vserver 1.9.3

[linux-2.6.git] / include / asm-arm / elf.h

diff --git a/include/asm-arm/elf.h b/include/asm-arm/elf.h
index b67e06c..29533be 100644 (file)
--- a/include/asm-arm/elf.h
+++ b/include/asm-arm/elf.h
@@ -1,6 +1,8 @@
 #ifndef __ASMARM_ELF_H
 #define __ASMARM_ELF_H
 
+#include <linux/config.h>
+
 /*
  * ELF register definitions..
  */
@@ -14,6 +16,7 @@ typedef unsigned long elf_freg_t[3];
 
 #define EM_ARM 40
 #define EF_ARM_APCS26 0x08
+#define EF_ARM_SOFT_FLOAT 0x200
 
 #define R_ARM_NONE     0
 #define R_ARM_PC24     1
@@ -91,6 +94,8 @@ extern char elf_platform[];
        (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
          ((x)->e_flags & EF_ARM_APCS26) == 0)
 
+#ifndef CONFIG_IWMMXT
+
 /* Old NetWinder binaries were compiled in such a way that the iBCS
    heuristic always trips on them.  Until these binaries become uncommon
    enough not to care, don't trust the `ibcs' flag here.  In any case
@@ -99,6 +104,28 @@ extern char elf_platform[];
 #define SET_PERSONALITY(ex,ibcs2) \
        set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
 
+#else
+
+/*
+ * All iWMMXt capable CPUs don't support 26-bit mode.  Yet they can run
+ * legacy binaries which used to contain FPA11 floating point instructions
+ * that have always been emulated by the kernel.  PFA11 and iWMMXt overlap
+ * on coprocessor 1 space though.  We therefore must decide if given task
+ * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
+ * at all times for the prefetch exception handler to catch FPA11 opcodes
+ * and emulate them.  The best indication to discriminate those two cases
+ * is the SOFT_FLOAT flag in the ELF header.
+ */
+
+#define SET_PERSONALITY(ex,ibcs2) \
+do { \
+       set_personality(PER_LINUX_32BIT); \
+       if ((ex).e_flags & EF_ARM_SOFT_FLOAT) \
+               set_thread_flag(TIF_USING_IWMMXT); \
+} while (0)
+
+#endif
+
 #endif
 
 #endif