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 * ------------------------------------------------- * 15 * | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 | * 16 * ------------------------------------------------- * 17 * ------------------------------------------------- * 18 * | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | * 19 * ------------------------------------------------- * 20 * | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| * 21 * ------------------------------------------------- * 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 * | sjlj| v1 | v2 | v3 | v4 | v5 | v6 | v7 | 30 * ------------------------------------------------- * 31 * ------------------------------------------------- * 32 * | 24 | 25 | 26 | | * 33 * ------------------------------------------------- * 34 * | 0x60| 0x64| 0x68| | * 35 * ------------------------------------------------- * 36 * | v8 | lr | pc | | * 37 * ------------------------------------------------- * 38 * * 39 * *****************************************************/ 40 41.text 42.globl _jump_fcontext 43.align 2 44_jump_fcontext: 45 @ save LR as PC 46 push {lr} 47 @ save V1-V8,LR 48 push {v1-v8,lr} 49 50 @ locate TLS to save/restore SjLj handler 51 mrc p15, 0, v2, c13, c0, #3 52 bic v2, v2, #3 53 54 @ load TLS[__PTK_LIBC_DYLD_Unwind_SjLj_Key] 55 ldr v1, [v2, #72] 56 @ save SjLj handler 57 push {v1} 58 59 @ prepare stack for FPU 60 sub sp, sp, #64 61 62#if (defined(__VFP_FP__) && !defined(__SOFTFP__)) 63 @ test if fpu env should be preserved 64 cmp a4, #0 65 beq 1f 66 67 @ save S16-S31 68 vstmia sp, {d8-d15} 69 701: 71#endif 72 73 @ store RSP (pointing to context-data) in A1 74 str sp, [a1] 75 76 @ restore RSP (pointing to context-data) from A2 77 mov sp, a2 78 79#if (defined(__VFP_FP__) && !defined(__SOFTFP__)) 80 @ test if fpu env should be preserved 81 cmp a4, #0 82 beq 2f 83 84 @ restore S16-S31 85 vldmia sp, {d8-d15} 86 872: 88#endif 89 90 @ prepare stack for FPU 91 add sp, sp, #64 92 93 @ restore SjLj handler 94 pop {v1} 95 @ store SjLj handler in TLS 96 str v1, [v2, #72] 97 98 @ use third arg as return value after jump 99 @ and as first arg in context function 100 mov a1, a3 101 102 @ restore v1-V8,LR,PC 103 pop {v1-v8,lr,pc} 104