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Mon, 23 Sep 2019 18:09:17 +0000 (UTC) Received: from thuth.remote.csb (ovpn-116-120.ams2.redhat.com [10.36.116.120]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4612919D70; Mon, 23 Sep 2019 18:09:09 +0000 (UTC) Subject: Re: [PATCH 2/4] target/arm: Move cortex-m related functions to new file v7m.c To: Auger Eric , qemu-devel@nongnu.org, Peter Maydell References: <20190921150420.30743-1-thuth@redhat.com> <20190921150420.30743-3-thuth@redhat.com> From: Thomas Huth Openpgp: preference=signencrypt Autocrypt: addr=thuth@redhat.com; prefer-encrypt=mutual; keydata= mQINBFH7eUwBEACzyOXKU+5Pcs6wNpKzrlJwzRl3VGZt95VCdb+FgoU9g11m7FWcOafrVRwU yYkTm9+7zBUc0sW5AuPGR/dp3pSLX/yFWsA/UB4nJsHqgDvDU7BImSeiTrnpMOTXb7Arw2a2 4CflIyFqjCpfDM4MuTmzTjXq4Uov1giGE9X6viNo1pxyEpd7PanlKNnf4PqEQp06X4IgUacW tSGj6Gcns1bCuHV8OPWLkf4hkRnu8hdL6i60Yxz4E6TqlrpxsfYwLXgEeswPHOA6Mn4Cso9O 0lewVYfFfsmokfAVMKWzOl1Sr0KGI5T9CpmRfAiSHpthhHWnECcJFwl72NTi6kUcUzG4se81 O6n9d/kTj7pzTmBdfwuOZ0YUSqcqs0W+l1NcASSYZQaDoD3/SLk+nqVeCBB4OnYOGhgmIHNW 0CwMRO/GK+20alxzk//V9GmIM2ACElbfF8+Uug3pqiHkVnKqM7W9/S1NH2qmxB6zMiJUHlTH gnVeZX0dgH27mzstcF786uPcdEqS0KJuxh2kk5IvUSL3Qn3ZgmgdxBMyCPciD/1cb7/Ahazr 3ThHQXSHXkH/aDXdfLsKVuwDzHLVSkdSnZdt5HHh75/NFHxwaTlydgfHmFFwodK8y/TjyiGZ zg2Kje38xnz8zKn9iesFBCcONXS7txENTzX0z80WKBhK+XSFJwARAQABtB5UaG9tYXMgSHV0 aCA8dGh1dGhAcmVkaGF0LmNvbT6JAjgEEwECACIFAlVgX6oCGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAAoJEC7Z13T+cC21EbIP/ii9cvT2HHGbFRl8HqGT6+7Wkb+XLMqJBMAIGiQK QIP3xk1HPTsLfVG0ao4hy/oYkGNOP8+ubLnZen6Yq3zAFiMhQ44lvgigDYJo3Ve59gfe99KX EbtB+X95ODARkq0McR6OAsPNJ7gpEUzfkQUUJTXRDQXfG/FX303Gvk+YU0spm2tsIKPl6AmV 1CegDljzjycyfJbk418MQmMu2T82kjrkEofUO2a24ed3VGC0/Uz//XCR2ZTo+vBoBUQl41BD eFFtoCSrzo3yPFS+w5fkH9NT8ChdpSlbNS32NhYQhJtr9zjWyFRf0Zk+T/1P7ECn6gTEkp5k ofFIA4MFBc/fXbaDRtBmPB0N9pqTFApIUI4vuFPPO0JDrII9dLwZ6lO9EKiwuVlvr1wwzsgq zJTPBU3qHaUO4d/8G+gD7AL/6T4zi8Jo/GmjBsnYaTzbm94lf0CjXjsOX3seMhaE6WAZOQQG tZHAO1kAPWpaxne+wtgMKthyPLNwelLf+xzGvrIKvLX6QuLoWMnWldu22z2ICVnLQChlR9d6 WW8QFEpo/FK7omuS8KvvopFcOOdlbFMM8Y/8vBgVMSsK6fsYUhruny/PahprPbYGiNIhKqz7 UvgyZVl4pBFjTaz/SbimTk210vIlkDyy1WuS8Zsn0htv4+jQPgo9rqFE4mipJjy/iboDuQIN BFH7eUwBEAC2nzfUeeI8dv0C4qrfCPze6NkryUflEut9WwHhfXCLjtvCjnoGqFelH/PE9NF4 4VPSCdvD1SSmFVzu6T9qWdcwMSaC+e7G/z0/AhBfqTeosAF5XvKQlAb9ZPkdDr7YN0a1XDfa +NgA+JZB4ROyBZFFAwNHT+HCnyzy0v9Sh3BgJJwfpXHH2l3LfncvV8rgFv0bvdr70U+On2XH 5bApOyW1WpIG5KPJlDdzcQTyptOJ1dnEHfwnABEfzI3dNf63rlxsGouX/NFRRRNqkdClQR3K