From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/frv/mm/elf-fdpic.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 arch/frv/mm/elf-fdpic.c

(limited to 'arch/frv/mm/elf-fdpic.c')

diff --git a/arch/frv/mm/elf-fdpic.c b/arch/frv/mm/elf-fdpic.c
new file mode 100644
index 000000000..836f14707
--- /dev/null
+++ b/arch/frv/mm/elf-fdpic.c
@@ -0,0 +1,113 @@
+/* elf-fdpic.c: ELF FDPIC memory layout management
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/elf-fdpic.h>
+#include <asm/mman.h>
+
+/*****************************************************************************/
+/*
+ * lay out the userspace VM according to our grand design
+ */
+#ifdef CONFIG_MMU
+void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params,
+			       struct elf_fdpic_params *interp_params,
+			       unsigned long *start_stack,
+			       unsigned long *start_brk)
+{
+	*start_stack = 0x02200000UL;
+
+	/* if the only executable is a shared object, assume that it is an interpreter rather than
+	 * a true executable, and map it such that "ld.so --list" comes out right
+	 */
+	if (!(interp_params->flags & ELF_FDPIC_FLAG_PRESENT) &&
+	    exec_params->hdr.e_type != ET_EXEC
+	    ) {
+		exec_params->load_addr = PAGE_SIZE;
+
+		*start_brk = 0x80000000UL;
+	}
+	else {
+		exec_params->load_addr = 0x02200000UL;
+
+		if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
+		    ELF_FDPIC_FLAG_INDEPENDENT
+		    ) {
+			exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT;
+			exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP;
+		}
+	}
+
+} /* end elf_fdpic_arch_lay_out_mm() */
+#endif
+
+/*****************************************************************************/
+/*
+ * place non-fixed mmaps firstly in the bottom part of memory, working up, and then in the top part
+ * of memory, working down
+ */
+unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len,
+				     unsigned long pgoff, unsigned long flags)
+{
+	struct vm_area_struct *vma;
+	struct vm_unmapped_area_info info;
+
+	if (len > TASK_SIZE)
+		return -ENOMEM;
+
+	/* handle MAP_FIXED */
+	if (flags & MAP_FIXED)
+		return addr;
+
+	/* only honour a hint if we're not going to clobber something doing so */
+	if (addr) {
+		addr = PAGE_ALIGN(addr);
+		vma = find_vma(current->mm, addr);
+		if (TASK_SIZE - len >= addr &&
+		    (!vma || addr + len <= vma->vm_start))
+			goto success;
+	}
+
+	/* search between the bottom of user VM and the stack grow area */
+	info.flags = 0;
+	info.length = len;
+	info.low_limit = PAGE_SIZE;
+	info.high_limit = (current->mm->start_stack - 0x00200000);
+	info.align_mask = 0;
+	info.align_offset = 0;
+	addr = vm_unmapped_area(&info);
+	if (!(addr & ~PAGE_MASK))
+		goto success;
+	VM_BUG_ON(addr != -ENOMEM);
+
+	/* search from just above the WorkRAM area to the top of memory */
+	info.low_limit = PAGE_ALIGN(0x80000000);
+	info.high_limit = TASK_SIZE;
+	addr = vm_unmapped_area(&info);
+	if (!(addr & ~PAGE_MASK))
+		goto success;
+	VM_BUG_ON(addr != -ENOMEM);
+
+#if 0
+	printk("[area] l=%lx (ENOMEM) f='%s'\n",
+	       len, filp ? filp->f_path.dentry->d_name.name : "");
+#endif
+	return -ENOMEM;
+
+ success:
+#if 0
+	printk("[area] l=%lx ad=%lx f='%s'\n",
+	       len, addr, filp ? filp->f_path.dentry->d_name.name : "");
+#endif
+	return addr;
+} /* end arch_get_unmapped_area() */
-- 
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