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"
47 #include "tcg/tcg-temp-internal.h"
48 #include "tcg/tcg-op.h"
49 #include "exec/exec-all.h"
50 #include "exec/plugin-gen.h"
51 #include "exec/translator.h"
54 # define CONFIG_SOFTMMU_GATE 1
56 # define CONFIG_SOFTMMU_GATE 0
60 * plugin_cb_start TCG op args[]:
61 * 0: enum plugin_gen_from
62 * 1: enum plugin_gen_cb
63 * 2: set to 1 for mem callback that is a write, 0 otherwise.
66 enum plugin_gen_from
{
70 PLUGIN_GEN_AFTER_INSN
,
78 PLUGIN_GEN_ENABLE_MEM_HELPER
,
79 PLUGIN_GEN_DISABLE_MEM_HELPER
,
84 * These helpers are stubs that get dynamically switched out for calls
85 * direct to the plugin if they are subscribed to.
87 void HELPER(plugin_vcpu_udata_cb
)(uint32_t cpu_index
, void *udata
)
90 void HELPER(plugin_vcpu_mem_cb
)(unsigned int vcpu_index
,
91 qemu_plugin_meminfo_t info
, uint64_t vaddr
,
95 static void gen_empty_udata_cb(void)
97 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
98 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
100 tcg_gen_movi_ptr(udata
, 0);
101 tcg_gen_ld_i32(cpu_index
, cpu_env
,
102 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
103 gen_helper_plugin_vcpu_udata_cb(cpu_index
, udata
);
105 tcg_temp_free_ptr(udata
);
106 tcg_temp_free_i32(cpu_index
);
110 * For now we only support addi_i64.
111 * When we support more ops, we can generate one empty inline cb for each.
113 static void gen_empty_inline_cb(void)
115 TCGv_i64 val
= tcg_temp_ebb_new_i64();
116 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
118 tcg_gen_movi_ptr(ptr
, 0);
119 tcg_gen_ld_i64(val
, ptr
, 0);
120 /* pass an immediate != 0 so that it doesn't get optimized away */
121 tcg_gen_addi_i64(val
, val
, 0xdeadface);
122 tcg_gen_st_i64(val
, ptr
, 0);
123 tcg_temp_free_ptr(ptr
);
124 tcg_temp_free_i64(val
);
127 static void gen_empty_mem_cb(TCGv addr
, uint32_t info
)
129 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
130 TCGv_i32 meminfo
= tcg_temp_ebb_new_i32();
131 TCGv_i64 addr64
= tcg_temp_ebb_new_i64();
132 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
134 tcg_gen_movi_i32(meminfo
, info
);
135 tcg_gen_movi_ptr(udata
, 0);
136 tcg_gen_ld_i32(cpu_index
, cpu_env
,
137 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
138 tcg_gen_extu_tl_i64(addr64
, addr
);
140 gen_helper_plugin_vcpu_mem_cb(cpu_index
, meminfo
, addr64
, udata
);
142 tcg_temp_free_ptr(udata
);
143 tcg_temp_free_i64(addr64
);
144 tcg_temp_free_i32(meminfo
);
145 tcg_temp_free_i32(cpu_index
);
149 * Share the same function for enable/disable. When enabling, the NULL
150 * pointer will be overwritten later.
