added and modified linker to support SuperH architecture

5 files changed, 224 insertions, 4 deletions

diff --git a/linker/Android.mk b/linker/Android.mk
index 3d3ad92..6c26eb3 100644
--- a/linker/Android.mk
+++ b/linker/Android.mk
@@ -9,7 +9,12 @@ LOCAL_SRC_FILES:= \
 	debugger.c \
 	ba.c
 
+ifeq ($(TARGET_ARCH),sh)
+# SH-4A series virtual address range from 0x00000000 to 0x7FFFFFFF.
+LINKER_TEXT_BASE := 0x70000100
+else
 LINKER_TEXT_BASE := 0xB0000100
+endif
 
 # The maximum size set aside for the linker, from
 # LINKER_TEXT_BASE rounded down to a megabyte.
@@ -31,7 +36,11 @@ else
   ifeq ($(TARGET_ARCH),x86)
     LOCAL_CFLAGS += -DANDROID_X86_LINKER
   else
-    $(error Unsupported TARGET_ARCH $(TARGET_ARCH))
+    ifeq ($(TARGET_ARCH),sh)
+      LOCAL_CFLAGS += -DANDROID_SH_LINKER
+    else
+      $(error Unsupported TARGET_ARCH $(TARGET_ARCH))
+    endif
   endif
 endif
 
diff --git a/linker/arch/sh/begin.S b/linker/arch/sh/begin.S
new file mode 100644
index 0000000..6f49557
--- /dev/null
+++ b/linker/arch/sh/begin.S
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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
+ * COPYRIGHT OWNER OR CONTRIBUTORS 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.
+ */
+.text
+.align  4
+.type   _start,#function
+.globl  _start
+
+_start:
+    mov     r15, r4
+
+    mov.l   0f, r0
+    jsr     @r0
+    nop
+
+    /* linker init returns the _entry address in the main image */
+    jmp     @r0
+    nop
+
+    .balign 4
+0:  .long   __linker_init
+
+    .section .ctors, "wa"
+    .globl  __CTOR_LIST__
+__CTOR_LIST__:
+    .long   -1
diff --git a/linker/dlfcn.c b/linker/dlfcn.c
index b54674f..611bfd3 100644
--- a/linker/dlfcn.c
+++ b/linker/dlfcn.c
@@ -137,6 +137,12 @@ int dlclose(void *handle)
 #define ANDROID_LIBDL_STRTAB \
                       "dlopen\0dlclose\0dlsym\0dlerror\0dl_iterate_phdr\0"
 
+#elif defined(ANDROID_SH_LINKER)
+//                     0000000 00011111 111112 22222222 2333333333344444
+//                     0123456 78901234 567890 12345678 9012345678901234
+#define ANDROID_LIBDL_STRTAB \
+                      "dlopen\0dlclose\0dlsym\0dlerror\0dl_iterate_phdr\0"
+
 #else /* !defined(ANDROID_ARM_LINKER) && !defined(ANDROID_X86_LINKER) */
 #error Unsupported architecture. Only ARM and x86 are presently supported.
 #endif
@@ -181,6 +187,12 @@ static Elf32_Sym libdl_symtab[] = {
       st_info: STB_GLOBAL << 4,
       st_shndx: 1,
     },
+#elif defined(ANDROID_SH_LINKER)
+    { st_name: 29,
+      st_value: (Elf32_Addr) &dl_iterate_phdr,
+      st_info: STB_GLOBAL << 4,
+      st_shndx: 1,
+    },
 #endif
 };
 
diff --git a/linker/linker.c b/linker/linker.c
index 27fe9d7..50eb415 100644
--- a/linker/linker.c
+++ b/linker/linker.c
@@ -345,7 +345,7 @@ _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount)
    *pcount = 0;
     return NULL;
 }
-#elif defined(ANDROID_X86_LINKER)
+#elif defined(ANDROID_X86_LINKER) || defined(ANDROID_SH_LINKER)
 /* Here, we only have to provide a callback to iterate across all the
  * loaded libraries. gcc_eh does the rest. */
 int
@@ -1294,6 +1294,100 @@ static int reloc_library(soinfo *si, Elf32_Rel *rel, unsigned count)
     return 0;
 }
 
