riscv64: add system call definitions

Signed-off-by: Michal Biesek <michalbiesek@gmail.com>
axboe · Aug 23, 2023 · 6ca246c · 6ca246c
1 parent 4a0c766
commit 6ca246c
Showing 1 changed file with 86 additions and 0 deletions.
diff --git a/arch/arch-riscv64.h b/arch/arch-riscv64.h
@@ -29,4 +29,90 @@ static inline int arch_init(char *envp[])
  return 0;
 }
 
+#define __do_syscallM(...) ({ \
+ __asm__ volatile ( \
+ "ecall" \
+ : "=r"(a0) \
+ : __VA_ARGS__ \
+ : "memory", "a1"); \
+ (long) a0; \
+})
+
+#define __do_syscallN(...) ({ \
+ __asm__ volatile ( \
+ "ecall" \
+ : "=r"(a0) \
+ : __VA_ARGS__ \
+ : "memory"); \
+ (long) a0; \
+})
+
+#define __do_syscall0(__n) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register long a0 __asm__("a0"); \
+ \
+ __do_syscallM("r" (a7)); \
+})
+
+#define __do_syscall1(__n, __a) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ \
+ __do_syscallM("r" (a7), "0" (a0)); \
+})
+
+#define __do_syscall2(__n, __a, __b) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ register __typeof__(__b) a1 __asm__("a1") = __b; \
+ \
+ __do_syscallN("r" (a7), "0" (a0), "r" (a1)); \
+})
+
+#define __do_syscall3(__n, __a, __b, __c) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ register __typeof__(__b) a1 __asm__("a1") = __b; \
+ register __typeof__(__c) a2 __asm__("a2") = __c; \
+ \
+ __do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2)); \
+})
+
+#define __do_syscall4(__n, __a, __b, __c, __d) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ register __typeof__(__b) a1 __asm__("a1") = __b; \
+ register __typeof__(__c) a2 __asm__("a2") = __c; \
+ register __typeof__(__d) a3 __asm__("a3") = __d; \
+ \
+ __do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3));\
+})
+
+#define __do_syscall5(__n, __a, __b, __c, __d, __e) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ register __typeof__(__b) a1 __asm__("a1") = __b; \
+ register __typeof__(__c) a2 __asm__("a2") = __c; \
+ register __typeof__(__d) a3 __asm__("a3") = __d; \
+ register __typeof__(__e) a4 __asm__("a4") = __e; \
+ \
+ __do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3), \
+ "r"(a4)); \
+})
+
+#define __do_syscall6(__n, __a, __b, __c, __d, __e, __f) ({ \
+ register long a7 __asm__("a7") = __n; \
+ register __typeof__(__a) a0 __asm__("a0") = __a; \
+ register __typeof__(__b) a1 __asm__("a1") = __b; \
+ register __typeof__(__c) a2 __asm__("a2") = __c; \
+ register __typeof__(__d) a3 __asm__("a3") = __d; \
+ register __typeof__(__e) a4 __asm__("a4") = __e; \
+ register __typeof__(__f) a5 __asm__("a5") = __f; \
+ \
+ __do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3), \
+ "r" (a4), "r"(a5)); \
+})
+
+#define FIO_ARCH_HAS_SYSCALL
+
 #endif