arm: relocate_code(): do not set register useless

[platform/kernel/u-boot.git] / arch / arm / cpu / pxa / start.S

diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S
index bf8510e..53391ec 100644 (file)
--- a/arch/arm/cpu/pxa/start.S
+++ b/arch/arm/cpu/pxa/start.S
@@ -33,7 +33,6 @@
 #include <config.h>
 #include <version.h>
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/macro.h>
 
 /* takes care the CP15 update has taken place */
 .macro CPWAIT reg
@@ -221,6 +220,7 @@ zerojmp:
 /* Set stackpointer in internal RAM to call board_init_f */
 call_board_init_f:
        ldr     sp, =(CONFIG_SYS_INIT_SP_ADDR)
+       bic     sp, sp, #7 /* 8-byte alignment for ABI compliance */
        ldr     r0,=0x00000000
        bl      board_init_f
 
@@ -238,24 +238,23 @@ relocate_code:
        mov     r4, r0  /* save addr_sp */
        mov     r5, r1  /* save addr of gd */
        mov     r6, r2  /* save addr of destination */
-       mov     r7, r2  /* save addr of destination */
 
        /* Set up the stack                                                 */
 stack_setup:
        mov     sp, r4
 
        adr     r0, _start
+       cmp     r0, r6
+       beq     clear_bss               /* skip relocation */
+       mov     r1, r6                  /* r1 <- scratch for copy_loop */
        ldr     r2, _TEXT_BASE
        ldr     r3, _bss_start_ofs
        add     r2, r0, r3              /* r2 <- source end address         */
-       cmp     r0, r6
-       beq     clear_bss
 
-#ifndef CONFIG_SKIP_RELOCATE_UBOOT
        stmfd sp!, {r0-r12}
 copy_loop:
        ldmia   r0!, {r3-r5, r7-r11}    /* copy from source address [r0]    */
-       stmia   r6!, {r3-r5, r7-r11}    /* copy to   target address [r1]    */
+       stmia   r1!, {r3-r5, r7-r11}    /* copy to   target address [r1]    */
        cmp     r0, r2                  /* until source end address [r2]    */
        blo     copy_loop
        ldmfd sp!, {r0-r12}
@@ -265,7 +264,7 @@ copy_loop:
         * fix .rel.dyn relocations
         */
        ldr     r0, _TEXT_BASE          /* r0 <- Text base */
-       sub     r9, r7, r0              /* r9 <- relocation offset */
+       sub     r9, r6, r0              /* r9 <- relocation offset */
        ldr     r10, _dynsym_start_ofs  /* r10 <- sym table ofs */
        add     r10, r10, r0            /* r10 <- sym table in FLASH */
        ldr     r2, _rel_dyn_start_ofs  /* r2 <- rel dyn start ofs */
@@ -299,15 +298,14 @@ fixnext:
        add     r2, r2, #8      /* each rel.dyn entry is 8 bytes */
        cmp     r2, r3
        blo     fixloop
-#endif
-#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
+#endif /* #ifndef CONFIG_PRELOADER */
 
 clear_bss:
 #ifndef CONFIG_PRELOADER
        ldr     r0, _bss_start_ofs
        ldr     r1, _bss_end_ofs
        ldr     r3, _TEXT_BASE          /* Text base */
-       mov     r4, r7                  /* reloc addr */
+       mov     r4, r6                  /* reloc addr */
        add     r0, r0, r4
        add     r1, r1, r4
        mov     r2, #0x00000000         /* clear                            */
@@ -316,7 +314,7 @@ clbss_l:str r2, [r0]                /* clear loop...                    */
        add     r0, r0, #4
        cmp     r0, r1
        bne     clbss_l
-#endif
+#endif /* #ifndef CONFIG_PRELOADER */
 
 /*
  * We are done. Do not return, instead branch to second part of board
@@ -332,18 +330,16 @@ _start_oneboot_ofs
        ldr     r0, _board_init_r_ofs
        adr     r1, _start
        add     lr, r0, r1
-#ifndef CONFIG_SKIP_RELOCATE_UBOOT
        add     lr, lr, r9
-#endif
        /* setup parameters for board_init_r */
        mov     r0, r5          /* gd_t */
-       mov     r1, r7          /* dest_addr */
+       mov     r1, r6          /* dest_addr */
        /* jump to it ... */
        mov     pc, lr
 
 _board_init_r_ofs:
        .word board_init_r - _start
-#endif
+#endif /* CONFIG_ONENAND_IPL */
 
 _rel_dyn_start_ofs:
        .word __rel_dyn_start - _start
@@ -352,7 +348,7 @@ _rel_dyn_end_ofs:
 _dynsym_start_ofs:
        .word __dynsym_start - _start
 
-#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
+#else /* CONFIG_PRELOADER */
 
 /****************************************************************************/
 /*                                                                         */
@@ -377,7 +373,7 @@ reset:
        /* Start OneNAND IPL */
        ldr     pc, =start_oneboot
 
-#endif /* #if !defined(CONFIG_ONENAND_IPL) */
+#endif /* CONFIG_PRELOADER */
 
 #ifndef CONFIG_PRELOADER
 /****************************************************************************/
@@ -419,13 +415,7 @@ reset:
        stmia   sp, {r0 - r12}                  /* Calling r0-r12           */
        add     r8, sp, #S_PC
 
-#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
-       ldr     r2, _armboot_start
-       sub     r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
-       sub     r2, r2, #(GENERATED_GBL_DATA_SIZE+8)    @ set base 2 words into abort stack
-#else
        ldr     r2, IRQ_STACK_START_IN
-#endif
        ldmia   r2, {r2 - r4}                   /* get pc, cpsr, old_r0     */
        add     r0, sp, #S_FRAME_SIZE           /* restore sp_SVC           */
 
@@ -460,13 +450,7 @@ reset:
        .endm
 
        .macro get_bad_stack
-#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
-       ldr     r13, _armboot_start             @ setup our mode stack
-       sub     r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
-       sub     r13, r13, #(GENERATED_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
-#else
        ldr     r13, IRQ_STACK_START_IN         @ setup our mode stack
-#endif
 
        str     lr, [r13]                       @ save caller lr / spsr
        mrs     lr, spsr
@@ -485,7 +469,7 @@ reset:
        .macro get_fiq_stack                    @ setup FIQ stack
        ldr     sp, FIQ_STACK_START
        .endm
-#endif /* CONFIG_PRELOADER */
+#endif /* CONFIG_PRELOADER
 
 
 /****************************************************************************/
@@ -499,7 +483,7 @@ reset:
 do_hang:
        ldr     sp, _TEXT_BASE                  /* use 32 words abort stack */
        bl      hang                            /* hang and never return */
-#else  /* !CONFIG_PRELOADER */
+#else
        .align  5
 undefined_instruction:
        get_bad_stack
@@ -618,4 +602,4 @@ mmu_table:
        .word   (__base << 20) | 0xc12
        .set    __base, __base + 1
        .endr
-#endif
+#endif /* CONFIG_PRELOADER */