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 "exec/exec-all.h"
49 #include "exec/plugin-gen.h"
50 #include "exec/translator.h"
53 # define CONFIG_SOFTMMU_GATE 1
55 # define CONFIG_SOFTMMU_GATE 0
59 * plugin_cb_start TCG op args[]:
60 * 0: enum plugin_gen_from
61 * 1: enum plugin_gen_cb
62 * 2: set to 1 for mem callback that is a write, 0 otherwise.
65 enum plugin_gen_from
{
69 PLUGIN_GEN_AFTER_INSN
,
77 PLUGIN_GEN_ENABLE_MEM_HELPER
,
78 PLUGIN_GEN_DISABLE_MEM_HELPER
,
83 * These helpers are stubs that get dynamically switched out for calls
84 * direct to the plugin if they are subscribed to.
86 void HELPER(plugin_vcpu_udata_cb
)(uint32_t cpu_index
, void *udata
)
89 void HELPER(plugin_vcpu_mem_cb
)(unsigned int vcpu_index
,
90 qemu_plugin_meminfo_t info
, uint64_t vaddr
,
94 static void do_gen_mem_cb(TCGv vaddr
, uint32_t info
)
96 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
97 TCGv_i32 meminfo
= tcg_temp_ebb_new_i32();
98 TCGv_i64 vaddr64
= tcg_temp_ebb_new_i64();
99 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
101 tcg_gen_movi_i32(meminfo
, info
);
102 tcg_gen_movi_ptr(udata
, 0);
103 tcg_gen_ld_i32(cpu_index
, cpu_env
,
104 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
105 tcg_gen_extu_tl_i64(vaddr64
, vaddr
);
107 gen_helper_plugin_vcpu_mem_cb(cpu_index
, meminfo
, vaddr64
, udata
);
109 tcg_temp_free_ptr(udata
);
110 tcg_temp_free_i64(vaddr64
);
111 tcg_temp_free_i32(meminfo
);
112 tcg_temp_free_i32(cpu_index
);
115 static void gen_empty_udata_cb(void)
117 TCGv_i32 cpu_index
= tcg_temp_ebb_new_i32();
118 TCGv_ptr udata
= tcg_temp_ebb_new_ptr();
120 tcg_gen_movi_ptr(udata
, 0);
121 tcg_gen_ld_i32(cpu_index
, cpu_env
,
122 -offsetof(ArchCPU
, env
) + offsetof(CPUState
, cpu_index
));
123 gen_helper_plugin_vcpu_udata_cb(cpu_index
, udata
);
125 tcg_temp_free_ptr(udata
);
126 tcg_temp_free_i32(cpu_index
);
130 * For now we only support addi_i64.
131 * When we support more ops, we can generate one empty inline cb for each.
133 static void gen_empty_inline_cb(void)
135 TCGv_i64 val
= tcg_temp_ebb_new_i64();
136 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
138 tcg_gen_movi_ptr(ptr
, 0);
139 tcg_gen_ld_i64(val
, ptr
, 0);
140 /* pass an immediate != 0 so that it doesn't get optimized away */
141 tcg_gen_addi_i64(val
, val
, 0xdeadface);
142 tcg_gen_st_i64(val
, ptr
, 0);
143 tcg_temp_free_ptr(ptr
);
144 tcg_temp_free_i64(val
);
147 static void gen_empty_mem_cb(TCGv addr
, uint32_t info
)
149 do_gen_mem_cb(addr
, info
);
153 * Share the same function for enable/disable. When enabling, the NULL
154 * pointer will be overwritten later.
