This draws from an old patch by David Blythe for the now-dead

unified syscall interface.  I reworked his old patch considerably
and cleaned up his version of bits/syscalls.h with some sneaky macro
magic.  And I implemented a powerpc correct version of pread/pwrite
 -Erik

libc/sysdeps/linux/powerpc/Makefile

@@ -37,10 +37,10 @@ CRT0=crt0.S
 CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0))
 endif
 
-SSRC=__longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S clone.S
+SSRC=__longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S clone.S __uClibc_syscall.S
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
-CSRC=_mmap.c vfork.c __syscall_error.c
+CSRC=_mmap.c vfork.c __syscall_error.c pread_write.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 
 OBJS=$(SOBJS) $(MOBJ) $(COBJS)

libc/sysdeps/linux/powerpc/__uClibc_syscall.S

@@ -0,0 +1,14 @@
+.section ".text"
+	.align 2
+.globl __uClibc_syscall
+	.type	__uClibc_syscall,@function
+__uClibc_syscall:
+.Lsize:
+	sc
+	bnslr
+#ifdef __PIC__
+	b	__syscall_error@plt
+#else
+	b	__syscall_error
+#endif
+	.size	__uClibc_syscall,.Lsize-__uClibc_syscall

libc/sysdeps/linux/powerpc/_mmap.c

@@ -1,9 +1,14 @@
 
 #include <unistd.h>
 #include <sys/mman.h>
-#include <sys/syscall.h>
 #include <errno.h>
+#include <sys/syscall.h>
 
+#define __syscall_clobbers \
+	"r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+#define __syscall_return(type) \
+	return (__sc_err & 0x10000000 ? errno = __sc_ret, __sc_ret = -1 : 0), \
+	       (type) __sc_ret
 
 void * mmap(void *start, size_t length, int prot, int flags, int fd,
 	off_t offset)

libc/sysdeps/linux/powerpc/bits/syscalls.h

@@ -1,60 +1,71 @@
 #ifndef _BITS_SYSCALLS_H
 #define _BITS_SYSCALLS_H
+
 #ifndef _SYSCALL_H
 # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
 #endif
 
-#include <features.h>
-
-/* Do something very evil for now.  Until we create our own syscall
- * macros, short circuit bits/sysnum.h  and use asm/unistd.h instead */
-#include <asm/unistd.h>
-
 /* This includes the `__NR_<name>' syscall numbers taken from the Linux kernel
  * header files.  It also defines the traditional `SYS_<name>' macros for older
  * programs.  */
 #include <bits/sysnum.h>
 
-/* The kernel includes don't provide _syscall6, so provide our own */
-#undef _syscall6
-#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)	\
-{									\
-	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");		\
-		register unsigned long __sc_8 __asm__ ("r8");		\
-									\
-		__sc_3 = (unsigned long) (arg1);			\
-		__sc_4 = (unsigned long) (arg2);			\
-		__sc_5 = (unsigned long) (arg3);			\
-		__sc_6 = (unsigned long) (arg4);			\
-		__sc_7 = (unsigned long) (arg5);			\
-		__sc_8 = (unsigned long) (arg6);			\
-		__sc_0 = __NR_##name;					\
-		__asm__ __volatile__					\
-			("sc           \n\t"				\
-			 "mfcr %1      "				\
-			: "=&r" (__sc_3), "=&r" (__sc_0)		\
-			: "0"   (__sc_3), "1"   (__sc_0),		\
-			  "r"   (__sc_4),				\
-			  "r"   (__sc_5),				\
-			  "r"   (__sc_6),				\
-			  "r"   (__sc_7),				\
-			  "r"   (__sc_8)				\
-			: __syscall_clobbers);				\
-		__sc_ret = __sc_3;					\
-		__sc_err = __sc_0;					\
-	}								\
-	__syscall_return (type);					\
-}
 
