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