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