- add Linux/PPC linker script

- always relocate Basilisk II binary to 0x78048000 on MacOS X (including x86,
  to be tested later)

BasiliskII/src/Unix/configure.ac

@@ -1101,9 +1101,10 @@ dnl Check for linker script support
 case $target_os:$target_cpu in
 linux*:i?86)    LINKER_SCRIPT_FLAGS="-Wl,-T,ldscripts/linux-i386.ld";;
 linux*:x86_64)  LINKER_SCRIPT_FLAGS="-Wl,-T,ldscripts/linux-x86_64.ld";;
+linux*:powerpc) LINKER_SCRIPT_FLAGS="-Wl,-T,ldscripts/linux-ppc.ld";;
 netbsd*:i?86)   LINKER_SCRIPT_FLAGS="-Wl,-T,ldscripts/linux-i386.ld";;
 freebsd*:i?86)  LINKER_SCRIPT_FLAGS="-Wl,-T,ldscripts/freebsd-i386.ld";;
-darwin*:powerpc)LINKER_SCRIPT_FLAGS="-Wl,-seg1addr,0x78048000";;
+darwin*:*)      LINKER_SCRIPT_FLAGS="-Wl,-seg1addr,0x78048000";;
 esac
 if [[ -n "$LINKER_SCRIPT_FLAGS" ]]; then
   AC_CACHE_CHECK([whether linker script is usable],

BasiliskII/src/Unix/ldscripts/linux-ppc.ld

@@ -0,0 +1,219 @@
+/* Script for -z combreloc: combine and sort reloc sections */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
+ENTRY(_start)
+SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib"); SEARCH_DIR("/usr/local/lib");
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  . = 0x78048000 + SIZEOF_HEADERS;
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+  {
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+  {
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+    KEEP (*(.text.*personality*))
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+  /* Ensure the __preinit_array_start label is properly aligned.  We
+     could instead move the label definition inside the section, but
+     the linker would then create the section even if it turns out to
+     be empty, which isn't pretty.  */
+  . = ALIGN(32 / 8);
+  PROVIDE (__preinit_array_start = .);
+  .preinit_array     : { KEEP (*(.preinit_array)) }
+  PROVIDE (__preinit_array_end = .);
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+  PROVIDE (__init_array_end = .);
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+  PROVIDE (__fini_array_end = .);
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+       the constructors, so we make sure it is
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+       actually link against crtbegin.o; the
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+    /* We don't want to include the .ctor section from
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+       The .ctor section from the crtend file contains the
+       end of ctors marker and it must be last */
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
+    KEEP (*(SORT(.ctors.*)))
+    KEEP (*(.ctors))
+  }
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+  {
+    KEEP (*crtbegin*.o(.dtors))
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
+    KEEP (*(SORT(.dtors.*)))
+    KEEP (*(.dtors))
+  }
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+  . = DATA_SEGMENT_RELRO_END (0, .);
+  .data           :
+  {
+    *(.data .data.* .gnu.linkonce.d.*)
+    KEEP (*(.gnu.linkonce.d.*personality*))
+    SORT(CONSTRUCTORS)
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+}