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[RFC,bpf-next,4/5] selftests/bpf: __imm_insn macro to embed raw insns in inline asm

Message ID 20230123145148.2791939-5-eddyz87@gmail.com (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series test_verifier tests migration to inline assembly | expand

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netdev/header_inline success No static functions without inline keyword in header files
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netdev/cc_maintainers warning 11 maintainers not CCed: linux-kselftest@vger.kernel.org naveen.n.rao@linux.vnet.ibm.com kpsingh@kernel.org haoluo@google.com song@kernel.org martin.lau@linux.dev sdf@google.com john.fastabend@gmail.com shuah@kernel.org jolsa@kernel.org mykolal@fb.com
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Commit Message

Eduard Zingerman Jan. 23, 2023, 2:51 p.m. UTC 
A convenience macro to allow the following usage:

  #include <linux/filter.h>

  ...
  asm volatile (
  ...
  ".8byte %[raw_insn];"
  ...
  :
  : __imm_insn(raw_insn, BPF_RAW_INSN(...))
  : __clobber_all);

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 tools/testing/selftests/bpf/progs/bpf_misc.h | 1 +
 1 file changed, 1 insertion(+)

Comments

Andrii Nakryiko Jan. 26, 2023, 2:48 a.m. UTC | #1 
On Mon, Jan 23, 2023 at 6:52 AM Eduard Zingerman <eddyz87@gmail.com> wrote:
>
> A convenience macro to allow the following usage:
>
>   #include <linux/filter.h>
>
>   ...
>   asm volatile (
>   ...
>   ".8byte %[raw_insn];"
>   ...
>   :
>   : __imm_insn(raw_insn, BPF_RAW_INSN(...))
>   : __clobber_all);
>

Ah, now I see why it's __imm_insns. Makes sense. Hopefully this won't
be used very frequently anyways.

> Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
> ---
>  tools/testing/selftests/bpf/progs/bpf_misc.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/testing/selftests/bpf/progs/bpf_misc.h b/tools/testing/selftests/bpf/progs/bpf_misc.h
> index e742a935de98..832bec4818d9 100644
> --- a/tools/testing/selftests/bpf/progs/bpf_misc.h
> +++ b/tools/testing/selftests/bpf/progs/bpf_misc.h
> @@ -61,6 +61,7 @@
>  #define __clobber_common "r0", "r1", "r2", "r3", "r4", "r5", "memory"
>  #define __imm(name) [name]"i"(name)
>  #define __imm_addr(name) [name]"i"(&name)
> +#define __imm_insn(name, expr) [name]"i"(*(long *)&(expr))
>
>  #if defined(__TARGET_ARCH_x86)
>  #define SYSCALL_WRAPPER 1
> --
> 2.39.0
>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/bpf_misc.h b/tools/testing/selftests/bpf/progs/bpf_misc.h
index e742a935de98..832bec4818d9 100644
--- a/tools/testing/selftests/bpf/progs/bpf_misc.h
+++ b/tools/testing/selftests/bpf/progs/bpf_misc.h
@@ -61,6 +61,7 @@ 
 #define __clobber_common "r0", "r1", "r2", "r3", "r4", "r5", "memory"
 #define __imm(name) [name]"i"(name)
 #define __imm_addr(name) [name]"i"(&name)
+#define __imm_insn(name, expr) [name]"i"(*(long *)&(expr))
 
 #if defined(__TARGET_ARCH_x86)
 #define SYSCALL_WRAPPER 1