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tcg: Split out tcg_region_prologue_set 

This has only one user, but will make more sense after some
code motion.

Always leave the tcg_init_ctx initialized to the first region,
in preparation for tcg_prologue_init().  This also requires
that we don't re-allocate the region for the first cpu, lest
we hit the assertion for total number of regions allocated .

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-03-09 16:33:15 -06:00
parent 0430ca00f5
commit bf042e8e52
1 changed files with 22 additions and 15 deletions
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37
tcg/tcg.c
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@ -882,10 +882,26 @@ void tcg_region_init(void)
tcg_region_trees_init();
/* In user-mode we support only one ctx, so do the initial allocation now */
#ifdef CONFIG_USER_ONLY
tcg_region_initial_alloc__locked(tcg_ctx);
#endif
/*
* Leave the initial context initialized to the first region.
* This will be the context into which we generate the prologue.
* It is also the only context for CONFIG_USER_ONLY.
*/
tcg_region_initial_alloc__locked(&tcg_init_ctx);
}
static void tcg_region_prologue_set(TCGContext *s)
{
/* Deduct the prologue from the first region. */
g_assert(region.start == s->code_gen_buffer);
region.start = s->code_ptr;
/* Recompute boundaries of the first region. */
tcg_region_assign(s, 0);
/* Register the balance of the buffer with gdb. */
tcg_register_jit(tcg_splitwx_to_rx(region.start),
region.end - region.start);
}
#ifdef CONFIG_DEBUG_TCG
@ -965,10 +981,10 @@ void tcg_register_thread(void)
if (n > 0) {
alloc_tcg_plugin_context(s);
tcg_region_initial_alloc(s);
}
tcg_ctx = s;
tcg_region_initial_alloc(s);
}
#endif /* !CONFIG_USER_ONLY */
@ -1208,8 +1224,6 @@ void tcg_prologue_init(TCGContext *s)
{
size_t prologue_size;
/* Put the prologue at the beginning of code_gen_buffer. */
tcg_region_assign(s, 0);
s->code_ptr = s->code_gen_ptr;
s->code_buf = s->code_gen_ptr;
s->data_gen_ptr = NULL;
@ -1241,14 +1255,7 @@ void tcg_prologue_init(TCGContext *s)
(uintptr_t)s->code_buf, prologue_size);
#endif
/* Deduct the prologue from the first region. */
region.start = s->code_ptr;
/* Recompute boundaries of the first region. */
tcg_region_assign(s, 0);
tcg_register_jit(tcg_splitwx_to_rx(region.start),
region.end - region.start);
tcg_region_prologue_set(s);
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {