1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2001-2004 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#include <stdlib.h> 27 28#include "unwind_i.h" 29#include "offsets.h" 30 31#ifndef UNW_REMOTE_ONLY 32 33static inline int 34local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 35{ 36#if defined(__linux) 37 unw_word_t dirty_partition[2048]; /* AR.RSC.LOADRS is a 14-bit field */ 38 unw_word_t val, sol, sof, pri_unat, n, pfs, bspstore, dirty_rnat; 39 struct cursor *c = (struct cursor *) cursor; 40 struct 41 { 42 unw_word_t r1; 43 unw_word_t r4; 44 unw_word_t r5; 45 unw_word_t r6; 46 unw_word_t r7; 47 unw_word_t r15; 48 unw_word_t r16; 49 unw_word_t r17; 50 unw_word_t r18; 51 } 52 extra; 53 int ret, dirty_size; 54# define GET_NAT(n) \ 55 do \ 56 { \ 57 ret = tdep_access_reg (c, UNW_IA64_NAT + (n), &val, 0); \ 58 if (ret < 0) \ 59 return ret; \ 60 if (val) \ 61 pri_unat |= (unw_word_t) 1 << n; \ 62 } \ 63 while (0) 64 65 /* ensure c->pi is up-to-date: */ 66 if ((ret = ia64_make_proc_info (c)) < 0) 67 return ret; 68 69 /* Copy contents of r4-r7 into "extra", so that their values end up 70 contiguous, so we can use a single (primary-) UNaT value. */ 71 if ((ret = ia64_get (c, c->loc[IA64_REG_R4], &extra.r4)) < 0 72 || (ret = ia64_get (c, c->loc[IA64_REG_R5], &extra.r5)) < 0 73 || (ret = ia64_get (c, c->loc[IA64_REG_R6], &extra.r6)) < 0 74 || (ret = ia64_get (c, c->loc[IA64_REG_R7], &extra.r7)) < 0) 75 return ret; 76 77 /* Form the primary UNaT value: */ 78 pri_unat = 0; 79 GET_NAT (4); GET_NAT(5); 80 GET_NAT (6); GET_NAT(7); 81 n = (((uintptr_t) &extra.r4) / 8 - 4) % 64; 82 pri_unat = (pri_unat << n) | (pri_unat >> (64 - n)); 83 84 if (unlikely (c->sigcontext_addr)) 85 { 86 struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr; 87# define PR_SCRATCH 0xffc0 /* p6-p15 are scratch */ 88# define PR_PRESERVED (~(PR_SCRATCH | 1)) 89 90 /* We're returning to a frame that was (either directly or 91 indirectly) interrupted by a signal. We have to restore 92 _both_ "preserved" and "scratch" registers. That doesn't 93 leave us any registers to work with, and the only way we can 94 achieve this is by doing a sigreturn(). 95 96 Note: it might be tempting to think that we don't have to 97 restore the scratch registers when returning to a frame that 98 was indirectly interrupted by a signal. However, that is not 99 safe because that frame and its descendants could have been 100 using a special convention that stores "preserved" state in 101 scratch registers. For example, the Linux fsyscall 102 convention does this with r11 (to save ar.pfs) and b6 (to 103 save "rp"). */ 104 105 sc->sc_gr[12] = c->psp; 106 c->psp = c->sigcontext_addr - c->sigcontext_off; 107 108 sof = (c->cfm & 0x7f); 109 if ((dirty_size = rbs_cover_and_flush (c, sof, dirty_partition, 