Add moxie disassembler

Signed-off-by: Anthony Green <green@moxielogic.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 360 insertions, 0 deletions

diff --git a/disas/moxie.c b/disas/moxie.c
new file mode 100644
index 0000000000..4c5f18047d
--- /dev/null
+++ b/disas/moxie.c
@@ -0,0 +1,360 @@
+/* Disassemble moxie instructions.
+   Copyright (c) 2009  Free Software Foundation, Inc.
+
+   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 <stdio.h>
+#define STATIC_TABLE
+#define DEFINE_TABLE
+
+#include "disas/bfd.h"
+
+static void *stream;
+
+/* Form 1 instructions come in different flavors:
+
+   Some have no arguments                          (MOXIE_F1_NARG)
+   Some only use the A operand                     (MOXIE_F1_A)
+   Some use A and B registers                      (MOXIE_F1_AB)
+   Some use A and consume a 4 byte immediate value (MOXIE_F1_A4)
+   Some use just a 4 byte immediate value          (MOXIE_F1_4)
+   Some use just a 4 byte memory address           (MOXIE_F1_M)
+   Some use B and an indirect A                    (MOXIE_F1_AiB)
+   Some use A and an indirect B                    (MOXIE_F1_ABi)
+   Some consume a 4 byte immediate value and use X (MOXIE_F1_4A)
+   Some use B and an indirect A plus 4 bytes       (MOXIE_F1_AiB4)
+   Some use A and an indirect B plus 4 bytes       (MOXIE_F1_ABi4)
+
+   Form 2 instructions also come in different flavors:
+
+   Some have no arguments                          (MOXIE_F2_NARG)
+   Some use the A register and an 8-bit value      (MOXIE_F2_A8V)
+
+   Form 3 instructions also come in different flavors:
+
+   Some have no arguments                          (MOXIE_F3_NARG)
+   Some have a 10-bit PC relative operand          (MOXIE_F3_PCREL).  */
+
+#define MOXIE_F1_NARG 0x100
+#define MOXIE_F1_A    0x101
+#define MOXIE_F1_AB   0x102
+/* #define MOXIE_F1_ABC  0x103 */
+#define MOXIE_F1_A4   0x104
+#define MOXIE_F1_4    0x105
+#define MOXIE_F1_AiB  0x106
+#define MOXIE_F1_ABi  0x107
+#define MOXIE_F1_4A   0x108
+#define MOXIE_F1_AiB4 0x109
+#define MOXIE_F1_ABi4 0x10a
+#define MOXIE_F1_M    0x10b
+
+#define MOXIE_F2_NARG 0x200
+#define MOXIE_F2_A8V  0x201
+
+#define MOXIE_F3_NARG  0x300
+#define MOXIE_F3_PCREL 0x301
+
+typedef struct moxie_opc_info_t {
+    short         opcode;
+    unsigned      itype;
+    const char *  name;
+} moxie_opc_info_t;
+
+extern const moxie_opc_info_t moxie_form1_opc_info[64];
+extern const moxie_opc_info_t moxie_form2_opc_info[4];
+extern const moxie_opc_info_t moxie_form3_opc_info[16];
+
+/* The moxie processor's 16-bit instructions come in two forms:
+
+   FORM 1 instructions start with a 0 bit...
+
+   0oooooooaaaabbbb
+   0              F
+
+   ooooooo - form 1 opcode number
+   aaaa    - operand A
+   bbbb    - operand B
+
+   FORM 2 instructions start with bits "10"...
+
+   10ooaaaavvvvvvvv
+   0              F
+
+   oo       - form 2 opcode number
+   aaaa     - operand A
+   vvvvvvvv - 8-bit immediate value
+
+   FORM 3 instructions start with a bits "11"...
