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[Qemu-devel] [RFC PATCH 1/2] target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled

Philippe Mathieu-Daudé posted 2 patches 6 years, 8 months ago
Maintainers: Aurelien Jarno <aurelien@aurel32.net>, Aleksandar Markovic <amarkovic@wavecomp.com>, Aleksandar Rikalo <arikalo@wavecomp.com>, Peter Maydell <peter.maydell@linaro.org>
[Qemu-devel] [RFC PATCH 1/2] target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled
Posted by Philippe Mathieu-Daudé 6 years, 8 months ago 
If a distribution wants to build QEMU without semihosting support,
it currently gets this build failure:

  $ ./configure --target-list=aarch64-softmmu --without-default-devices
  $ sed -i s/CONFIG_SEMIHOSTING=y/CONFIG_SEMIHOSTING=n/ default-configs/arm-softmmu.mak
  $ make subdir-aarch64-softmmu
  [...]
    LINK    aarch64-softmmu/qemu-system-aarch64
  /usr/bin/ld: target/arm/arm-semi.o: in function `do_arm_semihosting':
  ./target/arm/arm-semi.c:321: undefined reference to `qemu_semihosting_console_out'
  /usr/bin/ld: ./target/arm/arm-semi.c:318: undefined reference to `qemu_semihosting_console_out'
  collect2: error: ld returned 1 exit status
  make[1]: *** [Makefile:204: qemu-system-aarch64] Error 1
  make: *** [Makefile:472: subdir-aarch64-softmmu] Error 2

Fix it by providing a stub when semihosting is disabled.

Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 target/arm/Makefile.objs    |  3 ++-
 target/arm/arm-semi-stubs.c | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 target/arm/arm-semi-stubs.c

diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
index 6bdcc65c2c..39b02b1fa4 100644
--- a/target/arm/Makefile.objs
+++ b/target/arm/Makefile.objs
@@ -1,4 +1,5 @@
-obj-y += arm-semi.o
+obj-$(CONFIG_SEMIHOSTING) += arm-semi.o
+obj-$(call lnot,$(CONFIG_SEMIHOSTING)) += arm-semi-stubs.o
 obj-$(CONFIG_SOFTMMU) += machine.o psci.o arch_dump.o monitor.o
 obj-$(CONFIG_KVM) += kvm.o
 obj-$(call land,$(CONFIG_KVM),$(call lnot,$(TARGET_AARCH64))) += kvm32.o
diff --git a/target/arm/arm-semi-stubs.c b/target/arm/arm-semi-stubs.c
new file mode 100644
index 0000000000..a91ecbd9d5
--- /dev/null
+++ b/target/arm/arm-semi-stubs.c
@@ -0,0 +1,21 @@
+/*
+ *  Arm "Angel" semihosting stubs
+ *
+ * Copyright (c) 2019 Red Hat, Inc.
+ *
+ * Author:
+ *   Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+
+target_ulong do_arm_semihosting(CPUARMState *env)
+{
+    g_assert_not_reached();
+}
-- 
2.20.1
Re: [Qemu-devel] [RFC PATCH 1/2] target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled
Posted by Alex Bennée 6 years, 7 months ago 
Philippe Mathieu-Daudé <philmd@redhat.com> writes:

> If a distribution wants to build QEMU without semihosting support,
> it currently gets this build failure:
>
>   $ ./configure --target-list=aarch64-softmmu --without-default-devices
>   $ sed -i s/CONFIG_SEMIHOSTING=y/CONFIG_SEMIHOSTING=n/default-configs/arm-softmmu.mak

I'm still not convinced we should be adding support for stuff being done
outside the normal build process... that said...

>   $ make subdir-aarch64-softmmu
>   [...]
>     LINK    aarch64-softmmu/qemu-system-aarch64
>   /usr/bin/ld: target/arm/arm-semi.o: in function `do_arm_semihosting':
>   ./target/arm/arm-semi.c:321: undefined reference to `qemu_semihosting_console_out'
>   /usr/bin/ld: ./target/arm/arm-semi.c:318: undefined reference to `qemu_semihosting_console_out'
>   collect2: error: ld returned 1 exit status
>   make[1]: *** [Makefile:204: qemu-system-aarch64] Error 1
>   make: *** [Makefile:472: subdir-aarch64-softmmu] Error 2
>
> Fix it by providing a stub when semihosting is disabled.
>
> Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  target/arm/Makefile.objs    |  3 ++-
>  target/arm/arm-semi-stubs.c | 21 +++++++++++++++++++++
>  2 files changed, 23 insertions(+), 1 deletion(-)
>  create mode 100644 target/arm/arm-semi-stubs.c
>
> diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
> index 6bdcc65c2c..39b02b1fa4 100644
> --- a/target/arm/Makefile.objs
> +++ b/target/arm/Makefile.objs
> @@ -1,4 +1,5 @@
> -obj-y += arm-semi.o
> +obj-$(CONFIG_SEMIHOSTING) += arm-semi.o
> +obj-$(call lnot,$(CONFIG_SEMIHOSTING)) += arm-semi-stubs.o
>  obj-$(CONFIG_SOFTMMU) += machine.o psci.o arch_dump.o monitor.o
>  obj-$(CONFIG_KVM) += kvm.o
>  obj-$(call land,$(CONFIG_KVM),$(call lnot,$(TARGET_AARCH64))) += kvm32.o
> diff --git a/target/arm/arm-semi-stubs.c b/target/arm/arm-semi-stubs.c
> new file mode 100644
> index 0000000000..a91ecbd9d5
> --- /dev/null
> +++ b/target/arm/arm-semi-stubs.c
> @@ -0,0 +1,21 @@
> +/*
> + *  Arm "Angel" semihosting stubs
> + *
> + * Copyright (c) 2019 Red Hat, Inc.
> + *
> + * Author:
> + *   Philippe Mathieu-Daudé <philmd@redhat.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "cpu.h"
> +
> +target_ulong do_arm_semihosting(CPUARMState *env)
> +{
> +    g_assert_not_reached();
> +}

