/* Copyright (C) 1991, 1993, 1996, 1997 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #define _ASM 1 #include #define ENV(reg) [%g1 + (reg * 4)] ENTRY(__longjmp) /* Store our arguments in global registers so we can still use them while unwinding frames and their register windows. */ mov %o0, %g1 /* ENV in %g1 */ orcc %o1, %g0, %g2 /* VAL in %g2 */ be,a 0f /* Branch if zero; else skip delay slot. */ mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ 0: /* Cache target FP in register %g3. */ ld ENV(JB_FP), %g3 /* Now we will loop, unwinding the register windows up the stack until the restored %fp value matches the target value in %g3. */ LOC(loop): cmp %fp, %g3 /* Have we reached the target frame? */ bl,a LOC(loop) /* Loop while current fp is below target. */ restore /* Unwind register window in delay slot. */ be,a LOC(found) /* Better have hit it exactly. */ ld ENV(JB_SP), %o0 /* Delay slot: extract target SP. */ LOC(bogus): /* Get here only if the jmp_buf or stack is clobbered. */ call C_SYMBOL_NAME(abort) nop unimp 0 LOC(found): /* We have unwound register windows so %fp matches the target. */ cmp %o0, %sp /* Check jmp_buf SP vs register window. */ bge,a LOC(sp_ok) /* Saved must not be deeper than register. */ mov %o0, %sp /* OK, install new SP. */ b,a LOC(bogus) /* Bogus, we lose. */ LOC(sp_ok): ld ENV(JB_PC), %o0 /* Extract target return PC. */ jmp %o0 + 8 /* Return there. */ mov %g2, %o0 /* Delay slot: set return value. */ END(__longjmp)