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/*
* Routines for target instruction disassembly.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "disas/disas.h"
#include "disas/capstone.h"
#include "exec/translator.h"
#include "disas-internal.h"
static int translator_read_memory(bfd_vma memaddr, bfd_byte *myaddr,
int length, struct disassemble_info *info)
{
const DisasContextBase *db = info->application_data;
return translator_st(db, myaddr, memaddr, length) ? 0 : EIO;
}
void target_disas(FILE *out, CPUState *cpu, const struct DisasContextBase *db)
{
uint64_t code = db->pc_first;
size_t size = translator_st_len(db);
uint64_t pc;
int count;
CPUDebug s;
disas_initialize_debug_target(&s, cpu);
s.info.read_memory_func = translator_read_memory;
s.info.application_data = (void *)db;
s.info.fprintf_func = fprintf;
s.info.stream = out;
s.info.buffer_vma = code;
s.info.buffer_length = size;
s.info.show_opcodes = true;
if (s.info.cap_arch >= 0 && cap_disas_target(&s.info, code, size)) {
return;
}
if (s.info.print_insn == NULL) {
s.info.print_insn = print_insn_od_target;
}
for (pc = code; size > 0; pc += count, size -= count) {
fprintf(out, "0x%08" PRIx64 ": ", pc);
count = s.info.print_insn(pc, &s.info);
fprintf(out, "\n");
if (count < 0) {
break;
}
if (size < count) {
fprintf(out,
"Disassembler disagrees with translator over instruction "
"decoding\n"
"Please report this to qemu-devel@nongnu.org\n");
break;
}
}
}
#ifdef CONFIG_PLUGIN
static void plugin_print_address(bfd_vma addr, struct disassemble_info *info)
{
/* does nothing */
}
/*
* We should only be dissembling one instruction at a time here. If
* there is left over it usually indicates the front end has read more
* bytes than it needed.
*/
char *plugin_disas(CPUState *cpu, const DisasContextBase *db,
uint64_t addr, size_t size)
{
CPUDebug s;
GString *ds = g_string_new(NULL);
disas_initialize_debug_target(&s, cpu);
s.info.read_memory_func = translator_read_memory;
s.info.application_data = (void *)db;
s.info.fprintf_func = disas_gstring_printf;
s.info.stream = (FILE *)ds; /* abuse this slot */
s.info.buffer_vma = addr;
s.info.buffer_length = size;
s.info.print_address_func = plugin_print_address;
if (s.info.cap_arch >= 0 && cap_disas_plugin(&s.info, addr, size)) {
; /* done */
} else if (s.info.print_insn) {
s.info.print_insn(addr, &s.info);
} else {
; /* cannot disassemble -- return empty string */
}
/* Return the buffer, freeing the GString container. */
return g_string_free(ds, false);
}
#endif /* CONFIG_PLUGIN */
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