82 lines
3.0 KiB
ArmAsm
82 lines
3.0 KiB
ArmAsm
/*
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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 | *
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* ------------------------------------------------- *
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* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
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* ------------------------------------------------- *
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* | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | *
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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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* | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
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* ------------------------------------------------- *
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* | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 | *
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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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* | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
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* ------------------------------------------------- *
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* |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | *
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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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* | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
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* ------------------------------------------------- *
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* | v8 | lr | pc | FCTX| DATA| | *
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* ------------------------------------------------- *
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* *
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*******************************************************/
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.file "make_arm_aapcs_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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.syntax unified
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ostd_make_fcontext:
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@ shift address in A1 to lower 16 byte boundary
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bic a1, a1, #15
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@ reserve space for context-data on context-stack
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sub a1, a1, #124
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@ third arg of ostd_make_fcontext() == address of context-function
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str a3, [a1, #104]
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@ compute address of returned transfer_t
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add a2, a1, #108
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mov a3, a2
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str a3, [a1, #64]
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@ compute abs address of label finish
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adr a2, 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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str a2, [a1, #100]
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#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
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#endif
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bx lr @ return pointer to context-data
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finish:
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@ exit code is zero
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mov a1, #0
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@ exit application
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bl _exit@PLT
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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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