target/arm: Implement FEAT_NV2 redirection of sysregs to RAM
FEAT_NV2 requires that when HCR_EL2.{NV,NV2} == 0b11 then accesses by
EL1 to certain system registers are redirected to RAM. The full list
of affected registers is in the table in rule R_CSRPQ in the Arm ARM.
The registers may be normally accessible at EL1 (like ACTLR_EL1), or
normally UNDEF at EL1 (like HCR_EL2). Some registers redirect to RAM
only when HCR_EL2.NV1 is 0, and some only when HCR_EL2.NV1 is 1;
others trap in both cases.
Add the infrastructure for identifying which registers should be
redirected and turning them into memory accesses.
This code does not set the correct syndrome or arrange for the
exception to be taken to the correct target EL if the access via
VNCR_EL2 faults; we will do that in the next commit.
Subsequent commits will mark up the relevant regdefs to set their
nv2_redirect_offset, and if relevant one of the two flags which
indicates that the redirect happens only for a particular value of
HCR_EL2.NV1.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Miguel Luis <miguel.luis@oracle.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/target/arm/cpregs.h b/target/arm/cpregs.h
index cb795be..b6fdd0f 100644
--- a/target/arm/cpregs.h
+++ b/target/arm/cpregs.h
@@ -826,6 +826,11 @@
#define CP_ANY 0xff
+/* Flags in the high bits of nv2_redirect_offset */
+#define NV2_REDIR_NV1 0x4000 /* Only redirect when HCR_EL2.NV1 == 1 */
+#define NV2_REDIR_NO_NV1 0x8000 /* Only redirect when HCR_EL2.NV1 == 0 */
+#define NV2_REDIR_FLAG_MASK 0xc000
+
/* Definition of an ARM coprocessor register */
struct ARMCPRegInfo {
/* Name of register (useful mainly for debugging, need not be unique) */
@@ -867,6 +872,13 @@
* value encodes both the trap register and bit within it.
*/
FGTBit fgt;
+
+ /*
+ * Offset from VNCR_EL2 when FEAT_NV2 redirects access to memory;
+ * may include an NV2_REDIR_* flag.
+ */
+ uint32_t nv2_redirect_offset;
+
/*
* The opaque pointer passed to define_arm_cp_regs_with_opaque() when
* this register was defined: can be used to hand data through to the
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index f521219..9281d74 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -3241,6 +3241,10 @@
FIELD(TBFLAG_A64, NV, 32, 1)
FIELD(TBFLAG_A64, NV1, 33, 1)
FIELD(TBFLAG_A64, NV2, 34, 1)
+/* Set if FEAT_NV2 RAM accesses use the EL2&0 translation regime */
+FIELD(TBFLAG_A64, NV2_MEM_E20, 35, 1)
+/* Set if FEAT_NV2 RAM accesses are big-endian */
+FIELD(TBFLAG_A64, NV2_MEM_BE, 36, 1)
/*
* Helpers for using the above. Note that only the A64 accessors use
diff --git a/target/arm/tcg/hflags.c b/target/arm/tcg/hflags.c
index d2b3526..8e5d35d 100644
--- a/target/arm/tcg/hflags.c
+++ b/target/arm/tcg/hflags.c
@@ -307,6 +307,12 @@
}
if (hcr & HCR_NV2) {
DP_TBFLAG_A64(flags, NV2, 1);
+ if (hcr & HCR_E2H) {
+ DP_TBFLAG_A64(flags, NV2_MEM_E20, 1);
+ }
+ if (env->cp15.sctlr_el[2] & SCTLR_EE) {
+ DP_TBFLAG_A64(flags, NV2_MEM_BE, 1);
+ }
}
}
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 2ada5b7..2938397 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -2135,6 +2135,7 @@
bool nv_trap_to_el2 = false;
bool nv_redirect_reg = false;
bool skip_fp_access_checks = false;
+ bool nv2_mem_redirect = false;
TCGv_ptr tcg_ri = NULL;
TCGv_i64 tcg_rt;
uint32_t syndrome = syn_aa64_sysregtrap(op0, op1, op2, crn, crm, rt, isread);
@@ -2167,6 +2168,21 @@
return;
}
+ if (s->nv2 && ri->nv2_redirect_offset) {
+ /*
+ * Some registers always redirect to memory; some only do so if
+ * HCR_EL2.NV1 is 0, and some only if NV1 is 1 (these come in
+ * pairs which share an offset; see the table in R_CSRPQ).
