mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-03 18:31:04 +00:00
d153ca687c
* sysdeps/alpha/__longjmp.c (__longjmp): moved dummy while loop to end of function to avoid a jump across NOPs.
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* Copyright (C) 1992, 1994 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 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. */
|
|
|
|
/* Global register vars must come before any function defn. */
|
|
|
|
register long int
|
|
r9 asm ("$9"), r10 asm ("$10"), r11 asm ("$11"), r12 asm ("$12"),
|
|
r13 asm ("$13"), r14 asm ("$14");
|
|
|
|
register long int *fp asm ("$15"), *sp asm ("$30"), *retpc asm ("$26");
|
|
|
|
#if 1 /* XXX */
|
|
register double
|
|
f2 asm ("$f2"), f3 asm ("$f3"), f4 asm ("$f4"), f5 asm ("$f5"),
|
|
f6 asm ("$f6"), f7 asm ("$f7"), f8 asm ("$f8"), f9 asm ("$f9");
|
|
#endif
|
|
|
|
#include <setjmp.h>
|
|
|
|
|
|
/* Jump to the position specified by ENV, causing the
|
|
setjmp call there to return VAL, or 1 if VAL is 0. */
|
|
void
|
|
__longjmp (__jmp_buf env, int val)
|
|
{
|
|
register long int retval asm ("$0");
|
|
|
|
/* Restore the integer registers. */
|
|
r9 = env[0].__9;
|
|
r10 = env[0].__10;
|
|
r11 = env[0].__11;
|
|
r12 = env[0].__12;
|
|
r13 = env[0].__13;
|
|
r14 = env[0].__14;
|
|
|
|
#if 1 /* XXX */
|
|
/* Restore the floating point registers. */
|
|
f2 = env[0].__f2;
|
|
f3 = env[0].__f3;
|
|
f4 = env[0].__f4;
|
|
f5 = env[0].__f5;
|
|
f6 = env[0].__f6;
|
|
f7 = env[0].__f7;
|
|
f8 = env[0].__f8;
|
|
f9 = env[0].__f9;
|
|
#endif
|
|
|
|
/* Set the return PC to that of setjmp's caller. */
|
|
retpc = env[0].__pc;
|
|
|
|
/* Restore the FP and SP of setjmp's caller. */
|
|
fp = env[0].__fp;
|
|
sp = env[0].__sp;
|
|
|
|
/* Return VAL (or 1 if VAL is zero) to setjmp's caller.
|
|
|
|
We use an asm here rather than a normal C return statement
|
|
just in case the compiler wanted to do some stack frobnication
|
|
in the function epilogue. Since we have already restored
|
|
precisely the FP and SP the desired environment needs,
|
|
we must avoid the compiler doing anything with the stack. */
|
|
|
|
|
|
asm volatile
|
|
("cmoveq %1, 1, %0\n\t" /* $0 = val ?: 1; */
|
|
"ret $31, (%2), 1" /* return $0 */
|
|
: "=r" (retval)
|
|
/* The "0" constraint should force VAL into $0. */
|
|
: "0" (val), "r" (retpc));
|
|
|
|
while (1)
|
|
{
|
|
/* The loop is just to avoid `volatile function does return' warnings.
|
|
The instruction will only be executed once. */
|
|
asm volatile ("");
|
|
}
|
|
}
|