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"
52 #include "exec/helper-proto-common.h"
54 #define HELPER_H "accel/tcg/plugin-helpers.h"
55 #include "exec/helper-info.c.inc"
59 # define CONFIG_SOFTMMU_GATE 1
61 # define CONFIG_SOFTMMU_GATE 0
65 * plugin_cb_start TCG op args[]:
66 * 0: enum plugin_gen_from
67 * 1: enum plugin_gen_cb
68 * 2: set to 1 for mem callback that is a write, 0 otherwise.
71 enum plugin_gen_from
{
75 PLUGIN_GEN_AFTER_INSN
,
83 PLUGIN_GEN_ENABLE_MEM_HELPER
,
84 PLUGIN_GEN_DISABLE_MEM_HELPER
,
89 * These helpers are stubs that get dynamically switched out for calls
90 * direct to the plugin if they are subscribed to.
92 void HELPER(plugin_vcpu_udata_cb
)(uint32_t cpu_index
, void *udata
)
95 void HELPER(plugin_vcpu_mem_cb
)(unsigned int vcpu_index
,
96 qemu_plugin_meminfo_t info
, uint64_t vaddr
,
100 static void gen_empty_udata_cb(void)
102 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
103 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
105 tcg_gen_movi_ptr(udata
, 0);
106 tcg_gen_ld_i32(cpu_index
, cpu_env
,
107 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
108 gen_helper_plugin_vcpu_udata_cb(cpu_index
, udata
);
110 tcg_temp_free_ptr(udata
);
111 tcg_temp_free_i32(cpu_index
);
115 * For now we only support addi_i64.
116 * When we support more ops, we can generate one empty inline cb for each.
118 static void gen_empty_inline_cb(void)
120 TCGv_i64 val
= tcg_temp_ebb_new_i64();
121 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
123 tcg_gen_movi_ptr(ptr
, 0);
124 tcg_gen_ld_i64(val
, ptr
, 0);
125 /* pass an immediate != 0 so that it doesn't get optimized away */
126 tcg_gen_addi_i64(val
, val
, 0xdeadface);
127 tcg_gen_st_i64(val
, ptr
, 0);
128 tcg_temp_free_ptr(ptr
);
129 tcg_temp_free_i64(val
);
132 static void gen_empty_mem_cb(TCGv_i64 addr
, uint32_t info
)
134 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
135 TCGv_i32 meminfo
= tcg_temp_ebb_new_i32();
136 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
138 tcg_gen_movi_i32(meminfo
, info
);
139 tcg_gen_movi_ptr(udata
, 0);
140 tcg_gen_ld_i32(cpu_index
, cpu_env
,
141 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
143 gen_helper_plugin_vcpu_mem_cb(cpu_index
, meminfo
, addr
, udata
);
145 tcg_temp_free_ptr(udata
);
146 tcg_temp_free_i32(meminfo
);
147 tcg_temp_free_i32(cpu_index
);
151 * Share the same function for enable/disable. When enabling, the NULL
152 * pointer will be overwritten later.
