Automatic merge of kernel.org:/home/rmk/linux-2.6-rmk.git

6 files changed, 124 insertions, 187 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 07a56ff61494..4a2af55e134b 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -31,8 +31,3 @@ head-y			:= head.o
 obj-$(CONFIG_DEBUG_LL)  += debug.o
 
 extra-y := $(head-y) init_task.o vmlinux.lds
-
-# Spell out some dependencies that aren't automatically figured out
-$(obj)/entry-armv.o:    $(obj)/entry-header.S include/asm-arm/constants.h
-$(obj)/entry-common.o:  $(obj)/entry-header.S include/asm-arm/constants.h \
-                        $(obj)/calls.S
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 99d43259ff89..c1ff4d1f1bfd 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -64,6 +64,26 @@ int main(void)
   DEFINE(TI_VFPSTATE,           offsetof(struct thread_info, vfpstate));
   DEFINE(TI_IWMMXT_STATE,       (offsetof(struct thread_info, fpstate)+4)&~7);
   BLANK();
+  DEFINE(S_R0,                  offsetof(struct pt_regs, ARM_r0));
+  DEFINE(S_R1,                  offsetof(struct pt_regs, ARM_r1));
+  DEFINE(S_R2,                  offsetof(struct pt_regs, ARM_r2));
+  DEFINE(S_R3,                  offsetof(struct pt_regs, ARM_r3));
+  DEFINE(S_R4,                  offsetof(struct pt_regs, ARM_r4));
+  DEFINE(S_R5,                  offsetof(struct pt_regs, ARM_r5));
+  DEFINE(S_R6,                  offsetof(struct pt_regs, ARM_r6));
+  DEFINE(S_R7,                  offsetof(struct pt_regs, ARM_r7));
+  DEFINE(S_R8,                  offsetof(struct pt_regs, ARM_r8));
+  DEFINE(S_R9,                  offsetof(struct pt_regs, ARM_r9));
+  DEFINE(S_R10,                 offsetof(struct pt_regs, ARM_r10));
+  DEFINE(S_FP,                  offsetof(struct pt_regs, ARM_fp));
+  DEFINE(S_IP,                  offsetof(struct pt_regs, ARM_ip));
+  DEFINE(S_SP,                  offsetof(struct pt_regs, ARM_sp));
+  DEFINE(S_LR,                  offsetof(struct pt_regs, ARM_lr));
+  DEFINE(S_PC,                  offsetof(struct pt_regs, ARM_pc));
+  DEFINE(S_PSR,                 offsetof(struct pt_regs, ARM_cpsr));
+  DEFINE(S_OLD_R0,              offsetof(struct pt_regs, ARM_ORIG_r0));
+  DEFINE(S_FRAME_SIZE,          sizeof(struct pt_regs));
+  BLANK();
 #if __LINUX_ARM_ARCH__ >= 6
   DEFINE(MM_CONTEXT_ID,         offsetof(struct mm_struct, context.id));
   BLANK();
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bb27c317d94b..2a5c3fe09a95 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -14,12 +14,12 @@
  *  it to save wrong values...  Be aware!
  */
 #include <linux/config.h>
-#include <linux/init.h>
 
-#include <asm/thread_info.h>
 #include <asm/glue.h>
-#include <asm/ptrace.h>
 #include <asm/vfpmacros.h>
+#include <asm/hardware.h>               @ should be moved into entry-macro.S
+#include <asm/arch/irqs.h>              @ should be moved into entry-macro.S
+#include <asm/arch/entry-macro.S>
 
 #include "entry-header.S"
 
@@ -118,7 +118,7 @@ __dabt_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-        disable_irq r0
+        disable_irq
 
         @
         @ restore SPSR and restart the instruction
@@ -198,7 +198,7 @@ __und_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-1:      disable_irq r0
+1:      disable_irq
 
         @
         @ restore SPSR and restart the instruction
@@ -232,7 +232,7 @@ __pabt_svc:
         @
         @ IRQs off again before pulling preserved data off the stack
         @
-        disable_irq r0
+        disable_irq
 
