compile fixes for i386 nptl

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 336 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/i386/sysdep.h b/libc/sysdeps/linux/i386/sysdep.h
new file mode 100644
index 000000000..ffbde7d96
--- /dev/null
+++ b/libc/sysdeps/linux/i386/sysdep.h
@@ -0,0 +1,336 @@
+/* Copyright (C) 1992,1993,1995-2000,2002-2006,2007
+	Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper, <drepper@gnu.org>, August 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _LINUX_I386_SYSDEP_H
+#define _LINUX_I386_SYSDEP_H 1
+
+#include <sys/syscall.h>
+#include <sysdeps/i386/sysdep.h>
+
+#ifndef offsetof
+# define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+/* For Linux we can use the system call table in the header file
+	/usr/include/asm/unistd.h
+   of the kernel.  But these symbols do not follow the SYS_* syntax
+   so we have to redefine the `SYS_ify' macro here.  */
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+#if defined USE_DL_SYSINFO \
+    && (!defined NOT_IN_libc || defined IS_IN_libpthread)
+# define I386_USE_SYSENTER	1
+#else
+# undef I386_USE_SYSENTER
+#endif
+
+#ifdef __ASSEMBLER__
+
+/* Linux uses a negative return value to indicate syscall errors,
+   unlike most Unices, which use the condition codes' carry flag.
+
+   Since version 2.1 the return value of a system call might be
+   negative even if the call succeeded.  E.g., the `lseek' system call
+   might return a large offset.  Therefore we must not anymore test
+   for < 0, but test for a real error by making sure the value in %eax
+   is a real error number.  Linus said he will make sure the no syscall
+   returns a value in -1 .. -4095 as a valid result so we can savely
+   test with -4095.  */
+
+/* We don't want the label for the error handle to be global when we define
+   it here.  */
+#ifdef __PIC__
+# define SYSCALL_ERROR_LABEL 0f
+#else
+# define SYSCALL_ERROR_LABEL syscall_error
+#endif
+
+#undef	PSEUDO
+#define	PSEUDO(name, syscall_name, args)				      \
+  .text;								      \
+  ENTRY (name)								      \
+    DO_CALL (syscall_name, args);					      \
+    cmpl $-4095, %eax;							      \
+    jae SYSCALL_ERROR_LABEL;						      \
+  L(pseudo_end):
+
+#undef	PSEUDO_END
+#define	PSEUDO_END(name)						      \
+  SYSCALL_ERROR_HANDLER							      \
+  END (name)
+
+#undef	PSEUDO_NOERRNO
+#define	PSEUDO_NOERRNO(name, syscall_name, args)			      \
+  .text;								      \
+  ENTRY (name)								      \
+    DO_CALL (syscall_name, args)
+
+#undef	PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name)					      \
+  END (name)
+
+#define ret_NOERRNO ret
+
+/* The function has to return the error code.  */
+#undef	PSEUDO_ERRVAL
+#define	PSEUDO_ERRVAL(name, syscall_name, args) \
+  .text;								      \
+  ENTRY (name)								      \
+    DO_CALL (syscall_name, args);					      \
+    negl %eax
+
+#undef	PSEUDO_END_ERRVAL
+#define	PSEUDO_END_ERRVAL(name) \
+  END (name)
+
+#define ret_ERRVAL ret
+
+#ifndef __PIC__
+# define SYSCALL_ERROR_HANDLER	/* Nothing here; code in sysdep.S is used.  */
+#else
+
+# ifdef RTLD_PRIVATE_ERRNO
+#  define SYSCALL_ERROR_HANDLER						      \
+0:SETUP_PIC_REG(cx);							      \
+  addl $_GLOBAL_OFFSET_TABLE_, %ecx;					      \
+  xorl %edx, %edx;							      \
+  subl %eax, %edx;							      \
+  movl %edx, rtld_errno@GOTOFF(%ecx);					      \
+  orl $-1, %eax;							      \
+  jmp L(pseudo_end);
+
+# elif defined _LIBC_REENTRANT
+
+#  if USE___THREAD
+#   ifndef NOT_IN_libc
+#    define SYSCALL_ERROR_ERRNO __libc_errno
+#   else
+#    define SYSCALL_ERROR_ERRNO errno
+#   endif
