102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/*
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* arch/blackfin/kernel/flat.c
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*
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* Copyright (C) 2007 Analog Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/flat.h>
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#define FLAT_BFIN_RELOC_TYPE_16_BIT 0
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#define FLAT_BFIN_RELOC_TYPE_16H_BIT 1
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#define FLAT_BFIN_RELOC_TYPE_32_BIT 2
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unsigned long bfin_get_addr_from_rp(unsigned long *ptr,
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unsigned long relval,
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unsigned long flags,
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unsigned long *persistent)
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{
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unsigned short *usptr = (unsigned short *)ptr;
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int type = (relval >> 26) & 7;
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unsigned long val;
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switch (type) {
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case FLAT_BFIN_RELOC_TYPE_16_BIT:
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case FLAT_BFIN_RELOC_TYPE_16H_BIT:
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usptr = (unsigned short *)ptr;
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pr_debug("*usptr = %x", get_unaligned(usptr));
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val = get_unaligned(usptr);
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val += *persistent;
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break;
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case FLAT_BFIN_RELOC_TYPE_32_BIT:
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pr_debug("*ptr = %lx", get_unaligned(ptr));
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val = get_unaligned(ptr);
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break;
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default:
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pr_debug("BINFMT_FLAT: Unknown relocation type %x\n",
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type);
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return 0;
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}
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/*
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* Stack-relative relocs contain the offset into the stack, we
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* have to add the stack's start address here and return 1 from
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* flat_addr_absolute to prevent the normal address calculations
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*/
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if (relval & (1 << 29))
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return val + current->mm->context.end_brk;
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if ((flags & FLAT_FLAG_GOTPIC) == 0)
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val = htonl(val);
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return val;
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}
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EXPORT_SYMBOL(bfin_get_addr_from_rp);
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/*
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* Insert the address ADDR into the symbol reference at RP;
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* RELVAL is the raw relocation-table entry from which RP is derived
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*/
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void bfin_put_addr_at_rp(unsigned long *ptr, unsigned long addr,
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unsigned long relval)
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{
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unsigned short *usptr = (unsigned short *)ptr;
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int type = (relval >> 26) & 7;
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switch (type) {
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case FLAT_BFIN_RELOC_TYPE_16_BIT:
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put_unaligned(addr, usptr);
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pr_debug("new value %x at %p", get_unaligned(usptr),
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usptr);
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break;
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case FLAT_BFIN_RELOC_TYPE_16H_BIT:
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put_unaligned(addr >> 16, usptr);
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pr_debug("new value %x", get_unaligned(usptr));
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break;
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case FLAT_BFIN_RELOC_TYPE_32_BIT:
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put_unaligned(addr, ptr);
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pr_debug("new ptr =%lx", get_unaligned(ptr));
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break;
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}
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}
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EXPORT_SYMBOL(bfin_put_addr_at_rp);
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