Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20210217' into staging

target-arm queue:
 * Support ARMv8.5-MemTag for linux-user
 * ncpm7xx: Support SMBus
 * MAINTAINERS: add section for Clock framework

# gpg: Signature made Wed 17 Feb 2021 11:01:45 GMT
# gpg:                using RSA key E1A5C593CD419DE28E8315CF3C2525ED14360CDE
# gpg:                issuer "peter.maydell@linaro.org"
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>" [ultimate]
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [ultimate]
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* remotes/pmaydell/tags/pull-target-arm-20210217: (37 commits)
  MAINTAINERS: add myself maintainer for the clock framework
  hw/i2c: Implement NPCM7XX SMBus Module FIFO Mode
  hw/i2c: Add a QTest for NPCM7XX SMBus Device
  hw/arm: Add I2C sensors and EEPROM for GSJ machine
  hw/arm: Add I2C sensors for NPCM750 eval board
  hw/i2c: Implement NPCM7XX SMBus Module Single Mode
  tests/tcg/aarch64: Add mte smoke tests
  target/arm: Enable MTE for user-only
  target/arm: Add allocation tag storage for user mode
  linux-user/aarch64: Signal SEGV_MTEAERR for async tag check error
  linux-user/aarch64: Signal SEGV_MTESERR for sync tag check fault
  linux-user/aarch64: Pass syndrome to EXC_*_ABORT
  target/arm: Split out syndrome.h from internals.h
  linux-user/aarch64: Implement PROT_MTE
  linux-user/aarch64: Implement PR_MTE_TCF and PR_MTE_TAG
  target/arm: Use the proper TBI settings for linux-user
  target/arm: Improve gen_top_byte_ignore
  linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE
  linux-user: Handle tags in lock_user/unlock_user
  linux-user: Fix types in uaccess.c
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 25 insertions, 51 deletions

diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 17aa992165..d25a5dafc0 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -7,8 +7,6 @@
 #include "exec/cpu_ldst.h"
 
 #undef DEBUG_REMAP
-#ifdef DEBUG_REMAP
-#endif /* DEBUG_REMAP */
 
 #include "exec/user/abitypes.h"
 
@@ -488,15 +486,23 @@ extern unsigned long guest_stack_size;
 
 /* user access */
 
-#define VERIFY_READ 0
-#define VERIFY_WRITE 1 /* implies read access */
+#define VERIFY_READ  PAGE_READ
+#define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
 
-static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
+static inline bool access_ok_untagged(int type, abi_ulong addr, abi_ulong size)
 {
-    return guest_addr_valid(addr) &&
-           (size == 0 || guest_addr_valid(addr + size - 1)) &&
-           page_check_range((target_ulong)addr, size,
-                            (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
+    if (size == 0
+        ? !guest_addr_valid_untagged(addr)
+        : !guest_range_valid_untagged(addr, size)) {
+        return false;
+    }
+    return page_check_range((target_ulong)addr, size, type) == 0;
+}
+
+static inline bool access_ok(CPUState *cpu, int type,
+                             abi_ulong addr, abi_ulong size)
+{
+    return access_ok_untagged(type, cpu_untagged_addr(cpu, addr), size);
 }
 
 /* NOTE __get_user and __put_user use host pointers and don't check access.
@@ -621,8 +627,8 @@ static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
  * buffers between the target and host.  These internally perform
  * locking/unlocking of the memory.
  */
-abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
-abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
+int copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
+int copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 
 /* Functions for accessing guest memory.  The tget and tput functions
    read/write single values, byteswapping as necessary.  The lock_user function
@@ -632,56 +638,24 @@ abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 
 /* Lock an area of guest memory into the host.  If copy is true then the
    host area will have the same contents as the guest.  */
-static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
-{
-    if (!access_ok(type, guest_addr, len))
-        return NULL;
-#ifdef DEBUG_REMAP
-    {
-        void *addr;
-        addr = g_malloc(len);
-        if (copy)
-            memcpy(addr, g2h(guest_addr), len);
-        else
-            memset(addr, 0, len);
-        return addr;
-    }
-#else
-    return g2h(guest_addr);
-#endif
-}
+void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy);
 
 /* Unlock an area of guest memory.  The first LEN bytes must be
    flushed back to guest memory. host_ptr = NULL is explicitly
    allowed and does nothing. */
-static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
-                               long len)
-{
-
-#ifdef DEBUG_REMAP
-    if (!host_ptr)
-        return;
-    if (host_ptr == g2h(guest_addr))
-        return;
-    if (len > 0)
-        memcpy(g2h(guest_addr), host_ptr, len);
-    g_free(host_ptr);
+#ifndef DEBUG_REMAP
+static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, size_t len)
+{ }
+#else
+void unlock_user(void *host_ptr, abi_ulong guest_addr, long len);
 #endif
-}
 
 /* Return the length of a string in target memory or -TARGET_EFAULT if
    access error. */
-abi_long target_strlen(abi_ulong gaddr);
+ssize_t target_strlen(abi_ulong gaddr);
 
 /* Like lock_user but for null terminated strings.  */
-static inline void *lock_user_string(abi_ulong guest_addr)
-{
-    abi_long len;
-    len = target_strlen(guest_addr);
-    if (len < 0)
-        return NULL;
-    return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
-}
+void *lock_user_string(abi_ulong guest_addr);
 
 /* Helper macros for locking/unlocking a target struct.  */
 #define lock_user_struct(type, host_ptr, guest_addr, copy)	\