1 /*
2 * Functions related to disassembly from the monitor
3 *
4 * SPDX-License-Identifier: GPL-2.0-or-later
5 */
6
7 #include "qemu/osdep.h"
8 #include "disas-internal.h"
9 #include "disas/disas.h"
10 #include "exec/memory.h"
11 #include "hw/core/cpu.h"
12 #include "monitor/monitor.h"
13
14 /*
15 * Get LENGTH bytes from info's buffer, at target address memaddr.
16 * Transfer them to myaddr.
17 */
18 static int
virtual_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)19 virtual_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
20 struct disassemble_info *info)
21 {
22 CPUDebug *s = container_of(info, CPUDebug, info);
23 int r = cpu_memory_rw_debug(s->cpu, memaddr, myaddr, length, 0);
24 return r ? EIO : 0;
25 }
26
27 static int
physical_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)28 physical_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
29 struct disassemble_info *info)
30 {
31 CPUDebug *s = container_of(info, CPUDebug, info);
32 MemTxResult res;
33
34 res = address_space_read(s->cpu->as, memaddr, MEMTXATTRS_UNSPECIFIED,
35 myaddr, length);
36 return res == MEMTX_OK ? 0 : EIO;
37 }
38
39 /* Disassembler for the monitor. */
monitor_disas(Monitor * mon,CPUState * cpu,uint64_t pc,int nb_insn,bool is_physical)40 void monitor_disas(Monitor *mon, CPUState *cpu, uint64_t pc,
41 int nb_insn, bool is_physical)
42 {
43 int count, i;
44 CPUDebug s;
45 g_autoptr(GString) ds = g_string_new("");
46
47 disas_initialize_debug_target(&s, cpu);
48 s.info.fprintf_func = disas_gstring_printf;
49 s.info.stream = (FILE *)ds; /* abuse this slot */
50 s.info.show_opcodes = true;
51
52 if (is_physical) {
53 s.info.read_memory_func = physical_read_memory;
54 } else {
55 s.info.read_memory_func = virtual_read_memory;
56 }
57 s.info.buffer_vma = pc;
58
59 if (s.info.cap_arch >= 0 && cap_disas_monitor(&s.info, pc, nb_insn)) {
60 monitor_puts(mon, ds->str);
61 return;
62 }
63
64 if (!s.info.print_insn) {
65 monitor_printf(mon, "0x%08" PRIx64
66 ": Asm output not supported on this arch\n", pc);
67 return;
68 }
69
70 for (i = 0; i < nb_insn; i++) {
71 g_string_append_printf(ds, "0x%08" PRIx64 ": ", pc);
72 count = s.info.print_insn(pc, &s.info);
73 g_string_append_c(ds, '\n');
74 if (count < 0) {
75 break;
76 }
77 pc += count;
78 }
79
80 monitor_puts(mon, ds->str);
81 }
82