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Thu, 19 Jan 2023 23:04:27 -0800 (PST) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Andrii Nakryiko , Yonghong Song , Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Joanne Koong , David Vernet Subject: [PATCH bpf-next v4 08/12] selftests/bpf: convenience macro for use with 'asm volatile' blocks Date: Fri, 20 Jan 2023 12:33:51 +0530 Message-Id: <20230120070355.1983560-9-memxor@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230120070355.1983560-1-memxor@gmail.com> References: <20230120070355.1983560-1-memxor@gmail.com> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1699; i=memxor@gmail.com; h=from:subject; bh=SNRMXDcMW1zluX6a3W/WYa1RbpYDzrfdzhpCt6yThTA=; b=owEBbQKS/ZANAwAIAUzgyIZIvxHKAcsmYgBjyjzLs5JRMTd9QT6uBQgwWA2rgY8rE3jweRYNnMEY kA+RJ3KJAjMEAAEIAB0WIQRLvip+Buz51YI8YRFM4MiGSL8RygUCY8o8ywAKCRBM4MiGSL8RyhcAD/ 48GFDqIMM3+H6w3L6v0biyh5kVkqymLHEJd962rUtTS/9oe5Fsv+cMVK4GA10HWyHNKZhJIso0cFK1 AKRZKA55RkHf429kzvOIfjt7iNMTNxOud45tbPnQNI/B+rOR3e5xIKLVS5ctDzNrbjbAw8l/Q1ISCH TuxWg3VZIlZNtcKB9pWxu8RlmcakIVEZqvbtS1JIbi/YPaAQDMVEYTsi+httVQq3skwdoS87D7KWe1 9Gid2vWgQ16NNKw6BN1X3Xiy1J+dSlf6qFqzmFzdJ+RfZBjLX90s6uTMWvziE5Oqn2Ahk564BeOgWf /fVb9ismDG+M+JKRktunXfTZtPomzYRoV7JKbZvVvzAh9v2Gu0ELKJW+Ypot4gU5RUotT/Kr4ZbzlL JcfaM4BIk5Ilcvt65c+tAOaRPXGtDkcCYMZTyvL83cBmp+/ymmCrrdYo1DByGEO6cdJxnVIxw+weUL naBmkxqIQ/kG1E2DJSziN/Ofqa6mZzAeF+6R6fUhQapWTZ3tqoSGa8QugLrFNIfICPs0w+PJGTM7Nw esaafTA7IaX3q/HCDIMhvFxiuAX8kk2B4g4RjhURX7/5Bj/Mzq8NqbUp9aDfIUKn3GA9tSnuiEI5+x Qov8J3NoZLfwLiyC+/q2XReOe8AqjQPVavoAQx5l1vyxtLoWUu28dDUD3lbQ== X-Developer-Key: i=memxor@gmail.com; a=openpgp; fpr=4BBE2A7E06ECF9D5823C61114CE0C88648BF11CA Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Eduard Zingerman 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 Acked-by: Yonghong Song Signed-off-by: Eduard Zingerman [ Kartikeya: Add acks, include __clobber_common from Andrii ] Signed-off-by: Kumar Kartikeya Dwivedi --- tools/testing/selftests/bpf/progs/bpf_misc.h | 7 +++++++ 1 file changed, 7 insertions(+) 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_"