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From: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org,
	keescook-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
	mcgrof-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	shuah-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Cc: brakmo-b10kYP2dOMg@public.gmane.org,
	robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	richard-/L3Ra7n9ekc@public.gmane.org,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
	mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org,
	Tim.Bird-7U/KSKJipcs@public.gmane.org,
	linux-um-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org,
	kieran.bingham-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org,
	julia.lawall-L2FTfq7BK8M@public.gmane.org,
	joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org,
	linux-kselftest-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	khilman-rdvid1DuHRBWk0Htik3J/w@public.gmane.org,
	joe-6d6DIl74uiNBDgjK7y7TUQ@public.gmane.org,
	daniel-/w4YWyX8dFk@public.gmane.org,
	jdike-OPE4K8JWMJJBDgjK7y7TUQ@public.gmane.org,
	Brendan Higgins
	<brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	kunit-dev-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
Subject: [RFC v2 08/14] arch: um: add shim to trap to allow installing a fault catcher for tests
Date: Tue, 23 Oct 2018 16:57:44 -0700	[thread overview]
Message-ID: <20181023235750.103146-9-brendanhiggins@google.com> (raw)
In-Reply-To: <20181023235750.103146-1-brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>

Add context to current thread that allows a test to specify that it
wants to skip the normal checks to run an installed fault catcher.

Signed-off-by: Brendan Higgins <brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
---
 arch/um/include/asm/processor-generic.h |  4 +++-
 arch/um/kernel/trap.c                   | 15 +++++++++++----
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index b58b746d3f2ca..d566cd416ff02 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -27,6 +27,7 @@ struct thread_struct {
 	struct task_struct *prev_sched;
 	struct arch_thread arch;
 	jmp_buf switch_buf;
+	bool is_running_test;
 	struct {
 		int op;
 		union {
@@ -51,7 +52,8 @@ struct thread_struct {
 	.fault_addr		= NULL, \
 	.prev_sched		= NULL, \
 	.arch			= INIT_ARCH_THREAD, \
-	.request		= { 0 } \
+	.request		= { 0 }, \
+	.is_running_test	= false, \
 }
 
 static inline void release_thread(struct task_struct *task)
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index cced829460427..bf90e678b3d71 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -201,6 +201,12 @@ void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
 	segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
 }
 
+static void segv_run_catcher(jmp_buf *catcher, void *fault_addr)
+{
+	current->thread.fault_addr = fault_addr;
+	UML_LONGJMP(catcher, 1);
+}
+
 /*
  * We give a *copy* of the faultinfo in the regs to segv.
  * This must be done, since nesting SEGVs could overwrite
@@ -219,7 +225,10 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
 	if (!is_user && regs)
 		current->thread.segv_regs = container_of(regs, struct pt_regs, regs);
 
-	if (!is_user && (address >= start_vm) && (address < end_vm)) {
+	catcher = current->thread.fault_catcher;
+	if (catcher && current->thread.is_running_test)
+		segv_run_catcher(catcher, (void *) address);
+	else if (!is_user && (address >= start_vm) && (address < end_vm)) {
 		flush_tlb_kernel_vm();
 		goto out;
 	}
@@ -246,12 +255,10 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
 		address = 0;
 	}
 
-	catcher = current->thread.fault_catcher;
 	if (!err)
 		goto out;
 	else if (catcher != NULL) {
-		current->thread.fault_addr = (void *) address;
-		UML_LONGJMP(catcher, 1);
+		segv_run_catcher(catcher, (void *) address);
 	}
 	else if (current->thread.fault_addr != NULL)
 		panic("fault_addr set but no fault catcher");
-- 
2.19.1.568.g152ad8e336-goog

  parent reply	other threads:[~2018-10-23 23:57 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-23 23:57 [RFC v2 00/14] kunit: introduce KUnit, the Linux kernel unit testing framework Brendan Higgins
     [not found] ` <20181023235750.103146-1-brendanhiggins-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2018-10-23 23:57   ` [RFC v2 01/14] kunit: test: add KUnit test runner core Brendan Higgins
2018-11-02 18:44     ` Shuah Khan
     [not found]       ` <017b111f-d960-c1ef-46ae-eb0eb639fe5b-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2018-11-07  1:28         ` Brendan Higgins
2018-11-07 20:02           ` Shuah Khan
2018-10-23 23:57   ` [RFC v2 02/14] kunit: test: add test resource management API Brendan Higgins
2018-10-23 23:57   ` [RFC v2 03/14] kunit: test: add string_stream a std::stream like string builder Brendan Higgins
2018-10-23 23:57   ` [RFC v2 04/14] kunit: test: add test_stream a std::stream like logger Brendan Higgins
2018-10-23 23:57   ` [RFC v2 05/14] kunit: test: add the concept of expectations Brendan Higgins
2018-10-23 23:57   ` [RFC v2 06/14] arch: um: enable running kunit from User Mode Linux Brendan Higgins
2018-10-23 23:57   ` [RFC v2 07/14] kunit: test: add initial tests Brendan Higgins
2018-10-23 23:57   ` Brendan Higgins [this message]
2018-10-23 23:57   ` [RFC v2 09/14] kunit: test: add the concept of assertions Brendan Higgins
2018-10-23 23:57   ` [RFC v2 10/14] kunit: add Python libraries for handing KUnit config and kernel Brendan Higgins
2018-10-23 23:57   ` [RFC v2 11/14] kunit: add KUnit wrapper script and simple output parser Brendan Higgins
2018-10-23 23:57   ` [RFC v2 12/14] kunit.py: improve output from python wrapper Brendan Higgins
2018-10-23 23:57   ` [RFC v2 13/14] Documentation: kunit: add documentation for KUnit Brendan Higgins
2018-10-23 23:57   ` [RFC v2 14/14] MAINTAINERS: add entry for KUnit the unit testing framework Brendan Higgins
2018-10-24  9:14 ` [RFC v2 00/14] kunit: introduce KUnit, the Linux kernel " Daniel Vetter
2018-10-25 21:25   ` Brendan Higgins
2018-10-25 17:40 ` Shuah Khan
2018-11-02 18:23 ` Shuah Khan
2018-11-07  1:17   ` Brendan Higgins
2018-11-07 17:46     ` Frank Rowand
     [not found]       ` <04f677b1-bc44-f004-cf2a-51b47baf0965-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-11-13 10:10         ` Brendan Higgins
2018-11-24  5:15 ` Knut Omang
     [not found]   ` <1543036529.4680.655.camel-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2018-11-27  1:41     ` Brendan Higgins
2018-11-28 19:54       ` Knut Omang
2018-11-28 20:50         ` shuah
2018-11-30  0:59           ` Luis Chamberlain

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