gCwciaXfZ7ir7fF0u1N2UuLsWA8Ei1JrNypk+MRxhbvdQC4tyZCZ8mVDk+QOK6pyK2f4rMf/ WmqxNTtAVmNuZIwnJdjRMMSs4W4w6N/bRvpqtykSqx7VXcgqtv6eqoDZrNuhGbekQA0sAnCJ VPArerAZGArm63o39me/bRUQeQVSxEBmg66yshF9HkcUPGVeC4B0TPwz+HFcVhheo6hoJjLq knFOPLRj+0h+ZL+D0GenyqD3CyuyeTT5dGcNU9qT74bdSr20k/CklvI7S9yoQje8BeQAHtdV cvO8XCLrpGuw9SgOS7OP5oI26a0548M4KldAY+kqX6XVphEw3/6U1KTf7WxW5zYLTtadjISB X9xsRWSU+Yqs3C7oN5TIPSoj9tXMoxZkCIHWvnqGwZ7JhwARAQABiQIfBBgBAgAJBQJR+3lM AhsMAAoJEC7Z13T+cC21hPAQAIsBL9MdGpdEpvXs9CYrBkd6tS9mbaSWj6XBDfA1AEdQkBOn ZH1Qt7HJesk+qNSnLv6+jP4VwqK5AFMrKJ6IjE7jqgzGxtcZnvSjeDGPF1h2CKZQPpTw890k fy18AvgFHkVk2Oylyexw3aOBsXg6ukN44vIFqPoc+YSU0+0QIdYJp/XFsgWxnFIMYwDpxSHS 5fdDxUjsk3UBHZx+IhFjs2siVZi5wnHIqM7eK9abr2cK2weInTBwXwqVWjsXZ4tq5+jQrwDK cvxIcwXdUTLGxc4/Z/VRH1PZSvfQxdxMGmNTGaXVNfdFZjm4fz0mz+OUi6AHC4CZpwnsliGV ODqwX8Y1zic9viSTbKS01ZNp175POyWViUk9qisPZB7ypfSIVSEULrL347qY/hm9ahhqmn17 Ng255syASv3ehvX7iwWDfzXbA0/TVaqwa1YIkec+/8miicV0zMP9siRcYQkyTqSzaTFBBmqD oiT+z+/E59qj/EKfyce3sbC9XLjXv3mHMrq1tKX4G7IJGnS989E/fg6crv6NHae9Ckm7+lSs IQu4bBP2GxiRQ+NV3iV/KU3ebMRzqIC//DCOxzQNFNJAKldPe/bKZMCxEqtVoRkuJtNdp/5a yXFZ6TfE1hGKrDBYAm4vrnZ4CXFSBDllL59cFFOJCkn4Xboj/aVxxJxF30bn Organization: Red Hat Message-ID: <8585b93b-e239-829b-d634-b89941f27aed@redhat.com> Date: Mon, 23 Sep 2019 20:09:08 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.49]); Mon, 23 Sep 2019 18:09:17 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , qemu-arm@nongnu.org, =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 23/09/2019 16.31, Auger Eric wrote: > Hi Thomas, >=20 > On 9/21/19 5:04 PM, Thomas Huth wrote: >> We are going to make CONFIG_ARM_V7M optional, so the related cortex-m >> CPUs should only be created if the switch is enabled. This can best >> be done if the code resides in a separate file, thus move the related >> functions to a new file v7m.c which only gets compiled if CONFIG_ARM_V= 7M >> is enabled. >> >> Signed-off-by: Thomas Huth >> --- >> target/arm/Makefile.objs | 1 + >> target/arm/cpu.c | 146 ----------------------------- >> target/arm/v7m.c | 193 ++++++++++++++++++++++++++++++++++++++= + >> 3 files changed, 194 insertions(+), 146 deletions(-) >> create mode 100644 target/arm/v7m.c [...] >> diff --git a/target/arm/v7m.c b/target/arm/v7m.c >> new file mode 100644 >> index 0000000000..505043febe >> --- /dev/null >> +++ b/target/arm/v7m.c >> @@ -0,0 +1,193 @@ >> +/* >> + * ARM v7m helpers. >> + * >> + * This code is licensed under the GNU GPL v2 or later. >> + * >> + * SPDX-License-Identifier: