2 * plugin-gen.c - TCG-related bits of plugin infrastructure
4 * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
5 * License: GNU GPL, version 2 or later.
6 * See the COPYING file in the top-level directory.
8 * We support instrumentation at an instruction granularity. That is,
9 * if a plugin wants to instrument the memory accesses performed by a
10 * particular instruction, it can just do that instead of instrumenting
11 * all memory accesses. Thus, in order to do this we first have to
12 * translate a TB, so that plugins can decide what/where to instrument.
14 * Injecting the desired instrumentation could be done with a second
15 * translation pass that combined the instrumentation requests, but that
16 * would be ugly and inefficient since we would decode the guest code twice.
17 * Instead, during TB translation we add "empty" instrumentation calls for all
18 * possible instrumentation events, and then once we collect the instrumentation
19 * requests from plugins, we either "fill in" those empty events or remove them
20 * if they have no requests.
22 * When "filling in" an event we first copy the empty callback's TCG ops. This
23 * might seem unnecessary, but it is done to support an arbitrary number
24 * of callbacks per event. Take for example a regular instruction callback.
25 * We first generate a callback to an empty helper function. Then, if two
26 * plugins register one callback each for this instruction, we make two copies
27 * of the TCG ops generated for the empty callback, substituting the function
28 * pointer that points to the empty helper function with the plugins' desired
29 * callback functions. After that we remove the empty callback's ops.
31 * Note that the location in TCGOp.args[] of the pointer to a helper function
32 * varies across different guest and host architectures. Instead of duplicating
33 * the logic that figures this out, we rely on the fact that the empty
34 * callbacks point to empty functions that are unique pointers in the program.
35 * Thus, to find the right location we just have to look for a match in
36 * TCGOp.args[]. This is the main reason why we first copy an empty callback's
37 * TCG ops and then fill them in; regardless of whether we have one or many
38 * callbacks for that event, the logic to add all of them is the same.
40 * When generating more than one callback per event, we make a small
41 * optimization to avoid generating redundant operations. For instance, for the
42 * second and all subsequent callbacks of an event, we do not need to reload the
43 * CPU's index into a TCG temp, since the first callback did it already.
45 #include "qemu/osdep.h"
48 #include "tcg/tcg-temp-internal.h"
49 #include "tcg/tcg-op.h"
50 #include "exec/exec-all.h"
51 #include "exec/plugin-gen.h"
52 #include "exec/translator.h"
53 #include "exec/helper-proto-common.h"
55 #define HELPER_H "accel/tcg/plugin-helpers.h"
56 #include "exec/helper-info.c.inc"
60 # define CONFIG_SOFTMMU_GATE 1
62 # define CONFIG_SOFTMMU_GATE 0
66 * plugin_cb_start TCG op args[]:
67 * 0: enum plugin_gen_from
68 * 1: enum plugin_gen_cb
69 * 2: set to 1 for mem callback that is a write, 0 otherwise.
72 enum plugin_gen_from
{
76 PLUGIN_GEN_AFTER_INSN
,
84 PLUGIN_GEN_ENABLE_MEM_HELPER
,
85 PLUGIN_GEN_DISABLE_MEM_HELPER
,
90 * These helpers are stubs that get dynamically switched out for calls
91 * direct to the plugin if they are subscribed to.
93 void HELPER(plugin_vcpu_udata_cb
)(uint32_t cpu_index
, void *udata
)
96 void HELPER(plugin_vcpu_mem_cb
)(unsigned int vcpu_index
,
97 qemu_plugin_meminfo_t info
, uint64_t vaddr
,
101 static void gen_empty_udata_cb(void)
103 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
104 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
106 tcg_gen_movi_ptr(udata
, 0);
107 tcg_gen_ld_i32(cpu_index
, tcg_env
,
108 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
109 gen_helper_plugin_vcpu_udata_cb(cpu_index
, udata
);
111 tcg_temp_free_ptr(udata
);
112 tcg_temp_free_i32(cpu_index
);
116 * For now we only support addi_i64.
117 * When we support more ops, we can generate one empty inline cb for each.
