diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/clone.S | 33 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/socket.S | 49 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/syscall.S | 47 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/sysdep.h | 73 |
4 files changed, 202 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/clone.S b/sysdeps/unix/sysv/linux/arm/clone.S new file mode 100644 index 0000000000..c7e7aed9c8 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/clone.S @@ -0,0 +1,33 @@ +/* Copyright (C) 1996, 1997 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. */ + +/* clone() is even more special than fork() as it mucks with stacks + and invokes a function in the right context after its all over. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <errnos.h> + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ + + .text +ENTRY(__clone) + /* Somebody needs to write this. */ +PSEUDO_END (__clone) + +weak_alias (__clone, clone) diff --git a/sysdeps/unix/sysv/linux/arm/socket.S b/sysdeps/unix/sysv/linux/arm/socket.S new file mode 100644 index 0000000000..e8db072971 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/socket.S @@ -0,0 +1,49 @@ +/* Copyright (C) 1995, 1996, 1997 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> +#include <sys/socketcall.h> + +#define P(a, b) P2(a, b) +#define P2(a, b) a##b + + .text +/* 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)) + + /* Do the system call trap. */ + swi SYS_ify(socketcall) + + /* %eax is < 0 if there was an error. */ + cmn r0, $124 + bge syscall_error + + /* Successful; return the syscall's value. */ + RETINSTR(mov,pc,r14) + +PSEUDO_END (P(__,socket)) + +weak_alias (P(__,socket), socket) diff --git a/sysdeps/unix/sysv/linux/arm/syscall.S b/sysdeps/unix/sysv/linux/arm/syscall.S new file mode 100644 index 0000000000..7a87278303 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/syscall.S @@ -0,0 +1,47 @@ +/* Copyright (C) 1995, 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> + +/* Please consult the file sysdeps/unix/sysv/linux/arm/sysdep.h for + more information about the value -4095 used below.*/ + + .text +ENTRY (syscall) + + /* Normally encoding the system call number in the instruction is + good. But we pay the price here. */ + + sub sp, sp, $0xc @ get 3 words on the stack + orr r0, r0, $0xef000000 @ make up a SWI instruction + orr r0, r0, $SWI_BASE + str r0, [sp] + ldr r0, _reti + str r0, [sp, $4] + adr r0, _ret + str r0, [sp, $8] + mov r0, r1 + mov r1, r2 + mov r2, r3 + mov pc, sp +_ret: add sp, sp, $0xc + RETINSTR(mov, pc, r14) + +_reti: .word 0xe51ff004 @ ldr pc, [pc, $4] + +PSEUDO_END (syscall) diff --git a/sysdeps/unix/sysv/linux/arm/sysdep.h b/sysdeps/unix/sysv/linux/arm/sysdep.h new file mode 100644 index 0000000000..6478a5d182 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/sysdep.h @@ -0,0 +1,73 @@ +/* Copyright (C) 1992, 93, 95, 96, 97 Free Software Foundation, Inc. +This file is part of the GNU C Library. +Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. +ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997. + +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. */ + +#ifndef _LINUX_ARM_SYSDEP_H +#define _LINUX_ARM_SYSDEP_H 1 + +/* There is some commonality. */ +#include <sysdeps/unix/arm/sysdep.h> + +/* 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 SWI_BASE (9 << 20) +#define SYS_ify(syscall_name) (SWI_BASE + __NR_##syscall_name) + + +#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. */ +#undef PSEUDO +#define PSEUDO(name, syscall_name, args) \ + .text; \ + ENTRY (name) \ + DO_CALL (args, syscall_name); \ + cmn r0, $4096; \ + bge syscall_error; + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER \ + END (name) + +#ifndef PIC +#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ +#else +#error Aiee +#endif /* PIC */ + +#undef DO_CALL +#define DO_CALL(args, syscall_name) \ + swi SYS_ify (syscall_name); + +#endif /* ASSEMBLER */ + +#endif /* linux/arm/sysdep.h */ |