+#define STRINGIFY(s) STRINGIFY2 (s)
+#define STRINGIFY2(s) #s
+
+#ifdef __PIC__
+#define JUMPTARGET(name) STRINGIFY(name##@plt)
+#else
+#define JUMPTARGET(name) STRINGIFY(name)
+#endif
+
+#define unified_syscall_body(name)			\
+	__asm__ (					\
+	".section \".text\"\n\t"			\
+	".align 2\n\t"					\
+	".globl "###name"\n\t"				\
+	".type "###name",@function\n"			\
+	#name":\n\tli 0," STRINGIFY(__NR_##name) "\n\t"	\
+	"b "JUMPTARGET(__uClibc_syscall)"\n"		\
+	".Lfe1"###name":\n\t"				\
+	".size\t"###name ",.Lfe1"###name"-"###name"\n"	\
+	)
 
+#undef _syscall0
+#define _syscall0(type,name)						\
+type name(void);							\
+unified_syscall_body(name)
+
+#undef _syscall1
+#define _syscall1(type,name,type1,arg1) \
+type name(type1 arg1);  \
+unified_syscall_body(name)
+
+#undef _syscall2
+#define _syscall2(type,name,type1,arg1,type2,arg2) \
+type name(type1 arg1, type2 arg2);      \
+unified_syscall_body(name)
+
+#undef _syscall3
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
+type name(type1 arg1, type2 arg2, type3 arg3);  \
+unified_syscall_body(name)
+
+#undef _syscall4
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
+type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4);      \
+unified_syscall_body(name)
+
+#undef _syscall5
+#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);  \
+unified_syscall_body(name)
+
+#undef _syscall6
+#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);      \
+unified_syscall_body(name)
 
