4c833c60e0
Read from already translated pages, or saved mmio data. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* Routines for target instruction disassembly.
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "disas/disas.h"
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#include "disas/capstone.h"
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#include "exec/translator.h"
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#include "disas-internal.h"
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static int translator_read_memory(bfd_vma memaddr, bfd_byte *myaddr,
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int length, struct disassemble_info *info)
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{
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const DisasContextBase *db = info->application_data;
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return translator_st(db, myaddr, memaddr, length) ? 0 : EIO;
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}
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void target_disas(FILE *out, CPUState *cpu, const struct DisasContextBase *db)
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{
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uint64_t code = db->pc_first;
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size_t size = translator_st_len(db);
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uint64_t pc;
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int count;
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CPUDebug s;
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disas_initialize_debug_target(&s, cpu);
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s.info.read_memory_func = translator_read_memory;
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s.info.application_data = (void *)db;
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s.info.fprintf_func = fprintf;
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s.info.stream = out;
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s.info.buffer_vma = code;
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s.info.buffer_length = size;
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s.info.show_opcodes = true;
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if (s.info.cap_arch >= 0 && cap_disas_target(&s.info, code, size)) {
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return;
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}
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if (s.info.print_insn == NULL) {
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s.info.print_insn = print_insn_od_target;
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}
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for (pc = code; size > 0; pc += count, size -= count) {
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fprintf(out, "0x%08" PRIx64 ": ", pc);
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count = s.info.print_insn(pc, &s.info);
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fprintf(out, "\n");
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if (count < 0) {
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break;
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}
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if (size < count) {
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fprintf(out,
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"Disassembler disagrees with translator over instruction "
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"decoding\n"
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"Please report this to qemu-devel@nongnu.org\n");
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break;
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}
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}
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}
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#ifdef CONFIG_PLUGIN
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static void plugin_print_address(bfd_vma addr, struct disassemble_info *info)
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{
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/* does nothing */
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}
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/*
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* We should only be dissembling one instruction at a time here. If
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* there is left over it usually indicates the front end has read more
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* bytes than it needed.
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*/
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char *plugin_disas(CPUState *cpu, const DisasContextBase *db,
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uint64_t addr, size_t size)
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{
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CPUDebug s;
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GString *ds = g_string_new(NULL);
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disas_initialize_debug_target(&s, cpu);
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s.info.read_memory_func = translator_read_memory;
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s.info.application_data = (void *)db;
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s.info.fprintf_func = disas_gstring_printf;
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s.info.stream = (FILE *)ds; /* abuse this slot */
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s.info.buffer_vma = addr;
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s.info.buffer_length = size;
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s.info.print_address_func = plugin_print_address;
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if (s.info.cap_arch >= 0 && cap_disas_plugin(&s.info, addr, size)) {
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; /* done */
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} else if (s.info.print_insn) {
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s.info.print_insn(addr, &s.info);
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} else {
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; /* cannot disassemble -- return empty string */
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}
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/* Return the buffer, freeing the GString container. */
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return g_string_free(ds, false);
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}
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#endif /* CONFIG_PLUGIN */
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