85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* Copyright 2007 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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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", 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), 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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