From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 21 Feb 2022 16:41:53 +0000 (-0700)
Subject: aarch64: add system call definitions
X-Git-Tag: fio-3.30~34
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=e9d0f70a57d00e96e8dd80d53eee38b8cc829164;p=fio.git

aarch64: add system call definitions

Avoid a libc function call, just define our own syscall wrappers for
this architecture. Lifted from liburing.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/arch/arch-aarch64.h b/arch/arch-aarch64.h
index 94571709..951d1718 100644
--- a/arch/arch-aarch64.h
+++ b/arch/arch-aarch64.h
@@ -44,4 +44,81 @@ static inline int arch_init(char *envp[])
 	return 0;
 }
 
+#define __do_syscallN(...) ({						\
+	__asm__ volatile (						\
+		"svc 0"							\
+		: "=r"(x0)						\
+		: __VA_ARGS__						\
+		: "memory", "cc");					\
+	(long) x0;							\
+})
+
+#define __do_syscall0(__n) ({						\
+	register long x8 __asm__("x8") = __n;				\
+	register long x0 __asm__("x0");					\
+									\
+	__do_syscallN("r" (x8));					\
+})
+
+#define __do_syscall1(__n, __a) ({					\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0));				\
+})
+
+#define __do_syscall2(__n, __a, __b) ({					\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+	register __typeof__(__b) x1 __asm__("x1") = __b;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0), "r" (x1));			\
+})
+
+#define __do_syscall3(__n, __a, __b, __c) ({				\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+	register __typeof__(__b) x1 __asm__("x1") = __b;		\
+	register __typeof__(__c) x2 __asm__("x2") = __c;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0), "r" (x1), "r" (x2));		\
+})
+
+#define __do_syscall4(__n, __a, __b, __c, __d) ({			\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+	register __typeof__(__b) x1 __asm__("x1") = __b;		\
+	register __typeof__(__c) x2 __asm__("x2") = __c;		\
+	register __typeof__(__d) x3 __asm__("x3") = __d;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0), "r" (x1), "r" (x2), "r" (x3));\
+})
+
+#define __do_syscall5(__n, __a, __b, __c, __d, __e) ({			\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+	register __typeof__(__b) x1 __asm__("x1") = __b;		\
+	register __typeof__(__c) x2 __asm__("x2") = __c;		\
+	register __typeof__(__d) x3 __asm__("x3") = __d;		\
+	register __typeof__(__e) x4 __asm__("x4") = __e;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0), "r" (x1), "r" (x2), "r" (x3),	\
+			"r"(x4));					\
+})
+
+#define __do_syscall6(__n, __a, __b, __c, __d, __e, __f) ({		\
+	register long x8 __asm__("x8") = __n;				\
+	register __typeof__(__a) x0 __asm__("x0") = __a;		\
+	register __typeof__(__b) x1 __asm__("x1") = __b;		\
+	register __typeof__(__c) x2 __asm__("x2") = __c;		\
+	register __typeof__(__d) x3 __asm__("x3") = __d;		\
+	register __typeof__(__e) x4 __asm__("x4") = __e;		\
+	register __typeof__(__f) x5 __asm__("x5") = __f;		\
+									\
+	__do_syscallN("r" (x8), "0" (x0), "r" (x1), "r" (x2), "r" (x3),	\
+			"r" (x4), "r"(x5));				\
+})
+
+#define FIO_ARCH_HAS_SYSCALL
+
 #endif