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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * bpf_jit64.h: BPF JIT compiler for PPC64
- *
- * Copyright 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
- * IBM Corporation
- */
- #ifndef _BPF_JIT64_H
- #define _BPF_JIT64_H
- #include "bpf_jit.h"
- /*
- * Stack layout:
- * Ensure the top half (upto local_tmp_var) stays consistent
- * with our redzone usage.
- *
- * [ prev sp ] <-------------
- * [ nv gpr save area ] 5*8 |
- * [ tail_call_cnt ] 8 |
- * [ local_tmp_var ] 16 |
- * fp (r31) --> [ ebpf stack space ] upto 512 |
- * [ frame header ] 32/112 |
- * sp (r1) ---> [ stack pointer ] --------------
- */
- /* for gpr non volatile registers BPG_REG_6 to 10 */
- #define BPF_PPC_STACK_SAVE (5*8)
- /* for bpf JIT code internal usage */
- #define BPF_PPC_STACK_LOCALS 24
- /* stack frame excluding BPF stack, ensure this is quadword aligned */
- #define BPF_PPC_STACKFRAME (STACK_FRAME_MIN_SIZE + \
- BPF_PPC_STACK_LOCALS + BPF_PPC_STACK_SAVE)
- #ifndef __ASSEMBLY__
- /* BPF register usage */
- #define TMP_REG_1 (MAX_BPF_JIT_REG + 0)
- #define TMP_REG_2 (MAX_BPF_JIT_REG + 1)
- /* BPF to ppc register mappings */
- static const int b2p[] = {
- /* function return value */
- [BPF_REG_0] = 8,
- /* function arguments */
- [BPF_REG_1] = 3,
- [BPF_REG_2] = 4,
- [BPF_REG_3] = 5,
- [BPF_REG_4] = 6,
- [BPF_REG_5] = 7,
- /* non volatile registers */
- [BPF_REG_6] = 27,
- [BPF_REG_7] = 28,
- [BPF_REG_8] = 29,
- [BPF_REG_9] = 30,
- /* frame pointer aka BPF_REG_10 */
- [BPF_REG_FP] = 31,
- /* eBPF jit internal registers */
- [BPF_REG_AX] = 2,
- [TMP_REG_1] = 9,
- [TMP_REG_2] = 10
- };
- /* PPC NVR range -- update this if we ever use NVRs below r27 */
- #define BPF_PPC_NVR_MIN 27
- /*
- * WARNING: These can use TMP_REG_2 if the offset is not at word boundary,
- * so ensure that it isn't in use already.
- */
- #define PPC_BPF_LL(r, base, i) do { \
- if ((i) % 4) { \
- EMIT(PPC_RAW_LI(b2p[TMP_REG_2], (i)));\
- EMIT(PPC_RAW_LDX(r, base, \
- b2p[TMP_REG_2])); \
- } else \
- EMIT(PPC_RAW_LD(r, base, i)); \
- } while(0)
- #define PPC_BPF_STL(r, base, i) do { \
- if ((i) % 4) { \
- EMIT(PPC_RAW_LI(b2p[TMP_REG_2], (i)));\
- EMIT(PPC_RAW_STDX(r, base, \
- b2p[TMP_REG_2])); \
- } else \
- EMIT(PPC_RAW_STD(r, base, i)); \
- } while(0)
- #define PPC_BPF_STLU(r, base, i) do { EMIT(PPC_RAW_STDU(r, base, i)); } while(0)
- #define SEEN_FUNC 0x1000 /* might call external helpers */
- #define SEEN_STACK 0x2000 /* uses BPF stack */
- #define SEEN_TAILCALL 0x4000 /* 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)
- * - rest of the bits can be used to track other
- * things -- for now, we use bits 16 to 23
- * encoded in SEEN_* macros above
- */
- unsigned int seen;
- unsigned int idx;
- unsigned int stack_size;
- };
- #endif /* !__ASSEMBLY__ */
- #endif
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