mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-17 14:10:10 +00:00
Sat Feb 10 13:09:03 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* sysdeps/unix/sysv/linux/m68k/brk.c, sysdeps/unix/sysv/linux/m68k/mmap.S, sysdeps/unix/sysv/linux/m68k/select.S, sysdeps/unix/sysv/linux/m68k/sigcontext.h, sysdeps/unix/sysv/linux/m68k/sigreturn.S, sysdeps/unix/sysv/linux/m68k/socket.S, sysdeps/unix/sysv/linux/m68k/syscall.S, sysdeps/unix/sysv/linux/m68k/sysdep.S, sysdeps/unix/sysv/linux/m68k/sysdep.h: New files.
This commit is contained in:
Roland McGrath
parent
9168a08cef
commit
9298f9e195
52
sysdeps/unix/sysv/linux/m68k/brk.c
Normal file
52
sysdeps/unix/sysv/linux/m68k/brk.c
Normal file
@ -0,0 +1,52 @@
|
|||||||
|
/* brk system call for Linux/m68k.
|
||||||
|
Copyright (C) 1996 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 <errno.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
#include <sysdep.h>
|
||||||
|
|
||||||
|
void *__curbrk;
|
||||||
|
|
||||||
|
int
|
||||||
|
__brk (void *addr)
|
||||||
|
{
|
||||||
|
void *newbrk;
|
||||||
|
|
||||||
|
{
|
||||||
|
register long d0 __asm__ ("%d0");
|
||||||
|
|
||||||
|
asm ("move%.l %2, %%d1\n"
|
||||||
|
"trap #0" /* Perform the system call. */
|
||||||
|
: "=d" (d0)
|
||||||
|
: "0" (SYS_ify (brk)), "g" (addr)
|
||||||
|
: "%d0", "%d1");
|
||||||
|
newbrk = (void *) d0;
|
||||||
|
}
|
||||||
|
__curbrk = newbrk;
|
||||||
|
|
||||||
|
if (newbrk < addr)
|
||||||
|
{
|
||||||
|
errno = ENOMEM;
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
weak_alias (__brk, brk)
|
||||||
|
|
||||||
44
sysdeps/unix/sysv/linux/m68k/mmap.S
Normal file
44
sysdeps/unix/sysv/linux/m68k/mmap.S
Normal file
@ -0,0 +1,44 @@
|
|||||||
|
/* Copyright (C) 1996 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 <sysdep.h>
|
||||||
|
|
||||||
|
.text
|
||||||
|
SYSCALL_ERROR_HANDLER
|
||||||
|
|
||||||
|
ENTRY (__mmap)
|
||||||
|
|
||||||
|
move.l #SYS_ify (mmap), %d0 /* System call number in %d0. */
|
||||||
|
|
||||||
|
lea 4(%sp), %a0 /* Address of args is 1st arg. */
|
||||||
|
move.l %a0, %d1
|
||||||
|
|
||||||
|
/* Do the system call trap. */
|
||||||
|
trap #0
|
||||||
|
|
||||||
|
/* Kludge: negative numbers are among the legal return values.
