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X-Received-From: 2a00:1450:400c:c09::243 Subject: [Qemu-devel] [PATCH 1/2] tcg: Allow constant pool entries in the prologue X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent.desnogues@gmail.com, qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_6 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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. Reported-by: Laurent Desnogues Signed-off-by: Richard Henderson Tested-by: Emilio G. Cota Tested-by: Laurent Desnogues --- tcg/tcg.c | 49 ++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 42 insertions(+), 7 deletions(-) diff --git a/tcg/tcg.c b/tcg/tcg.c index 683ff4abb7..c22f1c4441 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -771,12 +771,32 @@ void tcg_prologue_init(TCGContext *s) =20 /* Put the prologue at the beginning of code_gen_buffer. */ buf0 =3D s->code_gen_buffer; + total_size =3D s->code_gen_buffer_size; s->code_ptr =3D buf0; s->code_buf =3D buf0; + s->data_gen_ptr =3D NULL; s->code_gen_prologue =3D buf0; =20 + /* 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 =3D s->code_gen_buffer + (total_size - TCG_HIGHW= ATER); + +#ifdef TCG_TARGET_NEED_POOL_LABELS + s->pool_labels =3D 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 =3D tcg_out_pool_finalize(s); + tcg_debug_assert(ok); + } +#endif + buf1 =3D s->code_ptr; flush_icache_range((uintptr_t)buf0, (uintptr_t)buf1); =20 @@ -785,21 +805,36 @@ void tcg_prologue_init(TCGContext *s) s->code_gen_ptr =3D buf1; s->code_gen_buffer =3D buf1; s->code_buf =3D buf1; - total_size =3D s->code_gen_buffer_size - prologue_size; + total_size -=3D prologue_size; s->code_gen_buffer_size =3D total_size; =20 - /* 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 =3D s->code_gen_buffer + (total_size - TCG_HIGHW= ATER); - tcg_register_jit(s->code_gen_buffer, total_size); =20 #ifdef DEBUG_DISAS if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) { qemu_log_lock(); qemu_log("PROLOGUE: [size=3D%zu]\n", prologue_size); - log_disas(buf0, prologue_size); + if (s->data_gen_ptr) { + size_t code_size =3D s->data_gen_ptr - buf0; + size_t data_size =3D prologue_size - code_size; + size_t i; + + log_disas(buf0, code_size); + + for (i =3D 0; i < data_size; i +=3D sizeof(tcg_target_ulong)) { + if (sizeof(tcg_target_ulong) =3D=3D 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(); --=20 2.13.6