---------------------------------------------------------------------------

kallsyms: Find all symbols in vmlinux

pnmttologo: Convert pnm files to logo files

conmakehash: Create chartable

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-$(CONFIG_VT) += conmakehash hostprogs-$(CONFIG_IKCONFIG) += bin2c hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount

always := $(hostprogs-y) $(hostprogs-m)

The following hostprogs-y programs are only build on demand

hostprogs-y += unifdef docproc

These targets are used internally to avoid "is up to date" messages

PHONY += build_unifdef build_unifdef: scripts/unifdef FORCE @: build_docproc: scripts/docproc FORCE @:

subdir-$(CONFIG_MODVERSIONS) += genksyms subdir-y += mod subdir-$(CONFIG_SECURITY_SELINUX) += selinux subdir-$(CONFIG_DTC) += dtc

Let clean descend into subdirs

subdir- += basic kconfig package selinux

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