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[Qemu-devel] [PATCH v2 02/33] target/mips: Add decode_nanomips_opc() fun
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From: |
Aleksandar Markovic |
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Subject: |
[Qemu-devel] [PATCH v2 02/33] target/mips: Add decode_nanomips_opc() function |
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Date: |
Mon, 9 Jul 2018 22:50:00 +0200 |
From: Yongbok Kim <address@hidden>
Add body and invocation of decode_nanomips_opc() if bit
ISA_NANOMIPS32 is set in env->insn_flags.
Signed-off-by: Yongbok Kim <address@hidden>
Signed-off-by: Aleksandar Markovic <address@hidden>
Signed-off-by: Stefan Markovic <address@hidden>
---
target/mips/translate.c | 313 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 311 insertions(+), 2 deletions(-)
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 3ccf6fc..bc369eb 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -15650,7 +15650,17 @@ static int decode_micromips_opc (CPUMIPSState *env,
DisasContext *ctx)
*
*/
+/* extraction utilities */
+
+#define NANOMIPS_EXTRACT_RD(op) ((op >> 7) & 0x7)
+#define NANOMIPS_EXTRACT_RS(op) ((op >> 4) & 0x7)
+#define NANOMIPS_EXTRACT_RS2(op) uMIPS_RS(op)
+#define NANOMIPS_EXTRACT_RS1(op) ((op >> 1) & 0x7)
+#define NANOMIPS_EXTRACT_RD5(op) ((op >> 5) & 0x1f)
+#define NANOMIPS_EXTRACT_RS5(op) (op & 0x1f)
+
/* MAJOR, P16, and P32 pools opcodes */
+
enum {
NM_P_ADDIU = 0x00,
NM_ADDIUPC = 0x01,
@@ -16318,6 +16328,300 @@ enum {
NM_EVP = 0x01,
};
+
+/*
+ *
+ * nanoMIPS decoding engine
+ *
+ */
+
+static int decode_gpr_gpr3(int r)
+{
+ static const int map[] = { 16, 17, 18, 19, 4, 5, 6, 7 };
+
+ return map[r & 0x7];
+}
+
+static int decode_gpr_gpr4(int r)
+{
+ static const int map[] = { 8, 9, 10, 11, 4, 5, 6, 7,
+ 16, 17, 18, 19, 20, 21, 22, 23 };
+
+ return map[r & 0xf];
+}
+
+/* Used for 16-bit store instructions. */
+static int decode_gpr_gpr4_zero(int r)
+{
+ static const int map[] = { 8, 9, 10, 0, 4, 5, 6, 7,
+ 16, 17, 18, 19, 20, 21, 22, 23 };
+
+ return map[r & 0xf];
+}
+
+static int decode_nanomips_opc(CPUMIPSState *env, DisasContext *ctx)
+{
+ uint32_t op;
+ int rt = decode_gpr_gpr3(NANOMIPS_EXTRACT_RD(ctx->opcode));
+ int rs = decode_gpr_gpr3(NANOMIPS_EXTRACT_RS(ctx->opcode));
+ int rd = decode_gpr_gpr3(NANOMIPS_EXTRACT_RS1(ctx->opcode));
+
+ /* make sure instructions are on a halfword boundary */
+ if (ctx->base.pc_next & 0x1) {
+ env->CP0_BadVAddr = ctx->base.pc_next;
+ generate_exception_end(ctx, EXCP_AdEL);
+ return 2;
+ }
+
+ op = (ctx->opcode >> 10) & 0x3f;
+ switch (op) {
+ case NM_P16_MV:
+ {
+ int rt = NANOMIPS_EXTRACT_RD5(ctx->opcode);
+ if (rt != 0) {
+ /* MOVE */
+ int rs = NANOMIPS_EXTRACT_RS5(ctx->opcode);
+ gen_arith(ctx, OPC_ADDU, rt, rs, 0);
+ } else {
+ /* P16.RI */
+ switch ((ctx->opcode >> 3) & 0x3) {
+ case NM_P16_SYSCALL:
+ generate_exception_end(ctx, EXCP_SYSCALL);
+ break;
+ case NM_BREAK16:
+ generate_exception_end(ctx, EXCP_BREAK);
+ break;
+ case NM_SDBBP16:
+ if (is_uhi(extract32(ctx->opcode, 0, 3))) {
+ gen_helper_do_semihosting(cpu_env);
+ } else {
+ if (ctx->hflags & MIPS_HFLAG_SBRI) {
+ generate_exception_end(ctx, EXCP_RI);
