target-xtensa: add special and user registers

Special Registers hold the majority of the state added to the processor
by the options. See ISA, 5.3 for details.

User Registers hold state added in support of designer's TIE and in some
cases of options that Tensilica provides. See ISA, 5.4 for details.

Only registers mapped in sregnames or uregnames are considered valid.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

target-xtensa/cpu.h

@@ -99,6 +99,12 @@ enum {
     XTENSA_OPTION_TRACE_PORT,
 };
 
+enum {
+    THREADPTR = 231,
+    FCR = 232,
+    FSR = 233,
+};
+
 typedef struct XtensaConfig {
     const char *name;
     uint64_t options;
@@ -109,6 +115,7 @@ typedef struct CPUXtensaState {
     uint32_t regs[16];
     uint32_t pc;
     uint32_t sregs[256];
+    uint32_t uregs[256];
 
     CPU_COMMON
 } CPUXtensaState;

target-xtensa/translate.c

@@ -52,9 +52,20 @@ typedef struct DisasContext {
 static TCGv_ptr cpu_env;
 static TCGv_i32 cpu_pc;
 static TCGv_i32 cpu_R[16];
+static TCGv_i32 cpu_SR[256];
+static TCGv_i32 cpu_UR[256];
 
 #include "gen-icount.h"
 
+static const char * const sregnames[256] = {
+};
+
+static const char * const uregnames[256] = {
+    [THREADPTR] = "THREADPTR",
+    [FCR] = "FCR",
+    [FSR] = "FSR",
+};
+
 void xtensa_translate_init(void)
 {
     static const char * const regnames[] = {
@@ -74,6 +85,22 @@ void xtensa_translate_init(void)
                 offsetof(CPUState, regs[i]),
                 regnames[i]);
     }
+
+    for (i = 0; i < 256; ++i) {
+        if (sregnames[i]) {
+            cpu_SR[i] = tcg_global_mem_new_i32(TCG_AREG0,
+                    offsetof(CPUState, sregs[i]),
+                    sregnames[i]);
+        }
+    }
+
+    for (i = 0; i < 256; ++i) {
+        if (uregnames[i]) {
+            cpu_UR[i] = tcg_global_mem_new_i32(TCG_AREG0,
+                    offsetof(CPUState, uregs[i]),
+                    uregnames[i]);
+        }
+    }
 #define GEN_HELPER 2
 #include "helpers.h"
 }
@@ -784,9 +811,27 @@ void gen_intermediate_code_pc(CPUState *env, TranslationBlock *tb)
 void cpu_dump_state(CPUState *env, FILE *f, fprintf_function cpu_fprintf,
         int flags)
 {
-    int i;
+    int i, j;
+
+    cpu_fprintf(f, "PC=%08x\n\n", env->pc);
+
+    for (i = j = 0; i < 256; ++i) {
+        if (sregnames[i]) {
+            cpu_fprintf(f, "%s=%08x%c", sregnames[i], env->sregs[i],
+                    (j++ % 4) == 3 ? '\n' : ' ');
+        }
+    }
+
+    cpu_fprintf(f, (j % 4) == 0 ? "\n" : "\n\n");
+
+    for (i = j = 0; i < 256; ++i) {
+        if (uregnames[i]) {
+            cpu_fprintf(f, "%s=%08x%c", uregnames[i], env->uregs[i],
+                    (j++ % 4) == 3 ? '\n' : ' ');
+        }
+    }
 
-    cpu_fprintf(f, "PC=%08x\n", env->pc);
+    cpu_fprintf(f, (j % 4) == 0 ? "\n" : "\n\n");
 
     for (i = 0; i < 16; ++i) {
         cpu_fprintf(f, "A%02d=%08x%c", i, env->regs[i],