diff options
Diffstat (limited to 'arch/powerpc/net/bpf_jit64.h')
| -rw-r--r-- | arch/powerpc/net/bpf_jit64.h | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/arch/powerpc/net/bpf_jit64.h b/arch/powerpc/net/bpf_jit64.h index 5046d6f..a1645d7 100644 --- a/arch/powerpc/net/bpf_jit64.h +++ b/arch/powerpc/net/bpf_jit64.h @@ -16,22 +16,25 @@ /* * Stack layout: + * Ensure the top half (upto local_tmp_var) stays consistent + * with our redzone usage. * * [ prev sp ] <------------- * [ nv gpr save area ] 8*8 | + * [ tail_call_cnt ] 8 | + * [ local_tmp_var ] 8 | * fp (r31) --> [ ebpf stack space ] 512 | - * [ local/tmp var space ] 16 | * [ frame header ] 32/112 | * sp (r1) ---> [ stack pointer ] -------------- */ -/* for bpf JIT code internal usage */ -#define BPF_PPC_STACK_LOCALS 16 /* for gpr non volatile registers BPG_REG_6 to 10, plus skb cache registers */ #define BPF_PPC_STACK_SAVE (8*8) +/* for bpf JIT code internal usage */ +#define BPF_PPC_STACK_LOCALS 16 /* Ensure this is quadword aligned */ -#define BPF_PPC_STACKFRAME (STACK_FRAME_MIN_SIZE + BPF_PPC_STACK_LOCALS + \ - MAX_BPF_STACK + BPF_PPC_STACK_SAVE) +#define BPF_PPC_STACKFRAME (STACK_FRAME_MIN_SIZE + MAX_BPF_STACK + \ + BPF_PPC_STACK_LOCALS + BPF_PPC_STACK_SAVE) #ifndef __ASSEMBLY__ @@ -65,6 +68,9 @@ static const int b2p[] = { [TMP_REG_2] = 10 }; +/* PPC NVR range -- update this if we ever use NVRs below r24 */ +#define BPF_PPC_NVR_MIN 24 + /* Assembly helpers */ #define DECLARE_LOAD_FUNC(func) u64 func(u64 r3, u64 r4); \ u64 func##_negative_offset(u64 r3, u64 r4); \ |