119 static void gen_empty_inline_cb(void)
121 TCGv_i64 val
= tcg_temp_ebb_new_i64();
122 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
124 tcg_gen_movi_ptr(ptr
, 0);
125 tcg_gen_ld_i64(val
, ptr
, 0);
126 /* pass an immediate != 0 so that it doesn't get optimized away */
127 tcg_gen_addi_i64(val
, val
, 0xdeadface);
128 tcg_gen_st_i64(val
, ptr
, 0);
129 tcg_temp_free_ptr(ptr
);
130 tcg_temp_free_i64(val
);
133 static void gen_empty_mem_cb(TCGv_i64 addr
, uint32_t info
)
135 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
136 TCGv_i32 meminfo
= tcg_temp_ebb_new_i32();
137 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
139 tcg_gen_movi_i32(meminfo
, info
);
140 tcg_gen_movi_ptr(udata
, 0);
141 tcg_gen_ld_i32(cpu_index
, tcg_env
,
142 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
144 gen_helper_plugin_vcpu_mem_cb(cpu_index
, meminfo
, addr
, udata
);
146 tcg_temp_free_ptr(udata
);
147 tcg_temp_free_i32(meminfo
);
148 tcg_temp_free_i32(cpu_index
);
152 * Share the same function for enable/disable. When enabling, the NULL
153 * pointer will be overwritten later.
155 static void gen_empty_mem_helper(void)
157 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
159 tcg_gen_movi_ptr(ptr
, 0);
160 tcg_gen_st_ptr(ptr
, tcg_env
, offsetof(CPUState
, plugin_mem_cbs
) -
161 offsetof(ArchCPU
, env
));
162 tcg_temp_free_ptr(ptr
);
165 static void gen_plugin_cb_start(enum plugin_gen_from from
,
166 enum plugin_gen_cb type
, unsigned wr
)
168 tcg_gen_plugin_cb_start(from
, type
, wr
);
171 static void gen_wrapped(enum plugin_gen_from from
,
172 enum plugin_gen_cb type
, void (*func
)(void))
174 gen_plugin_cb_start(from
, type
, 0);
176 tcg_gen_plugin_cb_end();
179 static void plugin_gen_empty_callback(enum plugin_gen_from from
)
182 case PLUGIN_GEN_AFTER_INSN
:
183 gen_wrapped(from
, PLUGIN_GEN_DISABLE_MEM_HELPER
,
184 gen_empty_mem_helper
);
186 case PLUGIN_GEN_FROM_INSN
:
188 * Note: plugin_gen_inject() relies on ENABLE_MEM_HELPER being
189 * the first callback of an instruction
191 gen_wrapped(from
, PLUGIN_GEN_ENABLE_MEM_HELPER
,
192 gen_empty_mem_helper
);
194 case PLUGIN_GEN_FROM_TB
:
195 gen_wrapped(from
, PLUGIN_GEN_CB_UDATA
, gen_empty_udata_cb
);
196 gen_wrapped(from
, PLUGIN_GEN_CB_INLINE
, gen_empty_inline_cb
);
199 g_assert_not_reached();
203 void plugin_gen_empty_mem_callback(TCGv_i64 addr
, uint32_t info
)
205 enum qemu_plugin_mem_rw rw
= get_plugin_meminfo_rw(info
);
207 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_MEM
, rw
);
208 gen_empty_mem_cb(addr
, info
);
209 tcg_gen_plugin_cb_end();
211 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_INLINE
, rw
);
212 gen_empty_inline_cb();
213 tcg_gen_plugin_cb_end();
216 static TCGOp
*find_op(TCGOp
*op
, TCGOpcode opc
)
219 if (op
->opc
== opc
) {
222 op
= QTAILQ_NEXT(op
, link
);
227 static TCGOp
*rm_ops_range(TCGOp
*begin
, TCGOp
*end
)
229 TCGOp
*ret
= QTAILQ_NEXT(end
, link
);
231 QTAILQ_REMOVE_SEVERAL(&tcg_ctx
->ops
, begin
, end
, link
);
