mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-07-12 00:35:23 +02:00

David Howells 4520c6a49a X.509: Add simple ASN.1 grammar compiler

Add a simple ASN.1 grammar compiler.  This produces a bytecode output that can
be fed to a decoder to inform the decoder how to interpret the ASN.1 stream it
is trying to parse.

Action functions can be specified in the grammar by interpolating:

	({ foo })

after a type, for example:

	SubjectPublicKeyInfo ::= SEQUENCE {
		algorithm		AlgorithmIdentifier,
		subjectPublicKey	BIT STRING ({ do_key_data })
		}

The decoder is expected to call these after matching this type and parsing the
contents if it is a constructed type.

The grammar compiler does not currently support the SET type (though it does
support SET OF) as I can't see a good way of tracking which members have been
encountered yet without using up extra stack space.

Currently, the grammar compiler will fail if more than 256 bytes of bytecode
would be produced or more than 256 actions have been specified as it uses
8-bit jump values and action indices to keep space usage down.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2012-10-08 13:50:19 +10:30

1.4 KiB

Raw Blame History

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-$(BUILD_C_RECORDMCOUNT) += recordmcount hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable hostprogs-$(CONFIG_ASN1) += asn1_compiler

HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include

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

1.4 KiB Raw Blame History