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tcg: Allow constant pool entries in the prologue

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Both ARMv6 and AArch64 currently may drop complex guest_base values
into the constant pool.  But generic code wasn't expecting that, and
the pool is not emitted.  Correct that.

Tested-by: Emilio G. Cota <cota@braap.org>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2017-10-25 07:14:20 -07:00
parent 094611b426
commit 5b38ee3161
1 changed files with 42 additions and 7 deletions
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49
tcg/tcg.c
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@ -771,12 +771,32 @@ void tcg_prologue_init(TCGContext *s)
/* 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;
s->data_gen_ptr = NULL;
s->code_gen_prologue = buf0;
/* 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
/* Generate the prologue. */
tcg_target_qemu_prologue(s);
#ifdef TCG_TARGET_NEED_POOL_LABELS
/* Allow the prologue to put e.g. guest_base into a pool entry. */
{
bool ok = tcg_out_pool_finalize(s);
tcg_debug_assert(ok);
}
#endif
buf1 = s->code_ptr;
flush_icache_range((uintptr_t)buf0, (uintptr_t)buf1);
@ -785,21 +805,36 @@ void tcg_prologue_init(TCGContext *s)
s->code_gen_ptr = buf1;
s->code_gen_buffer = buf1;
s->code_buf = buf1;
total_size = s->code_gen_buffer_size - prologue_size;
total_size -= prologue_size;
s->code_gen_buffer_size = total_size;
/* 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);
tcg_register_jit(s->code_gen_buffer, total_size);
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
qemu_log_lock();
qemu_log("PROLOGUE: [size=%zu]\n", prologue_size);
log_disas(buf0, prologue_size);
if (s->data_gen_ptr) {
size_t code_size = s->data_gen_ptr - buf0;
size_t data_size = prologue_size - code_size;
size_t i;
log_disas(buf0, code_size);
for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
if (sizeof(tcg_target_ulong) == 8) {
qemu_log("0x%08" PRIxPTR ": .quad 0x%016" PRIx64 "\n",
(uintptr_t)s->data_gen_ptr + i,
*(uint64_t *)(s->data_gen_ptr + i));
} else {
qemu_log("0x%08" PRIxPTR ": .long 0x%08x\n",
(uintptr_t)s->data_gen_ptr + i,
*(uint32_t *)(s->data_gen_ptr + i));
}
}
} else {
log_disas(buf0, prologue_size);
}
qemu_log("\n");
qemu_log_flush();
qemu_log_unlock();