jail: add support for ARM architecture

SECCOMP_FILTER isn't supported on ARM OABI.
Thus enable seccomp support in jail only for EABI.
thumb might work as well as it apparently implies EABI, but
yet doesn't set __ARM_EABI__.

The REG_SYSCALL macro seems to be an unused left-over.
However, it's defined for other architectures as well.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/jail/seccomp-bpf.h b/jail/seccomp-bpf.h
index 1cc2908..40fe7b9 100644 (file)
--- a/jail/seccomp-bpf.h
+++ b/jail/seccomp-bpf.h
@@ -68,6 +68,9 @@ struct seccomp_data {
 #elif defined(__mips__)
 # define REG_SYSCALL   regs[2]
 # define ARCH_NR       AUDIT_ARCH_MIPSEL
+#elif defined(__arm__) && (defined(__ARM_EABI__) || defined(__thumb__))
+# define REG_SYSCALL   regs.uregs[7]
+# define ARCH_NR       AUDIT_ARCH_ARM
 #else
 # warning "Platform does not support seccomp filter yet"
 # define REG_SYSCALL   0