|
||||||
|
If %d0 is between -4096 and 0 then there was an error. */
|
||||||
|
cmp.l #-4096, %d0
|
||||||
|
jhi syscall_error
|
||||||
|
|
||||||
|
/* Successful; return the syscall's value. Copy it to %a0 because
|
||||||
|
mmap is declared to return a pointer. */
|
||||||
|
move.l %d0, %a0
|
||||||
|
rts
|
||||||
|
|
||||||
|
weak_alias (__mmap, mmap)
|
||||||
53
sysdeps/unix/sysv/linux/m68k/select.S
Normal file
53
sysdeps/unix/sysv/linux/m68k/select.S
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
/* Copyright (C) 1996 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., 59 Temple Place - Suite 330,
|
||||||
|
Boston, MA 02111-1307, USA. */
|
||||||
|
|
||||||
|
#include <sysdep.h>
|
||||||
|
#define _ERRNO_H
|
||||||
|
#include <errnos.h>
|
||||||
|
|
||||||
|
/* Linux has two versions of the select system call. The old one expected
|
||||||
|
one argument which must be a pointer to a struct which contains the
|
||||||
|
five values. The new version expects the five arguments be given in the
|
||||||
|
registers. First try the new version, if it's not available fall back
|
||||||
|
to the old version. */
|
||||||
|
|
||||||
|
.text
|
||||||
|
SYSCALL_ERROR_HANDLER
|
||||||
|
ENTRY (__select)
|
||||||
|
|
||||||
|
#if 0 /* For now only use the old version. */
|
||||||
|
DO_CALL (#SYS_ify (_newselect), 5)
|
||||||
|
tst.l %d0
|
||||||
|
jmi 1f
|
||||||
|
rts
|
||||||
|
|
||||||
|
1: move.l #-ENOSYS, %d1
|
||||||
|
cmp.l %d1, %d0
|
||||||
|
jne syscall_error /* Real error */
|
||||||
|
|
||||||
|
/* Try again using the old syscall interface. */
|
||||||
|
#endif
|
||||||
|
lea 4(%sp), %a0
|
||||||
|
move.l %a0, %d1
|
||||||
|
move.l #SYS_ify (select), %d0
|
||||||
|
trap #0
|
||||||
|
tst.l %d0
|
||||||
|
jmi syscall_error
|
||||||
|
ret
|
||||||
|
|
||||||
|
weak_alias (__select, select)
|
||||||
31
sysdeps/unix/sysv/linux/m68k/sigcontext.h
Normal file
31
sysdeps/unix/sysv/linux/m68k/sigcontext.h
Normal file
@ -0,0 +1,31 @@
|
|||||||
|
/* Structure describing state saved while handling a signal. Linux/m68k version.
|
||||||
|
Copyright (C) 1996 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. */
|
||||||
|
|
||||||
|
/* State of this thread when the signal was taken. */
|
||||||
|
struct sigcontext
|
||||||
|
{
|
||||||
|
__sigset_t sc_mask;
|
||||||
|
unsigned long sc_usp;
|
||||||
|
unsigned long sc_d0;
|
||||||
|
unsigned long sc_d1;
|
||||||
|
unsigned long sc_a0;
|
||||||
|
unsigned long sc_a1;
|
||||||
|
unsigned short sc_sr;
|
||||||
|
unsigned long sc_pc;
|
||||||
|
};
|
||||||
28
sysdeps/unix/sysv/linux/m68k/sigreturn.S
Normal file
28
sysdeps/unix/sysv/linux/m68k/sigreturn.S
Normal file
@ -0,0 +1,28 @@
|
|||||||
|
/* Copyright (C) 1996 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 <sysdep.h>
|
||||||
|
|
||||||
|
.text
|
||||||
|
ENTRY (__sigreturn)
|
||||||
|
addq.l #4, %sp /* Pop the return PC. */
|
||||||
|
DO_CALL (#SYS_ify (sigreturn), 0)
|
||||||
|
/* Do the system call; it never returns. */
|
||||||
|
/* NOTREACHED */
|
||||||
|
|
||||||
|
weak_alias (__sigreturn, sigreturn)
|
||||||
62
sysdeps/unix/sysv/linux/m68k/socket.S
Normal file
62
sysdeps/unix/sysv/linux/m68k/socket.S
Normal file
@ -0,0 +1,62 @@
|
|||||||
|
/* Copyright (C) 1996 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 <sysdep.h>
|
||||||
|
#include <sys/socketcall.h>
|
||||||
|
|
||||||
|
#define P(a, b) P2(a, b)
|
||||||
|
#define P2(a, b) a##b
|
||||||
|
|
||||||
|
.text
|
||||||
|
SYSCALL_ERROR_HANDLER
|
||||||
|
|
||||||
|
/* The socket-oriented system calls are handled unusally in Linux.