152 static void gen_empty_mem_helper(void)
154 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
156 tcg_gen_movi_ptr(ptr
, 0);
157 tcg_gen_st_ptr(ptr
, cpu_env
, offsetof(CPUState
, plugin_mem_cbs
) -
158 offsetof(ArchCPU
, env
));
159 tcg_temp_free_ptr(ptr
);
162 static void gen_plugin_cb_start(enum plugin_gen_from from
,
163 enum plugin_gen_cb type
, unsigned wr
)
165 tcg_gen_plugin_cb_start(from
, type
, wr
);
168 static void gen_wrapped(enum plugin_gen_from from
,
169 enum plugin_gen_cb type
, void (*func
)(void))
171 gen_plugin_cb_start(from
, type
, 0);
173 tcg_gen_plugin_cb_end();
176 static void plugin_gen_empty_callback(enum plugin_gen_from from
)
179 case PLUGIN_GEN_AFTER_INSN
:
180 gen_wrapped(from
, PLUGIN_GEN_DISABLE_MEM_HELPER
,
181 gen_empty_mem_helper
);
183 case PLUGIN_GEN_FROM_INSN
:
185 * Note: plugin_gen_inject() relies on ENABLE_MEM_HELPER being
186 * the first callback of an instruction
188 gen_wrapped(from
, PLUGIN_GEN_ENABLE_MEM_HELPER
,
189 gen_empty_mem_helper
);
191 case PLUGIN_GEN_FROM_TB
:
192 gen_wrapped(from
, PLUGIN_GEN_CB_UDATA
, gen_empty_udata_cb
);
193 gen_wrapped(from
, PLUGIN_GEN_CB_INLINE
, gen_empty_inline_cb
);
196 g_assert_not_reached();
200 void plugin_gen_empty_mem_callback(TCGv addr
, uint32_t info
)
202 enum qemu_plugin_mem_rw rw
= get_plugin_meminfo_rw(info
);
204 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_MEM
, rw
);
205 gen_empty_mem_cb(addr
, info
);
206 tcg_gen_plugin_cb_end();
208 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_INLINE
, rw
);
209 gen_empty_inline_cb();
210 tcg_gen_plugin_cb_end();
213 static TCGOp
*find_op(TCGOp
*op
, TCGOpcode opc
)
216 if (op
->opc
== opc
) {
219 op
= QTAILQ_NEXT(op
, link
);
224 static TCGOp
*rm_ops_range(TCGOp
*begin
, TCGOp
*end
)
226 TCGOp
*ret
= QTAILQ_NEXT(end
, link
);
228 QTAILQ_REMOVE_SEVERAL(&tcg_ctx
->ops
, begin
, end
, link
);
232 /* remove all ops until (and including) plugin_cb_end */
233 static TCGOp
*rm_ops(TCGOp
*op
)
235 TCGOp
*end_op
= find_op(op
, INDEX_op_plugin_cb_end
);
237 tcg_debug_assert(end_op
);
238 return rm_ops_range(op
, end_op
);
241 static TCGOp
*copy_op_nocheck(TCGOp
**begin_op
, TCGOp
*op
)
243 TCGOp
*old_op
= QTAILQ_NEXT(*begin_op
, link
);
244 unsigned nargs
= old_op
->nargs
;
247 op
= tcg_op_insert_after(tcg_ctx
, op
, old_op
->opc
, nargs
);
248 memcpy(op
->args
, old_op
->args
, sizeof(op
->args
[0]) * nargs
);
253 static TCGOp
*copy_op(TCGOp
**begin_op
, TCGOp
*op
, TCGOpcode opc
)
255 op
= copy_op_nocheck(begin_op
, op
);
256 tcg_debug_assert((*begin_op
)->opc
== opc
);
260 static TCGOp
*copy_extu_i32_i64(TCGOp
**begin_op
, TCGOp
*op
)
262 if (TCG_TARGET_REG_BITS
== 32) {
264 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
266 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
269 op
= copy_op(begin_op
, op
, INDEX_op_extu_i32_i64
);
274 static TCGOp
*copy_mov_i64(TCGOp
**begin_op
, TCGOp
*op
)
276 if (TCG_TARGET_REG_BITS
== 32) {
278 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
279 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
282 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
287 static TCGOp
*copy_const_ptr(TCGOp
**begin_op
, TCGOp
*op
, void *ptr
)
289 if (UINTPTR_MAX
== UINT32_MAX
) {
291 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
292 op
->args
[1] = tcgv_i32_arg(tcg_constant_i32((uintptr_t)ptr
));
295 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
296 op
->args
[1] = tcgv_i64_arg(tcg_constant_i64((uintptr_t)ptr
));
301 static TCGOp
*copy_extu_tl_i64(TCGOp
**begin_op
, TCGOp
*op
)
303 if (TARGET_LONG_BITS
== 32) {
305 op
= copy_extu_i32_i64(begin_op
, op
);
308 op
