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bpf: sparc64: Add JIT support for multi-function programs. 

Modelled strongly upon the arm64 implementation.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
David Miller 2017-12-22 09:42:41 -05:00 committed by Daniel Borkmann
parent c475ffad58
commit 5f5a641116
1 changed files with 40 additions and 4 deletions
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44
arch/sparc/net/bpf_jit_comp_64.c
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@ -1507,11 +1507,19 @@ static void jit_fill_hole(void *area, unsigned int size)
*ptr++ = 0x91d02005; /* ta 5 */
}
struct sparc64_jit_data {
struct bpf_binary_header *header;
u8 *image;
struct jit_ctx ctx;
};
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
struct bpf_prog *tmp, *orig_prog = prog;
struct sparc64_jit_data *jit_data;
struct bpf_binary_header *header;
bool tmp_blinded = false;
bool extra_pass = false;
struct jit_ctx ctx;
u32 image_size;
u8 *image_ptr;
@ -1531,13 +1539,31 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
prog = tmp;
}
jit_data = prog->aux->jit_data;
if (!jit_data) {
jit_data = kzalloc(sizeof(*jit_data), GFP_KERNEL);
if (!jit_data) {
prog = orig_prog;
goto out;
}
prog->aux->jit_data = jit_data;
}
if (jit_data->ctx.offset) {
ctx = jit_data->ctx;
image_ptr = jit_data->image;
header = jit_data->header;
extra_pass = true;
image_size = sizeof(u32) * ctx.idx;
goto skip_init_ctx;
}
memset(&ctx, 0, sizeof(ctx));
ctx.prog = prog;
ctx.offset = kcalloc(prog->len, sizeof(unsigned int), GFP_KERNEL);
if (ctx.offset == NULL) {
prog = orig_prog;
goto out;
goto out_off;
}
/* Fake pass to detect features used, and get an accurate assessment
@ -1560,7 +1586,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
}
ctx.image = (u32 *)image_ptr;
skip_init_ctx:
for (pass = 1; pass < 3; pass++) {
ctx.idx = 0;
@ -1591,14 +1617,24 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
bpf_flush_icache(header, (u8 *)header + (header->pages * PAGE_SIZE));
bpf_jit_binary_lock_ro(header);
if (!prog->is_func || extra_pass) {
bpf_jit_binary_lock_ro(header);
} else {
jit_data->ctx = ctx;
jit_data->image = image_ptr;
jit_data->header = header;
}
prog->bpf_func = (void *)ctx.image;
prog->jited = 1;
prog->jited_len = image_size;
if (!prog->is_func || extra_pass) {
out_off:
kfree(ctx.offset);
kfree(ctx.offset);
kfree(jit_data);
prog->aux->jit_data = NULL;
}
out:
if (tmp_blinded)
bpf_jit_prog_release_other(prog, prog == orig_prog ?