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- /*
- Copyright Oliver Kowalke 2009.
- 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| *
- * ------------------------------------------------- *
- * |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
- * ------------------------------------------------- *
- * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
- * ------------------------------------------------- *
- * | v8 | lr | pc | FCTX| DATA| | *
- * ------------------------------------------------- *
- * *
- *******************************************************/
- .text
- .globl make_fcontext
- .align 2
- .type make_fcontext,%function
- make_fcontext:
- @ shift address in A1 to lower 16 byte boundary
- bic a1, a1, #15
- @ reserve space for context-data on context-stack
- sub a1, a1, #60
- @ third arg of make_fcontext() == address of context-function
- str a3, [a1, #40]
- @ compute address of returned transfer_t
- add a2, a1, #44
- mov a3, a2
- str a3, [a1, #0]
- @ compute abs address of label finish
- adr a2, finish
- @ save address of finish as return-address for context-function
- @ will be entered after context-function returns
- str a2, [a1, #36]
- bx lr @ return pointer to context-data
- finish:
- @ exit code is zero
- mov a1, #0
- @ exit application
- bl _exit@PLT
- .size make_fcontext,.-make_fcontext
- @ Mark that we don't need executable stack.
- .section .note.GNU-stack,"",%progbits
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