target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts

The test in tests/avocado/machine_loongarch.py is currently failing
on big endian hosts like s390x. By comparing the traces between running
the QEMU_EFI.fd bios on a s390x and on a x86 host, it's quickly obvious
that the CSRRD instruction for the CPUID is behaving differently. And
indeed: The code currently does a long read (i.e. 64 bit) from the
address that points to the CPUState->cpu_index field (with tcg_gen_ld_tl()
in the trans_csrrd() function). But this cpu_index field is only an "int"
(i.e. 32 bit). While this dirty pointer magic works on little endian hosts,
it of course fails on big endian hosts. Fix it by using a proper helper
function instead.

Message-Id: <20230720175307.854460-1-thuth@redhat.com>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit c34ad45992)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

target/loongarch/cpu.h

@@ -317,6 +317,7 @@ typedef struct CPUArchState {
     uint64_t CSR_DBG;
     uint64_t CSR_DERA;
     uint64_t CSR_DSAVE;
+    uint64_t CSR_CPUID;
 
 #ifndef CONFIG_USER_ONLY
     LoongArchTLB  tlb[LOONGARCH_TLB_MAX];

target/loongarch/csr_helper.c

@@ -36,6 +36,15 @@ target_ulong helper_csrrd_pgd(CPULoongArchState *env)
     return v;
 }
 
+target_ulong helper_csrrd_cpuid(CPULoongArchState *env)
+{
+    LoongArchCPU *lac = env_archcpu(env);
+
+    env->CSR_CPUID = CPU(lac)->cpu_index;
+
+    return env->CSR_CPUID;
+}
+
 target_ulong helper_csrrd_tval(CPULoongArchState *env)
 {
     LoongArchCPU *cpu = env_archcpu(env);

target/loongarch/helper.h

@@ -98,6 +98,7 @@ DEF_HELPER_1(rdtime_d, i64, env)
 #ifndef CONFIG_USER_ONLY
 /* CSRs helper */
 DEF_HELPER_1(csrrd_pgd, i64, env)
+DEF_HELPER_1(csrrd_cpuid, i64, env)
 DEF_HELPER_1(csrrd_tval, i64, env)
 DEF_HELPER_2(csrwr_estat, i64, env, tl)
 DEF_HELPER_2(csrwr_asid, i64, env, tl)

target/loongarch/insn_trans/trans_privileged.c.inc

@@ -99,13 +99,7 @@ static const CSRInfo csr_info[] = {
     CSR_OFF(PWCH),
     CSR_OFF(STLBPS),
     CSR_OFF(RVACFG),
-    [LOONGARCH_CSR_CPUID] = {
-        .offset = (int)offsetof(CPUState, cpu_index)
-                  - (int)offsetof(LoongArchCPU, env),
-        .flags = CSRFL_READONLY,
-        .readfn = NULL,
-        .writefn = NULL
-    },
+    CSR_OFF_FUNCS(CPUID, CSRFL_READONLY, gen_helper_csrrd_cpuid, NULL),
     CSR_OFF_FLAGS(PRCFG1, CSRFL_READONLY),
     CSR_OFF_FLAGS(PRCFG2, CSRFL_READONLY),
     CSR_OFF_FLAGS(PRCFG3, CSRFL_READONLY),