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author | Zi Shen Lim <zlim.lnx@gmail.com> | 2016-06-08 21:18:48 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2016-06-10 23:11:49 -0700 |
commit | ddb55992b04d9749e7c00af7f855e4e13566a521 (patch) | |
tree | d618bcb2e7502391d4d0e29672001babf738fd84 /crypto/twofish_common.c | |
parent | 002245cc6407c8ff65b8024554080eb6de1a8e2c (diff) | |
download | linux-ddb55992b04d9749e7c00af7f855e4e13566a521.tar.bz2 |
arm64: bpf: implement bpf_tail_call() helper
Add support for JMP_CALL_X (tail call) introduced by commit 04fd61ab36ec
("bpf: allow bpf programs to tail-call other bpf programs").
bpf_tail_call() arguments:
ctx - context pointer passed to next program
array - pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY
index - index inside array that selects specific program to run
In this implementation arm64 JIT jumps into callee program after prologue,
so callee program reuses the same stack. For tail_call_cnt, we use the
callee-saved R26 (which was already saved/restored but previously unused
by JIT).
With this patch a tail call generates the following code on arm64:
if (index >= array->map.max_entries)
goto out;
34: mov x10, #0x10 // #16
38: ldr w10, [x1,x10]
3c: cmp w2, w10
40: b.ge 0x0000000000000074
if (tail_call_cnt > MAX_TAIL_CALL_CNT)
goto out;
tail_call_cnt++;
44: mov x10, #0x20 // #32
48: cmp x26, x10
4c: b.gt 0x0000000000000074
50: add x26, x26, #0x1
prog = array->ptrs[index];
if (prog == NULL)
goto out;
54: mov x10, #0x68 // #104
58: ldr x10, [x1,x10]
5c: ldr x11, [x10,x2]
60: cbz x11, 0x0000000000000074
goto *(prog->bpf_func + prologue_size);
64: mov x10, #0x20 // #32
68: ldr x10, [x11,x10]
6c: add x10, x10, #0x20
70: br x10
74:
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto/twofish_common.c')
0 files changed, 0 insertions, 0 deletions