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- /* 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)
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