diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/mips/nptl/vfork.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/mips/nptl/vfork.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/mips/nptl/vfork.S b/ports/sysdeps/unix/sysv/linux/mips/nptl/vfork.S new file mode 100644 index 0000000000..cafe316f1a --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/mips/nptl/vfork.S @@ -0,0 +1,41 @@ +/* Copyright (C) 2005, 2006 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 <tls.h> + +/* Save the PID value. */ +#define SAVE_PID \ + READ_THREAD_POINTER(v1); /* Get the thread pointer. */ \ + lw a2, PID_OFFSET(v1); /* Load the saved PID. */ \ + subu a2, $0, a2; /* Negate it. */ \ + bnez a2, 1f; /* If it was zero... */ \ + lui a2, 0x8000; /* use 0x80000000 instead. */ \ +1: sw a2, PID_OFFSET(v1); /* Store the temporary PID. */ + +/* Restore the old PID value in the parent. */ +#define RESTORE_PID \ + beqz v0, 1f; /* If we are the parent... */ \ + READ_THREAD_POINTER(v1); /* Get the thread pointer. */ \ + lw a2, PID_OFFSET(v1); /* Load the saved PID. */ \ + subu a2, $0, a2; /* Re-negate it. */ \ + lui a0, 0x8000; /* Load 0x80000000... */ \ + bne a2, a0, 2f; /* ... compare against it... */ \ + li a2, 0; /* ... use 0 instead. */ \ +2: sw a2, PID_OFFSET(v1); /* Restore the PID. */ \ +1: + +#include <sysdeps/unix/sysv/linux/mips/vfork.S> |