diff mbox series

[19/26] target/mips: Move helper_cache() to tcg/sysemu/special_helper.c

Message ID 20210418163134.1133100-20-f4bug@amsat.org
State New
Headers show
Series target/mips: Re-org to allow KVM-only builds | expand

Commit Message

Philippe Mathieu-Daudé April 18, 2021, 4:31 p.m. UTC 
Move helper_cache() to tcg/sysemu/special_helper.c.

The CACHE opcode is privileged and is not accessible in user
emulation. However we get a link failure when restricting the
symbol to sysemu. For now, add a stub to satisfy linking, which
abort if ever called.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 target/mips/op_helper.c                 | 35 -------------------------
 target/mips/tcg/sysemu/special_helper.c | 33 +++++++++++++++++++++++
 target/mips/tcg/user/stubs.c            | 29 ++++++++++++++++++++
 target/mips/tcg/user/meson.build        |  1 +
 4 files changed, 63 insertions(+), 35 deletions(-)
 create mode 100644 target/mips/tcg/user/stubs.c

Comments

Richard Henderson April 18, 2021, 7:52 p.m. UTC | #1 
On 4/18/21 9:31 AM, Philippe Mathieu-Daudé wrote:
> Move helper_cache() to tcg/sysemu/special_helper.c.
> 
> The CACHE opcode is privileged and is not accessible in user
> emulation. However we get a link failure when restricting the
> symbol to sysemu. For now, add a stub to satisfy linking, which
> abort if ever called.
> 
> Signed-off-by: Philippe Mathieu-Daudé<f4bug@amsat.org>
> ---
>   target/mips/op_helper.c                 | 35 -------------------------
>   target/mips/tcg/sysemu/special_helper.c | 33 +++++++++++++++++++++++
>   target/mips/tcg/user/stubs.c            | 29 ++++++++++++++++++++
>   target/mips/tcg/user/meson.build        |  1 +
>   4 files changed, 63 insertions(+), 35 deletions(-)
>   create mode 100644 target/mips/tcg/user/stubs.c

You could add a different stub to translate.c instead.  See

https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg08595.html


r~
Philippe Mathieu-Daudé April 18, 2021, 8:20 p.m. UTC | #2 
On 4/18/21 9:52 PM, Richard Henderson wrote:
> On 4/18/21 9:31 AM, Philippe Mathieu-Daudé wrote:
>> Move helper_cache() to tcg/sysemu/special_helper.c.
>>
>> The CACHE opcode is privileged and is not accessible in user
>> emulation. However we get a link failure when restricting the
>> symbol to sysemu. For now, add a stub to satisfy linking, which
>> abort if ever called.
>>
>> Signed-off-by: Philippe Mathieu-Daudé<f4bug@amsat.org>
>> ---
>>   target/mips/op_helper.c                 | 35 -------------------------
>>   target/mips/tcg/sysemu/special_helper.c | 33 +++++++++++++++++++++++
>>   target/mips/tcg/user/stubs.c            | 29 ++++++++++++++++++++
>>   target/mips/tcg/user/meson.build        |  1 +
>>   4 files changed, 63 insertions(+), 35 deletions(-)
>>   create mode 100644 target/mips/tcg/user/stubs.c
> 
> You could add a different stub to translate.c instead.  See
> 
> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg08595.html

Great!

I think STUB_HELPER() belong to include/exec/helper-*.h.

