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/arm/dl-startup.h | 100 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 87 insertions(+), 13 deletions(-)

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

diff --git a/ldso/ldso/arm/dl-startup.h b/ldso/ldso/arm/dl-startup.h
index 6e3033959..d4a1ee79b 100644
--- a/ldso/ldso/arm/dl-startup.h
+++ b/ldso/ldso/arm/dl-startup.h
@@ -1,21 +1,95 @@
-/* Any assmbly language/system dependent hacks needed to setup boot1.c so it
- * will work as expected and cope with whatever platform specific wierdness is
- * needed for this architecture.  */
+/* vi: set sw=4 ts=4: */
+/*
+ * Architecture specific code used by dl-startup.c
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codpoet.org>
+ */
+
 
 /* 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"			\
+asm(""						\
+"	.text\n"				\
 "	.globl	_dl_boot\n"		\
 "_dl_boot:\n"				\
-"	mov	r7, sp\n"		\
-"	@ldr	r0, [sp], #4\n"		\
-"	mov	r0, sp\n"		\
+"	mov	r7, sp\n"			\
+"	@ldr	r0, [sp], #4\n"	\
+"	mov	r0, sp\n"			\
 "	bl	_dl_boot2\n"		\
-"	mov	r6, r0\n"		\
-"	mov	r0, r7\n"		\
-"	mov	pc, r6\n"		\
+"	mov	r6, r0\n"			\
+"	mov	r0, r7\n"			\
+"	mov	pc, r6\n"			\
 );
 
-#define DL_BOOT(X)   static void __attribute__ ((unused)) _dl_boot2 (X)
+#define DL_BOOT(X)   static __attribute__ ((unused)) void* _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)
+
+/* Handle relocation of the symbols in the dynamic loader. */
+static inline
+void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
+	unsigned long symbol_addr, unsigned long load_addr, Elf32_Sym *symtab)
+{
+	switch (ELF32_R_TYPE(rpnt->r_info)) {
+		case R_ARM_NONE:
+			break;
+		case R_ARM_ABS32:
+			*reloc_addr += symbol_addr;
+			break;
+		case R_ARM_PC24:
+			{
+				unsigned long addend;
+				long newvalue, topbits;
+
+				addend = *reloc_addr & 0x00ffffff;
+				if (addend & 0x00800000) addend |= 0xff000000;
+
+				newvalue = symbol_addr - (unsigned long)reloc_addr + (addend << 2);
+				topbits = newvalue & 0xfe000000;
+				if (topbits != 0xfe000000 && topbits != 0x00000000)
+				{
+#if 0
+					// Don't bother with this during ldso initilization...
+					newvalue = fix_bad_pc24(reloc_addr, symbol_addr)
+						- (unsigned long)reloc_addr + (addend << 2);
+					topbits = newvalue & 0xfe000000;
+					if (unlikely(topbits != 0xfe000000 && topbits != 0x00000000))
+					{
+						SEND_STDERR("R_ARM_PC24 relocation out of range\n");
+						_dl_exit(1);
+					}
+#else
+					SEND_STDERR("R_ARM_PC24 relocation out of range\n");
+					_dl_exit(1);
+#endif
+				}
+				newvalue >>= 2;
+				symbol_addr = (*reloc_addr & 0xff000000) | (newvalue & 0x00ffffff);
+				*reloc_addr = symbol_addr;
+				break;
+			}
+		case R_ARM_GLOB_DAT:
+		case R_ARM_JUMP_SLOT:
+			*reloc_addr = symbol_addr;
+			break;
+		case R_ARM_RELATIVE:
+			*reloc_addr += load_addr;
+			break;
+		case R_ARM_COPY:
+			break;
+		default:
+			SEND_STDERR("Unsupported relocation type\n");
+			_dl_exit(1);
+	}
+}
+
+
+/* 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.  */
+#define START()   return _dl_elf_main;
+
+
-- 
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