MIPS FPU dynamic activation, part 1, by Herve Poussineau.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2463 c046a42c-6fe2-441c-8c8c-71466251a162

7 files changed, 65 insertions, 101 deletions

diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index 6068813dc6..21651beb0e 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -63,7 +63,6 @@ struct CPUMIPSState {
 #endif
     target_ulong HI, LO;
     uint32_t DCR; /* ? */
-#if defined(MIPS_USES_FPU)
     /* Floating point registers */
     fpr_t fpr[16];
 #define FPR(cpu, n) ((fpr_t*)&(cpu)->fpr[(n) / 2])
@@ -97,8 +96,7 @@ struct CPUMIPSState {
 #define FP_DIV0           8
 #define FP_INVALID        16
 #define FP_UNIMPLEMENTED  32
-		
-#endif
+
 #if defined(MIPS_USES_R4K_TLB)
     tlb_t tlb[MIPS_TLB_MAX];
     uint32_t tlb_in_use;
diff --git a/target-mips/exec.h b/target-mips/exec.h
index 1e9fa8e691..3815a00c42 100644
--- a/target-mips/exec.h
+++ b/target-mips/exec.h
@@ -115,12 +115,10 @@ void do_tlbwi (void);
 void do_tlbwr (void);
 void do_tlbp (void);
 void do_tlbr (void);
-#ifdef MIPS_USES_FPU
 void dump_fpu(CPUState *env);
 void fpu_dump_state(CPUState *env, FILE *f, 
                     int (*fpu_fprintf)(FILE *f, const char *fmt, ...),
                     int flags);
-#endif
 void dump_sc (void);
 void do_lwl_raw (uint32_t);
 void do_lwr_raw (uint32_t);
diff --git a/target-mips/mips-defs.h b/target-mips/mips-defs.h
index 83480c6ab4..a78bef55ec 100644
--- a/target-mips/mips-defs.h
+++ b/target-mips/mips-defs.h
@@ -45,19 +45,14 @@
    2-way Icache, 64 sets Dcache, 16 bytes Dcache line, 2-way Dcache,
    no coprocessor2 attached, no MDMX support attached,
    no performance counters, watch registers present,
-   no code compression, EJTAG present, FPU enable bit depending on
-   MIPS_USES_FPU */
-#define MIPS_CONFIG1_1                                            \
+   no code compression, EJTAG present, no FPU */
+#define MIPS_CONFIG1                                              \
 ((1 << CP0C1_M) | ((MIPS_TLB_NB - 1) << CP0C1_MMU) |              \
  (0x0 << CP0C1_IS) | (0x3 << CP0C1_IL) | (0x1 << CP0C1_IA) |      \
  (0x0 << CP0C1_DS) | (0x3 << CP0C1_DL) | (0x1 << CP0C1_DA) |      \
  (0 << CP0C1_C2) | (0 << CP0C1_MD) | (0 << CP0C1_PC) |            \
- (1 << CP0C1_WR) | (0 << CP0C1_CA) | (1 << CP0C1_EP))
-#ifdef MIPS_USES_FPU
-#define MIPS_CONFIG1  (MIPS_CONFIG1_1 | (1 << CP0C1_FP))
-#else
-#define MIPS_CONFIG1  (MIPS_CONFIG1_1 | (0 << CP0C1_FP))
-#endif
+ (1 << CP0C1_WR) | (0 << CP0C1_CA) | (1 << CP0C1_EP) |            \
+ (0 << CP0C1_FP))
 /* Have config3, no tertiary/secondary caches implemented */
 #define MIPS_CONFIG2                                              \
 ((1 << CP0C2_M))
diff --git a/target-mips/op.c b/target-mips/op.c
index 9b8dd60d9d..21795ad370 100644
--- a/target-mips/op.c
+++ b/target-mips/op.c
@@ -144,8 +144,6 @@ CALL_FROM_TB2(func, arg0, arg1);
 #include "op_template.c"
 #undef TN
 
-#ifdef MIPS_USES_FPU
-
 #define SFREG 0
 #define DFREG 0
 #include "fop_template.c"
@@ -279,8 +277,6 @@ CALL_FROM_TB2(func, arg0, arg1);
 #include "fop_template.c"
 #undef FTN
 
-#endif
-
 void op_dup_T0 (void)
 {
     T2 = T0;
@@ -924,7 +920,6 @@ void op_movz (void)
     RETURN();
 }
 
-#ifdef MIPS_USES_FPU
 void op_movf (void)
 {
     if (!(env->fcr31 & PARAM1))
@@ -938,7 +933,6 @@ void op_movt (void)
         env->gpr[PARAM2] = env->gpr[PARAM3];
     RETURN();
 }
-#endif
 