+#if defined(ANDROID_SH_LINKER)
+static int reloc_library_a(soinfo *si, Elf32_Rela *rela, unsigned count)
+{
+    Elf32_Sym *symtab = si->symtab;
+    const char *strtab = si->strtab;
+    Elf32_Sym *s;
+    unsigned base;
+    Elf32_Rela *start = rela;
+    unsigned idx;
+
+    for (idx = 0; idx < count; ++idx) {
+        unsigned type = ELF32_R_TYPE(rela->r_info);
+        unsigned sym = ELF32_R_SYM(rela->r_info);
+        unsigned reloc = (unsigned)(rela->r_offset + si->base);
+        unsigned sym_addr = 0;
+        char *sym_name = NULL;
+
+        DEBUG("%5d Processing '%s' relocation at index %d\n", pid,
+              si->name, idx);
+        if(sym != 0) {
+            sym_name = (char *)(strtab + symtab[sym].st_name);
+            s = _do_lookup(si, sym_name, &base);
+            if(s == 0) {
+                DL_ERR("%5d cannot locate '%s'...", pid, sym_name);
+                return -1;
+            }
+#if 0
+            if((base == 0) && (si->base != 0)){
+                    /* linking from libraries to main image is bad */
+                DL_ERR("%5d cannot locate '%s'...",
+                       pid, strtab + symtab[sym].st_name);
+                return -1;
+            }
+#endif
+            if ((s->st_shndx == SHN_UNDEF) && (s->st_value != 0)) {
+                DL_ERR("%5d In '%s', shndx=%d && value=0x%08x. We do not "
+                      "handle this yet", pid, si->name, s->st_shndx,
+                      s->st_value);
+                return -1;
+            }
+            sym_addr = (unsigned)(s->st_value + base);
+            COUNT_RELOC(RELOC_SYMBOL);
+        } else {
+            s = 0;
+        }
+
+/* TODO: This is ugly. Split up the relocations by arch into
+ * different files.
+ */
+        switch(type){
+        case R_SH_JUMP_SLOT:
+            COUNT_RELOC(RELOC_ABSOLUTE);
+            MARK(rela->r_offset);
+            TRACE_TYPE(RELO, "%5d RELO JMP_SLOT %08x <- %08x %s\n", pid,
+                       reloc, sym_addr, sym_name);
+            *((unsigned*)reloc) = sym_addr;
+            break;
+        case R_SH_GLOB_DAT:
+            COUNT_RELOC(RELOC_ABSOLUTE);
+            MARK(rela->r_offset);
+            TRACE_TYPE(RELO, "%5d RELO GLOB_DAT %08x <- %08x %s\n", pid,
+                       reloc, sym_addr, sym_name);
+            *((unsigned*)reloc) = sym_addr;
+            break;
+        case R_SH_DIR32:
+            COUNT_RELOC(RELOC_ABSOLUTE);
+            MARK(rela->r_offset);
+            TRACE_TYPE(RELO, "%5d RELO DIR32 %08x <- %08x %s\n", pid,
+                       reloc, sym_addr, sym_name);
+            *((unsigned*)reloc) += sym_addr;
+            break;
+        case R_SH_RELATIVE:
+            COUNT_RELOC(RELOC_RELATIVE);
+            MARK(rela->r_offset);
+            if(sym){
+                DL_ERR("%5d odd RELATIVE form...", pid);
+                return -1;
+            }
+            TRACE_TYPE(RELO, "%5d RELO RELATIVE %08x <- +%08x\n", pid,
+                       reloc, si->base);
+            *((unsigned*)reloc) += si->base;
+            break;
+
+        default:
+            DL_ERR("%5d unknown reloc type %d @ %p (%d)",
+                  pid, type, rela, (int) (rela - start));
+            return -1;
+        }
+        rela++;
+    }
+    return 0;
+}
+#endif /* ANDROID_SH_LINKER */
+
 
