101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
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Derived from @(#)_setjmp.s 5.7 (Berkeley) 6/27/88,
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Copyright (c) 1980 Regents of the University of California.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <setjmp.h>
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#ifndef __GNUC__
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#error This file uses GNU C extensions; you must compile with GCC.
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#endif
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#define REI 02 /* Vax `rei' opcode. */
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/* Jump to the position specified by ENV, causing the
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setjmp call there to return VAL, or 1 if VAL is 0. */
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__NORETURN
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void
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DEFUN(__longjmp, (env, val), CONST __jmp_buf env AND int val)
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{
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register long int *fp asm("fp");
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long int *regsave;
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unsigned long int flags;
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if (env.__fp == NULL)
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__libc_fatal("longjmp: Invalid ENV argument.\n");
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if (val == 0)
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val = 1;
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asm volatile("loop:");
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flags = *(long int *) (6 + (char *) fp);
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regsave = (long int *) (20 + (char *) fp);
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if (flags & 1)
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/* R0 was saved by the caller.
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Store VAL where it will be restored from. */
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*regsave++ = val;
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if (flags & 2)
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/* R1 was saved by the caller.
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Store ENV where it will be restored from. */
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*regsave = env;
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/* Was the FP saved in the last call the same one in ENV? */
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asm volatile("cmpl %0, 12(fp);"
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/* Yes, return to it. */
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"beql done;"
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/* The FP in ENV is less than the one saved in the last call.
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This means we have already returned from the function that
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called `setjmp' with ENV! */
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"blssu latejump;" : /* No outputs. */ : "g" (env.__fp));
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/* We are more than one level below the state in ENV.
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Return to where we will pop another stack frame. */
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asm volatile("movl $loop, 16(fp);"
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"ret");
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asm volatile("done:");
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{
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char return_insn asm("*16(fp)");
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if (return_insn == REI)
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/* We're returning with an `rei' instruction.
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Do a return with PSL-PC pop. */
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asm volatile("movab 0f, 16(fp)");
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else
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/* Do a standard return. */
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asm volatile("movab 1f, 16(fp)");
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/* Return. */
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asm volatile("ret");
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}
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asm volatile("0:" /* `rei' return. */
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/* Compensate for PSL-PC push. */
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"addl2 %0, sp;"
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"1:" /* Standard return. */
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/* Return to saved PC. */
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"jmp %1" : /* No outputs. */ :
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"g" (8), "g" (env.__pc));
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/* Jump here when the FP saved in ENV points
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to a function that has already returned. */
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asm volatile("latejump:");
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__libc_fatal("longjmp: Attempt to jump to a function that has returned.\n");
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}
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