target-arm: make c13 cp regs banked (FCSEIDR, ...)

When EL3 is running in AArch32 (or ARMv7 with Security Extensions)
FCSEIDR, CONTEXTIDR, TPIDRURW, TPIDRURO and TPIDRPRW have a secure
and a non-secure instance.

Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1416242878-876-25-git-send-email-greg.bellows@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 77 insertions, 19 deletions

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index fc6449750f..a1fefe4985 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -307,11 +307,37 @@ typedef struct CPUARMState {
             uint64_t vbar_el[4];
         };
         uint32_t mvbar; /* (monitor) vector base address register */
-        uint32_t c13_fcse; /* FCSE PID.  */
-        uint64_t contextidr_el1; /* Context ID.  */
-        uint64_t tpidr_el0; /* User RW Thread register.  */
-        uint64_t tpidrro_el0; /* User RO Thread register.  */
-        uint64_t tpidr_el1; /* Privileged Thread register.  */
+        struct { /* FCSE PID. */
+            uint32_t fcseidr_ns;
+            uint32_t fcseidr_s;
+        };
+        union { /* Context ID. */
+            struct {
+                uint64_t _unused_contextidr_0;
+                uint64_t contextidr_ns;
+                uint64_t _unused_contextidr_1;
+                uint64_t contextidr_s;
+            };
+            uint64_t contextidr_el[4];
+        };
+        union { /* User RW Thread register. */
+            struct {
+                uint64_t tpidrurw_ns;
+                uint64_t tpidrprw_ns;
+                uint64_t htpidr;
+                uint64_t _tpidr_el3;
+            };
+            uint64_t tpidr_el[4];
+        };
+        /* The secure banks of these registers don't map anywhere */
+        uint64_t tpidrurw_s;
+        uint64_t tpidrprw_s;
+        uint64_t tpidruro_s;
+
+        union { /* User RO Thread register. */
+            uint64_t tpidruro_ns;
+            uint64_t tpidrro_el[1];
+        };
         uint64_t c14_cntfrq; /* Counter Frequency register */
         uint64_t c14_cntkctl; /* Timer Control register */
         ARMGenericTimer c14_timer[NUM_GTIMERS];
diff --git a/target-arm/helper.c b/target-arm/helper.c
index bc73c4fbbf..0357f41e9a 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -424,13 +424,36 @@ static void tlbimvaa_is_write(CPUARMState *env, const ARMCPRegInfo *ri,
 }
 
