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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 | *
- * ------------------------------------------------- *
- * | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
- * ------------------------------------------------- *
- * | TOC | R14 | R15 | R16 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
- * ------------------------------------------------- *
- * | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | *
- * ------------------------------------------------- *
- * | R17 | R18 | R19 | R20 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
- * ------------------------------------------------- *
- * | 64 | 68 | 72 | 76 | 80 | 84 | 88 | 92 | *
- * ------------------------------------------------- *
- * | R21 | R22 | R23 | R24 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
- * ------------------------------------------------- *
- * | 96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 | *
- * ------------------------------------------------- *
- * | R25 | R26 | R27 | R28 | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
- * ------------------------------------------------- *
- * | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 | *
- * ------------------------------------------------- *
- * | R29 | R30 | R31 | hidden | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | *
- * ------------------------------------------------- *
- * | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 | *
- * ------------------------------------------------- *
- * | CR | LR | PC | back-chain| *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | *
- * ------------------------------------------------- *
- * | 192 | 196 | 200 | 204 | 208 | 212 | 216 | 220 | *
- * ------------------------------------------------- *
- * | cr saved | lr saved | compiler | linker | *
- * ------------------------------------------------- *
- * ------------------------------------------------- *
- * | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | *
- * ------------------------------------------------- *
- * | 224 | 228 | 232 | 236 | 240 | 244 | 248 | 252 | *
- * ------------------------------------------------- *
- * | TOC saved | FCTX | DATA | | *
- * ------------------------------------------------- *
- * *
- .text
- .globl _make_fcontext
- _make_fcontext:
- ; save return address into R6
- mflr r6
- ; first arg of make_fcontext() == top address of context-function
- ; shift address in R3 to lower 16 byte boundary
- clrrwi r3, r3, 4
- ; reserve space for context-data on context-stack
- ; including 64 byte of linkage + parameter area (R1 16 == 0)
- subi r3, r3, 248
- ; third arg of make_fcontext() == address of context-function
- stw r5, 176(r3)
- ; set back-chain to zero
- li %r0, 0
- std %r0, 184(%r3)
- ; compute address of returned transfer_t
- addi %r0, %r3, 232
- mr %r4, %r0
- std %r4, 152(%r3)
- ; load LR
- mflr r0
- ; jump to label 1
- bl l1
- l1:
- ; load LR into R4
- mflr r4
- ; compute abs address of label finish
- addi r4, r4, lo16((finish - .) + 4)
- ; restore LR
- mtlr r0
- ; save address of finish as return-address for context-function
- ; will be entered after context-function returns
- std r4, 168(r3)
- ; restore return address from R6
- mtlr r6
- blr ; return pointer to context-data
- finish:
- ; save return address into R0
- mflr r0
- ; save return address on stack, set up stack frame
- stw r0, 8(r1)
- ; allocate stack space, R1 16 == 0
- stwu r1, -32(r1)
- ; set return value to zero
- li r3, 0
- ; exit application
- bl __exit
- nop
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