mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
e1cf4befa2
Since LD_ABS/LD_IND instructions are now removed from the core and reimplemented through a combination of inlined BPF instructions and a slow-path helper, we can get rid of the complexity from s390x JIT. Tested on s390x instance on LinuxONE. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* 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 */
|