 static const ARMCPRegInfo cp_reginfo[] = {
-    { .name = "FCSEIDR", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 0,
-      .access = PL1_RW, .fieldoffset = offsetof(CPUARMState, cp15.c13_fcse),
+    /* Define the secure and non-secure FCSE identifier CP registers
+     * separately because there is no secure bank in V8 (no _EL3).  This allows
+     * the secure register to be properly reset and migrated. There is also no
+     * v8 EL1 version of the register so the non-secure instance stands alone.
+     */
+    { .name = "FCSEIDR(NS)",
+      .cp = 15, .opc1 = 0, .crn = 13, .crm = 0, .opc2 = 0,
+      .access = PL1_RW, .secure = ARM_CP_SECSTATE_NS,
+      .fieldoffset = offsetof(CPUARMState, cp15.fcseidr_ns),
+      .resetvalue = 0, .writefn = fcse_write, .raw_writefn = raw_write, },
+    { .name = "FCSEIDR(S)",
+      .cp = 15, .opc1 = 0, .crn = 13, .crm = 0, .opc2 = 0,
+      .access = PL1_RW, .secure = ARM_CP_SECSTATE_S,
+      .fieldoffset = offsetof(CPUARMState, cp15.fcseidr_s),
       .resetvalue = 0, .writefn = fcse_write, .raw_writefn = raw_write, },
-    { .name = "CONTEXTIDR", .state = ARM_CP_STATE_BOTH,
+    /* Define the secure and non-secure context identifier CP registers
+     * separately because there is no secure bank in V8 (no _EL3).  This allows
+     * the secure register to be properly reset and migrated.  In the
+     * non-secure case, the 32-bit register will have reset and migration
+     * disabled during registration as it is handled by the 64-bit instance.
+     */
+    { .name = "CONTEXTIDR_EL1", .state = ARM_CP_STATE_BOTH,
       .opc0 = 3, .opc1 = 0, .crn = 13, .crm = 0, .opc2 = 1,
-      .access = PL1_RW,
-      .fieldoffset = offsetof(CPUARMState, cp15.contextidr_el1),
+      .access = PL1_RW, .secure = ARM_CP_SECSTATE_NS,
+      .fieldoffset = offsetof(CPUARMState, cp15.contextidr_el[1]),
+      .resetvalue = 0, .writefn = contextidr_write, .raw_writefn = raw_write, },
+    { .name = "CONTEXTIDR(S)", .state = ARM_CP_STATE_AA32,
+      .cp = 15, .opc1 = 0, .crn = 13, .crm = 0, .opc2 = 1,
+      .access = PL1_RW, .secure = ARM_CP_SECSTATE_S,
+      .fieldoffset = offsetof(CPUARMState, cp15.contextidr_s),
       .resetvalue = 0, .writefn = contextidr_write, .raw_writefn = raw_write, },
     REGINFO_SENTINEL
 };
@@ -1031,23 +1054,31 @@ static const ARMCPRegInfo v6k_cp_reginfo[] = {
     { .name = "TPIDR_EL0", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .opc1 = 3, .opc2 = 2, .crn = 13, .crm = 0,
       .access = PL0_RW,
-      .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el0), .resetvalue = 0 },
+      .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el[0]), .resetvalue = 0 },
     { .name = "TPIDRURW", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 2,
       .access = PL0_RW,
-      .fieldoffset = offsetoflow32(CPUARMState, cp15.tpidr_el0),
+      .bank_fieldoffsets = { offsetoflow32(CPUARMState, cp15.tpidrurw_s),
+                             offsetoflow32(CPUARMState, cp15.tpidrurw_ns) },
       .resetfn = arm_cp_reset_ignore },
     { .name = "TPIDRRO_EL0", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .opc1 = 3, .opc2 = 3, .crn = 13, .crm = 0,
       .access = PL0_R|PL1_W,
-      .fieldoffset = offsetof(CPUARMState, cp15.tpidrro_el0), .resetvalue = 0 },
+      .fieldoffset = offsetof(CPUARMState, cp15.tpidrro_el[0]),
+      .resetvalue = 0},
     { .name = "TPIDRURO", .cp = 15, .crn = 13, .crm = 0, .opc1 = 0, .opc2 = 3,
       .access = PL0_R|PL1_W,
-      .fieldoffset = offsetoflow32(CPUARMState, cp15.tpidrro_el0),
+      .bank_fieldoffsets = { offsetoflow32(CPUARMState, cp15.tpidruro_s),
+                             offsetoflow32(CPUARMState, cp15.tpidruro_ns) },
       .resetfn = arm_cp_reset_ignore },
-    { .name = "TPIDR_EL1", .state = ARM_CP_STATE_BOTH,
+    { .name = "TPIDR_EL1", .state = ARM_CP_STATE_AA64,
       .opc0 = 3, .opc1 = 0, .opc2 = 4, .crn = 13, .crm = 0,
       .access = PL1_RW,
-      .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el1), .resetvalue = 0 },
+      .fieldoffset = offsetof(CPUARMState, cp15.tpidr_el[1]), .resetvalue = 0 },
+    { .name = "TPIDRPRW", .opc1 = 0, .cp = 15, .crn = 13, .crm = 0, .opc2 = 4,
+      .access = PL1_RW,
+      .bank_fieldoffsets = { offsetoflow32(CPUARMState, cp15.tpidrprw_s),
+                             offsetoflow32(CPUARMState, cp15.tpidrprw_ns) },
+      .resetvalue = 0 },
     REGINFO_SENTINEL
 };
 
@@ -5051,8 +5082,9 @@ static inline int get_phys_addr(CPUARMState *env, target_ulong address,
     uint32_t sctlr = A32_BANKED_CURRENT_REG_GET(env, sctlr);
 
     /* Fast Context Switch Extension.  */
-    if (address < 0x02000000)
-        address += env->cp15.c13_fcse;
+    if (address < 0x02000000) {
+        address += A32_BANKED_CURRENT_REG_GET(env, fcseidr);
+    }
 
     if ((sctlr & SCTLR_M) == 0) {
         /* MMU/MPU disabled.  */
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index a8dea5a3f9..2bed914770 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -575,7 +575,7 @@ static bool linked_bp_matches(ARMCPU *cpu, int lbn)
      * short descriptor format (in which case it holds both PROCID and ASID),
      * since we don't implement the optional v7 context ID masking.
      */
-    contextidr = extract64(env->cp15.contextidr_el1, 0, 32);
+    contextidr = extract64(env->cp15.contextidr_el[1], 0, 32);
 
     switch (bt) {
     case 3: /* linked context ID match */