projects / ceph.git / blame
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|---|---|---|
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1 | /* |
| 2 | Copyright Oliver Kowalke 2009. | |
| 3 | Distributed under the Boost Software License, Version 1.0. | |
| 4 | (See accompanying file LICENSE_1_0.txt or copy at | |
| 5 | http://www.boost.org/LICENSE_1_0.txt) | |
| 6 | */ | |
| 7 | ||
| 8 | /******************************************************* | |
| 9 | * * | |
| 10 | * ------------------------------------------------- * | |
| 11 | * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | * | |
| 12 | * ------------------------------------------------- * | |
| 13 | * | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| * | |
| 14 | * ------------------------------------------------- * | |
| b32b8144 | 15 | * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | * |
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16 | * ------------------------------------------------- * |
| 17 | * ------------------------------------------------- * | |
| 18 | * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * | |
| 19 | * ------------------------------------------------- * | |
| 20 | * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * | |
| 21 | * ------------------------------------------------- * | |
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22 | * | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 | * |
| 23 | * ------------------------------------------------- * | |
| 24 | * ------------------------------------------------- * | |
| 25 | * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | * | |
| 26 | * ------------------------------------------------- * | |
| 27 | * | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| * | |
| 28 | * ------------------------------------------------- * | |
| 29 | * |hiddn| v1 | v2 | v3 | v4 | v5 | v6 | v7 | * | |
| 30 | * ------------------------------------------------- * | |
| 31 | * ------------------------------------------------- * | |
| 32 | * | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | * | |
| 33 | * ------------------------------------------------- * | |
| 34 | * | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| * | |
| 35 | * ------------------------------------------------- * | |
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36 | * | v8 | lr | pc | FCTX| DATA| | * |
| 37 | * ------------------------------------------------- * | |
| 38 | * * | |
| 39 | *******************************************************/ | |
| 40 | ||
| 92f5a8d4 | 41 | .file "ontop_arm_aapcs_elf_gas.S" |
| 7c673cae FG |
42 | .text |
| 43 | .globl ontop_fcontext | |
| 44 | .align 2 | |
| 45 | .type ontop_fcontext,%function | |
| 92f5a8d4 | 46 | .syntax unified |
| 7c673cae FG |
47 | ontop_fcontext: |
| 48 | @ save LR as PC | |
| 49 | push {lr} | |
| 50 | @ save hidden,V1-V8,LR | |
| 51 | push {a1,v1-v8,lr} | |
| 52 | ||
| b32b8144 FG |
53 | @ prepare stack for FPU |
| 54 | sub sp, sp, #64 | |
| 55 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) | |
| 56 | @ save S16-S31 | |
| 57 | vstmia sp, {d8-d15} | |
| 58 | #endif | |
| 59 | ||
| 7c673cae FG |
60 | @ store RSP (pointing to context-data) in A1 |
| 61 | mov a1, sp | |
| 62 | ||
| 63 | @ restore RSP (pointing to context-data) from A2 | |
| 64 | mov sp, a2 | |
| 65 | ||
| 66 | @ store parent context in A2 | |
| 67 | mov a2, a1 | |
| 68 | ||
| b32b8144 FG |
69 | #if (defined(__VFP_FP__) && !defined(__SOFTFP__)) |
| 70 | @ restore S16-S31 | |
| 71 | vldmia sp, {d8-d15} | |
| 72 | #endif | |
| 73 | @ prepare stack for FPU | |
| 74 | add sp, sp, #64 | |
| 75 | ||
| 7c673cae FG |
76 | @ restore hidden,V1-V8,LR |
| 77 | pop {a1,v1-v8,lr} | |
| 78 | ||
| 79 | @ return transfer_t from jump | |
| 80 | str a2, [a1, #0] | |
| 81 | str a3, [a1, #4] | |
| 82 | @ pass transfer_t as first arg in context function | |
| 83 | @ A1 == hidden, A2 == FCTX, A3 == DATA | |
| 84 | ||
| 85 | @ skip PC | |
| 86 | add sp, sp, #4 | |
| 87 | ||
| 88 | @ jump to ontop-function | |
| 89 | bx a4 | |
| 90 | .size ontop_fcontext,.-ontop_fcontext | |
| 91 | ||
| 92 | @ Mark that we don't need executable stack. | |
| 93 | .section .note.GNU-stack,"",%progbits |