libunwind-arm.S revision 303634
1189251Ssam/* Support functions for the unwinder. 2189251Ssam Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. 3189251Ssam Contributed by Paul Brook 4189251Ssam 5189251Ssam This file is free software; you can redistribute it and/or modify it 6189251Ssam under the terms of the GNU General Public License as published by the 7189251Ssam Free Software Foundation; either version 2, or (at your option) any 8189251Ssam later version. 9189251Ssam 10189251Ssam In addition to the permissions in the GNU General Public License, the 11189251Ssam Free Software Foundation gives you unlimited permission to link the 12189251Ssam compiled version of this file into combinations with other programs, 13189251Ssam and to distribute those combinations without any restriction coming 14189251Ssam from the use of this file. (The General Public License restrictions 15189251Ssam do apply in other respects; for example, they cover modification of 16189251Ssam the file, and distribution when not linked into a combine 17189251Ssam executable.) 18189251Ssam 19189251Ssam This file is distributed in the hope that it will be useful, but 20189251Ssam WITHOUT ANY WARRANTY; without even the implied warranty of 21189251Ssam MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22189251Ssam General Public License for more details. 23189251Ssam 24189251Ssam You should have received a copy of the GNU General Public License 25189251Ssam along with this program; see the file COPYING. If not, write to 26189251Ssam the Free Software Foundation, 51 Franklin Street, Fifth Floor, 27189251Ssam Boston, MA 02110-1301, USA. */ 28189251Ssam 29189251Ssam#include <machine/acle-compat.h> 30189251Ssam 31189251Ssam/* Allow the use of VFP instructions */ 32214734Srpaulo#if __ARM_ARCH >= 7 33214734Srpaulo.fpu vfp 34189251Ssam#endif 35189251Ssam 36189251Ssam#ifndef __symbian__ 37189251Ssam 38252726Srpaulo#include "lib1funcs.asm" 39252726Srpaulo 40189251Ssam.macro UNPREFIX name 41189251Ssam .global SYM (\name) 42189251Ssam EQUIV SYM (\name), SYM (__\name) 43189251Ssam.endm 44189251Ssam 45189251Ssam/* r0 points to a 16-word block. Upload these values to the actual core 46214734Srpaulo state. */ 47189251SsamARM_FUNC_START restore_core_regs 48189251Ssam /* We must use sp as the base register when restoring sp. Push the 49 last 3 registers onto the top of the current stack to achieve 50 this. */ 51 add r1, r0, #52 52 ldmia r1, {r3, r4, r5} /* {sp, lr, pc}. */ 53#ifdef __INTERWORKING__ 54 /* Restore pc into ip. */ 55 mov r2, r5 56 stmfd sp!, {r2, r3, r4} 57#else 58 stmfd sp!, {r3, r4, r5} 59#endif 60 /* Don't bother restoring ip. */ 61 ldmia r0, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp} 62 /* Pop the three registers we pushed earlier. */ 63#ifdef __INTERWORKING__ 64 ldmfd sp, {ip, sp, lr} 65 bx ip 66#else 67 ldmfd sp, {sp, lr, pc} 68#endif 69 FUNC_END restore_core_regs 70 UNPREFIX restore_core_regs 71 72/* Load VFP registers d0-d15 from the address in r0. */ 73ARM_FUNC_START gnu_Unwind_Restore_VFP 74 /* Use the generic coprocessor form so that gas doesn't complain 75 on soft-float targets. */ 76#if __ARM_ARCH >= 7 77 fldmiax r0, {d0-d15} 78#else 79 ldc p11,cr0,[r0],{0x21} /* fldmiax r0, {d0-d15} */ 80#endif 81 RET 82 83/* Store VFR regsters d0-d15 to the address in r0. */ 84ARM_FUNC_START gnu_Unwind_Save_VFP 85 /* Use the generic coprocessor form so that gas doesn't complain 86 on soft-float targets. */ 87#if __ARM_ARCH >= 7 88 fstmiax r0, {d0-d15} 89#else 90 stc p11,cr0,[r0],{0x21} /* fstmiax r0, {d0-d15} */ 91#endif 92 RET 93 94/* Wrappers to save core registers, then call the real routine. */ 95 96.macro UNWIND_WRAPPER name nargs 97 ARM_FUNC_START \name 98 /* Create a phase2_vrs structure. */ 99 /* Split reg push in two to ensure the correct value for sp. */ 100 stmfd sp!, {sp, lr, pc} 101 stmfd sp!, {r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, sl, fp, ip} 102 103 /* Demand-save flags, plus an extra word for alignment. */ 104 mov r3, #0 105 stmfd sp!, {r2, r3} 106 107 /* Point r1 at the block. Pass r[0..nargs) unchanged. */ 108 add r\nargs, sp, #4 109#if defined(__thumb__) 110 /* Switch back to thumb mode to avoid interworking hassle. */ 111 adr ip, .L1_\name 112 orr ip, ip, #1 113 bx ip 114 .thumb 115.L1_\name: 116 bl SYM (__gnu\name) __PLT__ 117 ldr r3, [sp, #64] 118 add sp, #72 119 bx r3 120#else 121 bl SYM (__gnu\name) __PLT__ 122 ldr lr, [sp, #64] 123 add sp, sp, #72 124 RET 125#endif 126 FUNC_END \name 127 UNPREFIX \name 128.endm 129 130UNWIND_WRAPPER _Unwind_RaiseException 1 131UNWIND_WRAPPER _Unwind_Resume 1 132UNWIND_WRAPPER _Unwind_Resume_or_Rethrow 1 133UNWIND_WRAPPER _Unwind_ForcedUnwind 3 134UNWIND_WRAPPER _Unwind_Backtrace 2 135 136#endif /* ndef __symbian__ */ 137