diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S new file mode 100644 index 0000000000..a07b7d3238 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S @@ -0,0 +1,101 @@ +/* Wrapper around clone system call. + Copyright (C) 1997-2017 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 + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +#define CLONE_VM 0x00000100 +#define CLONE_THREAD 0x00010000 + + +/* This is the only really unusual system call in PPC linux, but not + because of any weirdness in the system call itself; because of + all the freaky stuff we have to do to make the call useful. */ + +/* int [r3] clone(int (*fn)(void *arg) [r3], void *child_stack [r4], + int flags [r5], void *arg [r6], void *parent_tid [r7], + void *tls [r8], void *child_tid [r9]); */ + +ENTRY (__clone) + + /* Check for child_stack == NULL || fn == NULL. */ + cmpwi cr0,r4,0 + cmpwi cr1,r3,0 + cror cr0*4+eq,cr1*4+eq,cr0*4+eq + beq- cr0,L(badargs) + + /* Set up stack frame for parent. */ + stwu r1,-32(r1) + cfi_adjust_cfa_offset (32) + stmw r28,16(r1) + + /* Set up stack frame for child. */ + clrrwi r4,r4,4 + li r0,0 + stwu r0,-16(r4) + + /* Save fn, args, stack across syscall. */ + mr r30,r3 /* Function in r30. */ + mr r28,r5 + mr r31,r6 /* Argument in r31. */ + + /* 'flags' argument is first parameter to clone syscall. (The other + argument is the stack pointer, already in r4.) */ + mr r3,r5 + + /* Move the parent_tid, child_tid and tls arguments. */ + mr r5,r7 + mr r6,r8 + mr r7,r9 + + /* End FDE now, because in the child the unwind info will be + wrong. */ + cfi_endproc + + /* Do the call. */ + DO_CALL(SYS_ify(clone)) + + /* Check for child process. */ + cmpwi cr1,r3,0 + crandc cr1*4+eq,cr1*4+eq,cr0*4+so + bne- cr1,L(parent) /* The '-' is to minimise the race. */ + + /* Call procedure. */ + mtctr r30 + mr r3,r31 + bctrl + /* Call _exit with result from procedure. */ + b HIDDEN_JUMPTARGET(_exit) + +L(parent): + /* Parent. Restore registers & return. */ + lmw r28,16(r1) + addi r1,r1,32 + bnslr+ + b __syscall_error@local + +L(badargs): + li r3,EINVAL + b __syscall_error@local + + cfi_startproc +END (__clone) + +libc_hidden_def (__clone) +weak_alias (__clone, clone) |