132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/*
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* include/asm-v850/flat.h -- uClinux flat-format executables
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*
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* Copyright (C) 2002,03 NEC Electronics Corporation
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* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file COPYING in the main directory of this
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* archive for more details.
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*
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* Written by Miles Bader <miles@gnu.org>
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*/
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#ifndef __V850_FLAT_H__
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#define __V850_FLAT_H__
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/* The amount by which a relocation can exceed the program image limits
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without being regarded as an error. On the v850, the relocations of
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some base-pointers can be offset by 0x8000 (to allow better usage of the
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space offered by 16-bit signed offsets -- in most cases the offsets used
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with such a base-pointer will be negative). */
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#define flat_reloc_valid(reloc, size) ((reloc) <= (size + 0x8000))
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#define flat_stack_align(sp) /* nothing needed */
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#define flat_argvp_envp_on_stack() 0
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#define flat_old_ram_flag(flags) (flags)
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/* We store the type of relocation in the top 4 bits of the `relval.' */
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/* Convert a relocation entry into an address. */
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static inline unsigned long
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flat_get_relocate_addr (unsigned long relval)
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{
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return relval & 0x0fffffff; /* Mask out top 4-bits */
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}
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#define flat_v850_get_reloc_type(relval) ((relval) >> 28)
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#define FLAT_V850_R_32 0 /* Normal 32-bit reloc */
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#define FLAT_V850_R_HI16S_LO15 1 /* High 16-bits + signed 15-bit low field */
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#define FLAT_V850_R_HI16S_LO16 2 /* High 16-bits + signed 16-bit low field */
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/* Extract the address to be relocated from 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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For the v850, RP should always be half-word aligned. */
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static inline unsigned long flat_get_addr_from_rp (unsigned long *rp,
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unsigned long relval,
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unsigned long flags)
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{
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short *srp = (short *)rp;
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switch (flat_v850_get_reloc_type (relval))
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{
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case FLAT_V850_R_32:
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/* Simple 32-bit address. */
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return srp[0] | (srp[1] << 16);
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case FLAT_V850_R_HI16S_LO16:
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/* The high and low halves of the address are in the 16
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bits at RP, and the 2nd word of the 32-bit instruction
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following that, respectively. The low half is _signed_
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so we have to sign-extend it and add it to the upper
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half instead of simply or-ing them together.
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Unlike most relocated address, this one is stored in
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native (little-endian) byte-order to avoid problems with
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trashing the low-order bit, so we have to convert to
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network-byte-order before returning, as that's what the
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caller expects. */
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return htonl ((srp[0] << 16) + srp[2]);
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case FLAT_V850_R_HI16S_LO15:
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/* The high and low halves of the address are in the 16
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bits at RP, and the upper 15 bits of the 2nd word of the
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32-bit instruction following that, respectively. The
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low half is _signed_ so we have to sign-extend it and
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add it to the upper half instead of simply or-ing them
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together. The lowest bit is always zero.
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Unlike most relocated address, this one is stored in
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native (little-endian) byte-order to avoid problems with
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trashing the low-order bit, so we have to convert to
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network-byte-order before returning, as that's what the
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caller expects. */
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return htonl ((srp[0] << 16) + (srp[2] & ~0x1));
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default:
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return ~0; /* bogus value */
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}
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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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For the v850, RP should always be half-word aligned. */
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static inline void flat_put_addr_at_rp (unsigned long *rp, unsigned long addr,
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unsigned long relval)
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{
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short *srp = (short *)rp;
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switch (flat_v850_get_reloc_type (relval)) {
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case FLAT_V850_R_32:
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/* Simple 32-bit address. */
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srp[0] = addr & 0xFFFF;
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srp[1] = (addr >> 16);
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break;
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case FLAT_V850_R_HI16S_LO16:
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/* The high and low halves of the address are in the 16
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bits at RP, and the 2nd word of the 32-bit instruction
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following that, respectively. The low half is _signed_
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so we must carry its sign bit to the upper half before
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writing the upper half. */
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srp[0] = (addr >> 16) + ((addr >> 15) & 0x1);
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srp[2] = addr & 0xFFFF;
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break;
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case FLAT_V850_R_HI16S_LO15:
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/* The high and low halves of the address are in the 16
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bits at RP, and the upper 15 bits of the 2nd word of the
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32-bit instruction following that, respectively. The
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low half is _signed_ so we must carry its sign bit to
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the upper half before writing the upper half. The
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lowest bit we preserve from the existing instruction. */
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srp[0] = (addr >> 16) + ((addr >> 15) & 0x1);
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srp[2] = (addr & 0xFFFE) | (srp[2] & 0x1);
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break;
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}
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}
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#endif /* __V850_FLAT_H__ */
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