path: root/drivers/staging/tidspbridge/dynload/tramp.c

/*
 * tramp.c
 *
 * DSP-BIOS Bridge driver support functions for TI OMAP processors.
 *
 * Copyright (C) 2009 Texas Instruments, Inc.
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "header.h"

#if TMS32060
#include "tramp_table_c6000.c"
#endif

#define MAX_RELOS_PER_PASS	4

/*
 * Function:	priv_tramp_sect_tgt_alloc
 * Description: Allocate target memory for the trampoline section.  The
 *	  target mem size is easily obtained as the next available address.
 */
static int priv_tramp_sect_tgt_alloc(struct dload_state *dlthis)
{
	int ret_val = 0;
	struct ldr_section_info *sect_info;

	/*  Populate the trampoline loader section and allocate it on the
	 * target.  The section name is ALWAYS the first string in the final
	 * string table for trampolines.  The trampoline section is always
	 * 1 beyond the total number of allocated sections. */
	sect_info = &dlthis->ldr_sections[dlthis->allocated_secn_count];

	sect_info->name = dlthis->tramp.final_string_table;
	sect_info->size = dlthis->tramp.tramp_sect_next_addr;
	sect_info->context = 0;
	sect_info->type =
	    (4 << 8) | DLOAD_TEXT | DS_ALLOCATE_MASK | DS_DOWNLOAD_MASK;
	sect_info->page = 0;
	sect_info->run_addr = 0;
	sect_info->load_addr = 0;
	ret_val = dlthis->myalloc->dload_allocate(dlthis->myalloc,
						  sect_info,
						  ds_alignment
						  (sect_info->type));

	if (ret_val == 0)
		dload_error(dlthis, "Failed to allocate target memory for"
			    " trampoline");

	return ret_val;
}

/*
 * Function:	priv_h2a
 * Description: Helper function to convert a hex value to its ASCII
 *	  representation.  Used for trampoline symbol name generation.
 */
static u8 priv_h2a(u8 value)
{
	if (value > 0xF)
		return 0xFF;

	if (value <= 9)
		value += 0x30;
	else
		value += 0x37;

	return value;
}

/*
 * Function:	priv_tramp_sym_gen_name
 * Description: Generate a trampoline symbol name (ASCII) using the value
 *	  of the symbol.  This places the new name into the user buffer.
 *	  The name is fixed in length and of the form: __$dbTR__xxxxxxxx
 *	  (where "xxxxxxxx" is the hex value).
 */
static void priv_tramp_sym_gen_name(u32 value, char *dst)
{
	u32 i;
	char *prefix = TRAMP_SYM_PREFIX;
	char *dst_local = dst;
	u8 tmp;

	/*  Clear out the destination, including the ending NULL */
	for (i = 0; i < (TRAMP_SYM_PREFIX_LEN + TRAMP_SYM_HEX_ASCII_LEN); i++)
		*(dst_local + i) = 0;

	/*  Copy the prefix to start */
	for (i = 0; i < strlen(TRAMP_SYM_PREFIX); i++) {
		*dst_local = *(prefix + i);
		dst_local++;
	}

	/*  Now convert the value passed in to a string equiv of the hex */
	for (i = 0; i < sizeof(value); i++) {
#ifndef _BIG_ENDIAN
		tmp = *(((u8 *) &value) + (sizeof(value) - 1) - i);
		*dst_local = priv_h2a((tmp & 0xF0) >> 4);
		dst_local++;
		*dst_local = priv_h2a(tmp & 0x0F);
		dst_local++;
#else
		tmp = *(((u8 *) &value) + i);
		*dst_local = priv_h2a((tmp & 0xF0) >> 4);
		dst_local++;
		*dst_local = priv_h2a(tmp & 0x0F);
		dst_local++;
#endif
	}

	/*  NULL terminate */
	*dst_local = 0;
}

/*
 * Function:	priv_tramp_string_create
 * Description: Create a new string specific to the trampoline loading and add
 *	  it to the trampoline string list.  This list contains the
 *	  trampoline section name and trampoline point symbols.
 */
static struct tramp_string *priv_tramp_string_create(struct dload_state *dlthis,
						     u32