+#   define SYSCALL_ERROR_HANDLER					      \
+0:SETUP_PIC_REG (cx);							      \
+  addl $_GLOBAL_OFFSET_TABLE_, %ecx;					      \
+  movl SYSCALL_ERROR_ERRNO@GOTNTPOFF(%ecx), %ecx;			      \
+  xorl %edx, %edx;							      \
+  subl %eax, %edx;							      \
+  SYSCALL_ERROR_HANDLER_TLS_STORE (%edx, %ecx);				      \
+  orl $-1, %eax;							      \
+  jmp L(pseudo_end);
+#   ifndef NO_TLS_DIRECT_SEG_REFS
+#    define SYSCALL_ERROR_HANDLER_TLS_STORE(src, destoff)		      \
+  movl src, %gs:(destoff)
+#   else
+#    define SYSCALL_ERROR_HANDLER_TLS_STORE(src, destoff)		      \
+  addl %gs:0, destoff;							      \
+  movl src, (destoff)
+#   endif
+#  else
+#   define SYSCALL_ERROR_HANDLER					      \
+0:pushl %ebx;								      \
+  cfi_adjust_cfa_offset (4);						      \
+  cfi_rel_offset (ebx, 0);						      \
+  SETUP_PIC_REG (bx);							      \
+  addl $_GLOBAL_OFFSET_TABLE_, %ebx;					      \
+  xorl %edx, %edx;							      \
+  subl %eax, %edx;							      \
+  pushl %edx;								      \
+  cfi_adjust_cfa_offset (4);						      \
+  call __errno_location@PLT;					              \
+  popl %ecx;								      \
+  cfi_adjust_cfa_offset (-4);						      \
+  popl %ebx;								      \
+  cfi_adjust_cfa_offset (-4);						      \
+  cfi_restore (ebx);							      \
+  movl %ecx, (%eax);							      \
+  orl $-1, %eax;							      \
+  jmp L(pseudo_end);
+/* A quick note: it is assumed that the call to `__errno_location' does
+   not modify the stack!  */
+#  endif
+# else
+/* Store (- %eax) into errno through the GOT.  */
+#  define SYSCALL_ERROR_HANDLER						      \
+0:SETUP_PIC_REG(cx);							      \
+  addl $_GLOBAL_OFFSET_TABLE_, %ecx;					      \
+  xorl %edx, %edx;							      \
+  subl %eax, %edx;							      \
+  movl errno@GOT(%ecx), %ecx;						      \
+  movl %edx, (%ecx);							      \
+  orl $-1, %eax;							      \
+  jmp L(pseudo_end);
+# endif	/* _LIBC_REENTRANT */
+#endif	/* __PIC__ */
+
+
+/* The original calling convention for system calls on Linux/i386 is
+   to use int $0x80.  */
+#ifdef I386_USE_SYSENTER
+# ifdef SHARED
+#  define ENTER_KERNEL call *%gs:SYSINFO_OFFSET
+# else
+#  define ENTER_KERNEL call *_dl_sysinfo
+# endif
+#else
+# define ENTER_KERNEL int $0x80
+#endif
+
+/* Linux takes system call arguments in registers:
+
+	syscall number	%eax	     call-clobbered
+	arg 1		%ebx	     call-saved
+	arg 2		%ecx	     call-clobbered
+	arg 3		%edx	     call-clobbered
+	arg 4		%esi	     call-saved
+	arg 5		%edi	     call-saved
+	arg 6		%ebp	     call-saved
+
+   The stack layout upon entering the function is:
+
+	24(%esp)	Arg# 6
+	20(%esp)	Arg# 5
+	16(%esp)	Arg# 4
+	12(%esp)	Arg# 3
+	 8(%esp)	Arg# 2
+	 4(%esp)	Arg# 1
+	  (%esp)	Return address
+
+   (Of course a function with say 3 arguments does not have entries for
+   arguments 4, 5, and 6.)
+
+   The following code tries hard to be optimal.  A general assumption
+   (which is true according to the data books I have) is that
+
+	2 * xchg	is more expensive than	pushl + movl + popl
+
+   Beside this a neat trick is used.  The calling conventions for Linux
+   tell that among the registers used for parameters %ecx and %edx need
+   not be saved.  Beside this we may clobber this registers even when
+   they are not used for parameter passing.
+
+   As a result one can see below that we save the content of the %ebx
+   register in the %edx register when we have less than 3 arguments
+   (2 * movl is less expensive than pushl + popl).
+
+   Second unlike for the other registers we don't save the content of
+   %ecx and %edx when we have more than 1 and 2 registers resp.
