[PATCH v2 5/8] powerpc/bpf: Change values of SEEN_ flags
From: Christophe Leroy <hidden>
Date: 2021-03-22 16:38:35
Also in:
bpf, linuxppc-dev, lkml
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, 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;
--
2.25.0