= copy_mov_i64(begin_op
, op
);
313 static TCGOp
*copy_ld_i64(TCGOp
**begin_op
, TCGOp
*op
)
315 if (TCG_TARGET_REG_BITS
== 32) {
317 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
318 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
321 op
= copy_op(begin_op
, op
, INDEX_op_ld_i64
);
326 static TCGOp
*copy_st_i64(TCGOp
**begin_op
, TCGOp
*op
)
328 if (TCG_TARGET_REG_BITS
== 32) {
330 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
331 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
334 op
= copy_op(begin_op
, op
, INDEX_op_st_i64
);
339 static TCGOp
*copy_add_i64(TCGOp
**begin_op
, TCGOp
*op
, uint64_t v
)
341 if (TCG_TARGET_REG_BITS
== 32) {
342 /* all 32-bit backends must implement add2_i32 */
343 g_assert(TCG_TARGET_HAS_add2_i32
);
344 op
= copy_op(begin_op
, op
, INDEX_op_add2_i32
);
345 op
->args
[4] = tcgv_i32_arg(tcg_constant_i32(v
));
346 op
->args
[5] = tcgv_i32_arg(tcg_constant_i32(v
>> 32));
348 op
= copy_op(begin_op
, op
, INDEX_op_add_i64
);
349 op
->args
[2] = tcgv_i64_arg(tcg_constant_i64(v
));
354 static TCGOp
*copy_st_ptr(TCGOp
**begin_op
, TCGOp
*op
)
356 if (UINTPTR_MAX
== UINT32_MAX
) {
358 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
361 op
= copy_st_i64(begin_op
, op
);
366 static TCGOp
*copy_call(TCGOp
**begin_op
, TCGOp
*op
, void *empty_func
,
367 void *func
, int *cb_idx
)
372 /* copy all ops until the call */
374 op
= copy_op_nocheck(begin_op
, op
);
375 } while (op
->opc
!= INDEX_op_call
);
377 /* fill in the op call */
379 TCGOP_CALLI(op
) = TCGOP_CALLI(old_op
);
380 TCGOP_CALLO(op
) = TCGOP_CALLO(old_op
);
381 tcg_debug_assert(op
->life
== 0);
383 func_idx
= TCGOP_CALLO(op
) + TCGOP_CALLI(op
);
385 op
->args
[func_idx
] = (uintptr_t)func
;
391 * When we append/replace ops here we are sensitive to changing patterns of
392 * TCGOps generated by the tcg_gen_FOO calls when we generated the
393 * empty callbacks. This will assert very quickly in a debug build as
394 * we assert the ops we are replacing are the correct ones.
396 static TCGOp
*append_udata_cb(const struct qemu_plugin_dyn_cb
*cb
,
397 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
400 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
402 /* copy the ld_i32, but note that we only have to copy it once */
404 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
406 begin_op
= QTAILQ_NEXT(begin_op
, link
);
407 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
411 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_udata_cb
),
412 cb
->f
.vcpu_udata
, cb_idx
);
417 static TCGOp
*append_inline_cb(const struct qemu_plugin_dyn_cb
*cb
,
418 TCGOp
*begin_op
, TCGOp
*op
,
422 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
425 op
= copy_ld_i64(&begin_op
, op
);
428 op
= copy_add_i64(&begin_op
, op
, cb
->inline_insn
.imm
);
431 op
= copy_st_i64(&begin_op
, op
);
436 static TCGOp
*append_mem_cb(const struct qemu_plugin_dyn_cb
*cb
,
437 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
439 enum plugin_gen_cb type
= begin_op
->args
[1];
441 tcg_debug_assert(type
== PLUGIN_GEN_CB_MEM
);
443 /* const_i32 == mov_i32 ("info", so it remains as is) */
444 op
= copy_op(&begin_op
, op
, INDEX_op_mov_i32
);
447 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
449 /* copy the ld_i32, but note that we only have to copy it once */
451 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
453 begin_op
= QTAILQ_NEXT(begin_op
, link
);
454 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
458 op
= copy_extu_tl_i64(&begin_op
, op
);
460 if (type
== PLUGIN_GEN_CB_MEM
) {
462 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_mem_cb
),
463 cb
->f