 /* Tests */
 #define OP_COND(name, cond) \
@@ -1645,8 +1639,6 @@ void op_dmtc0_errorepc (void)
     RETURN();
 }
 
-#ifdef MIPS_USES_FPU
-
 #if 0
 # define DEBUG_FPU_STATE() CALL_FROM_TB1(dump_fpu, env)
 #else
@@ -2001,7 +1993,6 @@ void op_bc1t (void)
     DEBUG_FPU_STATE();
     RETURN();
 }
-#endif /* MIPS_USES_FPU */
 
 #if defined(MIPS_USES_R4K_TLB)
 void op_tlbwi (void)
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index 2e2df38a24..a262ea6684 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -331,7 +331,6 @@ void do_mtc0_status_irqraise_debug(void)
     fprintf(logfile, "Raise pending IRQs\n");
 }
 
-#ifdef MIPS_USES_FPU
 #include "softfloat.h"
 
 void fpu_handle_exception(void)
@@ -370,7 +369,6 @@ void fpu_handle_exception(void)
     SET_FP_CAUSE(env->fcr31, 0);
 #endif
 }
-#endif /* MIPS_USES_FPU */
 
 /* TLB management */
 #if defined(MIPS_USES_R4K_TLB)
diff --git a/target-mips/op_mem.c b/target-mips/op_mem.c
index a3289793b0..823cfe8092 100644
--- a/target-mips/op_mem.c
+++ b/target-mips/op_mem.c
@@ -192,7 +192,6 @@ void glue(op_scd, MEMSUFFIX) (void)
 }
 #endif /* MIPS_HAS_MIPS64 */
 
-#ifdef MIPS_USES_FPU
 void glue(op_lwc1, MEMSUFFIX) (void)
 {
     WT0 = glue(ldl, MEMSUFFIX)(T0);
@@ -213,4 +212,3 @@ void glue(op_sdc1, MEMSUFFIX) (void)
     glue(stq, MEMSUFFIX)(T0, DT0);
     RETURN();
 }
-#endif
diff --git a/target-mips/translate.c b/target-mips/translate.c
index 7576fa3b38..5a77e906f1 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -391,8 +391,6 @@ GEN32(gen_op_load_gpr_T2, gen_op_load_gpr_T2_gpr);
 GEN32(gen_op_store_T0_gpr, gen_op_store_T0_gpr_gpr);
 GEN32(gen_op_store_T1_gpr, gen_op_store_T1_gpr_gpr);
 
-#ifdef MIPS_USES_FPU
-
 static const char *fregnames[] =
     { "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",
       "f8",  "f9",  "f10", "f11", "f12", "f13", "f14", "f15",
@@ -476,8 +474,6 @@ static inline void gen_cmp_ ## fmt(int n)                               \
 FOP_CONDS(d)
 FOP_CONDS(s)
 
-#endif /* MIPS_USES_FPU */
-
 typedef struct DisasContext {
     struct TranslationBlock *tb;
     target_ulong pc, saved_pc;
@@ -640,12 +636,10 @@ OP_LD_TABLE(bu);
 OP_ST_TABLE(b);
 OP_LD_TABLE(l);
 OP_ST_TABLE(c);
-#ifdef MIPS_USES_FPU
 OP_LD_TABLE(wc1);
 OP_ST_TABLE(wc1);
 OP_LD_TABLE(dc1);
 OP_ST_TABLE(dc1);
-#endif
 
 /* Load and store */
 static void gen_ldst (DisasContext *ctx, uint32_t opc, int rt,
@@ -794,8 +788,6 @@ static void gen_ldst (DisasContext *ctx, uint32_t opc, int rt,
     MIPS_DEBUG("%s %s, %d(%s)", opn, regnames[rt], offset, regnames[base]);
 }
 
-#ifdef MIPS_USES_FPU
-
 /* Load and store */
 static void gen_flt_ldst (DisasContext *ctx, uint32_t opc, int ft,
                       int base, int16_t offset)
@@ -843,8 +835,6 @@ static void gen_flt_ldst (DisasContext *ctx, uint32_t opc, int ft,
     MIPS_DEBUG("%s %s, %d(%s)", opn, fregnames[ft], offset, regnames[base]);
 }
 
-#endif /* MIPS_USES_FPU */
-
 /* Arithmetic with immediate operand */
 static void gen_arith_imm (DisasContext *ctx, uint32_t opc, int rt,
                            int rs, int16_t imm)
@@ -4111,8 +4101,6 @@ static void gen_cp0 (DisasContext *ctx, uint32_t opc, int rt, int rd)
     MIPS_DEBUG("%s %s %d", opn, regnames[rt], rd);
 }
 
