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230528c467
This patch fixes the clone CLONE_VM change from 0cb313f (BZ#19957)
where the commit changed the register that contains the save flags
argument to compare with (from r28 to r29). This patch changes
back to correct register.
Tested on powerpc32 (thanks to Tulio Magno Quites Machado Filho).
* sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S (__clone): Fix
flags CLONE_VM compare.
111 lines
2.8 KiB
ArmAsm
111 lines
2.8 KiB
ArmAsm
/* Wrapper around clone system call.
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Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#define CLONE_VM 0x00000100
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#define CLONE_THREAD 0x00010000
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/* This is the only really unusual system call in PPC linux, but not
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because of any weirdness in the system call itself; because of
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all the freaky stuff we have to do to make the call useful. */
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/* int [r3] clone(int (*fn)(void *arg) [r3], void *child_stack [r4],
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int flags [r5], void *arg [r6], void *parent_tid [r7],
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void *tls [r8], void *child_tid [r9]); */
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ENTRY (__clone)
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/* Check for child_stack == NULL || fn == NULL. */
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cmpwi cr0,r4,0
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cmpwi cr1,r3,0
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cror cr0*4+eq,cr1*4+eq,cr0*4+eq
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beq- cr0,L(badargs)
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/* Set up stack frame for parent. */
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stwu r1,-32(r1)
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cfi_adjust_cfa_offset (32)
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stmw r28,16(r1)
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/* Set up stack frame for child. */
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clrrwi r4,r4,4
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li r0,0
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stwu r0,-16(r4)
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/* Save fn, args, stack across syscall. */
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mr r30,r3 /* Function in r30. */
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mr r28,r5
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mr r31,r6 /* Argument in r31. */
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/* 'flags' argument is first parameter to clone syscall. (The other
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argument is the stack pointer, already in r4.) */
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mr r3,r5
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/* Move the parent_tid, child_tid and tls arguments. */
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mr r5,r7
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mr r6,r8
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mr r7,r9
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/* End FDE now, because in the child the unwind info will be
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wrong. */
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cfi_endproc
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/* Do the call. */
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DO_CALL(SYS_ify(clone))
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/* Check for child process. */
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cmpwi cr1,r3,0
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crandc cr1*4+eq,cr1*4+eq,cr0*4+so
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bne- cr1,L(parent) /* The '-' is to minimise the race. */
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/* If CLONE_VM is set do not update the pid/tid field. */
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andi. r0,r28,CLONE_VM
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bne+ cr0,L(oldpid)
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DO_CALL(SYS_ify(getpid))
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stw r3,TID(r2)
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stw r3,PID(r2)
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L(oldpid):
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/* Call procedure. */
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mtctr r30
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mr r3,r31
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bctrl
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/* Call _exit with result from procedure. */
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b HIDDEN_JUMPTARGET(_exit)
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L(parent):
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/* Parent. Restore registers & return. */
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lmw r28,16(r1)
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addi r1,r1,32
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bnslr+
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b __syscall_error@local
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L(badargs):
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li r3,EINVAL
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b __syscall_error@local
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cfi_startproc
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END (__clone)
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libc_hidden_def (__clone)
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weak_alias (__clone, clone)
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