bpf: Add sparc support to tools and samples.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Author: davem330

samples/bpf/bpf_helpers.h

@@ -146,11 +146,30 @@ static int (*bpf_skb_change_head)(void *, int len, int flags) =
 #define PT_REGS_SP(x) ((x)->sp)
 #define PT_REGS_IP(x) ((x)->nip)
 
+#elif defined(__sparc__)
+
+#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
+#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
+#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
+#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
+#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
+#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
+#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
+#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
+#if defined(__arch64__)
+#define PT_REGS_IP(x) ((x)->tpc)
+#else
+#define PT_REGS_IP(x) ((x)->pc)
+#endif
+
 #endif
 
 #ifdef __powerpc__
 #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = (ctx)->link; })
 #define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
+#elif defined(__sparc__)
+#define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = PT_REGS_RET(ctx); })
+#define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
 #else
 #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({				\
 		bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })

tools/build/feature/test-bpf.c

@@ -9,6 +9,9 @@
 #  define __NR_bpf 321
 # elif defined(__aarch64__)
 #  define __NR_bpf 280
+# elif defined(__sparc__)
+#  define __NR_bpf 349
+# else
 #  error __NR_bpf not defined. libbpf does not support your arch.
 # endif
 #endif

tools/lib/bpf/bpf.c

@@ -37,6 +37,8 @@
 #  define __NR_bpf 321
 # elif defined(__aarch64__)
 #  define __NR_bpf 280
+# elif defined(__sparc__)
+#  define __NR_bpf 349
 # else
 #  error __NR_bpf not defined. libbpf does not support your arch.
 # endif