use glibc syscall (David Woodhouse)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1966 c046a42c-6fe2-441c-8c8c-71466251a162

2 files changed, 38 insertions, 103 deletions

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 4afc6d888c..3ce55f903c 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -79,127 +79,59 @@
 #define	VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct dirent [2])
 
 
-#if defined(__powerpc__)
-#undef __syscall_nr
-#undef __sc_loadargs_0
-#undef __sc_loadargs_1
-#undef __sc_loadargs_2
-#undef __sc_loadargs_3
-#undef __sc_loadargs_4
-#undef __sc_loadargs_5
-#undef __sc_asm_input_0
-#undef __sc_asm_input_1
-#undef __sc_asm_input_2
-#undef __sc_asm_input_3
-#undef __sc_asm_input_4
-#undef __sc_asm_input_5
 #undef _syscall0
 #undef _syscall1
 #undef _syscall2
 #undef _syscall3
 #undef _syscall4
 #undef _syscall5
+#undef _syscall6
 
-/* need to redefine syscalls as Linux kernel defines are incorrect for
-   the clobber list */
-/* On powerpc a system call basically clobbers the same registers like a
- * function call, with the exception of LR (which is needed for the
- * "sc; bnslr" sequence) and CR (where only CR0.SO is clobbered to signal
- * an error return status).
- */
+#define _syscall0(type,name)		\
+type name (void)			\
+{					\
+	return syscall(__NR_##name);	\
+}
 
-#define __syscall_nr(nr, type, name, args...)				\
-	unsigned long __sc_ret, __sc_err;				\
-	{								\
-		register unsigned long __sc_0  __asm__ ("r0");		\
-		register unsigned long __sc_3  __asm__ ("r3");		\
-		register unsigned long __sc_4  __asm__ ("r4");		\
-		register unsigned long __sc_5  __asm__ ("r5");		\
-		register unsigned long __sc_6  __asm__ ("r6");		\
-		register unsigned long __sc_7  __asm__ ("r7");		\
-									\
-		__sc_loadargs_##nr(name, args);				\
-		__asm__ __volatile__					\
-			("sc           \n\t"				\
-			 "mfcr %0      "				\
-			: "=&r" (__sc_0),				\
-			  "=&r" (__sc_3),  "=&r" (__sc_4),		\
-			  "=&r" (__sc_5),  "=&r" (__sc_6),		\
-			  "=&r" (__sc_7)				\
-			: __sc_asm_input_##nr				\
-			: "cr0", "ctr", "memory",			\
-			  "r8", "r9", "r10","r11", "r12");		\
-		__sc_ret = __sc_3;					\
-		__sc_err = __sc_0;					\
-	}								\
-	if (__sc_err & 0x10000000)					\
-	{								\
-		errno = __sc_ret;					\
-		__sc_ret = -1;						\
-	}								\
-	return (type) __sc_ret
-
-#define __sc_loadargs_0(name, dummy...)					\
-	__sc_0 = __NR_##name
-#define __sc_loadargs_1(name, arg1)					\
-	__sc_loadargs_0(name);						\
-	__sc_3 = (unsigned long) (arg1)
-#define __sc_loadargs_2(name, arg1, arg2)				\
-	__sc_loadargs_1(name, arg1);					\
-	__sc_4 = (unsigned long) (arg2)
-#define __sc_loadargs_3(name, arg1, arg2, arg3)				\
-	__sc_loadargs_2(name, arg1, arg2);				\
-	__sc_5 = (unsigned long) (arg3)
-#define __sc_loadargs_4(name, arg1, arg2, arg3, arg4)			\
-	__sc_loadargs_3(name, arg1, arg2, arg3);			\
-	__sc_6 = (unsigned long) (arg4)
-#define __sc_loadargs_5(name, arg1, arg2, arg3, arg4, arg5)		\
-	__sc_loadargs_4(name, arg1, arg2, arg3, arg4);			\
-	__sc_7 = (unsigned long) (arg5)
-
-#define __sc_asm_input_0 "0" (__sc_0)
-#define __sc_asm_input_1 __sc_asm_input_0, "1" (__sc_3)
-#define __sc_asm_input_2 __sc_asm_input_1, "2" (__sc_4)
-#define __sc_asm_input_3 __sc_asm_input_2, "3" (__sc_5)
-#define __sc_asm_input_4 __sc_asm_input_3, "4" (__sc_6)
-#define __sc_asm_input_5 __sc_asm_input_4, "5" (__sc_7)
-
-#define _syscall0(type,name)						\
-type name(void)								\
-{									\
-	__syscall_nr(0, type, name);					\
+#define _syscall1(type,name,type1,arg1)		\
+type name (type1 arg1)				\
+{						\
+	return syscall(__NR_##name, arg1);	\
 }
 
-#define _syscall1(type,name,type1,arg1)					\
-type name(type1 arg1)							\
-{									\
-	__syscall_nr(1, type, name, arg1);				\
+#define _syscall2(type,name,type1,arg1,type2,arg2)	\
+type name (type1 arg1,type2 arg2)			\
+{							\
+	return syscall(__NR_##name, arg1, arg2);	\
 }
 
-#define _syscall2(type,name,type1,arg1,type2,arg2)			\
-type name(type1 arg1, type2 arg2)					\
-{									\
-	__syscall_nr(2, type, name, arg1, arg2);			\
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)	\
+type name (type1 arg1,type2 arg2,type3 arg3)			\
+{								\
+	return syscall(__NR_##name, arg1, arg2, arg3);		\
 }
 
-#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)		\
-type name(type1 arg1, type2 arg2, type3 arg3)				\
-{									\
-	__syscall_nr(3, type, name, arg1, arg2, arg3);			\
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)	\
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4)				\
+{										\
+	return syscall(__NR_##name, arg1, arg2, arg3, arg4);			\
 }
 
-#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
-type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4)		\
-{									\
-	__syscall_nr(4, type, name, arg1, arg2, arg3, arg4);		\
+#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,	\
+		  type5,arg5)							\
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)		\
+{										\
+	return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5);		\
 }
 
-#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
-type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)	\
-{									\
-	__syscall_nr(5, type, name, arg1, arg2, arg3, arg4, arg5);	\
+
+#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,	\
+		  type5,arg5,type6,arg6)					\
+type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6)	\
+{										\
+	return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6);	\
 }
-#endif
+
 
 #define __NR_sys_uname __NR_uname
 #define __NR_sys_getcwd1 __NR_getcwd
diff --git a/target-i386/helper2.c b/target-i386/helper2.c
index 9d5d9b564e..ac7d0568b2 100644
--- a/target-i386/helper2.c
+++ b/target-i386/helper2.c
@@ -35,7 +35,10 @@
 #include <linux/unistd.h>
 #include <linux/version.h>
 
-_syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount)
+int modify_ldt(int func, void *ptr, unsigned long bytecount)
+{
+	return syscall(__NR_modify_ldt, func, ptr, bytecount);
+}
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 66)
 #define modify_ldt_ldt_s user_desc