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https://github.com/tobast/libunwind-eh_elf.git
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141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2003-2004 Hewlett-Packard Co
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Contributed by David Mosberger
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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 "unwind_i.h"
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static inline int
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update_frame_state (struct cursor *c)
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{
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#if 0
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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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c->cfm_loc = c->pfs_loc;
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num_regs = 0;
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if (c->is_signal_frame)
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{
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ret = ia64_get (c, c->sp + 0x10 + SIGFRAME_ARG2_OFF, &c->sigcontext_loc);
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Debug (12, "sigcontext_loc=%lx (ret=%d)\n", c->sigcontext_loc, ret);
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if (ret < 0)
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return ret;
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if (c->ip_loc == c->sigcontext_loc + SIGCONTEXT_BR_OFF + 0*8)
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{
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/* Earlier kernels (before 2.4.19 and 2.5.10) had buggy
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unwind info for sigtramp. Fix it up here. */
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c->ip_loc = (c->sigcontext_loc + SIGCONTEXT_IP_OFF);
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c->cfm_loc = (c->sigcontext_loc + SIGCONTEXT_CFM_OFF);
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}
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/* do what can't be described by unwind directives: */
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c->pfs_loc = (c->sigcontext_loc + SIGCONTEXT_AR_PFS_OFF);
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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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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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/* 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 & 0xc) != 0)
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{
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/* don't let obviously bad addresses pollute the cache */
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Debug (1, "rejecting bad ip=0x%lx\n", (long) c->ip);
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return -UNW_EINVALIDIP;
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}
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if (ip == 0)
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/* end of frame-chain reached */
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return 0;
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pr = c->pr;
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c->sp = c->psp;
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c->is_signal_frame = 0;
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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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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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c->pi_valid = 0;
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#endif
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return 0;
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}
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PROTECTED int
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unw_step (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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ret = hppa_get (c, c->sp_loc, &c->sp);
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if (ret < 0)
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return ret;
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c->sp_loc = HPPA_LOC (c->sp, 0);
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c->ip_loc = HPPA_LOC (c->sp + 4, 0);
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c->sp += 8;
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if (HPPA_GET_LOC (c->sp_loc))
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{
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ret = hppa_get (c, c->ip_loc, &c->ip);
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if (ret < 0)
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return ret;
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}
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else
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c->ip = 0;
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return (c->ip == 0) ? 0 : 1;
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}
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