154 static void gen_empty_mem_helper(void)
156 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
158 tcg_gen_movi_ptr(ptr
, 0);
159 tcg_gen_st_ptr(ptr
, cpu_env
, offsetof(CPUState
, plugin_mem_cbs
) -
160 offsetof(ArchCPU
, env
));
161 tcg_temp_free_ptr(ptr
);
164 static void gen_plugin_cb_start(enum plugin_gen_from from
,
165 enum plugin_gen_cb type
, unsigned wr
)
167 tcg_gen_plugin_cb_start(from
, type
, wr
);
170 static void gen_wrapped(enum plugin_gen_from from
,
171 enum plugin_gen_cb type
, void (*func
)(void))
173 gen_plugin_cb_start(from
, type
, 0);
175 tcg_gen_plugin_cb_end();
178 static void plugin_gen_empty_callback(enum plugin_gen_from from
)
181 case PLUGIN_GEN_AFTER_INSN
:
182 gen_wrapped(from
, PLUGIN_GEN_DISABLE_MEM_HELPER
,
183 gen_empty_mem_helper
);
185 case PLUGIN_GEN_FROM_INSN
:
187 * Note: plugin_gen_inject() relies on ENABLE_MEM_HELPER being
188 * the first callback of an instruction
190 gen_wrapped(from
, PLUGIN_GEN_ENABLE_MEM_HELPER
,
191 gen_empty_mem_helper
);
193 case PLUGIN_GEN_FROM_TB
:
194 gen_wrapped(from
, PLUGIN_GEN_CB_UDATA
, gen_empty_udata_cb
);
195 gen_wrapped(from
, PLUGIN_GEN_CB_INLINE
, gen_empty_inline_cb
);
198 g_assert_not_reached();
202 void plugin_gen_empty_mem_callback(TCGv_i64 addr
, uint32_t info
)
204 enum qemu_plugin_mem_rw rw
= get_plugin_meminfo_rw(info
);
206 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_MEM
, rw
);
207 gen_empty_mem_cb(addr
, info
);
208 tcg_gen_plugin_cb_end();
210 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, PLUGIN_GEN_CB_INLINE
, rw
);
211 gen_empty_inline_cb();
212 tcg_gen_plugin_cb_end();
215 static TCGOp
*find_op(TCGOp
*op
, TCGOpcode opc
)
218 if (op
->opc
== opc
) {
221 op
= QTAILQ_NEXT(op
, link
);
226 static TCGOp
*rm_ops_range(TCGOp
*begin
, TCGOp
*end
)
228 TCGOp
*ret
= QTAILQ_NEXT(end
, link
);
230 QTAILQ_REMOVE_SEVERAL(&tcg_ctx
->ops
, begin
, end
, link
);
234 /* remove all ops until (and including) plugin_cb_end */
235 static TCGOp
*rm_ops(TCGOp
*op
)
237 TCGOp
*end_op
= find_op(op
, INDEX_op_plugin_cb_end
);
239 tcg_debug_assert(end_op
);
240 return rm_ops_range(op
, end_op
);
243 static TCGOp
*copy_op_nocheck(TCGOp
**begin_op
, TCGOp
*op
)
245 TCGOp
*old_op
= QTAILQ_NEXT(*begin_op
, link
);
246 unsigned nargs
= old_op
->nargs
;
249 op
= tcg_op_insert_after(tcg_ctx
, op
, old_op
->opc
, nargs
);
250 memcpy(op
->args
, old_op
->args
, sizeof(op
->args
[0]) * nargs
);
255 static TCGOp
*copy_op(TCGOp
**begin_op
, TCGOp
*op
, TCGOpcode opc
)
257 op
= copy_op_nocheck(begin_op
, op
);
258 tcg_debug_assert((*begin_op
)->opc
== opc
);
262 static TCGOp
*copy_const_ptr(TCGOp
**begin_op
, TCGOp
*op
, void *ptr
)
264 if (UINTPTR_MAX
== UINT32_MAX
) {
266 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
267 op
->args
[1] = tcgv_i32_arg(tcg_constant_i32((uintptr_t)ptr
));
270 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
271 op
->args
[1] = tcgv_i64_arg(tcg_constant_i64((uintptr_t)ptr
));
276 static TCGOp
*copy_ld_i64(TCGOp
**begin_op
, TCGOp
*op
)
278 if (TCG_TARGET_REG_BITS
== 32) {
280 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
281 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
284 op
= copy_op(begin_op
, op
, INDEX_op_ld_i64
);
289 static TCGOp
*copy_st_i64(TCGOp
**begin_op
, TCGOp
*op
)
291 if (TCG_TARGET_REG_BITS
== 32) {
293 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
