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Commit 1efea40d authored by Chris Metcalf's avatar Chris Metcalf
Browse files

arch/tile: support building big-endian kernel 



The toolchain supports big-endian mode now, so add support for building
the kernel to run big-endian as well.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent 73636b1a

arch/tile/include/asm/byteorder.h

+20 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2011 Tilera Corporation. All Rights Reserved.

 *

 *   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, version 2.

 *

 *   This program is distributed in the hope that it will be useful, but

 *   WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 */



#if defined (__BIG_ENDIAN__)

#include <linux/byteorder/big_endian.h>

#elif defined (__LITTLE_ENDIAN__)

#include <linux/byteorder/little_endian.h>

#else

#error "__BIG_ENDIAN__ or __LITTLE_ENDIAN__ must be defined."

#endif

arch/tile/include/asm/elf.h

+5 −0
Original line number Diff line number Diff line
@@ -44,7 +44,11 @@ typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; 
#else

#define ELF_CLASS	ELFCLASS32

#endif

#ifdef __BIG_ENDIAN__

#define ELF_DATA	ELFDATA2MSB

#else

#define ELF_DATA	ELFDATA2LSB

#endif



/*

 * There seems to be a bug in how compat_binfmt_elf.c works: it
@@ -59,6 +63,7 @@ enum { ELF_ARCH = CHIP_ELF_TYPE() }; 
 */

#define elf_check_arch(x)  \

	((x)->e_ident[EI_CLASS] == ELF_CLASS && \

	 (x)->e_ident[EI_DATA] == ELF_DATA && \

	 (x)->e_machine == CHIP_ELF_TYPE())



/* The module loader only handles a few relocation types. */

arch/tile/include/hv/hypervisor.h

+16 −0
Original line number Diff line number Diff line
@@ -494,11 +494,16 @@ int hv_confstr(HV_ConfstrQuery query, HV_VirtAddr buf, int len); 
/** Tile coordinate */

typedef struct

{

#ifndef __BIG_ENDIAN__

  /** X coordinate, relative to supervisor's top-left coordinate */

  int x;



  /** Y coordinate, relative to supervisor's top-left coordinate */

  int y;

#else

  int y;

  int x;

#endif

} HV_Coord;
@@ -986,8 +991,13 @@ HV_VirtAddrRange hv_inquire_virtual(int idx); 
/** A range of ASID values. */

typedef struct

{

#ifndef __BIG_ENDIAN__

  HV_ASID start;        /**< First ASID in the range. */

  unsigned int size;    /**< Number of ASIDs. Zero for an invalid range. */

#else

  unsigned int size;    /**< Number of ASIDs. Zero for an invalid range. */

  HV_ASID start;        /**< First ASID in the range. */

#endif

} HV_ASIDRange;



/** Returns information about a range of ASIDs.
@@ -1308,6 +1318,7 @@ typedef enum 
/** Message recipient. */

typedef struct

{

#ifndef __BIG_ENDIAN__

  /** X coordinate, relative to supervisor's top-left coordinate */

  unsigned int x:11;
@@ -1316,6 +1327,11 @@ typedef struct 


  /** Status of this recipient */

  HV_Recip_State state:10;

#else //__BIG_ENDIAN__

  HV_Recip_State state:10;

  unsigned int y:11;

  unsigned int x:11;

#endif

} HV_Recipient;



/** Send a message to a set of recipients.

arch/tile/kernel/module.c

+11 −1
Original line number Diff line number Diff line
@@ -159,7 +159,17 @@ int apply_relocate_add(Elf_Shdr *sechdrs, 


		switch (ELF_R_TYPE(rel[i].r_info)) {



#define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value)))

#ifdef __LITTLE_ENDIAN

# define MUNGE(func) \

	(*location = ((*location & ~func(-1)) | func(value)))

#else

/*

 * Instructions are always little-endian, so when we read them as data,

 * we have to swap them around before and after modifying them.

 */

# define MUNGE(func) \

	(*location = swab64((swab64(*location) & ~func(-1)) | func(value)))

#endif



#ifndef __tilegx__

		case R_TILE_32:

arch/tile/kernel/single_step.c

+12 −4
Original line number Diff line number Diff line
@@ -172,9 +172,6 @@ static tile_bundle_bits rewrite_load_store_unaligned( 
		return (tilepro_bundle_bits) 0;

	}



#ifndef __LITTLE_ENDIAN

# error We assume little-endian representation with copy_xx_user size 2 here

#endif

	/* Handle unaligned load/store */

	if (mem_op == MEMOP_LOAD || mem_op == MEMOP_LOAD_POSTINCR) {

		unsigned short val_16;
@@ -195,8 +192,19 @@ static tile_bundle_bits rewrite_load_store_unaligned( 
			state->update = 1;

		}

	} else {

		unsigned short val_16;

		val = (val_reg == TREG_ZERO) ? 0 : regs->regs[val_reg];

		err = copy_to_user(addr, &val, size);

		switch (size) {

		case 2:

			val_16 = val;

			err = copy_to_user(addr, &val_16, sizeof(val_16));

			break;

		case 4:

			err = copy_to_user(addr, &val, sizeof(val));

			break;

		default:

			BUG();

		}

	}



	if (err) {