156 static void gen_empty_mem_helper(void)
158 TCGv_ptr ptr
= tcg_temp_ebb_new_ptr();
160 tcg_gen_movi_ptr(ptr
, 0);
161 tcg_gen_st_ptr(ptr
, cpu_env
, offsetof(CPUState
, plugin_mem_cbs
) -
162 offsetof(ArchCPU
, env
));
163 tcg_temp_free_ptr(ptr
);
166 static void gen_plugin_cb_start(enum plugin_gen_from from
,
167 enum plugin_gen_cb type
, unsigned wr
)
169 tcg_gen_plugin_cb_start(from
, type
, wr
);
172 static void gen_wrapped(enum plugin_gen_from from
,
173 enum plugin_gen_cb type
, void (*func
)(void))
175 gen_plugin_cb_start(from
, type
, 0);
177 tcg_gen_plugin_cb_end();
180 static void plugin_gen_empty_callback(enum plugin_gen_from from
)
183 case PLUGIN_GEN_AFTER_INSN
:
184 gen_wrapped(from
, PLUGIN_GEN_DISABLE_MEM_HELPER
,
185 gen_empty_mem_helper
);
187 case PLUGIN_GEN_FROM_INSN
:
189 * Note: plugin_gen_inject() relies on ENABLE_MEM_HELPER being
190 * the first callback of an instruction
192 gen_wrapped(from
, PLUGIN_GEN_ENABLE_MEM_HELPER
,
193 gen_empty_mem_helper
);
195 case PLUGIN_GEN_FROM_TB
:
196 gen_wrapped(from
, PLUGIN_GEN_CB_UDATA
, gen_empty_udata_cb
);
197 gen_wrapped(from
, PLUGIN_GEN_CB_INLINE
, gen_empty_inline_cb
);
200 g_assert_not_reached();
205 void (*mem_fn
)(TCGv
, uint32_t);
206 void (*inline_fn
)(void);
209 static void gen_mem_wrapped(enum plugin_gen_cb type
,
210 const union mem_gen_fn
*f
, TCGv addr
,
211 uint32_t info
, bool is_mem
)
213 enum qemu_plugin_mem_rw rw
= get_plugin_meminfo_rw(info
);
215 gen_plugin_cb_start(PLUGIN_GEN_FROM_MEM
, type
, rw
);
217 f
->mem_fn(addr
, info
);
221 tcg_gen_plugin_cb_end();
224 void plugin_gen_empty_mem_callback(TCGv addr
, uint32_t info
)
228 fn
.mem_fn
= gen_empty_mem_cb
;
229 gen_mem_wrapped(PLUGIN_GEN_CB_MEM
, &fn
, addr
, info
, true);
231 fn
.inline_fn
= gen_empty_inline_cb
;
232 gen_mem_wrapped(PLUGIN_GEN_CB_INLINE
, &fn
, 0, info
, false);
235 static TCGOp
*find_op(TCGOp
*op
, TCGOpcode opc
)
238 if (op
->opc
== opc
) {
241 op
= QTAILQ_NEXT(op
, link
);
246 static TCGOp
*rm_ops_range(TCGOp
*begin
, TCGOp
*end
)
248 TCGOp
*ret
= QTAILQ_NEXT(end
, link
);
250 QTAILQ_REMOVE_SEVERAL(&tcg_ctx
->ops
, begin
, end
, link
);
254 /* remove all ops until (and including) plugin_cb_end */
255 static TCGOp
*rm_ops(TCGOp
*op
)
257 TCGOp
*end_op
= find_op(op
, INDEX_op_plugin_cb_end
);
259 tcg_debug_assert(end_op
);
260 return rm_ops_range(op
, end_op
);
263 static TCGOp
*copy_op_nocheck(TCGOp
**begin_op
, TCGOp
*op
)
265 TCGOp
*old_op
= QTAILQ_NEXT(*begin_op
, link
);
266 unsigned nargs
= old_op
->nargs
;
269 op
= tcg_op_insert_after(tcg_ctx
, op
, old_op
->opc
, nargs
);
270 memcpy(op
->args
, old_op
->args
, sizeof(op
->args
[0]) * nargs
);
275 static TCGOp
*copy_op(TCGOp
**begin_op
, TCGOp
*op
, TCGOpcode opc
)
277 op
= copy_op_nocheck(begin_op
, op
);
278 tcg_debug_assert((*begin_op
)->opc
== opc
);
282 static TCGOp
*copy_extu_i32_i64(TCGOp
**begin_op
, TCGOp
*op
)
284 if (TCG_TARGET_REG_BITS
== 32) {
