mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 03:20:05 +00:00
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
|
|
Derived from @(#)_setjmp.s 5.7 (Berkeley) 6/27/88,
|
|
Copyright (c) 1980 Regents of the University of California.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <setjmp.h>
|
|
|
|
#ifndef __GNUC__
|
|
#error This file uses GNU C extensions; you must compile with GCC.
|
|
#endif
|
|
|
|
|
|
#define REI 02 /* Vax `rei' opcode. */
|
|
|
|
/* Jump to the position specified by ENV, causing the
|
|
setjmp call there to return VAL, or 1 if VAL is 0. */
|
|
__NORETURN
|
|
void
|
|
DEFUN(__longjmp, (env, val), CONST __jmp_buf env AND int val)
|
|
{
|
|
register long int *fp asm("fp");
|
|
long int *regsave;
|
|
unsigned long int flags;
|
|
|
|
if (env.__fp == NULL)
|
|
__libc_fatal("longjmp: Invalid ENV argument.\n");
|
|
|
|
if (val == 0)
|
|
val = 1;
|
|
|
|
asm volatile("loop:");
|
|
|
|
flags = *(long int *) (6 + (char *) fp);
|
|
regsave = (long int *) (20 + (char *) fp);
|
|
if (flags & 1)
|
|
/* R0 was saved by the caller.
|
|
Store VAL where it will be restored from. */
|
|
*regsave++ = val;
|
|
if (flags & 2)
|
|
/* R1 was saved by the caller.
|
|
Store ENV where it will be restored from. */
|
|
*regsave = env;
|
|
|
|
/* Was the FP saved in the last call the same one in ENV? */
|
|
asm volatile("cmpl %0, 12(fp);"
|
|
/* Yes, return to it. */
|
|
"beql done;"
|
|
/* The FP in ENV is less than the one saved in the last call.
|
|
This means we have already returned from the function that
|
|
called `setjmp' with ENV! */
|
|
"blssu latejump;" : /* No outputs. */ : "g" (env.__fp));
|
|
|
|
/* We are more than one level below the state in ENV.
|
|
Return to where we will pop another stack frame. */
|
|
asm volatile("movl $loop, 16(fp);"
|
|
"ret");
|
|
|
|
asm volatile("done:");
|
|
{
|
|
char return_insn asm("*16(fp)");
|
|
if (return_insn == REI)
|
|
/* We're returning with an `rei' instruction.
|
|
Do a return with PSL-PC pop. */
|
|
asm volatile("movab 0f, 16(fp)");
|
|
else
|
|
/* Do a standard return. */
|
|
asm volatile("movab 1f, 16(fp)");
|
|
|
|
/* Return. */
|
|
asm volatile("ret");
|
|
}
|
|
|
|
asm volatile("0:" /* `rei' return. */
|
|
/* Compensate for PSL-PC push. */
|
|
"addl2 %0, sp;"
|
|
"1:" /* Standard return. */
|
|
/* Return to saved PC. */
|
|
"jmp %1" : /* No outputs. */ :
|
|
"g" (8), "g" (env.__pc));
|
|
|
|
/* Jump here when the FP saved in ENV points
|
|
to a function that has already returned. */
|
|
asm volatile("latejump:");
|
|
__libc_fatal("longjmp: Attempt to jump to a function that has returned.\n");
|
|
}
|