.vcpu_udata
, cb_idx
);
469 typedef TCGOp
*(*inject_fn
)(const struct qemu_plugin_dyn_cb
*cb
,
470 TCGOp
*begin_op
, TCGOp
*op
, int *intp
);
471 typedef bool (*op_ok_fn
)(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
);
473 static bool op_ok(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
478 static bool op_rw(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
483 return !!(cb
->rw
& (w
+ 1));
486 static void inject_cb_type(const GArray
*cbs
, TCGOp
*begin_op
,
487 inject_fn inject
, op_ok_fn ok
)
494 if (!cbs
|| cbs
->len
== 0) {
499 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
500 tcg_debug_assert(end_op
);
503 for (i
= 0; i
< cbs
->len
; i
++) {
504 struct qemu_plugin_dyn_cb
*cb
=
505 &g_array_index(cbs
, struct qemu_plugin_dyn_cb
, i
);
507 if (!ok(begin_op
, cb
)) {
510 op
= inject(cb
, begin_op
, op
, &cb_idx
);
512 rm_ops_range(begin_op
, end_op
);
516 inject_udata_cb(const GArray
*cbs
, TCGOp
*begin_op
)
518 inject_cb_type(cbs
, begin_op
, append_udata_cb
, op_ok
);
522 inject_inline_cb(const GArray
*cbs
, TCGOp
*begin_op
, op_ok_fn ok
)
524 inject_cb_type(cbs
, begin_op
, append_inline_cb
, ok
);
528 inject_mem_cb(const GArray
*cbs
, TCGOp
*begin_op
)
530 inject_cb_type(cbs
, begin_op
, append_mem_cb
, op_rw
);
533 /* we could change the ops in place, but we can reuse more code by copying */
534 static void inject_mem_helper(TCGOp
*begin_op
, GArray
*arr
)
536 TCGOp
*orig_op
= begin_op
;
540 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
541 tcg_debug_assert(end_op
);
544 op
= copy_const_ptr(&begin_op
, end_op
, arr
);
547 op
= copy_st_ptr(&begin_op
, op
);
549 rm_ops_range(orig_op
, end_op
);
553 * Tracking memory accesses performed from helpers requires extra work.
554 * If an instruction is emulated with helpers, we do two things:
555 * (1) copy the CB descriptors, and keep track of it so that they can be
556 * freed later on, and (2) point CPUState.plugin_mem_cbs to the descriptors, so
557 * that we can read them at run-time (i.e. when the helper executes).
558 * This run-time access is performed from qemu_plugin_vcpu_mem_cb.
560 * Note that plugin_gen_disable_mem_helpers undoes (2). Since it
561 * is possible that the code we generate after the instruction is
562 * dead, we also add checks before generating tb_exit etc.
564 static void inject_mem_enable_helper(struct qemu_plugin_tb
*ptb
,
565 struct qemu_plugin_insn
*plugin_insn
,
572 cbs
[0] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
];
573 cbs
[1] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
576 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
577 n_cbs
+= cbs
[i
]->len
;
580 plugin_insn
->mem_helper
= plugin_insn
->calls_helpers
&& n_cbs
;
581 if (likely(!plugin_insn
->mem_helper
)) {
585 ptb
->mem_helper
= true;
587 arr
= g_array_sized_new(false, false,
588 sizeof(struct qemu_plugin_dyn_cb
), n_cbs
);
590 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
591 g_array_append_vals(arr
, cbs
[i
]->data
, cbs
[i
]->len
);
594 qemu_plugin_add_dyn_cb_arr(arr
);
595 inject_mem_helper(begin_op
, arr
);
598 static void inject_mem_disable_helper(struct qemu_plugin_insn
*plugin_insn
,
601 if (likely(!plugin_insn
->mem_helper
)) {
605 inject_mem_helper(begin_op
, NULL
);
608 /* called before finishing a TB with exit_tb, goto_tb or goto_ptr */
609 void plugin_gen_disable_mem_helpers(void)
612 * We could emit the clearing unconditionally and be done. However, this can
613 * be wasteful if for instance plugins don't track memory accesses, or if
614 * most TBs don't use helpers. Instead, emit the clearing iff the TB calls
615 * helpers that might access guest memory.
