Avoid hardcoding the kernel link address in the linker script.

Use KERNBASE instead. While here, move the text sections
forward to the beginning of the text segment.

sys/conf/ldscript.powerpc

@@ -10,7 +10,20 @@ PROVIDE (__stack = 0);
 SECTIONS
 {
   /* Read-only sections, merged into text segment: */
-  . = 0x00100000 + SIZEOF_HEADERS;
+
+  . = kernbase + SIZEOF_HEADERS;
+
+  .text      :
+  {
+    *(.text)
+    *(.stub)
+    /* .gnu.warning sections are handled specially by elf32.em.  */
+    *(.gnu.warning)
+    *(.gnu.linkonce.t*)
+  } =0
+  _etext = .;
+  PROVIDE (etext = .);
+
   .interp     : { *(.interp) 	}
   .hash          : { *(.hash)		}
   .dynsym        : { *(.dynsym)		}
@@ -37,15 +50,7 @@ SECTIONS
   .rela.sbss     : { *(.rela.sbss)		}
   .rela.sdata2   : { *(.rela.sdata2)		}
   .rela.sbss2    : { *(.rela.sbss2)		}
-  .text      :
-  {
-    *(.text)
-    /* .gnu.warning sections are handled specially by elf32.em.  */
-    *(.gnu.warning)
-    *(.gnu.linkonce.t*)
-  } =0
-  _etext = .;
-  PROVIDE (etext = .);
+
   .init      : { *(.init)    } =0
   .fini      : { *(.fini)    } =0
   .rodata    : { *(.rodata) *(.gnu.linkonce.r*) }

sys/powerpc/aim/locore.S

@@ -71,6 +71,12 @@
 #define GET_CPUINFO(r)  \
         mfsprg0  r
 
+/*
+ * Compiled KERNBASE location and the kernel load address
+ */
+        .globl  kernbase
+        .set    kernbase, KERNBASE
+
 /*
  * Globals
  */

sys/powerpc/powerpc/genassym.c

@@ -152,4 +152,5 @@ ASSYM(TDF_NEEDRESCHED, TDF_NEEDRESCHED);
 
 ASSYM(SF_UC, offsetof(struct sigframe, sf_uc));
 
+ASSYM(KERNBASE, KERNBASE);
 ASSYM(MAXCOMLEN, MAXCOMLEN);