+
+   11oooovvvvvvvvvv
+   0              F
+
+   oooo         - form 3 opcode number
+   vvvvvvvvvv   - 10-bit immediate value.  */
+
+const moxie_opc_info_t moxie_form1_opc_info[64] =
+    {
+        { 0x00, MOXIE_F1_NARG, "nop" },
+        { 0x01, MOXIE_F1_A4,   "ldi.l" },
+        { 0x02, MOXIE_F1_AB,   "mov" },
+        { 0x03, MOXIE_F1_M,    "jsra" },
+        { 0x04, MOXIE_F1_NARG, "ret" },
+        { 0x05, MOXIE_F1_AB,   "add.l" },
+        { 0x06, MOXIE_F1_AB,   "push" },
+        { 0x07, MOXIE_F1_AB,   "pop" },
+        { 0x08, MOXIE_F1_A4,   "lda.l" },
+        { 0x09, MOXIE_F1_4A,   "sta.l" },
+        { 0x0a, MOXIE_F1_ABi,  "ld.l" },
+        { 0x0b, MOXIE_F1_AiB,  "st.l" },
+        { 0x0c, MOXIE_F1_ABi4, "ldo.l" },
+        { 0x0d, MOXIE_F1_AiB4, "sto.l" },
+        { 0x0e, MOXIE_F1_AB,   "cmp" },
+        { 0x0f, MOXIE_F1_NARG, "bad" },
+        { 0x10, MOXIE_F1_NARG, "bad" },
+        { 0x11, MOXIE_F1_NARG, "bad" },
+        { 0x12, MOXIE_F1_NARG, "bad" },
+        { 0x13, MOXIE_F1_NARG, "bad" },
+        { 0x14, MOXIE_F1_NARG, "bad" },
+        { 0x15, MOXIE_F1_NARG, "bad" },
+        { 0x16, MOXIE_F1_NARG, "bad" },
+        { 0x17, MOXIE_F1_NARG, "bad" },
+        { 0x18, MOXIE_F1_NARG, "bad" },
+        { 0x19, MOXIE_F1_A,    "jsr" },
+        { 0x1a, MOXIE_F1_M,    "jmpa" },
+        { 0x1b, MOXIE_F1_A4,   "ldi.b" },
+        { 0x1c, MOXIE_F1_ABi,  "ld.b" },
+        { 0x1d, MOXIE_F1_A4,   "lda.b" },
+        { 0x1e, MOXIE_F1_AiB,  "st.b" },
+        { 0x1f, MOXIE_F1_4A,   "sta.b" },
+        { 0x20, MOXIE_F1_A4,   "ldi.s" },
+        { 0x21, MOXIE_F1_ABi,  "ld.s" },
+        { 0x22, MOXIE_F1_A4,   "lda.s" },
+        { 0x23, MOXIE_F1_AiB,  "st.s" },
+        { 0x24, MOXIE_F1_4A,   "sta.s" },
+        { 0x25, MOXIE_F1_A,    "jmp" },
+        { 0x26, MOXIE_F1_AB,   "and" },
+        { 0x27, MOXIE_F1_AB,   "lshr" },
+        { 0x28, MOXIE_F1_AB,   "ashl" },
+        { 0x29, MOXIE_F1_AB,   "sub.l" },
+        { 0x2a, MOXIE_F1_AB,   "neg" },
+        { 0x2b, MOXIE_F1_AB,   "or" },
+        { 0x2c, MOXIE_F1_AB,   "not" },
+        { 0x2d, MOXIE_F1_AB,   "ashr" },
+        { 0x2e, MOXIE_F1_AB,   "xor" },
+        { 0x2f, MOXIE_F1_AB,   "mul.l" },
+        { 0x30, MOXIE_F1_4,    "swi" },
+        { 0x31, MOXIE_F1_AB,   "div.l" },
+        { 0x32, MOXIE_F1_AB,   "udiv.l" },
+        { 0x33, MOXIE_F1_AB,   "mod.l" },
+        { 0x34, MOXIE_F1_AB,   "umod.l" },
+        { 0x35, MOXIE_F1_NARG, "brk" },
+        { 0x36, MOXIE_F1_ABi4, "ldo.b" },
+        { 0x37, MOXIE_F1_AiB4, "sto.b" },
+        { 0x38, MOXIE_F1_ABi4, "ldo.s" },
+        { 0x39, MOXIE_F1_AiB4, "sto.s" },
+        { 0x3a, MOXIE_F1_NARG, "bad" },
+        { 0x3b, MOXIE_F1_NARG, "bad" },
+        { 0x3c, MOXIE_F1_NARG, "bad" },
+        { 0x3d, MOXIE_F1_NARG, "bad" },
+        { 0x3e, MOXIE_F1_NARG, "bad" },
+        { 0x3f, MOXIE_F1_NARG, "bad" }
+    };
+
+const moxie_opc_info_t moxie_form2_opc_info[4] =
+    {
+        { 0x00, MOXIE_F2_A8V,  "inc" },
+        { 0x01, MOXIE_F2_A8V,  "dec" },
+        { 0x02, MOXIE_F2_A8V,  "gsr" },
+        { 0x03, MOXIE_F2_A8V,  "ssr" }
+    };
+
+const moxie_opc_info_t moxie_form3_opc_info[16] =
+    {
+        { 0x00, MOXIE_F3_PCREL,"beq" },
+        { 0x01, MOXIE_F3_PCREL,"bne" },
+        { 0x02, MOXIE_F3_PCREL,"blt" },
+        { 0x03, MOXIE_F3_PCREL,"bgt" },
+        { 0x04, MOXIE_F3_PCREL,"bltu" },
+        { 0x05, MOXIE_F3_PCREL,"bgtu" },
+        { 0x06, MOXIE_F3_PCREL,"bge" },
+        { 0x07, MOXIE_F3_PCREL,"ble" },
+        { 0x08, MOXIE_F3_PCREL,"bgeu" },
+        { 0x09, MOXIE_F3_PCREL,"bleu" },
+        { 0x0a, MOXIE_F3_NARG, "bad" },
+        { 0x0b, MOXIE_F3_NARG, "bad" },
+        { 0x0c, MOXIE_F3_NARG, "bad" },
+        { 0x0d, MOXIE_F3_NARG, "bad" },
+        { 0x0e, MOXIE_F3_NARG, "bad" },
+        { 0x0f, MOXIE_F3_NARG, "bad" }
+    };
+
+/* Macros to extract operands from the instruction word.  */
+#define OP_A(i) ((i >> 4) & 0xf)
+#define OP_B(i) (i & 0xf)
+#define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1)
+
+static const char * reg_names[16] =
+    { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5",
+      "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" };
+
+int