Could this not just be added to arm-semi.c in an

  #ifndef CONFIG_SEMIHOSTING
  target_ulong do_arm_semihosting(CPUARMState *env)
  {
      g_assert_not_reached();
  }
  #else
  ... rest of arm-semi.c....
  #endif


--
Alex Bennée
Re: [Qemu-devel] [RFC PATCH 1/2] target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled
Posted by Philippe Mathieu-Daudé 6 years, 7 months ago 
On 6/17/19 5:19 PM, Alex Bennée wrote:
> Philippe Mathieu-Daudé <philmd@redhat.com> writes:
> 
>> If a distribution wants to build QEMU without semihosting support,
>> it currently gets this build failure:
>>
>>   $ ./configure --target-list=aarch64-softmmu --without-default-devices
>>   $ sed -i s/CONFIG_SEMIHOSTING=y/CONFIG_SEMIHOSTING=n/default-configs/arm-softmmu.mak
> 
> I'm still not convinced we should be adding support for stuff being done
> outside the normal build process...

If the "KVM/TCG split" series is accepted, then we can add a
--disable-tcg job in the list of "normal builds" and we don't need this
particular patch.

> that said...
> 
>>   $ make subdir-aarch64-softmmu
>>   [...]
>>     LINK    aarch64-softmmu/qemu-system-aarch64
>>   /usr/bin/ld: target/arm/arm-semi.o: in function `do_arm_semihosting':
>>   ./target/arm/arm-semi.c:321: undefined reference to `qemu_semihosting_console_out'
>>   /usr/bin/ld: ./target/arm/arm-semi.c:318: undefined reference to `qemu_semihosting_console_out'
>>   collect2: error: ld returned 1 exit status
>>   make[1]: *** [Makefile:204: qemu-system-aarch64] Error 1
>>   make: *** [Makefile:472: subdir-aarch64-softmmu] Error 2
>>
>> Fix it by providing a stub when semihosting is disabled.
>>
>> Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> ---
>>  target/arm/Makefile.objs    |  3 ++-
>>  target/arm/arm-semi-stubs.c | 21 +++++++++++++++++++++
>>  2 files changed, 23 insertions(+), 1 deletion(-)
>>  create mode 100644 target/arm/arm-semi-stubs.c
>>
>> diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
>> index 6bdcc65c2c..39b02b1fa4 100644
>> --- a/target/arm/Makefile.objs
>> +++ b/target/arm/Makefile.objs
>> @@ -1,4 +1,5 @@
>> -obj-y += arm-semi.o
>> +obj-$(CONFIG_SEMIHOSTING) += arm-semi.o
>> +obj-$(call lnot,$(CONFIG_SEMIHOSTING)) += arm-semi-stubs.o
>>  obj-$(CONFIG_SOFTMMU) += machine.o psci.o arch_dump.o monitor.o
>>  obj-$(CONFIG_KVM) += kvm.o
>>  obj-$(call land,$(CONFIG_KVM),$(call lnot,$(TARGET_AARCH64))) += kvm32.o
>> diff --git a/target/arm/arm-semi-stubs.c b/target/arm/arm-semi-stubs.c
>> new file mode 100644
>> index 0000000000..a91ecbd9d5
>> --- /dev/null
>> +++ b/target/arm/arm-semi-stubs.c
>> @@ -0,0 +1,21 @@
>> +/*
>> + *  Arm "Angel" semihosting stubs
>> + *
>> + * Copyright (c) 2019 Red Hat, Inc.
>> + *
>> + * Author:
>> + *   Philippe Mathieu-Daudé <philmd@redhat.com>
>> + *
>> + * SPDX-License-Identifier: GPL-2.0-or-later
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
>> + * See the COPYING file in the top-level directory.
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +#include "cpu.h"
>> +
>> +target_ulong do_arm_semihosting(CPUARMState *env)
>> +{
>> +    g_assert_not_reached();
>> +}
> 
> Could this not just be added to arm-semi.c in an
> 
>   #ifndef CONFIG_SEMIHOSTING
>   target_ulong do_arm_semihosting(CPUARMState *env)
>   {
>       g_assert_not_reached();
>   }
>   #else
>   ... rest of arm-semi.c....
>   #endif

OK, thanks for your reviews!

