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[bpf-next,v3,08/12] selftests/bpf: convenience macro for use with 'asm volatile' blocks

Message ID 20230120034314.1921848-9-memxor@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Dynptr fixes | expand

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netdev/fixes_present success Fixes tag not required for -next series
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netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 12 maintainers not CCed: linux-kselftest@vger.kernel.org naveen.n.rao@linux.vnet.ibm.com kpsingh@kernel.org Kenta.Tada@sony.com 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
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
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Commit Message

Kumar Kartikeya Dwivedi Jan. 20, 2023, 3:43 a.m. UTC 
From: Eduard Zingerman <eddyz87@gmail.com>

A set of macros useful for writing naked BPF functions using inline
assembly. E.g. as follows:

struct map_struct {
	...
} map SEC(".maps");

SEC(...)
__naked int foo_test(void)
{
	asm volatile(
		"r0 = 0;"
		"*(u64*)(r10 - 8) = r0;"
		"r1 = %[map] ll;"
		"r2 = r10;"
		"r2 += -8;"
		"call %[bpf_map_lookup_elem];"
		"r0 = 0;"
		"exit;"
		:
		: __imm(bpf_map_lookup_elem),
		  __imm_addr(map)
		: __clobber_all);
}

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
[ Kartikeya: Add acks, include __clobber_common from Andrii ]
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/testing/selftests/bpf/progs/bpf_misc.h | 7 +++++++
 1 file changed, 7 insertions(+)
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 4a01ea9113bf..2d7b89b447b2 100644
--- a/tools/testing/selftests/bpf/progs/bpf_misc.h
+++ b/tools/testing/selftests/bpf/progs/bpf_misc.h
@@ -7,6 +7,13 @@ 
 #define __success		__attribute__((btf_decl_tag("comment:test_expect_success")))
 #define __log_level(lvl)	__attribute__((btf_decl_tag("comment:test_log_level="#lvl)))
 
+/* Convenience macro for use with 'asm volatile' blocks */
+#define __naked __attribute__((naked))
+#define __clobber_all "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "memory"
+#define __clobber_common "r0", "r1", "r2", "r3", "r4", "r5", "memory"
+#define __imm(name) [name]"i"(name)
+#define __imm_addr(name) [name]"i"(&name)
+
 #if defined(__TARGET_ARCH_x86)
 #define SYSCALL_WRAPPER 1
 #define SYS_PREFIX "__x64_"