 #endif /* _BITS_SYSCALLS_H */
 

libc/sysdeps/linux/powerpc/pread_write.c

@@ -0,0 +1,193 @@
+/* vi: set sw=4 ts=4:
+ *
+ * Copyright (C) 2002 by Erik Andersen <andersen@uclibc.org>
+ * Based in part on the files
+ *		./sysdeps/unix/sysv/linux/pwrite.c,
+ *		./sysdeps/unix/sysv/linux/pread.c, 
+ *		sysdeps/posix/pread.c
+ *		sysdeps/posix/pwrite.c
+ * from GNU libc 2.2.5, but reworked considerably...
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#define _GNU_SOURCE
+#define _LARGEFILE64_SOURCE
+#include <features.h>
+#undef __OPTIMIZE__
+/* We absolutely do _NOT_ want interfaces silently
+ *  *  * renamed under us or very bad things will happen... */
+#ifdef __USE_FILE_OFFSET64
+# undef __USE_FILE_OFFSET64
+#endif
+
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#ifdef __NR_pread
+#define __NR___syscall_pread __NR_pread 
+static inline _syscall4(ssize_t, __syscall_pread, int, fd, 
+		void *, buf, size_t, count, off64_t, offset);
+
+ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset)
+{ 
+	return(__syscall_pread(fd, buf, count, (off64_t)offset));
+}
+weak_alias (__libc_pread, pread)
+
+#if defined __UCLIBC_HAS_LFS__ 
+ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
+{ 
+	return(__syscall_pread(fd, buf, count, offset));
+}
+weak_alias (__libc_pread64, pread64)
+#endif /* __UCLIBC_HAS_LFS__  */
+#endif /* __NR_pread */
+
+
+#ifdef __NR_pwrite
+#define __NR___syscall_pwrite __NR_pwrite 
+static inline _syscall4(ssize_t, __syscall_pwrite, int, fd, 
+		const void *, buf, size_t, count, off64_t, offset);
+
+ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset)
+{ 
+	return(__syscall_pwrite(fd, buf, count, (off64_t)offset));
+}
+weak_alias (__libc_pwrite, pwrite)
+
+#if defined __UCLIBC_HAS_LFS__ 
+ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
+{ 
+	return(__syscall_pwrite(fd, buf, count, offset));
+}
+weak_alias (__libc_pwrite64, pwrite64)
+#endif /* __UCLIBC_HAS_LFS__  */
+#endif /* __NR_pwrite */
+
+
+
+#if ! defined __NR_pread || ! defined __NR_pwrite
+static ssize_t __fake_pread_write(int fd, void *buf, 
+		size_t count, off_t offset, int do_pwrite)
+{
+	int save_errno;
+	ssize_t result;
+	off_t old_offset;
+
+	/* Since we must not change the file pointer preserve the 
+	 * value so that we can restore it later.  */
+	if ((old_offset=lseek(fd, 0, SEEK_CUR)) == (off_t) -1)
+		return -1;
+
+	/* Set to wanted position.  */
+	if (lseek (fd, offset, SEEK_SET) == (off_t) -1)
+		return -1;
+
+	if (do_pwrite==1) {
+		/* Write the data.  */
+		result = write(fd, buf, count);
+	} else {
+		/* Read the data.  */
+		result = read(fd, buf, count);
+	}
+
+	/* Now we have to restore the position.  If this fails we 
+	 * have to return this as an error.  */
+	save_errno = errno;
+	if (lseek(fd, old_offset, SEEK_SET) == (off_t) -1)
+	{
+		if (result == -1)
+			__set_errno(save_errno);
+		return -1;
+	}
+	__set_errno(save_errno);
+	return(result);
+}
+
+#if defined __UCLIBC_HAS_LFS__ 
+static ssize_t __fake_pread_write64(int fd, void *buf, 
+		size_t count, off64_t offset, int do_pwrite)
+{
+	int save_errno;
+	ssize_t result;
+	off64_t old_offset;
+
+	/* Since we must not change the file pointer preserve the 
+	 * value so that we can restore it later.  */
+	if ((old_offset=lseek64(fd, 0, SEEK_CUR)) == (off64_t) -1)
+		return -1;
+
+	/* Set to wanted position.  */
+	if (lseek64(fd, offset, SEEK_SET) == (off64_t) -1) 
+		return -1;                               
+
+	if (do_pwrite==1) {
+		/* Write the data.  */
+		result = write(fd, buf, count);
+	} else {
+		/* Read the data.  */
+		result = read(fd, buf, count);
+	}
+
+	/* Now we have to restore the position. */
+	save_errno = errno;
+	if (lseek64 (fd, old_offset, SEEK_SET) == (off64_t) -1) {
+		if (result == -1)
+			__set_errno (save_errno);
+		return -1;
+	}
+	__set_errno (save_errno);
+	return result;
+}
+#endif /* __UCLIBC_HAS_LFS__  */
+#endif /*  ! defined __NR_pread || ! defined __NR_pwrite */
+
+#ifndef __NR_pread
+ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset)
+{
+	return(__fake_pread_write(fd, buf, count, offset, 0));
+}
+weak_alias (__libc_pread, pread)
+
+#if defined __UCLIBC_HAS_LFS__ 
+ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
+{ 
+	return(__fake_pread_write64(fd, buf, count, offset, 0));
+}
+weak_alias (__libc_pread64, pread64)
+#endif /* __UCLIBC_HAS_LFS__  */
+#endif /* ! __NR_pread */
+
+
+#ifndef __NR_pwrite
+ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset)
+{
+	return(__fake_pread_write(fd, buf, count, offset, 1));
+}
+weak_alias (__libc_pwrite, pwrite)
+
+#if defined __UCLIBC_HAS_LFS__ 
+ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
+{ 
+	return(__fake_pread_write64(fd, (void*)buf, count, offset, 1));
+}
+weak_alias (__libc_pwrite64, pwrite64)
+#endif /* __UCLIBC_HAS_LFS__  */
+#endif /* ! __NR_pwrite */
+

libc/sysdeps/linux/powerpc/vfork.c

@@ -1,9 +1,14 @@
 
 #include <unistd.h>
-#include <sys/syscall.h>
 #include <sys/types.h>
 #include <errno.h>
+#include <sys/syscall.h>
 
+#define __syscall_clobbers \
+	"r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12"
+#define __syscall_return(type) \
+	return (__sc_err & 0x10000000 ? errno = __sc_ret, __sc_ret = -1 : 0), \
+	       (type) __sc_ret
 
 int vfork(void)
 {