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* [PATCH 1/2] ARM: mmu64: allow to disable null pointer trap on zero page
@ 2020-10-14 15:08 Michael Tretter
  2020-10-14 15:08 ` [PATCH 2/2] uimage: disable zero page when loading to SDRAM at address 0x0 Michael Tretter
  2020-10-14 16:29 ` [PATCH 1/2] ARM: mmu64: allow to disable null pointer trap on zero page Ahmad Fatoum
  0 siblings, 2 replies; 10+ messages in thread
From: Michael Tretter @ 2020-10-14 15:08 UTC (permalink / raw)
  To: barebox; +Cc: Michael Tretter

Barebox uses the zero page to trap NULL pointer dereferences. However,
if the SDRAM starts at address 0x0, this makes the first page of the
SDRAM inaccessible and makes it impossible to load images to offset 0x0
in the SDRAM.

Trapping NULL pointer dereferences on such systems is still desirable.
Therefore, add a function to disable the traps if accessing the zero
page is necessary and to re-enable the traps after the access is done.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
---
 arch/arm/cpu/Kconfig  |  1 +
 arch/arm/cpu/mmu_64.c | 13 ++++++++++++-
 include/zero_page.h   | 40 ++++++++++++++++++++++++++++++++++++++++
 lib/Kconfig           |  3 +++
 4 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 include/zero_page.h

diff --git a/arch/arm/cpu/Kconfig b/arch/arm/cpu/Kconfig
index f9f52a625260..ca3bd98962e2 100644
--- a/arch/arm/cpu/Kconfig
+++ b/arch/arm/cpu/Kconfig
@@ -89,6 +89,7 @@ config CPU_V8
 	select ARM_EXCEPTIONS
 	select GENERIC_FIND_NEXT_BIT
 	select ARCH_HAS_STACK_DUMP
+	select ARCH_HAS_ZERO_PAGE
 
 config CPU_XSC3
         bool
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c
index 7e9ae84810f6..bd15807f9160 100644
--- a/arch/arm/cpu/mmu_64.c
+++ b/arch/arm/cpu/mmu_64.c
@@ -10,6 +10,7 @@
 #include <init.h>
 #include <mmu.h>
 #include <errno.h>
+#include <zero_page.h>
 #include <linux/sizes.h>
 #include <asm/memory.h>
 #include <asm/pgtable64.h>
@@ -168,6 +169,16 @@ static void mmu_enable(void)
 	set_cr(get_cr() | CR_M | CR_C | CR_I);
 }
 
+void zero_page_disable(void)
+{
+	create_sections(0x0, 0x0, PAGE_SIZE, CACHED_MEM);
+}
+
+void zero_page_enable(void)
+{
+	create_sections(0x0, 0x0, PAGE_SIZE, 0x0);
+}
+
 /*
  * Prepare MMU for usage enable it.
  */
@@ -194,7 +205,7 @@ void __mmu_init(bool mmu_on)
 		create_sections(bank->start, bank->start, bank->size, CACHED_MEM);
 
 	/* Make zero page faulting to catch NULL pointer derefs */
-	create_sections(0x0, 0x0, 0x1000, 0x0);
+	zero_page_enable();
 
 	mmu_enable();
 }
diff --git a/include/zero_page.h b/include/zero_page.h
new file mode 100644
index 000000000000..d8dd07cfe959
--- /dev/null
+++ b/include/zero_page.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ZERO_PAGE_H
+#define __ZERO_PAGE_H
+
+#include <common.h>
+
+#if defined CONFIG_ARCH_HAS_ZERO_PAGE
+
+/*
+ * zero_page_enable - enable null pointer trap
+ */
+void zero_page_enable(void);
+
+/*
+ * zero_page_disable - disable null pointer trap
+ *
+ * Disable the null pointer trap on the zero page if access to the zero page
+ * is actually required. Disable the trap with care and re-enable it
+ * immediately after the access to properly trap null pointers.
+ */
+void zero_page_disable(void);
+
+#else
+
+static inline void zero_page_enable(void)
+{
+}
+
+static inline void zero_page_disable(void)
+{
+}
+
+#endif
+
+static inline bool zero_page_contains(unsigned long addr)
+{
+	return addr < PAGE_SIZE;
+}
+
+#endif /* __ZERO_PAGE_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 887f50ff003f..e5831ecdb9a7 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -182,6 +182,9 @@ config ARCH_HAS_STACK_DUMP
 config ARCH_HAS_DATA_ABORT_MASK
 	bool
 
+config ARCH_HAS_ZERO_PAGE
+	bool
+
 config HAVE_EFFICIENT_UNALIGNED_ACCESS
 	bool
 
-- 
2.20.1


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^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2020-10-15  9:12 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-14 15:08 [PATCH 1/2] ARM: mmu64: allow to disable null pointer trap on zero page Michael Tretter
2020-10-14 15:08 ` [PATCH 2/2] uimage: disable zero page when loading to SDRAM at address 0x0 Michael Tretter
2020-10-14 16:33   ` Ahmad Fatoum
2020-10-15  7:40     ` Michael Tretter
2020-10-15  8:35       ` Sascha Hauer
2020-10-15  9:12       ` Ahmad Fatoum
2020-10-14 16:29 ` [PATCH 1/2] ARM: mmu64: allow to disable null pointer trap on zero page Ahmad Fatoum
     [not found]   ` <20201015073331.GA29491@pengutronix.de>
2020-10-15  8:14     ` Ahmad Fatoum
2020-10-15  8:40       ` Michael Tretter
2020-10-15  8:44   ` Sascha Hauer

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