/* Copyright (C) 1997, 1998 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, see <http://www.gnu.org/licenses/>. */ #include <jmpbuf-offsets.h> ;---------------------------------------- ; Name: __longjmp ; Description: Restore the current context ; as saved by a previous nr_setjmp ; Input: %o0: jmp_buf (ptr to) array to restore context from ; %o1: integer to return ; Output: %o0 = 0 the first time we're called, or ; whatever longjmp returns later ; Side Effects: uses %g0, %g1 & %g2 ; CWP Depth: 0 ; .align 2 .global __longjmp __longjmp: ; ; The way we'll do this is by executing ; RESTORE instructions until the old ; return address matches. Then we'll ; jump to where setjmp was called from. ; ; Since we're moving the window pointer ; all over the place, we'll naturally ; only use the %g registers. ; mov %g0,%o0 ; %g0 -> jmp_buf mov %g1,%o1 ; %g1 = return value pfx jmpbuf_callersret ld %g2,[%g0] ; %g2 = old return address __longjmp_loop: cmp %g2,%i7 ; Are we there yet? skps cc_ne br __longjmp_done nop ; (delay slot) br __longjmp_loop restore ; (delay slot) ; ; One might put in a watchdog counter here, to ; prevent a runaway stack crawl... but what would that ; accomplish? What error can we throw? To whom? ; __longjmp_done: pfx jmpbuf_l0 ; Restore local register l0 ld %l0,[%g0] pfx jmpbuf_l1 ; Restore local register l1 ld %l1,[%g0] pfx jmpbuf_l2 ; Restore local register l2 ld %l2,[%g0] pfx jmpbuf_l3 ; Restore local register l3 ld %l3,[%g0] pfx jmpbuf_l4 ; Restore local register l4 ld %l4,[%g0] pfx jmpbuf_l5 ; Restore local register l5 ld %l5,[%g0] pfx jmpbuf_l6 ; Restore local register l6 ld %l6,[%g0] pfx jmpbuf_l7 ; Restore local register l7 ld %l7,[%g0] pfx jmpbuf_i0 ; Restore input register i0 ld %i0,[%g0] pfx jmpbuf_i1 ; Restore input register i1 ld %i1,[%g0] pfx jmpbuf_i2 ; Restore input register i2 ld %i2,[%g0] pfx jmpbuf_i3 ; Restore input register i3 ld %i3,[%g0] pfx jmpbuf_i4 ; Restore input register i4 ld %i4,[%g0] pfx jmpbuf_i5 ; Restore input register i5 ld %i5,[%g0] pfx jmpbuf_jmpret ld %o7,[%g0] ; set fake return address jmp %o7 ; and kinda return there. mov %o0,%g1 ; (delay slot) return value libc_hidden_def(__longjmp)