286 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
288 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
291 op
= copy_op(begin_op
, op
, INDEX_op_extu_i32_i64
);
296 static TCGOp
*copy_mov_i64(TCGOp
**begin_op
, TCGOp
*op
)
298 if (TCG_TARGET_REG_BITS
== 32) {
300 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
301 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
304 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
309 static TCGOp
*copy_const_ptr(TCGOp
**begin_op
, TCGOp
*op
, void *ptr
)
311 if (UINTPTR_MAX
== UINT32_MAX
) {
313 op
= copy_op(begin_op
, op
, INDEX_op_mov_i32
);
314 op
->args
[1] = tcgv_i32_arg(tcg_constant_i32((uintptr_t)ptr
));
317 op
= copy_op(begin_op
, op
, INDEX_op_mov_i64
);
318 op
->args
[1] = tcgv_i64_arg(tcg_constant_i64((uintptr_t)ptr
));
323 static TCGOp
*copy_extu_tl_i64(TCGOp
**begin_op
, TCGOp
*op
)
325 if (TARGET_LONG_BITS
== 32) {
327 op
= copy_extu_i32_i64(begin_op
, op
);
330 op
= copy_mov_i64(begin_op
, op
);
335 static TCGOp
*copy_ld_i64(TCGOp
**begin_op
, TCGOp
*op
)
337 if (TCG_TARGET_REG_BITS
== 32) {
339 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
340 op
= copy_op(begin_op
, op
, INDEX_op_ld_i32
);
343 op
= copy_op(begin_op
, op
, INDEX_op_ld_i64
);
348 static TCGOp
*copy_st_i64(TCGOp
**begin_op
, TCGOp
*op
)
350 if (TCG_TARGET_REG_BITS
== 32) {
352 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
353 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
356 op
= copy_op(begin_op
, op
, INDEX_op_st_i64
);
361 static TCGOp
*copy_add_i64(TCGOp
**begin_op
, TCGOp
*op
, uint64_t v
)
363 if (TCG_TARGET_REG_BITS
== 32) {
364 /* all 32-bit backends must implement add2_i32 */
365 g_assert(TCG_TARGET_HAS_add2_i32
);
366 op
= copy_op(begin_op
, op
, INDEX_op_add2_i32
);
367 op
->args
[4] = tcgv_i32_arg(tcg_constant_i32(v
));
368 op
->args
[5] = tcgv_i32_arg(tcg_constant_i32(v
>> 32));
370 op
= copy_op(begin_op
, op
, INDEX_op_add_i64
);
371 op
->args
[2] = tcgv_i64_arg(tcg_constant_i64(v
));
376 static TCGOp
*copy_st_ptr(TCGOp
**begin_op
, TCGOp
*op
)
378 if (UINTPTR_MAX
== UINT32_MAX
) {
380 op
= copy_op(begin_op
, op
, INDEX_op_st_i32
);
383 op
= copy_st_i64(begin_op
, op
);
388 static TCGOp
*copy_call(TCGOp
**begin_op
, TCGOp
*op
, void *empty_func
,
389 void *func
, int *cb_idx
)
394 /* copy all ops until the call */
396 op
= copy_op_nocheck(begin_op
, op
);
397 } while (op
->opc
!= INDEX_op_call
);
399 /* fill in the op call */
401 TCGOP_CALLI(op
) = TCGOP_CALLI(old_op
);
402 TCGOP_CALLO(op
) = TCGOP_CALLO(old_op
);
403 tcg_debug_assert(op
->life
== 0);
405 func_idx
= TCGOP_CALLO(op
) + TCGOP_CALLI(op
);
407 op
->args
[func_idx
] = (uintptr_t)func
;
413 * When we append/replace ops here we are sensitive to changing patterns of
414 * TCGOps generated by the tcg_gen_FOO calls when we generated the
415 * empty callbacks. This will assert very quickly in a debug build as
416 * we assert the ops we are replacing are the correct ones.
