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(_Uia64_find_dyn_list): New ia64-specific helper routine to locate the dynamic-info

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list address in an unwind-table.

(Logical change 1.31)
This commit is contained in:
mostang.com!davidm 2002-12-18 05:18:40 +00:00
parent 1c8ee38936
commit 4bbf588c89
1 changed files with 54 additions and 0 deletions
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54
src/ia64/tables.c
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@ -150,6 +150,60 @@ tdep_put_unwind_info (unw_addr_space_t as, unw_proc_info_t *pi, void *arg)
}
}
unw_word_t
_Uia64_find_dyn_list (unw_addr_space_t as, void *table, size_t table_size,
unw_word_t segbase, void *arg)
{
unw_word_t hdr_addr, info_addr, hdr, directives, pers, cookie, off;
unw_accessors_t *a = unw_get_accessors (as);
struct ia64_table_entry *tab = table;
int ret;
if (table_size < sizeof (struct ia64_table_entry))
return 0;
if (tab[0].start_offset != tab[0].end_offset)
/* dyn-list entry cover a zero-length "procedure" and should be
first entry (note: technically a binary could contain code
below the segment base, but this doesn't happen for normal
binaries and certainly doesn't happen when libunwind is a
separate shared object. For weird cases, the application may
have to provide its own (slower) version of this routine. */
return 0;
hdr_addr = tab[0].info_offset + segbase;
info_addr = hdr_addr + 8;
/* read the header word: */
ret = (*a->access_mem) (as, hdr_addr, &hdr, 0, arg);
if (ret < 0)
return ret;
if (IA64_UNW_VER (hdr) != 1
|| IA64_UNW_FLAG_EHANDLER (hdr) || IA64_UNW_FLAG_UHANDLER (hdr))
/* dyn-list entry must be version 1 and doesn't have ehandler
or uhandler */
return 0;
if (IA64_UNW_LENGTH (hdr) != 1)
/* dyn-list entry must consist of a single word of NOP directives */
return 0;
if (((ret = (*a->access_mem) (as, info_addr, &directives, 0, arg)) < 0)
|| ((ret = (*a->access_mem) (as, info_addr + 0x08, &pers, 0, arg)) < 0)
|| ((ret = (*a->access_mem) (as, info_addr + 0x10, &cookie, 0, arg)) < 0)
|| ((ret = (*a->access_mem) (as, info_addr + 0x10, &off, 0, arg)) < 0))
return 0;
if (directives != 0 || pers != 0
|| (!as->big_endian && cookie != 0x7473696c2d6e7964)
|| ( as->big_endian && cookie != 0x64796e2d6c697374))
return 0;
/* OK, we ran the gauntlet and found it: */
return off + segbase;
}
#ifndef UNW_REMOTE_ONLY
#include <link.h>