cregit-Linux how code gets into the kernel

Release 4.13 firmware/ihex2fw.c

Directory: firmware
/*
 * Parser/loader for IHEX formatted data.
 *
 * Copyright © 2008 David Woodhouse <dwmw2@infradead.org>
 * Copyright © 2005 Jan Harkes <jaharkes@cs.cmu.edu>
 *
 * This program 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.
 */

#include <stdint.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

#define _GNU_SOURCE
#include <getopt.h>



struct ihex_binrec {
	
struct ihex_binrec *next; /* not part of the real data structure */
        
uint32_t addr;
        
uint16_t len;
        
uint8_t data[];
};

/**
 * nybble/hex are little helpers to parse hexadecimal numbers to a byte value
 **/

static uint8_t nybble(const uint8_t n) { if (n >= '0' && n <= '9') return n - '0'; else if (n >= 'A' && n <= 'F') return n - ('A' - 10); else if (n >= 'a' && n <= 'f') return n - ('a' - 10); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse68100.00%1100.00%
Total68100.00%1100.00%


static uint8_t hex(const uint8_t *data, uint8_t *crc) { uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]); *crc += val; return val; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse46100.00%1100.00%
Total46100.00%1100.00%

static int process_ihex(uint8_t *data, ssize_t size); static void file_record(struct ihex_binrec *record); static int output_records(int outfd); static int sort_records = 0; static int wide_records = 0; static int include_jump = 0;
static int usage(void) { fprintf(stderr, "ihex2fw: Convert ihex files into binary " "representation for use by Linux kernel\n"); fprintf(stderr, "usage: ihex2fw [<options>] <src.HEX> <dst.fw>\n"); fprintf(stderr, " -w: wide records (16-bit length)\n"); fprintf(stderr, " -s: sort records by address\n"); fprintf(stderr, " -j: include records for CS:IP/EIP address\n"); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse3982.98%133.33%
Mark Brown714.89%133.33%
Ladinu Chandrasinghe12.13%133.33%
Total47100.00%3100.00%


int main(int argc, char **argv) { int infd, outfd; struct stat st; uint8_t *data; int opt; while ((opt = getopt(argc, argv, "wsj")) != -1) { switch (opt) { case 'w': wide_records = 1; break; case 's': sort_records = 1; break; case 'j': include_jump = 1; break; default: return usage(); } } if (optind + 2 != argc) return usage(); if (!strcmp(argv[optind], "-")) infd = 0; else infd = open(argv[optind], O_RDONLY); if (infd == -1) { fprintf(stderr, "Failed to open source file: %s", strerror(errno)); return usage(); } if (fstat(infd, &st)) { perror("stat"); return 1; } data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0); if (data == MAP_FAILED) { perror("mmap"); return 1; } if (!strcmp(argv[optind+1], "-")) outfd = 1; else outfd = open(argv[optind+1], O_TRUNC|O_CREAT|O_WRONLY, 0644); if (outfd == -1) { fprintf(stderr, "Failed to open destination file: %s", strerror(errno)); return usage(); } if (process_ihex(data, st.st_size)) return 1; return output_records(outfd); }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse28096.22%240.00%
Mark Brown93.09%120.00%
Nicolas Iooss10.34%120.00%
Chris Ruffin10.34%120.00%
Total291100.00%5100.00%


static int process_ihex(uint8_t *data, ssize_t size) { struct ihex_binrec *record; uint32_t offset = 0; uint32_t data32; uint8_t type, crc = 0, crcbyte = 0; int i, j; int line = 1; int len; i = 0; next_record: /* search for the start of record character */ while (i < size) { if (data[i] == '\n') line++; if (data[i++] == ':') break; } /* Minimum record length would be about 10 characters */ if (i + 10 > size) { fprintf(stderr, "Can't find valid record at line %d\n", line); return -EINVAL; } len = hex(data + i, &crc); i += 2; if (wide_records) { len <<= 8; len += hex(data + i, &crc); i += 2; } record = malloc((sizeof (*record) + len + 3) & ~3); if (!record) { fprintf(stderr, "out of memory for records\n"); return -ENOMEM; } memset(record, 0, (sizeof(*record) + len + 3) & ~3); record->len = len; /* now check if we have enough data to read everything */ if (i + 8 + (record->len * 2) > size) { fprintf(stderr, "Not enough data to read complete record at line %d\n", line); return -EINVAL; } record->addr = hex(data + i, &crc) << 8; i += 2; record->addr |= hex(data + i, &crc); i += 2; type = hex(data + i, &crc); i += 2; for (j = 0; j < record->len; j++, i += 2) record->data[j] = hex(data + i, &crc); /* check CRC */ crcbyte = hex(data + i, &crc); i += 2; if (crc != 0) { fprintf(stderr, "CRC failure at line %d: got 0x%X, expected 0x%X\n", line, crcbyte, (unsigned char)(crcbyte-crc)); return -EINVAL; } /* Done reading the record */ switch (type) { case 0: /* old style EOF record? */ if (!record->len) break; record->addr += offset; file_record(record); goto next_record; case 1: /* End-Of-File Record */ if (record->addr || record->len) { fprintf(stderr, "Bad EOF record (type 01) format at line %d", line); return -EINVAL; } break; case 2: /* Extended Segment Address Record (HEX86) */ case 4: /* Extended Linear Address Record (HEX386) */ if (record->addr || record->len != 2) { fprintf(stderr, "Bad HEX86/HEX386 record (type %02X) at line %d\n", type, line); return -EINVAL; } /* We shouldn't really be using the offset for HEX86 because * the wraparound case is specified quite differently. */ offset = record->data[0] << 8 | record->data[1]; offset <<= (type == 2 ? 4 : 16); goto next_record; case 3: /* Start Segment Address Record */ case 5: /* Start Linear Address Record */ if (record->addr || record->len != 4) { fprintf(stderr, "Bad Start Address record (type %02X) at line %d\n", type, line); return -EINVAL; } memcpy(&data32, &record->data[0], sizeof(data32)); data32 = htonl(data32); memcpy(&record->data[0], &data32, sizeof(data32)); /* These records contain the CS/IP or EIP where execution * starts. If requested output this as a record. */ if (include_jump) file_record(record); goto next_record; default: fprintf(stderr, "Unknown record (type %02X)\n", type); return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse58090.91%266.67%
Mark Brown589.09%133.33%
Total638100.00%3100.00%

static struct ihex_binrec *records;
static void file_record(struct ihex_binrec *record) { struct ihex_binrec **p = &records; while ((*p) && (!sort_records || (*p)->addr < record->addr)) p = &((*p)->next); record->next = *p; *p = record; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse67100.00%1100.00%
Total67100.00%1100.00%


static int output_records(int outfd) { unsigned char zeroes[6] = {0, 0, 0, 0, 0, 0}; struct ihex_binrec *p = records; while (p) { uint16_t writelen = (p->len + 9) & ~3; p->addr = htonl(p->addr); p->len = htons(p->len); if (write(outfd, &p->addr, writelen) != writelen) return 1; p = p->next; } /* EOF record is zero length, since we don't bother to represent the type field in the binary version */ if (write(outfd, zeroes, 6) != 6) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse10383.06%133.33%
Chris Ruffin1612.90%133.33%
Marc Zyngier54.03%133.33%
Total124100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
David Woodhouse129392.56%228.57%
Mark Brown805.73%114.29%
Chris Ruffin171.22%114.29%
Marc Zyngier50.36%114.29%
Ladinu Chandrasinghe10.07%114.29%
Nicolas Iooss10.07%114.29%
Total1397100.00%7100.00%
Directory: firmware
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