[PATCH bpf-next v2 04/10] libbpf: Add __PT_PARM1_REG_SYSCALL macro

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Some architectures have a special way to access the first syscall
argument. There already exists __PT_PARM4_REG_SYSCALL for the
fourth argument, so define a similar macro for the first one.

Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
---
 tools/lib/bpf/bpf_tracing.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index 032ba809f3e5..30f0964f8c9e 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -265,7 +265,11 @@ struct pt_regs;
 
 #endif
 
+#ifdef __PT_PARM1_REG_SYSCALL
+#define PT_REGS_PARM1_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG_SYSCALL)
+#else /* __PT_PARM1_REG_SYSCALL */
 #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1(x)
+#endif
 #define PT_REGS_PARM2_SYSCALL(x) PT_REGS_PARM2(x)
 #define PT_REGS_PARM3_SYSCALL(x) PT_REGS_PARM3(x)
 #ifdef __PT_PARM4_REG_SYSCALL
@@ -275,7 +279,11 @@ struct pt_regs;
 #endif
 #define PT_REGS_PARM5_SYSCALL(x) PT_REGS_PARM5(x)
 
+#ifdef __PT_PARM1_REG_SYSCALL
+#define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG_SYSCALL)
+#else /* __PT_PARM1_REG_SYSCALL */
 #define PT_REGS_PARM1_CORE_SYSCALL(x) PT_REGS_PARM1_CORE(x)
+#endif
 #define PT_REGS_PARM2_CORE_SYSCALL(x) PT_REGS_PARM2_CORE(x)
 #define PT_REGS_PARM3_CORE_SYSCALL(x) PT_REGS_PARM3_CORE(x)
 #ifdef __PT_PARM4_REG_SYSCALL
-- 
2.34.1




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