235 /* remove all ops until (and including) plugin_cb_end */
236 static TCGOp
*rm_ops(TCGOp
*op
)
238 TCGOp
*end_op
= find_op(op
, INDEX_op_plugin_cb_end
);
240 tcg_debug_assert(end_op
);
241 return rm_ops_range(op
, end_op
);
244 static TCGOp
*copy_op_nocheck(TCGOp
**begin_op
, TCGOp
*op
)
246 TCGOp
*old_op
= QTAILQ_NEXT(*begin_op
, link
);
247 unsigned nargs
= old_op
->nargs
;
250 op
= tcg_op_insert_after(tcg_ctx
, op
, old_op
->opc
, nargs
);
251 memcpy(op
->args
, old_op
->args
, sizeof(op
->args
[0]) * nargs
);
256 static TCGOp
*copy_op(TCGOp
**begin_op
, TCGOp
*op
, TCGOpcode opc
)
258 op
= copy_op_nocheck(begin_op
, op
);
259 tcg_debug_assert((*begin_op
)->opc
== opc
);
263 static TCGOp
*copy_const_ptr(TCGOp
**begin_op
, TCGOp
*op
, void *ptr
)
265 if (UINTPTR_MAX
== UINT32_MAX
) {
267 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
268 op
->args
[1] = tcgv_i32_arg(tcg_constant_i32((uintptr_t)ptr
));
271 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
272 op
->args
[1] = tcgv_i64_arg(tcg_constant_i64((uintptr_t)ptr
));
277 static TCGOp
*copy_ld_i64(TCGOp
**begin_op
, TCGOp
*op
)
279 if (TCG_TARGET_REG_BITS
== 32) {
281 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
282 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
285 op
= copy_op(begin_op
, op
, INDEX_op_ld_i64
);
290 static TCGOp
*copy_st_i64(TCGOp
**begin_op
, TCGOp
*op
)
292 if (TCG_TARGET_REG_BITS
== 32) {
294 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
295 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
298 op
= copy_op(begin_op
, op
, INDEX_op_st_i64
);
303 static TCGOp
*copy_add_i64(TCGOp
**begin_op
, TCGOp
*op
, uint64_t v
)
305 if (TCG_TARGET_REG_BITS
== 32) {
306 /* all 32-bit backends must implement add2_i32 */
307 g_assert(TCG_TARGET_HAS_add2_i32
);
308 op
= copy_op(begin_op
, op
, INDEX_op_add2_i32
);
309 op
->args
[4] = tcgv_i32_arg(tcg_constant_i32(v
));
310 op
->args
[5] = tcgv_i32_arg(tcg_constant_i32(v
>> 32));
312 op
= copy_op(begin_op
, op
, INDEX_op_add_i64
);
313 op
->args
[2] = tcgv_i64_arg(tcg_constant_i64(v
));
318 static TCGOp
*copy_st_ptr(TCGOp
**begin_op
, TCGOp
*op
)
320 if (UINTPTR_MAX
== UINT32_MAX
) {
322 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
325 op
= copy_st_i64(begin_op
, op
);
330 static TCGOp
*copy_call(TCGOp
**begin_op
, TCGOp
*op
, void *empty_func
,
331 void *func
, int *cb_idx
)
336 /* copy all ops until the call */
338 op
= copy_op_nocheck(begin_op
, op
);
339 } while (op
->opc
!= INDEX_op_call
);
341 /* fill in the op call */
343 TCGOP_CALLI(op
) = TCGOP_CALLI(old_op
);
344 TCGOP_CALLO(op
) = TCGOP_CALLO(old_op
);
345 tcg_debug_assert(op
->life
== 0);
347 func_idx
= TCGOP_CALLO(op
) + TCGOP_CALLI(op
);
349 op
->args
[func_idx
] = (uintptr_t)func
;
355 * When we append/replace ops here we are sensitive to changing patterns of
356 * TCGOps generated by the tcg_gen_FOO calls when we generated the
357 * empty callbacks. This will assert very quickly in a debug build as
358 * we assert the ops we are replacing are the correct ones.