+ } else {
+ generate_exception_end(ctx, EXCP_DBp);
+ }
+ }
+ break;
+ default:
+ generate_exception_end(ctx, EXCP_RI);
+ break;
+ }
+ }
+ }
+ break;
+ case NM_P16_SHIFT:
+ {
+ int shift = (ctx->opcode) & 0x7;
+ uint32_t opc = 0;
+ shift = (shift == 0) ? 8 : shift;
+
+ switch ((ctx->opcode >> 3) & 1) {
+ case NM_SLL16:
+ opc = OPC_SLL;
+ break;
+ case NM_SRL16:
+ opc = OPC_SRL;
+ break;
+ }
+ gen_shift_imm(ctx, opc, rt, rs, shift);
+ }
+ break;
+ case NM_P16C:
+ break;
+ case NM_P16_A1:
+ switch ((ctx->opcode >> 6) & 1) {
+ case NM_ADDIUR1SP:
+ gen_arith_imm(ctx, OPC_ADDIU, rt, 29,
+ extract32(ctx->opcode, 0, 6) << 2);
+ break;
+ default:
+ generate_exception_end(ctx, EXCP_RI);
+ break;
+ }
+ break;
+ case NM_P16_A2:
+ switch ((ctx->opcode >> 3) & 1) {
+ case NM_ADDIUR2:
+ {
+ uint8_t u = (uint8_t) extract32(ctx->opcode, 0, 3) << 2;
+ gen_arith_imm(ctx, OPC_ADDIU, rt, rs, u);
+ }
+ break;
+ case NM_P_ADDIURS5:
+ {
+ int rt = extract32(ctx->opcode, 5, 5);
+ if (rt != 0) {
+ int s = (sextract32(ctx->opcode, 4, 1) << 3) |
+ extract32(ctx->opcode, 0, 3);
+ /* s = sign_extend( s[3] . s[2:0] , from_nbits = 4)*/
+ gen_arith_imm(ctx, OPC_ADDIU, rt, rt, s);
+ }
+ }
+ break;
+ }
+ break;
+ case NM_P16_ADDU:
+ switch (ctx->opcode & 0x1) {
+ case NM_ADDU16:
+ gen_arith(ctx, OPC_ADDU, rd, rs, rt);
+ break;
+ case NM_SUBU16:
+ gen_arith(ctx, OPC_SUBU, rd, rs, rt);
+ break;
+ }
+ break;
+ case NM_P16_4X4:
+ {
+ int rt = (extract32(ctx->opcode, 9, 1) << 3) |
+ extract32(ctx->opcode, 5, 3);
+ int rs = (extract32(ctx->opcode, 4, 1) << 3) |
+ extract32(ctx->opcode, 0, 3);
+ rt = decode_gpr_gpr4(rt);
+ rs = decode_gpr_gpr4(rs);
+
+ switch (((ctx->opcode >> 7) & 0x2) | ((ctx->opcode >> 3) & 0x1)) {
+ case NM_ADDU4X4:
+ gen_arith(ctx, OPC_ADDU, rt, rs, rt);
+ break;
+ case NM_MUL4X4:
+ gen_r6_muldiv(ctx, R6_OPC_MUL, rt, rs, rt);
+ break;
+ default:
+ generate_exception_end(ctx, EXCP_RI);
+ break;
+ }
+ }
+ break;
+ case NM_LI16:
+ {
+ int imm = extract32(ctx->opcode, 0, 7);
+ imm = (imm == 0x7f ? -1 : imm);
+ if (rt != 0) {
+ tcg_gen_movi_tl(cpu_gpr[rt], imm);
+ }
+ }
+ break;
+ case NM_ANDI16:
+ {
+ uint32_t u = extract32(ctx->opcode, 0, 4);
+ u = (u == 12) ? 0xff :
+ (u == 13) ? 0xffff : u;
+ gen_logic_imm(ctx, OPC_ANDI, rt, rs, u);
+ }
+ break;
+ case NM_P16_LB:
+ break;
+ case NM_P16_LH:
+ break;
+ case NM_LW16:
+ break;
+ case NM_LWSP16:
+ break;
+ case NM_LW4X4:
+ break;
+ case NM_SW4X4:
+ break;
+ case NM_LWGP16:
+ break;
+ case NM_SWSP16:
+ break;
+ case NM_SW16:
+ break;
+ case NM_SWGP16:
+ break;
+ case NM_BC16:
+ gen_compute_branch(ctx, OPC_BEQ, 2, 0, 0,
+ (sextract32(ctx->opcode, 0, 1) << 10) |
+ (extract32(ctx->opcode, 1, 9) << 1),
+ 0);
+ break;
+ case NM_BALC16:
+ gen_compute_branch(ctx, OPC_BGEZAL, 2, 0, 0,
+ (sextract32(ctx->opcode, 0, 1) << 10) |
+ (extract32(ctx->opcode, 1, 9) << 1),
+ 0);
+ break;
+ case NM_BEQZC16:
+ case NM_BNEZC16:
+ gen_compute_branch(ctx, op == NM_BNEZC16 ? OPC_BNE : OPC_BEQ, 2,
+ rt, 0,
+ (sextract32(ctx->opcode, 0, 1) << 7) |
+ (extract32(ctx->opcode, 1, 6) << 1),
+ 0);
+ break;
+ case NM_P16_BR:
+ switch (ctx->opcode & 0xf) {
+ case 0:
+ /* P16.JRC */
+ switch ((ctx->opcode >> 4) & 1) {
+ case NM_JRC:
