1 /* libunwind - a platform-independent unwind library 2 Copyright (c) 2002-2004 Hewlett-Packard Development Company, L.P. 3 Contributed by David Mosberger-Tang <davidm (at) hpl.hp.com> 4 5 Modified for x86_64 by Max Asbock <masbock (at) us.ibm.com> 6 7 This file is part of libunwind. 8 9 Permission is hereby granted, free of charge, to any person obtaining 10 a copy of this software and associated documentation files (the 11 "Software"), to deal in the Software without restriction, including 12 without limitation the rights to use, copy, modify, merge, publish, 13 distribute, sublicense, and/or sell copies of the Software, and to 14 permit persons to whom the Software is furnished to do so, subject to 15 the following conditions: 16 17 The above copyright notice and this permission notice shall be 18 included in all copies or substantial portions of the Software. 19 20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 21 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 22 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 23 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 24 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 25 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 26 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 27 28 #include <stdlib.h> 29 30 #include "offsets.h" 31 #include "unwind_i.h" 32 33 #ifndef UNW_REMOTE_ONLY 34 35 HIDDEN inline int 36 x86_64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 37 { 38 struct cursor *c = (struct cursor *) cursor; 39 ucontext_t *uc = c->uc; 40 41 /* Ensure c->pi is up-to-date. On x86-64, it's relatively common to 42 be missing DWARF unwind info. We don't want to fail in that 43 case, because the frame-chain still would let us do a backtrace 44 at least. */ 45 dwarf_make_proc_info (&c->dwarf); 46 47 if (unlikely (c->sigcontext_format != X86_64_SCF_NONE)) 48 { 49 x86_64_sigreturn(cursor); 50 abort(); 51 } 52 else 53 { 54 Debug (8, "resuming at ip=%llx via setcontext()\n", 55 (unsigned long long) c->dwarf.ip); 56 setcontext (uc); 57 } 58 return -UNW_EINVAL; 59 } 60 61 #endif /* !UNW_REMOTE_ONLY */ 62 63 /* This routine is responsible for copying the register values in 64 cursor C and establishing them as the current machine state. */ 65 66 static inline int 67 establish_machine_state (struct cursor *c) 68 { 69 int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *, 70 int write, void *); 71 int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *, 72 int write, void *); 73 unw_addr_space_t as = c->dwarf.as; 74 void *arg = c->dwarf.as_arg; 75 unw_fpreg_t fpval; 76 unw_word_t val; 77 int reg; 78 79 access_reg = as->acc.access_reg; 80 access_fpreg = as->acc.access_fpreg; 81 82 Debug (8, "copying out cursor state\n"); 83 84 for (reg = 0; reg <= UNW_REG_LAST; ++reg) 85 { 86 Debug (16, "copying %s %d\n", unw_regname (reg), reg); 87 if (unw_is_fpreg (reg)) 88 { 89 if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0) 90 (*access_fpreg) (as, reg, &fpval, 1, arg); 91 } 92 else 93 { 94 if (tdep_access_reg (c, reg, &val, 0) >= 0) 95 (*access_reg) (as, reg, &val, 1, arg); 96 } 97 } 98 return 0; 99 } 100 101 PROTECTED int 102 unw_resume (unw_cursor_t *cursor) 103 { 104 struct cursor *c = (struct cursor *) cursor; 105 int ret; 106 107 Debug (1, "(cursor=%p)\n", c); 108 109 if ((ret = establish_machine_state (c)) < 0) 110 return ret; 111 112 return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c, 113 c->dwarf.as_arg); 114 } 115
