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[PATCH v3 03/28] tcg: Re-order tcg_region_init vs tcg_prologue_init
From: |
Richard Henderson |
Subject: |
[PATCH v3 03/28] tcg: Re-order tcg_region_init vs tcg_prologue_init |
Date: |
Sun, 2 May 2021 16:18:19 -0700 |
Instead of delaying tcg_region_init until after tcg_prologue_init
is complete, do tcg_region_init first and let tcg_prologue_init
shrink the first region by the size of the generated prologue.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
accel/tcg/tcg-all.c | 11 ---------
accel/tcg/translate-all.c | 3 +++
bsd-user/main.c | 1 -
linux-user/main.c | 1 -
tcg/tcg.c | 52 ++++++++++++++-------------------------
5 files changed, 22 insertions(+), 46 deletions(-)
diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c
index e378c2db73..f132033999 100644
--- a/accel/tcg/tcg-all.c
+++ b/accel/tcg/tcg-all.c
@@ -111,17 +111,6 @@ static int tcg_init(MachineState *ms)
tcg_exec_init(s->tb_size * 1024 * 1024, s->splitwx_enabled);
mttcg_enabled = s->mttcg_enabled;
-
- /*
- * Initialize TCG regions only for softmmu.
- *
- * This needs to be done later for user mode, because the prologue
- * generation needs to be delayed so that GUEST_BASE is already set.
- */
-#ifndef CONFIG_USER_ONLY
- tcg_region_init();
-#endif /* !CONFIG_USER_ONLY */
-
return 0;
}
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index b12d0898d0..9841eb3fb6 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -1339,6 +1339,9 @@ void tcg_exec_init(unsigned long tb_size, int splitwx)
splitwx, &error_fatal);
assert(ok);
+ /* TODO: allocating regions is hand-in-glove with code_gen_buffer. */
+ tcg_region_init();
+
#if defined(CONFIG_SOFTMMU)
/* There's no guest base to take into account, so go ahead and
initialize the prologue now. */
diff --git a/bsd-user/main.c b/bsd-user/main.c
index 798aba512c..3669d2b89e 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -994,7 +994,6 @@ int main(int argc, char **argv)
generating the prologue until now so that the prologue can take
the real value of GUEST_BASE into account. */
tcg_prologue_init(tcg_ctx);
- tcg_region_init();
/* build Task State */
memset(ts, 0, sizeof(TaskState));
diff --git a/linux-user/main.c b/linux-user/main.c
index f956afccab..746d842b58 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -874,7 +874,6 @@ int main(int argc, char **argv, char **envp)
generating the prologue until now so that the prologue can take
the real value of GUEST_BASE into account. */
tcg_prologue_init(tcg_ctx);
- tcg_region_init();
target_cpu_copy_regs(env, regs);
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 1fbe0b686d..795a71ff25 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1209,32 +1209,18 @@ TranslationBlock *tcg_tb_alloc(TCGContext *s)
void tcg_prologue_init(TCGContext *s)
{
- size_t prologue_size, total_size;
- void *buf0, *buf1;
+ size_t prologue_size;
/* Put the prologue at the beginning of code_gen_buffer. */
- buf0 = s->code_gen_buffer;
- total_size = s->code_gen_buffer_size;
- s->code_ptr = buf0;
- s->code_buf = buf0;
+ tcg_region_assign(s, 0);
+ s->code_ptr = s->code_gen_ptr;
+ s->code_buf = s->code_gen_ptr;
s->data_gen_ptr = NULL;
- /*
- * The region trees are not yet configured, but tcg_splitwx_to_rx
- * needs the bounds for an assert.
