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-op.h"
48 #include "trace/mem.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 do_gen_mem_cb(TCGv vaddr
, uint32_t info
)
97 TCGv_i32 cpu_index
= tcg_temp_new_i32();
98 TCGv_i32 meminfo
= tcg_const_i32(info
);
99 TCGv_i64 vaddr64
= tcg_temp_new_i64();
100 TCGv_ptr udata
= tcg_const_ptr(NULL
);
102 tcg_gen_ld_i32(cpu_index
, cpu_env
,
103 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
104 tcg_gen_extu_tl_i64(vaddr64
, vaddr
);
106 gen_helper_plugin_vcpu_mem_cb(cpu_index
, meminfo
, vaddr64
, udata
);
108 tcg_temp_free_ptr(udata
);
109 tcg_temp_free_i64(vaddr64
);
110 tcg_temp_free_i32(meminfo
);
111 tcg_temp_free_i32(cpu_index
);
114 static void gen_empty_udata_cb(void)
116 TCGv_i32 cpu_index
= tcg_temp_new_i32();
117 TCGv_ptr udata
= tcg_const_ptr(NULL
); /* will be overwritten later */
119 tcg_gen_ld_i32(cpu_index
, cpu_env
,
120 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
121 gen_helper_plugin_vcpu_udata_cb(cpu_index
, udata
);
123 tcg_temp_free_ptr(udata
);
124 tcg_temp_free_i32(cpu_index
);
128 * For now we only support addi_i64.
129 * When we support more ops, we can generate one empty inline cb for each.
131 static void gen_empty_inline_cb(void)
133 TCGv_i64 val
= tcg_temp_new_i64();
134 TCGv_ptr ptr
= tcg_const_ptr(NULL
); /* overwritten later */
136 tcg_gen_ld_i64(val
, ptr
, 0);
137 /* pass an immediate != 0 so that it doesn't get optimized away */
138 tcg_gen_addi_i64(val
, val
, 0xdeadface);
139 tcg_gen_st_i64(val
, ptr
, 0);
140 tcg_temp_free_ptr(ptr
);
141 tcg_temp_free_i64(val
);
144 static void gen_empty_mem_cb(TCGv addr
, uint32_t info
)
146 do_gen_mem_cb(addr
, info
);
150 * Share the same function for enable/disable. When enabling, the NULL
151 * pointer will be overwritten later.
153 static void gen_empty_mem_helper(void)
157 ptr
= tcg_const_ptr(NULL
);
158 tcg_gen_st_ptr(ptr
, cpu_env
, offsetof(CPUState
, plugin_mem_cbs
) -
159 offsetof(ArchCPU
, env
));
160 tcg_temp_free_ptr(ptr
);
163 static void gen_plugin_cb_start(enum plugin_gen_from from
,
164 enum plugin_gen_cb type
, unsigned wr
)
168 tcg_gen_plugin_cb_start(from
, type
, wr
);
170 QSIMPLEQ_INSERT_TAIL(&tcg_ctx
->plugin_ops
, op
, plugin_link
);
173 static void gen_wrapped(enum plugin_gen_from from
,
174 enum plugin_gen_cb type
, void (*func
)(void))
176 gen_plugin_cb_start(from
, type
, 0);
178 tcg_gen_plugin_cb_end();
181 static void plugin_gen_empty_callback(enum plugin_gen_from from
)
184 case PLUGIN_GEN_AFTER_INSN
:
185 gen_wrapped(from
, PLUGIN_GEN_DISABLE_MEM_HELPER
,
186 gen_empty_mem_helper
);
188 case PLUGIN_GEN_FROM_INSN
:
190 * Note: plugin_gen_inject() relies on ENABLE_MEM_HELPER being
191 * the first callback of an instruction
193 gen_wrapped(from
, PLUGIN_GEN_ENABLE_MEM_HELPER
,
194 gen_empty_mem_helper
);
196 case PLUGIN_GEN_FROM_TB
:
197 gen_wrapped(from
, PLUGIN_GEN_CB_UDATA
, gen_empty_udata_cb
);
198 gen_wrapped(from
, PLUGIN_GEN_CB_INLINE
, gen_empty_inline_cb
);
201 g_assert_not_reached();
