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Subject[PATCH 36/57] microblaze_v7: headers for executables format FLAT, ELF
Date
From: Michal Simek <monstr@monstr.eu>


Signed-off-by: Michal Simek <monstr@monstr.eu>
---
arch/microblaze/include/asm/elf.h | 30 ++++++++++++
arch/microblaze/include/asm/flat.h | 90 ++++++++++++++++++++++++++++++++++++
2 files changed, 120 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/include/asm/elf.h
create mode 100644 arch/microblaze/include/asm/flat.h
diff --git a/arch/microblaze/include/asm/elf.h b/arch/microblaze/include/asm/elf.h
new file mode 100644
index 0000000..81337f2
--- /dev/null
+++ b/arch/microblaze/include/asm/elf.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_ELF_H
+#define _ASM_MICROBLAZE_ELF_H
+
+/*
+ * Note there is no "official" ELF designation for Microblaze.
+ * I've snaffled the value from the microblaze binutils source code
+ * /binutils/microblaze/include/elf/microblaze.h
+ */
+#define EM_XILINX_MICROBLAZE 0xbaab
+#define ELF_ARCH EM_XILINX_MICROBLAZE
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x) ((x)->e_machine == EM_XILINX_MICROBLAZE)
+
+/*
+ * These are used to set parameters in the core dumps.
+ */
+#define ELF_CLASS ELFCLASS32
+
+#endif /* _ASM_MICROBLAZE_ELF_H */
diff --git a/arch/microblaze/include/asm/flat.h b/arch/microblaze/include/asm/flat.h
new file mode 100644
index 0000000..acf0da5
--- /dev/null
+++ b/arch/microblaze/include/asm/flat.h
@@ -0,0 +1,90 @@
+/*
+ * uClinux flat-format executables
+ *
+ * Copyright (C) 2005 John Williams <jwilliams@itee.uq.edu.au>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file COPYING in the main directory of this
+ * archive for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_FLAT_H
+#define _ASM_MICROBLAZE_FLAT_H
+
+#include <asm/unaligned.h>
+
+#define flat_stack_align(sp) /* nothing needed */
+#define flat_argvp_envp_on_stack() 0
+#define flat_old_ram_flag(flags) (flags)
+#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
+#define flat_set_persistent(relval, p) 0
+
+/*
+ * Microblaze works a little differently from other arches, because
+ * of the MICROBLAZE_64 reloc type. Here, a 32 bit address is split
+ * over two instructions, an 'imm' instruction which provides the top
+ * 16 bits, then the instruction "proper" which provides the low 16
+ * bits.
+ */
+
+/*
+ * Crack open a symbol reference and extract the address to be
+ * relocated. rp is a potentially unaligned pointer to the
+ * reference
+ */
+
+static inline unsigned long
+flat_get_addr_from_rp(unsigned long *rp, unsigned long relval,
+ unsigned long flags, unsigned long *persistent)
+{
+ unsigned long addr;
+ (void)flags;
+
+ /* Is it a split 64/32 reference? */
+ if (relval & 0x80000000) {
+ /* Grab the two halves of the reference */
+ unsigned long val_hi, val_lo;
+
+ val_hi = get_unaligned(rp);
+ val_lo = get_unaligned(rp+1);
+
+ /* Crack the address out */
+ addr = ((val_hi & 0xffff) << 16) + (val_lo & 0xffff);
+ } else {
+ /* Get the address straight out */
+ addr = get_unaligned(rp);
+ }
+
+ return addr;
+}
+
+/*
+ * Insert an address into the symbol reference at rp. rp is potentially
+ * unaligned.
+ */
+
+static inline void
+flat_put_addr_at_rp(unsigned long *rp, unsigned long addr, unsigned long relval)
+{
+ /* Is this a split 64/32 reloc? */
+ if (relval & 0x80000000) {
+ /* Get the two "halves" */
+ unsigned long val_hi = get_unaligned(rp);
+ unsigned long val_lo = get_unaligned(rp + 1);
+
+ /* insert the address */
+ val_hi = (val_hi & 0xffff0000) | addr >> 16;
+ val_lo = (val_lo & 0xffff0000) | (addr & 0xffff);
+
+ /* store the two halves back into memory */
+ put_unaligned(val_hi, rp);
+ put_unaligned(val_lo, rp+1);
+ } else {
+ /* Put it straight in, no messing around */
+ put_unaligned(addr, rp);
+ }
+}
+
+#define flat_get_relocate_addr(rel) (rel & 0x7fffffff)
+
+#endif /* _ASM_MICROBLAZE_FLAT_H */
--
1.5.5.1


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