9 files changed, 81 insertions, 46 deletions

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 322410be573c..d2903e3bc861 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -21,6 +21,7 @@
 #include <mach/entry-macro.S>
 #include <asm/thread_notify.h>
 #include <asm/unwind.h>
+#include <asm/unistd.h>
 
 #include "entry-header.S"
 
@@ -608,33 +609,33 @@ call_fpe:
  THUMB( add     pc, r8                  )
         nop
 
-        W(mov)  pc, lr                          @ CP#0
+        movw_pc lr                              @ CP#0
         W(b)    do_fpe                          @ CP#1 (FPE)
         W(b)    do_fpe                          @ CP#2 (FPE)
-        W(mov)  pc, lr                          @ CP#3
+        movw_pc lr                              @ CP#3
 #ifdef CONFIG_CRUNCH
         b       crunch_task_enable              @ CP#4 (MaverickCrunch)
         b       crunch_task_enable              @ CP#5 (MaverickCrunch)
         b       crunch_task_enable              @ CP#6 (MaverickCrunch)
 #else
-        W(mov)  pc, lr                          @ CP#4
-        W(mov)  pc, lr                          @ CP#5
-        W(mov)  pc, lr                          @ CP#6
+        movw_pc lr                              @ CP#4
+        movw_pc lr                              @ CP#5
+        movw_pc lr                              @ CP#6
 #endif
-        W(mov)  pc, lr                          @ CP#7
-        W(mov)  pc, lr                          @ CP#8
-        W(mov)  pc, lr                          @ CP#9
+        movw_pc lr                              @ CP#7
+        movw_pc lr                              @ CP#8
+        movw_pc lr                              @ CP#9
 #ifdef CONFIG_VFP
         W(b)    do_vfp                          @ CP#10 (VFP)
         W(b)    do_vfp                          @ CP#11 (VFP)
 #else
-        W(mov)  pc, lr                          @ CP#10 (VFP)
-        W(mov)  pc, lr                          @ CP#11 (VFP)
+        movw_pc lr                              @ CP#10 (VFP)
+        movw_pc lr                              @ CP#11 (VFP)
 #endif
-        W(mov)  pc, lr                          @ CP#12
-        W(mov)  pc, lr                          @ CP#13
-        W(mov)  pc, lr                          @ CP#14 (Debug)
-        W(mov)  pc, lr                          @ CP#15 (Control)
+        movw_pc lr                              @ CP#12
+        movw_pc lr                              @ CP#13
+        movw_pc lr                              @ CP#14 (Debug)
+        movw_pc lr                              @ CP#15 (Control)
 
 #ifdef CONFIG_NEON
         .align  6
@@ -908,10 +909,10 @@ __kuser_cmpxchg:				@ 0xffff0fc0
          * A special ghost syscall is used for that (see traps.c).
          */
         stmfd   sp!, {r7, lr}
-        mov     r7, #0xff00             @ 0xfff0 into r7 for EABI
-        orr     r7, r7, #0xf0
-        swi     #0x9ffff0
+        ldr     r7, =1f                 @ it's 20 bits
+        swi     __ARM_NR_cmpxchg
         ldmfd   sp!, {r7, pc}
+1:      .word   __ARM_NR_cmpxchg
 
 #elif __LINUX_ARM_ARCH__ < 6
 
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index ac34c0d9384b..7e9ed1eea40a 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -110,6 +110,13 @@
         mov     \rd, sp, lsr #13
         mov     \rd, \rd, lsl #13
         .endm
+
+        @
+        @ 32-bit wide "mov pc, reg"
+        @
+        .macro  movw_pc, reg
+        mov     pc, \reg
+        .endm
 #else   /* CONFIG_THUMB2_KERNEL */
         .macro  svc_exit, rpsr
         clrex                                   @ clear the exclusive monitor
@@ -146,6 +153,14 @@
         lsr     \rd, \rd, #13
         mov     \rd, \rd, lsl #13
         .endm
+
+        @
+        @ 32-bit wide "mov pc, reg"
+        @
+        .macro  movw_pc, reg
+        mov     pc, \reg
+        nop
+        .endm
 #endif  /* !CONFIG_THUMB2_KERNEL */
 
 /*
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 885a7214418d..b9505aa267c0 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -97,7 +97,7 @@ __error_a:
         bl      printhex8
         adr     r0, str_a2
         bl      printascii
-        adr     r3, 3f
+        adr     r3, 4f
         ldmia   r3, {r4, r5, r6}                @ get machine desc list
         sub     r4, r3, r4                      @ get offset between virt&phys
         add     r5, r5, r4                      @ convert virt addresses to
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 790fbee92ec5..0d96d0171c05 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -328,6 +328,15 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
 }
 
 /*
+ * Fill in the task's elfregs structure for a core dump.
+ */
+int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs)
+{
+        elf_core_copy_regs(elfregs, task_pt_regs(t));
+        return 1;
+}
+
+/*
  * fill in the fpe structure for a core dump...
  */
 int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 1423a3419789..2a573d4fea24 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -1,7 +1,7 @@
 /*
  *  linux/arch/arm/kernel/signal.c
  *
- *  Copyright (C) 1995-2002 Russell King
+ *  Copyright (C) 1995-2009 Russell King
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -29,6 +29,7 @@
  */
 #define SWI_SYS_SIGRETURN       (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
 #define SWI_SYS_RT_SIGRETURN    (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
+#define SWI_SYS_RESTART         (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
 
