diff options
| author | Eduard Zingerman <eddyz87@gmail.com> | 2023-01-21 05:52:37 +0530 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-01-20 17:55:03 -0800 |
| commit | 91b875a5e43b3a8dec4fbdca067c8860004b5f0e (patch) | |
| tree | bab8c7725800dd1098181173d86babe99d84f97c /tools/testing/selftests/bpf/progs/bpf_misc.h | |
| parent | 1ee72bcbe48de6dcfa44d6eba0aec6e42d04cd4d (diff) | |
selftests/bpf: convenience macro for use with 'asm volatile' blocks
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>
Link: https://lore.kernel.org/r/20230121002241.2113993-9-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/bpf_misc.h')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/bpf_misc.h | 7 |
1 files changed, 7 insertions, 0 deletions
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_" |