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/*
Copyright Oliver Kowalke 2009.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
/*******************************************************
* *
* ------------------------------------------------- *
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
* ------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
* | F20 | F22 | F24 | F26 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | *
* ------------------------------------------------- *
* | F28 | F30 | S0 | S1 | S2 | S3 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
* ------------------------------------------------- *
* | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | *
* ------------------------------------------------- *
* | S4 | S5 | S6 | S7 | FP |hiddn| RA | PC | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
* ------------------------------------------------- *
* | ABI ARGS | GP | FCTX| DATA| | *
* ------------------------------------------------- *
* *
* *****************************************************/
.file "ontop_mips32_o32_elf_gas.S"
.text
.globl ontop_fcontext
.hidden ontop_fcontext
.align 2
.type ontop_fcontext,@function
.ent ontop_fcontext
ontop_fcontext:
# reserve space on stack
addiu $sp, $sp, -96
sw $s0, 48($sp) # save S0
sw $s1, 52($sp) # save S1
sw $s2, 56($sp) # save S2
sw $s3, 60($sp) # save S3
sw $s4, 64($sp) # save S4
sw $s5, 68($sp) # save S5
sw $s6, 72($sp) # save S6
sw $s7, 76($sp) # save S7
sw $fp, 80($sp) # save FP
sw $a0, 84($sp) # save hidden, address of returned transfer_t
sw $ra, 88($sp) # save RA
sw $ra, 92($sp) # save RA as PC
#if defined(__mips_hard_float)
s.d $f20, ($sp) # save F20
s.d $f22, 8($sp) # save F22
s.d $f24, 16($sp) # save F24
s.d $f26, 24($sp) # save F26
s.d $f28, 32($sp) # save F28
s.d $f30, 40($sp) # save F30
#endif
# store SP (pointing to context-data) in A0
move $a0, $sp
# restore SP (pointing to context-data) from A1
move $sp, $a1
#if defined(__mips_hard_float)
l.d $f20, ($sp) # restore F20
l.d $f22, 8($sp) # restore F22
l.d $f24, 16($sp) # restore F24
l.d $f26, 24($sp) # restore F26
l.d $f28, 32($sp) # restore F28
l.d $f30, 40($sp) # restore F30
#endif
lw $s0, 48($sp) # restore S0
lw $s1, 52($sp) # restore S1
lw $s2, 56($sp) # restore S2
lw $s3, 60($sp) # restore S3
lw $s4, 64($sp) # restore S4
lw $s5, 68($sp) # restore S5
lw $s6, 72($sp) # restore S6
lw $s7, 76($sp) # restore S7
lw $fp, 80($sp) # restore FP
lw $v0, 84($sp) # restore hidden, address of returned transfer_t
lw $ra, 88($sp) # restore RA
# load PC
move $t9, $a3
# adjust stack
addiu $sp, $sp, 96
# return transfer_t from jump
sw $a0, ($v0) # fctx of transfer_t
sw $a2, 4($v0) # data of transfer_t
# pass transfer_t as first arg in context function
# A0 == hidden, A1 == fctx, A2 == data
move $a1, $a0
move $a0, $v0
# jump to context
jr $t9
.end ontop_fcontext
.size ontop_fcontext, .-ontop_fcontext
/* Mark that we don't need executable stack. */
.section .note.GNU-stack,"",%progbits
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