294 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
297 op
= copy_op(begin_op
, op
, INDEX_op_st_i64
);
302 static TCGOp
*copy_add_i64(TCGOp
**begin_op
, TCGOp
*op
, uint64_t v
)
304 if (TCG_TARGET_REG_BITS
== 32) {
305 /* all 32-bit backends must implement add2_i32 */
306 g_assert(TCG_TARGET_HAS_add2_i32
);
307 op
= copy_op(begin_op
, op
, INDEX_op_add2_i32
);
308 op
->args
[4] = tcgv_i32_arg(tcg_constant_i32(v
));
309 op
->args
[5] = tcgv_i32_arg(tcg_constant_i32(v
>> 32));
311 op
= copy_op(begin_op
, op
, INDEX_op_add_i64
);
312 op
->args
[2] = tcgv_i64_arg(tcg_constant_i64(v
));
317 static TCGOp
*copy_st_ptr(TCGOp
**begin_op
, TCGOp
*op
)
319 if (UINTPTR_MAX
== UINT32_MAX
) {
321 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
324 op
= copy_st_i64(begin_op
, op
);
329 static TCGOp
*copy_call(TCGOp
**begin_op
, TCGOp
*op
, void *empty_func
,
330 void *func
, int *cb_idx
)
335 /* copy all ops until the call */
337 op
= copy_op_nocheck(begin_op
, op
);
338 } while (op
->opc
!= INDEX_op_call
);
340 /* fill in the op call */
342 TCGOP_CALLI(op
) = TCGOP_CALLI(old_op
);
343 TCGOP_CALLO(op
) = TCGOP_CALLO(old_op
);
344 tcg_debug_assert(op
->life
== 0);
346 func_idx
= TCGOP_CALLO(op
) + TCGOP_CALLI(op
);
348 op
->args
[func_idx
] = (uintptr_t)func
;
354 * When we append/replace ops here we are sensitive to changing patterns of
355 * TCGOps generated by the tcg_gen_FOO calls when we generated the
356 * empty callbacks. This will assert very quickly in a debug build as
357 * we assert the ops we are replacing are the correct ones.
359 static TCGOp
*append_udata_cb(const struct qemu_plugin_dyn_cb
*cb
,
360 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
363 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
365 /* copy the ld_i32, but note that we only have to copy it once */
367 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
369 begin_op
= QTAILQ_NEXT(begin_op
, link
);
370 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
374 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_udata_cb
),
375 cb
->f
.vcpu_udata
, cb_idx
);
380 static TCGOp
*append_inline_cb(const struct qemu_plugin_dyn_cb
*cb
,
381 TCGOp
*begin_op
, TCGOp
*op
,
385 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
388 op
= copy_ld_i64(&begin_op
, op
);
391 op
= copy_add_i64(&begin_op
, op
, cb
->inline_insn
.imm
);
394 op
= copy_st_i64(&begin_op
, op
);
399 static TCGOp
*append_mem_cb(const struct qemu_plugin_dyn_cb
*cb
,
400 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
402 enum plugin_gen_cb type
= begin_op
->args
[1];
404 tcg_debug_assert(type
== PLUGIN_GEN_CB_MEM
);
406 /* const_i32 == mov_i32 ("info", so it remains as is) */
407 op
= copy_op(&begin_op
, op
, INDEX_op_mov_i32
);
410 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
412 /* copy the ld_i32, but note that we only have to copy it once */
414 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
416 begin_op
= QTAILQ_NEXT(begin_op
, link
);
417 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
420 if (type
== PLUGIN_GEN_CB_MEM
) {
422 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_mem_cb
),
423 cb
->f
.vcpu_udata
, cb_idx
);
429 typedef TCGOp
*(*inject_fn
)(const struct qemu_plugin_dyn_cb
*cb
,
430 TCGOp
*begin_op
, TCGOp
*op
, int *intp
);
431 typedef bool (*op_ok_fn
)(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
);
