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RFE: Add Alpha support #481

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e65e36f
RFE: Add Alpha support
glaubitz Feb 5, 2026
16bc55a
tests: update pfc coverage output for alpha
linmag7 May 22, 2026
9090720
arch-create-syscalls-csv: add alpha special syscall entries
linmag7 May 21, 2026
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ The libseccomp library currently supports the architectures listed below:
* 32-bit x86 (x86)
* 64-bit x86 (x86_64)
* 64-bit x86 x32 ABI (x32)
* 64-bit Alpha (alpha)
* 32-bit ARM EABI (arm)
* 64-bit ARM (aarch64)
* 64-bit LoongArch (loongarch64)
Expand Down
7 changes: 4 additions & 3 deletions doc/man/man1/scmp_sys_resolver.1
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Expand Up @@ -34,9 +34,10 @@ special manner by libseccomp depending on the operation.
.B \-a \fIARCH
The architecture to use for resolving the system call. Valid
.I ARCH
values are "x86", "x86_64", "x32", "arm", "aarch64", "loongarch64", "m68k",
"mips", "mipsel", "mips64", "mipsel64", "mips64n32", "mipsel64n32", "parisc",
"parisc64", "ppc", "ppc64", "ppc64le", "s390", "s390x", "sheb" and "sh".
values are "x86", "x86_64", "x32", "arm", "aarch64", "alpha", "loongarch64",
"m68k", "mips", "mipsel", "mips64", "mipsel64", "mips64n32", "mipsel64n32",
"parisc", "parisc64", "ppc", "ppc64", "ppc64le", "s390", "s390x", "sheb" and
"sh".
.TP
.B \-t
If necessary, translate the system call name to the proper system call number,
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5 changes: 5 additions & 0 deletions include/seccomp-syscalls.h
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Expand Up @@ -286,6 +286,7 @@
#define __PNR_listns -10252
#define __PNR_rseq_slice_yield -10253
#define __PNR_uprobe -10254
#define __PNR_open_tree_attr -10255

@mattst88 mattst88 Oct 29, 2026

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This looks like a fix for building against kernel headers that predate open_tree_attr, not something alpha-specific (alpha's headers define it as 577). Could it go in a separate commit?


/*
* libseccomp syscall definitions
Expand Down Expand Up @@ -1369,7 +1370,11 @@
#define __SNR_open_tree __PNR_open_tree
#endif

#ifdef __NR_open_tree_attr
#define __SNR_open_tree_attr __NR_open_tree_attr
#else
#define __SNR_open_tree_attr __PNR_open_tree_attr
#endif

#define __SNR_openat __NR_openat

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5 changes: 5 additions & 0 deletions include/seccomp.h.in
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Expand Up @@ -152,6 +152,11 @@ struct scmp_arg_cmp {
#endif /* AUDIT_ARCH_AARCH64 */
#define SCMP_ARCH_AARCH64 AUDIT_ARCH_AARCH64

/**
* The Alpha architecture tokens
*/
#define SCMP_ARCH_ALPHA AUDIT_ARCH_ALPHA

@mattst88 mattst88 Oct 29, 2026

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The other arches have a fallback for older kernel headers. AUDIT_ARCH_ALPHA has been around long enough that it probably doesn't matter, but for consistency:

Suggested change
#define SCMP_ARCH_ALPHA AUDIT_ARCH_ALPHA
#ifndef AUDIT_ARCH_ALPHA
#ifndef EM_ALPHA
#define EM_ALPHA 0x9026
#endif /* EM_ALPHA */
#define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
#endif /* AUDIT_ARCH_ALPHA */
#define SCMP_ARCH_ALPHA AUDIT_ARCH_ALPHA


/**
* The LoongArch architecture tokens
*/
Expand Down
1 change: 1 addition & 0 deletions src/Makefile.am
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Expand Up @@ -32,6 +32,7 @@ SOURCES_ALL = \
arch-x32.h arch-x32.c \
arch-arm.h arch-arm.c \
arch-aarch64.h arch-aarch64.c \
arch-alpha.h arch-alpha.c \
arch-loongarch64.h arch-loongarch64.c \
arch-m68k.h arch-m68k.c \
arch-mips.h arch-mips.c \
Expand Down
36 changes: 36 additions & 0 deletions src/arch-alpha.c
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@@ -0,0 +1,36 @@
/*
* This library is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License as
* published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, see <http://www.gnu.org/licenses>.
*/

#include <stdlib.h>
#include <errno.h>
#include <linux/audit.h>

#include "arch.h"
#include "arch-alpha.h"
#include "syscalls.h"

ARCH_DEF(alpha)

const struct arch_def arch_def_alpha = {
.token = SCMP_ARCH_ALPHA,
.token_bpf = AUDIT_ARCH_ALPHA,
.size = ARCH_SIZE_64,
.endian = ARCH_ENDIAN_LITTLE,
.syscall_resolve_name_raw = alpha_syscall_resolve_name,
.syscall_resolve_num_raw = alpha_syscall_resolve_num,
.syscall_rewrite = NULL,
.rule_add = NULL,
.syscall_name_kver = alpha_syscall_name_kver,
.syscall_num_kver = alpha_syscall_num_kver,
};
22 changes: 22 additions & 0 deletions src/arch-alpha.h
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@@ -0,0 +1,22 @@
/*
* This library is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License as
* published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, see <http://www.gnu.org/licenses>.
*/

#ifndef _ARCH_ALPHA_H
#define _ARCH_ALPHA_H

#include "arch.h"

ARCH_DECL(alpha)

