samples/bpf: Enable powerpc support
Add the necessary definitions for building bpf samples on ppc. Since ppc doesn't store function return address on the stack, modify how PT_REGS_RET() and PT_REGS_FP() work. Also, introduce PT_REGS_IP() to access the instruction pointer. Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David S. Miller <davem@davemloft.net> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -82,6 +82,7 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
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#define PT_REGS_FP(x) ((x)->bp)
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#define PT_REGS_RC(x) ((x)->ax)
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->ip)
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#elif defined(__s390x__)
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@ -94,6 +95,7 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
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#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->gprs[2])
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#define PT_REGS_SP(x) ((x)->gprs[15])
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#define PT_REGS_IP(x) ((x)->ip)
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#elif defined(__aarch64__)
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@ -106,6 +108,30 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
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#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->regs[0])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->pc)
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#elif defined(__powerpc__)
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#define PT_REGS_PARM1(x) ((x)->gpr[3])
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#define PT_REGS_PARM2(x) ((x)->gpr[4])
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#define PT_REGS_PARM3(x) ((x)->gpr[5])
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#define PT_REGS_PARM4(x) ((x)->gpr[6])
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#define PT_REGS_PARM5(x) ((x)->gpr[7])
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#define PT_REGS_RC(x) ((x)->gpr[3])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->nip)
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#endif
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#ifdef __powerpc__
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
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#else
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
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#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), \
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(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
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#endif
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#endif
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@ -34,7 +34,7 @@ struct bpf_map_def SEC("maps") stackmap = {
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#define PROG(foo) \
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int foo(struct pt_regs *ctx) \
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{ \
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long v = ctx->ip, *val; \
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long v = PT_REGS_IP(ctx), *val; \
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\
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val = bpf_map_lookup_elem(&my_map, &v); \
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bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
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@ -27,10 +27,10 @@ int bpf_prog2(struct pt_regs *ctx)
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long init_val = 1;
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long *value;
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/* x64/s390x specific: read ip of kfree_skb caller.
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/* read ip of kfree_skb caller.
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* non-portable version of __builtin_return_address(0)
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*/
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bpf_probe_read(&loc, sizeof(loc), (void *)PT_REGS_RET(ctx));
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BPF_KPROBE_READ_RET_IP(loc, ctx);
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value = bpf_map_lookup_elem(&my_map, &loc);
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if (value)
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@ -40,7 +40,7 @@ int bpf_prog2(struct pt_regs *ctx)
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long ip = 0;
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/* get ip address of kmem_cache_alloc_node() caller */
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bpf_probe_read(&ip, sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip)));
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BPF_KRETPROBE_READ_RET_IP(ip, ctx);
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struct pair v = {
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.val = bpf_ktime_get_ns(),
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