206 void (*mem_fn
)(TCGv
, uint32_t);
207 void (*inline_fn
)(void);
210 static void gen_mem_wrapped(enum plugin_gen_cb type
,
211 const union mem_gen_fn
*f
, TCGv addr
,
212 uint32_t info
, bool is_mem
)
214 int wr
= !!(info
& TRACE_MEM_ST
);
216 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, type
, wr
);
218 f
->mem_fn(addr
, info
);
222 tcg_gen_plugin_cb_end();
225 void plugin_gen_empty_mem_callback(TCGv addr
, uint32_t info
)
229 fn
.mem_fn
= gen_empty_mem_cb
;
230 gen_mem_wrapped(PLUGIN_GEN_CB_MEM
, &fn
, addr
, info
, true);
232 fn
.inline_fn
= gen_empty_inline_cb
;
233 gen_mem_wrapped(PLUGIN_GEN_CB_INLINE
, &fn
, 0, info
, false);
236 static TCGOp
*find_op(TCGOp
*op
, TCGOpcode opc
)
239 if (op
->opc
== opc
) {
242 op
= QTAILQ_NEXT(op
, link
);
247 static TCGOp
*rm_ops_range(TCGOp
*begin
, TCGOp
*end
)
249 TCGOp
*ret
= QTAILQ_NEXT(end
, link
);
251 QTAILQ_REMOVE_SEVERAL(&tcg_ctx
->ops
, begin
, end
, link
);
255 /* remove all ops until (and including) plugin_cb_end */
256 static TCGOp
*rm_ops(TCGOp
*op
)
258 TCGOp
*end_op
= find_op(op
, INDEX_op_plugin_cb_end
);
260 tcg_debug_assert(end_op
);
261 return rm_ops_range(op
, end_op
);
264 static TCGOp
*copy_op_nocheck(TCGOp
**begin_op
, TCGOp
*op
)
266 *begin_op
= QTAILQ_NEXT(*begin_op
, link
);
267 tcg_debug_assert(*begin_op
);
268 op
= tcg_op_insert_after(tcg_ctx
, op
, (*begin_op
)->opc
);
269 memcpy(op
->args
, (*begin_op
)->args
, sizeof(op
->args
));
273 static TCGOp
*copy_op(TCGOp
**begin_op
, TCGOp
*op
, TCGOpcode opc
)
275 op
= copy_op_nocheck(begin_op
, op
);
276 tcg_debug_assert((*begin_op
)->opc
== opc
);
280 static TCGOp
*copy_extu_i32_i64(TCGOp
**begin_op
, TCGOp
*op
)
282 if (TCG_TARGET_REG_BITS
== 32) {
284 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
286 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
289 op
= copy_op(begin_op
, op
, INDEX_op_extu_i32_i64
);
294 static TCGOp
*copy_mov_i64(TCGOp
**begin_op
, TCGOp
*op
)
296 if (TCG_TARGET_REG_BITS
== 32) {
298 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
299 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
302 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
307 static TCGOp
*copy_const_ptr(TCGOp
**begin_op
, TCGOp
*op
, void *ptr
)
309 if (UINTPTR_MAX
== UINT32_MAX
) {
311 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
312 op
->args
[1] = tcgv_i32_arg(tcg_constant_i32((uintptr_t)ptr
));
315 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
316 op
->args
[1] = tcgv_i64_arg(tcg_constant_i64((uintptr_t)ptr
));
321 static TCGOp
*copy_extu_tl_i64(TCGOp
**begin_op
, TCGOp
*op
)
323 if (TARGET_LONG_BITS
== 32) {
325 op
= copy_extu_i32_i64(begin_op
, op
);
328 op
= copy_mov_i64(begin_op
, op
);
333 static TCGOp
*copy_ld_i64(TCGOp
**begin_op
, TCGOp
*op
)
335 if (TCG_TARGET_REG_BITS
== 32) {
337 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
338 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
341 op
= copy_op(begin_op
, op
, INDEX_op_ld_i64
);
346 static TCGOp
*copy_st_i64(TCGOp
**begin_op
, TCGOp
