loader_config.h

#ifndef LOADER_CONFIG_H_
#define LOADER_CONFIG_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#ifndef DOX

#if 0
#define LOADER_FD_T FILE *
#define LOADER_OPEN_FOR_RD(path) fopen(path, "rb")
#define LOADER_FD_VALID(fd) (fd != NULL)
#define LOADER_READ(fd, buffer, size) fread(buffer, 1, size, fd)
#define LOADER_WRITE(fd, buffer, size) fwrite(buffer, 1, size, fd)
#define LOADER_CLOSE(fd) fclose(fd)
#define LOADER_SEEK_FROM_START(fd, off) fseek(fd, off, SEEK_SET)
#define LOADER_TELL(fd) ftell(fd)
#else
#define LOADER_FD_T int
#define LOADER_OPEN_FOR_RD(path) open(path, O_RDONLY)
#define LOADER_FD_VALID(fd) (fd != -1)
#define LOADER_READ(fd, buffer, size) read(fd, buffer, size)
#define LOADER_WRITE(fd, buffer, size) write(fd, buffer, size)
#define LOADER_CLOSE(fd) close(fd)
#define LOADER_SEEK_FROM_START(fd, off) (lseek(fd, off, SEEK_SET) == -1)
#define LOADER_TELL(fd) lseek(fd, 0, SEEK_CUR)
#endif

#if 0
#define LOADER_ALIGN_ALLOC(size, align, perm) ((void*) memalign(align, size))
#else

extern void *do_alloc(size_t size, size_t align, ELFSecPerm_t perm);

#define LOADER_ALIGN_ALLOC(size, align, perm) do_alloc(size, align, perm)

#endif

#define LOADER_FREE(ptr) free(ptr)
#define LOADER_CLEAR(ptr, size) memset(ptr, 0, size)
#define LOADER_STREQ(s1, s2) (strcmp(s1, s2) == 0)

#if 0
#define LOADER_JUMP_TO(entry) entry();
#else

extern void arch_jumpTo(entry_t entry);

#define LOADER_JUMP_TO(entry) arch_jumpTo(entry)

#endif

#define DBG(...) printf("ELF: " __VA_ARGS__)
#define ERR(msg) do { perror("ELF: " msg); __asm__ volatile ("bkpt"); } while(0)
#define MSG(msg) puts("ELF: " msg)

#else

/**
 * @defgroup Configuration Configuration macros
 *
 * This macros defines the access function to various internal function of
 * elf loader
 *
 * You need to define this macros to compile and use the elf loader library
 * in your system
 *
 * @{
 */

/**
 * File handler descriptor type macro
 *
 * This define the file handler declaration type
 */
#define LOADER_FD_T

/**
 * Open for read function macro
 *
 * This macro define the function name and convention call to open file for
 * read. This need to return #LOADER_FD_T type
 *
 * @param path Path to file for open
 */
#define LOADER_OPEN_FOR_RD(path)

/**
 * Macro for check file descriptor validity
 *
 * This macro is used for check the validity of #LOADER_FD_T after open
 * operation
 *
 * @param fd File descriptor object
 * @retval Zero if fd is unusable
 * @retval Non-zero if fd is usable
 */
#define LOADER_FD_VALID(fd)

/**
 * Macro for read buffer from file
 *
 * This macro is used when need read a block for the #LOADER_FD_T previous
 * opened.
 * @param fd File descriptor
 * @param buffer Writable buffer to store read data
 * @param size Number of bytes to read
 */
#define LOADER_READ(fd, buffer, size)

/**
 * Close file macro
 *
 * Close a file descriptor previously opened with LOADER_OPEN_FOR_RD
 *
 * @param fd File descriptor to close
 */
#define LOADER_CLOSE(fd)

/**
 * Seek read cursor of file
 *
 * Seek read cursor from begin of file
 *
 * @param fd File descriptor
 * @param off Offset from begin of file
 */
#define LOADER_SEEK_FROM_START(fd, off)

/**
 * Tell cursor of file
 *
 * Tell current read cursor of file
 *
 * @param fd File descriptor
 * @return The current read cursor position
 */
#define LOADER_TELL(fd)

/**
 * Allocate memory service
 *
 * Allocate aligned memory with required right access
 *
 * @param size Size in bytes to allocate
 * @param align Aligned size in bytes
 * @param perm Access rights of allocated block. Mask of #ELFSecPerm_t values
 * @return Void pointer to allocated memory or NULL on fail
 */
#define LOADER_ALIGN_ALLOC(size, align, perm)

/**
 * Free memory
 *
 * Free memory allocated with #LOADER_ALIGN_ALLOC
 *
 * @param ptr Pointer to allocated memory to free
 */
#define LOADER_FREE(ptr)

/**
 * Clear memory block
 *
 * Set to zero memory block
 *
 * @param ptr Pointer to memory
 * @param size Bytes to clear
 */
#define LOADER_CLEAR(ptr, size)

/**
 * Compare string
 *
 * Compare zero terminated C-strings
 *
 * @param s1 First string
 * @param s2 Second string
 * @retval Zero if non equals
 * @retval Non-zero if s1==s2
 */
#define LOADER_STREQ(s1, s2)

/**
 * Jump to code
 *
 * Execute loaded code from entry point
 *
 * @param entry Pointer to function code to execute
 */
#define LOADER_JUMP_TO(entry)

/**
 * Debug macro
 *
 * This macro is used for trace code execution and not side effect is needed
 *
 * @param ... printf style format and variadic argument list
 */
#define DBG(...)

/**
 * Error macro
 *
 * This macro is used on unrecoverable error message
 *
 * @param msg C string printable text
 */
#define ERR(msg)

/**
 * Information/Warnings message macro
 *
 * This macro is used on information or recoverable warnings mesages
 *
 * @param msg C string printable text
 */
#define MSG(msg)

/** @} */

#endif

#endif /* LOADER_CONFIG_H_ */