powerpc/bpf/jit: Isolate classic BPF JIT specifics into a separate header
Break out classic BPF JIT specifics into a separate header in
preparation for eBPF JIT implementation. Note that ppc32 will still need
the classic BPF JIT.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index 9041d3f..313cfaf 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -1,4 +1,5 @@
-/* bpf_jit.h: BPF JIT compiler for PPC64
+/*
+ * bpf_jit.h: BPF JIT compiler for PPC
*
* Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation
*
@@ -10,66 +11,8 @@
#ifndef _BPF_JIT_H
#define _BPF_JIT_H
-#ifdef CONFIG_PPC64
-#define BPF_PPC_STACK_R3_OFF 48
-#define BPF_PPC_STACK_LOCALS 32
-#define BPF_PPC_STACK_BASIC (48+64)
-#define BPF_PPC_STACK_SAVE (18*8)
-#define BPF_PPC_STACKFRAME (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
- BPF_PPC_STACK_SAVE)
-#define BPF_PPC_SLOWPATH_FRAME (48+64)
-#else
-#define BPF_PPC_STACK_R3_OFF 24
-#define BPF_PPC_STACK_LOCALS 16
-#define BPF_PPC_STACK_BASIC (24+32)
-#define BPF_PPC_STACK_SAVE (18*4)
-#define BPF_PPC_STACKFRAME (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
- BPF_PPC_STACK_SAVE)
-#define BPF_PPC_SLOWPATH_FRAME (24+32)
-#endif
-
-#define REG_SZ (BITS_PER_LONG/8)
-
-/*
- * Generated code register usage:
- *
- * As normal PPC C ABI (e.g. r1=sp, r2=TOC), with:
- *
- * skb r3 (Entry parameter)
- * A register r4
- * X register r5
- * addr param r6
- * r7-r10 scratch
- * skb->data r14
- * skb headlen r15 (skb->len - skb->data_len)
- * m[0] r16
- * m[...] ...
- * m[15] r31
- */
-#define r_skb 3
-#define r_ret 3
-#define r_A 4
-#define r_X 5
-#define r_addr 6
-#define r_scratch1 7
-#define r_scratch2 8
-#define r_D 14
-#define r_HL 15
-#define r_M 16
-
#ifndef __ASSEMBLY__
-/*
- * Assembly helpers from arch/powerpc/net/bpf_jit.S:
- */
-#define DECLARE_LOAD_FUNC(func) \
- extern u8 func[], func##_negative_offset[], func##_positive_offset[]
-
-DECLARE_LOAD_FUNC(sk_load_word);
-DECLARE_LOAD_FUNC(sk_load_half);
-DECLARE_LOAD_FUNC(sk_load_byte);
-DECLARE_LOAD_FUNC(sk_load_byte_msh);
-
#ifdef CONFIG_PPC64
#define FUNCTION_DESCR_SIZE 24
#else
@@ -131,46 +74,6 @@
#define PPC_BPF_STLU(r, base, i) do { PPC_STWU(r, base, i); } while(0)
#endif
-/* Convenience helpers for the above with 'far' offsets: */
-#define PPC_LBZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LBZ(r, base, i); \
- else { PPC_ADDIS(r, base, IMM_HA(i)); \
- PPC_LBZ(r, r, IMM_L(i)); } } while(0)
-
-#define PPC_LD_OFFS(r, base, i) do { if ((i) < 32768) PPC_LD(r, base, i); \
- else { PPC_ADDIS(r, base, IMM_HA(i)); \
- PPC_LD(r, r, IMM_L(i)); } } while(0)
-
-#define PPC_LWZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LWZ(r, base, i); \
- else { PPC_ADDIS(r, base, IMM_HA(i)); \
- PPC_LWZ(r, r, IMM_L(i)); } } while(0)
-
-#define PPC_LHZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LHZ(r, base, i); \
- else { PPC_ADDIS(r, base, IMM_HA(i)); \
- PPC_LHZ(r, r, IMM_L(i)); } } while(0)
-
-#ifdef CONFIG_PPC64
-#define PPC_LL_OFFS(r, base, i) do { PPC_LD_OFFS(r, base, i); } while(0)
-#else
-#define PPC_LL_OFFS(r, base, i) do { PPC_LWZ_OFFS(r, base, i); } while(0)
-#endif
-
-#ifdef CONFIG_SMP
-#ifdef CONFIG_PPC64
-#define PPC_BPF_LOAD_CPU(r) \
- do { BUILD_BUG_ON(FIELD_SIZEOF(struct paca_struct, paca_index) != 2); \
- PPC_LHZ_OFFS(r, 13, offsetof(struct paca_struct, paca_index)); \
- } while (0)
-#else
-#define PPC_BPF_LOAD_CPU(r) \
- do { BUILD_BUG_ON(FIELD_SIZEOF(struct thread_info, cpu) != 4); \
- PPC_LHZ_OFFS(r, (1 & ~(THREAD_SIZE - 1)), \
- offsetof(struct thread_info, cpu)); \
- } while(0)
-#endif
-#else
-#define PPC_BPF_LOAD_CPU(r) do { PPC_LI(r, 0); } while(0)
-#endif
-
#define PPC_CMPWI(a, i) EMIT(PPC_INST_CMPWI | ___PPC_RA(a) | IMM_L(i))
#define PPC_CMPDI(a, i) EMIT(PPC_INST_CMPDI | ___PPC_RA(a) | IMM_L(i))
#define PPC_CMPLWI(a, i) EMIT(PPC_INST_CMPLWI | ___PPC_RA(a) | IMM_L(i))
@@ -273,14 +176,6 @@
#define PPC_FUNC_ADDR(d,i) do { PPC_LI32(d, i); } while(0)
#endif
-#define PPC_LHBRX_OFFS(r, base, i) \
- do { PPC_LI32(r, i); PPC_LHBRX(r, r, base); } while(0)
-#ifdef __LITTLE_ENDIAN__
-#define PPC_NTOHS_OFFS(r, base, i) PPC_LHBRX_OFFS(r, base, i)
-#else
-#define PPC_NTOHS_OFFS(r, base, i) PPC_LHZ_OFFS(r, base, i)
-#endif
-
static inline bool is_nearbranch(int offset)
{
return (offset < 32768) && (offset >= -32768);
@@ -317,18 +212,6 @@
#define COND_NE (CR0_EQ | COND_CMP_FALSE)
#define COND_LT (CR0_LT | COND_CMP_TRUE)
-#define SEEN_DATAREF 0x10000 /* might call external helpers */
-#define SEEN_XREG 0x20000 /* X reg is used */
-#define SEEN_MEM 0x40000 /* SEEN_MEM+(1<<n) = use mem[n] for temporary
- * storage */
-#define SEEN_MEM_MSK 0x0ffff
-
-struct codegen_context {
- unsigned int seen;
- unsigned int idx;
- int pc_ret0; /* bpf index of first RET #0 instruction (if any) */
-};
-
#endif
#endif