cpu: Introduce CPUNegativeOffsetState

Nothing in there so far, but all of the plumbing done
within the target ArchCPU state.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/cpu-all.h

@@ -404,4 +404,28 @@ static inline CPUState *env_cpu(CPUArchState *env)
     return &env_archcpu(env)->parent_obj;
 }
 
+/**
+ * env_neg(env)
+ * @env: The architecture environment
+ *
+ * Return the CPUNegativeOffsetState associated with the environment.
+ */
+static inline CPUNegativeOffsetState *env_neg(CPUArchState *env)
+{
+    ArchCPU *arch_cpu = container_of(env, ArchCPU, env);
+    return &arch_cpu->neg;
+}
+
+/**
+ * cpu_neg(cpu)
+ * @cpu: The generic CPUState
+ *
+ * Return the CPUNegativeOffsetState associated with the cpu.
+ */
+static inline CPUNegativeOffsetState *cpu_neg(CPUState *cpu)
+{
+    ArchCPU *arch_cpu = container_of(cpu, ArchCPU, parent_obj);
+    return &arch_cpu->neg;
+}
+
 #endif /* CPU_ALL_H */

include/exec/cpu-defs.h

@@ -227,4 +227,12 @@ typedef struct CPUTLB {
 
 #endif  /* !CONFIG_USER_ONLY && CONFIG_TCG */
 
+/*
+ * This structure must be placed in ArchCPU immedately
+ * before CPUArchState, as a field named "neg".
+ */
+typedef struct CPUNegativeOffsetState {
+    /* Empty */
+} CPUNegativeOffsetState;
+
 #endif

target/alpha/cpu.h

@@ -272,6 +272,7 @@ struct AlphaCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUAlphaState env;
 
     /* This alarm doesn't exist in real hardware; we wish it did.  */

target/arm/cpu.h

@@ -721,6 +721,7 @@ struct ARMCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUARMState env;
 
     /* Coprocessor information */

target/cris/cpu.h

@@ -180,6 +180,7 @@ struct CRISCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUCRISState env;
 };
 

target/hppa/cpu.h

@@ -218,6 +218,7 @@ struct HPPACPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUHPPAState env;
     QEMUTimer *alarm_timer;
 };

target/i386/cpu.h

@@ -1369,6 +1369,7 @@ struct X86CPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUX86State env;
 
     bool hyperv_vapic;

target/lm32/cpu.h

@@ -186,6 +186,7 @@ struct LM32CPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPULM32State env;
 
     uint32_t revision;

target/m68k/cpu.h

@@ -160,6 +160,7 @@ struct M68kCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUM68KState env;
 };
 

target/microblaze/cpu.h

@@ -287,6 +287,9 @@ struct MicroBlazeCPU {
 
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
+    CPUMBState env;
+
     /* Microblaze Configuration Settings */
     struct {
         bool stackprot;
@@ -306,8 +309,6 @@ struct MicroBlazeCPU {
         char *version;
         uint8_t pvr;
     } cfg;
-
-    CPUMBState env;
 };
 
 

target/mips/cpu.h

@@ -1068,6 +1068,7 @@ struct MIPSCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUMIPSState env;
 };
 

target/moxie/cpu.h

@@ -87,6 +87,7 @@ typedef struct MoxieCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUMoxieState env;
 } MoxieCPU;
 

target/nios2/cpu.h

@@ -182,7 +182,9 @@ typedef struct Nios2CPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUNios2State env;
+
     bool mmu_present;
     uint32_t pid_num_bits;
     uint32_t tlb_num_ways;

target/openrisc/cpu.h

@@ -313,8 +313,8 @@ typedef struct OpenRISCCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUOpenRISCState env;
-
 } OpenRISCCPU;
 
 

target/ppc/cpu.h

@@ -1184,7 +1184,9 @@ struct PowerPCCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUPPCState env;
+
     int vcpu_id;
     uint32_t compat_pvr;
     PPCVirtualHypervisor *vhyp;

target/riscv/cpu.h

@@ -210,6 +210,7 @@ typedef struct RISCVCPU {
     /*< private >*/
     CPUState parent_obj;
     /*< public >*/
+    CPUNegativeOffsetState neg;
     CPURISCVState env;
 
     /* Configuration Settings */

target/s390x/cpu.h

@@ -156,6 +156,7 @@ struct S390CPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUS390XState env;
     S390CPUModel *model;
     /* needed for live migration */

target/sh4/cpu.h

@@ -204,6 +204,7 @@ struct SuperHCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUSH4State env;
 };
 

target/sparc/cpu.h

@@ -529,6 +529,7 @@ struct SPARCCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUSPARCState env;
 };
 

target/tilegx/cpu.h

@@ -135,6 +135,7 @@ typedef struct TileGXCPU {
     CPUState parent_obj;
     /*< public >*/
 
+    CPUNegativeOffsetState neg;
     CPUTLGState env;
 } TileGXCPU;