97 lines
3.7 KiB
ArmAsm
97 lines
3.7 KiB
ArmAsm
/*
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Copyright Jiaxun Yang 2018.
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*******************************************************
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* *
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* ------------------------------------------------- *
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* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
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* ------------------------------------------------- *
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* | 0 | 8 | 16 | 24 | *
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* ------------------------------------------------- *
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* | F24 | F25 | F26 | F27 | *
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* ------------------------------------------------- *
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* ------------------------------------------------- *
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* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
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* ------------------------------------------------- *
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* | 32 | 40 | 48 | 56 | *
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* ------------------------------------------------- *
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* | F28 | F29 | F30 | F31 | *
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* ------------------------------------------------- *
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* ------------------------------------------------- *
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* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
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* ------------------------------------------------- *
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* | 64 | 72 | 80 | 88 | *
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* ------------------------------------------------- *
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* | S0 | S1 | S2 | S3 | *
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* ------------------------------------------------- *
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* ------------------------------------------------- *
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* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
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* ------------------------------------------------- *
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* | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
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* ------------------------------------------------- *
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* | S4 | S5 | S6 | S7 | *
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* ------------------------------------------------- *
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* ------------------------------------------------- *
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* | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
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* ------------------------------------------------- *
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* | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
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* ------------------------------------------------- *
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* | FP | GP | RA | PC | *
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* ------------------------------------------------- *
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* *
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* *****************************************************/
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.file "make_mips64_n64_elf_gas.S"
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.text
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.globl ostd_make_fcontext
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.align 2
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.type ostd_make_fcontext,@function
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.ent ostd_make_fcontext
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ostd_make_fcontext:
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#ifdef __PIC__
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.set noreorder
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.cpload $t9
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.set reorder
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#endif
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# shift address in A0 to lower 16 byte boundary
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li $v1, 0xfffffffffffffff0
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and $v0, $v1, $a0
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# reserve space for context-data on context-stack
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daddiu $v0, $v0, -160
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# third arg of ostd_make_fcontext() == address of context-function
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sd $a2, 152($v0)
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# save global pointer in context-data
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sd $gp, 136($v0)
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# psudo instruction compute abs address of label finish based on GP
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dla $t9, finish
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# save address of finish as return-address for context-function
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# will be entered after context-function returns
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sd $t9, 144($v0)
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jr $ra # return pointer to context-data
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finish:
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# reload our gp register (needed for la)
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daddiu $t0, $sp, -160
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ld $gp, 136($t0)
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# call _exit(0)
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# the previous function should have left the 16 bytes incoming argument
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# area on the stack which we reuse for calling _exit
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dla $t9, _exit
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move $a0, $zero
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jr $t9
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.end ostd_make_fcontext
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.size ostd_make_fcontext, .-ostd_make_fcontext
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/* Mark that we don't need executable stack. */
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.section .note.GNU-stack,"",%progbits
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