         @
         @ restore SPSR and restart the instruction
@@ -316,7 +316,7 @@ __dabt_usr:
         @
         @ IRQs on, then call the main handler
         @
-        enable_irq r2
+        enable_irq
         mov     r2, sp
         adr     lr, ret_from_exception
         b       do_DataAbort
@@ -418,7 +418,7 @@ call_fpe:
         movcss  r7, r5, lsr #(TIF_USING_IWMMXT + 1)
         bcs     iwmmxt_task_enable
 #endif
-        enable_irq r7
+        enable_irq
         add     pc, pc, r8, lsr #6
         mov     r0, r0
 
@@ -472,7 +472,7 @@ fpundefinstr:
 __pabt_usr:
         usr_entry abt
 
-        enable_irq r0                           @ Enable interrupts
+        enable_irq                              @ Enable interrupts
         mov     r0, r2                          @ address (pc)
         mov     r1, sp                          @ regs
         bl      do_PrefetchAbort                @ call abort handler
@@ -522,8 +522,9 @@ ENTRY(__switch_to)
 /*
  * Vector stubs.
  *
- * This code is copied to 0x200 or 0xffff0200 so we can use branches in the
- * vectors, rather than ldr's.
+ * This code is copied to 0xffff0200 so we can use branches in the
+ * vectors, rather than ldr's.  Note that this code must not
+ * exceed 0x300 bytes.
  *
  * Common stub entry macro:
  *   Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC
@@ -544,7 +545,7 @@ vector_\name:
         @
         mrs     r13, cpsr
         bic     r13, r13, #MODE_MASK
-        orr     r13, r13, #MODE_SVC
+        orr     r13, r13, #SVC_MODE
         msr     spsr_cxsf, r13                  @ switch to SVC_32 mode
 
         and     lr, lr, #15
@@ -552,6 +553,7 @@ vector_\name:
         movs    pc, lr                          @ Changes mode and branches
         .endm
 
+        .globl  __stubs_start
 __stubs_start:
 /*
  * Interrupt dispatcher
@@ -686,37 +688,24 @@ vector_addrexcptn:
 .LCsabt:
         .word   __temp_abt
 
+        .globl  __stubs_end
 __stubs_end:
 
-        .equ    __real_stubs_start, .LCvectors + 0x200
+        .equ    stubs_offset, __vectors_start + 0x200 - __stubs_start
 
-.LCvectors:
+        .globl  __vectors_start
+__vectors_start:
         swi     SYS_ERROR0
-        b       __real_stubs_start + (vector_und - __stubs_start)
-        ldr     pc, __real_stubs_start + (.LCvswi - __stubs_start)
-        b       __real_stubs_start + (vector_pabt - __stubs_start)
-        b       __real_stubs_start + (vector_dabt - __stubs_start)
-        b       __real_stubs_start + (vector_addrexcptn - __stubs_start)
-        b       __real_stubs_start + (vector_irq - __stubs_start)
-        b       __real_stubs_start + (vector_fiq - __stubs_start)
-
-ENTRY(__trap_init)
-        stmfd   sp!, {r4 - r6, lr}
-
-        mov     r0, #0xff000000
-        orr     r0, r0, #0x00ff0000             @ high vectors position
-        adr     r1, .LCvectors                  @ set up the vectors
-        ldmia   r1, {r1, r2, r3, r4, r5, r6, ip, lr}
-        stmia   r0, {r1, r2, r3, r4, r5, r6, ip, lr}
-
-        add     r2, r0, #0x200
-        adr     r0, __stubs_start               @ copy stubs to 0x200
-        adr     r1, __stubs_end
-1:      ldr     r3, [r0], #4
-        str     r3, [r2], #4
-        cmp     r0, r1
-        blt     1b
-        LOADREGS(fd, sp!, {r4 - r6, pc})
+        b       vector_und + stubs_offset
+        ldr     pc, .LCvswi + stubs_offset
+        b       vector_pabt + stubs_offset
+        b       vector_dabt + stubs_offset
+        b       vector_addrexcptn + stubs_offset
+        b       vector_irq + stubs_offset
+        b       vector_fiq + stubs_offset
+
+        .globl  __vectors_end
+__vectors_end:
 
         .data
 
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 53a7e0dea44d..3f8d0e3aefab 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,19 +9,10 @@
  */
 #include <linux/config.h>
 
-#include <asm/thread_info.h>
-#include <asm/ptrace.h>
 #include <asm/unistd.h>
 
 #include "entry-header.S"
 
