From ef114eafbff80525d079d7d6fadd69a58eb8dcc3 Mon Sep 17 00:00:00 2001 From: David Holsgrove Date: Mon, 17 Feb 2014 11:08:21 +1000 Subject: [MicroBlaze]: Move MicroBlaze from ports to sysdeps. 2014-02-17 David Holsgrove * sysdeps/microblaze: Move directory from ports/sysdeps/microblaze. * sysdeps/unix/sysv/linux/microblaze: Move directory from ports/sysdeps/unix/sysv/linux/microblaze. * README: Add missing listing for microblaze*-*-linux-gnu. Signed-off-by: David Holsgrove --- sysdeps/unix/sysv/linux/microblaze/clone.S | 72 ++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/microblaze/clone.S (limited to 'sysdeps/unix/sysv/linux/microblaze/clone.S') diff --git a/sysdeps/unix/sysv/linux/microblaze/clone.S b/sysdeps/unix/sysv/linux/microblaze/clone.S new file mode 100644 index 0000000000..c11213c2bd --- /dev/null +++ b/sysdeps/unix/sysv/linux/microblaze/clone.S @@ -0,0 +1,72 @@ +/* Copyright (C) 1996-2014 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 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, see + . */ + +/* 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 +#define _ERRNO_H 1 +#include + +/* int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg, + pid_t *ptid, struct user_desc *tls, pid_t *ctid); + + INCOMING: r5 (fn), r6 (child_stack), r7 (flags), r8 (arg), r9 (ptid) + r10 (tls), 28 (r1) ctid + + OUTGOING: + + linux: arch/microblaze/entry.S: sys_clone expects + r5 (flags) r6 (child stack) r7 (stack_size) r8 (ptid)r9 (ctid) + r10 (tls) +*/ + + .text +ENTRY (__clone) + addik r3,r0,-EINVAL + beqi r5,SYSCALL_ERROR_LABEL ; // Invalid func + beqi r6,SYSCALL_ERROR_LABEL ; // Invalid stack + addik r6,r6,-8 + swi r5,r6,0 ; // Push fn onto child's stack + swi r8,r6,4 ; // Push arg for child + addk r5,r0,r7 ; // flags for clone() syscall + addk r7,r0,r0 + addk r8,r0,r9 ; // parent tid ptr + lwi r9,r1,28 ; // child tid ptr + addik r12,r0,SYS_ify(clone) + brki r14,8 + addk r0,r0,r0 + addik r4,r0,-4095 + cmpu r4,r4,r3 + bgei r4,SYSCALL_ERROR_LABEL + beqi r3,L(thread_start) + rtsd r15,8 + nop + +L(thread_start): + lwi r12,r1,0 ; // fn + lwi r5,r1,4 ; // arg + brald r15,r12 + nop + addk r5,r0,r3 + addik r12,r0,SYS_ify(exit) + brki r14,8 + nop +PSEUDO_END(__clone) + +weak_alias (__clone,clone) -- cgit 1.4.1