diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/arm/nptl/vfork.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/arm/nptl/vfork.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/arm/nptl/vfork.S b/ports/sysdeps/unix/sysv/linux/arm/nptl/vfork.S new file mode 100644 index 0000000000..235380198b --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/arm/nptl/vfork.S @@ -0,0 +1,42 @@ +/* Copyright (C) 2005, 2010 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 <tcb-offsets.h> + +/* Save the PID value. */ +#define SAVE_PID \ + str lr, [sp, #-4]!; /* Save LR. */ \ + cfi_adjust_cfa_offset (4); \ + cfi_rel_offset (lr, 0); \ + mov r0, #0xffff0fff; /* Point to the high page. */ \ + mov lr, pc; /* Save our return address. */ \ + sub pc, r0, #31; /* Jump to the TLS entry. */ \ + ldr lr, [sp], #4; /* Restore LR. */ \ + cfi_adjust_cfa_offset (-4); \ + cfi_restore (lr); \ + mov r2, r0; /* Save the TLS addr in r2. */ \ + ldr r3, [r2, #PID_OFFSET]; /* Load the saved PID. */ \ + rsbs r0, r3, #0; /* Negate it. */ \ + moveq r0, #0x80000000; /* Use 0x80000000 if it was 0. */ \ + str r0, [r2, #PID_OFFSET] /* Store the temporary PID. */ + +/* Restore the old PID value in the parent. */ +#define RESTORE_PID \ + cmp r0, #0; /* If we are the parent... */ \ + strne r3, [r2, #PID_OFFSET] /* ... restore the saved PID. */ + +#include "../vfork.S" |