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authorAl Viro <viro@ftp.linux.org.uk>2011-08-18 21:10:19 +0200
committerRichard Weinberger <richard@nod.at>2011-11-02 14:15:19 +0100
commitc7ea591c91162a203a5961d69f5c86a6ef9d50c1 (patch)
tree06fd34b8f1b2009c3266b587b6024c62db6920fe /arch/x86/um/asm
parentum: merge HOST_... of registers common on i386 and amd64 (diff)
downloadlinux-c7ea591c91162a203a5961d69f5c86a6ef9d50c1.tar.xz
linux-c7ea591c91162a203a5961d69f5c86a6ef9d50c1.zip
um: increase stack growth cushion in pagefault
analog of [PATCH] i386: let usermode execute the "enter" instruction from circa 2006. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/x86/um/asm')
-rw-r--r--arch/x86/um/asm/processor.h3
-rw-r--r--arch/x86/um/asm/processor_32.h3
-rw-r--r--arch/x86/um/asm/processor_64.h3
3 files changed, 3 insertions, 6 deletions
diff --git a/arch/x86/um/asm/processor.h b/arch/x86/um/asm/processor.h
index d3ac1cecf0f4..f34c4b2d09f3 100644
--- a/arch/x86/um/asm/processor.h
+++ b/arch/x86/um/asm/processor.h
@@ -10,6 +10,9 @@
# include "processor_64.h"
#endif
+#define ARCH_IS_STACKGROW(address) \
+ (address + 65536 + 32 * sizeof(unsigned long) >= UPT_SP(&current->thread.regs.regs))
+
#include <asm/processor-generic.h>
#endif
diff --git a/arch/x86/um/asm/processor_32.h b/arch/x86/um/asm/processor_32.h
index ae0d189aafcf..e5b72faea0f6 100644
--- a/arch/x86/um/asm/processor_32.h
+++ b/arch/x86/um/asm/processor_32.h
@@ -63,9 +63,6 @@ static inline void rep_nop(void)
#define current_text_addr() \
({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
-#define ARCH_IS_STACKGROW(address) \
- (address + 32 >= UPT_SP(&current->thread.regs.regs))
-
#define KSTK_EIP(tsk) KSTK_REG(tsk, EIP)
#define KSTK_ESP(tsk) KSTK_REG(tsk, UESP)
#define KSTK_EBP(tsk) KSTK_REG(tsk, EBP)
diff --git a/arch/x86/um/asm/processor_64.h b/arch/x86/um/asm/processor_64.h
index 6db812b24f48..0186c61d0a7e 100644
--- a/arch/x86/um/asm/processor_64.h
+++ b/arch/x86/um/asm/processor_64.h
@@ -42,9 +42,6 @@ static inline void arch_copy_thread(struct arch_thread *from,
#define current_text_addr() \
({ void *pc; __asm__("movq $1f,%0\n1:":"=g" (pc)); pc; })
-#define ARCH_IS_STACKGROW(address) \
- (address + 128 >= UPT_SP(&current->thread.regs.regs))
-
#define KSTK_EIP(tsk) KSTK_REG(tsk, RIP)
#define KSTK_ESP(tsk) KSTK_REG(tsk, RSP)