Thanks,

Phil.
diff mbox series

Patch

diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c
index 3903545831f..659c4d15668 100644
--- a/target/mips/op_helper.c
+++ b/target/mips/op_helper.c
@@ -789,38 +789,3 @@  void mips_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
     }
 }
 #endif /* !CONFIG_USER_ONLY */
-
-void helper_cache(CPUMIPSState *env, target_ulong addr, uint32_t op)
-{
-#ifndef CONFIG_USER_ONLY
-    static const char *const type_name[] = {
-        "Primary Instruction",
-        "Primary Data or Unified Primary",
-        "Tertiary",
-        "Secondary"
-    };
-    uint32_t cache_type = extract32(op, 0, 2);
-    uint32_t cache_operation = extract32(op, 2, 3);
-    target_ulong index = addr & 0x1fffffff;
-
-    switch (cache_operation) {
-    case 0b010: /* Index Store Tag */
-        memory_region_dispatch_write(env->itc_tag, index, env->CP0_TagLo,
-                                     MO_64, MEMTXATTRS_UNSPECIFIED);
-        break;
-    case 0b001: /* Index Load Tag */
-        memory_region_dispatch_read(env->itc_tag, index, &env->CP0_TagLo,
-                                    MO_64, MEMTXATTRS_UNSPECIFIED);
-        break;
-    case 0b000: /* Index Invalidate */
-    case 0b100: /* Hit Invalidate */
-    case 0b110: /* Hit Writeback */
-        /* no-op */
-        break;
-    default:
-        qemu_log_mask(LOG_UNIMP, "cache operation:%u (type: %s cache)\n",
-                      cache_operation, type_name[cache_type]);
-        break;
-    }
-#endif
-}
diff --git a/target/mips/tcg/sysemu/special_helper.c b/target/mips/tcg/sysemu/special_helper.c
index f2cf7252484..ae8d0d03638 100644
--- a/target/mips/tcg/sysemu/special_helper.c
+++ b/target/mips/tcg/sysemu/special_helper.c
@@ -148,3 +148,36 @@  void helper_deret(CPUMIPSState *env)
 
     debug_post_eret(env);
 }
+
+void helper_cache(CPUMIPSState *env, target_ulong addr, uint32_t op)
+{
+    static const char *const type_name[] = {
+        "Primary Instruction",
+        "Primary Data or Unified Primary",
+        "Tertiary",
+        "Secondary"
+    };
+    uint32_t cache_type = extract32(op, 0, 2);
+    uint32_t cache_operation = extract32(op, 2, 3);
+    target_ulong index = addr & 0x1fffffff;
+
+    switch (cache_operation) {
+    case 0b010: /* Index Store Tag */
+        memory_region_dispatch_write(env->itc_tag, index, env->CP0_TagLo,
+                                     MO_64, MEMTXATTRS_UNSPECIFIED);
+        break;
+    case 0b001: /* Index Load Tag */
+        memory_region_dispatch_read(env->itc_tag, index, &env->CP0_TagLo,
+                                    MO_64, MEMTXATTRS_UNSPECIFIED);
+        break;
+    case 0b000: /* Index Invalidate */
+    case 0b100: /* Hit Invalidate */
+    case 0b110: /* Hit Writeback */
+        /* no-op */
+        break;
+    default:
+        qemu_log_mask(LOG_UNIMP, "cache operation:%u (type: %s cache)\n",
+                      cache_operation, type_name[cache_type]);
+        break;
+    }
+}
diff --git a/target/mips/tcg/user/stubs.c b/target/mips/tcg/user/stubs.c
new file mode 100644
index 00000000000..adb2f8e301b
--- /dev/null
+++ b/target/mips/tcg/user/stubs.c
@@ -0,0 +1,29 @@ 
+/*
+ *  MIPS emulation helpers for qemu.
+ *
+ *  Copyright (c) 2004-2005 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "internal.h"
+#include "exec/helper-proto.h"
+
+void helper_cache(CPUMIPSState *env, target_ulong addr, uint32_t op)
+{
+    g_assert_not_reached();
+}
diff --git a/target/mips/tcg/user/meson.build b/target/mips/tcg/user/meson.build
index 2fe2062a73b..5f34783bdf2 100644
--- a/target/mips/tcg/user/meson.build
+++ b/target/mips/tcg/user/meson.build
@@ -1,3 +1,4 @@ 
 mips_user_ss.add(files(
   'helper.c',
+  'stubs.c',
 ))