From 7825930078208462655e107677656c45014e91b4 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Wed, 20 Jul 2016 23:41:10 +0200 Subject: microblaze: use assembly version of clone, fix vfork Signed-off-by: Waldemar Brodkorb --- libc/sysdeps/linux/microblaze/clone.S | 78 +++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 libc/sysdeps/linux/microblaze/clone.S (limited to 'libc/sysdeps/linux/microblaze/clone.S') diff --git a/libc/sysdeps/linux/microblaze/clone.S b/libc/sysdeps/linux/microblaze/clone.S new file mode 100644 index 000000000..46d4fe6b4 --- /dev/null +++ b/libc/sysdeps/linux/microblaze/clone.S @@ -0,0 +1,78 @@ +/* Copyright (C) 1996-2016 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 r5,1f ; // Invalid func + beqi r6,1f ; // 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 r4,1f + 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 + +1: rsubk r3,r3,r0 + rtsd r15,8 + addik r3,r0,-1 /* delay slot. */ + +END(__clone) + +libc_hidden_def (__clone) +weak_alias (__clone,clone) -- cgit v1.2.3