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https://github.com/autc04/Retro68.git
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108 lines
2.3 KiB
ArmAsm
108 lines
2.3 KiB
ArmAsm
/* Copyright (c) 2013 Red Hat, Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use,
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modify, copy, or redistribute it subject to the terms and conditions
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of the BSD License. This program is distributed in the hope that
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it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
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including the implied warranties of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. A copy of this license is available at
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http://www.opensource.org/licenses. Any Red Hat trademarks that are
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incorporated in the source code or documentation are not subject to
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the BSD License and may only be used or replicated with the express
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permission of Red Hat, Inc.
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*/
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# setjmp/longjmp for msp430. The jmpbuf looks like this:
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#
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# Register Jmpbuf offset
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# small large
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# r0 (pc) 0x00 0x00
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# r1 (sp) 0x02 0x04
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# r4 0x04 0x08
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# r5 0x06 0x0c
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# r6 0x08 0x10
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# r7 0x0a 0x14
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# r8 0x0c 0x18
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# r9 0x0e 0x1c
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# r10 0x10 0x20
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.text
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.global setjmp
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setjmp:
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; Upon entry r12 points to the jump buffer.
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; Returns 0 to caller.
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#if defined __MSP430X_LARGE__
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mova @r1, r13
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mova r13, 0(r12)
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mova r1, 4(r12)
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mova r4, 8(r12)
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mova r5, 12(r12)
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mova r6, 16(r12)
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mova r7, 20(r12)
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mova r8, 24(r12)
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mova r9, 28(r12)
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mova r10, 32(r12)
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clr r12
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reta
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#else
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;; Get the return address off the stack
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mov.w @r1, r13
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mov.w r13, 0(r12)
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mov.w r1, 2(r12)
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mov.w r4, 4(r12)
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mov.w r5, 6(r12)
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mov.w r6, 8(r12)
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mov.w r7, 10(r12)
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mov.w r8, 12(r12)
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mov.w r9, 14(r12)
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mov.w r10, 16(r12)
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clr r12
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ret
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#endif
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.size setjmp , . - setjmp
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.global longjmp
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longjmp:
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; Upon entry r12 points to the jump buffer and
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; r13 contains the value to be returned by setjmp.
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#if defined __MSP430X_LARGE__
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mova @r12+, r14
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mova @r12+, r1
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mova @r12+, r4
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mova @r12+, r5
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mova @r12+, r6
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mova @r12+, r7
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mova @r12+, r8
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mova @r12+, r9
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mova @r12+, r10
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#else
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mov.w @r12+, r14
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mov.w @r12+, r1
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mov.w @r12+, r4
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mov.w @r12+, r5
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mov.w @r12+, r6
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mov.w @r12+, r7
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mov.w @r12+, r8
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mov.w @r12+, r9
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mov.w @r12+, r10
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#endif
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; If caller attempts to return 0, return 1 instead.
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cmp.w #0, r13
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jne .Lnot_zero
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mov.w #1, r13
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.Lnot_zero:
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mov.w r13, r12
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#if defined __MSP430X_LARGE__
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adda #4, r1
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mova r14, r0
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#else
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add.w #2, r1
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mov.w r14, r0
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#endif
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.size longjmp , . - longjmp
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