360 static TCGOp
*append_udata_cb(const struct qemu_plugin_dyn_cb
*cb
,
361 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
364 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
366 /* copy the ld_i32, but note that we only have to copy it once */
368 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
370 begin_op
= QTAILQ_NEXT(begin_op
, link
);
371 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
375 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_udata_cb
),
376 cb
->f
.vcpu_udata
, cb_idx
);
381 static TCGOp
*append_inline_cb(const struct qemu_plugin_dyn_cb
*cb
,
382 TCGOp
*begin_op
, TCGOp
*op
,
386 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
389 op
= copy_ld_i64(&begin_op
, op
);
392 op
= copy_add_i64(&begin_op
, op
, cb
->inline_insn
.imm
);
395 op
= copy_st_i64(&begin_op
, op
);
400 static TCGOp
*append_mem_cb(const struct qemu_plugin_dyn_cb
*cb
,
401 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
403 enum plugin_gen_cb type
= begin_op
->args
[1];
405 tcg_debug_assert(type
== PLUGIN_GEN_CB_MEM
);
407 /* const_i32 == mov_i32 ("info", so it remains as is) */
408 op
= copy_op(&begin_op
, op
, INDEX_op_mov_i32
);
411 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
413 /* copy the ld_i32, but note that we only have to copy it once */
415 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
417 begin_op
= QTAILQ_NEXT(begin_op
, link
);
418 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
421 if (type
== PLUGIN_GEN_CB_MEM
) {
423 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_mem_cb
),
424 cb
->f
.vcpu_udata
, cb_idx
);
430 typedef TCGOp
*(*inject_fn
)(const struct qemu_plugin_dyn_cb
*cb
,
431 TCGOp
*begin_op
, TCGOp
*op
, int *intp
);
432 typedef bool (*op_ok_fn
)(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
);
434 static bool op_ok(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
439 static bool op_rw(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
444 return !!(cb
->rw
& (w
+ 1));
447 static void inject_cb_type(const GArray
*cbs
, TCGOp
*begin_op
,
448 inject_fn inject
, op_ok_fn ok
)
455 if (!cbs
|| cbs
->len
== 0) {
460 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
461 tcg_debug_assert(end_op
);
464 for (i
= 0; i
< cbs
->len
; i
++) {
465 struct qemu_plugin_dyn_cb
*cb
=
466 &g_array_index(cbs
, struct qemu_plugin_dyn_cb
, i
);
468 if (!ok(begin_op
, cb
)) {
471 op
= inject(cb
, begin_op
, op
, &cb_idx
);
473 rm_ops_range(begin_op
, end_op
);
477 inject_udata_cb(const GArray
*cbs
, TCGOp
*begin_op
)
479 inject_cb_type(cbs
, begin_op
, append_udata_cb
, op_ok
);
483 inject_inline_cb(const GArray
*cbs
, TCGOp
*begin_op
, op_ok_fn ok
)
485 inject_cb_type(cbs
, begin_op
, append_inline_cb
, ok
);
489 inject_mem_cb(const GArray
*cbs
, TCGOp
*begin_op
)
491 inject_cb_type(cbs
, begin_op
, append_mem_cb
, op_rw
);
494 /* we could change the ops in place, but we can reuse more code by copying */
495 static void inject_mem_helper(TCGOp
*begin_op
, GArray
*arr
)
497 TCGOp
*orig_op
= begin_op
;
501 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
502 tcg_debug_assert(end_op
);
505 op
= copy_const_ptr(&begin_op
, end_op
, arr
);
508 op
= copy_st_ptr(&begin_op
, op
);
510 rm_ops_range(orig_op
, end_op
);
514 * Tracking memory accesses performed from helpers requires extra work.
515 * If an instruction is emulated with helpers, we do two things:
516 * (1) copy the CB descriptors, and keep track of it so that they can be
517 * freed later on, and (2) point CPUState.plugin_mem_cbs to the descriptors, so
518 * that we can read them at run-time (i.e. when the helper executes).
519 * This run-time access is performed from qemu_plugin_vcpu_mem_cb.
521 * Note that plugin_gen_disable_mem_helpers undoes (2). Since it
522 * is possible that the code we generate after the instruction is
523 * dead, we also add checks before generating tb_exit etc.
525 static void inject_mem_enable_helper(struct qemu_plugin_tb
*ptb
,
526 struct qemu_plugin_insn
*plugin_insn
,
533 cbs
[0] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
];
534 cbs
[1] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
537 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
538 n_cbs
+= cbs
[i
]->len
;
541 plugin_insn
->mem_helper
= plugin_insn
->calls_helpers
&& n_cbs
;
542 if (likely(!plugin_insn
->mem_helper
)) {
546 ptb
->mem_helper
= true;
548 arr
= g_array_sized_new(false, false,
549 sizeof(struct qemu_plugin_dyn_cb
), n_cbs
);
551 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
552 g_array_append_vals(arr
, cbs
[i
]->data
, cbs
[i
]->len
);
555 qemu_plugin_add_dyn_cb_arr(arr
);
556 inject_mem_helper(begin_op
, arr
);
559 static void inject_mem_disable_helper(struct qemu_plugin_insn
*plugin_insn
,
562 if (likely(!plugin_insn
->mem_helper
)) {
566 inject_mem_helper(begin_op
, NULL
);
569 /* called before finishing a TB with exit_tb, goto_tb or goto_ptr */
570 void plugin_gen_disable_mem_helpers(void)
573 * We could emit the clearing unconditionally and be done. However, this can
574 * be wasteful if for instance plugins don't track memory accesses, or if
575 * most TBs don't use helpers. Instead, emit the clearing iff the TB calls
576 * helpers that might access guest memory.
