[PATCH] dhcpcd: add ARC support

[Alexey Brodkin]

This retrofits ARC support from upstream [1].
Should be a part of the next release of "dhcpcd".

https://github.com/NetworkConfiguration/dhcpcd/commit/82386110e67cf75c224e9817fce55e6b0f143266

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
---
 meta/recipes-connectivity/dhcpcd/dhcpcd_9.4.0.bb   |  1 +
 ...rc-privsep-linux.c-add-support-for-arc-28.patch | 60 ++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 meta/recipes-connectivity/dhcpcd/files/0002-src-privsep-linux.c-add-support-for-arc-28.patch

diff --git a/meta/recipes-connectivity/dhcpcd/dhcpcd_9.4.0.bb b/meta/recipes-connectivity/dhcpcd/dhcpcd_9.4.0.bb
index 56fcf5cc0b..5be480eb03 100644
--- a/meta/recipes-connectivity/dhcpcd/dhcpcd_9.4.0.bb
+++ b/meta/recipes-connectivity/dhcpcd/dhcpcd_9.4.0.bb
@@ -13,6 +13,7 @@ UPSTREAM_CHECK_URI = "https://roy.marples.name/downloads/dhcpcd/"
 
 SRC_URI = "https://roy.marples.name/downloads/${BPN}/${BPN}-${PV}.tar.xz \
            file://0001-remove-INCLUDEDIR-to-prevent-build-issues.patch \
+           file://0002-src-privsep-linux.c-add-support-for-arc-28.patch \
            file://dhcpcd.service \
            file://dhcpcd@.service \
            "
diff --git a/meta/recipes-connectivity/dhcpcd/files/0002-src-privsep-linux.c-add-support-for-arc-28.patch b/meta/recipes-connectivity/dhcpcd/files/0002-src-privsep-linux.c-add-support-for-arc-28.patch
new file mode 100644
index 0000000000..ec895143d8
--- /dev/null
+++ b/meta/recipes-connectivity/dhcpcd/files/0002-src-privsep-linux.c-add-support-for-arc-28.patch
@@ -0,0 +1,60 @@
+From 82386110e67cf75c224e9817fce55e6b0f143266 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice at gmail.com>
+Date: Mon, 8 Feb 2021 07:23:54 +0100
+Subject: [PATCH] src/privsep-linux.c: add support for arc (#28)
+
+Fix the following build failure:
+
+privsep-linux.c:206:4: error: #error "Platform does not support seccomp filter yet"
+ #  error "Platform does not support seccomp filter yet"
+    ^~~~~
+In file included from privsep-linux.c:36:
+privsep-linux.c:213:38: error: 'SECCOMP_AUDIT_ARCH' undeclared here (not in a function); did you mean 'SECCOMP_ALLOW_ARG'?
+  BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, SECCOMP_AUDIT_ARCH, 1, 0),
+                                      ^~~~~~~~~~~~~~~~~~
+
+It should be noted that AUDIT_ARCH_{ARCOMPACT,ARCV2} is only defined
+since kernel 5.2 and
+https://github.com/torvalds/linux/commit/67f2a8a29311841ba6ab9b0e2d1b8f1e9978cd84
+
+Detection of arc compact and arc v2 have been "copy/pasted" from
+https://github.com/wbx-github/uclibc-ng/commit/afab56958f1cbb47b831ee3ebff231dfbae74af2
+
+Fixes:
+ - http://autobuild.buildroot.org/results/d29083700a80dd647621eed06faeeae03f0587d3
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
+---
+ src/privsep-linux.c | 16 ++++++++++++++++
+ 1 file changed, 16 insertions(+)
+
+diff --git a/src/privsep-linux.c b/src/privsep-linux.c
+index 402667af..21d41a9a 100644
+--- a/src/privsep-linux.c
++++ b/src/privsep-linux.c
+@@ -149,6 +149,22 @@ ps_root_sendnetlink(struct dhcpcd_ctx *ctx, int protocol, struct msghdr *msg)
+ #  define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386
+ #elif defined(__x86_64__)
+ #  define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64
++#elif defined(__arc__)
++#  if defined(__A7__)
++#    if (BYTE_ORDER == LITTLE_ENDIAN)
++#      define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACT
++#    else
++#      define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACTBE
++#    endif
++#  elif defined(__HS__)
++#    if (BYTE_ORDER == LITTLE_ENDIAN)
++#      define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2
++#    else
++#      define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2BE
++#    endif
++#  else
++#    error "Platform does not support seccomp filter yet"
++#  endif
+ #elif defined(__arm__)
+ #  ifndef EM_ARM
+ #    define EM_ARM 40
+-- 
+2.16.2
+
-- 
2.16.2