| 1 | #
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| 2 | # Copyright (C) 2003-2004 Jakub Jermar
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | .text
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| 30 |
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| 31 | .set noat
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| 32 | .set noreorder
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| 33 | .set nomacro
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| 34 |
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| 35 |
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| 36 | #include <arch/asm/regname.h>
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| 37 | #include <libarch/context_offset.h>
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| 38 |
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| 39 | .global context_save
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| 40 | .global context_restore
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| 41 |
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| 42 | .macro CONTEXT_STORE r
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| 43 | sw $s0,OFFSET_S0(\r)
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| 44 | sw $s1,OFFSET_S1(\r)
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| 45 | sw $s2,OFFSET_S2(\r)
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| 46 | sw $s3,OFFSET_S3(\r)
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| 47 | sw $s4,OFFSET_S4(\r)
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| 48 | sw $s5,OFFSET_S5(\r)
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| 49 | sw $s6,OFFSET_S6(\r)
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| 50 | sw $s7,OFFSET_S7(\r)
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| 51 | sw $s8,OFFSET_S8(\r)
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| 52 | sw $gp,OFFSET_GP(\r)
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| 53 | sw $k1,OFFSET_TLS(\r)
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| 54 |
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| 55 | sw $ra,OFFSET_PC(\r)
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| 56 | sw $sp,OFFSET_SP(\r)
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| 57 | .endm
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| 58 |
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| 59 | .macro CONTEXT_LOAD r
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| 60 | lw $s0,OFFSET_S0(\r)
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| 61 | lw $s1,OFFSET_S1(\r)
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| 62 | lw $s2,OFFSET_S2(\r)
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| 63 | lw $s3,OFFSET_S3(\r)
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| 64 | lw $s4,OFFSET_S4(\r)
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| 65 | lw $s5,OFFSET_S5(\r)
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| 66 | lw $s6,OFFSET_S6(\r)
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| 67 | lw $s7,OFFSET_S7(\r)
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| 68 | lw $s8,OFFSET_S8(\r)
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| 69 | lw $gp,OFFSET_GP(\r)
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| 70 | lw $k1,OFFSET_TLS(\r)
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| 71 |
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| 72 | lw $ra,OFFSET_PC(\r)
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| 73 | lw $sp,OFFSET_SP(\r)
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| 74 | .endm
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| 75 |
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| 76 | context_save:
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| 77 | CONTEXT_STORE $a0
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| 78 |
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| 79 | # context_save returns 1
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| 80 | j $ra
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| 81 | li $v0, 1
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| 82 |
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| 83 | context_restore:
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| 84 | CONTEXT_LOAD $a0
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| 85 |
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| 86 | # context_restore returns 0
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| 87 | j $ra
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| 88 | xor $v0, $v0
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