From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: bpf@vger.kernel.org
Cc: daniel@iogearbox.net, andrii@kernel.org,
torvalds@linux-foundation.org, brho@google.com,
hannes@cmpxchg.org, akpm@linux-foundation.org, urezki@gmail.com,
hch@infradead.org, linux-mm@kvack.org, kernel-team@fb.com
Subject: [PATCH v3 bpf-next 11/14] bpf: Add helper macro bpf_addr_space_cast()
Date: Thu, 7 Mar 2024 17:08:09 -0800 [thread overview]
Message-ID: <20240308010812.89848-12-alexei.starovoitov@gmail.com> (raw)
In-Reply-To: <20240308010812.89848-1-alexei.starovoitov@gmail.com>
From: Alexei Starovoitov <ast@kernel.org>
Introduce helper macro bpf_addr_space_cast() that emits:
rX = rX
instruction with off = BPF_ADDR_SPACE_CAST
and encodes dest and src address_space-s into imm32.
It's useful with older LLVM that doesn't emit this insn automatically.
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---
.../testing/selftests/bpf/bpf_experimental.h | 43 +++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index bc9a0832ae72..a5b9df38c162 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -343,6 +343,49 @@ l_true: \
asm volatile("%[reg]=%[reg]"::[reg]"r"((short)var))
#endif
+/* emit instruction:
+ * rX = rX .off = BPF_ADDR_SPACE_CAST .imm32 = (dst_as << 16) | src_as
+ */
+#ifndef bpf_addr_space_cast
+#define bpf_addr_space_cast(var, dst_as, src_as)\
+ asm volatile(".byte 0xBF; \
+ .ifc %[reg], r0; \
+ .byte 0x00; \
+ .endif; \
+ .ifc %[reg], r1; \
+ .byte 0x11; \
+ .endif; \
+ .ifc %[reg], r2; \
+ .byte 0x22; \
+ .endif; \
+ .ifc %[reg], r3; \
+ .byte 0x33; \
+ .endif; \
+ .ifc %[reg], r4; \
+ .byte 0x44; \
+ .endif; \
+ .ifc %[reg], r5; \
+ .byte 0x55; \
+ .endif; \
+ .ifc %[reg], r6; \
+ .byte 0x66; \
+ .endif; \
+ .ifc %[reg], r7; \
+ .byte 0x77; \
+ .endif; \
+ .ifc %[reg], r8; \
+ .byte 0x88; \
+ .endif; \
+ .ifc %[reg], r9; \
+ .byte 0x99; \
+ .endif; \
+ .short %[off]; \
+ .long %[as]" \
+ : [reg]"+r"(var) \
+ : [off]"i"(BPF_ADDR_SPACE_CAST) \
+ , [as]"i"((dst_as << 16) | src_as));
+#endif
+
/* Description
* Assert that a conditional expression is true.
* Returns
--
2.43.0
next prev parent reply other threads:[~2024-03-08 1:08 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-08 1:07 [PATCH v3 bpf-next 00/14] bpf: Introduce BPF arena Alexei Starovoitov
2024-03-08 1:07 ` [PATCH v3 bpf-next 01/14] bpf: Introduce bpf_arena Alexei Starovoitov
2024-03-11 22:01 ` Andrii Nakryiko
2024-03-11 22:41 ` Alexei Starovoitov
2024-03-11 22:59 ` Andrii Nakryiko
2024-03-12 0:47 ` Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 02/14] bpf: Disasm support for addr_space_cast instruction Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 03/14] bpf: Add x86-64 JIT support for PROBE_MEM32 pseudo instructions Alexei Starovoitov
2024-03-11 22:05 ` Andrii Nakryiko
2024-03-11 22:44 ` Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 04/14] bpf: Add x86-64 JIT support for bpf_addr_space_cast instruction Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 05/14] bpf: Recognize addr_space_cast instruction in the verifier Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 06/14] bpf: Recognize btf_decl_tag("arg:arena") as PTR_TO_ARENA Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 07/14] libbpf: Add __arg_arena to bpf_helpers.h Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 08/14] libbpf: Add support for bpf_arena Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 09/14] bpftool: Recognize arena map type Alexei Starovoitov
2024-03-11 17:08 ` Quentin Monnet
2024-03-08 1:08 ` [PATCH v3 bpf-next 10/14] libbpf: Recognize __arena global varaibles Alexei Starovoitov
2024-03-11 17:09 ` Quentin Monnet
2024-03-08 1:08 ` Alexei Starovoitov [this message]
2024-03-08 1:08 ` [PATCH v3 bpf-next 12/14] selftests/bpf: Add unit tests for bpf_arena_alloc/free_pages Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 13/14] selftests/bpf: Add bpf_arena_list test Alexei Starovoitov
2024-03-08 1:08 ` [PATCH v3 bpf-next 14/14] selftests/bpf: Add bpf_arena_htab test Alexei Starovoitov
2024-03-11 22:45 ` [PATCH v3 bpf-next 00/14] bpf: Introduce BPF arena Andrii Nakryiko
2024-03-11 23:02 ` Alexei Starovoitov
2024-03-11 22:50 ` patchwork-bot+netdevbpf
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