libunwind.S revision 169689
1/* Support functions for the unwinder. 2 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. 3 Contributed by Paul Brook 4 5 This file is free software; you can redistribute it and/or modify it 6 under the terms of the GNU General Public License as published by the 7 Free Software Foundation; either version 2, or (at your option) any 8 later version. 9 10 In addition to the permissions in the GNU General Public License, the 11 Free Software Foundation gives you unlimited permission to link the 12 compiled version of this file into combinations with other programs, 13 and to distribute those combinations without any restriction coming 14 from the use of this file. (The General Public License restrictions 15 do apply in other respects; for example, they cover modification of 16 the file, and distribution when not linked into a combine 17 executable.) 18 19 This file is distributed in the hope that it will be useful, but 20 WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22 General Public License for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program; see the file COPYING. If not, write to 26 the Free Software Foundation, 51 Franklin Street, Fifth Floor, 27 Boston, MA 02110-1301, USA. */ 28 29#ifndef __symbian__ 30 31#include "lib1funcs.asm" 32 33.macro UNPREFIX name 34 .global SYM (\name) 35 EQUIV SYM (\name), SYM (__\name) 36.endm 37 38/* r0 points to a 16-word block. Upload these values to the actual core 39 state. */ 40ARM_FUNC_START restore_core_regs 41 /* We must use sp as the base register when restoring sp. Push the 42 last 3 registers onto the top of the current stack to achieve 43 this. */ 44 add r1, r0, #52 45 ldmia r1, {r3, r4, r5} /* {sp, lr, pc}. */ 46#ifdef __INTERWORKING__ 47 /* Restore pc into ip. */ 48 mov r2, r5 49 stmfd sp!, {r2, r3, r4} 50#else 51 stmfd sp!, {r3, r4, r5} 52#endif 53 /* Don't bother restoring ip. */ 54 ldmia r0, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp} 55 /* Pop the three registers we pushed earlier. */ 56#ifdef __INTERWORKING__ 57 ldmfd sp, {ip, sp, lr} 58 bx ip 59#else 60 ldmfd sp, {sp, lr, pc} 61#endif 62 FUNC_END restore_core_regs 63 UNPREFIX restore_core_regs 64 65/* Load VFP registers d0-d15 from the address in r0. */ 66ARM_FUNC_START gnu_Unwind_Restore_VFP 67 /* Use the generic coprocessor form so that gas doesn't complain 68 on soft-float targets. */ 69 ldc p11,cr0,[r0],{0x21} /* fldmiax r0, {d0-d15} */ 70 RET 71 72/* Store VFR regsters d0-d15 to the address in r0. */ 73ARM_FUNC_START gnu_Unwind_Save_VFP 74 /* Use the generic coprocessor form so that gas doesn't complain 75 on soft-float targets. */ 76 stc p11,cr0,[r0],{0x21} /* fstmiax r0, {d0-d15} */ 77 RET 78 79/* Wrappers to save core registers, then call the real routine. */ 80 81.macro UNWIND_WRAPPER name nargs 82 ARM_FUNC_START \name 83 /* Create a phase2_vrs structure. */ 84 /* Split reg push in two to ensure the correct value for sp. */ 85 stmfd sp!, {sp, lr, pc} 86 stmfd sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip} 87 88 /* Demand-save flags, plus an extra word for alignment. */ 89 mov r3, #0 90 stmfd sp!, {r2, r3} 91 92 /* Point r1 at the block. Pass r[0..nargs) unchanged. */ 93 add r\nargs, sp, #4 94#if defined(__thumb__) 95 /* Switch back to thumb mode to avoid interworking hassle. */ 96 adr ip, .L1_\name 97 orr ip, ip, #1 98 bx ip 99 .thumb 100.L1_\name: 101 bl SYM (__gnu\name) __PLT__ 102 ldr r3, [sp, #64] 103 add sp, #72 104 bx r3 105#else 106 bl SYM (__gnu\name) __PLT__ 107 ldr lr, [sp, #64] 108 add sp, sp, #72 109 RET 110#endif 111 FUNC_END \name 112 UNPREFIX \name 113.endm 114 115UNWIND_WRAPPER _Unwind_RaiseException 1 116UNWIND_WRAPPER _Unwind_Resume 1 117UNWIND_WRAPPER _Unwind_Resume_or_Rethrow 1 118UNWIND_WRAPPER _Unwind_ForcedUnwind 3 119 120#endif /* __symbian__ */ 121