+print_insn_moxie(bfd_vma addr, struct disassemble_info * info)
+{
+    int length = 2;
+    int status;
+    stream = info->stream;
+    const moxie_opc_info_t * opcode;
+    bfd_byte buffer[4];
+    unsigned short iword;
+    fprintf_function fpr = info->fprintf_func;
+
+    if ((status = info->read_memory_func(addr, buffer, 2, info)))
+        goto fail;
+    iword = (bfd_getb16(buffer) >> 16);
+
+    /* Form 1 instructions have the high bit set to 0.  */
+    if ((iword & (1<<15)) == 0) {
+        /* Extract the Form 1 opcode.  */
+        opcode = &moxie_form1_opc_info[iword >> 8];
+        switch (opcode->itype) {
+        case MOXIE_F1_NARG:
+            fpr(stream, "%s", opcode->name);
+            break;
+        case MOXIE_F1_A:
+            fpr(stream, "%s\t%s", opcode->name,
+                reg_names[OP_A(iword)]);
+            break;
+        case MOXIE_F1_AB:
+            fpr(stream, "%s\t%s, %s", opcode->name,
+                reg_names[OP_A(iword)],
+                reg_names[OP_B(iword)]);
+            break;
+        case MOXIE_F1_A4:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t%s, 0x%x", opcode->name,
+                    reg_names[OP_A(iword)], imm);
+                length = 6;
+            }
+            break;
+        case MOXIE_F1_4:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t0x%x", opcode->name, imm);
+                length = 6;
+            }
+            break;
+        case MOXIE_F1_M:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t", opcode->name);
+                info->print_address_func((bfd_vma) imm, info);
+                length = 6;
+            }
+            break;
+        case MOXIE_F1_AiB:
+            fpr (stream, "%s\t(%s), %s", opcode->name,
+                 reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
+            break;
+        case MOXIE_F1_ABi:
+            fpr(stream, "%s\t%s, (%s)", opcode->name,
+                reg_names[OP_A(iword)], reg_names[OP_B(iword)]);
+            break;
+        case MOXIE_F1_4A:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr + 2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t0x%x, %s",
+                    opcode->name, imm, reg_names[OP_A(iword)]);
+                length = 6;
+            }
+            break;
+        case MOXIE_F1_AiB4:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr+2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t0x%x(%s), %s", opcode->name,
+                    imm,
+                    reg_names[OP_A(iword)],
+                    reg_names[OP_B(iword)]);
+                length = 6;
+            }
+            break;
+        case MOXIE_F1_ABi4:
+            {
+                unsigned imm;
+                if ((status = info->read_memory_func(addr+2, buffer, 4, info)))
+                    goto fail;
+                imm = bfd_getb32(buffer);
+                fpr(stream, "%s\t%s, 0x%x(%s)",
+                    opcode->name,
+                    reg_names[OP_A(iword)],
+                    imm,
+                    reg_names[OP_B(iword)]);
+                length = 6;
+            }
+            break;
+        default:
+            abort();
+        }
+    }
+    else if ((iword & (1<<14)) == 0) {
+        /* Extract the Form 2 opcode.  */
+        opcode = &moxie_form2_opc_info[(iword >> 12) & 3];
+        switch (opcode->itype) {
+        case MOXIE_F2_A8V:
+            fpr(stream, "%s\t%s, 0x%x",
+                opcode->name,
+                reg_names[(iword >> 8) & 0xf],
+                iword & ((1 << 8) - 1));
+            break;
+        case MOXIE_F2_NARG:
+            fpr(stream, "%s", opcode->name);
+            break;
+        default:
+            abort();
+        }
+    } else {
+        /* Extract the Form 3 opcode.  */
+        opcode = &moxie_form3_opc_info[(iword >> 10) & 15];
+        switch (opcode->itype) {
+        case MOXIE_F3_PCREL:
+            fpr(stream, "%s\t", opcode->name);
+            info->print_address_func((bfd_vma) (addr + INST2OFFSET(iword) + 2),
+                                     info);
+            break;
+        default:
+            abort();
+        }
+    }
+
+    return length;
+
+ fail:
+    info->memory_error_func(status, addr, info);
+    return -1;
+}