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authorClaudio Fontana <claudio.fontana@linaro.org>2014-02-05 17:27:28 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-02-08 14:50:48 +0000
commit999b53ec8794f203964db3ecf939a3da5c4bc843 (patch)
treeb9b9a8cffdc54b2d6a6f4386396e557642b21170 /disas
parent37fd5b53ba688e2a32d3966870361e667381ca95 (diff)
downloadqemu-arm-999b53ec8794f203964db3ecf939a3da5c4bc843.tar.gz
disas: Implement disassembly output for A64
Use libvixl to implement disassembly output in debug logs for A64, for use with both AArch64 hosts and targets. Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org> [PMM: * added support for target disassembly * switched to custom QEMUDisassembler so the output format matches what QEMU expects * make sure we correctly fall back to "just print hex" if we didn't build the AArch64 disassembler because of lack of a C++ compiler * rename from 'aarch64' to 'arm-a64' because this is a disassembler for the A64 instruction set * merge aarch64.c and aarch64-cxx.cc into one C++ file * simplify the aarch64.c<->aarch64-cxx.cc interface] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'disas')
-rw-r--r--disas/Makefile.objs5
-rw-r--r--disas/arm-a64.cc87
-rw-r--r--disas/libvixl/Makefile.objs8
3 files changed, 100 insertions, 0 deletions
diff --git a/disas/Makefile.objs b/disas/Makefile.objs
index 3b1e77ace5..41c237424a 100644
--- a/disas/Makefile.objs
+++ b/disas/Makefile.objs
@@ -1,5 +1,10 @@
+
common-obj-$(CONFIG_ALPHA_DIS) += alpha.o
common-obj-$(CONFIG_ARM_DIS) += arm.o
+common-obj-$(CONFIG_ARM_A64_DIS) += arm-a64.o
+common-obj-$(CONFIG_ARM_A64_DIS) += libvixl/
+libvixldir = $(SRC_PATH)/disas/libvixl
+$(obj)/arm-a64.o: QEMU_CFLAGS += -I$(libvixldir)
common-obj-$(CONFIG_CRIS_DIS) += cris.o
common-obj-$(CONFIG_HPPA_DIS) += hppa.o
common-obj-$(CONFIG_I386_DIS) += i386.o
diff --git a/disas/arm-a64.cc b/disas/arm-a64.cc
new file mode 100644
index 0000000000..162be0c420
--- /dev/null
+++ b/disas/arm-a64.cc
@@ -0,0 +1,87 @@
+/*
+ * ARM A64 disassembly output wrapper to libvixl
+ * Copyright (c) 2013 Linaro Limited
+ * Written by Claudio Fontana
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "a64/disasm-a64.h"
+
+extern "C" {
+#include "disas/bfd.h"
+}
+
+using namespace vixl;
+
+static Decoder *vixl_decoder = NULL;
+static Disassembler *vixl_disasm = NULL;
+
+/* We don't use libvixl's PrintDisassembler because its output
+ * is a little unhelpful (trailing newlines, for example).
+ * Instead we use our own very similar variant so we have
+ * control over the format.
+ */
+class QEMUDisassembler : public Disassembler {
+public:
+ explicit QEMUDisassembler(FILE *stream) : stream_(stream) { }
+ ~QEMUDisassembler() { }
+
+protected:
+ void ProcessOutput(Instruction *instr) {
+ fprintf(stream_, "%08" PRIx32 " %s",
+ instr->InstructionBits(), GetOutput());
+ }
+
+private:
+ FILE *stream_;
+};
+
+static int vixl_is_initialized(void)
+{
+ return vixl_decoder != NULL;
+}
+
+static void vixl_init(FILE *f) {
+ vixl_decoder = new Decoder();
+ vixl_disasm = new QEMUDisassembler(f);
+ vixl_decoder->AppendVisitor(vixl_disasm);
+}
+
+#define INSN_SIZE 4
+
+/* Disassemble ARM A64 instruction. This is our only entry
+ * point from QEMU's C code.
+ */
+int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
+{
+ uint8_t bytes[INSN_SIZE];
+ uint32_t instr;
+ int status;
+
+ status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
+ if (status != 0) {
+ info->memory_error_func(status, addr, info);
+ return -1;
+ }
+
+ if (!vixl_is_initialized()) {
+ vixl_init(info->stream);
+ }
+
+ instr = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
+ vixl_decoder->Decode(reinterpret_cast<Instruction*>(&instr));
+
+ return INSN_SIZE;
+}
diff --git a/disas/libvixl/Makefile.objs b/disas/libvixl/Makefile.objs
new file mode 100644
index 0000000000..0adb3ced7b
--- /dev/null
+++ b/disas/libvixl/Makefile.objs
@@ -0,0 +1,8 @@
+libvixl_OBJS = utils.o \
+ a64/instructions-a64.o \
+ a64/decoder-a64.o \
+ a64/disasm-a64.o
+
+$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS += -I$(SRC_PATH)/disas/libvixl
+
+common-obj-$(CONFIG_ARM_A64_DIS) += $(libvixl_OBJS)