Patch from Paul Mundt <lethal@linux-sh.org>:

Here's the patch for the ldso bits for sh64. This is still in need of a bunch
of debugging, testing, etc. and is really only being submitted for general
completeness. This assumes that the previous patches I've submitted have
already been applied.

I plan on playing with this and buildroot some more later, as I'd definitely
like to see buildroot images for sh64.

1 files changed, 170 insertions, 0 deletions

diff --git a/ldso/ldso/sh64/dl-sysdep.h b/ldso/ldso/sh64/dl-sysdep.h
new file mode 100644
index 000000000..241cde93e
--- /dev/null
+++ b/ldso/ldso/sh64/dl-sysdep.h
@@ -0,0 +1,170 @@
+/* vi: set sw=8 ts=8: */
+/*
+ * Various assmbly language/system dependent  hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ */
+
+/* 
+ * Define this if the system uses RELOCA.
+ */
+#define ELF_USES_RELOCA
+
+/*
+ * 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)
+
+/*
+ * Initialization sequence for a GOT.
+ */
+#define INIT_GOT(GOT_BASE,MODULE)				\
+{								\
+	GOT_BASE[2] = (unsigned long)_dl_linux_resolve;		\
+	GOT_BASE[1] = (unsigned long)(MODULE);			\
+}
+
+/*
+ * 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.
+ */
+
+/* 
+ * We need to do this stupidity here as the preprocessor will choke when
+ * SYMTAB is NULL if we do this in PERFORM_BOOTSTRAP_RELOC().
+ */
+
+#include <elf.h>
+
+static inline int __extract_lsb_from_symtab(Elf32_Sym *symtab)
+{
+	static int lsb = 0;
+
+	/* Check for SHmedia/SHcompact */
+	if (symtab)
+		lsb = symtab->st_other & 4;
+	
+	return lsb;
+}
+
+/*
+ * While on the subject of stupidity, there appear to be some conflicts with
+ * regards to several relocation types as far as binutils is concerned
+ * (Barcelona and Madrid both appear to use an out of date elf.h, whereas
+ * native Catalonia has all of the necessary definitions. As a workaround,
+ * we'll just define them here for sanity..
+ */
+#ifndef R_SH_RELATIVE_LOW16
+#  define R_SH_RELATIVE_LOW16		197
+#  define R_SH_RELATIVE_MEDLOW16	198
+#  define R_SH_IMM_LOW16		246
+#  define R_SH_IMM_LOW16_PCREL		247
+#  define R_SH_IMM_MEDLOW16		248
+#  define R_SH_IMM_MEDLOW16_PCREL	249
+#endif
+
+#define PERFORM_BOOTSTRAP_RELOC(RELP,REL,SYMBOL,LOAD,SYMTAB)		\
+	const unsigned int r_type = ELF32_R_TYPE((RELP)->r_info);	\
+	int lsb = __extract_lsb_from_symtab(SYMTAB);			\
+									\
+	switch (r_type)	{						\
+	case R_SH_REL32:						\
+		*(REL)  = (SYMBOL) + (RELP)->r_addend			\
+			    - (unsigned long)(REL);			\
+		break;							\
+	case R_SH_DIR32:						\
+	case R_SH_GLOB_DAT:						\
+	case R_SH_JMP_SLOT:						\
+		*(REL)  = ((SYMBOL) + (RELP)->r_addend) | lsb;		\
+		break;							\
+	case R_SH_RELATIVE:						\
+		*(REL)  = (LOAD) + (RELP)->r_addend;			\
+		break;							\
+	case R_SH_RELATIVE_LOW16:					\
+	case R_SH_RELATIVE_MEDLOW16:					\
+	{								\
+		unsigned long word, value;				\
+									\
+		word = (unsigned long)(REL) & ~0x3fffc00;		\
+		value = (LOAD) + (RELP)->r_addend;			\
+									\
+		if (r_type == R_SH_RELATIVE_MEDLOW16)			\
+			value >>= 16;					\
+									\
+		word |= (value & 0xffff) << 10;				\
+		*(REL)	= word;						\
+		break;							\
+	}								\
+	case R_SH_IMM_LOW16:						\
+	case R_SH_IMM_MEDLOW16:						\
+	{								\
+		unsigned long word, value;				\
+									\
+		word = (unsigned long)(REL) & ~0x3fffc00;		\
+		value = ((SYMBOL) + (RELP)->r_addend) | lsb;		\
+									\
+		if (r_type == R_SH_IMM_MEDLOW16)			\
+			value >>= 16;					\
+									\
+		word |= (value & 0xffff) << 10;				\
+		*(REL)	= word;						\
+		break;							\
+	}								\
+	case R_SH_IMM_LOW16_PCREL:					\
+	case R_SH_IMM_MEDLOW16_PCREL:					\
+	{								\
+		unsigned long word, value;				\
+									\
+		word = (unsigned long)(REL) & ~0x3fffc00;		\
+		value = (SYMBOL) + (RELP)->r_addend			\
+			  - (unsigned long)(REL);			\
+									\
+		if (r_type == R_SH_IMM_MEDLOW16_PCREL)			\
+			value >>= 16;					\
+									\
+		word |= (value & 0xffff) << 10;				\
+		*(REL)	= word;						\
+		break;							\
+	}								\
+	case R_SH_NONE:							\
+		break;							\
+	default:							\
+		SEND_STDERR("BOOTSTRAP_RELOC: unhandled reloc type ");	\
+		SEND_NUMBER_STDERR(ELF32_R_TYPE((RELP)->r_info), 1);	\
+		SEND_STDERR("REL, SYMBOL, LOAD: ");			\
+		SEND_ADDRESS_STDERR(REL, 0);				\
+		SEND_STDERR(", ");					\
+		SEND_ADDRESS_STDERR(SYMBOL, 0);				\
+		SEND_STDERR(", ");					\
+		SEND_ADDRESS_STDERR(LOAD, 1);				\
+		_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;
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_SH
+#undef  MAGIC2
+/* Used for error messages */
+#define ELF_TARGET "sh64"
+
+struct elf_resolve;
+extern unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+#define do_rem(result, n, base)  result = (n % base)
+
+/* 4096 bytes alignment */
+#define PAGE_ALIGN 0xfffff000
+#define ADDR_ALIGN 0xfff
+#define OFFS_ALIGN 0x7ffff000
+