|
||||||
|
They are all gated through the single `socketcall' system call number.
|
||||||
|
`socketcall' takes two arguments: the first is the subcode, specifying
|
||||||
|
which socket function is being called; and the second is a pointer to
|
||||||
|
the arguments to the specific function.
|
||||||
|
|
||||||
|
The .S files for the other calls just #define socket and #include this. */
|
||||||
|
|
||||||
|
.globl P(__,socket)
|
||||||
|
ENTRY (P(__,socket))
|
||||||
|
|
||||||
|
/* Save registers. */
|
||||||
|
move.l %d2, %a0
|
||||||
|
|
||||||
|
move.l #SYS_ify (socketcall), %d0 /* System call number in %d0. */
|
||||||
|
|
||||||
|
/* Use ## so `socket' is a separate token that might be #define'd. */
|
||||||
|
move.l #P (SOCKOP_,socket), %d1 /* Subcode is first arg to syscall. */
|
||||||
|
lea 4(%sp), %a1 /* Address of args is 2nd arg. */
|
||||||
|
move.l %a1, %d2
|
||||||
|
|
||||||
|
/* Do the system call trap. */
|
||||||
|
trap #0
|
||||||
|
|
||||||
|
/* Restore registers. */
|
||||||
|
move.l %a0, %d2
|
||||||
|
|
||||||
|
/* %d0 is < 0 if there was an error. */
|
||||||
|
tst.l %d0
|
||||||
|
jmi syscall_error
|
||||||
|
|
||||||
|
/* Successful; return the syscall's value. */
|
||||||
|
rts
|
||||||
|
|
||||||
|
weak_alias (P(__,socket), socket)
|
||||||
31
sysdeps/unix/sysv/linux/m68k/syscall.S
Normal file
31
sysdeps/unix/sysv/linux/m68k/syscall.S
Normal file
@ -0,0 +1,31 @@
|
|||||||
|
/* Copyright (C) 1996 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 <sysdep.h>
|
||||||
|
|
||||||
|
.text
|
||||||
|
SYSCALL_ERROR_HANDLER
|
||||||
|
ENTRY (syscall)
|
||||||
|
move.l (%sp)+, %a0 /* Pop return address. */
|
||||||
|
DO_CALL ((%sp), 5) /* Frob the args and do the system call. */
|
||||||
|
tst.l %d0 /* Check %d0 for error. */
|
||||||
|
jmi error /* Jump to error handler if negative. */
|
||||||
|
jmp (%a0) /* Return to caller. */
|
||||||
|
|
||||||
|
error: pea (%a0)
|
||||||
|
jra syscall_error
|
||||||
71
sysdeps/unix/sysv/linux/m68k/sysdep.S
Normal file
71
sysdeps/unix/sysv/linux/m68k/sysdep.S
Normal file
@ -0,0 +1,71 @@
|
|||||||
|
/* Copyright (C) 1996 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. */
|
||||||
|
|
||||||
|
/* Because the Linux version is in fact m68k/ELF and the start.? file
|
||||||
|
for this system (sysdeps/m68k/elf/start.S) is also used by The Hurd
|
||||||
|
and therefore this files must not contain the definition of the
|
||||||
|
`errno' variable (I don't know why, ask Roland), we have to define
|
||||||
|
it somewhere else.
|
||||||
|
|
||||||
|
...and this place is here. */
|
||||||
|
.bss
|
||||||
|
.globl errno
|
||||||
|
.type errno,@object
|
||||||
|
errno: .space 4
|
||||||
|
.size errno,4
|
||||||
|
.globl _errno
|
||||||
|
.type _errno,@object
|
||||||
|
_errno = errno /* This name is expected by hj libc.so.5 startup code. */
|
||||||
|
.text
|
||||||
|
|
||||||
|
/* The following code is not used at all in the shared library.