 /* Please read the "Initialization and Termination functions" functions.
  * of the linker design note in bionic/linker/README.TXT to understand
@@ -1546,24 +1640,40 @@ static int link_image(soinfo *si, unsigned wr_offset)
         case DT_SYMTAB:
             si->symtab = (Elf32_Sym *) (si->base + *d);
             break;
+#if !defined(ANDROID_SH_LINKER)
         case DT_PLTREL:
             if(*d != DT_REL) {
                 DL_ERR("DT_RELA not supported");
                 goto fail;
             }
             break;
+#endif
+#ifdef ANDROID_SH_LINKER
+        case DT_JMPREL:
+            si->plt_rela = (Elf32_Rela*) (si->base + *d);
+            break;
+        case DT_PLTRELSZ:
+            si->plt_rela_count = *d / sizeof(Elf32_Rela);
+            break;
+#else
         case DT_JMPREL:
             si->plt_rel = (Elf32_Rel*) (si->base + *d);
             break;
         case DT_PLTRELSZ:
             si->plt_rel_count = *d / 8;
             break;
+#endif
         case DT_REL:
             si->rel = (Elf32_Rel*) (si->base + *d);
             break;
         case DT_RELSZ:
             si->rel_count = *d / 8;
             break;
+#ifdef ANDROID_SH_LINKER
+        case DT_RELASZ:
+            si->rela_count = *d / sizeof(Elf32_Rela);
+             break;
+#endif
         case DT_PLTGOT:
             /* Save this in case we decide to do lazy binding. We don't yet. */
             si->plt_got = (unsigned *)(si->base + *d);
@@ -1572,9 +1682,15 @@ static int link_image(soinfo *si, unsigned wr_offset)
             // Set the DT_DEBUG entry to the addres of _r_debug for GDB
             *d = (int) &_r_debug;
             break;
+#ifdef ANDROID_SH_LINKER
         case DT_RELA:
+            si->rela = (Elf32_Rela *) (si->base + *d);
+            break;
+#else
+         case DT_RELA:
             DL_ERR("%5d DT_RELA not supported", pid);
             goto fail;
+#endif
         case DT_INIT:
             si->init_func = (void (*)(void))(si->base + *d);
             DEBUG("%5d %s constructors (init func) found at %p\n",
@@ -1654,6 +1770,19 @@ static int link_image(soinfo *si, unsigned wr_offset)
             goto fail;
     }
 
+#ifdef ANDROID_SH_LINKER
+    if(si->plt_rela) {
+        DEBUG("[ %5d relocating %s plt ]\n", pid, si->name );
+        if(reloc_library_a(si, si->plt_rela, si->plt_rela_count))
+            goto fail;
+    }
+    if(si->rela) {
+        DEBUG("[ %5d relocating %s ]\n", pid, si->name );
+        if(reloc_library_a(si, si->rela, si->rela_count))
+            goto fail;
+    }
+#endif /* ANDROID_SH_LINKER */
+
     si->flags |= FLAG_LINKED;
     DEBUG("[ %5d finished linking %s ]\n", pid, si->name);
 
diff --git a/linker/linker.h b/linker/linker.h
index 69042c0..2fe61b1 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -122,6 +122,14 @@ struct soinfo
     Elf32_Rel *rel;
     unsigned rel_count;
 
+#ifdef ANDROID_SH_LINKER
+    Elf32_Rela *plt_rela;
+    unsigned plt_rela_count;
+
+    Elf32_Rela *rela;
+    unsigned rela_count;
+#endif /* ANDROID_SH_LINKER */
+
     unsigned *preinit_array;
     unsigned preinit_array_count;
 
@@ -147,10 +155,15 @@ struct soinfo
 extern soinfo libdl_info;
 
 /* these must all be powers of two */
+#ifdef ARCH_SH
+#define LIBBASE 0x60000000
+#define LIBLAST 0x70000000
+#define LIBINC  0x00100000
+#else
 #define LIBBASE 0x80000000
 #define LIBLAST 0x90000000
 #define LIBINC  0x00100000
-
+#endif
 
 #ifdef ANDROID_ARM_LINKER
 
@@ -167,6 +180,13 @@ extern soinfo libdl_info;
 #define R_386_JUMP_SLOT  7
 #define R_386_RELATIVE   8
 
+#elif defined(ANDROID_SH_LINKER)
+
+#define R_SH_DIR32      1
+#define R_SH_GLOB_DAT   163
+#define R_SH_JUMP_SLOT  164
+#define R_SH_RELATIVE   165
+
 #endif /* ANDROID_*_LINKER */
 
 
@@ -209,7 +229,7 @@ const char *linker_get_error(void);
 #ifdef ANDROID_ARM_LINKER 
 typedef long unsigned int *_Unwind_Ptr;
 _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount);
-#elif defined(ANDROID_X86_LINKER)
+#elif defined(ANDROID_X86_LINKER) || defined(ANDROID_SH_LINKER)
 int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *);
 #endif