-#ifdef MIPS_USES_FPU
-
 /* CP1 Branches (before delay slot) */
 static void gen_compute_branch1 (DisasContext *ctx, uint32_t op,
                                  int32_t offset)
@@ -4531,8 +4519,6 @@ static void gen_movci (DisasContext *ctx, int rd, int rs, int cc, int tf)
        gen_op_movt(ccbit, rd, rs);
 }
 
-#endif /* MIPS_USES_FPU */
-
 /* ISA extensions (ASEs) */
 /* MIPS16 extension to MIPS32 */
 /* SmartMIPS extension to MIPS32 */
@@ -4555,7 +4541,7 @@ static void gen_blikely(DisasContext *ctx)
     gen_set_label(l1);
 }
 
-static void decode_opc (DisasContext *ctx)
+static void decode_opc (CPUState *env, DisasContext *ctx)
 {
     int32_t offset;
     int rs, rt, rd, sa;
@@ -4631,13 +4617,15 @@ static void decode_opc (DisasContext *ctx)
             /* Treat as a noop. */
             break;
 
-#ifdef MIPS_USES_FPU
         case OPC_MOVCI:
-            gen_op_cp1_enabled();
-            gen_movci(ctx, rd, rs, (ctx->opcode >> 18) & 0x7,
-                      (ctx->opcode >> 16) & 1);
+            if (env->CP0_Config1 & (1 << CP0C1_FP)) {
+                gen_op_cp1_enabled();
+                gen_movci(ctx, rd, rs, (ctx->opcode >> 18) & 0x7,
+                          (ctx->opcode >> 16) & 1);
+            } else {
+                generate_exception(ctx, EXCP_RI);
+            }
             break;
-#endif
 
 #ifdef MIPS_HAS_MIPS64
        /* MIPS64 specific opcodes */
@@ -4868,47 +4856,47 @@ static void decode_opc (DisasContext *ctx)
     case OPC_LDC1:
     case OPC_SWC1:
     case OPC_SDC1:
-#if defined(MIPS_USES_FPU)
-        save_cpu_state(ctx, 1);
-        gen_op_cp1_enabled();
-        gen_flt_ldst(ctx, op, rt, rs, imm);
-#else
-        generate_exception_err(ctx, EXCP_CpU, 1);
-#endif
+        if (env->CP0_Config1 & (1 << CP0C1_FP)) {
+            save_cpu_state(ctx, 1);
+            gen_op_cp1_enabled();
+            gen_flt_ldst(ctx, op, rt, rs, imm);
+        } else {
+            generate_exception_err(ctx, EXCP_CpU, 1);
+        }
         break;
 
     case OPC_CP1:
-#if defined(MIPS_USES_FPU)
-        save_cpu_state(ctx, 1);
-        gen_op_cp1_enabled();
-        op1 = MASK_CP1(ctx->opcode);
-        switch (op1) {
-        case OPC_MFC1:
-        case OPC_CFC1:
-        case OPC_MTC1:
-        case OPC_CTC1:
+        if (env->CP0_Config1 & (1 << CP0C1_FP)) {
+            save_cpu_state(ctx, 1);
+            gen_op_cp1_enabled();
+            op1 = MASK_CP1(ctx->opcode);
+            switch (op1) {
+            case OPC_MFC1:
+            case OPC_CFC1:
+            case OPC_MTC1:
+            case OPC_CTC1:
 #ifdef MIPS_HAS_MIPS64
-        case OPC_DMFC1:
-        case OPC_DMTC1:
+            case OPC_DMFC1:
+            case OPC_DMTC1:
 #endif
-            gen_cp1(ctx, op1, rt, rd);
-            break;
-        case OPC_BC1:
-            gen_compute_branch1(ctx, MASK_CP1_BCOND(ctx->opcode), imm << 2);
-            return;
-        case OPC_S_FMT:
-        case OPC_D_FMT:
-        case OPC_W_FMT:
-        case OPC_L_FMT:
-            gen_farith(ctx, MASK_CP1_FUNC(ctx->opcode), rt, rd, sa);
-            break;
-        default:
-            generate_exception_err(ctx, EXCP_RI, 1);
-            break;
+                gen_cp1(ctx, op1, rt, rd);
+                break;
+            case OPC_BC1:
+                gen_compute_branch1(ctx, MASK_CP1_BCOND(ctx->opcode), imm << 2);
+                return;
+            case OPC_S_FMT:
+            case OPC_D_FMT:
+            case OPC_W_FMT:
+            case OPC_L_FMT:
+                gen_farith(ctx, MASK_CP1_FUNC(ctx->opcode), rt, rd, sa);
+                break;
+            default:
+                generate_exception_err(ctx, EXCP_RI, 1);
+                break;
+            }
+        } else {
+            generate_exception_err(ctx, EXCP_CpU, 1);
         }
-#else
-        generate_exception_err(ctx, EXCP_CpU, 1);
-#endif
         break;
 