GPL-2.0-or-later >> + */ >> + >> +#include "qemu/osdep.h" >> +#include "qemu/qemu-print.h" >> +#include "qemu-common.h" >> +#include "target/arm/idau.h" >> +#include "qemu/module.h" >> +#include "qapi/error.h" >> +#include "qapi/visitor.h" >> +#include "cpu.h" >> +#include "internals.h" >> +#include "exec/exec-all.h" >> +#include "hw/qdev-properties.h" >> +#if !defined(CONFIG_USER_ONLY) >> +#include "hw/loader.h" >> +#include "hw/boards.h" >> +#endif >> +#include "sysemu/sysemu.h" >> +#include "sysemu/tcg.h" >> +#include "sysemu/hw_accel.h" >> +#include "disas/capstone.h" >> +#include "fpu/softfloat.h" > > I guess some of those headers are not needed. Yeah, I just copy-n-pasted from the source file ... I'll check what can be omitted (if this patch series has a chance at all...) >> + >> +#if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64) >> + >> +static bool arm_v7m_cpu_exec_interrupt(CPUState *cs, int interrupt_re= quest) >> +{ >> + CPUClass *cc =3D CPU_GET_CLASS(cs); >> + ARMCPU *cpu =3D ARM_CPU(cs); >> + CPUARMState *env =3D &cpu->env; >> + bool ret =3D false; >> + >> + /* >> + * ARMv7-M interrupt masking works differently than -A or -R. >> + * There is no FIQ/IRQ distinction. Instead of I and F bits >> + * masking FIQ and IRQ interrupts, an exception is taken only >> + * if it is higher priority than the current execution priority >> + * (which depends on state like BASEPRI, FAULTMASK and the >> + * currently active exception). >> + */ >> + if (interrupt_request & CPU_INTERRUPT_HARD >> + && (armv7m_nvic_can_take_pending_exception(env->nvic))) { > > so what is the status wrt m_helper.c which stays unconditionally > compiled. m_helper functions seem to called from target/arm/translate.c > mostly. Have you abandoned the stub idea. It may be confusing to have 2 > different helper files. At least a comment explaining where a new helpe= r > shall go may be useful. All the HELPER() functions should definitely stay in m_helper.c. They are required for linking. Or do you prefer a stub file instead? Then we could maybe make the whole m_helper.c conditional in the Makefile.objs instead. However, there's one thing I currently don't quite understand in this code (since I'm not an ARM guy, sorry) : There are references to "v8" in m_helper.c, too. Is that related to a separate CPU type, ie. should the v8 code also be available when CONFIG_ARM_V7M is disabled? Or can the code in m_helper.c be disabled completely if CONFIG_ARM_V7M is not set? Thomas