617 * Note: we do not reset plugin_tb->mem_helper here; a TB might have several
618 * exit points, and we want to emit the clearing from all of them.
620 if (!tcg_ctx
->plugin_tb
->mem_helper
) {
623 tcg_gen_st_ptr(tcg_constant_ptr(NULL
), cpu_env
,
624 offsetof(CPUState
, plugin_mem_cbs
) - offsetof(ArchCPU
, env
));
627 static void plugin_gen_tb_udata(const struct qemu_plugin_tb
*ptb
,
630 inject_udata_cb(ptb
->cbs
[PLUGIN_CB_REGULAR
], begin_op
);
633 static void plugin_gen_tb_inline(const struct qemu_plugin_tb
*ptb
,
636 inject_inline_cb(ptb
->cbs
[PLUGIN_CB_INLINE
], begin_op
, op_ok
);
639 static void plugin_gen_insn_udata(const struct qemu_plugin_tb
*ptb
,
640 TCGOp
*begin_op
, int insn_idx
)
642 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
644 inject_udata_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_REGULAR
], begin_op
);
647 static void plugin_gen_insn_inline(const struct qemu_plugin_tb
*ptb
,
648 TCGOp
*begin_op
, int insn_idx
)
650 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
651 inject_inline_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_INLINE
],
655 static void plugin_gen_mem_regular(const struct qemu_plugin_tb
*ptb
,
656 TCGOp
*begin_op
, int insn_idx
)
658 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
659 inject_mem_cb(insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
], begin_op
);
662 static void plugin_gen_mem_inline(const struct qemu_plugin_tb
*ptb
,
663 TCGOp
*begin_op
, int insn_idx
)
666 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
668 cbs
= insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
669 inject_inline_cb(cbs
, begin_op
, op_rw
);
672 static void plugin_gen_enable_mem_helper(struct qemu_plugin_tb
*ptb
,
673 TCGOp
*begin_op
, int insn_idx
)
675 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
676 inject_mem_enable_helper(ptb
, insn
, begin_op
);
679 static void plugin_gen_disable_mem_helper(struct qemu_plugin_tb
*ptb
,
680 TCGOp
*begin_op
, int insn_idx
)
682 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
683 inject_mem_disable_helper(insn
, begin_op
);
686 /* #define DEBUG_PLUGIN_GEN_OPS */
687 static void pr_ops(void)
689 #ifdef DEBUG_PLUGIN_GEN_OPS
693 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
694 const char *name
= "";
695 const char *type
= "";
697 if (op
->opc
== INDEX_op_plugin_cb_start
) {
698 switch (op
->args
[0]) {
699 case PLUGIN_GEN_FROM_TB
:
702 case PLUGIN_GEN_FROM_INSN
:
705 case PLUGIN_GEN_FROM_MEM
:
708 case PLUGIN_GEN_AFTER_INSN
:
714 switch (op
->args
[1]) {
715 case PLUGIN_GEN_CB_UDATA
:
718 case PLUGIN_GEN_CB_INLINE
:
721 case PLUGIN_GEN_CB_MEM
:
724 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
725 type
= "enable mem helper";
727 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
728 type
= "disable mem helper";
734 printf("op[%2i]: %s %s %s\n", i
, tcg_op_defs
[op
->opc
].name
, name
, type
);
740 static void plugin_gen_inject(struct qemu_plugin_tb
*plugin_tb
)
747 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
749 case INDEX_op_insn_start
:
752 case INDEX_op_plugin_cb_start
:
754 enum plugin_gen_from from
= op
->args
[0];
755 enum plugin_gen_cb type
= op
->args
[1];
