hw/avr/boot.c

   1 /*
   2  * AVR loader helpers
   3  *
   4  * Copyright (c) 2019-2020 Philippe Mathieu-Daudé
   5  *
   6  * This work is licensed under the terms of the GNU GPLv2 or later.
   7  * See the COPYING file in the top-level directory.
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qemu-common.h"
  13 #include "qemu/datadir.h"
  14 #include "hw/loader.h"
  15 #include "elf.h"
  16 #include "boot.h"
  17 #include "qemu/error-report.h"
  18
  19 static const char *avr_elf_e_flags_to_cpu_type(uint32_t flags)
  20 {
  21     switch (flags & EF_AVR_MACH) {
  22     case bfd_mach_avr1:
  23         return AVR_CPU_TYPE_NAME("avr1");
  24     case bfd_mach_avr2:
  25         return AVR_CPU_TYPE_NAME("avr2");
  26     case bfd_mach_avr25:
  27         return AVR_CPU_TYPE_NAME("avr25");
  28     case bfd_mach_avr3:
  29         return AVR_CPU_TYPE_NAME("avr3");
  30     case bfd_mach_avr31:
  31         return AVR_CPU_TYPE_NAME("avr31");
  32     case bfd_mach_avr35:
  33         return AVR_CPU_TYPE_NAME("avr35");
  34     case bfd_mach_avr4:
  35         return AVR_CPU_TYPE_NAME("avr4");
  36     case bfd_mach_avr5:
  37         return AVR_CPU_TYPE_NAME("avr5");
  38     case bfd_mach_avr51:
  39         return AVR_CPU_TYPE_NAME("avr51");
  40     case bfd_mach_avr6:
  41         return AVR_CPU_TYPE_NAME("avr6");
  42     case bfd_mach_avrtiny:
  43         return AVR_CPU_TYPE_NAME("avrtiny");
  44     case bfd_mach_avrxmega2:
  45         return AVR_CPU_TYPE_NAME("xmega2");
  46     case bfd_mach_avrxmega3:
  47         return AVR_CPU_TYPE_NAME("xmega3");
  48     case bfd_mach_avrxmega4:
  49         return AVR_CPU_TYPE_NAME("xmega4");
  50     case bfd_mach_avrxmega5:
  51         return AVR_CPU_TYPE_NAME("xmega5");
  52     case bfd_mach_avrxmega6:
  53         return AVR_CPU_TYPE_NAME("xmega6");
  54     case bfd_mach_avrxmega7:
  55         return AVR_CPU_TYPE_NAME("xmega7");
  56     default:
  57         return NULL;
  58     }
  59 }
  60
  61 bool avr_load_firmware(AVRCPU *cpu, MachineState *ms,
  62                        MemoryRegion *program_mr, const char *firmware)
  63 {
  64     g_autofree char *filename = NULL;
  65     int bytes_loaded;
  66     uint64_t entry;
  67     uint32_t e_flags;
  68
  69     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware);
  70     if (filename == NULL) {
  71         error_report("Unable to find %s", firmware);
  72         return false;
  73     }
  74
  75     bytes_loaded = load_elf_ram_sym(filename,
  76                                     NULL, NULL, NULL,
  77                                     &entry, NULL, NULL,
  78                                     &e_flags, 0, EM_AVR, 0, 0,
  79                                     NULL, true, NULL);
  80     if (bytes_loaded >= 0) {
  81         /* If ELF file is provided, determine CPU type reading ELF e_flags. */
  82         const char *elf_cpu = avr_elf_e_flags_to_cpu_type(e_flags);
  83         const char *mcu_cpu_type = object_get_typename(OBJECT(cpu));
  84         int cpu_len = strlen(mcu_cpu_type) - strlen(AVR_CPU_TYPE_SUFFIX);
  85
  86         if (entry) {
  87             error_report("BIOS entry_point must be 0x0000 "
  88                          "(ELF image '%s' has entry_point 0x%04" PRIx64 ")",
  89                          firmware, entry);
  90             return false;
  91         }
  92         if (!elf_cpu) {
  93             warn_report("Could not determine CPU type for ELF image '%s', "
  94                         "assuming '%.*s' CPU",
  95                          firmware, cpu_len, mcu_cpu_type);
  96             return true;
  97         }
  98         if (strcmp(elf_cpu, mcu_cpu_type)) {
  99             error_report("Current machine: %s with '%.*s' CPU",
 100                          MACHINE_GET_CLASS(ms)->desc, cpu_len, mcu_cpu_type);
 101             error_report("ELF image '%s' is for '%.*s' CPU",
 102                          firmware,
 103                          (int)(strlen(elf_cpu) - strlen(AVR_CPU_TYPE_SUFFIX)),
 104                          elf_cpu);
 105             return false;
 106         }
 107     } else {
 108         bytes_loaded = load_image_mr(filename, program_mr);
 109     }
 110     if (bytes_loaded < 0) {
 111         error_report("Unable to load firmware image %s as ELF or raw binary",
 112                      firmware);
 113         return false;
 114     }
 115     return true;
 116 }