Merge tag 'pull-riscv-to-apply-20251003-3' of https://github.com/alistair23/qemu into staging

First RISC-V PR for 10.2

* Fix MSI table size limit
* Add riscv64 to FirmwareArchitecture
* Sync RISC-V hwprobe with Linux
* Implement MonitorDef HMP API
* Update OpenSBI to v1.7
* Fix SiFive UART character drop issue and minor refactors
* Fix RISC-V timer migration issues
* Use riscv_cpu_is_32bit() when handling SBI_DBCN reg
* Use riscv_csrr in riscv_csr_read
* Align memory allocations to 2M on RISC-V
* Do not use translator_ldl in opcode_at
* Minor fixes of RISC-V CFI
* Modify minimum VLEN rule
* Fix vslide1[up|down].vx unexpected result when XLEN=32 and SEW=64
* Fixup IOMMU PDT Nested Walk
* Fix endianness swap on compressed instructions
* Update status of IOMMU kernel support

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* tag 'pull-riscv-to-apply-20251003-3' of https://github.com/alistair23/qemu: (26 commits)
  docs: riscv-iommu: Update status of kernel support
  target/riscv: Fix endianness swap on compressed instructions
  hw/riscv/riscv-iommu: Fixup PDT Nested Walk
  target/riscv: rvv: Fix vslide1[up|down].vx unexpected result when XLEN=32 and SEW=64
  target/riscv: rvv: Modify minimum VLEN according to enabled vector extensions
  target/riscv: rvv: Replace checking V by checking Zve32x
  target/riscv: Fix ssamoswap error handling
  target/riscv: Fix SSP CSR error handling in VU/VS mode
  target/riscv: Fix the mepc when sspopchk triggers the exception
  target/riscv: do not use translator_ldl in opcode_at
  qemu/osdep: align memory allocations to 2M on RISC-V
  target/riscv: use riscv_csrr in riscv_csr_read
  target/riscv/kvm: Use riscv_cpu_is_32bit() when handling SBI_DBCN reg
  target/riscv: Save stimer and vstimer in CPU vmstate
  hw/intc: Save timers array in RISC-V mtimer VMState
  migration: Add support for a variable-length array of UINT32 pointers
  hw/intc: Save time_delta in RISC-V mtimer VMState
  hw/char: sifive_uart: Add newline to error message
  hw/char: sifive_uart: Remove outdated comment about Tx FIFO
  hw/char: sifive_uart: Avoid pushing Tx FIFO when size is zero
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c
index 110292e84d..8382aa94cb 100644
--- a/target/riscv/op_helper.c
+++ b/target/riscv/op_helper.c
@@ -717,4 +717,53 @@ target_ulong helper_hyp_hlvx_wu(CPURISCVState *env, target_ulong addr)
     return cpu_ldl_code_mmu(env, addr, oi, ra);
 }
 
+void helper_ssamoswap_disabled(CPURISCVState *env)
+{
+    int exception = RISCV_EXCP_ILLEGAL_INST;
+
+    /*
+     * Here we follow the RISC-V CFI spec [1] to implement the exception type
+     * of ssamoswap* instruction.
+     *
+     * [1] RISC-V CFI spec v1.0, ch2.7 Atomic Swap from a Shadow Stack Location
+     *
+     * Note: We have already checked some conditions in trans_* functions:
+     *   1. The effective priv mode is not M-mode.
+     *   2. The xSSE specific to the effictive priv mode is disabled.
+     */
+    if (!get_field(env->menvcfg, MENVCFG_SSE)) {
+        /*
+         * Disabled M-mode SSE always trigger illegal instruction when
+         * current priv mode is not M-mode.
+         */
+        exception = RISCV_EXCP_ILLEGAL_INST;
+        goto done;
+    }
+
+    if (!riscv_has_ext(env, RVS)) {
+        /* S-mode is not implemented */
+        exception = RISCV_EXCP_ILLEGAL_INST;
+        goto done;
+    } else if (env->virt_enabled) {
+        /*
+         * VU/VS-mode with disabled xSSE will trigger the virtual instruction
+         * exception.
+         */
+        exception = RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
+        goto done;
+    } else {
+        /*
+         * U-mode with disabled S-mode SSE will trigger the illegal instruction
+         * exception.
+         *
+         * Note: S-mode is already handled in the disabled M-mode SSE case.
+         */
+        exception = RISCV_EXCP_ILLEGAL_INST;
+        goto done;
+    }
+
+done:
+    riscv_raise_exception(env, exception, GETPC());
+}
+
 #endif /* !CONFIG_USER_ONLY */