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3790561497
Use offsets defined in this file instead of calculating the offsets from sigcontext structure. (update_frame_state): Rename from ia64_get_frame_state() and make it static and inlined. (unw_step): Call update_frame_state() instead of ia64_get_frame_state(). (Logical change 1.5)
130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2001-2002 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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libunwind is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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libunwind is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public
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License. */
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#include "offsets.h"
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#include "rse.h"
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#include "unwind_i.h"
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static inline int
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update_frame_state (struct ia64_cursor *c)
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{
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unw_word_t prev_ip, prev_sp, prev_bsp, ip, pr, num_regs, cfm;
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int ret;
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prev_ip = c->ip;
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prev_sp = c->sp;
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prev_bsp = c->bsp;
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/* update the IP cache: */
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ret = ia64_get (c, c->ip_loc, &ip);
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if (ret < 0)
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return ret;
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c->ip = ip;
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if ((ip & 0xf) != 0)
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{
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/* don't let obviously bad addresses pollute the cache */
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debug (1, "%s: rejecting bad ip=0x%lx\n", __FUNCTION__, (long) c->ip);
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return -UNW_EINVALIDIP;
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}
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/* restore the cfm: */
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c->cfm_loc = c->pfs_loc;
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/* restore the bsp: */
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pr = c->pr;
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num_regs = 0;
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if ((c->pi.flags & IA64_FLAG_SIGTRAMP))
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{
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unw_word_t sigcontext_addr, sigcontext_flags;
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ret = ia64_get (c, c->sp + 0x10, &sigcontext_addr);
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if (ret < 0)
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return ret;
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ret = ia64_get (c, (sigcontext_addr + SIGCONTEXT_FLAGS_OFF),
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&sigcontext_flags);
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if (ret < 0)
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return ret;
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if ((sigcontext_flags & IA64_SC_FLAG_IN_SYSCALL_BIT) == 0)
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{
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unw_word_t cfm;
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ret = ia64_get (c, c->cfm_loc, &cfm);
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if (ret < 0)
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return ret;
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num_regs = cfm & 0x7f; /* size of frame */
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}
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c->pfs_loc = (c->sp + 0x10 + SIGCONTEXT_AR_PFS_OFF);
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}
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else
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{
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ret = ia64_get (c, c->cfm_loc, &cfm);
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if (ret < 0)
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return ret;
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num_regs = (cfm >> 7) & 0x7f; /* size of locals */
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}
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c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
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/* restore the sp: */
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c->sp = c->psp;
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if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)
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{
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dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
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__FUNCTION__, (long) ip);
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STAT(unw.stat.api.unwind_time += ia64_get_itc () - start);
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return -UNW_EBADFRAME;
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}
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/* as we unwind, the saved ar.unat becomes the primary unat: */
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c->pri_unat_loc = c->unat_loc;
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/* restore the predicates: */
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ret = ia64_get (c, c->pr_loc, &c->pr);
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if (ret < 0)
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return ret;
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return ia64_get_proc_info (c);
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}
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int
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unw_step (unw_cursor_t *cursor)
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{
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struct ia64_cursor *c = (struct ia64_cursor *) cursor;
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int ret;
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ret = ia64_find_save_locs (c);
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if (ret < 0)
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return ret;
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ret = update_frame_state (c);
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if (ret < 0)
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return ret;
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return (c->ip == 0) ? 0 : 1;
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}
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