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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| *
- * ------------------------------------------------- *
- * | d8 | d9 | d10 | d11 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
- * ------------------------------------------------- *
- * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
- * ------------------------------------------------- *
- * | d12 | d13 | d14 | d15 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
- * ------------------------------------------------- *
- * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
- * ------------------------------------------------- *
- * | x19 | x20 | x21 | x22 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
- * ------------------------------------------------- *
- * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
- * ------------------------------------------------- *
- * | x23 | x24 | x25 | x26 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
- * ------------------------------------------------- *
- * | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| *
- * ------------------------------------------------- *
- * | x27 | x28 | FP | LR | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 40 | 41 | 42 | 43 | | | *
- * ------------------------------------------------- *
- * | 0xa0| 0xa4| 0xa8| 0xac| | | *
- * ------------------------------------------------- *
- * | PC | align | | | *
- * ------------------------------------------------- *
- * *
- *******************************************************/
- .text
- .align 2
- .global ontop_fcontext
- .type ontop_fcontext, %function
- ontop_fcontext:
- # prepare stack for GP + FPU
- sub sp, sp, #0xb0
- # save d8 - d15
- stp d8, d9, [sp, #0x00]
- stp d10, d11, [sp, #0x10]
- stp d12, d13, [sp, #0x20]
- stp d14, d15, [sp, #0x30]
- # save x19-x30
- stp x19, x20, [sp, #0x40]
- stp x21, x22, [sp, #0x50]
- stp x23, x24, [sp, #0x60]
- stp x25, x26, [sp, #0x70]
- stp x27, x28, [sp, #0x80]
- stp x29, x30, [sp, #0x90]
- # save LR as PC
- str x30, [sp, #0xa0]
- # store RSP (pointing to context-data) in X5
- mov x4, sp
- # restore RSP (pointing to context-data) from X1
- mov sp, x0
- # load d8 - d15
- ldp d8, d9, [sp, #0x00]
- ldp d10, d11, [sp, #0x10]
- ldp d12, d13, [sp, #0x20]
- ldp d14, d15, [sp, #0x30]
- # load x19-x30
- ldp x19, x20, [sp, #0x40]
- ldp x21, x22, [sp, #0x50]
- ldp x23, x24, [sp, #0x60]
- ldp x25, x26, [sp, #0x70]
- ldp x27, x28, [sp, #0x80]
- ldp x29, x30, [sp, #0x90]
- # return transfer_t from jump
- # pass transfer_t as first arg in context function
- # X0 == FCTX, X1 == DATA
- mov x0, x4
- # skip pc
- # restore stack from GP + FPU
- add sp, sp, #0xb0
- # jump to ontop-function
- ret x2
- .size ontop_fcontext,.-ontop_fcontext
- # Mark that we don't need executable stack.
- .section .note.GNU-stack,"",%progbits
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