| 1 | /* |
| 2 | * Common routines for disassembly. |
| 3 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 4 | */ |
| 5 | |
| 6 | #include "qemu/osdep.h" |
| 7 | #include "disas/disas.h" |
| 8 | #include "disas/capstone.h" |
| 9 | #include "hw/core/cpu.h" |
| 10 | #include "disas-internal.h" |
| 11 | |
| 12 | |
| 13 | /* Filled in by elfload.c. Simplistic, but will do for now. */ |
| 14 | struct syminfo *syminfos = NULL; |
| 15 | |
| 16 | /* |
| 17 | * Print an error message. We can assume that this is in response to |
| 18 | * an error return from {host,target}_read_memory. |
| 19 | */ |
| 20 | static void perror_memory(int status, bfd_vma memaddr, |
| 21 | struct disassemble_info *info) |
| 22 | { |
| 23 | if (status != EIO) { |
| 24 | /* Can't happen. */ |
| 25 | info->fprintf_func(info->stream, "Unknown error %d\n", status); |
| 26 | } else { |
| 27 | /* Address between memaddr and memaddr + len was out of bounds. */ |
| 28 | info->fprintf_func(info->stream, |
| 29 | "Address 0x%" PRIx64 " is out of bounds.\n", |
| 30 | memaddr); |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | /* Print address in hex. */ |
| 35 | static void print_address(bfd_vma addr, struct disassemble_info *info) |
| 36 | { |
| 37 | info->fprintf_func(info->stream, "0x%" PRIx64, addr); |
| 38 | } |
| 39 | |
| 40 | /* Stub prevents some fruitless earching in optabs disassemblers. */ |
| 41 | static int symbol_at_address(bfd_vma addr, struct disassemble_info *info) |
| 42 | { |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | void disas_initialize_debug(CPUDebug *s) |
| 47 | { |
| 48 | memset(s, 0, sizeof(*s)); |
| 49 | s->info.arch = bfd_arch_unknown; |
| 50 | s->info.cap_arch = -1; |
| 51 | s->info.cap_insn_unit = 4; |
| 52 | s->info.cap_insn_split = 4; |
| 53 | s->info.memory_error_func = perror_memory; |
| 54 | s->info.symbol_at_address_func = symbol_at_address; |
| 55 | } |
| 56 | |
| 57 | void disas_initialize_debug_target(CPUDebug *s, CPUState *cpu) |
| 58 | { |
| 59 | disas_initialize_debug(s); |
| 60 | |
| 61 | s->cpu = cpu; |
| 62 | s->info.print_address_func = print_address; |
| 63 | s->info.endian = BFD_ENDIAN_UNKNOWN; |
| 64 | |
| 65 | if (cpu->cc->disas_set_info) { |
| 66 | cpu->cc->disas_set_info(cpu, &s->info); |
| 67 | g_assert(s->info.endian != BFD_ENDIAN_UNKNOWN); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | int disas_gstring_printf(FILE *stream, const char *fmt, ...) |
| 72 | { |
| 73 | /* We abuse the FILE parameter to pass a GString. */ |
| 74 | GString *s = (GString *)stream; |
| 75 | int initial_len = s->len; |
| 76 | va_list va; |
| 77 | |
| 78 | va_start(va, fmt); |
| 79 | g_string_append_vprintf(s, fmt, va); |
| 80 | va_end(va); |
| 81 | |
| 82 | return s->len - initial_len; |
| 83 | } |
| 84 | |
| 85 | /* Look up symbol for debugging purpose. Returns "" if unknown. */ |
| 86 | const char *lookup_symbol(uint64_t orig_addr) |
| 87 | { |
| 88 | const char *symbol = ""; |
| 89 | struct syminfo *s; |
| 90 | |
| 91 | for (s = syminfos; s; s = s->next) { |
| 92 | symbol = s->lookup_symbol(s, orig_addr); |
| 93 | if (symbol[0] != '\0') { |
| 94 | break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | return symbol; |
| 99 | } |