1 /* libunwind - a platform-independent unwind library 2 Copyright (C) 2008 CodeSourcery 3 Copyright 2011 Linaro Limited 4 Copyright (C) 2012 Tommi Rantala <tt.rantala (at) gmail.com> 5 6 This file is part of libunwind. 7 8 Permission is hereby granted, free of charge, to any person obtaining 9 a copy of this software and associated documentation files (the 10 "Software"), to deal in the Software without restriction, including 11 without limitation the rights to use, copy, modify, merge, publish, 12 distribute, sublicense, and/or sell copies of the Software, and to 13 permit persons to whom the Software is furnished to do so, subject to 14 the following conditions: 15 16 The above copyright notice and this permission notice shall be 17 included in all copies or substantial portions of the Software. 18 19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 26 27 #if defined(__ANDROID__) 28 #include <asm/sigcontext.h> 29 #endif 30 31 #include "unwind_i.h" 32 #include "offsets.h" 33 34 #ifndef UNW_REMOTE_ONLY 35 36 HIDDEN inline int 37 arm_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 38 { 39 #ifdef __linux__ 40 struct cursor *c = (struct cursor *) cursor; 41 unw_tdep_context_t *uc = c->dwarf.as_arg; 42 43 if (c->sigcontext_format == ARM_SCF_NONE) 44 { 45 /* Since there are no signals involved here we restore the non scratch 46 registers only. */ 47 unsigned long regs[10]; 48 regs[0] = uc->regs[4]; 49 regs[1] = uc->regs[5]; 50 regs[2] = uc->regs[6]; 51 regs[3] = uc->regs[7]; 52 regs[4] = uc->regs[8]; 53 regs[5] = uc->regs[9]; 54 regs[6] = uc->regs[10]; 55 regs[7] = uc->regs[11]; /* FP */ 56 regs[8] = uc->regs[13]; /* SP */ 57 regs[9] = uc->regs[14]; /* LR */ 58 59 struct regs_overlay { 60 char x[sizeof(regs)]; 61 }; 62 63 asm __volatile__ ( 64 "ldmia %0, {r4-r12, lr}\n" 65 "mov sp, r12\n" 66 "bx lr\n" 67 : : "r" (regs), 68 "m" (*(struct regs_overlay *)regs) 69 ); 70 } 71 else 72 { 73 /* In case a signal frame is involved, we're using its trampoline which 74 calls sigreturn. */ 75 struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr; 76 sc->arm_r0 = uc->regs[0]; 77 sc->arm_r1 = uc->regs[1]; 78 sc->arm_r2 = uc->regs[2]; 79 sc->arm_r3 = uc->regs[3]; 80 sc->arm_r4 = uc->regs[4]; 81 sc->arm_r5 = uc->regs[5]; 82 sc->arm_r6 = uc->regs[6]; 83 sc->arm_r7 = uc->regs[7]; 84 sc->arm_r8 = uc->regs[8]; 85 sc->arm_r9 = uc->regs[9]; 86 sc->arm_r10 = uc->regs[10]; 87 sc->arm_fp = uc->regs[11]; /* FP */ 88 sc->arm_ip = uc->regs[12]; /* IP */ 89 sc->arm_sp = uc->regs[13]; /* SP */ 90 sc->arm_lr = uc->regs[14]; /* LR */ 91 sc->arm_pc = uc->regs[15]; /* PC */ 92 /* clear the ITSTATE bits. */ 93 sc->arm_cpsr &= 0xf9ff03ffUL; 94 95 /* Set the SP and the PC in order to continue execution at the modified 96 trampoline which restores the signal mask and the registers. */ 97 asm __volatile__ ( 98 "mov sp, %0\n" 99 "bx %1\n" 100 : : "r" (c->sigcontext_sp), "r" (c->sigcontext_pc) 101 ); 102 } 103 unreachable(); 104 #else 105 printf ("%s: implement me\n", __FUNCTION__); 106 #endif 107 return -UNW_EINVAL; 108 } 109 110 #endif /* !UNW_REMOTE_ONLY */ 111 112 static inline void 113 establish_machine_state (struct cursor *c) 114 { 115 unw_addr_space_t as = c->dwarf.as; 116 void *arg = c->dwarf.as_arg; 117 unw_fpreg_t fpval; 118 unw_word_t val; 119 int reg; 120 121 Debug (8, "copying out cursor state\n"); 122 123 for (reg = 0; reg <= UNW_REG_LAST; ++reg) 124 { 125 Debug (16, "copying %s %d\n", unw_regname (reg), reg); 126 if (unw_is_fpreg (reg)) 127 { 128 if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0) 129 as->acc.access_fpreg (as, reg, &fpval, 1, arg); 130 } 131 else 132 { 133 if (tdep_access_reg (c, reg, &val, 0) >= 0) 134 as->acc.access_reg (as, reg, &val, 1, arg); 135 } 136 } 137 } 138 139 PROTECTED int 140 unw_resume (unw_cursor_t *cursor) 141 { 142 struct cursor *c = (struct cursor *) cursor; 143 144 Debug (1, "(cursor=%p)\n", c); 145 146 if (!c->dwarf.ip) 147 { 148 /* This can happen easily when the frame-chain gets truncated 149 due to bad or missing unwind-info. */ 150 Debug (1, "refusing to resume execution at address 0\n"); 151 return -UNW_EINVAL; 152 } 153 154 establish_machine_state (c); 155 156 return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c, 157 c->dwarf.as_arg); 158 } 159
