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/* Copyright (c) 2013 Red Hat, Inc. All rights reserved.
This copyrighted material is made available to anyone wishing to use,
modify, copy, or redistribute it subject to the terms and conditions
of the BSD License. This program is distributed in the hope that
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
including the implied warranties of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. A copy of this license is available at
http://www.opensource.org/licenses. Any Red Hat trademarks that are
incorporated in the source code or documentation are not subject to
the BSD License and may only be used or replicated with the express
permission of Red Hat, Inc.
*/
# setjmp/longjmp for msp430. The jmpbuf looks like this:
#
# Register Jmpbuf offset
# small large
# r0 (pc) 0x00 0x00
# r1 (sp) 0x02 0x04
# r4 0x04 0x08
# r5 0x06 0x0c
# r6 0x08 0x10
# r7 0x0a 0x14
# r8 0x0c 0x18
# r9 0x0e 0x1c
# r10 0x10 0x20
.text
.global setjmp
setjmp:
; Upon entry r12 points to the jump buffer.
; Returns 0 to caller.
#if defined __MSP430X_LARGE__
mova @r1, r13
mova r13, 0(r12)
mova r1, 4(r12)
mova r4, 8(r12)
mova r5, 12(r12)
mova r6, 16(r12)
mova r7, 20(r12)
mova r8, 24(r12)
mova r9, 28(r12)
mova r10, 32(r12)
clr r12
reta
#else
;; Get the return address off the stack
mov.w @r1, r13
mov.w r13, 0(r12)
mov.w r1, 2(r12)
mov.w r4, 4(r12)
mov.w r5, 6(r12)
mov.w r6, 8(r12)
mov.w r7, 10(r12)
mov.w r8, 12(r12)
mov.w r9, 14(r12)
mov.w r10, 16(r12)
clr r12
ret
#endif
.global longjmp
longjmp:
; Upon entry r12 points to the jump buffer and
; r13 contains the value to be returned by setjmp.
#if defined __MSP430X_LARGE__
mova @r12+, r14
mova @r12+, r1
mova @r12+, r4
mova @r12+, r5
mova @r12+, r6
mova @r12+, r7
mova @r12+, r8
mova @r12+, r9
mova @r12+, r10
#else
mov.w @r12+, r14
mov.w @r12+, r1
mov.w @r12+, r4
mov.w @r12+, r5
mov.w @r12+, r6
mov.w @r12+, r7
mov.w @r12+, r8
mov.w @r12+, r9
mov.w @r12+, r10
#endif
; If caller attempts to return 0, return 1 instead.
cmp.w #0, r13
jne .Lnot_zero
mov.w #1, r13
.Lnot_zero:
mov.w r13, r12
#if defined __MSP430X_LARGE__
adda #4, r1
mova r14, r0
#else
add.w #2, r1
mov.w r14, r0
#endif
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