| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455 |
- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * BPF Jit compiler defines
- *
- * Copyright IBM Corp. 2012,2015
- *
- * Author(s): Martin Schwidefsky <[email protected]>
- * Michael Holzheu <[email protected]>
- */
- #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 */
|
