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110 lines
4.0 KiB
ArmAsm
110 lines
4.0 KiB
ArmAsm
/*
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Copyright Edward Nevill + Oliver Kowalke 2015
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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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* | d8 | d9 | d10 | d11 | *
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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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* | d12 | d13 | d14 | d15 | *
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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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* | x19 | x20 | x21 | x22 | *
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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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* | x23 | x24 | x25 | x26 | *
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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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* | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| *
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* ------------------------------------------------- *
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* | x27 | x28 | FP | LR | *
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* ------------------------------------------------- *
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* ------------------------------------------------- *
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* | 40 | 41 | 42 | 43 | | | *
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* ------------------------------------------------- *
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* | 0xa0| 0xa4| 0xa8| 0xac| | | *
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* ------------------------------------------------- *
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* | PC | align | | | *
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* ------------------------------------------------- *
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* *
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*******************************************************/
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.text
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.globl _jump_fcontext
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.balign 16
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_jump_fcontext:
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; prepare stack for GP + FPU
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sub sp, sp, #0xb0
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; save d8 - d15
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stp d8, d9, [sp, #0x00]
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stp d10, d11, [sp, #0x10]
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stp d12, d13, [sp, #0x20]
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stp d14, d15, [sp, #0x30]
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; save x19-x30
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stp x19, x20, [sp, #0x40]
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stp x21, x22, [sp, #0x50]
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stp x23, x24, [sp, #0x60]
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stp x25, x26, [sp, #0x70]
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stp x27, x28, [sp, #0x80]
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stp fp, lr, [sp, #0x90]
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; save LR as PC
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str lr, [sp, #0xa0]
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; store RSP (pointing to context-data) in X0
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mov x4, sp
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; restore RSP (pointing to context-data) from X1
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mov sp, x0
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; load d8 - d15
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ldp d8, d9, [sp, #0x00]
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ldp d10, d11, [sp, #0x10]
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ldp d12, d13, [sp, #0x20]
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ldp d14, d15, [sp, #0x30]
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; load x19-x30
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ldp x19, x20, [sp, #0x40]
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ldp x21, x22, [sp, #0x50]
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ldp x23, x24, [sp, #0x60]
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ldp x25, x26, [sp, #0x70]
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ldp x27, x28, [sp, #0x80]
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ldp fp, lr, [sp, #0x90]
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; return transfer_t from jump
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; pass transfer_t as first arg in context function
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; X0 == FCTX, X1 == DATA
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mov x0, x4
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; load pc
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ldr x4, [sp, #0xa0]
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; restore stack from GP + FPU
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add sp, sp, #0xb0
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ret x4
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