fix riscv64 syscall asm constraint

[musl] / arch / riscv64 / syscall_arch.h

diff --git a/arch/riscv64/syscall_arch.h b/arch/riscv64/syscall_arch.h
index 1aaeb63..3e0804e 100644 (file)
--- a/arch/riscv64/syscall_arch.h
+++ b/arch/riscv64/syscall_arch.h
@@ -3,7 +3,7 @@
 
 #define __asm_syscall(...) \
        __asm__ __volatile__ ("ecall\n\t" \
-       : "+r"(a0) : __VA_ARGS__ : "memory"); \
+       : "=r"(a0) : __VA_ARGS__ : "memory"); \
        return a0; \
 
 static inline long __syscall0(long n)