418 static TCGOp
*append_udata_cb(const struct qemu_plugin_dyn_cb
*cb
,
419 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
422 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
424 /* copy the ld_i32, but note that we only have to copy it once */
426 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
428 begin_op
= QTAILQ_NEXT(begin_op
, link
);
429 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
433 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_udata_cb
),
434 cb
->f
.vcpu_udata
, cb_idx
);
439 static TCGOp
*append_inline_cb(const struct qemu_plugin_dyn_cb
*cb
,
440 TCGOp
*begin_op
, TCGOp
*op
,
444 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
447 op
= copy_ld_i64(&begin_op
, op
);
450 op
= copy_add_i64(&begin_op
, op
, cb
->inline_insn
.imm
);
453 op
= copy_st_i64(&begin_op
, op
);
458 static TCGOp
*append_mem_cb(const struct qemu_plugin_dyn_cb
*cb
,
459 TCGOp
*begin_op
, TCGOp
*op
, int *cb_idx
)
461 enum plugin_gen_cb type
= begin_op
->args
[1];
463 tcg_debug_assert(type
== PLUGIN_GEN_CB_MEM
);
465 /* const_i32 == mov_i32 ("info", so it remains as is) */
466 op
= copy_op(&begin_op
, op
, INDEX_op_mov_i32
);
469 op
= copy_const_ptr(&begin_op
, op
, cb
->userp
);
471 /* copy the ld_i32, but note that we only have to copy it once */
473 op
= copy_op(&begin_op
, op
, INDEX_op_ld_i32
);
475 begin_op
= QTAILQ_NEXT(begin_op
, link
);
476 tcg_debug_assert(begin_op
&& begin_op
->opc
== INDEX_op_ld_i32
);
480 op
= copy_extu_tl_i64(&begin_op
, op
);
482 if (type
== PLUGIN_GEN_CB_MEM
) {
484 op
= copy_call(&begin_op
, op
, HELPER(plugin_vcpu_mem_cb
),
485 cb
->f
.vcpu_udata
, cb_idx
);
491 typedef TCGOp
*(*inject_fn
)(const struct qemu_plugin_dyn_cb
*cb
,
492 TCGOp
*begin_op
, TCGOp
*op
, int *intp
);
493 typedef bool (*op_ok_fn
)(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
);
495 static bool op_ok(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
500 static bool op_rw(const TCGOp
*op
, const struct qemu_plugin_dyn_cb
*cb
)
505 return !!(cb
->rw
& (w
+ 1));
508 static void inject_cb_type(const GArray
*cbs
, TCGOp
*begin_op
,
509 inject_fn inject
, op_ok_fn ok
)
516 if (!cbs
|| cbs
->len
== 0) {
521 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
522 tcg_debug_assert(end_op
);
525 for (i
= 0; i
< cbs
->len
; i
++) {
526 struct qemu_plugin_dyn_cb
*cb
=
527 &g_array_index(cbs
, struct qemu_plugin_dyn_cb
, i
);
529 if (!ok(begin_op
, cb
)) {
532 op
= inject(cb
, begin_op
, op
, &cb_idx
);
534 rm_ops_range(begin_op
, end_op
);
538 inject_udata_cb(const GArray
*cbs
, TCGOp
*begin_op
)
540 inject_cb_type(cbs
, begin_op
, append_udata_cb
, op_ok
);
544 inject_inline_cb(const GArray
*cbs
, TCGOp
*begin_op
, op_ok_fn ok
)
546 inject_cb_type(cbs
, begin_op
, append_inline_cb
, ok
);
550 inject_mem_cb(const GArray
*cbs
, TCGOp
*begin_op
)
552 inject_cb_type(cbs
, begin_op
, append_mem_cb
, op_rw
);
555 /* we could change the ops in place, but we can reuse more code by copying */
556 static void inject_mem_helper(TCGOp
*begin_op
, GArray
*arr
)
558 TCGOp
*orig_op
= begin_op
;
562 end_op
= find_op(begin_op
, INDEX_op_plugin_cb_end
);
563 tcg_debug_assert(end_op
);
566 op
= copy_const_ptr(&begin_op
, end_op
, arr
);
569 op
= copy_st_ptr(&begin_op
, op
);
571 rm_ops_range(orig_op
, end_op
);
575 * Tracking memory accesses performed from helpers requires extra work.
