forked from luck/tmp_suning_uos_patched
bbac1c9488
On s390x we have to provide 160 bytes stack space before we can call
the next function. From the 160 bytes that we got from the previous
function we only use 11 * 8 bytes and have 160 - 11 * 8 bytes left.
Currently for BPF we allocate additional 160 - 11 * 8 bytes for the
next function. This is wrong because then the next function only gets:
(160 - 11 * 8) + (160 - 11 * 8) = 2 * 72 = 144 bytes
Fix this and allocate enough memory for the next function.
Fixes: 0546231057 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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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 <schwidefsky@de.ibm.com>
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* Michael Holzheu <holzheu@linux.vnet.ibm.com>
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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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extern u8 sk_load_word_pos[], sk_load_half_pos[], sk_load_byte_pos[];
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extern u8 sk_load_word[], sk_load_half[], sk_load_byte[];
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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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* BFP -> +===============+ |
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* | | |
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* | BPF stack | |
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* | | |
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* +---------------+ |
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* | 8 byte hlen | |
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* R15+168 -> +---------------+ |
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* | 4 byte align | |
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* +---------------+ |
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* | 4 byte temp | |
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* | for bpf_jit.S | |
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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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* 11 * 8 byte (old backchain + r15 - r6) for storing registers.
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*/
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#define STK_SPACE (MAX_BPF_STACK + 8 + 4 + 4 + 160)
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#define STK_160_UNUSED (160 - 11 * 8)
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#define STK_OFF (STK_SPACE - STK_160_UNUSED)
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#define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */
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#define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */
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/* Offset to skip condition code check */
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#define OFF_OK 4
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#endif /* __ARCH_S390_NET_BPF_JIT_H */
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