arch: personality independent stack top (b111757c) · Commits · 戴 / test

New arch macro STACK_TOP_MAX it gives the larges valid stack address for the architecture in question. It differs from STACK_TOP in that it will not distinguish between personalities but will always return the largest possible address. This is used to create the initial stack on execve, which we will move down to the proper location once the binfmt code has figured out where that is. Signed-off-by:

Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by:

Ollie Wild <aaw@google.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

include/asm-alpha/a.out.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -101,6 +101,8 @@ struct exec
		#define STACK_TOP \
		(current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)

		#define STACK_TOP_MAX 0x00120000000UL

		#endif

		#endif /* __A_OUT_GNU_H__ */

include/asm-arm/a.out.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ struct exec
		#ifdef __KERNEL__
		#define STACK_TOP ((current->personality == PER_LINUX_32BIT) ? \
		TASK_SIZE : TASK_SIZE_26)
		#define STACK_TOP_MAX TASK_SIZE
		#endif

		#ifndef LIBRARY_START_TEXT

include/asm-arm26/a.out.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ struct exec

		#ifdef __KERNEL__
		#define STACK_TOP TASK_SIZE
		#define STACK_TOP_MAX STACK_TOP
		#endif

		#ifndef LIBRARY_START_TEXT

include/asm-avr32/a.out.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,7 @@ struct exec
		#ifdef __KERNEL__

		#define STACK_TOP TASK_SIZE
		#define STACK_TOP_MAX STACK_TOP

		#endif

include/asm-cris/a.out.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,7 @@

		/* grabbed from the intel stuff */
		#define STACK_TOP TASK_SIZE
		#define STACK_TOP_MAX STACK_TOP


		struct exec

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