576 * If an instruction is emulated with helpers, we do two things:
577 * (1) copy the CB descriptors, and keep track of it so that they can be
578 * freed later on, and (2) point CPUState.plugin_mem_cbs to the descriptors, so
579 * that we can read them at run-time (i.e. when the helper executes).
580 * This run-time access is performed from qemu_plugin_vcpu_mem_cb.
582 * Note that plugin_gen_disable_mem_helpers undoes (2). Since it
583 * is possible that the code we generate after the instruction is
584 * dead, we also add checks before generating tb_exit etc.
586 static void inject_mem_enable_helper(struct qemu_plugin_tb
*ptb
,
587 struct qemu_plugin_insn
*plugin_insn
,
594 cbs
[0] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
];
595 cbs
[1] = plugin_insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
598 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
599 n_cbs
+= cbs
[i
]->len
;
602 plugin_insn
->mem_helper
= plugin_insn
->calls_helpers
&& n_cbs
;
603 if (likely(!plugin_insn
->mem_helper
)) {
607 ptb
->mem_helper
= true;
609 arr
= g_array_sized_new(false, false,
610 sizeof(struct qemu_plugin_dyn_cb
), n_cbs
);
612 for (i
= 0; i
< ARRAY_SIZE(cbs
); i
++) {
613 g_array_append_vals(arr
, cbs
[i
]->data
, cbs
[i
]->len
);
616 qemu_plugin_add_dyn_cb_arr(arr
);
617 inject_mem_helper(begin_op
, arr
);
620 static void inject_mem_disable_helper(struct qemu_plugin_insn
*plugin_insn
,
623 if (likely(!plugin_insn
->mem_helper
)) {
627 inject_mem_helper(begin_op
, NULL
);
630 /* called before finishing a TB with exit_tb, goto_tb or goto_ptr */
631 void plugin_gen_disable_mem_helpers(void)
634 * We could emit the clearing unconditionally and be done. However, this can
635 * be wasteful if for instance plugins don't track memory accesses, or if
636 * most TBs don't use helpers. Instead, emit the clearing iff the TB calls
637 * helpers that might access guest memory.
639 * Note: we do not reset plugin_tb->mem_helper here; a TB might have several
640 * exit points, and we want to emit the clearing from all of them.
