| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * BPF Jit compiler defines |
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| 4 | * |
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| 5 | * Copyright IBM Corp. 2012,2015 |
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| 6 | * |
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| 7 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> |
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| 8 | * Michael Holzheu <holzheu@linux.vnet.ibm.com> |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef __ARCH_S390_NET_BPF_JIT_H |
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| 12 | #define __ARCH_S390_NET_BPF_JIT_H |
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| 13 | |
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| 14 | #ifndef __ASSEMBLY__ |
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| 15 | |
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| 16 | #include <linux/filter.h> |
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| 17 | #include <linux/types.h> |
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| 18 | |
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| 19 | #endif /* __ASSEMBLY__ */ |
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| 20 | |
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| 21 | /* |
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| 22 | * Stackframe layout (packed stack): |
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| 23 | * |
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| 24 | * ^ high |
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| 25 | * +---------------+ | |
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| 26 | * | old backchain | | |
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| 27 | * +---------------+ | |
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| 28 | * | r15 - r6 | | |
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| 29 | * +---------------+ | |
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| 30 | * | 4 byte align | | |
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| 31 | * | tail_call_cnt | | |
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| 32 | * BFP -> +===============+ | |
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| 33 | * | | | |
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| 34 | * | BPF stack | | |
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| 35 | * | | | |
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| 36 | * R15+160 -> +---------------+ | |
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| 37 | * | new backchain | | |
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| 38 | * R15+152 -> +---------------+ | |
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| 39 | * | + 152 byte SA | | |
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| 40 | * R15 -> +---------------+ + low |
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| 41 | * |
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| 42 | * We get 160 bytes stack space from calling function, but only use |
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| 43 | * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. |
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| 44 | * |
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| 45 | * The stack size used by the BPF program ("BPF stack" above) is passed |
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| 46 | * via "aux->stack_depth". |
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| 47 | */ |
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| 48 | #define STK_SPACE_ADD (160) |
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| 49 | #define STK_160_UNUSED (160 - 12 * 8) |
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| 50 | #define STK_OFF (STK_SPACE_ADD - STK_160_UNUSED) |
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| 51 | |
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| 52 | #define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ |
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| 53 | #define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ |
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| 54 | |
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| 55 | #endif /* __ARCH_S390_NET_BPF_JIT_H */ |
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| 56 | |
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