 /*
  * With EABI, the syscall number has to be loaded into r7.
@@ -49,6 +50,18 @@ const unsigned long sigreturn_codes[7] = {
 };
 
 /*
+ * Either we support OABI only, or we have EABI with the OABI
+ * compat layer enabled.  In the later case we don't know if
+ * user space is EABI or not, and if not we must not clobber r7.
+ * Always using the OABI syscall solves that issue and works for
+ * all those cases.
+ */
+const unsigned long syscall_restart_code[2] = {
+        SWI_SYS_RESTART,        /* swi  __NR_restart_syscall */
+        0xe49df004,             /* ldr  pc, [sp], #4 */
+};
+
+/*
  * atomically swap in the new signal mask, and wait for a signal.
  */
 asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask)
@@ -645,32 +658,12 @@ static void do_signal(struct pt_regs *regs, int syscall)
                                 regs->ARM_pc -= 4;
 #else
                                 u32 __user *usp;
-                                u32 swival = __NR_restart_syscall;
 
-                                regs->ARM_sp -= 12;
+                                regs->ARM_sp -= 4;
                                 usp = (u32 __user *)regs->ARM_sp;
 
-                                /*
-                                 * Either we supports OABI only, or we have
-                                 * EABI with the OABI compat layer enabled.
-                                 * In the later case we don't know if user
-                                 * space is EABI or not, and if not we must
-                                 * not clobber r7.  Always using the OABI
-                                 * syscall solves that issue and works for
-                                 * all those cases.
-                                 */
-                                swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE;
-
-                                put_user(regs->ARM_pc, &usp[0]);
-                                /* swi __NR_restart_syscall */
-                                put_user(0xef000000 | swival, &usp[1]);
-                                /* ldr  pc, [sp], #12 */
-                                put_user(0xe49df00c, &usp[2]);
-
-                                flush_icache_range((unsigned long)usp,
-                                                   (unsigned long)(usp + 3));
-
-                                regs->ARM_pc = regs->ARM_sp + 4;
+                                put_user(regs->ARM_pc, usp);
+                                regs->ARM_pc = KERN_RESTART_CODE;
 #endif
                         }
                 }
diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h
index 27beece15502..6fcfe8398aa4 100644
--- a/arch/arm/kernel/signal.h
+++ b/arch/arm/kernel/signal.h
@@ -1,12 +1,14 @@
 /*
  *  linux/arch/arm/kernel/signal.h
  *
- *  Copyright (C) 2005 Russell King.
+ *  Copyright (C) 2005-2009 Russell King.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #define KERN_SIGRETURN_CODE     (CONFIG_VECTORS_BASE + 0x00000500)
+#define KERN_RESTART_CODE       (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
 
 extern const unsigned long sigreturn_codes[7];
+extern const unsigned long syscall_restart_code[2];
diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
index d3831f616ee9..9ab4149bd983 100644
--- a/arch/arm/kernel/smp_scu.c
+++ b/arch/arm/kernel/smp_scu.c
@@ -37,6 +37,10 @@ void __init scu_enable(void __iomem *scu_base)
         u32 scu_ctrl;
 
         scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
+        /* already enabled? */
+        if (scu_ctrl & 1)
+                return;
+
         scu_ctrl |= 1;
         __raw_writel(scu_ctrl, scu_base + SCU_CTRL);
 
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index f838f36eb702..3f361a783f43 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -1,7 +1,7 @@
 /*
  *  linux/arch/arm/kernel/traps.c
  *
- *  Copyright (C) 1995-2002 Russell King
+ *  Copyright (C) 1995-2009 Russell King
  *  Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
  *
  * This program is free software; you can redistribute it and/or modify
@@ -528,7 +528,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
          * __kuser_cmpxchg code in entry-armv.S should be aware of its
          * existence.  Don't ever use this from user code.
          */
-        case 0xfff0:
+        case NR(cmpxchg):
         for (;;) {
                 extern void do_DataAbort(unsigned long addr, unsigned int fsr,
                                          struct pt_regs *regs);
@@ -573,7 +573,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs)
                    if not implemented, rather than raising SIGILL.  This
                    way the calling program can gracefully determine whether
                    a feature is supported.  */
-                if (no <= 0x7ff)
+                if ((no & 0xffff) <= 0x7ff)
                         return -ENOSYS;
                 break;
         }
@@ -751,6 +751,8 @@ void __init early_trap_init(void)
          */
         memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes,
                sizeof(sigreturn_codes));
+        memcpy((void *)KERN_RESTART_CODE, syscall_restart_code,
+               sizeof(syscall_restart_code));
 
         flush_icache_range(vectors, vectors + PAGE_SIZE);
         modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 39baf1128bfa..786ac2b6914a 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -26,6 +26,15 @@
  * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
  */
 
+#if !defined (__ARM_EABI__)
+#warning Your compiler does not have EABI support.
+#warning    ARM unwind is known to compile only with EABI compilers.
+#warning    Change compiler or disable ARM_UNWIND option.
+#elif (__GNUC__ == 4 && __GNUC_MINOR__ <= 2)
+#warning Your compiler is too buggy; it is known to not compile ARM unwind support.
+#warning    Change compiler or disable ARM_UNWIND option.
+#endif
+
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>