|
||||||
|
The PIC system call stubs set errno themselves. */
|
||||||
|
|
||||||
|
#ifndef PIC
|
||||||
|
|
||||||
|
#include <sysdep.h>
|
||||||
|
#define _ERRNO_H
|
||||||
|
#include <errnos.h>
|
||||||
|
|
||||||
|
.globl errno
|
||||||
|
.globl __syscall_error
|
||||||
|
|
||||||
|
/* The syscall stubs jump here when they detect an error. */
|
||||||
|
|
||||||
|
.globl __syscall_error
|
||||||
|
__syscall_error:
|
||||||
|
neg.l %d0
|
||||||
|
|
||||||
|
#if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
|
||||||
|
/* We translate the system's EWOULDBLOCK error into EAGAIN.
|
||||||
|
The GNU C library always defines EWOULDBLOCK==EAGAIN.
|
||||||
|
EWOULDBLOCK_sys is the original number. */
|
||||||
|
move.l #EWOULDBLOCK_sys, %d1
|
||||||
|
cmp.l %d0, %d1
|
||||||
|
jne 1f
|
||||||
|
move.l #EAGAIN, %d0
|
||||||
|
1:
|
||||||
|
#endif
|
||||||
|
|
||||||
|
move.l %d0, errno
|
||||||
|
move.l #-1, %d0
|
||||||
|
/* Copy return value to %a0 for syscalls that are declared to
|
||||||
|
return a pointer. */
|
||||||
|
move.l %d0, %a0
|
||||||
|
rts
|
||||||
|
#endif /* PIC */
|
||||||
131
sysdeps/unix/sysv/linux/m68k/sysdep.h
Normal file
131
sysdeps/unix/sysv/linux/m68k/sysdep.h
Normal file
@ -0,0 +1,131 @@
|
|||||||
|
/* Copyright (C) 1996 Free Software Foundation, Inc.
|
||||||
|
This file is part of the GNU C Library.
|
||||||
|
Written by Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>,
|
||||||
|
December 1995.
|
||||||
|
|
||||||
|
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. */
|
||||||
|
|
||||||
|
/* In the Linux/ELF world, C symbols are asm symbols. */
|
||||||
|
#define NO_UNDERSCORES
|
||||||
|
|
||||||
|
#include <sysdeps/unix/sysdep.h>
|
||||||
|
|
||||||
|
#ifdef ASSEMBLER
|
||||||
|
|
||||||
|
#define POUND #
|
||||||
|
|
||||||
|
/* Define an entry point visible from C. */
|
||||||
|
#define ENTRY(name) \
|
||||||
|
.globl name; \
|
||||||
|
.type name, @function; \
|
||||||
|
.align 4; \
|
||||||
|
name##:
|
||||||
|
|
||||||
|
/* 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
|
||||||
|
|
||||||
|
/* Linux uses a negative return value to indicate syscall errors, unlike
|
||||||
|
most Unices, which use the condition codes' carry flag. */
|
||||||
|
#define PSEUDO(name, syscall_name, args) \
|
||||||
|
.text; \
|
||||||
|
SYSCALL_ERROR_HANDLER \
|
||||||
|
ENTRY (name) \
|
||||||
|
DO_CALL (POUND SYS_ify (syscall_name), args); \
|
||||||
|
tst.l %d0; \
|
||||||
|
jmi syscall_error;
|
||||||
|
|
||||||
|
#ifdef PIC
|
||||||
|
/* Store (- %d0) into errno through the GOT. */
|
||||||
|
#define SYSCALL_ERROR_HANDLER \
|
||||||
|
syscall_error: \
|
||||||
|
move.l (errno@GOTPC.l, %pc), %a0; \
|
||||||
|
neg.l %d0; \
|
||||||
|
move.l %d0, (%a0); \
|
||||||
|
move.l POUND -1, %d0; \
|
||||||
|
/* Copy return value to %a0 for syscalls that are declared to return \
|
||||||
|
a pointer (e.g., mmap). */ \
|
||||||
|
move.l %d0, %a0; \
|
||||||
|
rts;
|
||||||
|
#else
|
||||||
|
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Linux takes system call arguments in registers:
|
||||||
|
|
||||||
|
syscall number %d0 call-clobbered
|
||||||
|
arg 1 %d1 call-clobbered
|
||||||
|
arg 2 %d2 call-saved
|
||||||
|
arg 3 %d3 call-saved
|
||||||
|
arg 4 %d4 call-saved
|
||||||
|
arg 5 %d5 call-saved
|
||||||
|
|
||||||
|
The stack layout upon entering the function is:
|
||||||
|
|
||||||
|
20(%sp) Arg# 5
|
||||||
|
16(%sp) Arg# 4
|
||||||
|
12(%sp) Arg# 3
|
||||||
|
8(%sp) Arg# 2
|
||||||
|
4(%sp) Arg# 1
|
||||||
|
(%sp) Return address
|
||||||
|
|
||||||
|
(Of course a function with say 3 arguments does not have entries for
|
||||||
|
arguments 4 and 5.)
