Rename: src/dwarf/Gpe-dwarf.c -> src/dwarf/Gpe.c

(Logical change 1.241)

src/dwarf/Gpe.c

@@ -0,0 +1,162 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (c) 2003 Hewlett-Packard Development Company, L.P.
+	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "dwarf_i.h"
+#include "tdep.h"
+
+HIDDEN int
+dwarf_read_encoded_pointer (unw_addr_space_t as, unw_accessors_t *a,
+			    unw_word_t *addr, unsigned char encoding,
+			    unw_proc_info_t *pi,
+			    unw_word_t *valp, void *arg)
+{
+  unw_word_t val, initial_addr = *addr;
+  uint16_t uval16;
+  uint32_t uval32;
+  uint64_t uval64;
+  int16_t sval16;
+  int32_t sval32;
+  int64_t sval64;
+  int ret;
+
+  /* DW_EH_PE_omit and DW_EH_PE_aligned don't follow the normal
+     format/application encoding.  Handle them first.  */
+  if (encoding == DW_EH_PE_omit)
+    {
+      *valp = 0;
+      return 0;
+    }
+  else if (encoding == DW_EH_PE_aligned)
+    {
+      *addr = (initial_addr + sizeof (unw_word_t) - 1) & -sizeof (unw_word_t);
+      return dwarf_readw (as, a, addr, valp, arg);
+    }
+
+  switch (encoding & DW_EH_PE_FORMAT_MASK)
+    {
+    case DW_EH_PE_ptr:
+      if ((ret = dwarf_readw (as, a, addr, &val, arg)) < 0)
+	return ret;
+      break;
+
+    case DW_EH_PE_uleb128:
+      if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
+	return ret;
+      break;
+
+    case DW_EH_PE_udata2:
+      if ((ret = dwarf_readu16 (as, a, addr, &uval16, arg)) < 0)
+	return ret;
+      val = uval16;
+      break;
+
+    case DW_EH_PE_udata4:
+      if ((ret = dwarf_readu32 (as, a, addr, &uval32, arg)) < 0)
+	return ret;
+      val = uval32;
+      break;
+
+    case DW_EH_PE_udata8:
+      if ((ret = dwarf_readu64 (as, a, addr, &uval64, arg)) < 0)
+	return ret;
+      val = uval64;
+      break;
+
+    case DW_EH_PE_sleb128:
+      if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
+	return ret;
+      break;
+
+    case DW_EH_PE_sdata2:
+      if ((ret = dwarf_reads16 (as, a, addr, &sval16, arg)) < 0)
+	return ret;
+      val = sval16;
+      break;
+
+    case DW_EH_PE_sdata4:
+      if ((ret = dwarf_reads32 (as, a, addr, &sval32, arg)) < 0)
+	return ret;
+      val = sval32;
+      break;
+
+    case DW_EH_PE_sdata8:
+      if ((ret = dwarf_reads64 (as, a, addr, &sval64, arg)) < 0)
+	return ret;
+      val = sval64;
+      break;
+
+    default:
+      Debug (1, "unexpected encoding format 0x%x\n",
+	     encoding & DW_EH_PE_FORMAT_MASK);
+      return -UNW_EINVAL;
+    }
+
+  if (val == 0)
+    {
+      /* 0 is a special value and always absolute.  */
+      *valp = 0;
+      return 0;
+    }
+
+  switch (encoding & DW_EH_PE_APPL_MASK)
+    {
+    case DW_EH_PE_absptr:
+      break;
+
+    case DW_EH_PE_pcrel:
+      val += initial_addr;
+      break;
+
+    case DW_EH_PE_datarel:
+      /* XXX For now, assume that data-relative addresses are relative
+         to the global pointer.  */
+      val += pi->gp;
+      break;
+
+    case DW_EH_PE_funcrel:
+      val += pi->start_ip;
+      break;
+
+    case DW_EH_PE_textrel:
+      /* XXX For now we don't support text-rel values.  If there is a
+         platform which needs this, we probably would have to add a
+         "segbase" member to unw_proc_info_t.  */
+    default:
+      Debug (1, "unexpected application type 0x%x\n",
+	     encoding & DW_EH_PE_APPL_MASK);
+      return -UNW_EINVAL;
+    }
+
+  if (encoding & DW_EH_PE_indirect)
+    {
+      unw_word_t indirect_addr = val;
+
+      if ((ret = dwarf_readw (as, a, &indirect_addr, &val, arg)) < 0)
+	return ret;
+    }
+
+  *valp = val;
+  return 0;
+}