1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2003-2005 Hewlett-Packard Co 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#if UNW_TARGET_IA64 27 28#include "libunwind_i.h" 29#include "tdep-ia64/rse.h" 30 31static inline int 32bsp_match (unw_cursor_t *c, unw_word_t *wp) 33{ 34 unw_word_t bsp, pfs, sol; 35 36 if (unw_get_reg (c, UNW_IA64_BSP, &bsp) < 0 37 || unw_get_reg (c, UNW_IA64_AR_PFS, &pfs) < 0) 38 abort (); 39 40 /* simulate the effect of "br.call sigsetjmp" on ar.bsp: */ 41 sol = (pfs >> 7) & 0x7f; 42 bsp = rse_skip_regs (bsp, sol); 43 44 if (bsp != wp[JB_BSP]) 45 return 0; 46 47 if (unlikely (sol == 0)) 48 { 49 unw_word_t sp, prev_sp; 50 unw_cursor_t tmp = *c; 51 52 /* The caller of {sig,}setjmp() cannot have a NULL-frame. If we 53 see a NULL-frame, we haven't reached the right target yet. 54 To have a NULL-frame, the number of locals must be zero and 55 the stack-frame must also be empty. */ 56 57 if (unw_step (&tmp) < 0) 58 abort (); 59 60 if (unw_get_reg (&tmp, UNW_REG_SP, &sp) < 0 61 || unw_get_reg (&tmp, UNW_REG_SP, &prev_sp) < 0) 62 abort (); 63 64 if (sp == prev_sp) 65 /* got a NULL-frame; keep looking... */ 66 return 0; 67 } 68 return 1; 69} 70 71/* On ia64 we cannot always call sigprocmask() at 72 _UI_siglongjmp_cont() because the signal may have switched stacks 73 and the old stack's register-backing store may have overflown, 74 leaving us no space to allocate the stacked registers needed to 75 call sigprocmask(). Fortunately, we can just let unw_resume() (via 76 sigreturn) take care of restoring the signal-mask. That's faster 77 anyhow. */ 78static inline int 79resume_restores_sigmask (unw_cursor_t *c, unw_word_t *wp) 80{ 81 unw_word_t sc_addr = ((struct cursor *) c)->sigcontext_addr; 82 struct sigcontext *sc = (struct sigcontext *) sc_addr; 83 sigset_t current_mask; 84 void *mp; 85 86 if (!sc_addr) 87 return 0; 88 89 /* let unw_resume() install the desired signal mask */ 90 91 if (wp[JB_MASK_SAVED]) 92 mp = &wp[JB_MASK]; 93 else 94 { 95 if (sigprocmask (SIG_BLOCK, NULL, ¤t_mask) < 0) 96 abort (); 97 mp = ¤t_mask; 98 } 99 memcpy (&sc->sc_mask, mp, sizeof (sc->sc_mask)); 100 return 1; 101} 102 103#else /* !UNW_TARGET_IA64 */ 104 105static inline int 106bsp_match (unw_cursor_t *c, unw_word_t *wp) 107{ 108 return 1; 109} 110 111static inline int 112resume_restores_sigmask (unw_cursor_t *c, unw_word_t *wp) 113{ 114 /* We may want to do this analogously as for ia64... */ 115 return 0; 116} 117 118#endif /* !UNW_TARGET_IA64 */ 119