[PATCH v2 09/33] target/riscv: Fix size of gpr and gprh

[Anton Johansson via <qemu-devel@nongnu.org>]

gprh is only needed for TARGET_RISCV64 when modeling 128-bit registers,
fixing their size to 64 bits makes sense.

gpr is also fixed to 64 bits since all direct uses of env->gpr
correctly zero extend/truncate to/from target_ulong, meaning
!TARGET_RISCV64 will behave as expected.

We do however need to be a bit careful when mapping 64-bit fields to
32-bit TCGv globals on big endian hosts.

Note, the cpu/rv128 VMSTATE version is bumped, breaking migration from
older versions.

Signed-off-by: Anton Johansson <anjo@rev.ng>
---
 target/riscv/cpu.h       |  4 ++--
 target/riscv/cpu.c       |  2 +-
 target/riscv/machine.c   |  8 ++++----
 target/riscv/translate.c | 17 +++++++++++++++--
 4 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index d4a59692a1..fe774b00ef 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -212,8 +212,8 @@ typedef struct PMUFixedCtrState {
 } PMUFixedCtrState;
 
 struct CPUArchState {
-    target_ulong gpr[32];
-    target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */
+    uint64_t gpr[32];
+    uint64_t gprh[32]; /* 64 top bits of the 128-bit registers */
 
     /* vector coprocessor state. */
     uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16);
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index d055ddf462..3c910e44cd 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -584,7 +584,7 @@ static void riscv_cpu_dump_state(CPUState *cs, FILE *f, int flags)
 
     for (i = 0; i < 32; i++) {
         qemu_fprintf(f, " %-8s " TARGET_FMT_lx,
-                     riscv_int_regnames[i], env->gpr[i]);
+                     riscv_int_regnames[i], (target_ulong) env->gpr[i]);
         if ((i & 3) == 3) {
             qemu_fprintf(f, "\n");
         }
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index 10003a1fd9..6bc79cceaf 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -176,11 +176,11 @@ static bool rv128_needed(void *opaque)
 
 static const VMStateDescription vmstate_rv128 = {
     .name = "cpu/rv128",
-    .version_id = 1,
-    .minimum_version_id = 1,
+    .version_id = 2,
+    .minimum_version_id = 2,
     .needed = rv128_needed,
     .fields = (const VMStateField[]) {
-        VMSTATE_UINTTL_ARRAY(env.gprh, RISCVCPU, 32),
+        VMSTATE_UINT64_ARRAY(env.gprh, RISCVCPU, 32),
         VMSTATE_UINT64(env.mscratchh, RISCVCPU),
         VMSTATE_UINT64(env.sscratchh, RISCVCPU),
         VMSTATE_END_OF_LIST()
@@ -404,7 +404,7 @@ const VMStateDescription vmstate_riscv_cpu = {
     .minimum_version_id = 11,
     .post_load = riscv_cpu_post_load,
     .fields = (const VMStateField[]) {
-        VMSTATE_UINTTL_ARRAY(env.gpr, RISCVCPU, 32),
+        VMSTATE_UINT64_ARRAY(env.gpr, RISCVCPU, 32),
         VMSTATE_UINT64_ARRAY(env.fpr, RISCVCPU, 32),
         VMSTATE_UINT8_ARRAY(env.miprio, RISCVCPU, 64),
         VMSTATE_UINT8_ARRAY(env.siprio, RISCVCPU, 64),
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 9ddef2d6e2..2f8c7a6465 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -26,6 +26,7 @@
 #include "exec/translator.h"
 #include "exec/translation-block.h"
 #include "exec/log.h"
+#include "exec/tswap.h"
 #include "semihosting/semihost.h"
 
 #include "internals.h"
@@ -1427,12 +1428,24 @@ void riscv_translate_init(void)
      */
     cpu_gpr[0] = NULL;
     cpu_gprh[0] = NULL;
+    /*
+     * Be careful with big endian hosts when mapping 64-bit CPUArchState fields
+     * to 32-bit TCGv globals.  An offset of 4 bytes is applied so the least
+     * significant bytes are correctly written to.
+     */
+#if HOST_BIG_ENDIAN && !defined(TARGET_RISCV64)
+    size_t field_offset = 4;
+#else
+    size_t field_offset = 0;
+#endif
 
     for (i = 1; i < 32; i++) {
         cpu_gpr[i] = tcg_global_mem_new(tcg_env,
-            offsetof(CPURISCVState, gpr[i]), riscv_int_regnames[i]);
+            offsetof(CPURISCVState, gpr[i]) + field_offset,
+            riscv_int_regnames[i]);
         cpu_gprh[i] = tcg_global_mem_new(tcg_env,
-            offsetof(CPURISCVState, gprh[i]), riscv_int_regnamesh[i]);
+            offsetof(CPURISCVState, gprh[i]) + field_offset,
+            riscv_int_regnamesh[i]);
     }
 
     for (i = 0; i < 32; i++) {
-- 
2.51.0