433 static bool op_ok(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
438 static bool op_rw(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
443 return !!(cb
->rw
& (w
+ 1));
446 static void inject_cb_type(const GArray
*cbs
, TCGOp
*begin_op
,
447 inject_fn inject
, op_ok_fn ok
)
454 if (!cbs
|| cbs
->len
== 0) {
459 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
460 tcg_debug_assert(end_op
);
463 for (i
= 0; i
< cbs
->len
; i
++) {
464 struct qemu_plugin_dyn_cb
*cb
=
465 &g_array_index(cbs
, struct qemu_plugin_dyn_cb
, i
);
467 if (!ok(begin_op
, cb
)) {
470 op
= inject(cb
, begin_op
, op
, &cb_idx
);
472 rm_ops_range(begin_op
, end_op
);
476 inject_udata_cb(const GArray
*cbs
, TCGOp
*begin_op
)
478 inject_cb_type(cbs
, begin_op
, append_udata_cb
, op_ok
);
482 inject_inline_cb(const GArray
*cbs
, TCGOp
*begin_op
, op_ok_fn ok
)
484 inject_cb_type(cbs
, begin_op
, append_inline_cb
, ok
);
488 inject_mem_cb(const GArray
*cbs
, TCGOp
*begin_op
)
490 inject_cb_type(cbs
, begin_op
, append_mem_cb
, op_rw
);
493 /* we could change the ops in place, but we can reuse more code by copying */
494 static void inject_mem_helper(TCGOp
*begin_op
, GArray
*arr
)
496 TCGOp
*orig_op
= begin_op
;
500 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
501 tcg_debug_assert(end_op
);
504 op
= copy_const_ptr(&begin_op
, end_op
, arr
);
507 op
= copy_st_ptr(&begin_op
, op
);
509 rm_ops_range(orig_op
, end_op
);
513 * Tracking memory accesses performed from helpers requires extra work.
514 * If an instruction is emulated with helpers, we do two things:
515 * (1) copy the CB descriptors, and keep track of it so that they can be
516 * freed later on, and (2) point CPUState.plugin_mem_cbs to the descriptors, so
517 * that we can read them at run-time (i.e. when the helper executes).
518 * This run-time access is performed from qemu_plugin_vcpu_mem_cb.
520 * Note that plugin_gen_disable_mem_helpers undoes (2). Since it
521 * is possible that the code we generate after the instruction is
522 * dead, we also add checks before generating tb_exit etc.
524 static void inject_mem_enable_helper(struct qemu_plugin_tb
*ptb
,
525 struct qemu_plugin_insn
*plugin_insn
,
532 cbs
[0] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
];
533 cbs
[1] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
536 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
537 n_cbs
+= cbs
[i
]->len
;
540 plugin_insn
->mem_helper
= plugin_insn
->calls_helpers
&& n_cbs
;
541 if (likely(!plugin_insn
->mem_helper
)) {
545 ptb
->mem_helper
= true;
547 arr
= g_array_sized_new(false, false,
548 sizeof(struct qemu_plugin_dyn_cb
), n_cbs
);
550 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
551 g_array_append_vals(arr
, cbs
[i
]->data
, cbs
[i
]->len
);
554 qemu_plugin_add_dyn_cb_arr(arr
);
555 inject_mem_helper(begin_op
, arr
);
558 static void inject_mem_disable_helper(struct qemu_plugin_insn
*plugin_insn
,
561 if (likely(!plugin_insn
->mem_helper
)) {
565 inject_mem_helper(begin_op
, NULL
);
568 /* called before finishing a TB with exit_tb, goto_tb or goto_ptr */
569 void plugin_gen_disable_mem_helpers(void)
572 * We could emit the clearing unconditionally and be done. However, this can
573 * be wasteful if for instance plugins don't track memory accesses, or if
574 * most TBs don't use helpers. Instead, emit the clearing iff the TB calls
575 * helpers that might access guest memory.
