[RFC PATCH v1 5/7] powerpc/bpf: Change values of SEEN_ flags
From: Christophe Leroy <hidden>
Date: 2020-12-16 10:09:14
Also in:
bpf, lkml, netdev
Subsystem:
bpf jit for powerpc (32-bit and 64-bit), bpf [general] (safe dynamic programs and tools), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Hari Bathini, Christophe Leroy, Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Because PPC32 will use more non volatile registers, move SEEN_ flags to positions 0-2 which corresponds to special registers. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/net/bpf_jit.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index b34abfce15a6..fb4656986fb9 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h@@ -108,18 +108,18 @@ static inline bool is_nearbranch(int offset) #define COND_LT (CR0_LT | COND_CMP_TRUE) #define COND_LE (CR0_GT | COND_CMP_FALSE) -#define SEEN_FUNC 0x1000 /* might call external helpers */ -#define SEEN_STACK 0x2000 /* uses BPF stack */ -#define SEEN_TAILCALL 0x4000 /* uses tail calls */ +#define SEEN_FUNC 0x20000000 /* might call external helpers */ +#define SEEN_STACK 0x40000000 /* uses BPF stack */ +#define SEEN_TAILCALL 0x80000000 /* uses tail calls */ struct codegen_context { /* * This is used to track register usage as well * as calls to external helpers. * - register usage is tracked with corresponding - * bits (r3-r10 and r27-r31) + * bits (r3-r31) * - rest of the bits can be used to track other - * things -- for now, we use bits 16 to 23 + * things -- for now, we use bits 0 to 2 * encoded in SEEN_* macros above */ unsigned int seen;
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2.25.0