Subversion Repositories hf-risc

/* 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <tls.h>
#include "tcb-offsets.h"

/* Save the PID value.  */
#define SAVE_PID \
        lw      t0, PID_OFFSET(tp);             /* Load the saved PID.  */      \
        neg     t0, t0;                         /* Negate it.  */               \
        bnez    t0, 1f;                         /* If it was zero... */         \
        li      t0, 0x80000000;                 /* use 0x80000000 instead.  */  \
1:      sw      t0, PID_OFFSET(tp);             /* Store the temporary PID.  */

/* Restore the old PID value in the parent.  */
#define RESTORE_PID \
        beqz    a0, 1f;                         /* If we are the parent... */   \
        lw      t0, PID_OFFSET(tp);             /* Load the saved PID.  */      \
        neg     t0, t0;                         /* Re-negate it.  */            \
        li      t1, 0x80000000;                 /* Load 0x80000000... */        \
        bne     t0, t1, 2f;                     /* ... compare against it... */ \
        li      t0, 0;                          /* ... use 0 instead.  */       \
2:      sw      t0, PID_OFFSET(tp);             /* Restore the PID.  */         \
1:

#include <sysdeps/unix/sysv/linux/riscv/vfork.S>