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| author | Tiezhu Yang <yangtiezhu@loongson.cn> | 2021-11-25 02:36:07 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2021-11-26 22:11:25 +0100 |
| commit | e32cb12ff52a2840fc1248998717f7b95c42f064 (patch) | |
| tree | a9fb4d103ceb18514b4cd50abdeb7c55fb35ef5e /tools/build | |
| parent | selftests/bpf: Fix misaligned accesses in xdp and xdp_bpf2bpf tests (diff) | |
| download | linux-e32cb12ff52a2840fc1248998717f7b95c42f064.tar.xz linux-e32cb12ff52a2840fc1248998717f7b95c42f064.zip | |
bpf, mips: Fix build errors about __NR_bpf undeclared
Add the __NR_bpf definitions to fix the following build errors for mips:
$ cd tools/bpf/bpftool
$ make
[...]
bpf.c:54:4: error: #error __NR_bpf not defined. libbpf does not support your arch.
# error __NR_bpf not defined. libbpf does not support your arch.
^~~~~
bpf.c: In function ‘sys_bpf’:
bpf.c:66:17: error: ‘__NR_bpf’ undeclared (first use in this function); did you mean ‘__NR_brk’?
return syscall(__NR_bpf, cmd, attr, size);
^~~~~~~~
__NR_brk
[...]
In file included from gen_loader.c:15:0:
skel_internal.h: In function ‘skel_sys_bpf’:
skel_internal.h:53:17: error: ‘__NR_bpf’ undeclared (first use in this function); did you mean ‘__NR_brk’?
return syscall(__NR_bpf, cmd, attr, size);
^~~~~~~~
__NR_brk
We can see the following generated definitions:
$ grep -r "#define __NR_bpf" arch/mips
arch/mips/include/generated/uapi/asm/unistd_o32.h:#define __NR_bpf (__NR_Linux + 355)
arch/mips/include/generated/uapi/asm/unistd_n64.h:#define __NR_bpf (__NR_Linux + 315)
arch/mips/include/generated/uapi/asm/unistd_n32.h:#define __NR_bpf (__NR_Linux + 319)
The __NR_Linux is defined in arch/mips/include/uapi/asm/unistd.h:
$ grep -r "#define __NR_Linux" arch/mips
arch/mips/include/uapi/asm/unistd.h:#define __NR_Linux 4000
arch/mips/include/uapi/asm/unistd.h:#define __NR_Linux 5000
arch/mips/include/uapi/asm/unistd.h:#define __NR_Linux 6000
That is to say, __NR_bpf is:
4000 + 355 = 4355 for mips o32,
6000 + 319 = 6319 for mips n32,
5000 + 315 = 5315 for mips n64.
So use the GCC pre-defined macro _ABIO32, _ABIN32 and _ABI64 [1] to define
the corresponding __NR_bpf.
This patch is similar with commit bad1926dd2f6 ("bpf, s390: fix build for
libbpf and selftest suite").
[1] https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/config/mips/mips.h#l549
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1637804167-8323-1-git-send-email-yangtiezhu@loongson.cn
Diffstat (limited to 'tools/build')
| -rw-r--r-- | tools/build/feature/test-bpf.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/build/feature/test-bpf.c b/tools/build/feature/test-bpf.c index 82070eadfc07..727d22e34a6e 100644 --- a/tools/build/feature/test-bpf.c +++ b/tools/build/feature/test-bpf.c @@ -14,6 +14,12 @@ # define __NR_bpf 349 # elif defined(__s390__) # define __NR_bpf 351 +# elif defined(__mips__) && defined(_ABIO32) +# define __NR_bpf 4355 +# elif defined(__mips__) && defined(_ABIN32) +# define __NR_bpf 6319 +# elif defined(__mips__) && defined(_ABI64) +# define __NR_bpf 5315 # else # error __NR_bpf not defined. libbpf does not support your arch. # endif |