From e5649e61768bfd26d48aa44076d2c1e801a3e8cb Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Tue, 17 Feb 2004 10:55:59 +0000
Subject: Seperate out the startup stuff from the non-startup stuff. Begin
 converting some big ugly macros to inline functions instead

---
 ldso/ldso/powerpc/dl-startup.h | 53 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

(limited to 'ldso/ldso/powerpc/dl-startup.h')

diff --git a/ldso/ldso/powerpc/dl-startup.h b/ldso/ldso/powerpc/dl-startup.h
index 70e494331..a167ae866 100644
--- a/ldso/ldso/powerpc/dl-startup.h
+++ b/ldso/ldso/powerpc/dl-startup.h
@@ -18,3 +18,56 @@ asm("" \
 );
 
 #define DL_BOOT(X) static void __attribute__ ((unused)) _dl_boot2(X)
+
+/*
+ * Get a pointer to the argv array.  On many platforms this can be just
+ * the address if the first argument, on other platforms we need to
+ * do something a little more subtle here.
+ */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long*) ARGS)+1)
+
+/*
+ * Here is a macro to perform a relocation.  This is only used when
+ * bootstrapping the dynamic loader.  RELP is the relocation that we
+ * are performing, REL is the pointer to the address we are relocating.
+ * SYMBOL is the symbol involved in the relocation, and LOAD is the
+ * load address.
+ */
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB) \
+	{int type=ELF32_R_TYPE((RELP)->r_info);		\
+	 Elf32_Addr finaladdr=(SYMBOL)+(RELP)->r_addend;\
+	if (type==R_PPC_RELATIVE) {			\
+		*REL=(Elf32_Word)(LOAD)+(RELP)->r_addend;\
+	} else if (type==R_PPC_JMP_SLOT) {		\
+		Elf32_Sword delta=finaladdr-(Elf32_Word)(REL);\
+		*REL=OPCODE_B(delta);			\
+	} else if (type==R_PPC_ADDR32) {		\
+		*REL=finaladdr;				\
+	} else {					\
+	  _dl_exit(100+ELF32_R_TYPE((RELP)->r_info));	\
+	}						\
+	PPC_DCBST(REL); PPC_SYNC; PPC_ICBI(REL);	\
+	}
+/*
+ * Transfer control to the user's application, once the dynamic loader
+ * is done.  This routine has to exit the current function, then
+ * call the _dl_elf_main function.
+ */
+
+/* hgb@ifi.uio.no:
+ * Adding a clobber list consisting of r0 for %1.  addi on PowerPC
+ * takes a register as the second argument, but if the register is
+ * r0, the value 0 is used instead.  If r0 is used here, the stack
+ * pointer (r1) will be zeroed, and the dynamically linked
+ * application will seg.fault immediatly when receiving control.
+ */
+#define START()		\
+	__asm__ volatile ( \
+		    "addi 1,%1,0\n\t" \
+		    "mtlr %0\n\t" \
+		    "blrl\n\t"	\
+		    : : "r" (_dl_elf_main), "r" (args) \
+		    : "r0")
+
+
+
-- 
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