oasm: Add initial codegen emit sources

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 112 insertions, 0 deletions

diff --git a/usr.bin/oasm/include/oasm/emit.h b/usr.bin/oasm/include/oasm/emit.h
new file mode 100644
index 0000000..e4ed83c
--- /dev/null
+++ b/usr.bin/oasm/include/oasm/emit.h
@@ -0,0 +1,109 @@
+/* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _EMIT_H_
+#define _EMIT_H_
+
+#include <sys/queue.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <oasm/lex.h>
+#include <oasm/state.h>
+
+/*
+ * The OSMX64 architecture has 32-bit instructions
+ * that are encoded in the following manner:
+ *
+ * - [0:7]: Opcode
+ * - [11:8]: Register
+ * - [31:12]: Reserved
+ *
+ * The values below define various operation
+ * codes.
+ */
+#define OSMX64_NOP      0x00    /* No-operation */
+#define OSMX64_ADD      0x01    /* Add operation */
+#define OSMX64_SUB      0x02    /* Sub operation */
+#define OSMX64_MUL      0x03    /* Multiply operation */
+#define OSMX64_DIV      0x04    /* Divide operation */
+#define OSMX64_INC      0x05    /* Increment operation */
+#define OSMX64_DEC      0x06    /* Decrement operation */
+#define OSMX64_OR       0x07    /* Bitwise OR operation */
+#define OSMX64_XOR      0x08    /* Bitwise XOR operation */
+#define OSMX64_AND      0x09    /* Bitwise AND operation */
+#define OSMX64_NOT      0x10    /* Bitwise NOT operation */
+#define OSMX64_SLL      0x11    /* Shift left logical operation */
+#define OSMX64_SRL      0x12    /* Shift right logical operation */
+#define OSMX64_MOV_IMM  0x13    /* Data move operation from IMM */
+
+/*
+ * OSMX64 register definitions
+ */
+#define OSMX64_R_X0   0x00
+#define OSMX64_R_X1   0x01
+#define OSMX64_R_X2   0x02
+#define OSMX64_R_X3   0x03
+#define OSMX64_R_X4   0x04
+#define OSMX64_R_X5   0x05
+#define OSMX64_R_X6   0x06
+#define OSMX64_R_X7   0x07
+#define OSMX64_R_X8   0x08
+#define OSMX64_R_X9   0x09
+#define OSMX64_R_X10  0x0A
+#define OSMX64_R_X11  0x0B
+#define OSMX64_R_X12  0x0C
+#define OSMX64_R_X13  0x0D
+#define OSMX64_R_X14  0x0E
+#define OSMX64_R_X15  0x0F
+#define OSMX64_R_BAD  0xFF
+
+typedef uint8_t reg_t;
+typedef uint16_t imm_t;
+
+/*
+ * OSMX64 instruction
+ */
+typedef struct {
+    uint8_t opcode;
+    uint8_t rd;
+    uint16_t imm;
+} inst_t;
+
+struct emit_state {
+    tt_t last_token;
+    uint8_t is_init : 1;
+    int out_fd;
+    TAILQ_HEAD(, oasm_token) ir;
+};
+
+int emit_init(struct emit_state *state);
+int emit_destroy(struct emit_state *state);
+int emit_process(struct oasm_state *oasm, struct emit_state *emit);
+int emit_osxm64(struct emit_state *state, struct oasm_token *tp);
+
+#endif  /* !_EMIT_H_ */
diff --git a/usr.bin/oasm/include/oasm/lex.h b/usr.bin/oasm/include/oasm/lex.h
index 2811ca3..28ad52c 100644
--- a/usr.bin/oasm/include/oasm/lex.h
+++ b/usr.bin/oasm/include/oasm/lex.h
@@ -30,6 +30,8 @@
 #ifndef _OASM_LEX_H_
 #define _OASM_LEX_H_
 
+#include <sys/queue.h>
+#include <sys/cdefs.h>
 #include <stdint.h>
 
 struct oasm_state;
@@ -115,6 +117,7 @@ struct oasm_token {
     uint8_t is_reg : 1;
     uint16_t imm;
     char *raw;
+    TAILQ_ENTRY(oasm_token) link;
 };
 
 int lex_tok(struct oasm_state *state, struct oasm_token *ttp);