578 * Note: we do not reset plugin_tb->mem_helper here; a TB might have several
579 * exit points, and we want to emit the clearing from all of them.
581 if (!tcg_ctx
->plugin_tb
->mem_helper
) {
584 tcg_gen_st_ptr(tcg_constant_ptr(NULL
), tcg_env
,
585 offsetof(CPUState
, plugin_mem_cbs
) - offsetof(ArchCPU
, env
));
588 static void plugin_gen_tb_udata(const struct qemu_plugin_tb
*ptb
,
591 inject_udata_cb(ptb
->cbs
[PLUGIN_CB_REGULAR
], begin_op
);
594 static void plugin_gen_tb_inline(const struct qemu_plugin_tb
*ptb
,
597 inject_inline_cb(ptb
->cbs
[PLUGIN_CB_INLINE
], begin_op
, op_ok
);
600 static void plugin_gen_insn_udata(const struct qemu_plugin_tb
*ptb
,
601 TCGOp
*begin_op
, int insn_idx
)
603 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
605 inject_udata_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_REGULAR
], begin_op
);
608 static void plugin_gen_insn_inline(const struct qemu_plugin_tb
*ptb
,
609 TCGOp
*begin_op
, int insn_idx
)
611 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
612 inject_inline_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_INLINE
],
616 static void plugin_gen_mem_regular(const struct qemu_plugin_tb
*ptb
,
617 TCGOp
*begin_op
, int insn_idx
)
619 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
620 inject_mem_cb(insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
], begin_op
);
623 static void plugin_gen_mem_inline(const struct qemu_plugin_tb
*ptb
,
624 TCGOp
*begin_op
, int insn_idx
)
627 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
629 cbs
= insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
630 inject_inline_cb(cbs
, begin_op
, op_rw
);
633 static void plugin_gen_enable_mem_helper(struct qemu_plugin_tb
*ptb
,
634 TCGOp
*begin_op
, int insn_idx
)
636 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
637 inject_mem_enable_helper(ptb
, insn
, begin_op
);
640 static void plugin_gen_disable_mem_helper(struct qemu_plugin_tb
*ptb
,
641 TCGOp
*begin_op
, int insn_idx
)
643 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
644 inject_mem_disable_helper(insn
, begin_op
);
647 /* #define DEBUG_PLUGIN_GEN_OPS */
648 static void pr_ops(void)
650 #ifdef DEBUG_PLUGIN_GEN_OPS
654 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
655 const char *name
= "";
656 const char *type
= "";
658 if (op
->opc
== INDEX_op_plugin_cb_start
) {
659 switch (op
->args
[0]) {
660 case PLUGIN_GEN_FROM_TB
:
663 case PLUGIN_GEN_FROM_INSN
:
666 case PLUGIN_GEN_FROM_MEM
:
669 case PLUGIN_GEN_AFTER_INSN
:
675 switch (op
->args
[1]) {
676 case PLUGIN_GEN_CB_UDATA
:
679 case PLUGIN_GEN_CB_INLINE
:
682 case PLUGIN_GEN_CB_MEM
:
685 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
686 type
= "enable mem helper";
688 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
689 type
= "disable mem helper";
695 printf("op[%2i]: %s %s %s\n", i
, tcg_op_defs
[op
->opc
].name
, name
, type
);
701 static void plugin_gen_inject(struct qemu_plugin_tb
*plugin_tb
)
708 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
710 case INDEX_op_insn_start
:
713 case INDEX_op_plugin_cb_start
:
715 enum plugin_gen_from from
= op
->args
[0];
716 enum plugin_gen_cb type
= op
->args
[1];
719 case PLUGIN_GEN_FROM_TB
:
721 g_assert(insn_idx
== -1);