110 &dirty_rnat, &bspstore)) < 0) 111 return dirty_size; 112 113 /* Clear the "in-syscall" flag, because in general we won't be 114 returning to the interruption-point and we need all registers 115 restored. */ 116 sc->sc_flags &= ~IA64_SC_FLAG_IN_SYSCALL; 117 sc->sc_ip = c->ip; 118 sc->sc_cfm = c->cfm & (((unw_word_t) 1 << 38) - 1); 119 sc->sc_pr = (c->pr & ~PR_SCRATCH) | (sc->sc_pr & ~PR_PRESERVED); 120 if ((ret = ia64_get (c, c->loc[IA64_REG_PFS], &sc->sc_ar_pfs)) < 0 121 || (ret = ia64_get (c, c->loc[IA64_REG_FPSR], &sc->sc_ar_fpsr)) < 0 122 || (ret = ia64_get (c, c->loc[IA64_REG_UNAT], &sc->sc_ar_unat)) < 0) 123 return ret; 124 125 sc->sc_gr[1] = c->pi.gp; 126 if (c->eh_valid_mask & 0x1) sc->sc_gr[15] = c->eh_args[0]; 127 if (c->eh_valid_mask & 0x2) sc->sc_gr[16] = c->eh_args[1]; 128 if (c->eh_valid_mask & 0x4) sc->sc_gr[17] = c->eh_args[2]; 129 if (c->eh_valid_mask & 0x8) sc->sc_gr[18] = c->eh_args[3]; 130 Debug (9, "sc: r15=%lx,r16=%lx,r17=%lx,r18=%lx\n", 131 (long) sc->sc_gr[15], (long) sc->sc_gr[16], 132 (long) sc->sc_gr[17], (long) sc->sc_gr[18]); 133 } 134 else 135 { 136 /* Account for the fact that _Uia64_install_context() will 137 return via br.ret, which will decrement bsp by size-of-locals. */ 138 if ((ret = ia64_get (c, c->loc[IA64_REG_PFS], &pfs)) < 0) 139 return ret; 140 sol = (pfs >> 7) & 0x7f; 141 if ((dirty_size = rbs_cover_and_flush (c, sol, dirty_partition, 142 &dirty_rnat, &bspstore)) < 0) 143 return dirty_size; 144 145 extra.r1 = c->pi.gp; 146 extra.r15 = c->eh_args[0]; 147 extra.r16 = c->eh_args[1]; 148 extra.r17 = c->eh_args[2]; 149 extra.r18 = c->eh_args[3]; 150 Debug (9, "extra: r15=%lx,r16=%lx,r17=%lx,r18=%lx\n", 151 (long) extra.r15, (long) extra.r16, 152 (long) extra.r17, (long) extra.r18); 153 } 154 Debug (8, "resuming at ip=%lx\n", (long) c->ip); 155 ia64_install_cursor (c, pri_unat, (unw_word_t *) &extra, 156 bspstore, dirty_size, dirty_partition + dirty_size/8, 157 dirty_rnat); 158#elif defined(__hpux) 159 struct cursor *c = (struct cursor *) cursor; 160 161 setcontext (c->as_arg); /* should not return */ 162#endif 163 return -UNW_EINVAL; 164} 165 166HIDDEN int 167ia64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg) 168{ 169 return local_resume (as, cursor, arg); 170} 171 172#endif /* !UNW_REMOTE_ONLY */ 173 174#ifndef UNW_LOCAL_ONLY 175 176static inline int 177remote_install_cursor (struct cursor *c) 178{ 179 int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *, 180 int write, void *); 181 int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *, 182 int write, void *); 183 unw_fpreg_t fpval; 184 unw_word_t val; 185 int reg; 186 187#if defined(__linux) && !defined(UNW_REMOTE_ONLY) 188 if (c->as == unw_local_addr_space) 189 { 190 /* Take a short-cut: we directly resume out of the cursor and 191 all we need to