-/* 
- * We rely on the fact that R0 is at the bottom of the stack (due to
- * slow/fast restore user regs).
- */
-#if S_R0 != 0
-#error "Please fix"
-#endif
 
         .align  5
 /*
@@ -30,11 +21,19 @@
  * stack.
  */
 ret_fast_syscall:
-        disable_irq r1                          @ disable interrupts
+        disable_irq                             @ disable interrupts
         ldr     r1, [tsk, #TI_FLAGS]
         tst     r1, #_TIF_WORK_MASK
         bne     fast_work_pending
-        fast_restore_user_regs
+
+        @ fast_restore_user_regs
+        ldr     r1, [sp, #S_OFF + S_PSR]        @ get calling cpsr
+        ldr     lr, [sp, #S_OFF + S_PC]!        @ get pc
+        msr     spsr_cxsf, r1                   @ save in spsr_svc
+        ldmdb   sp, {r1 - lr}^                  @ get calling r1 - lr
+        mov     r0, r0
+        add     sp, sp, #S_FRAME_SIZE - S_PC
+        movs    pc, lr                          @ return & move spsr_svc into cpsr
 
 /*
  * Ok, we need to do extra processing, enter the slow path.
@@ -49,7 +48,7 @@ work_pending:
         mov     r0, sp                          @ 'regs'
         mov     r2, why                         @ 'syscall'
         bl      do_notify_resume
-        disable_irq r1                          @ disable interrupts
+        disable_irq                             @ disable interrupts
         b       no_work_pending
 
 work_resched:
@@ -59,12 +58,19 @@ work_resched:
  */
 ENTRY(ret_to_user)
 ret_slow_syscall:
-        disable_irq r1                          @ disable interrupts
+        disable_irq                             @ disable interrupts
         ldr     r1, [tsk, #TI_FLAGS]
         tst     r1, #_TIF_WORK_MASK
         bne     work_pending
 no_work_pending:
-        slow_restore_user_regs
+        @ slow_restore_user_regs
+        ldr     r1, [sp, #S_PSR]                @ get calling cpsr
+        ldr     lr, [sp, #S_PC]!                @ get pc
+        msr     spsr_cxsf, r1                   @ save in spsr_svc
+        ldmdb   sp, {r0 - lr}^                  @ get calling r1 - lr
+        mov     r0, r0
+        add     sp, sp, #S_FRAME_SIZE - S_PC
+        movs    pc, lr                          @ return & move spsr_svc into cpsr
 
 /*
  * This is how we return from a fork.
@@ -116,9 +122,26 @@ ENTRY(ret_from_fork)
 
         .align  5
 ENTRY(vector_swi)
-        save_user_regs
+        sub     sp, sp, #S_FRAME_SIZE
+        stmia   sp, {r0 - r12}                  @ Calling r0 - r12
+        add     r8, sp, #S_PC
+        stmdb   r8, {sp, lr}^                   @ Calling sp, lr
+        mrs     r8, spsr                        @ called from non-FIQ mode, so ok.
+        str     lr, [sp, #S_PC]                 @ Save calling PC
+        str     r8, [sp, #S_PSR]                @ Save CPSR
+        str     r0, [sp, #S_OLD_R0]             @ Save OLD_R0
         zero_fp
-        get_scno
+
+        /*
+         * Get the system call number.
+         */
+#ifdef CONFIG_ARM_THUMB
+        tst     r8, #PSR_T_BIT                  @ this is SPSR from save_user_regs
+        addne   scno, r7, #__NR_SYSCALL_BASE    @ put OS number in
+        ldreq   scno, [lr, #-4]
+#else
+        ldr     scno, [lr, #-4]                 @ get SWI instruction
+#endif
         arm710_bug_check scno, ip
 
 #ifdef CONFIG_ALIGNMENT_TRAP
@@ -126,14 +149,14 @@ ENTRY(vector_swi)
         ldr     ip, [ip]
         mcr     p15, 0, ip, c1, c0              @ update control register
 #endif
-        enable_irq ip
+        enable_irq
 
         str     r4, [sp, #-S_OFF]!              @ push fifth arg
 
         get_thread_info tsk
         ldr     ip, [tsk, #TI_FLAGS]            @ check for syscall tracing
         bic     scno, scno, #0xff000000         @ mask off SWI op-code
-        eor     scno, scno, #OS_NUMBER << 20    @ check OS number
+        eor     scno, scno, #__NR_SYSCALL_BASE  @ check OS number
         adr     tbl, sys_call_table             @ load syscall table pointer
         tst     ip, #_TIF_SYSCALL_TRACE         @ are we tracing syscalls?
         bne     __sys_trace
@@ -144,8 +167,8 @@ ENTRY(vector_swi)
 
