From 843d561eba0c4856fc4465215d56c81b868dec14 Mon Sep 17 00:00:00 2001 From: Austin Foxley Date: Sat, 17 Oct 2009 13:05:04 -0700 Subject: sparc specific bits needed for nptl * a tweaked clone.S with RESET_PID support * atomic.h with cmpxchg that works for v8 and beyond Signed-off-by: Austin Foxley --- libc/sysdeps/linux/sparc/sparcv9/clone.S | 102 +++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 libc/sysdeps/linux/sparc/sparcv9/clone.S (limited to 'libc/sysdeps/linux/sparc/sparcv9') diff --git a/libc/sysdeps/linux/sparc/sparcv9/clone.S b/libc/sysdeps/linux/sparc/sparcv9/clone.S new file mode 100644 index 000000000..9d101e239 --- /dev/null +++ b/libc/sysdeps/linux/sparc/sparcv9/clone.S @@ -0,0 +1,102 @@ +/* Copyright (C) 1997, 2000, 2007 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson (rth@tamu.edu). + + 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, 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 +#include +#include +#include + +#define CLONE_VM 0x00000100 +#define CLONE_THREAD 0x00010000 + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, + pid_t *ptid, void *tls, pid_t *ctid); */ + + .register %g2,#scratch + .register %g3,#scratch + + .text + +ENTRY (__clone) + save %sp, -192, %sp + cfi_def_cfa_register(%fp) + cfi_window_save + cfi_register(%o7, %i7) + + /* sanity check arguments */ + brz,pn %i0, 99f /* fn non-NULL? */ + mov %i0, %g2 + brz,pn %i1, 99f /* child_stack non-NULL? */ + mov %i2, %o0 /* clone flags */ + + /* The child_stack is the top of the stack, allocate one + whole stack frame from that as this is what the kernel + expects. Also, subtract STACK_BIAS. */ + sub %i1, 192 + 0x7ff, %o1 + mov %i3, %g3 + mov %i2, %g4 + + mov %i4,%o2 /* PTID */ + mov %i5,%o3 /* TLS */ + ldx [%fp+0x7ff+176],%o4 /* CTID */ + + /* Do the system call */ + set __NR_clone, %g1 + ta 0x6d + bcs,pn %xcc, 98f + nop + brnz,pn %o1, __thread_start + nop + jmpl %i7 + 8, %g0 + restore %o0, %g0, %o0 +99: mov EINVAL, %o0 +98: call HIDDEN_JUMPTARGET(__errno_location) + mov %o0, %i0 + st %i0, [%o0] + jmpl %i7 + 8, %g0 + restore %g0,-1,%o0 +END(__clone) + + .type __thread_start,@function +__thread_start: +#ifdef RESET_PID + sethi %hi(CLONE_THREAD), %l0 + andcc %g4, %l0, %g0 + bne,pt %icc, 1f + andcc %g4, CLONE_VM, %g0 + bne,a,pn %icc, 2f + mov -1,%o0 + set __NR_getpid,%g1 + ta 0x6d +2: st %o0,[%g7 + PID] + st %o0,[%g7 + TID] +1: +#endif + mov %g0, %fp /* terminate backtrace */ + call %g2 + mov %g3,%o0 + call HIDDEN_JUMPTARGET(_exit),0 + nop + + .size __thread_start, .-__thread_start + +weak_alias (__clone, clone) -- cgit v1.2.3