arch: personality independent stack top

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>

22 files changed, 28 insertions, 1 deletions

diff --git a/include/asm-alpha/a.out.h b/include/asm-alpha/a.out.h
index d97daf42753..e43cf61649a 100644
--- a/include/asm-alpha/a.out.h
+++ b/include/asm-alpha/a.out.h
@@ -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__ */
diff --git a/include/asm-arm/a.out.h b/include/asm-arm/a.out.h
index 3e5fe64c439..d7165e86df2 100644
--- a/include/asm-arm/a.out.h
+++ b/include/asm-arm/a.out.h
@@ -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
diff --git a/include/asm-arm26/a.out.h b/include/asm-arm26/a.out.h
index 9b2702c42c8..7167f54ae3f 100644
--- a/include/asm-arm26/a.out.h
+++ b/include/asm-arm26/a.out.h
@@ -29,6 +29,7 @@ struct exec
 
 #ifdef __KERNEL__
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 #endif
 
 #ifndef LIBRARY_START_TEXT
diff --git a/include/asm-avr32/a.out.h b/include/asm-avr32/a.out.h
index 50bf6e31a14..9f398ab28ed 100644
--- a/include/asm-avr32/a.out.h
+++ b/include/asm-avr32/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-cris/a.out.h b/include/asm-cris/a.out.h
index 770734ce54a..919b34a084f 100644
--- a/include/asm-cris/a.out.h
+++ b/include/asm-cris/a.out.h
@@ -8,6 +8,7 @@
 
 /* grabbed from the intel stuff  */   
 #define STACK_TOP TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 
 struct exec
diff --git a/include/asm-frv/mem-layout.h b/include/asm-frv/mem-layout.h
index a025dd4514e..aaf2a773d9d 100644
--- a/include/asm-frv/mem-layout.h
+++ b/include/asm-frv/mem-layout.h
@@ -60,6 +60,7 @@
  */
 #define BRK_BASE                        __UL(2 * 1024 * 1024 + PAGE_SIZE)
 #define STACK_TOP                       __UL(2 * 1024 * 1024)
+#define STACK_TOP_MAX   STACK_TOP
 
 /* userspace process size */
 #ifdef CONFIG_MMU
diff --git a/include/asm-h8300/a.out.h b/include/asm-h8300/a.out.h
index 3c70939f9f0..aa5d2277823 100644
--- a/include/asm-h8300/a.out.h
+++ b/include/asm-h8300/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-i386/a.out.h b/include/asm-i386/a.out.h
index ab17bb8e546..851a60f8258 100644
--- a/include/asm-i386/a.out.h
+++ b/include/asm-i386/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-ia64/ustack.h b/include/asm-ia64/ustack.h
index a349467913e..504167c35b8 100644
--- a/include/asm-ia64/ustack.h
+++ b/include/asm-ia64/ustack.h
@@ -11,6 +11,7 @@
 /* The absolute hard limit for stack size is 1/2 of the mappable space in the region */
 #define MAX_USER_STACK_SIZE     (RGN_MAP_LIMIT/2)
 #define STACK_TOP               (0x6000000000000000UL + RGN_MAP_LIMIT)
+#define STACK_TOP_MAX           STACK_TOP
 #endif
 
 /* Make a default stack size of 2GiB */
diff --git a/include/asm-m32r/a.out.h b/include/asm-m32r/a.out.h
index 9a4a5d20160..6a1b5d42f32 100644
--- a/include/asm-m32r/a.out.h
+++ b/include/asm-m32r/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-m68k/a.out.h b/include/asm-m68k/a.out.h
index eda1662773b..6fc86a221a9 100644
--- a/include/asm-m68k/a.out.h
+++ b/include/asm-m68k/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-mips/a.out.h b/include/asm-mips/a.out.h
index ef33c3f1348..1ad60ba186d 100644
--- a/include/asm-mips/a.out.h
+++ b/include/asm-mips/a.out.h
@@ -40,6 +40,7 @@ struct exec
 #ifdef CONFIG_64BIT
 #define STACK_TOP       (current->thread.mflags & MF_32BIT_ADDR ? TASK_SIZE32 : TASK_SIZE)
 #endif
+#define STACK_TOP_MAX   TASK_SIZE
 
