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[bpf-next,1/8] arm32, bpf: add support for 32-bit offset jmp instruction

Message ID 20230905210621.1711859-2-puranjay12@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series arm32, bpf: add support for cpuv4 insns | expand

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bpf/vmtest-bpf-next-VM_Test-24 success Logs for test_verifier on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-25 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-26 success Logs for test_verifier on x86_64 with gcc
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bpf/vmtest-bpf-next-PR fail PR summary
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bpf/vmtest-bpf-next-VM_Test-7 success Logs for test_maps on s390x with gcc
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/cc_maintainers warning 1 maintainers not CCed: linux-arm-kernel@lists.infradead.org
netdev/build_clang success Errors and warnings before: 9 this patch: 9
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 9 this patch: 9
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 17 lines checked
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netdev/source_inline success Was 0 now: 0

Commit Message

Puranjay Mohan Sept. 5, 2023, 9:06 p.m. UTC 
The cpuv4 adds unconditional jump with 32-bit offset where the immediate
field of the instruction is to be used to calculate the jump offset.

BPF_JA | BPF_K | BPF_JMP32 => gotol +imm => PC += imm.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
---
 arch/arm/net/bpf_jit_32.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Comments

Russell King (Oracle) Sept. 5, 2023, 9:11 p.m. UTC | #1 
On Tue, Sep 05, 2023 at 09:06:14PM +0000, Puranjay Mohan wrote:
> The cpuv4 adds unconditional jump with 32-bit offset where the immediate
> field of the instruction is to be used to calculate the jump offset.
> 
> BPF_JA | BPF_K | BPF_JMP32 => gotol +imm => PC += imm.
> 
> Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
> ---
>  arch/arm/net/bpf_jit_32.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
> index 6a1c9fca5260..b26579da770e 100644
> --- a/arch/arm/net/bpf_jit_32.c
> +++ b/arch/arm/net/bpf_jit_32.c
> @@ -1761,10 +1761,15 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
>  		break;
>  	/* JMP OFF */
>  	case BPF_JMP | BPF_JA:
> +	case BPF_JMP32 | BPF_JA:
>  	{
> -		if (off == 0)
> +		if (BPF_CLASS(code) == BPF_JMP32 && imm != 0)
> +			jmp_offset = bpf2a32_offset(i + imm, i, ctx);
> +		else if (BPF_CLASS(code) == BPF_JMP &&  off != 0)

Please tidy up the coding style - one space between "&&" and "off"

Thanks.
diff mbox series

Patch

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 6a1c9fca5260..b26579da770e 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -1761,10 +1761,15 @@  static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
 		break;
 	/* JMP OFF */
 	case BPF_JMP | BPF_JA:
+	case BPF_JMP32 | BPF_JA:
 	{
-		if (off == 0)
+		if (BPF_CLASS(code) == BPF_JMP32 && imm != 0)
+			jmp_offset = bpf2a32_offset(i + imm, i, ctx);
+		else if (BPF_CLASS(code) == BPF_JMP &&  off != 0)
+			jmp_offset = bpf2a32_offset(i + off, i, ctx);
+		else
 			break;
-		jmp_offset = bpf2a32_offset(i+off, i, ctx);
+
 		check_imm24(jmp_offset);
 		emit(ARM_B(jmp_offset), ctx);
 		break;