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55 lines
1.5 KiB
55 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* BPF Jit compiler defines |
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* |
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* Copyright IBM Corp. 2012,2015 |
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* |
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* Author(s): Martin Schwidefsky <[email protected]> |
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* Michael Holzheu <[email protected]> |
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*/ |
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#ifndef __ARCH_S390_NET_BPF_JIT_H |
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#define __ARCH_S390_NET_BPF_JIT_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/filter.h> |
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#include <linux/types.h> |
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#endif /* __ASSEMBLY__ */ |
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/* |
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* Stackframe layout (packed stack): |
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* |
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* ^ high |
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* +---------------+ | |
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* | old backchain | | |
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* +---------------+ | |
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* | r15 - r6 | | |
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* +---------------+ | |
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* | 4 byte align | | |
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* | tail_call_cnt | | |
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* BFP -> +===============+ | |
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* | | | |
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* | BPF stack | | |
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* | | | |
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* R15+160 -> +---------------+ | |
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* | new backchain | | |
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* R15+152 -> +---------------+ | |
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* | + 152 byte SA | | |
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* R15 -> +---------------+ + low |
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* |
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* We get 160 bytes stack space from calling function, but only use |
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* 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. |
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* |
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* The stack size used by the BPF program ("BPF stack" above) is passed |
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* via "aux->stack_depth". |
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*/ |
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#define STK_SPACE_ADD (160) |
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#define STK_160_UNUSED (160 - 12 * 8) |
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#define STK_OFF (STK_SPACE_ADD - STK_160_UNUSED) |
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#define STK_OFF_R6 (160 - 11 * 8) /* Offset of r6 on stack */ |
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#define STK_OFF_TCCNT (160 - 12 * 8) /* Offset of tail_call_cnt on stack */ |
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#endif /* __ARCH_S390_NET_BPF_JIT_H */
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