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bpf: Fix BSWAP 32 and 16 on MIPS64

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The 16/32-bit byteswap implementations for MIPS64r1 and earlier do
not have an explicit zero extension afterwards. The input is first
sign-extended to 64 bits, and the byteswap sequence can then leave
the result sign-extended depending on the value of the low bits.

Add the missing zero-extension.

Found with test_bpf on MIPS64r1 emulated by QEMU.

Fixes: fbc802de6b ("mips, bpf: Add new eBPF JIT for 64-bit MIPS")
Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20260923105158.3514342-2-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2026-09-23 12:51:58 +02:00 committed by Alexei Starovoitov
parent db762fd96b
commit 8110ba0977
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1 changed files with 1 additions and 2 deletions
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arch/mips/net/bpf_jit_comp64.c
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@ -305,8 +305,7 @@ static void emit_bswap_r64(struct jit_context *ctx, u8 dst, u32 width)
case 16:
emit_sext(ctx, dst, dst);
emit_bswap_r(ctx, dst, width);
if (cpu_has_mips64r2 || cpu_has_mips64r6)
emit_zext(ctx, dst);
emit_zext(ctx, dst);
break;
}
clobber_reg(ctx, dst);