642 if (!tcg_ctx
->plugin_tb
->mem_helper
) {
645 tcg_gen_st_ptr(tcg_constant_ptr(NULL
), cpu_env
,
646 offsetof(CPUState
, plugin_mem_cbs
) - offsetof(ArchCPU
, env
));
649 static void plugin_gen_tb_udata(const struct qemu_plugin_tb
*ptb
,
652 inject_udata_cb(ptb
->cbs
[PLUGIN_CB_REGULAR
], begin_op
);
655 static void plugin_gen_tb_inline(const struct qemu_plugin_tb
*ptb
,
658 inject_inline_cb(ptb
->cbs
[PLUGIN_CB_INLINE
], begin_op
, op_ok
);
661 static void plugin_gen_insn_udata(const struct qemu_plugin_tb
*ptb
,
662 TCGOp
*begin_op
, int insn_idx
)
664 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
666 inject_udata_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_REGULAR
], begin_op
);
669 static void plugin_gen_insn_inline(const struct qemu_plugin_tb
*ptb
,
670 TCGOp
*begin_op
, int insn_idx
)
672 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
673 inject_inline_cb(insn
->cbs
[PLUGIN_CB_INSN
][PLUGIN_CB_INLINE
],
677 static void plugin_gen_mem_regular(const struct qemu_plugin_tb
*ptb
,
678 TCGOp
*begin_op
, int insn_idx
)
680 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
681 inject_mem_cb(insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_REGULAR
], begin_op
);
684 static void plugin_gen_mem_inline(const struct qemu_plugin_tb
*ptb
,
685 TCGOp
*begin_op
, int insn_idx
)
688 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
690 cbs
= insn
->cbs
[PLUGIN_CB_MEM
][PLUGIN_CB_INLINE
];
691 inject_inline_cb(cbs
, begin_op
, op_rw
);
694 static void plugin_gen_enable_mem_helper(struct qemu_plugin_tb
*ptb
,
695 TCGOp
*begin_op
, int insn_idx
)
697 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
698 inject_mem_enable_helper(ptb
, insn
, begin_op
);
701 static void plugin_gen_disable_mem_helper(struct qemu_plugin_tb
*ptb
,
702 TCGOp
*begin_op
, int insn_idx
)
704 struct qemu_plugin_insn
*insn
= g_ptr_array_index(ptb
->insns
, insn_idx
);
705 inject_mem_disable_helper(insn
, begin_op
);
708 /* #define DEBUG_PLUGIN_GEN_OPS */
709 static void pr_ops(void)
711 #ifdef DEBUG_PLUGIN_GEN_OPS
715 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
716 const char *name
= "";
717 const char *type
= "";
719 if (op
->opc
== INDEX_op_plugin_cb_start
) {
720 switch (op
->args
[0]) {
721 case PLUGIN_GEN_FROM_TB
:
724 case PLUGIN_GEN_FROM_INSN
:
727 case PLUGIN_GEN_FROM_MEM
:
730 case PLUGIN_GEN_AFTER_INSN
:
736 switch (op
->args
[1]) {
737 case PLUGIN_GEN_CB_UDATA
:
740 case PLUGIN_GEN_CB_INLINE
:
743 case PLUGIN_GEN_CB_MEM
:
746 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
747 type
= "enable mem helper";
749 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
750 type
= "disable mem helper";
756 printf("op[%2i]: %s %s %s\n", i
, tcg_op_defs
[op
->opc
].name
, name
, type
);
762 static void plugin_gen_inject(struct qemu_plugin_tb
*plugin_tb
)
769 QTAILQ_FOREACH(op
, &tcg_ctx
->ops
, link
) {
771 case INDEX_op_insn_start
:
774 case INDEX_op_plugin_cb_start
:
776 enum plugin_gen_from from
= op
->args
[0];
777 enum plugin_gen_cb type
= op
->args
[1];
780 case PLUGIN_GEN_FROM_TB
:
782 g_assert(insn_idx
== -1);