*op
)
348 if (TCG_TARGET_REG_BITS
== 32) {
350 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
351 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
354 op
= copy_op(begin_op
, op
, INDEX_op_st_i64
);
359 static TCGOp
*copy_add_i64(TCGOp
**begin_op
, TCGOp
*op
, uint64_t v
)
361 if (TCG_TARGET_REG_BITS
== 32) {
362 /* all 32-bit backends must implement add2_i32 */
363 g_assert(TCG_TARGET_HAS_add2_i32
);
364 op
= copy_op(begin_op
, op
, INDEX_op_add2_i32
);
365 op
->args
[4] = tcgv_i32_arg(tcg_constant_i32(v
));
366 op
->args
[5] = tcgv_i32_arg(tcg_constant_i32(v
>> 32));
368 op
= copy_op(begin_op
, op
, INDEX_op_add_i64
);
369 op
->args
[2] = tcgv_i64_arg(tcg_constant_i64(v
));
374 static TCGOp
*copy_st_ptr(TCGOp
**begin_op
, TCGOp
*op
)
376 if (UINTPTR_MAX
== UINT32_MAX
) {
378 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
381 op
= copy_st_i64(begin_op
, op
);
386 static TCGOp
*copy_call(TCGOp
**begin_op
, TCGOp
*op
, void *empty_func
,
387 void *func
, int *cb_idx
)
389 /* copy all ops until the call */
391 op
= copy_op_nocheck(begin_op
, op
);
392 } while (op
->opc
!= INDEX_op_call
);
394 /* fill in the op call */
395 op
->param1
= (*begin_op
)->param1
;
396 op
->param2
= (*begin_op
)->param2
;
397 tcg_debug_assert(op
->life
== 0);
402 * Instead of working out the position of the callback in args[], just
403 * look for @empty_func, since it should be a unique pointer.
405 for (i
= 0; i
< MAX_OPC_PARAM_ARGS
; i
++) {
406 if ((uintptr_t)(*begin_op
)->args
[i
] == (uintptr_t)empty_func
) {
411 tcg_debug_assert(i
< MAX_OPC_PARAM_ARGS
);
413 op
->args
[*cb_idx
] = (uintptr_t)func
;
414 op
->args
[*cb_idx
+ 1] = (*begin_op
)->args
[*cb_idx
+ 1];
420 * When we append/replace ops here we are sensitive to changing patterns of
421 * TCGOps generated by the tcg_gen_FOO calls when we generated the
422 * empty callbacks. This will assert very quickly in a debug build as
423 * we assert the ops we are replacing are the correct ones.
425 static TCGOp
*append_udata_cb(const struct qemu_plugin_dyn_cb
*cb
,
426 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
429 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
431 /* copy the ld_i32, but note that we only have to copy it once */
432 begin_op
= QTAILQ_NEXT(begin_op
, link
);
433 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
435 op
= tcg_op_insert_after(tcg_ctx
, op
, INDEX_op_ld_i32
);
436 memcpy(op
->args
, begin_op
->args
, sizeof(op
->args
));
440 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_udata_cb
),
441 cb
->f
.vcpu_udata
, cb_idx
);
446 static TCGOp
*append_inline_cb(const struct qemu_plugin_dyn_cb
*cb
,
447 TCGOp
*begin_op
, TCGOp
*op
,
451 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
454 op
= copy_ld_i64(&begin_op
, op
);
457 op
= copy_add_i64(&begin_op
, op
, cb
->inline_insn
.imm
);
460 op
= copy_st_i64(&begin_op
, op
);
465 static TCGOp
*append_mem_cb(const struct qemu_plugin_dyn_cb
*cb
,
466 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
468 enum plugin_gen_cb type
