powerpc support

Signed-off-by: Peng Fan <van.freenix@gmail.com>

1 files changed, 119 insertions, 86 deletions

diff --git a/rtl-mdreloc-powerpc.c b/rtl-mdreloc-powerpc.c
index 719570e..4f009c9 100644
--- a/rtl-mdreloc-powerpc.c
+++ b/rtl-mdreloc-powerpc.c
@@ -4,34 +4,6 @@
 
 /*  $NetBSD: ppc_reloc.c,v 1.44 2010/01/13 20:17:22 christos Exp $  */
 
-/*-
- * Copyright (C) 1998  Tsubai Masanari
- * Portions copyright 2002 Charles M. Hannum <root@ihack.net>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
 #include <sys/cdefs.h>
 
 #include <errno.h>
@@ -48,105 +20,166 @@
                  ((u_int32_t)(x) + 0x10000) : (u_int32_t)(x)) >> 16)
 #define l(x) ((u_int32_t)(x) & 0xffff)
 
-/*
- * The PPC PLT format consists of three sections:
- * (1) The "pltcall" and "pltresolve" glue code.  This is always 18 words.
- * (2) The code part of the PLT entries.  There are 2 words per entry for
- *     up to 8192 entries, then 4 words per entry for any additional entries.
- * (3) The data part of the PLT entries, comprising a jump table.
- *     This section is half the size of the second section (ie. 1 or 2 words
- *     per entry).
- */
 
-/*
- * Setup the plt glue routines.
- */
-#define PLTCALL_SIZE    20
-#define PLTRESOLVE_SIZE 24
+bool
+rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
+{
+  return true;
+}
 
 bool
-rtems_rtl_elf_relocate_rela (rtems_rtl_obj_t*      obj,
-                             const Elf_Rela*       rela,
-                             rtems_rtl_obj_sect_t* sect,
-                             const Elf_Sym*        sym,
-                             const char*           symname)
+rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t*      obj,
+                             const Elf_Rela*             rela,
+                             const rtems_rtl_obj_sect_t* sect,
+                             const char*                 symname,
+                             const Elf_Byte              syminfo,
+                             const Elf_Word              symvalue)
 {
   Elf_Addr  target = 0;
   Elf_Addr* where;
-  Elf_Word  symvalue;
+  Elf_Word tmp;
+  uint32_t mask = 0;
+  uint32_t bits = 0;
 
   where = (Elf_Addr *)(sect->base + rela->r_offset);
-
   switch (ELF_R_TYPE(rela->r_info)) {
-    case R_TYPE(JMP_SLOT):
     case R_TYPE(NONE):
       break;
 
-    case R_TYPE(PC32):
-      if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
-        return false;
-
-      target = (Elf_Addr) symvalue + rela->r_addend;
-      *where += target - (Elf_Addr)where;
-
+    case R_TYPE(32):
+      /*
+       * value:1; Field: word32; Expression: S + A
+       */
+      *where = symvalue + rela->r_addend;
       if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
-        printf ("rtl: reloc PC32 %s in %s --> %p (%p) in %s\n",
-                symname, sect->name, (void*) (symvalue + rela->r_addend),
-                (void *)*where, obj->oname);
+        printf ("rtl: ADDR32 %p @ %p in %s\n",
+                (void *)*(where), where, rtems_rtl_obj_oname (obj));
       break;
 
-    case R_TYPE(32):  /* word32 S + A */
-    case R_TYPE(GLOB_DAT):  /* word32 S + A */
-      if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
+    case R_TYPE(14):
+      /*
+       * value:7; Field: low14*; Expression: (S + A) >> 2
+       */
+    case R_TYPE(24):
+      /*
+       * value:2; Field: low24*; Expression: (S + A) >> 2
+       */
+      if (ELF_R_TYPE(rela->r_info) == R_TYPE(14)) {
+        bits = 14;
+        mask = 0xfffc;
+      } else {
+        bits = 24;
+        mask = 0x3fffffc;
+      }
+      tmp = (symvalue + rela->r_addend) >> 2;
+      if (tmp > (1<<bits -1 )) {
+        printf("Overflow ADDR14/ADDR24\n");
         return false;
+      }
+      tmp = *where;
+      tmp &= ~mask;
+      tmp |= (symvalue + rela->r_addend) & mask;
+      *where = tmp;
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: ADDR14/ADDR24 %p @ %p in %s\n",
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
+      break;
 