724 case PLUGIN_GEN_CB_UDATA
:
725 plugin_gen_tb_udata(plugin_tb
, op
);
727 case PLUGIN_GEN_CB_INLINE
:
728 plugin_gen_tb_inline(plugin_tb
, op
);
731 g_assert_not_reached();
735 case PLUGIN_GEN_FROM_INSN
:
737 g_assert(insn_idx
>= 0);
740 case PLUGIN_GEN_CB_UDATA
:
741 plugin_gen_insn_udata(plugin_tb
, op
, insn_idx
);
743 case PLUGIN_GEN_CB_INLINE
:
744 plugin_gen_insn_inline(plugin_tb
, op
, insn_idx
);
746 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
747 plugin_gen_enable_mem_helper(plugin_tb
, op
, insn_idx
);
750 g_assert_not_reached();
754 case PLUGIN_GEN_FROM_MEM
:
756 g_assert(insn_idx
>= 0);
759 case PLUGIN_GEN_CB_MEM
:
760 plugin_gen_mem_regular(plugin_tb
, op
, insn_idx
);
762 case PLUGIN_GEN_CB_INLINE
:
763 plugin_gen_mem_inline(plugin_tb
, op
, insn_idx
);
766 g_assert_not_reached();
771 case PLUGIN_GEN_AFTER_INSN
:
773 g_assert(insn_idx
>= 0);
776 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
777 plugin_gen_disable_mem_helper(plugin_tb
, op
, insn_idx
);
780 g_assert_not_reached();
785 g_assert_not_reached();
790 /* plugins don't care about any other ops */
797 bool plugin_gen_tb_start(CPUState
*cpu
, const DisasContextBase
*db
,
802 if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS
, cpu
->plugin_mask
)) {
803 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
806 /* reset callbacks */
807 for (i
= 0; i
< PLUGIN_N_CB_SUBTYPES
; i
++) {
809 g_array_set_size(ptb
->cbs
[i
], 0);
816 ptb
->vaddr
= db
->pc_first
;
818 ptb
->haddr1
= db
->host_addr
[0];
820 ptb
->mem_only
= mem_only
;
821 ptb
->mem_helper
= false;
823 plugin_gen_empty_callback(PLUGIN_GEN_FROM_TB
);
826 tcg_ctx
->plugin_insn
= NULL
;
831 void plugin_gen_insn_start(CPUState
*cpu
, const DisasContextBase
*db
)
833 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
834 struct qemu_plugin_insn
*pinsn
;
836 pinsn
= qemu_plugin_tb_insn_get(ptb
, db
->pc_next
);
837 tcg_ctx
->plugin_insn
= pinsn
;
838 plugin_gen_empty_callback(PLUGIN_GEN_FROM_INSN
);
841 * Detect page crossing to get the new host address.
842 * Note that we skip this when haddr1 == NULL, e.g. when we're
843 * fetching instructions from a region not backed by RAM.
845 if (ptb
->haddr1
== NULL
) {
847 } else if (is_same_page(db
, db
->pc_next
)) {
848 pinsn
->haddr
= ptb
->haddr1
+ pinsn
->vaddr
- ptb
->vaddr
;
850 if (ptb
->vaddr2
== -1) {
851 ptb
->vaddr2
= TARGET_PAGE_ALIGN(db
->pc_first
);
852 get_page_addr_code_hostp(cpu_env(cpu
), ptb
->vaddr2
, &ptb
->haddr2
);
854 pinsn
->haddr
= ptb
->haddr2
+ pinsn
->vaddr
- ptb
->vaddr2
;
858 void plugin_gen_insn_end(void)
860 plugin_gen_empty_callback(PLUGIN_GEN_AFTER_INSN
);
864 * There are cases where we never get to finalise a translation - for
865 * example a page fault during translation. As a result we shouldn't
866 * do any clean-up here and make sure things are reset in
867 * plugin_gen_tb_start.
869 void plugin_gen_tb_end(CPUState
*cpu
, size_t num_insns
)
871 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
873 /* translator may have removed instructions, update final count */
874 g_assert(num_insns
<= ptb
->n
);
877 /* collect instrumentation requests */
878 qemu_plugin_tb_trans_cb(cpu
, ptb
);
880 /* inject the instrumentation at the appropriate places */
881 plugin_gen_inject(ptb
);