disas: Use translator_st to get disassembly data

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>

accel/tcg/translator.c

@@ -231,7 +231,7 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
             if (!ops->disas_log ||
                 !ops->disas_log(db, cpu, logfile)) {
                 fprintf(logfile, "IN: %s\n", lookup_symbol(db->pc_first));
-                target_disas(logfile, cpu, db->pc_first, db->tb->size);
+                target_disas(logfile, cpu, db);
             }
             fprintf(logfile, "\n");
             qemu_log_unlock(logfile);

disas/disas-common.c

@@ -8,25 +8,12 @@
 #include "disas/capstone.h"
 #include "hw/core/cpu.h"
 #include "exec/tswap.h"
-#include "exec/memory.h"
 #include "disas-internal.h"
 
 
 /* Filled in by elfload.c.  Simplistic, but will do for now. */
 struct syminfo *syminfos = NULL;
 
-/*
- * Get LENGTH bytes from info's buffer, at target address memaddr.
- * Transfer them to myaddr.
- */
-static int target_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
-                              struct disassemble_info *info)
-{
-    CPUDebug *s = container_of(info, CPUDebug, info);
-    int r = cpu_memory_rw_debug(s->cpu, memaddr, myaddr, length, 0);
-    return r ? EIO : 0;
-}
-
 /*
  * Print an error message.  We can assume that this is in response to
  * an error return from {host,target}_read_memory.
@@ -73,7 +60,6 @@ void disas_initialize_debug_target(CPUDebug *s, CPUState *cpu)
     disas_initialize_debug(s);
 
     s->cpu = cpu;
-    s->info.read_memory_func = target_read_memory;
     s->info.print_address_func = print_address;
     if (target_words_bigendian()) {
         s->info.endian = BFD_ENDIAN_BIG;

disas/disas-mon.c

@@ -11,6 +11,19 @@
 #include "hw/core/cpu.h"
 #include "monitor/monitor.h"
 
+/*
+ * Get LENGTH bytes from info's buffer, at target address memaddr.
+ * Transfer them to myaddr.
+ */
+static int
+virtual_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
+                    struct disassemble_info *info)
+{
+    CPUDebug *s = container_of(info, CPUDebug, info);
+    int r = cpu_memory_rw_debug(s->cpu, memaddr, myaddr, length, 0);
+    return r ? EIO : 0;
+}
+
 static int
 physical_read_memory(bfd_vma memaddr, bfd_byte *myaddr, int length,
                      struct disassemble_info *info)
@@ -38,6 +51,8 @@ void monitor_disas(Monitor *mon, CPUState *cpu, uint64_t pc,
 
     if (is_physical) {
         s.info.read_memory_func = physical_read_memory;
+    } else {
+        s.info.read_memory_func = virtual_read_memory;
     }
     s.info.buffer_vma = pc;
 

disas/disas-target.c

@@ -6,16 +6,28 @@
 #include "qemu/osdep.h"
 #include "disas/disas.h"
 #include "disas/capstone.h"
+#include "exec/translator.h"
 #include "disas-internal.h"
 
 
-void target_disas(FILE *out, CPUState *cpu, uint64_t code, size_t size)
+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;
@@ -58,12 +70,15 @@ static void plugin_print_address(bfd_vma addr, struct disassemble_info *info)
  * there is left over it usually indicates the front end has read more
  * bytes than it needed.
  */
-char *plugin_disas(CPUState *cpu, uint64_t addr, size_t size)
+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;

include/disas/disas.h

@@ -4,14 +4,15 @@
 /* Disassemble this for me please... (debugging). */
 #ifdef CONFIG_TCG
 void disas(FILE *out, const void *code, size_t size);
-void target_disas(FILE *out, CPUState *cpu, uint64_t code, size_t size);
+void target_disas(FILE *out, CPUState *cpu, const DisasContextBase *db);
 #endif
 
 void monitor_disas(Monitor *mon, CPUState *cpu, uint64_t pc,
                    int nb_insn, bool is_physical);
 
 #ifdef CONFIG_PLUGIN
-char *plugin_disas(CPUState *cpu, uint64_t addr, size_t size);
+char *plugin_disas(CPUState *cpu, const DisasContextBase *db,
+                   uint64_t addr, size_t size);
 #endif
 
 /* Look up symbol for debugging purpose.  Returns "" if unknown. */

include/exec/translator.h

@@ -79,7 +79,7 @@ typedef enum DisasJumpType {
  *
  * Architecture-agnostic disassembly context.
  */
-typedef struct DisasContextBase {
+struct DisasContextBase {
     TranslationBlock *tb;
     vaddr pc_first;
     vaddr pc_next;
@@ -103,7 +103,7 @@ typedef struct DisasContextBase {
     int record_start;
     int record_len;
     uint8_t record[32];
-} DisasContextBase;
+};
 
 /**
  * TranslatorOps:

include/qemu/typedefs.h

@@ -42,6 +42,7 @@ typedef struct CPUPluginState CPUPluginState;
 typedef struct CPUState CPUState;
 typedef struct DeviceState DeviceState;
 typedef struct DirtyBitmapSnapshot DirtyBitmapSnapshot;
+typedef struct DisasContextBase DisasContextBase;
 typedef struct DisplayChangeListener DisplayChangeListener;
 typedef struct DriveInfo DriveInfo;
 typedef struct DumpState DumpState;

plugins/api.c

@@ -271,8 +271,8 @@ void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn)
 
 char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn)
 {
-    CPUState *cpu = current_cpu;
+    return plugin_disas(tcg_ctx->cpu, tcg_ctx->plugin_db,
-    return plugin_disas(cpu, insn->vaddr, insn->len);
+                        insn->vaddr, insn->len);
 }
 
 const char *qemu_plugin_insn_symbol(const struct qemu_plugin_insn *insn)