+ */
+ if (ri->nv2_redirect_offset & NV2_REDIR_NV1) {
+ nv2_mem_redirect = s->nv1;
+ } else if (ri->nv2_redirect_offset & NV2_REDIR_NO_NV1) {
+ nv2_mem_redirect = !s->nv1;
+ } else {
+ nv2_mem_redirect = true;
+ }
+ }
+
/* Check access permissions */
if (!cp_access_ok(s->current_el, ri, isread)) {
/*
@@ -2182,6 +2198,12 @@
* the EL2 register's accessfn.
*/
nv_redirect_reg = true;
+ assert(!nv2_mem_redirect);
+ } else if (nv2_mem_redirect) {
+ /*
+ * NV2 redirect-to-memory takes precedence over trap to EL2 or
+ * UNDEF to EL1.
+ */
} else if (s->nv && arm_cpreg_traps_in_nv(ri)) {
/*
* This register / instruction exists and is an EL2 register, so
@@ -2255,6 +2277,38 @@
assert(!(ri->type & ARM_CP_RAISES_EXC));
}
+ if (nv2_mem_redirect) {
+ /*
+ * This system register is being redirected into an EL2 memory access.
+ * This means it is not an IO operation, doesn't change hflags,
+ * and need not end the TB, because it has no side effects.
+ *
+ * The access is 64-bit single copy atomic, guaranteed aligned because
+ * of the definition of VCNR_EL2. Its endianness depends on
+ * SCTLR_EL2.EE, not on the data endianness of EL1.
+ * It is done under either the EL2 translation regime or the EL2&0
+ * translation regime, depending on HCR_EL2.E2H. It behaves as if
+ * PSTATE.PAN is 0.
+ */
+ TCGv_i64 ptr = tcg_temp_new_i64();
+ MemOp mop = MO_64 | MO_ALIGN | MO_ATOM_IFALIGN;
+ ARMMMUIdx armmemidx = s->nv2_mem_e20 ? ARMMMUIdx_E20_2 : ARMMMUIdx_E2;
+ int memidx = arm_to_core_mmu_idx(armmemidx);
+
+ mop |= (s->nv2_mem_be ? MO_BE : MO_LE);
+
+ tcg_gen_ld_i64(ptr, tcg_env, offsetof(CPUARMState, cp15.vncr_el2));
+ tcg_gen_addi_i64(ptr, ptr,
+ (ri->nv2_redirect_offset & ~NV2_REDIR_FLAG_MASK));
+ tcg_rt = cpu_reg(s, rt);
+ if (isread) {
+ tcg_gen_qemu_ld_i64(tcg_rt, ptr, memidx, mop);
+ } else {
+ tcg_gen_qemu_st_i64(tcg_rt, ptr, memidx, mop);
+ }
+ return;
+ }
+
/* Handle special cases first */
switch (ri->type & ARM_CP_SPECIAL_MASK) {
case 0:
@@ -14063,6 +14117,8 @@
dc->nv = EX_TBFLAG_A64(tb_flags, NV);
dc->nv1 = EX_TBFLAG_A64(tb_flags, NV1);
dc->nv2 = EX_TBFLAG_A64(tb_flags, NV2);
+ dc->nv2_mem_e20 = EX_TBFLAG_A64(tb_flags, NV2_MEM_E20);
+ dc->nv2_mem_be = EX_TBFLAG_A64(tb_flags, NV2_MEM_BE);
dc->vec_len = 0;
dc->vec_stride = 0;
dc->cp_regs = arm_cpu->cp_regs;
diff --git a/target/arm/tcg/translate.h b/target/arm/tcg/translate.h
index 9e13c4e..93be745 100644
--- a/target/arm/tcg/translate.h
+++ b/target/arm/tcg/translate.h
@@ -150,6 +150,10 @@
bool nv1;
/* True if NV enabled and HCR_EL2.NV2 is set */
bool nv2;
+ /* True if NV2 enabled and NV2 RAM accesses use EL2&0 translation regime */
+ bool nv2_mem_e20;
+ /* True if NV2 enabled and NV2 RAM accesses are big-endian */
+ bool nv2_mem_be;
/*
* >= 0, a copy of PSTATE.BTYPE, which will be 0 without v8.5-BTI.
* < 0, set by the current instruction.
@@ -165,6 +169,8 @@
int c15_cpar;
/* TCG op of the current insn_start. */
TCGOp *insn_start;
+ /* Offset from VNCR_EL2 when FEAT_NV2 redirects this reg to memory */
+ uint32_t nv2_redirect_offset;
} DisasContext;
typedef struct DisasCompare {