 #endif
 
diff --git a/include/asm-parisc/a.out.h b/include/asm-parisc/a.out.h
index 2a490cc9ec9..23e2c90943e 100644
--- a/include/asm-parisc/a.out.h
+++ b/include/asm-parisc/a.out.h
@@ -23,6 +23,7 @@ struct exec
  * prumpf */
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   DEFAULT_TASK_SIZE
 
 #endif
 
diff --git a/include/asm-powerpc/a.out.h b/include/asm-powerpc/a.out.h
index c7393a97736..5c5ea83f934 100644
--- a/include/asm-powerpc/a.out.h
+++ b/include/asm-powerpc/a.out.h
@@ -26,9 +26,12 @@ struct exec
 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
                    STACK_TOP_USER32 : STACK_TOP_USER64)
 
+#define STACK_TOP_MAX STACK_TOP_USER64
+
 #else /* __powerpc64__ */
 
 #define STACK_TOP TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif /* __powerpc64__ */
 #endif /* __KERNEL__ */
diff --git a/include/asm-s390/a.out.h b/include/asm-s390/a.out.h
index 72adee6ef33..46158dcaf51 100644
--- a/include/asm-s390/a.out.h
+++ b/include/asm-s390/a.out.h
@@ -32,6 +32,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   DEFAULT_TASK_SIZE
 
 #endif
 
diff --git a/include/asm-sh/a.out.h b/include/asm-sh/a.out.h
index 6e9fca9ee33..685d0f6125f 100644
--- a/include/asm-sh/a.out.h
+++ b/include/asm-sh/a.out.h
@@ -20,6 +20,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-sh64/a.out.h b/include/asm-sh64/a.out.h
index e1995e86b66..237ee4e5b72 100644
--- a/include/asm-sh64/a.out.h
+++ b/include/asm-sh64/a.out.h
@@ -31,6 +31,7 @@ struct exec
 #ifdef __KERNEL__
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif
 
diff --git a/include/asm-sparc/a.out.h b/include/asm-sparc/a.out.h
index 9090060a23e..917e0425069 100644
--- a/include/asm-sparc/a.out.h
+++ b/include/asm-sparc/a.out.h
@@ -92,6 +92,7 @@ struct relocation_info /* used when header.a_machtype == M_SPARC */
 #include <asm/page.h>
 
 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif /* __KERNEL__ */
 
diff --git a/include/asm-sparc64/a.out.h b/include/asm-sparc64/a.out.h
index eb3b8e90b27..902e07f89a4 100644
--- a/include/asm-sparc64/a.out.h
+++ b/include/asm-sparc64/a.out.h
@@ -101,6 +101,8 @@ struct relocation_info /* used when header.a_machtype == M_SPARC */
 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
                    STACK_TOP32 : STACK_TOP64)
 
+#define STACK_TOP_MAX STACK_TOP64
+
 #endif
 
 #endif /* !(__ASSEMBLY__) */
diff --git a/include/asm-um/a.out.h b/include/asm-um/a.out.h
index 7016b893ac9..78bc9eed26b 100644
--- a/include/asm-um/a.out.h
+++ b/include/asm-um/a.out.h
@@ -17,4 +17,6 @@ extern int honeypot;
 #define STACK_TOP \
         CHOOSE_MODE((honeypot ? host_task_size : task_size), task_size)
 
+#define STACK_TOP_MAX   STACK_TOP
+
 #endif
diff --git a/include/asm-x86_64/a.out.h b/include/asm-x86_64/a.out.h
index 7255cde0653..e789300e41a 100644
--- a/include/asm-x86_64/a.out.h
+++ b/include/asm-x86_64/a.out.h
@@ -21,7 +21,8 @@ struct exec
 
 #ifdef __KERNEL__
 #include <linux/thread_info.h>
-#define STACK_TOP TASK_SIZE
+#define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   TASK_SIZE64
 #endif
 
 #endif /* __A_OUT_GNU_H__ */
diff --git a/include/asm-xtensa/a.out.h b/include/asm-xtensa/a.out.h
index ffc4dcfd6ac..05a2f67c676 100644
--- a/include/asm-xtensa/a.out.h
+++ b/include/asm-xtensa/a.out.h
@@ -17,6 +17,7 @@
 /* Note: the kernel needs the a.out definitions, even if only ELF is used. */
 
 #define STACK_TOP       TASK_SIZE
+#define STACK_TOP_MAX   STACK_TOP
 
 struct exec
 {