|
||||||
|
|
||||||
|
Separate move's are faster than movem, but need more space. Since
|
||||||
|
speed is more important, we don't use movem. Since %a0 and %a1 are
|
||||||
|
scratch registers, we can use them for saving as well. */
|
||||||
|
|
||||||
|
#define DO_CALL(syscall, args) \
|
||||||
|
move.l syscall, %d0; \
|
||||||
|
DOARGS_##args \
|
||||||
|
trap POUND 0; \
|
||||||
|
UNDOARGS_##args
|
||||||
|
|
||||||
|
#define DOARGS_0 /* No arguments to frob. */
|
||||||
|
#define UNDOARGS_0 /* No arguments to unfrob. */
|
||||||
|
#define _DOARGS_0(n) /* No arguments to frob. */
|
||||||
|
|
||||||
|
#define DOARGS_1 _DOARGS_1 (4)
|
||||||
|
#define _DOARGS_1(n) move.l n(%sp), %d1; _DOARGS_0 (n)
|
||||||
|
#define UNDOARGS_1 UNDOARGS_0
|
||||||
|
|
||||||
|
#define DOARGS_2 _DOARGS_2 (8)
|
||||||
|
#define _DOARGS_2(n) move.l %d2, %a0; move.l n(%sp), %d2; _DOARGS_1 (n-4)
|
||||||
|
#define UNDOARGS_2 UNDOARGS_1; move.l %a0, %d2
|
||||||
|
|
||||||
|
#define DOARGS_3 _DOARGS_3 (12)
|
||||||
|
#define _DOARGS_3(n) move.l %d3, %a1; move.l n(%sp), %d3; _DOARGS_2 (n-4)
|
||||||
|
#define UNDOARGS_3 UNDOARGS_2; move.l %a1, %d3
|
||||||
|
|
||||||
|
#define DOARGS_4 _DOARGS_4 (16)
|
||||||
|
#define _DOARGS_4(n) move.l %d4, -(%sp); move.l n+4(%sp), %d4; _DOARGS_3 (n)
|
||||||
|
#define UNDOARGS_4 UNDOARGS_3; move.l (%sp)+, %d4
|
||||||
|
|
||||||
|
#define DOARGS_5 _DOARGS_5 (20)
|
||||||
|
#define _DOARGS_5(n) move.l %d5, -(%sp); move.l n+4(%sp), %d5; _DOARGS_4 (n)
|
||||||
|
#define UNDOARGS_5 UNDOARGS_4; move.l (%sp)+, %d5
|
||||||
|
|
||||||
|
|
||||||
|
#define ret rts
|
||||||
|
#if 0 /* Not used by Linux */
|
||||||
|
#define r0 %d0
|
||||||
|
#define r1 %d1
|
||||||
|
#define MOVE(x,y) movel x , y
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif /* ASSEMBLER */
|
||||||
Loading…
Reference in New Issue
Block a user