577 * Note: we do not reset plugin_tb->mem_helper here; a TB might have several
578 * exit points, and we want to emit the clearing from all of them.
580 if (!tcg_ctx
->plugin_tb
->mem_helper
) {
583 tcg_gen_st_ptr(tcg_constant_ptr(NULL
), cpu_env
,
584 offsetof(CPUState
, plugin_mem_cbs
) - offsetof(ArchCPU
, env
));
587 static void plugin_gen_tb_udata(const struct qemu_plugin_tb
*ptb
,
590 inject_udata_cb(ptb
->cbs
[PLUGIN_CB_REGULAR
], begin_op
);
593 static void plugin_gen_tb_inline(const struct qemu_plugin_tb
*ptb
,
596 inject_inline_cb(ptb
->cbs
[PLUGIN_CB_INLINE
], begin_op
, op_ok
);
599 static void plugin_gen_insn_udata(const struct qemu_plugin_tb
*ptb
,
600 TCGOp
*begin_op
, int insn_idx
)
602 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
604 inject_udata_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_REGULAR
], begin_op
);
607 static void plugin_gen_insn_inline(const struct qemu_plugin_tb
*ptb
,
608 TCGOp
*begin_op
, int insn_idx
)
610 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
611 inject_inline_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_INLINE
],
615 static void plugin_gen_mem_regular(const struct qemu_plugin_tb
*ptb
,
616 TCGOp
*begin_op
, int insn_idx
)
618 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
619 inject_mem_cb(insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
], begin_op
);
622 static void plugin_gen_mem_inline(const struct qemu_plugin_tb
*ptb
,
623 TCGOp
*begin_op
, int insn_idx
)
626 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
628 cbs
= insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
629 inject_inline_cb(cbs
, begin_op
, op_rw
);
632 static void plugin_gen_enable_mem_helper(struct qemu_plugin_tb
*ptb
,
633 TCGOp
*begin_op
, int insn_idx
)
635 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
636 inject_mem_enable_helper(ptb
, insn
, begin_op
);
639 static void plugin_gen_disable_mem_helper(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
);
643 inject_mem_disable_helper(insn
, begin_op
);
646 /* #define DEBUG_PLUGIN_GEN_OPS */
647 static void pr_ops(void)
649 #ifdef DEBUG_PLUGIN_GEN_OPS
653 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
654 const char *name
= "";
655 const char *type
= "";
657 if (op
->opc
== INDEX_op_plugin_cb_start
) {
658 switch (op
->args
[0]) {
659 case PLUGIN_GEN_FROM_TB
:
662 case PLUGIN_GEN_FROM_INSN
:
665 case PLUGIN_GEN_FROM_MEM
:
668 case PLUGIN_GEN_AFTER_INSN
:
674 switch (op
->args
[1]) {
675 case PLUGIN_GEN_CB_UDATA
:
678 case PLUGIN_GEN_CB_INLINE
:
681 case PLUGIN_GEN_CB_MEM
:
684 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
685 type
= "enable mem helper";
687 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
688 type
= "disable mem helper";
694 printf("op[%2i]: %s %s %s\n", i
, tcg_op_defs
[op
->opc
].name
, name
, type
);
700 static void plugin_gen_inject(struct qemu_plugin_tb
*plugin_tb
)
707 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
709 case INDEX_op_insn_start
:
712 case INDEX_op_plugin_cb_start
:
714 enum plugin_gen_from from
= op
->args
[0];
715 enum plugin_gen_cb type
= op
->args
[1];
718 case PLUGIN_GEN_FROM_TB
:
720 g_assert(insn_idx
