1 /* 2 * Routines for target instruction 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 "disas-internal.h" 10 11 12 void target_disas(FILE *out, CPUState *cpu, uint64_t code, size_t size) 13 { 14 uint64_t pc; 15 int count; 16 CPUDebug s; 17 18 disas_initialize_debug_target(&s, cpu); 19 s.info.fprintf_func = fprintf; 20 s.info.stream = out; 21 s.info.buffer_vma = code; 22 s.info.buffer_length = size; 23 s.info.show_opcodes = true; 24 25 if (s.info.cap_arch >= 0 && cap_disas_target(&s.info, code, size)) { 26 return; 27 } 28 29 if (s.info.print_insn == NULL) { 30 s.info.print_insn = print_insn_od_target; 31 } 32 33 for (pc = code; size > 0; pc += count, size -= count) { 34 fprintf(out, "0x%08" PRIx64 ": ", pc); 35 count = s.info.print_insn(pc, &s.info); 36 fprintf(out, "\n"); 37 if (count < 0) { 38 break; 39 } 40 if (size < count) { 41 fprintf(out, 42 "Disassembler disagrees with translator over instruction " 43 "decoding\n" 44 "Please report this to qemu-devel@nongnu.org\n"); 45 break; 46 } 47 } 48 } 49 50 #ifdef CONFIG_PLUGIN 51 static void plugin_print_address(bfd_vma addr, struct disassemble_info *info) 52 { 53 /* does nothing */ 54 } 55 56 /* 57 * We should only be dissembling one instruction at a time here. If 58 * there is left over it usually indicates the front end has read more 59 * bytes than it needed. 60 */ 61 char *plugin_disas(CPUState *cpu, uint64_t addr, size_t size) 62 { 63 CPUDebug s; 64 GString *ds = g_string_new(NULL); 65 66 disas_initialize_debug_target(&s, cpu); 67 s.info.fprintf_func = disas_gstring_printf; 68 s.info.stream = (FILE *)ds; /* abuse this slot */ 69 s.info.buffer_vma = addr; 70 s.info.buffer_length = size; 71 s.info.print_address_func = plugin_print_address; 72 73 if (s.info.cap_arch >= 0 && cap_disas_plugin(&s.info, addr, size)) { 74 ; /* done */ 75 } else if (s.info.print_insn) { 76 s.info.print_insn(addr, &s.info); 77 } else { 78 ; /* cannot disassemble -- return empty string */ 79 } 80 81 /* Return the buffer, freeing the GString container. */ 82 return g_string_free(ds, false); 83 } 84 #endif /* CONFIG_PLUGIN */ 85