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