+ gen_compute_branch(ctx, OPC_JR, 2,
+ extract32(ctx->opcode, 5, 5), 0, 0, 0);
+ break;
+ case NM_JALRC16:
+ gen_compute_branch(ctx, OPC_JALR, 2,
+ extract32(ctx->opcode, 5, 5), 31, 0, 0);
+ break;
+ }
+ break;
+ default:
+ /* P16.BRI */
+ if (extract32(ctx->opcode, 4, 3) < extract32(ctx->opcode, 7, 3)) {
+ /* BEQC16 */
+ gen_compute_branch(ctx, OPC_BEQ, 2, rs, rt,
+ extract32(ctx->opcode, 0, 4) << 1, 0);
+ } else {
+ /* BNEC16 */
+ gen_compute_branch(ctx, OPC_BNE, 2, rs, rt,
+ extract32(ctx->opcode, 0, 4) << 1, 0);
+ }
+ break;
+ }
+ break;
+ case NM_P16_SR:
+ break;
+ case NM_MOVEP:
+ case NM_MOVEPREV:
+ {
+ static const int gpr2reg1[] = {4, 5, 6, 7};
+ static const int gpr2reg2[] = {5, 6, 7, 8};
+ int re;
+ int rd2 = extract32(ctx->opcode, 3, 1) << 1 |
+ extract32(ctx->opcode, 8, 1);
+ int r1 = gpr2reg1[rd2];
+ int r2 = gpr2reg2[rd2];
+ int r3 = extract32(ctx->opcode, 4, 1) << 3 |
+ extract32(ctx->opcode, 0, 3);
+ int r4 = extract32(ctx->opcode, 9, 1) << 3 |
+ extract32(ctx->opcode, 5, 3);
+ TCGv t0 = tcg_temp_new();
+ TCGv t1 = tcg_temp_new();
+ if (op == NM_MOVEP) {
+ rd = r1;
+ re = r2;
+ rs = decode_gpr_gpr4_zero(r3);
+ rt = decode_gpr_gpr4_zero(r4);
+ } else {
+ rd = decode_gpr_gpr4(r3);
+ re = decode_gpr_gpr4(r4);
+ rs = r1;
+ rt = r2;
+ }
+ gen_load_gpr(t0, rs);
+ gen_load_gpr(t1, rt);
+ tcg_gen_mov_tl(cpu_gpr[rd], t0);
+ tcg_gen_mov_tl(cpu_gpr[re], t1);
+ tcg_temp_free(t0);
+ tcg_temp_free(t1);
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 2;
+}
+
/* SmartMIPS extension to MIPS32 */
#if defined(TARGET_MIPS64)
@@ -21123,8 +21427,13 @@ static void mips_tr_translate_insn(DisasContextBase
*dcbase, CPUState *cs)
insn_bytes = 4;
decode_opc(env, ctx);
} else if (ctx->insn_flags & ASE_MICROMIPS) {
- ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
- insn_bytes = decode_micromips_opc(env, ctx);
+ if (env->insn_flags & ISA_NANOMIPS32) {
+ ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
+ insn_bytes = decode_nanomips_opc(env, ctx);
+ } else {
+ ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
+ insn_bytes = decode_micromips_opc(env, ctx);
+ }
} else if (ctx->insn_flags & ASE_MIPS16) {
ctx->opcode = cpu_lduw_code(env, ctx->base.pc_next);
insn_bytes = decode_mips16_opc(env, ctx);
--
2.7.4
- [Qemu-devel] [PATCH v2 00/33] Add nanoMIPS support to QEMU, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 01/33] target/mips: Add nanoMIPS OPCODE table, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 02/33] target/mips: Add decode_nanomips_opc() function,
Aleksandar Markovic <=
- [Qemu-devel] [PATCH v2 03/33] target/mips: Add emulation of nanoMIPS 16-bit load and store instructions, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 04/33] target/mips: Add emulation of nanoMIPS 16-bit logic instructions, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 05/33] target/mips: Add emulation of nanoMIPS 16-bit save and restore instructions, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 06/33] target/mips: Add emulation of some common nanoMIPS 32-bit instructions, Aleksandar Markovic, 2018/07/09
- [Qemu-devel] [PATCH v2 07/33] target/mips: Add emulation of nanoMIPS 48-bit instructions, Aleksandar Markovic, 2018/07/09