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Rename: src/ia64/Gresume-ia64.c -> src/ia64/Gresume.c
(Logical change 1.241)
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1 changed files with 267 additions and 0 deletions
267
src/ia64/Gresume.c
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267
src/ia64/Gresume.c
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <stdlib.h>
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#include "unwind_i.h"
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#include "offsets.h"
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#ifndef UNW_REMOTE_ONLY
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static inline int
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local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
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{
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#if defined(__linux)
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unw_word_t val, sol, sof, pri_unat, n, pfs;
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struct cursor *c = (struct cursor *) cursor;
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struct
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{
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unw_word_t r1;
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unw_word_t r4;
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unw_word_t r5;
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unw_word_t r6;
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unw_word_t r7;
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unw_word_t r15;
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unw_word_t r16;
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unw_word_t r17;
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unw_word_t r18;
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}
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extra;
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int ret;
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# define GET_NAT(n) \
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do \
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{ \
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ret = tdep_access_reg (c, UNW_IA64_NAT + (n), &val, 0); \
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if (ret < 0) \
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return ret; \
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if (val) \
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pri_unat |= (unw_word_t) 1 << n; \
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} \
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while (0)
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/* ensure c->pi is up-to-date: */
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if ((ret = ia64_make_proc_info (c)) < 0)
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return ret;
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/* Copy contents of r4-r7 into "extra", so that their values end up
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contiguous, so we can use a single (primary-) UNaT value. */
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if ((ret = ia64_get (c, c->loc[IA64_REG_R4], &extra.r4)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_R5], &extra.r5)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_R6], &extra.r6)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_R7], &extra.r7)) < 0)
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return ret;
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/* Form the primary UNaT value: */
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pri_unat = 0;
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GET_NAT (4); GET_NAT(5);
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GET_NAT (6); GET_NAT(7);
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n = (((uintptr_t) &extra.r4) / 8 - 4) % 64;
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pri_unat = (pri_unat << n) | (pri_unat >> (64 - n));
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if (unlikely (c->sigcontext_addr))
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{
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struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
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# define PR_SCRATCH 0xffc0 /* p6-p15 are scratch */
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# define PR_PRESERVED (~(PR_SCRATCH | 1))
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/* We're returning to a frame that was (either directly or
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indirectly) interrupted by a signal. We have to restore
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_both_ "preserved" and "scratch" registers. That doesn't
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leave us any registers to work with, and the only way we can
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achieve this is by doing a sigreturn().
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Note: it might be tempting to think that we don't have to
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restore the scratch registers when returning to a frame that
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was indirectly interrupted by a signal. However, that is not
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safe because that frame and its descendants could have been
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using a special convention that stores "preserved" state in
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scratch registers. For example, the Linux fsyscall
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convention does this with r11 (to save ar.pfs) and b6 (to
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save "rp"). */
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sc->sc_gr[12] = c->psp;
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c->psp = c->sigcontext_addr - c->sigcontext_off;
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sof = (c->cfm & 0x7f);
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rbs_cover_and_flush (c, sof);
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/* Clear the "in-syscall" flag, because in general we won't be
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returning to the interruption-point and we need all registers
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restored. */
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sc->sc_flags &= ~IA64_SC_FLAG_IN_SYSCALL;
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sc->sc_ip = c->ip;
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sc->sc_cfm = c->cfm & (((unw_word_t) 1 << 38) - 1);
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sc->sc_pr = (c->pr & ~PR_SCRATCH) | (sc->sc_pr & ~PR_PRESERVED);
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if ((ret = ia64_get (c, c->loc[IA64_REG_PFS], &sc->sc_ar_pfs)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_FPSR], &sc->sc_ar_fpsr)) < 0
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|| (ret = ia64_get (c, c->loc[IA64_REG_UNAT], &sc->sc_ar_unat)) < 0)
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return ret;
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sc->sc_gr[1] = c->pi.gp;
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if (c->eh_valid_mask & 0x1) sc->sc_gr[15] = c->eh_args[0];
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if (c->eh_valid_mask & 0x2) sc->sc_gr[16] = c->eh_args[1];
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if (c->eh_valid_mask & 0x4) sc->sc_gr[17] = c->eh_args[2];
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if (c->eh_valid_mask & 0x8) sc->sc_gr[18] = c->eh_args[3];
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Debug (9, "sc: r15=%lx,r16=%lx,r17=%lx,r18=%lx\n",
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(long) sc->sc_gr[15], (long) sc->sc_gr[16],
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(long) sc->sc_gr[17], (long) sc->sc_gr[18]);
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}
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else
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{
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/* Account for the fact that _Uia64_install_context() will
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return via br.ret, which will decrement bsp by size-of-locals. */
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if ((ret = ia64_get (c, c->loc[IA64_REG_PFS], &pfs)) < 0)
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return ret;
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sol = (pfs >> 7) & 0x7f;
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rbs_cover_and_flush (c, sol);
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extra.r1 = c->pi.gp;
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extra.r15 = c->eh_args[0];
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extra.r16 = c->eh_args[1];
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extra.r17 = c->eh_args[2];
