Clean up the _dl_boot code and make it similar to arm and sh.

diff --git a/ldso/ldso/powerpc/dl-startup.h b/ldso/ldso/powerpc/dl-startup.h
index f8e14e0..37d3cf0 100644 (file)
--- a/ldso/ldso/powerpc/dl-startup.h
+++ b/ldso/ldso/powerpc/dl-startup.h
@@ -4,20 +4,25 @@
 
 /* Overrive the default _dl_boot function, and replace it with a bit of asm.
  * Then call the real _dl_boot function, which is now named _dl_boot2. */
-
-asm("" \
-"      .text\n"                        \
-"      .globl  _dl_boot\n"             \
-"_dl_boot:\n"                          \
-"      mr      3,1\n"          \
-"      li      4,0\n"                  \
-"      addi    1,1,-16\n"              \
-"      stw     4,0(1)\n"               \
-"      bl      _dl_boot2\n"            \
-".previous\n"                          \
+asm(
+    "  .text\n"
+    "  .globl  _dl_boot\n"
+    "  .type   _dl_boot,@function\n"
+    "_dl_boot:\n"
+    "  mr      3,1\n" /* Pass SP to _dl_boot2 in r3 */
+    "  addi    1,1,-16\n" /* Make room on stack for _dl_boot2 to store LR */
+    "  li      4,0\n"
+    "  stw     4,0(1)\n" /* Clear Stack frame */
+    "  bl      _dl_boot2@local\n" /* Perform relocation */
+    "  addi    1,1,16\n" /* Restore SP */
+    "  mtctr   3\n" /* Load applications entry point */
+    "  bctr\n" /* Jump to entry point */
+    "  .size   _dl_boot,.-_dl_boot\n"
+    "  .previous\n"
 );
 
-#define DL_BOOT(X) static void __attribute_used__ _dl_boot2(X)
+
+#define DL_BOOT(X) static void* __attribute_used__ _dl_boot2(X)
 
 /*
  * Get a pointer to the argv array.  On many platforms this can be just
@@ -53,17 +58,4 @@ asm("" \
  * is done.  This routine has to exit the current function, then
  * call the _dl_elf_main function.
  */
-
-/*
- * Use "b"(Address base register) operand for %1 since "b" excludes
- * r0 which is important for the addi instruction in this case. 
- */
-#define START()                \
-       __asm__ volatile ( \
-                   "addi 1,%1,0\n\t" \
-                   "mtlr %0\n\t" \
-                   "blrl\n\t"  \
-                   : : "r" (_dl_elf_main), "b" (args))
-
-
-
+#define START()            return _dl_elf_main