1 files changed, 108 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nios/__longjmp.S b/libc/sysdeps/linux/nios/__longjmp.S
new file mode 100644
index 000000000..c2b1979cc
--- /dev/null
+++ b/libc/sysdeps/linux/nios/__longjmp.S
@@ -0,0 +1,108 @@
+/* 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,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.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
+
+
+
+
+
+
+
+