Phil.
Re: [Qemu-devel] [RFC PATCH 1/2] target/arm: Add stubs to build with CONFIG_SEMIHOSTING disabled
Posted by Philippe Mathieu-Daudé 6 years, 7 months ago 
On 6/17/19 5:33 PM, Philippe Mathieu-Daudé wrote:
> On 6/17/19 5:19 PM, Alex Bennée wrote:
>> Philippe Mathieu-Daudé <philmd@redhat.com> writes:
>>
>>> If a distribution wants to build QEMU without semihosting support,
>>> it currently gets this build failure:
>>>
>>>   $ ./configure --target-list=aarch64-softmmu --without-default-devices
>>>   $ sed -i s/CONFIG_SEMIHOSTING=y/CONFIG_SEMIHOSTING=n/default-configs/arm-softmmu.mak
>>
>> I'm still not convinced we should be adding support for stuff being done
>> outside the normal build process...
> 
> If the "KVM/TCG split" series is accepted, then we can add a
> --disable-tcg job in the list of "normal builds" and we don't need this
> particular patch.
> 
>> that said...
>>
>>>   $ make subdir-aarch64-softmmu
>>>   [...]
>>>     LINK    aarch64-softmmu/qemu-system-aarch64
>>>   /usr/bin/ld: target/arm/arm-semi.o: in function `do_arm_semihosting':
>>>   ./target/arm/arm-semi.c:321: undefined reference to `qemu_semihosting_console_out'
>>>   /usr/bin/ld: ./target/arm/arm-semi.c:318: undefined reference to `qemu_semihosting_console_out'
>>>   collect2: error: ld returned 1 exit status
>>>   make[1]: *** [Makefile:204: qemu-system-aarch64] Error 1
>>>   make: *** [Makefile:472: subdir-aarch64-softmmu] Error 2
>>>
>>> Fix it by providing a stub when semihosting is disabled.
>>>
>>> Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>>> ---
>>>  target/arm/Makefile.objs    |  3 ++-
>>>  target/arm/arm-semi-stubs.c | 21 +++++++++++++++++++++
>>>  2 files changed, 23 insertions(+), 1 deletion(-)
>>>  create mode 100644 target/arm/arm-semi-stubs.c
>>>
>>> diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
>>> index 6bdcc65c2c..39b02b1fa4 100644
>>> --- a/target/arm/Makefile.objs
>>> +++ b/target/arm/Makefile.objs
>>> @@ -1,4 +1,5 @@
>>> -obj-y += arm-semi.o
>>> +obj-$(CONFIG_SEMIHOSTING) += arm-semi.o
>>> +obj-$(call lnot,$(CONFIG_SEMIHOSTING)) += arm-semi-stubs.o
>>>  obj-$(CONFIG_SOFTMMU) += machine.o psci.o arch_dump.o monitor.o
>>>  obj-$(CONFIG_KVM) += kvm.o
>>>  obj-$(call land,$(CONFIG_KVM),$(call lnot,$(TARGET_AARCH64))) += kvm32.o
>>> diff --git a/target/arm/arm-semi-stubs.c b/target/arm/arm-semi-stubs.c
>>> new file mode 100644
>>> index 0000000000..a91ecbd9d5
>>> --- /dev/null
>>> +++ b/target/arm/arm-semi-stubs.c
>>> @@ -0,0 +1,21 @@
>>> +/*
>>> + *  Arm "Angel" semihosting stubs
>>> + *
>>> + * Copyright (c) 2019 Red Hat, Inc.
>>> + *
>>> + * Author:
>>> + *   Philippe Mathieu-Daudé <philmd@redhat.com>
>>> + *
>>> + * SPDX-License-Identifier: GPL-2.0-or-later
>>> + *
>>> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
>>> + * See the COPYING file in the top-level directory.
>>> + */
>>> +
>>> +#include "qemu/osdep.h"
>>> +#include "cpu.h"
>>> +
>>> +target_ulong do_arm_semihosting(CPUARMState *env)
>>> +{
>>> +    g_assert_not_reached();
>>> +}
>>
>> Could this not just be added to arm-semi.c in an
>>
>>   #ifndef CONFIG_SEMIHOSTING
>>   target_ulong do_arm_semihosting(CPUARMState *env)
>>   {
>>       g_assert_not_reached();
>>   }
>>   #else
>>   ... rest of arm-semi.c....
>>   #endif

Note that CONFIG_SEMIHOSTING is a Make definition, not a CPP one,
and it doesn't look straight forward to get it added to config-target.h...

Patchew 2.1-devel-b67e4c2

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