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loader.h
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loader.h
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/* loader.h - program loader interfaces */
/* SimpleScalar(TM) Tool Suite
* Copyright (C) 1994-2003 by Todd M. Austin, Ph.D. and SimpleScalar, LLC.
* All Rights Reserved.
*
* THIS IS A LEGAL DOCUMENT, BY USING SIMPLESCALAR,
* YOU ARE AGREEING TO THESE TERMS AND CONDITIONS.
*
* No portion of this work may be used by any commercial entity, or for any
* commercial purpose, without the prior, written permission of SimpleScalar,
* LLC (info@simplescalar.com). Nonprofit and noncommercial use is permitted
* as described below.
*
* 1. SimpleScalar is provided AS IS, with no warranty of any kind, express
* or implied. The user of the program accepts full responsibility for the
* application of the program and the use of any results.
*
* 2. Nonprofit and noncommercial use is encouraged. SimpleScalar may be
* downloaded, compiled, executed, copied, and modified solely for nonprofit,
* educational, noncommercial research, and noncommercial scholarship
* purposes provided that this notice in its entirety accompanies all copies.
* Copies of the modified software can be delivered to persons who use it
* solely for nonprofit, educational, noncommercial research, and
* noncommercial scholarship purposes provided that this notice in its
* entirety accompanies all copies.
*
* 3. ALL COMMERCIAL USE, AND ALL USE BY FOR PROFIT ENTITIES, IS EXPRESSLY
* PROHIBITED WITHOUT A LICENSE FROM SIMPLESCALAR, LLC (info@simplescalar.com).
*
* 4. No nonprofit user may place any restrictions on the use of this software,
* including as modified by the user, by any other authorized user.
*
* 5. Noncommercial and nonprofit users may distribute copies of SimpleScalar
* in compiled or executable form as set forth in Section 2, provided that
* either: (A) it is accompanied by the corresponding machine-readable source
* code, or (B) it is accompanied by a written offer, with no time limit, to
* give anyone a machine-readable copy of the corresponding source code in
* return for reimbursement of the cost of distribution. This written offer
* must permit verbatim duplication by anyone, or (C) it is distributed by
* someone who received only the executable form, and is accompanied by a
* copy of the written offer of source code.
*
* 6. SimpleScalar was developed by Todd M. Austin, Ph.D. The tool suite is
* currently maintained by SimpleScalar LLC (info@simplescalar.com). US Mail:
* 2395 Timbercrest Court, Ann Arbor, MI 48105.
*
* Copyright (C) 1994-2003 by Todd M. Austin, Ph.D. and SimpleScalar, LLC.
*/
#ifndef LOADER_H
#define LOADER_H
#include <stdio.h>
#include "host.h"
#include "misc.h"
#include "machine.h"
#include "regs.h"
#include "memory.h"
/*
* This module implements program loading. The program text (code) and
* initialized data are first read from the program executable. Next, the
* program uninitialized data segment is initialized to all zero's. Finally,
* the program stack is initialized with command line arguments and
* environment variables. The format of the top of stack when the program
* starts execution is as follows:
*
* 0x7fffffff +----------+
* | unused |
* 0x7fffc000 +----------+
* | envp |
* | strings |
* +----------+
* | argv |
* | strings |
* +----------+
* | envp |
* | array |
* +----------+
* | argv |
* | array |
* +----------+
* | argc |
* regs_R[29] +----------+
* (stack ptr)
*
* NOTE: the start of envp is computed in crt0.o (C startup code) using the
* value of argc and the computed size of the argv array, the envp array size
* is not specified, but rather it is NULL terminated, so the startup code
* has to scan memory for the end of the string.
*/
/*
* program segment ranges, valid after calling ld_load_prog()
*/
/* program text (code) segment base */
extern md_addr_t ld_text_base;
/* program text (code) size in bytes */
extern unsigned int ld_text_size;
/* program initialized data segment base */
extern md_addr_t ld_data_base;
/* program initialized ".data" and uninitialized ".bss" size in bytes */
extern unsigned int ld_data_size;
/* top of the data segment */
extern md_addr_t ld_brk_point;
/* program stack segment base (highest address in stack) */
extern md_addr_t ld_stack_base;
/* program initial stack size */
extern unsigned int ld_stack_size;
/* lowest address accessed on the stack */
extern md_addr_t ld_stack_min;
/* program file name */
extern char *ld_prog_fname;
/* program entry point (initial PC) */
extern md_addr_t ld_prog_entry;
/* program environment base address address */
extern md_addr_t ld_environ_base;
/* target executable endian-ness, non-zero if big endian */
extern int ld_target_big_endian;
/* register simulator-specific statistics */
void
ld_reg_stats(struct stat_sdb_t *sdb); /* stats data base */
/* load program text and initialized data into simulated virtual memory
space and initialize program segment range variables */
void
ld_load_prog(char *fname, /* program to load */
int argc, char **argv, /* simulated program cmd line args */
char **envp, /* simulated program environment */
struct regs_t *regs, /* registers to initialize for load */
struct mem_t *mem, /* memory space to load prog into */
int zero_bss_segs); /* zero uninit data segment? */
#endif /* LOADER_H */