= begin_op
->args
[1];
470 tcg_debug_assert(type
== PLUGIN_GEN_CB_MEM
);
472 /* const_i32 == mov_i32 ("info", so it remains as is) */
473 op
= copy_op(&begin_op
, op
, INDEX_op_mov_i32
);
476 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
478 /* copy the ld_i32, but note that we only have to copy it once */
479 begin_op
= QTAILQ_NEXT(begin_op
, link
);
480 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
482 op
= tcg_op_insert_after(tcg_ctx
, op
, INDEX_op_ld_i32
);
483 memcpy(op
->args
, begin_op
->args
, sizeof(op
->args
));
487 op
= copy_extu_tl_i64(&begin_op
, op
);
489 if (type
== PLUGIN_GEN_CB_MEM
) {
491 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_mem_cb
),
492 cb
->f
.vcpu_udata
, cb_idx
);
498 typedef TCGOp
*(*inject_fn
)(const struct qemu_plugin_dyn_cb
*cb
,
499 TCGOp
*begin_op
, TCGOp
*op
, int *intp
);
500 typedef bool (*op_ok_fn
)(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
);
502 static bool op_ok(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
507 static bool op_rw(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
512 return !!(cb
->rw
& (w
+ 1));
515 static void inject_cb_type(const GArray
*cbs
, TCGOp
*begin_op
,
516 inject_fn inject
, op_ok_fn ok
)
523 if (!cbs
|| cbs
->len
== 0) {
528 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
529 tcg_debug_assert(end_op
);
532 for (i
= 0; i
< cbs
->len
; i
++) {
533 struct qemu_plugin_dyn_cb
*cb
=
534 &g_array_index(cbs
, struct qemu_plugin_dyn_cb
, i
);
536 if (!ok(begin_op
, cb
)) {
539 op
= inject(cb
, begin_op
, op
, &cb_idx
);
541 rm_ops_range(begin_op
, end_op
);
545 inject_udata_cb(const GArray
*cbs
, TCGOp
*begin_op
)
547 inject_cb_type(cbs
, begin_op
, append_udata_cb
, op_ok
);
551 inject_inline_cb(const GArray
*cbs
, TCGOp
*begin_op
, op_ok_fn ok
)
553 inject_cb_type(cbs
, begin_op
, append_inline_cb
, ok
);
557 inject_mem_cb(const GArray
*cbs
, TCGOp
*begin_op
)
559 inject_cb_type(cbs
, begin_op
, append_mem_cb
, op_rw
);
562 /* we could change the ops in place, but we can reuse more code by copying */
563 static void inject_mem_helper(TCGOp
*begin_op
, GArray
*arr
)
565 TCGOp
*orig_op
= begin_op
;
569 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
570 tcg_debug_assert(end_op
);
573 op
= copy_const_ptr(&begin_op
, end_op
, arr
);
576 op
= copy_st_ptr(&begin_op
, op
);
578 rm_ops_range(orig_op
, end_op
);
582 * Tracking memory accesses performed from helpers requires extra work.
583 * If an instruction is emulated with helpers, we do two things:
584 * (1) copy the CB descriptors, and keep track of it so that they can be
585 * freed later on, and (2) point CPUState.plugin_mem_cbs to the descriptors, so
586 * that we can read them at run-time (i.e. when the helper executes).
587 * This run-time access is performed from qemu_plugin_vcpu_mem_cb.
589 * Note that plugin_gen_disable_mem_helpers undoes (2). Since it
590 * is possible that the code we generate after the instruction is
591 * dead, we also add checks before generating tb_exit etc.