+
+   The code below might look a bit long but we have to take care for
+   the pipelined processors (i586).  Here the `pushl' and `popl'
+   instructions are marked as NP (not pairable) but the exception is
+   two consecutive of these instruction.  This gives no penalty on
+   other processors though.  */
+
+#undef	DO_CALL
+#define DO_CALL(syscall_name, args)			      		      \
+    PUSHARGS_##args							      \
+    DOARGS_##args							      \
+    movl $SYS_ify (syscall_name), %eax;					      \
+    ENTER_KERNEL							      \
+    POPARGS_##args
+
+#define PUSHARGS_0	/* No arguments to push.  */
+#define	DOARGS_0	/* No arguments to frob.  */
+#define	POPARGS_0	/* No arguments to pop.  */
+#define	_PUSHARGS_0	/* No arguments to push.  */
+#define _DOARGS_0(n)	/* No arguments to frob.  */
+#define	_POPARGS_0	/* No arguments to pop.  */
+
+#define PUSHARGS_1	movl %ebx, %edx; L(SAVEBX1): PUSHARGS_0
+#define	DOARGS_1	_DOARGS_1 (4)
+#define	POPARGS_1	POPARGS_0; movl %edx, %ebx; L(RESTBX1):
+#define	_PUSHARGS_1	pushl %ebx; cfi_adjust_cfa_offset (4); \
+			cfi_rel_offset (ebx, 0); L(PUSHBX1): _PUSHARGS_0
+#define _DOARGS_1(n)	movl n(%esp), %ebx; _DOARGS_0(n-4)
+#define	_POPARGS_1	_POPARGS_0; popl %ebx; cfi_adjust_cfa_offset (-4); \
+			cfi_restore (ebx); L(POPBX1):
+
+#define PUSHARGS_2	PUSHARGS_1
+#define	DOARGS_2	_DOARGS_2 (8)
+#define	POPARGS_2	POPARGS_1
+#define _PUSHARGS_2	_PUSHARGS_1
+#define	_DOARGS_2(n)	movl n(%esp), %ecx; _DOARGS_1 (n-4)
+#define	_POPARGS_2	_POPARGS_1
+
+#define PUSHARGS_3	_PUSHARGS_2
+#define DOARGS_3	_DOARGS_3 (16)
+#define POPARGS_3	_POPARGS_3
+#define _PUSHARGS_3	_PUSHARGS_2
+#define _DOARGS_3(n)	movl n(%esp), %edx; _DOARGS_2 (n-4)
+#define _POPARGS_3	_POPARGS_2
+
+#define PUSHARGS_4	_PUSHARGS_4
+#define DOARGS_4	_DOARGS_4 (24)
+#define POPARGS_4	_POPARGS_4
+#define _PUSHARGS_4	pushl %esi; cfi_adjust_cfa_offset (4); \
+			cfi_rel_offset (esi, 0); L(PUSHSI1): _PUSHARGS_3
+#define _DOARGS_4(n)	movl n(%esp), %esi; _DOARGS_3 (n-4)
+#define _POPARGS_4	_POPARGS_3; popl %esi; cfi_adjust_cfa_offset (-4); \
+			cfi_restore (esi); L(POPSI1):
+
+#define PUSHARGS_5	_PUSHARGS_5
+#define DOARGS_5	_DOARGS_5 (32)
+#define POPARGS_5	_POPARGS_5
+#define _PUSHARGS_5	pushl %edi; cfi_adjust_cfa_offset (4); \
+			cfi_rel_offset (edi, 0); L(PUSHDI1): _PUSHARGS_4
+#define _DOARGS_5(n)	movl n(%esp), %edi; _DOARGS_4 (n-4)
+#define _POPARGS_5	_POPARGS_4; popl %edi; cfi_adjust_cfa_offset (-4); \
+			cfi_restore (edi); L(POPDI1):
+
+#define PUSHARGS_6	_PUSHARGS_6
+#define DOARGS_6	_DOARGS_6 (40)
+#define POPARGS_6	_POPARGS_6
+#define _PUSHARGS_6	pushl %ebp; cfi_adjust_cfa_offset (4); \
+			cfi_rel_offset (ebp, 0); L(PUSHBP1): _PUSHARGS_5
+#define _DOARGS_6(n)	movl n(%esp), %ebp; _DOARGS_5 (n-4)
+#define _POPARGS_6	_POPARGS_5; popl %ebp; cfi_adjust_cfa_offset (-4); \
+			cfi_restore (ebp); L(POPBP1):
+
+#endif	/* __ASSEMBLER__ */
+
+
+/* Pointer mangling support.  */
+#if defined NOT_IN_libc && defined IS_IN_rtld
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+   earlier than the descriptor is initialized.  Using a global variable
+   is too complicated here since we have no PC-relative addressing mode.  */
+#else
+# ifdef __ASSEMBLER__
+#  define PTR_MANGLE(reg)	xorl %gs:POINTER_GUARD, reg;		      \
+				roll $9, reg
+#  define PTR_DEMANGLE(reg)	rorl $9, reg;				      \
+				xorl %gs:POINTER_GUARD, reg
+# else
+#  define PTR_MANGLE(var)	__asm__ ("xorl %%gs:%c2, %0\n"		      \
+				     "roll $9, %0"			      \
+				     : "=r" (var)			      \
+				     : "0" (var),			      \
+				       "i" (offsetof (tcbhead_t,	      \
+						      pointer_guard)))
+#  define PTR_DEMANGLE(var)	__asm__ ("rorl $9, %0\n"			      \
+				     "xorl %%gs:%c2, %0"		      \
+				     : "=r" (var)			      \
+				     : "0" (var),			      \
+				       "i" (offsetof (tcbhead_t,	      \
+						      pointer_guard)))
+# endif
+#endif
+
+#endif /* linux/i386/sysdep.h */