From 9d5bfe0b9467fc6f54f564648edbc9676106d08d Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 27 Apr 2001 17:23:26 +0000
Subject: Yet another large update to ld.so.  In this iteration I finally got
 the C based syscalls working, which greatly simplifies what it takes to get
 new architectures running.  -Erik

---
 ldso/ldso/m68k/dl-syscalls.h | 111 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 ldso/ldso/m68k/dl-syscalls.h

(limited to 'ldso/ldso/m68k/dl-syscalls.h')

diff --git a/ldso/ldso/m68k/dl-syscalls.h b/ldso/ldso/m68k/dl-syscalls.h
new file mode 100644
index 000000000..908f5acb3
--- /dev/null
+++ b/ldso/ldso/m68k/dl-syscalls.h
@@ -0,0 +1,111 @@
+#include <linux/types.h>
+#include <asm/unistd.h>
+
+/* Here are the macros which define how this platform makes
+ * system calls.  This particular variant does _not_ set 
+ * errno (note how it is disabled in __syscall_return) since
+ * these will get called before the errno symbol is dynamicly 
+ * linked.
+   by the dynamic linker.  The idea is that we want to be able
+   to call these before the errno symbol is dynamicly linked, so
+   we use our own version here.  Note that we cannot assume any
+   dynamic linking at all, so we cannot return any error codes.
+   We just punt if there is an error. */
+
+#define __syscall_return(type, res) \
+do { \
+	if ((unsigned long)(res) >= (unsigned long)(-125)) { \
+	/* avoid using res which is declared to be in register d0; \
+	   errno might expand to a function call and clobber it.  */ \
+		/* int __err = -(res); \
+		errno = __err; */ \
+		res = -1; \
+	} \
+	return (type) (res); \
+} while (0)
+
+#define _syscall0(type,name) \
+type name(void) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+__asm__ __volatile__ ("trap  #0" \
+                      : "=g" (__res) \
+		      : "0" (__res) \
+		      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall1(type,name,atype,a) \
+type name(atype a) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+register long __a __asm__ ("%d1") = (long)(a); \
+__asm__ __volatile__ ("trap  #0" \
+		      : "=d" (__res) \
+		      : "0" (__res), "d" (__a) \
+		      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall2(type,name,atype,a,btype,b) \
+type name(atype a,btype b) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+register long __a __asm__ ("%d1") = (long)(a); \
+register long __b __asm__ ("%d2") = (long)(b); \
+__asm__ __volatile__ ("trap  #0" \
+		      : "=d" (__res) \
+                      : "0" (__res), "d" (__a), "d" (__b) \
+		      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall3(type,name,atype,a,btype,b,ctype,c) \
+type name(atype a,btype b,ctype c) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+register long __a __asm__ ("%d1") = (long)(a); \
+register long __b __asm__ ("%d2") = (long)(b); \
+register long __c __asm__ ("%d3") = (long)(c); \
+__asm__ __volatile__ ("trap  #0" \
+		      : "=d" (__res) \
+                      : "0" (__res), "d" (__a), "d" (__b), \
+			"d" (__c) \
+		      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall4(type,name,atype,a,btype,b,ctype,c,dtype,d) \
+type name (atype a, btype b, ctype c, dtype d) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+register long __a __asm__ ("%d1") = (long)(a); \
+register long __b __asm__ ("%d2") = (long)(b); \
+register long __c __asm__ ("%d3") = (long)(c); \
+register long __d __asm__ ("%d4") = (long)(d); \
+__asm__ __volatile__ ("trap  #0" \
+                      : "=d" (__res) \
+                      : "0" (__res), "d" (__a), "d" (__b), \
+			"d" (__c), "d" (__d)  \
+		      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall5(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e) \
+type name (atype a,btype b,ctype c,dtype d,etype e) \
+{ \
+register long __res __asm__ ("%d0") = __NR_##name; \
+register long __a __asm__ ("%d1") = (long)(a); \
+register long __b __asm__ ("%d2") = (long)(b); \
+register long __c __asm__ ("%d3") = (long)(c); \
+register long __d __asm__ ("%d4") = (long)(d); \
+register long __e __asm__ ("%d5") = (long)(e); \
+__asm__ __volatile__ ("trap  #0" \
+		      : "=d" (__res) \
+		      : "0" (__res), "d" (__a), "d" (__b), \
+			"d" (__c), "d" (__d), "d" (__e)  \
+                      : "%d0"); \
+__syscall_return(type,__res); \
+}
+
+
-- 
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