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authorAustin Foxley <austinf@cetoncorp.com>2009-10-17 13:05:04 -0700
committerAustin Foxley <austinf@cetoncorp.com>2009-10-17 13:05:04 -0700
commit843d561eba0c4856fc4465215d56c81b868dec14 (patch)
tree87fad6df4f60f2ea710ccaacb5cf645731172331 /libc/sysdeps/linux/sparc/sparcv9
parent4a689f0b907d4a98582a9c4b7f6be811924db8ee (diff)
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 <austinf@cetoncorp.com>
Diffstat (limited to 'libc/sysdeps/linux/sparc/sparcv9')
-rw-r--r--libc/sysdeps/linux/sparc/sparcv9/clone.S102
1 files changed, 102 insertions, 0 deletions
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 <asm/errno.h>
+#include <asm/unistd.h>
+#include <tcb-offsets.h>
+#include <sysdep.h>
+
+#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)