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samples: bpf: enable trace samples for s390x

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The trace bpf samples do not compile on s390x because they use x86
specific fields from the "pt_regs" structure.

Fix this and access the fields via new PT_REGS macros.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Holzheu
2015-07-06 16:20:07 +02:00
committed by David S. Miller
parent 7baaa9092d
commit d912557b34
6 changed files with 37 additions and 12 deletions
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6
samples/bpf/tracex2_kern.c
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@@ -27,10 +27,10 @@ int bpf_prog2(struct pt_regs *ctx)
long init_val = 1;
long *value;
/* x64 specific: read ip of kfree_skb caller.
/* x64/s390x specific: read ip of kfree_skb caller.
* non-portable version of __builtin_return_address(0)
*/
bpf_probe_read(&loc, sizeof(loc), (void *)ctx->sp);
bpf_probe_read(&loc, sizeof(loc), (void *)PT_REGS_RET(ctx));
value = bpf_map_lookup_elem(&my_map, &loc);
if (value)
@@ -79,7 +79,7 @@ struct bpf_map_def SEC("maps") my_hist_map = {
SEC("kprobe/sys_write")
int bpf_prog3(struct pt_regs *ctx)
{
long write_size = ctx->dx; /* arg3 */
long write_size = PT_REGS_PARM3(ctx);
long init_val = 1;
long *value;
struct hist_key key = {};