mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 03:37:18 +07:00
f9720205d1
Add minimum support for the Blackfin relocations, since we don't have enough space in each reloc. The idea is to store a value with one relocation so that subsequent ones can access it. Actually, this patch is required for Blackfin. Currently if BINFMT_FLAT is enabled, git-tree kernel will fail to compile. Signed-off-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Cc: David McCullough <davidm@snapgear.com> Cc: Greg Ungerer <gerg@snapgear.com> Cc: Miles Bader <miles.bader@necel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
134 lines
4.7 KiB
C
134 lines
4.7 KiB
C
/*
|
|
* include/asm-v850/flat.h -- uClinux flat-format executables
|
|
*
|
|
* Copyright (C) 2002,03 NEC Electronics Corporation
|
|
* Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#ifndef __V850_FLAT_H__
|
|
#define __V850_FLAT_H__
|
|
|
|
/* The amount by which a relocation can exceed the program image limits
|
|
without being regarded as an error. On the v850, the relocations of
|
|
some base-pointers can be offset by 0x8000 (to allow better usage of the
|
|
space offered by 16-bit signed offsets -- in most cases the offsets used
|
|
with such a base-pointer will be negative). */
|
|
|
|
#define flat_reloc_valid(reloc, size) ((reloc) <= (size + 0x8000))
|
|
|
|
#define flat_stack_align(sp) /* nothing needed */
|
|
#define flat_argvp_envp_on_stack() 0
|
|
#define flat_old_ram_flag(flags) (flags)
|
|
#define flat_set_persistent(relval, p) 0
|
|
|
|
/* We store the type of relocation in the top 4 bits of the `relval.' */
|
|
|
|
/* Convert a relocation entry into an address. */
|
|
static inline unsigned long
|
|
flat_get_relocate_addr (unsigned long relval)
|
|
{
|
|
return relval & 0x0fffffff; /* Mask out top 4-bits */
|
|
}
|
|
|
|
#define flat_v850_get_reloc_type(relval) ((relval) >> 28)
|
|
|
|
#define FLAT_V850_R_32 0 /* Normal 32-bit reloc */
|
|
#define FLAT_V850_R_HI16S_LO15 1 /* High 16-bits + signed 15-bit low field */
|
|
#define FLAT_V850_R_HI16S_LO16 2 /* High 16-bits + signed 16-bit low field */
|
|
|
|
/* Extract the address to be relocated from the symbol reference at RP;
|
|
RELVAL is the raw relocation-table entry from which RP is derived.
|
|
For the v850, RP should always be half-word aligned. */
|
|
static inline unsigned long flat_get_addr_from_rp (unsigned long *rp,
|
|
unsigned long relval,
|
|
unsigned long flags,
|
|
unsigned long *persistent)
|
|
{
|
|
short *srp = (short *)rp;
|
|
|
|
switch (flat_v850_get_reloc_type (relval))
|
|
{
|
|
case FLAT_V850_R_32:
|
|
/* Simple 32-bit address. */
|
|
return srp[0] | (srp[1] << 16);
|
|
|
|
case FLAT_V850_R_HI16S_LO16:
|
|
/* The high and low halves of the address are in the 16
|
|
bits at RP, and the 2nd word of the 32-bit instruction
|
|
following that, respectively. The low half is _signed_
|
|
so we have to sign-extend it and add it to the upper
|
|
half instead of simply or-ing them together.
|
|
|
|
Unlike most relocated address, this one is stored in
|
|
native (little-endian) byte-order to avoid problems with
|
|
trashing the low-order bit, so we have to convert to
|
|
network-byte-order before returning, as that's what the
|
|
caller expects. */
|
|
return htonl ((srp[0] << 16) + srp[2]);
|
|
|
|
case FLAT_V850_R_HI16S_LO15:
|
|
/* The high and low halves of the address are in the 16
|
|
bits at RP, and the upper 15 bits of the 2nd word of the
|
|
32-bit instruction following that, respectively. The
|
|
low half is _signed_ so we have to sign-extend it and
|
|
add it to the upper half instead of simply or-ing them
|
|
together. The lowest bit is always zero.
|
|
|
|
Unlike most relocated address, this one is stored in
|
|
native (little-endian) byte-order to avoid problems with
|
|
trashing the low-order bit, so we have to convert to
|
|
network-byte-order before returning, as that's what the
|
|
caller expects. */
|
|
return htonl ((srp[0] << 16) + (srp[2] & ~0x1));
|
|
|
|
default:
|
|
return ~0; /* bogus value */
|
|
}
|
|
}
|
|
|
|
/* Insert the address ADDR into the symbol reference at RP;
|
|
RELVAL is the raw relocation-table entry from which RP is derived.
|
|
For the v850, RP should always be half-word aligned. */
|
|
static inline void flat_put_addr_at_rp (unsigned long *rp, unsigned long addr,
|
|
unsigned long relval)
|
|
{
|
|
short *srp = (short *)rp;
|
|
|
|
switch (flat_v850_get_reloc_type (relval)) {
|
|
case FLAT_V850_R_32:
|
|
/* Simple 32-bit address. */
|
|
srp[0] = addr & 0xFFFF;
|
|
srp[1] = (addr >> 16);
|
|
break;
|
|
|
|
case FLAT_V850_R_HI16S_LO16:
|
|
/* The high and low halves of the address are in the 16
|
|
bits at RP, and the 2nd word of the 32-bit instruction
|
|
following that, respectively. The low half is _signed_
|
|
so we must carry its sign bit to the upper half before
|
|
writing the upper half. */
|
|
srp[0] = (addr >> 16) + ((addr >> 15) & 0x1);
|
|
srp[2] = addr & 0xFFFF;
|
|
break;
|
|
|
|
case FLAT_V850_R_HI16S_LO15:
|
|
/* The high and low halves of the address are in the 16
|
|
bits at RP, and the upper 15 bits of the 2nd word of the
|
|
32-bit instruction following that, respectively. The
|
|
low half is _signed_ so we must carry its sign bit to
|
|
the upper half before writing the upper half. The
|
|
lowest bit we preserve from the existing instruction. */
|
|
srp[0] = (addr >> 16) + ((addr >> 15) & 0x1);
|
|
srp[2] = (addr & 0xFFFE) | (srp[2] & 0x1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#endif /* __V850_FLAT_H__ */
|