- */
- region.start = buf0;
- region.end = buf0 + total_size;
-
#ifndef CONFIG_TCG_INTERPRETER
- tcg_qemu_tb_exec = (tcg_prologue_fn *)tcg_splitwx_to_rx(buf0);
+ tcg_qemu_tb_exec = (tcg_prologue_fn *)tcg_splitwx_to_rx(s->code_ptr);
#endif
- /* Compute a high-water mark, at which we voluntarily flush the buffer
- and start over. The size here is arbitrary, significantly larger
- than we expect the code generation for any one opcode to require. */
- s->code_gen_highwater = s->code_gen_buffer + (total_size - TCG_HIGHWATER);
-
#ifdef TCG_TARGET_NEED_POOL_LABELS
s->pool_labels = NULL;
#endif
@@ -1251,32 +1237,32 @@ void tcg_prologue_init(TCGContext *s)
}
#endif
- buf1 = s->code_ptr;
+ prologue_size = tcg_current_code_size(s);
+
#ifndef CONFIG_TCG_INTERPRETER
- flush_idcache_range((uintptr_t)tcg_splitwx_to_rx(buf0), (uintptr_t)buf0,
- tcg_ptr_byte_diff(buf1, buf0));
+ flush_idcache_range((uintptr_t)tcg_splitwx_to_rx(s->code_buf),
+ (uintptr_t)s->code_buf, prologue_size);
#endif
- /* Deduct the prologue from the buffer. */
- prologue_size = tcg_current_code_size(s);
- s->code_gen_ptr = buf1;
- s->code_gen_buffer = buf1;
- s->code_buf = buf1;
- total_size -= prologue_size;
- s->code_gen_buffer_size = total_size;
+ /* Deduct the prologue from the first region. */
+ region.start = s->code_ptr;
- tcg_register_jit(tcg_splitwx_to_rx(s->code_gen_buffer), total_size);
+ /* Recompute boundaries of the first region. */
+ tcg_region_assign(s, 0);
+
+ tcg_register_jit(tcg_splitwx_to_rx(region.start),
+ region.end - region.start);
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
FILE *logfile = qemu_log_lock();
qemu_log("PROLOGUE: [size=%zu]\n", prologue_size);
if (s->data_gen_ptr) {
- size_t code_size = s->data_gen_ptr - buf0;
+ size_t code_size = s->data_gen_ptr - s->code_gen_ptr;
size_t data_size = prologue_size - code_size;
size_t i;
- log_disas(buf0, code_size);
+ log_disas(s->code_gen_ptr, code_size);
for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
if (sizeof(tcg_target_ulong) == 8) {
@@ -1290,7 +1276,7 @@ void tcg_prologue_init(TCGContext *s)
}
}
} else {
- log_disas(buf0, prologue_size);
+ log_disas(s->code_gen_ptr, prologue_size);
}
qemu_log("\n");
qemu_log_flush();
--
2.25.1
- [PATCH v3 00/28] tcg: Clean up code_gen_buffer allocation, Richard Henderson, 2021/05/02
- [PATCH v3 01/28] meson: Split out tcg/meson.build, Richard Henderson, 2021/05/02
- [PATCH v3 03/28] tcg: Re-order tcg_region_init vs tcg_prologue_init,
Richard Henderson <=
- [PATCH v3 06/28] tcg: Split out tcg_region_prologue_set, Richard Henderson, 2021/05/02
- [PATCH v3 05/28] tcg: Split out tcg_region_initial_alloc, Richard Henderson, 2021/05/02
- [PATCH v3 02/28] meson: Split out fpu/meson.build, Richard Henderson, 2021/05/02
- [PATCH v3 04/28] tcg: Remove error return from tcg_region_initial_alloc__locked, Richard Henderson, 2021/05/02
- [PATCH v3 08/28] accel/tcg: Inline cpu_gen_init, Richard Henderson, 2021/05/02
- [PATCH v3 10/28] accel/tcg: Rename tcg_init to tcg_init_machine, Richard Henderson, 2021/05/02
- [PATCH v3 07/28] tcg: Split out region.c, Richard Henderson, 2021/05/02
- [PATCH v3 15/28] tcg: Move MAX_CODE_GEN_BUFFER_SIZE to tcg-target.h, Richard Henderson, 2021/05/02
- [PATCH v3 11/28] tcg: Create tcg_init, Richard Henderson, 2021/05/02
- [PATCH v3 18/28] tcg: Tidy tcg_n_regions, Richard Henderson, 2021/05/02