Thu Aug 1 14:40:03 1996 Roland McGrath <roland@fast.cs.utah.edu>
authorroland <roland>
Fri, 2 Aug 1996 04:52:44 +0000 (04:52 +0000)
committerroland <roland>
Fri, 2 Aug 1996 04:52:44 +0000 (04:52 +0000)
* sysdeps/i386/sysdep.h: Do `#include_next <sysdep.h>'.
* sysdeps/i386/sysdep.h: New file, broken out of ...
* sysdeps/unix/i386/sysdep.h: ... here.  Generic asm macros moved out.

sysdeps/i386/sysdep.h [new file with mode: 0644]

diff --git a/sysdeps/i386/sysdep.h b/sysdeps/i386/sysdep.h
new file mode 100644 (file)
index 0000000..0c207ba
--- /dev/null
@@ -0,0 +1,91 @@
+/* Assembler macros for i386.
+Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library 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.
+
+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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include_next <sysdep.h>
+
+#ifdef ASSEMBLER
+
+/* Syntactic details of assembler.  */
+
+#ifdef HAVE_ELF
+
+/* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
+#define ALIGNARG(log2) 1<<log2
+/* For ELF we need the `.type' directive to make shared libs work right.  */
+#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
+
+/* In ELF C symbols are asm symbols.  */
+#undef NO_UNDERSCORES
+#define NO_UNDERSCORES
+
+#else
+
+#define ALIGNARG(log2) log2
+#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified.  */
+
+#endif
+
+
+/* Define an entry point visible from C.  */
+#define        ENTRY(name)                                                           \
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                  \
+  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                         \
+  .align ALIGNARG(4);                                                        \
+  C_LABEL(name)                                                                      \
+  CALL_MCOUNT
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef PROF
+/* The mcount code relies on a normal frame pointer being on the stack
+   to locate our caller, so push one just for its benefit.  */
+#define CALL_MCOUNT \
+  pushl %ebp; movl %esp, %ebp; call JUMPTARGET(mcount); popl %ebp;
+#else
+#define CALL_MCOUNT            /* Do nothing.  */
+#endif
+
+#ifdef NO_UNDERSCORES
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define        syscall_error   __syscall_error
+#define mcount         _mcount
+#endif
+
+#define        PSEUDO(name, syscall_name, args)                                      \
+lose: SYSCALL_PIC_SETUP                                                              \
+  jmp JUMPTARGET(syscall_error)                                                      \
+  .globl syscall_error;                                                              \
+  ENTRY (name)                                                               \
+  DO_CALL (syscall_name, args);                                                      \
+  jb lose
+
+#ifdef PIC
+#define JUMPTARGET(name)       name##@PLT
+#define SYSCALL_PIC_SETUP \
+    pushl %ebx;                                                                      \
+    call 0f;                                                                 \
+0:  popl %ebx;                                                               \
+    addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
+#else
+#define JUMPTARGET(name)       name
+#define SYSCALL_PIC_SETUP      /* Nothing.  */
+#endif
+
+#endif /* ASSEMBLER */