758 case PLUGIN_GEN_FROM_TB
:
760 g_assert(insn_idx
== -1);
763 case PLUGIN_GEN_CB_UDATA
:
764 plugin_gen_tb_udata(plugin_tb
, op
);
766 case PLUGIN_GEN_CB_INLINE
:
767 plugin_gen_tb_inline(plugin_tb
, op
);
770 g_assert_not_reached();
774 case PLUGIN_GEN_FROM_INSN
:
776 g_assert(insn_idx
>= 0);
779 case PLUGIN_GEN_CB_UDATA
:
780 plugin_gen_insn_udata(plugin_tb
, op
, insn_idx
);
782 case PLUGIN_GEN_CB_INLINE
:
783 plugin_gen_insn_inline(plugin_tb
, op
, insn_idx
);
785 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
786 plugin_gen_enable_mem_helper(plugin_tb
, op
, insn_idx
);
789 g_assert_not_reached();
793 case PLUGIN_GEN_FROM_MEM
:
795 g_assert(insn_idx
>= 0);
798 case PLUGIN_GEN_CB_MEM
:
799 plugin_gen_mem_regular(plugin_tb
, op
, insn_idx
);
801 case PLUGIN_GEN_CB_INLINE
:
802 plugin_gen_mem_inline(plugin_tb
, op
, insn_idx
);
805 g_assert_not_reached();
810 case PLUGIN_GEN_AFTER_INSN
:
812 g_assert(insn_idx
>= 0);
815 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
816 plugin_gen_disable_mem_helper(plugin_tb
, op
, insn_idx
);
819 g_assert_not_reached();
824 g_assert_not_reached();
829 /* plugins don't care about any other ops */
836 bool plugin_gen_tb_start(CPUState
*cpu
, const DisasContextBase
*db
,
841 if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS
, cpu
->plugin_mask
)) {
842 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
845 /* reset callbacks */
846 for (i
= 0; i
< PLUGIN_N_CB_SUBTYPES
; i
++) {
848 g_array_set_size(ptb
->cbs
[i
], 0);
855 ptb
->vaddr
= db
->pc_first
;
857 ptb
->haddr1
= db
->host_addr
[0];
859 ptb
->mem_only
= mem_only
;
860 ptb
->mem_helper
= false;
862 plugin_gen_empty_callback(PLUGIN_GEN_FROM_TB
);
865 tcg_ctx
->plugin_insn
= NULL
;
870 void plugin_gen_insn_start(CPUState
*cpu
, const DisasContextBase
*db
)
872 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
873 struct qemu_plugin_insn
*pinsn
;
875 pinsn
= qemu_plugin_tb_insn_get(ptb
, db
->pc_next
);
876 tcg_ctx
->plugin_insn
= pinsn
;
877 plugin_gen_empty_callback(PLUGIN_GEN_FROM_INSN
);
880 * Detect page crossing to get the new host address.
881 * Note that we skip this when haddr1 == NULL, e.g. when we're
882 * fetching instructions from a region not backed by RAM.
884 if (ptb
->haddr1
== NULL
) {
886 } else if (is_same_page(db
, db
->pc_next
)) {
887 pinsn
->haddr
= ptb
->haddr1
+ pinsn
->vaddr
- ptb
->vaddr
;
889 if (ptb
->vaddr2
== -1) {
890 ptb
->vaddr2
= TARGET_PAGE_ALIGN(db
->pc_first
);
891 get_page_addr_code_hostp(cpu
->env_ptr
, ptb
->vaddr2
, &ptb
->haddr2
);
893 pinsn
->haddr
= ptb
->haddr2
+ pinsn
->vaddr
- ptb
->vaddr2
;
897 void plugin_gen_insn_end(void)
899 plugin_gen_empty_callback(PLUGIN_GEN_AFTER_INSN
);
903 * There are cases where we never get to finalise a translation - for
904 * example a page fault during translation. As a result we shouldn't
905 * do any clean-up here and make sure things are reset in
906 * plugin_gen_tb_start.
908 void plugin_gen_tb_end(CPUState
*cpu
)
910 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
912 /* collect instrumentation requests */
913 qemu_plugin_tb_trans_cb(cpu
, ptb
);
915 /* inject the instrumentation at the appropriate places */
916 plugin_gen_inject(ptb
);