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79 lines
4.0 KiB
79 lines
4.0 KiB
/*
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Copyright Oliver Kowalke 2009.
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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 | 8 | 9 | *
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* ------------------------------------------------------------- *
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* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| 0x20| 0x24| *
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* ------------------------------------------------------------- *
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* | v1 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | sp | lr | *
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* ------------------------------------------------------------- *
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* ------------------------------------------------------------- *
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* | 10 | | *
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* ------------------------------------------------------------- *
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* | 0x28| | *
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* ------------------------------------------------------------- *
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* | pc | | *
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* ------------------------------------------------------------- *
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* ------------------------------------------------------------- *
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* | 11 | 12 | | *
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* ------------------------------------------------------------- *
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* | 0x2c| 0x30| | *
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* ------------------------------------------------------------- *
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* | sp | size| | *
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* ------------------------------------------------------------- *
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* ------------------------------------------------------------- *
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* | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | *
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* ------------------------------------------------------------- *
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* | 0x34| 0x38|0x3c| 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58 | *
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* ------------------------------------------------------------- *
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* | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | s24 | s25 | *
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* ------------------------------------------------------------- *
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* ------------------------------------------------------------- *
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* | 23 | 24 | 25 | 26 | 27 | 28 | | *
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* ------------------------------------------------------------- *
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* | 0x5c| 0x60| 0x64| 0x68| 0x6c| 0x70| | *
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* ------------------------------------------------------------- *
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* | s26 | s27 | s28 | s29 | s30 | s31 | | *
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* ------------------------------------------------------------- *
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* *
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* *****************************************************************/
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.text
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.globl make_fcontext
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.align 2
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.type make_fcontext,%function
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make_fcontext:
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mov a4, a1 @ save address of context stack (base) A4
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sub a1, a1, #116 @ reserve space for fcontext_t at top of context stack
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@ shift address in A1 to lower 16 byte boundary
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@ == pointer to fcontext_t and address of context stack
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bic a1, a1, #15
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str a4, [a1,#44] @ save address of context stack (base) in fcontext_t
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str a2, [a1,#48] @ save context stack size in fcontext_t
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str a3, [a1,#40] @ save address of context function in fcontext_t
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str a1, [a1,#32] @ save address in A4 as stack pointer for context function
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adr a2, finish @ compute abs address of label finish
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str a2, [a1,#36] @ save address of finish as return address for context function
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@ entered after context function returns
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bx lr
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finish:
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@ SP points to same addras SP on entry of context function
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mov a1, #0 @ exit code is zero
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bl _exit@PLT @ exit application
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.size make_fcontext,.-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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