785 case PLUGIN_GEN_CB_UDATA
:
786 plugin_gen_tb_udata(plugin_tb
, op
);
788 case PLUGIN_GEN_CB_INLINE
:
789 plugin_gen_tb_inline(plugin_tb
, op
);
792 g_assert_not_reached();
796 case PLUGIN_GEN_FROM_INSN
:
798 g_assert(insn_idx
>= 0);
801 case PLUGIN_GEN_CB_UDATA
:
802 plugin_gen_insn_udata(plugin_tb
, op
, insn_idx
);
804 case PLUGIN_GEN_CB_INLINE
:
805 plugin_gen_insn_inline(plugin_tb
, op
, insn_idx
);
807 case PLUGIN_GEN_ENABLE_MEM_HELPER
:
808 plugin_gen_enable_mem_helper(plugin_tb
, op
, insn_idx
);
811 g_assert_not_reached();
815 case PLUGIN_GEN_FROM_MEM
:
817 g_assert(insn_idx
>= 0);
820 case PLUGIN_GEN_CB_MEM
:
821 plugin_gen_mem_regular(plugin_tb
, op
, insn_idx
);
823 case PLUGIN_GEN_CB_INLINE
:
824 plugin_gen_mem_inline(plugin_tb
, op
, insn_idx
);
827 g_assert_not_reached();
832 case PLUGIN_GEN_AFTER_INSN
:
834 g_assert(insn_idx
>= 0);
837 case PLUGIN_GEN_DISABLE_MEM_HELPER
:
838 plugin_gen_disable_mem_helper(plugin_tb
, op
, insn_idx
);
841 g_assert_not_reached();
846 g_assert_not_reached();
851 /* plugins don't care about any other ops */
858 bool plugin_gen_tb_start(CPUState
*cpu
, const DisasContextBase
*db
,
863 if (test_bit(QEMU_PLUGIN_EV_VCPU_TB_TRANS
, cpu
->plugin_mask
)) {
864 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
867 /* reset callbacks */
868 for (i
= 0; i
< PLUGIN_N_CB_SUBTYPES
; i
++) {
870 g_array_set_size(ptb
->cbs
[i
], 0);
877 ptb
->vaddr
= db
->pc_first
;
879 ptb
->haddr1
= db
->host_addr
[0];
881 ptb
->mem_only
= mem_only
;
882 ptb
->mem_helper
= false;
884 plugin_gen_empty_callback(PLUGIN_GEN_FROM_TB
);
887 tcg_ctx
->plugin_insn
= NULL
;
892 void plugin_gen_insn_start(CPUState
*cpu
, const DisasContextBase
*db
)
894 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
895 struct qemu_plugin_insn
*pinsn
;
897 pinsn
= qemu_plugin_tb_insn_get(ptb
, db
->pc_next
);
898 tcg_ctx
->plugin_insn
= pinsn
;
899 plugin_gen_empty_callback(PLUGIN_GEN_FROM_INSN
);
902 * Detect page crossing to get the new host address.
903 * Note that we skip this when haddr1 == NULL, e.g. when we're
904 * fetching instructions from a region not backed by RAM.
906 if (ptb
->haddr1
== NULL
) {
908 } else if (is_same_page(db
, db
->pc_next
)) {
909 pinsn
->haddr
= ptb
->haddr1
+ pinsn
->vaddr
- ptb
->vaddr
;
911 if (ptb
->vaddr2
== -1) {
912 ptb
->vaddr2
= TARGET_PAGE_ALIGN(db
->pc_first
);
913 get_page_addr_code_hostp(cpu
->env_ptr
, ptb
->vaddr2
, &ptb
->haddr2
);
915 pinsn
->haddr
= ptb
->haddr2
+ pinsn
->vaddr
- ptb
->vaddr2
;
919 void plugin_gen_insn_end(void)
921 plugin_gen_empty_callback(PLUGIN_GEN_AFTER_INSN
);
925 * There are cases where we never get to finalise a translation - for
926 * example a page fault during translation. As a result we shouldn't
927 * do any clean-up here and make sure things are reset in
928 * plugin_gen_tb_start.
930 void plugin_gen_tb_end(CPUState
*cpu
)
932 struct qemu_plugin_tb
*ptb
= tcg_ctx
->plugin_tb
;
934 /* collect instrumentation requests */
935 qemu_plugin_tb_trans_cb(cpu
, ptb
);
937 /* inject the instrumentation at the appropriate places */
938 plugin_gen_inject(ptb
);