powerpc/bpf/32: BPF prog is never called with more than one arg

BPF progs are never called with more than one argument, plus the
tail call count as a second argument when needed.

So, no need to retrieve 9th and 10th argument (5th 64 bits argument)
from the stack in prologue.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/89a200fb45048601475c092c5775294dee3886de.1675245773.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c
index 7f54d37..7c129fe 100644 (file)
--- a/arch/powerpc/net/bpf_jit_comp32.c
+++ b/arch/powerpc/net/bpf_jit_comp32.c
@@ -159,12 +159,6 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx)
                if (bpf_is_seen_register(ctx, i))
                        EMIT(PPC_RAW_STW(i, _R1, bpf_jit_stack_offsetof(ctx, i)));
 
-       /* If needed retrieve arguments 9 and 10, ie 5th 64 bits arg.*/
-       if (bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_5))) {
-               EMIT(PPC_RAW_LWZ(bpf_to_ppc(BPF_REG_5) - 1, _R1, BPF_PPC_STACKFRAME(ctx)) + 8);
-               EMIT(PPC_RAW_LWZ(bpf_to_ppc(BPF_REG_5), _R1, BPF_PPC_STACKFRAME(ctx)) + 12);
-       }
-
        /* Setup frame pointer to point to the bpf stack area */
        if (bpf_is_seen_register(ctx, bpf_to_ppc(BPF_REG_FP))) {
                EMIT(PPC_RAW_LI(bpf_to_ppc(BPF_REG_FP) - 1, 0));