== -1);
723 case PLUGIN_GEN_CB_UDATA
:
724 plugin_gen_tb_udata(plugin_tb
, op
);
726 case PLUGIN_GEN_CB_INLINE
:
727 plugin_gen_tb_inline(plugin_tb
, op
);
730 g_assert_not_reached();
734 case PLUGIN_GEN_FROM_INSN
:
736 g_assert(insn_idx
>= 0);
739 case PLUGIN_GEN_CB_UDATA
:
740 plugin_gen_insn_udata(plugin_tb
, op
, insn_idx
);
742 case PLUGIN_GEN_CB_INLINE
:
743 plugin_gen_insn_inline(plugin_tb
, op
, insn_idx
);
745 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
746 plugin_gen_enable_mem_helper(plugin_tb
, op
, insn_idx
);
749 g_assert_not_reached();
753 case PLUGIN_GEN_FROM_MEM
:
755 g_assert(insn_idx
>= 0);
758 case PLUGIN_GEN_CB_MEM
:
759 plugin_gen_mem_regular(plugin_tb
, op
, insn_idx
);
761 case PLUGIN_GEN_CB_INLINE
:
762 plugin_gen_mem_inline(plugin_tb
, op
, insn_idx
);
765 g_assert_not_reached();
770 case PLUGIN_GEN_AFTER_INSN
:
772 g_assert(insn_idx
>= 0);
775 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
776 plugin_gen_disable_mem_helper(plugin_tb
, op
, insn_idx
);
779 g_assert_not_reached();
784 g_assert_not_reached();
789 /* plugins don't care about any other ops */
796 bool plugin_gen_tb_start(CPUState
*cpu
, const DisasContextBase
*db
,
801 if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS
, cpu
->plugin_mask
)) {
802 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
805 /* reset callbacks */
806 for (i
= 0; i
< PLUGIN_N_CB_SUBTYPES
; i
++) {
808 g_array_set_size(ptb
->cbs
[i
], 0);
815 ptb
->vaddr
= db
->pc_first
;
817 ptb
->haddr1
= db
->host_addr
[0];
819 ptb
->mem_only
= mem_only
;
820 ptb
->mem_helper
= false;
822 plugin_gen_empty_callback(PLUGIN_GEN_FROM_TB
);
825 tcg_ctx
->plugin_insn
= NULL
;
830 void plugin_gen_insn_start(CPUState
*cpu
, const DisasContextBase
*db
)
832 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
833 struct qemu_plugin_insn
*pinsn
;
835 pinsn
= qemu_plugin_tb_insn_get(ptb
, db
->pc_next
);
836 tcg_ctx
->plugin_insn
= pinsn
;
837 plugin_gen_empty_callback(PLUGIN_GEN_FROM_INSN
);
840 * Detect page crossing to get the new host address.
841 * Note that we skip this when haddr1 == NULL, e.g. when we're
842 * fetching instructions from a region not backed by RAM.
844 if (ptb
->haddr1
== NULL
) {
846 } else if (is_same_page(db
, db
->pc_next
)) {
847 pinsn
->haddr
= ptb
->haddr1
+ pinsn
->vaddr
- ptb
->vaddr
;
849 if (ptb
->vaddr2
== -1) {
850 ptb
->vaddr2
= TARGET_PAGE_ALIGN(db
->pc_first
);
851 get_page_addr_code_hostp(cpu
->env_ptr
, ptb
->vaddr2
, &ptb
->haddr2
);
853 pinsn
->haddr
= ptb
->haddr2
+ pinsn
->vaddr
- ptb
->vaddr2
;
857 void plugin_gen_insn_end(void)
859 plugin_gen_empty_callback(PLUGIN_GEN_AFTER_INSN
);
863 * There are cases where we never get to finalise a translation - for
864 * example a page fault during translation. As a result we shouldn't
865 * do any clean-up here and make sure things are reset in
866 * plugin_gen_tb_start.
868 void plugin_gen_tb_end(CPUState
*cpu
)
870 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
872 /* collect instrumentation requests */
873 qemu_plugin_tb_trans_cb(cpu
, ptb
);
875 /* inject the instrumentation at the appropriate places */
876 plugin_gen_inject(ptb
);