         add     r1, sp, #S_OFF
 2:      mov     why, #0                         @ no longer a real syscall
-        cmp     scno, #ARMSWI_OFFSET
-        eor     r0, scno, #OS_NUMBER << 20      @ put OS number back
+        cmp     scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
+        eor     r0, scno, #__NR_SYSCALL_BASE    @ put OS number back
         bcs     arm_syscall     
         b       sys_ni_syscall                  @ not private func
 
@@ -190,7 +213,7 @@ ENTRY(sys_call_table)
 @ r5 = syscall table
                 .type   sys_syscall, #function
 sys_syscall:
-                eor     scno, r0, #OS_NUMBER << 20
+                eor     scno, r0, #__NR_SYSCALL_BASE
                 cmp     scno, #__NR_syscall - __NR_SYSCALL_BASE
                 cmpne   scno, #NR_syscalls      @ check range
                 stmloia sp, {r5, r6}            @ shuffle args
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 4039d8c120b5..a3d40a0e2b04 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -1,24 +1,11 @@
-#include <linux/config.h> /* for CONFIG_ARCH_xxxx */
+#include <linux/config.h>
+#include <linux/init.h>
 #include <linux/linkage.h>
 
 #include <asm/assembler.h>
 #include <asm/constants.h>
 #include <asm/errno.h>
-#include <asm/hardware.h>
-#include <asm/arch/irqs.h>
-#include <asm/arch/entry-macro.S>
-
-#ifndef MODE_SVC
-#define MODE_SVC 0x13
-#endif
-
-        .macro  zero_fp
-#ifdef CONFIG_FRAME_POINTER
-        mov     fp, #0
-#endif
-        .endm
-
-        .text
+#include <asm/thread_info.h>
 
 @ Bad Abort numbers
 @ -----------------
@@ -29,113 +16,44 @@
 #define BAD_IRQ         3
 #define BAD_UNDEFINSTR  4
 
-#define PT_TRACESYS     0x00000002
-
-@ OS version number used in SWIs
-@  RISC OS is 0
-@  RISC iX is 8
 @
-#define OS_NUMBER       9
-#define ARMSWI_OFFSET   0x000f0000
-
+@ Most of the stack format comes from struct pt_regs, but with
+@ the addition of 8 bytes for storing syscall args 5 and 6.
 @
-@ Stack format (ensured by USER_* and SVC_*)
-@
-#define S_FRAME_SIZE    72
-#define S_OLD_R0        68
-#define S_PSR           64
-
-#define S_PC            60
-#define S_LR            56
-#define S_SP            52
-#define S_IP            48
-#define S_FP            44
-#define S_R10           40
-#define S_R9            36
-#define S_R8            32
-#define S_R7            28
-#define S_R6            24
-#define S_R5            20
-#define S_R4            16
-#define S_R3            12
-#define S_R2            8
-#define S_R1            4
-#define S_R0            0
 #define S_OFF           8
 
-        .macro  set_cpsr_c, reg, mode
-        msr     cpsr_c, \mode
+/* 
+ * The SWI code relies on the fact that R0 is at the bottom of the stack
+ * (due to slow/fast restore user regs).
+ */
+#if S_R0 != 0
+#error "Please fix"
+#endif
+
+        .macro  zero_fp
+#ifdef CONFIG_FRAME_POINTER
+        mov     fp, #0
+#endif
         .endm
 
 #if __LINUX_ARM_ARCH__ >= 6
-        .macro  disable_irq, temp
+        .macro  disable_irq
         cpsid   i
         .endm
 
-        .macro  enable_irq, temp
+        .macro  enable_irq
         cpsie   i
         .endm
 #else
-        .macro  disable_irq, temp
-        set_cpsr_c \temp, #PSR_I_BIT | MODE_SVC
+        .macro  disable_irq
+        msr     cpsr_c, #PSR_I_BIT | SVC_MODE
         .endm
 
