1/* libunwind - a platform-independent unwind library 2 Copyright (c) 2004 Hewlett-Packard Development Company, L.P. 3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com> 4 5This file is part of libunwind. 6 7Permission is hereby granted, free of charge, to any person obtaining 8a copy of this software and associated documentation files (the 9"Software"), to deal in the Software without restriction, including 10without limitation the rights to use, copy, modify, merge, publish, 11distribute, sublicense, and/or sell copies of the Software, and to 12permit persons to whom the Software is furnished to do so, subject to 13the following conditions: 14 15The above copyright notice and this permission notice shall be 16included in all copies or substantial portions of the Software. 17 18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26#include <stdlib.h> 27 28#include "unwind_i.h" 29 30#ifndef UNW_REMOTE_ONLY 31 32#if defined(__linux) 33 34# include <sys/syscall.h> 35 36static NORETURN inline long 37my_rt_sigreturn (void *new_sp, int in_syscall) 38{ 39 register unsigned long r25 __asm__ ("r25") = (in_syscall != 0); 40 register unsigned long r20 __asm__ ("r20") = SYS_rt_sigreturn; 41 42 __asm__ __volatile__ ("copy %0, %%sp\n" 43 "be,l 0x100(%%sr2,%%r0),%%sr0,%%r31\n" 44 "nop" 45 : 46 : "r"(new_sp), "r"(r20), "r"(r25) 47 : "memory"); 48 abort (); 49} 50 51#endif /* __linux */ 52 53HIDDEN inline int 54hppa_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 55{ 56#if defined(__linux) 57 struct cursor *c = (struct cursor *) cursor; 58 ucontext_t *uc = c->dwarf.as_arg; 59 60 /* Ensure c->pi is up-to-date. On PA-RISC, it's relatively common to be 61 missing DWARF unwind info. We don't want to fail in that case, 62 because the frame-chain still would let us do a backtrace at 63 least. */ 64 dwarf_make_proc_info (&c->dwarf); 65 66 if (unlikely (c->sigcontext_format != HPPA_SCF_NONE)) 67 { 68 struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr; 69 70 Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc); 71 my_rt_sigreturn (sc, (sc->sc_flags & PARISC_SC_FLAG_IN_SYSCALL) != 0); 72 } 73 else 74 { 75 Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip); 76 setcontext (uc); 77 } 78#else 79# warning Implement me! 80#endif 81 return -UNW_EINVAL; 82} 83 84#endif /* !UNW_REMOTE_ONLY */ 85 86/* This routine is responsible for copying the register values in 87 cursor C and establishing them as the current machine state. */ 88 89static inline int 90establish_machine_state (struct cursor *c) 91{ 92 int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *, 93 int write, void *); 94 int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *, 95 int write, void *); 96 unw_addr_space_t as = c->dwarf.as; 97 void *arg = c->dwarf.as_arg; 98 unw_fpreg_t fpval; 99 unw_word_t val; 100 int reg; 101 102 access_reg = as->acc.access_reg; 103 access_fpreg = as->acc.access_fpreg; 104 105 Debug (8, "copying out cursor state\n"); 106 107 for (reg = 0; reg <= UNW_REG_LAST; ++reg) 108 { 109 Debug (16, "copying %s %d\n", unw_regname (reg), reg); 110 if (unw_is_fpreg (reg)) 111 { 112 if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0) 113 (*access_fpreg) (as, reg, &fpval, 1, arg); 114 } 115 else 116 { 117 if (tdep_access_reg (c, reg, &val, 0) >= 0) 118 (*access_reg) (as, reg, &val, 1, arg); 119 } 120 } 121 return 0; 122} 123 124PROTECTED int 125unw_resume (unw_cursor_t *cursor) 126{ 127 struct cursor *c = (struct cursor *) cursor; 128 int ret; 129 130 Debug (1, "(cursor=%p)\n", c); 131 132 if (!c->dwarf.ip) 133 { 134 /* This can happen easily when the frame-chain gets truncated 135 due to bad or missing unwind-info. */ 136 Debug (1, "refusing to resume execution at address 0\n"); 137 return -UNW_EINVAL; 138 } 139 140 if ((ret = establish_machine_state (c)) < 0) 141 return ret; 142 143 return (*c->dwarf.as->acc.resume) (c->dwarf.as, (unw_cursor_t *) c, 144 c->dwarf.as_arg); 145} 146