     /* COP2.  */
@@ -4921,18 +4909,20 @@ static void decode_opc (DisasContext *ctx)
         generate_exception_err(ctx, EXCP_CpU, 2);
         break;
 
-#ifdef MIPS_USES_FPU
     case OPC_CP3:
-        gen_op_cp1_enabled();
-        op1 = MASK_CP3(ctx->opcode);
-        switch (op1) {
-        /* Not implemented */
-        default:
-            generate_exception_err(ctx, EXCP_RI, 1);
-            break;
+        if (env->CP0_Config1 & (1 << CP0C1_FP)) {
+            gen_op_cp1_enabled();
+            op1 = MASK_CP3(ctx->opcode);
+            switch (op1) {
+            /* Not implemented */
+            default:
+                generate_exception_err(ctx, EXCP_RI, 1);
+                break;
+            }
+        } else {
+            generate_exception(ctx, EXCP_RI);
         }
         break;
-#endif
 
 #ifdef MIPS_HAS_MIPS64
     /* MIPS64 opcodes */
@@ -5079,7 +5069,7 @@ int gen_intermediate_code_internal (CPUState *env, TranslationBlock *tb,
             gen_opc_instr_start[lj] = 1;
         }
         ctx.opcode = ldl_code(ctx.pc);
-        decode_opc(&ctx);
+        decode_opc(env, &ctx);
         ctx.pc += 4;
 
         if (env->singlestep_enabled)
@@ -5148,8 +5138,6 @@ int gen_intermediate_code_pc (CPUState *env, struct TranslationBlock *tb)
     return gen_intermediate_code_internal(env, tb, 1);
 }
 
-#ifdef MIPS_USES_FPU
-
 void fpu_dump_state(CPUState *env, FILE *f, 
                     int (*fpu_fprintf)(FILE *f, const char *fmt, ...),
                     int flags)
@@ -5184,8 +5172,6 @@ void dump_fpu (CPUState *env)
     }
 }
 
-#endif /* MIPS_USES_FPU */
-
 #if defined(MIPS_HAS_MIPS64) && defined(MIPS_DEBUG_SIGN_EXTENSIONS)
 /* Debug help: The architecture requires 32bit code to maintain proper
    sign-extened values on 64bit machines.  */
@@ -5248,10 +5234,8 @@ void cpu_dump_state (CPUState *env, FILE *f,
                 c0_status, env->CP0_Cause, env->CP0_EPC);
     cpu_fprintf(f, "    Config0 0x%08x Config1 0x%08x LLAddr 0x" TARGET_FMT_lx "\n",
                 env->CP0_Config0, env->CP0_Config1, env->CP0_LLAddr);
-#ifdef MIPS_USES_FPU
     if (c0_status & (1 << CP0St_CU1))
         fpu_dump_state(env, f, cpu_fprintf, flags);
-#endif
 #if defined(MIPS_HAS_MIPS64) && defined(MIPS_DEBUG_SIGN_EXTENSIONS)
     cpu_mips_check_sign_extensions(env, f, cpu_fprintf, flags);
 #endif
@@ -5295,6 +5279,10 @@ void cpu_reset (CPUMIPSState *env)
     env->CP0_EBase = 0x80000000;
     env->CP0_Config0 = MIPS_CONFIG0;
     env->CP0_Config1 = MIPS_CONFIG1;
+#ifdef MIPS_USES_FPU
+    /* basic FPU register support */
+    env->CP0_Config1 |= (1 << CP0C1_FP);
+#endif
     env->CP0_Config2 = MIPS_CONFIG2;
     env->CP0_Config3 = MIPS_CONFIG3;
     env->CP0_Status = (1 << CP0St_BEV) | (1 << CP0St_ERL);
@@ -5309,9 +5297,7 @@ void cpu_reset (CPUMIPSState *env)
     env->hflags |= MIPS_HFLAG_UM;
     env->user_mode_only = 1;
 #endif
-#ifdef MIPS_USES_FPU
-    env->fcr0 = MIPS_FCR0;	
-#endif
+    env->fcr0 = MIPS_FCR0;
     /* XXX some guesswork here, values are CPU specific */
     env->SYNCI_Step = 16;
     env->CCRes = 2;