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Rename: src/dwarf/Gpe-dwarf.c -> src/dwarf/Gpe.c
}(Logical change 1.241)
This commit is contained in:
homeip.net!davidm
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/* libunwind - a platform-independent unwind library
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Copyright (c) 2003 Hewlett-Packard Development Company, L.P.
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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 "dwarf_i.h"
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#include "tdep.h"
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HIDDEN int
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dwarf_read_encoded_pointer (unw_addr_space_t as, unw_accessors_t *a,
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unw_word_t *addr, unsigned char encoding,
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unw_proc_info_t *pi,
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unw_word_t *valp, void *arg)
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{
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unw_word_t val, initial_addr = *addr;
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uint16_t uval16;
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uint32_t uval32;
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uint64_t uval64;
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int16_t sval16;
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int32_t sval32;
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int64_t sval64;
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int ret;
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/* DW_EH_PE_omit and DW_EH_PE_aligned don't follow the normal
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format/application encoding. Handle them first. */
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if (encoding == DW_EH_PE_omit)
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{
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*valp = 0;
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return 0;
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}
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else if (encoding == DW_EH_PE_aligned)
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{
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*addr = (initial_addr + sizeof (unw_word_t) - 1) & -sizeof (unw_word_t);
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return dwarf_readw (as, a, addr, valp, arg);
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}
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switch (encoding & DW_EH_PE_FORMAT_MASK)
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{
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case DW_EH_PE_ptr:
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if ((ret = dwarf_readw (as, a, addr, &val, arg)) < 0)
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return ret;
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break;
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case DW_EH_PE_uleb128:
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if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
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return ret;
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break;
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case DW_EH_PE_udata2:
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if ((ret = dwarf_readu16 (as, a, addr, &uval16, arg)) < 0)
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return ret;
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val = uval16;
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break;
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case DW_EH_PE_udata4:
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if ((ret = dwarf_readu32 (as, a, addr, &uval32, arg)) < 0)
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return ret;
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val = uval32;
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break;
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case DW_EH_PE_udata8:
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if ((ret = dwarf_readu64 (as, a, addr, &uval64, arg)) < 0)
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return ret;
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val = uval64;
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break;
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case DW_EH_PE_sleb128:
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if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
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return ret;
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break;
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case DW_EH_PE_sdata2:
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if ((ret = dwarf_reads16 (as, a, addr, &sval16, arg)) < 0)
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return ret;
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val = sval16;
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break;
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case DW_EH_PE_sdata4:
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if ((ret = dwarf_reads32 (as, a, addr, &sval32, arg)) < 0)
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return ret;
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val = sval32;
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break;
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case DW_EH_PE_sdata8:
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if ((ret = dwarf_reads64 (as, a, addr, &sval64, arg)) < 0)
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return ret;
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val = sval64;
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break;
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default:
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Debug (1, "unexpected encoding format 0x%x\n",
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encoding & DW_EH_PE_FORMAT_MASK);
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return -UNW_EINVAL;
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}
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if (val == 0)
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{
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/* 0 is a special value and always absolute. */
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*valp = 0;
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return 0;
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}
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switch (encoding & DW_EH_PE_APPL_MASK)
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{
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case DW_EH_PE_absptr:
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break;
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case DW_EH_PE_pcrel:
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val += initial_addr;
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break;
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case DW_EH_PE_datarel:
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/* XXX For now, assume that data-relative addresses are relative
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to the global pointer. */
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val += pi->gp;
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break;
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case DW_EH_PE_funcrel:
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val += pi->start_ip;
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break;
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case DW_EH_PE_textrel:
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/* XXX For now we don't support text-rel values. If there is a
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platform which needs this, we probably would have to add a
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"segbase" member to unw_proc_info_t. */
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default:
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Debug (1, "unexpected application type 0x%x\n",
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encoding & DW_EH_PE_APPL_MASK);
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return -UNW_EINVAL;
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}
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if (encoding & DW_EH_PE_indirect)
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{
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unw_word_t indirect_addr = val;
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if ((ret = dwarf_readw (as, a, &indirect_addr, &val, arg)) < 0)
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return ret;
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}
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*valp = val;
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return 0;
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}
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