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 #include "unwind_i.h" 28 #include "offsets.h" 29 30 #ifndef UNW_REMOTE_ONLY 31 32 HIDDEN inline int 33 sh_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 34 { 35 #ifdef __linux__ 36 struct cursor *c = (struct cursor *) cursor; 37 unw_tdep_context_t *uc = c->dwarf.as_arg; 38 39 if (c->sigcontext_format == SH_SCF_NONE) 40 { 41 /* Since there are no signals involved here we restore the non scratch 42 registers only. */ 43 unsigned long regs[8]; 44 regs[0] = uc->uc_mcontext.gregs[8]; 45 regs[1] = uc->uc_mcontext.gregs[9]; 46 regs[2] = uc->uc_mcontext.gregs[10]; 47 regs[3] = uc->uc_mcontext.gregs[11]; 48 regs[4] = uc->uc_mcontext.gregs[12]; 49 regs[5] = uc->uc_mcontext.gregs[13]; 50 regs[6] = uc->uc_mcontext.gregs[14]; 51 regs[7] = uc->uc_mcontext.gregs[15]; 52 unsigned long pc = uc->uc_mcontext.pr; 53 54 struct regs_overlay { 55 char x[sizeof(regs)]; 56 }; 57 58 asm volatile ( 59 "mov.l @%0+, r8\n" 60 "mov.l @%0+, r9\n" 61 "mov.l @%0+, r10\n" 62 "mov.l @%0+, r11\n" 63 "mov.l @%0+, r12\n" 64 "mov.l @%0+, r13\n" 65 "mov.l @%0+, r14\n" 66 "mov.l @%0, r15\n" 67 "lds %1, pr\n" 68 "rts\n" 69 "nop\n" 70 : 71 : "r" (regs), 72 "r" (pc), 73 "m" (*(struct regs_overlay *)regs) 74 ); 75 } 76 else 77 { 78 /* In case a signal frame is involved, we're using its trampoline which 79 calls sigreturn. */ 80 struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr; 81 sc->sc_regs[0] = uc->uc_mcontext.gregs[0]; 82 sc->sc_regs[1] = uc->uc_mcontext.gregs[1]; 83 sc->sc_regs[2] = uc->uc_mcontext.gregs[2]; 84 sc->sc_regs[3] = uc->uc_mcontext.gregs[3]; 85 sc->sc_regs[4] = uc->uc_mcontext.gregs[4]; 86 sc->sc_regs[5] = uc->uc_mcontext.gregs[5]; 87 sc->sc_regs[6] = uc->uc_mcontext.gregs[6]; 88 sc->sc_regs[7] = uc->uc_mcontext.gregs[7]; 89 sc->sc_regs[8] = uc->uc_mcontext.gregs[8]; 90 sc->sc_regs[9] = uc->uc_mcontext.gregs[9]; 91 sc->sc_regs[10] = uc->uc_mcontext.gregs[10]; 92 sc->sc_regs[11] = uc->uc_mcontext.gregs[11]; 93 sc->sc_regs[12] = uc->uc_mcontext.gregs[12]; 94 sc->sc_regs[13] = uc->uc_mcontext.gregs[13]; 95 sc->sc_regs[14] = uc->uc_mcontext.gregs[14]; 96 sc->sc_regs[15] = uc->uc_mcontext.gregs[15]; 97 sc->sc_pc = uc->uc_mcontext.pc; 98 sc->sc_pr = uc->uc_mcontext.pr; 99 100 /* Set the SP and the PC in order to continue execution at the modified 101 trampoline which restores the signal mask and the registers. */ 102 asm __volatile__ ( 103 "mov %0, r15\n" 104 "lds %1, pr\n" 105 "rts\n" 106 "nop\n" 107 : 108 : "r" (c->sigcontext_sp), 109 "r" (c->sigcontext_pc) 110 ); 111 } 112 unreachable(); 113 #endif 114 return -UNW_EINVAL; 115 } 116 117 #endif /* !UNW_REMOTE_ONLY */ 118 119 static inline void 120 establish_machine_state (struct cursor *c) 121 { 122 unw_addr_space_t as = c->dwarf.as; 123 void *arg = c->dwarf.as_arg; 124 unw_fpreg_t fpval; 125 unw_word_t val; 126 int reg; 127 128 Debug (8, "copying out cursor state\n"); 129 130 for (reg = 0; reg <= UNW_REG_LAST; ++reg) 131 { 132 Debug (16, "copying %s %d\n", unw_regname (reg), reg); 133 if (unw_is_fpreg (reg)) 134 { 135 if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0) 136 as->acc.access_fpreg (as, reg, &fpval, 1, arg); 137 } 138 else 139 { 140 if (tdep_access_reg (c, reg, &val, 0) >= 0) 141 as->acc.access_reg (as, reg, &val, 1, arg); 142 } 143 } 144 } 145 146 PROTECTED int 147 unw_resume (unw_cursor_t *cursor) 148 { 149 struct cursor *c = (struct cursor *) cursor; 150 151 Debug (1, "(cursor=%p)\n", c); 152 153 if (!c->dwarf.ip) 154 { 155 /* This can happen easily when the frame-chain gets truncated 156 due to bad or missing unwind-info. */ 157 Debug (1, "refusing to resume execution at address 0\n"); 158 return -UNW_EINVAL; 159 } 160 161 establish_machine_state (c); 162 163 return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c, 164 c->dwarf.as_arg); 165 } 166