#endif
32 changes: 28 additions & 4 deletions src/arch-create-syscalls-csv.py
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Expand Up @@ -26,9 +26,9 @@
import math
import os

arch_list = ['i386', 'x86_64', 'x32', 'arm', 'arm64', 'loongarch64', 'm68k',
'mipso32', 'mips64', 'mips64n32', 'parisc', 'parisc64', 'powerpc',
'powerpc64', 'riscv64', 's390', 's390x', 'sh']
arch_list = ['i386', 'x86_64', 'x32', 'arm', 'arm64', 'alpha', 'loongarch64',
'm68k', 'mipso32', 'mips64', 'mips64n32', 'parisc', 'parisc64',
'powerpc', 'powerpc64', 'riscv64', 's390', 's390x', 'sh']

kernel_versions = ['3.0', '3.1', '3.2', '3.3', '3.4', '3.5', '3.6', '3.7',
'3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14',
Expand Down Expand Up @@ -148,6 +148,7 @@
'afs_syscall': {'i386': [137, 'UNDEF'],
'x86_64': [183, 'UNDEF'],
'x32': [183, 'UNDEF'],
'alpha': [338, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -166,6 +167,7 @@
'bdflush': {'i386': [134, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [300, 'UNDEF'],
'arm': [134, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -184,6 +186,7 @@
'break': {'i386': [17, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -202,6 +205,7 @@
'breakpoint': {'i386': [None, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [983041, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -220,6 +224,7 @@
'create_module': {'i386': [127, 'UNDEF'],
'x86_64': [174, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [306, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -238,6 +243,7 @@
'ftime': {'i386': [35, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -256,6 +262,7 @@
'get_kernel_syms': {'i386': [130, 'UNDEF'],
'x86_64': [177, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [309, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -274,6 +281,7 @@
'getpmsg': {'i386': [188, 'UNDEF'],
'x86_64': [181, 'UNDEF'],
'x32': [181, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -292,6 +300,7 @@
'gtty': {'i386': [32, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -310,6 +319,7 @@
'idle': {'i386': [112, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -328,6 +338,7 @@
'lock': {'i386': [53, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -346,6 +357,7 @@
'mpx': {'i386': [56, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -363,7 +375,8 @@
'sh': [None, 'UNDEF']},
'nfsservctl': {'i386': [169, 'UNDEF'],
'x86_64': [180, 'UNDEF'],
'x32': [None, 'UNDEF'],
'x32': [42, 'UNDEF'],
'alpha': [None, 'UNDEF'],
Comment on lines +378 to +379

@mattst88 mattst88 Oct 29, 2026

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x32 doesn't have nfsservctl: syscall_64.tbl lists 180 64 nfsservctl, so it's 64-bit only. 42 on x32 is connect. Alpha does reserve a number for it, 342 common nfsservctl sys_ni_syscall, which matches how afs_syscall, tuxcall, etc. are handled above.

Suggested change
'x32': [42, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [342, 'UNDEF'],

'arm': [169, 'UNDEF'],
'arm64': [42, 'UNDEF'],
'loongarch64': [42, 'UNDEF'],
Expand All @@ -382,6 +395,7 @@
'prof': {'i386': [44, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -400,6 +414,7 @@
'profil': {'i386': [98, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -418,6 +433,7 @@
'putpmsg': {'i386': [189, 'UNDEF'],
'x86_64': [182, 'UNDEF'],
'x32': [182, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -436,6 +452,7 @@
'query_module': {'i386': [167, 'UNDEF'],
'x86_64': [178, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [347, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -454,6 +471,7 @@
'security': {'i386': [None, 'UNDEF'],
'x86_64': [185, 'UNDEF'],
'x32': [185, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -472,6 +490,7 @@
'stty': {'i386': [31, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -490,6 +509,7 @@
'_sysctl': {'i386': [149, 'UNDEF'],
'x86_64': [156, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [319, 'UNDEF'],
'arm': [149, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -508,6 +528,7 @@
'tuxcall': {'i386': [None, 'UNDEF'],
'x86_64': [184, 'UNDEF'],
'x32': [184, 'UNDEF'],
'alpha': [397, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -526,6 +547,7 @@
'ulimit': {'i386': [58, 'UNDEF'],
'x86_64': [None, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [None, 'UNDEF'],
'arm': [None, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -544,6 +566,7 @@
'uselib': {'i386': [86, 'UNDEF'],
'x86_64': [134, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [313, 'UNDEF'],
'arm': [86, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand All @@ -562,6 +585,7 @@
'vserver': {'i386': [273, 'UNDEF'],
'x86_64': [236, 'UNDEF'],
'x32': [None, 'UNDEF'],
'alpha': [428, 'UNDEF'],
'arm': [313, 'UNDEF'],
'arm64': [None, 'UNDEF'],
'loongarch64': [None, 'UNDEF'],
Expand Down
4 changes: 4 additions & 0 deletions src/arch-syscall-dump.c
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Expand Up @@ -40,6 +40,7 @@
#include "arch-mips64.h"
#include "arch-mips64n32.h"
#include "arch-aarch64.h"
#include "arch-alpha.h"
#include "arch-parisc.h"
#include "arch-parisc64.h"
#include "arch-ppc.h"
Expand Down Expand Up @@ -109,6 +110,9 @@ int main(int argc, char *argv[])
case SCMP_ARCH_AARCH64:
sys = aarch64_syscall_iterate(iter);
break;
case SCMP_ARCH_ALPHA:
sys = alpha_syscall_iterate(iter);
break;
case SCMP_ARCH_LOONGARCH64:
sys = loongarch64_syscall_iterate(iter);
break;
Expand Down
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