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authorEric Andersen <andersen@codepoet.org>2002-11-15 14:12:12 +0000
committerEric Andersen <andersen@codepoet.org>2002-11-15 14:12:12 +0000
commit82a975f2f2671f0fb54ccc56d3cc621dad8b645b (patch)
tree39ad2c87c1a4da6419ddc49638f3c599882e79b4
parent80b0b55af2faa2e314d61d2f17fc24c9cfa94a34 (diff)
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
-rw-r--r--libc/sysdeps/linux/powerpc/Makefile4
-rw-r--r--libc/sysdeps/linux/powerpc/__uClibc_syscall.S14
-rw-r--r--libc/sysdeps/linux/powerpc/_mmap.c7
-rw-r--r--libc/sysdeps/linux/powerpc/bits/syscalls.h99
-rw-r--r--libc/sysdeps/linux/powerpc/pread_write.c193
-rw-r--r--libc/sysdeps/linux/powerpc/vfork.c7
6 files changed, 276 insertions, 48 deletions
diff --git a/libc/sysdeps/linux/powerpc/Makefile b/libc/sysdeps/linux/powerpc/Makefile
index 2cf67849d..d765c78e9 100644
--- a/libc/sysdeps/linux/powerpc/Makefile
+++ b/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)
diff --git a/libc/sysdeps/linux/powerpc/__uClibc_syscall.S b/libc/sysdeps/linux/powerpc/__uClibc_syscall.S
new file mode 100644
index 000000000..09bfb89cc
--- /dev/null
+++ b/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
diff --git a/libc/sysdeps/linux/powerpc/_mmap.c b/libc/sysdeps/linux/powerpc/_mmap.c
index a229181e0..350f4c49e 100644
--- a/libc/sysdeps/linux/powerpc/_mmap.c
+++ b/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)
diff --git a/libc/sysdeps/linux/powerpc/bits/syscalls.h b/libc/sysdeps/linux/powerpc/bits/syscalls.h
index 6b11315e2..f2a1b6da4 100644
--- a/libc/sysdeps/linux/powerpc/bits/syscalls.h
+++ b/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 */
diff --git a/libc/sysdeps/linux/powerpc/pread_write.c b/libc/sysdeps/linux/powerpc/pread_write.c
new file mode 100644
index 000000000..e9dd36680
--- /dev/null
+++ b/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 */
+
diff --git a/libc/sysdeps/linux/powerpc/vfork.c b/libc/sysdeps/linux/powerpc/vfork.c
index fcf020804..750255be9 100644
--- a/libc/sysdeps/linux/powerpc/vfork.c
+++ b/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)
{