593 static void inject_mem_enable_helper(struct qemu_plugin_insn
*plugin_insn
,
600 cbs
[0] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
];
601 cbs
[1] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
604 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
605 n_cbs
+= cbs
[i
]->len
;
608 plugin_insn
->mem_helper
= plugin_insn
->calls_helpers
&& n_cbs
;
609 if (likely(!plugin_insn
->mem_helper
)) {
614 arr
= g_array_sized_new(false, false,
615 sizeof(struct qemu_plugin_dyn_cb
), n_cbs
);
617 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
618 g_array_append_vals(arr
, cbs
[i
]->data
, cbs
[i
]->len
);
621 qemu_plugin_add_dyn_cb_arr(arr
);
622 inject_mem_helper(begin_op
, arr
);
625 static void inject_mem_disable_helper(struct qemu_plugin_insn
*plugin_insn
,
628 if (likely(!plugin_insn
->mem_helper
)) {
632 inject_mem_helper(begin_op
, NULL
);
635 /* called before finishing a TB with exit_tb, goto_tb or goto_ptr */
636 void plugin_gen_disable_mem_helpers(void)
640 if (likely(tcg_ctx
->plugin_insn
== NULL
||
641 !tcg_ctx
->plugin_insn
->mem_helper
)) {
644 ptr
= tcg_const_ptr(NULL
);
645 tcg_gen_st_ptr(ptr
, cpu_env
, offsetof(CPUState
, plugin_mem_cbs
) -
646 offsetof(ArchCPU
, env
));
647 tcg_temp_free_ptr(ptr
);
648 tcg_ctx
->plugin_insn
->mem_helper
= false;
651 static void plugin_gen_tb_udata(const struct qemu_plugin_tb
*ptb
,
654 inject_udata_cb(ptb
->cbs
[PLUGIN_CB_REGULAR
], begin_op
);
657 static void plugin_gen_tb_inline(const struct qemu_plugin_tb
*ptb
,
660 inject_inline_cb(ptb
->cbs
[PLUGIN_CB_INLINE
], begin_op
, op_ok
);
663 static void plugin_gen_insn_udata(const struct qemu_plugin_tb
*ptb
,
664 TCGOp
*begin_op
, int insn_idx
)
666 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
668 inject_udata_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_REGULAR
], begin_op
);
671 static void plugin_gen_insn_inline(const struct qemu_plugin_tb
*ptb
,
672 TCGOp
*begin_op
, int insn_idx
)
674 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
675 inject_inline_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_INLINE
],
679 static void plugin_gen_mem_regular(const 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_cb(insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
], begin_op
);
686 static void plugin_gen_mem_inline(const struct qemu_plugin_tb
*ptb
,
687 TCGOp
*begin_op
, int insn_idx
)
690 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
692 cbs
= insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
693 inject_inline_cb(cbs
, begin_op
, op_rw
);
696 static void plugin_gen_enable_mem_helper(const struct qemu_plugin_tb
*ptb
,
697 TCGOp
*begin_op
, int insn_idx
)
699 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
700 inject_mem_enable_helper(insn
, begin_op
);
703 static void plugin_gen_disable_mem_helper(const struct qemu_plugin_tb
*ptb
,
704 TCGOp
*begin_op
, int insn_idx
)
706 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
707 inject_mem_disable_helper(insn
, begin_op
);
710 static void plugin_inject_cb(const struct qemu_plugin_tb
*ptb
, TCGOp
*begin_op
,
713 enum plugin_gen_from from
= begin_op
->args
[0];
714 enum plugin_gen_cb type
= begin_op
->args
[1];
717 case PLUGIN_GEN_FROM_TB
:
719 case PLUGIN_GEN_CB_UDATA
:
720 plugin_gen_tb_udata(ptb
, begin_op
);
722 case PLUGIN_GEN_CB_INLINE
:
723 plugin_gen_tb_inline(ptb
, begin_op
);
726 g_assert_not_reached();
728 case PLUGIN_GEN_FROM_INSN
:
730 case PLUGIN_GEN_CB_UDATA
:
731 plugin_gen_insn_udata(ptb
, begin_op
, insn_idx
);
733 case PLUGIN_GEN_CB_INLINE
:
734 plugin_gen_insn_inline(ptb
, begin_op
, insn_idx
);
736 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
737 plugin_gen_enable_mem_helper(ptb
