[PATCH bpf-next] libbpf: Add LoongArch support to bpf_tracing.h

[Hengqi Chen <hengqi.chen@gmail.com>]

Add PT_REGS macros for LoongArch64 ([0]).

  [0]: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
---
 tools/lib/bpf/bpf_tracing.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 2972dc25ff72..5a8a0830d133 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -32,6 +32,9 @@
 #elif defined(__TARGET_ARCH_arc)
 	#define bpf_target_arc
 	#define bpf_target_defined
+#elif defined(__TARGET_ARCH_loongarch)
+	#define bpf_target_loongarch
+	#define bpf_target_defined
 #else

 /* Fall back to what the compiler says */
@@ -62,6 +65,9 @@
 #elif defined(__arc__)
 	#define bpf_target_arc
 	#define bpf_target_defined
+#elif defined(__loongarch__) && __loongarch_grlen == 64
+	#define bpf_target_loongarch
+	#define bpf_target_defined
 #endif /* no compiler target */

 #endif
@@ -258,6 +264,21 @@ struct pt_regs___arm64 {
 /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */
 #define PT_REGS_SYSCALL_REGS(ctx) ctx

+#elif defined(bpf_target_loongarch)
+
+#define __PT_PARM1_REG regs[4]
+#define __PT_PARM2_REG regs[5]
+#define __PT_PARM3_REG regs[6]
+#define __PT_PARM4_REG regs[7]
+#define __PT_PARM5_REG regs[8]
+#define __PT_RET_REG regs[1]
+#define __PT_FP_REG regs[22]
+#define __PT_RC_REG regs[4]
+#define __PT_SP_REG regs[3]
+#define __PT_IP_REG csr_era
+/* loongarch does not select ARCH_HAS_SYSCALL_WRAPPER. */
+#define PT_REGS_SYSCALL_REGS(ctx) ctx
+
 #endif

 #if defined(bpf_target_defined)
--
2.31.1