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extra.r18 = c->eh_args[3];
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Debug (9, "extra: r15=%lx,r16=%lx,r17=%lx,r18=%lx\n",
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(long) extra.r15, (long) extra.r16,
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(long) extra.r17, (long) extra.r18);
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}
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Debug (8, "resuming at ip=%lx\n", (long) c->ip);
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ia64_install_cursor (c, pri_unat, (unw_word_t *) &extra);
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#elif defined(__hpux)
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struct cursor *c = (struct cursor *) cursor;
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setcontext (c->as_arg); /* should not return */
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#endif
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return -UNW_EINVAL;
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}
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HIDDEN int
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ia64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
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{
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return local_resume (as, cursor, arg);
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}
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#endif /* !UNW_REMOTE_ONLY */
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#ifndef UNW_LOCAL_ONLY
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static inline int
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remote_install_cursor (struct cursor *c)
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{
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int (*access_reg) (unw_addr_space_t, unw_regnum_t, unw_word_t *,
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int write, void *);
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int (*access_fpreg) (unw_addr_space_t, unw_regnum_t, unw_fpreg_t *,
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int write, void *);
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unw_fpreg_t fpval;
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unw_word_t val;
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int reg;
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#if defined(__linux) && !defined(UNW_REMOTE_ONLY)
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if (c->as == unw_local_addr_space)
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{
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/* Take a short-cut: we directly resume out of the cursor and
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all we need to do is make sure that all locations point to
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memory, not registers. Furthermore, R4-R7 and NAT4-NAT7 are
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taken care of by ia64_local_resume() so they don't need to be
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handled here. */
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# define MEMIFY(preg, reg) \
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do { \
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if (IA64_IS_REG_LOC (c->loc[(preg)])) \
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c->loc[(preg)] = IA64_LOC_ADDR ((unw_word_t) \
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tdep_uc_addr(c->as_arg, (reg), \
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NULL), 0); \
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} while (0)
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MEMIFY (IA64_REG_PR, UNW_IA64_PR);
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MEMIFY (IA64_REG_PFS, UNW_IA64_AR_PFS);
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MEMIFY (IA64_REG_RNAT, UNW_IA64_AR_RNAT);
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MEMIFY (IA64_REG_UNAT, UNW_IA64_AR_UNAT);
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MEMIFY (IA64_REG_LC, UNW_IA64_AR_LC);
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MEMIFY (IA64_REG_FPSR, UNW_IA64_AR_FPSR);
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MEMIFY (IA64_REG_IP, UNW_IA64_BR + 0);
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MEMIFY (IA64_REG_B1, UNW_IA64_BR + 1);
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MEMIFY (IA64_REG_B2, UNW_IA64_BR + 2);
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MEMIFY (IA64_REG_B3, UNW_IA64_BR + 3);
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MEMIFY (IA64_REG_B4, UNW_IA64_BR + 4);
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MEMIFY (IA64_REG_B5, UNW_IA64_BR + 5);
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MEMIFY (IA64_REG_F2, UNW_IA64_FR + 2);
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MEMIFY (IA64_REG_F3, UNW_IA64_FR + 3);
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MEMIFY (IA64_REG_F4, UNW_IA64_FR + 4);
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MEMIFY (IA64_REG_F5, UNW_IA64_FR + 5);
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MEMIFY (IA64_REG_F16, UNW_IA64_FR + 16);
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MEMIFY (IA64_REG_F17, UNW_IA64_FR + 17);
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MEMIFY (IA64_REG_F18, UNW_IA64_FR + 18);
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MEMIFY (IA64_REG_F19, UNW_IA64_FR + 19);
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MEMIFY (IA64_REG_F20, UNW_IA64_FR + 20);
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MEMIFY (IA64_REG_F21, UNW_IA64_FR + 21);
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MEMIFY (IA64_REG_F22, UNW_IA64_FR + 22);
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MEMIFY (IA64_REG_F23, UNW_IA64_FR + 23);
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MEMIFY (IA64_REG_F24, UNW_IA64_FR + 24);
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MEMIFY (IA64_REG_F25, UNW_IA64_FR + 25);
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MEMIFY (IA64_REG_F26, UNW_IA64_FR + 26);
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MEMIFY (IA64_REG_F27, UNW_IA64_FR + 27);
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MEMIFY (IA64_REG_F28, UNW_IA64_FR + 28);
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MEMIFY (IA64_REG_F29, UNW_IA64_FR + 29);
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MEMIFY (IA64_REG_F30, UNW_IA64_FR + 30);
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MEMIFY (IA64_REG_F31, UNW_IA64_FR + 31);
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}
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else
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#endif /* __linux && !UNW_REMOTE_ONLY */
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{
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access_reg = c->as->acc.access_reg;
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access_fpreg = c->as->acc.access_fpreg;
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Debug (8, "copying out cursor state\n");
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for (reg = 0; reg < UNW_REG_LAST; ++reg)
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{
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if (unw_is_fpreg (reg))
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{
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if (tdep_access_fpreg (c, reg, &fpval, 0) >= 0)
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(*access_fpreg) (c->as, reg, &fpval, 1, c->as_arg);
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}
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else
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{
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if (tdep_access_reg (c, reg, &val, 0) >= 0)
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(*access_reg) (c->as, reg, &val, 1, c->as_arg);
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}
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}
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}
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return (*c->as->acc.resume) (c->as, (unw_cursor_t *) c, c->as_arg);
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}
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#endif /* !UNW_LOCAL_ONLY */
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PROTECTED int
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unw_resume (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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Debug (2, "(cursor=%p)\n", c);
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#ifdef UNW_LOCAL_ONLY
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return local_resume (c->as, cursor, c->as_arg);
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#else
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return remote_install_cursor (c);
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#endif
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}
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