[PATCH] ARM: remove some entry initialisation asm code

Convert the trivial vector entry initialisation code to C code.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bb27c31..37723bf 100644 (file)
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -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
@@ -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/traps.c b/arch/arm/kernel/traps.c
index 6e31718..0078aeb 100644 (file)
--- 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);
 }