-      target = (Elf_Addr) symvalue + rela->r_addend;
+    case R_TYPE(16_HA):
+      /*
+       * value:6; Field:half16; Expression: #ha(S+A)
+       */
 
-      if (*where != target)
-        *where = target;
+      tmp = symvalue + rela->r_addend;
+      *(uint16_t *)where = (((tmp >> 16) + ((tmp & 0x8000) ? 1: 0)) & 0xffff);
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: 16_HA %p @ %p in %s\n",
+                (void *)*(where), where, rtems_rtl_obj_oname (obj));
+      break;
 
+    case R_TYPE(16_HI):
+      /*
+       * value:5; Field:half16; Expression: #hi(S+A)
+       */
+      *(uint16_t *)where = ((symvalue + rela->r_addend) >> 16) & 0xffff;
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: 16_HI %p @ %p in %s\n",
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
+      break;
+    case R_TYPE(16_LO):
+      /*
+       * value:4; Field:half16; Expression: #lo(S+A)
+       */
+      *(uint16_t *)where = (symvalue + (rela->r_addend)) & 0xffff;
       if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
-        printf ("rtl: reloc 32/GLOB_DAT %s in %s --> %p in %s\n",
-                symname, sect->name, (void *)*where, obj->oname);
+        printf ("rtl: 16_LO %p @ %p in %s\n",
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
       break;
 
-    case R_TYPE(RELATIVE):  /* word32 B + A */
-      *where += (Elf_Addr) sect->base + rela->r_addend;
+    case R_TYPE(REL14):
+      /*
+       * value:11; Field:low14*; Expression:(S+A-P)>>2
+       */
+    case R_TYPE(REL24):
+      /*
+       * value:10; Field:low24*; Expression:(S+A-P)>>2
+       */
+      if (ELF_R_TYPE(rela->r_info) == R_TYPE(REL24)) {
+        mask = 0x3fffffc;
+        bits = 24;
+      }
+      else if (ELF_R_TYPE(rela->r_info) == R_TYPE(REL14)) {
+        mask = 0xfffc;
+        bits = 14;
+      }
+
+      tmp =((int) (symvalue + rela->r_addend - (Elf_Addr)where)) >> 2;
+      if (((Elf_Sword)tmp > ((1<<(bits-1)) - 1)) ||
+          ((Elf_Sword)tmp < -(1<<(bits-1)))) {
+        printf("Overflow REL14/REL24\n");
+        return false;
+      }
+
+      tmp = *where;
+      tmp &= ~mask;
+      tmp |= (symvalue + rela->r_addend - (Elf_Addr)where) & mask;
+      *where = tmp;
       if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
-        printf ("rtl: reloc RELATIVE in %s --> %p\n", obj->oname, (void *)*where);
+        printf ("rtl: REL24/REL14 %p @ %p in %s\n",
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
       break;
 
-    case R_TYPE(COPY):
+    case R_TYPE(REL32):
       /*
-       * These are deferred until all other relocations have
-       * been done.  All we do here is make sure that the
-       * COPY relocation is not in a shared library.  They
-       * are allowed only in executable files.
+       * value:26; Field:word32*; Expression:S+A-P
        */
-      printf ("rtl: reloc COPY (please report)\n");
+      *where = symvalue + rela->r_addend - (Elf_Addr)where;
+      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
+        printf ("rtl: REL32 %p @ %p in %s\n",
+                (void *)*where, where, rtems_rtl_obj_oname (obj));
       break;
 
     default:
       printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
-              "contents = %p, symbol = %s\n",
+              "contents = %p\n",
               ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info),
-              (void *)rela->r_offset, (void *)*where, symname);
+              (void *)rela->r_offset, (void *)*where);
       rtems_rtl_set_error (EINVAL,
                            "%s: Unsupported relocation type %ld "
                            "in non-PLT relocations",
                            sect->name, (uint32_t) ELF_R_TYPE(rela->r_info));
       return false;
   }
-
-  return false;
+  return true;
 }
 
 bool
-rtems_rtl_elf_relocate_rel (rtems_rtl_obj_t*      obj,
-                            const Elf_Rel*        rel,
-                            rtems_rtl_obj_sect_t* sect,
-                            const Elf_Sym*        sym,
-                            const char*           symname)
+rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t*      obj,
+                            const Elf_Rel*              rel,
+                            const rtems_rtl_obj_sect_t* sect,
+                            const char*                 symname,
+                            const Elf_Byte              syminfo,
+                            const Elf_Word              symvalue)
 {
   printf ("rtl: rel type record not supported; please report\n");
   return false;