, begin_op
, insn_idx
);
740 g_assert_not_reached();
742 case PLUGIN_GEN_FROM_MEM
:
744 case PLUGIN_GEN_CB_MEM
:
745 plugin_gen_mem_regular(ptb
, begin_op
, insn_idx
);
747 case PLUGIN_GEN_CB_INLINE
:
748 plugin_gen_mem_inline(ptb
, begin_op
, insn_idx
);
751 g_assert_not_reached();
753 case PLUGIN_GEN_AFTER_INSN
:
755 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
756 plugin_gen_disable_mem_helper(ptb
, begin_op
, insn_idx
);
759 g_assert_not_reached();
762 g_assert_not_reached();
766 /* #define DEBUG_PLUGIN_GEN_OPS */
767 static void pr_ops(void)
769 #ifdef DEBUG_PLUGIN_GEN_OPS
773 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
774 const char *name
= "";
775 const char *type
= "";
777 if (op
->opc
== INDEX_op_plugin_cb_start
) {
778 switch (op
->args
[0]) {
779 case PLUGIN_GEN_FROM_TB
:
782 case PLUGIN_GEN_FROM_INSN
:
785 case PLUGIN_GEN_FROM_MEM
:
788 case PLUGIN_GEN_AFTER_INSN
:
794 switch (op
->args
[1]) {
795 case PLUGIN_GEN_CB_UDATA
:
798 case PLUGIN_GEN_CB_INLINE
:
801 case PLUGIN_GEN_CB_MEM
:
804 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
805 type
= "enable mem helper";
807 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
808 type
= "disable mem helper";
814 printf("op[%2i]: %s %s %s\n", i
, tcg_op_defs
[op
->opc
].name
, name
, type
);
820 static void plugin_gen_inject(const struct qemu_plugin_tb
*plugin_tb
)
827 QSIMPLEQ_FOREACH(op
, &tcg_ctx
->plugin_ops
, plugin_link
) {
828 enum plugin_gen_from from
= op
->args
[0];
829 enum plugin_gen_cb type
= op
->args
[1];
831 tcg_debug_assert(op
->opc
== INDEX_op_plugin_cb_start
);
832 /* ENABLE_MEM_HELPER is the first callback of an instruction */
833 if (from
== PLUGIN_GEN_FROM_INSN
&&
834 type
== PLUGIN_GEN_ENABLE_MEM_HELPER
) {
837 plugin_inject_cb(plugin_tb
, op
, insn_idx
);
842 bool plugin_gen_tb_start(CPUState
*cpu
, const TranslationBlock
*tb
, bool mem_only
)
844 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
847 if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS
, cpu
->plugin_mask
)) {
850 QSIMPLEQ_INIT(&tcg_ctx
->plugin_ops
);
853 get_page_addr_code_hostp(cpu
->env_ptr
, tb
->pc
, &ptb
->haddr1
);
855 ptb
->mem_only
= mem_only
;
857 plugin_gen_empty_callback(PLUGIN_GEN_FROM_TB
);
862 void plugin_gen_insn_start(CPUState
*cpu
, const DisasContextBase
*db
)
864 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
865 struct qemu_plugin_insn
*pinsn
;
867 pinsn
= qemu_plugin_tb_insn_get(ptb
);
868 tcg_ctx
->plugin_insn
= pinsn
;
869 pinsn
->vaddr
= db
->pc_next
;
870 plugin_gen_empty_callback(PLUGIN_GEN_FROM_INSN
);
873 * Detect page crossing to get the new host address.
874 * Note that we skip this when haddr1 == NULL, e.g. when we're
875 * fetching instructions from a region not backed by RAM.
877 if (likely(ptb
->haddr1
!= NULL
&& ptb
->vaddr2
== -1) &&
878 unlikely((db
->pc_next
& TARGET_PAGE_MASK
) !=
879 (db
->pc_first
& TARGET_PAGE_MASK
))) {
880 get_page_addr_code_hostp(cpu
->env_ptr
, db
->pc_next
,
882 ptb
->vaddr2
= db
->pc_next
;
884 if (likely(ptb
->vaddr2
== -1)) {
885 pinsn
->haddr
= ptb
->haddr1
+ pinsn
->vaddr
- ptb
->vaddr
;
887 pinsn
->haddr
= ptb
->haddr2
+ pinsn
->vaddr
- ptb
->vaddr2
;
891 void plugin_gen_insn_end(void)
893 plugin_gen_empty_callback(PLUGIN_GEN_AFTER_INSN
);
896 void plugin_gen_tb_end(CPUState
*cpu
)
898 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
901 /* collect instrumentation requests */
902 qemu_plugin_tb_trans_cb(cpu
, ptb
);
904 /* inject the instrumentation at the appropriate places */
905 plugin_gen_inject(ptb
);
908 for (i
= 0; i
< PLUGIN_N_CB_SUBTYPES
; i
++) {
910 g_array_set_size(ptb
->cbs
[i
], 0);
914 tcg_ctx
->plugin_insn
= NULL
;