2 Copyright © 1995-2001, The AROS Development Team. All rights reserved.
9 /******************************************************************************
14 void longjmp (jmp_buf env, int val);
17 Save the current context so that you can return to it later.
20 env - The context/environment to restore
21 val - This value is returned by setjmp() when you return to the
22 saved context. You cannot return 0. If val is 0, then
23 setjmp() returns with 1.
26 This function doesn't return.
37 ... this code is executed after setjmp() returns ...
39 // This is no good example on how to use this function
40 // You should not do that
48 ... this code is executed if you call longjmp(env) ...
60 ******************************************************************************/
62 #include "../include/aros/machine.i"
68 .set FirstArg, 4 /* Skip Return-Adress */
74 move.
l env
(%sp
),%a0
/* save area pointer */
77 moveq.
l #1,%d0 /* make sure it isn't 0 */
79 move.
l 4(%a0
),%sp
/* restore SP */
80 move.
l 0(%a0
),(%sp
) /* restore PC */
81 movem.
l 8(%a0
),%d2-
%d7
/%a2-
%a6
/* restore remaining non-scratch regs */
84 /* New version adapted from libnix instead of ixemul.
85 * Note the slightly different register save order.
87 addq.w
#4,%sp /* returns to other address */
88 move.
l (%sp
)+,%a0
/* get address of jmp_buf */
89 move.
l (%sp
)+,%d0
/* get return code */
91 moveq.
l #1,%d0 /* make sure it isn't 0 */
93 move.
l 48(%a0
),%sp
/* restore sp */
94 move.
l (%a0
)+,(%sp
) /* set return address */
95 movem.
l (%a0
),%d2-
%d7
/%a2-
%a6
/* restore all registers except scratch and sp */
100 The jmp_buf is filled as follows (d0/d1/a0/a1 are not saved):
102 _jmp_buf offset contents