-        .macro  enable_irq, temp
-        set_cpsr_c \temp, #MODE_SVC
+        .macro  enable_irq
+        msr     cpsr_c, #SVC_MODE
         .endm
 #endif
 
-        .macro  save_user_regs
-        sub     sp, sp, #S_FRAME_SIZE
-        stmia   sp, {r0 - r12}                  @ Calling r0 - r12
-        add     r8, sp, #S_PC
-        stmdb   r8, {sp, lr}^                   @ Calling sp, lr
-        mrs     r8, spsr                        @ called from non-FIQ mode, so ok.
-        str     lr, [sp, #S_PC]                 @ Save calling PC
-        str     r8, [sp, #S_PSR]                @ Save CPSR
-        str     r0, [sp, #S_OLD_R0]             @ Save OLD_R0
-        .endm
-
-        .macro  restore_user_regs
-        ldr     r1, [sp, #S_PSR]                @ Get calling cpsr
-        disable_irq ip                          @ disable IRQs
-        ldr     lr, [sp, #S_PC]!                @ Get PC
-        msr     spsr_cxsf, r1                   @ save in spsr_svc
-        ldmdb   sp, {r0 - lr}^                  @ Get calling r0 - lr
-        mov     r0, r0
-        add     sp, sp, #S_FRAME_SIZE - S_PC
-        movs    pc, lr                          @ return & move spsr_svc into cpsr
-        .endm
-
-/*
- * Must be called with IRQs already disabled.
- */
-        .macro  fast_restore_user_regs
-        ldr     r1, [sp, #S_OFF + S_PSR]        @ get calling cpsr
-        ldr     lr, [sp, #S_OFF + S_PC]!        @ get pc
-        msr     spsr_cxsf, r1                   @ save in spsr_svc
-        ldmdb   sp, {r1 - lr}^                  @ get calling r1 - lr
-        mov     r0, r0
-        add     sp, sp, #S_FRAME_SIZE - S_PC
-        movs    pc, lr                          @ return & move spsr_svc into cpsr
-        .endm
-
-/*
- * Must be called with IRQs already disabled.
- */
-        .macro  slow_restore_user_regs
-        ldr     r1, [sp, #S_PSR]                @ get calling cpsr
-        ldr     lr, [sp, #S_PC]!                @ get pc
-        msr     spsr_cxsf, r1                   @ save in spsr_svc
-        ldmdb   sp, {r0 - lr}^                  @ get calling r1 - lr
-        mov     r0, r0
-        add     sp, sp, #S_FRAME_SIZE - S_PC
-        movs    pc, lr                          @ return & move spsr_svc into cpsr
-        .endm
-
-        .macro  mask_pc, rd, rm
-        .endm
-
         .macro  get_thread_info, rd
         mov     \rd, sp, lsr #13
         mov     \rd, \rd, lsl #13
@@ -165,18 +83,3 @@ scno	.req	r7		@ syscall number
 tbl     .req    r8              @ syscall table pointer
 why     .req    r8              @ Linux syscall (!= 0)
 tsk     .req    r9              @ current thread_info
-
-/*
- * Get the system call number.
- */
-        .macro  get_scno
-#ifdef CONFIG_ARM_THUMB
-        tst     r8, #PSR_T_BIT          @ this is SPSR from save_user_regs
-        addne   scno, r7, #OS_NUMBER << 20 @ put OS number in
-        ldreq   scno, [lr, #-4]
-
-#else
-        mask_pc lr, lr
-        ldr     scno, [lr, #-4]         @ get SWI instruction
-#endif
-        .endm
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 6e31718f6008..0078aeb85737 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -578,9 +578,16 @@ EXPORT_SYMBOL(abort);
 
 void __init trap_init(void)
 {
-        extern void __trap_init(void);
+        extern char __stubs_start[], __stubs_end[];
+        extern char __vectors_start[], __vectors_end[];
 
-        __trap_init();
+        /*
+         * Copy the vectors and stubs (in entry-armv.S) into the
+         * vector page, mapped at 0xffff0000, and ensure these are
+         * visible to the instruction stream.
+         */
+        memcpy((void *)0xffff0000, __vectors_start, __vectors_end - __vectors_start);
+        memcpy((void *)0xffff0200, __stubs_start, __stubs_end - __stubs_start);
         flush_icache_range(0xffff0000, 0xffff0000 + PAGE_SIZE);
         modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
 }