do is make sure that all locations point to 192 memory, not registers. Furthermore, R4-R7 and NAT4-NAT7 are 193 taken care of by ia64_local_resume() so they don't need to be 194 handled here. */ 195# define MEMIFY(preg, reg) \ 196 do { \ 197 if (IA64_IS_REG_LOC (c->loc[(preg)])) \ 198 c->loc[(preg)] = IA64_LOC_ADDR ((unw_word_t) \ 199 tdep_uc_addr(c->as_arg, (reg), \ 200 NULL), 0); \ 201 } while (0) 202 MEMIFY (IA64_REG_PR, UNW_IA64_PR); 203 MEMIFY (IA64_REG_PFS, UNW_IA64_AR_PFS); 204 MEMIFY (IA64_REG_RNAT, UNW_IA64_AR_RNAT); 205 MEMIFY (IA64_REG_UNAT, UNW_IA64_AR_UNAT); 206 MEMIFY (IA64_REG_LC, UNW_IA64_AR_LC); 207 MEMIFY (IA64_REG_FPSR, UNW_IA64_AR_FPSR); 208 MEMIFY (IA64_REG_IP, UNW_IA64_BR + 0); 209 MEMIFY (IA64_REG_B1, UNW_IA64_BR + 1); 210 MEMIFY (IA64_REG_B2, UNW_IA64_BR + 2); 211 MEMIFY (IA64_REG_B3, UNW_IA64_BR + 3); 212 MEMIFY (IA64_REG_B4, UNW_IA64_BR + 4); 213 MEMIFY (IA64_REG_B5, UNW_IA64_BR + 5); 214 MEMIFY (IA64_REG_F2, UNW_IA64_FR + 2); 215 MEMIFY (IA64_REG_F3, UNW_IA64_FR + 3); 216 MEMIFY (IA64_REG_F4, UNW_IA64_FR + 4); 217 MEMIFY (IA64_REG_F5, UNW_IA64_FR + 5); 218 MEMIFY (IA64_REG_F16, UNW_IA64_FR + 16); 219 MEMIFY (IA64_REG_F17, UNW_IA64_FR + 17); 220 MEMIFY (IA64_REG_F18, UNW_IA64_FR + 18); 221 MEMIFY (IA64_REG_F19, UNW_IA64_FR + 19); 222 MEMIFY (IA64_REG_F20, UNW_IA64_FR + 20); 223 MEMIFY (IA64_REG_F21, UNW_IA64_FR + 21); 224 MEMIFY (IA64_REG_F22, UNW_IA64_FR + 22); 225 MEMIFY (IA64_REG_F23, UNW_IA64_FR + 23); 226 MEMIFY (IA64_REG_F24, UNW_IA64_FR + 24); 227 MEMIFY (IA64_REG_F25, UNW_IA64_FR + 25); 228 MEMIFY (IA64_REG_F26, UNW_IA64_FR + 26); 229 MEMIFY (IA64_REG_F27, UNW_IA64_FR + 27); 230 MEMIFY (IA64_REG_F28, UNW_IA64_FR + 28); 231 MEMIFY (IA64_REG_F29, UNW_IA64_FR + 29); 232 MEMIFY (IA64_REG_F30, UNW_IA64_FR + 30); 233 MEMIFY (IA64_REG_F31, UNW_IA64_FR + 31); 234 } 235 else 236#endif /* __linux && !UNW_REMOTE_ONLY */ 237 { 238 access_reg = c->as->acc.access_reg; 239 access_fpreg = c->as->acc.access_fpreg; 240 241 Debug (8, "copying out cursor state\n"); 242 243 for (reg = 0; reg <= UNW_REG_LAST; ++reg) 244 { 245 if (unw_is_fpreg (reg)) 246 { 247 if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0) 248 (*access_fpreg) (c->as, reg, &fpval, 1, c->as_arg); 249 } 250 else 251 { 252 if (tdep_access_reg (c, reg, &val, 0) >= 0) 253 (*access_reg) (c->as, reg, &val, 1, c->as_arg); 254 } 255 } 256 } 257 return (*c->as->acc.resume) (c->as, (unw_cursor_t *) c, c->as_arg); 258} 259 260#endif /* !UNW_LOCAL_ONLY */ 261 262PROTECTED int 263unw_resume (unw_cursor_t *cursor) 264{ 265 struct cursor *c = (struct cursor *) cursor; 266 267 Debug (1, "(cursor=%p, ip=0x%016lx)\n", c, (unsigned long) c->ip); 268 269#ifdef UNW_LOCAL_ONLY 270 return local_resume (c->as, cursor, c->as_arg); 271#else 272 return remote_install_cursor (c); 273#endif 274} 275