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- /*
- Copyright Edward Nevill + Oliver Kowalke 2015
- 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 | *
- * ------------------------------------------------- *
- * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
- * ------------------------------------------------- *
- * | x19 | x20 | x21 | x22 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
- * ------------------------------------------------- *
- * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
- * ------------------------------------------------- *
- * | x23 | x24 | x25 | x26 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
- * ------------------------------------------------- *
- * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
- * ------------------------------------------------- *
- * | x27 | x28 | FP | LR | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
- * ------------------------------------------------- *
- * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
- * ------------------------------------------------- *
- * | PC | align | | | *
- * ------------------------------------------------- *
- * *
- *******************************************************/
- # .cpu generic+fp+simd
- .text
- .align 2
- .global make_fcontext
- .type make_fcontext, %function
- make_fcontext:
- # shift address in x0 (allocated stack) to lower 16 byte boundary
- and x0, x0, ~0xF
- # reserve space for context-data on context-stack
- sub x0, x0, #0x70
- # third arg of make_fcontext() == address of context-function
- # store address as a PC to jump in
- str x2, [x0, #0x60]
- # save address of finish as return-address for context-function
- # will be entered after context-function returns (LR register)
- adr x1, finish
- str x1, [x0, #0x58]
- ret x30 // return pointer to context-data (x0)
- finish:
- # exit code is zero
- mov x0, #0
- # exit application
- bl _exit
- .size make_fcontext,.-make_fcontext
- # Mark that we don't need executable stack.
- .section .note.GNU-stack,"",%progbits
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