diff options
Diffstat (limited to 'arch/arm/boot/compressed/head.S')
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 79 |
1 files changed, 32 insertions, 47 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index cabdd8f4a248..c79db44ba128 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -287,28 +287,22 @@ not_angel: */ mov r0, pc cmp r0, r4 - ldrcc r0, LC0+28 + ldrcc r0, .Lheadroom addcc r0, r0, pc cmpcc r4, r0 orrcc r4, r4, #1 @ remember we skipped cache_on blcs cache_on -restart: adr r0, LC0 - ldmia r0, {r1, r2, r3, r6, r11, r12} - ldr sp, [r0, #24] - - /* - * We might be running at a different address. We need - * to fix up various pointers. - */ - sub r0, r0, r1 @ calculate the delta offset - add r6, r6, r0 @ _edata +restart: adr r0, LC1 + ldr sp, [r0] + ldr r6, [r0, #4] + add sp, sp, r0 + add r6, r6, r0 get_inflated_image_size r9, r10, lr #ifndef CONFIG_ZBOOT_ROM /* malloc space is above the relocated stack (64k max) */ - add sp, sp, r0 add r10, sp, #0x10000 #else /* @@ -322,9 +316,6 @@ restart: adr r0, LC0 mov r5, #0 @ init dtb size to 0 #ifdef CONFIG_ARM_APPENDED_DTB /* - * r0 = delta - * r2 = BSS start - * r3 = BSS end * r4 = final kernel address (possibly with LSB set) * r5 = appended dtb size (still unknown) * r6 = _edata @@ -332,8 +323,6 @@ restart: adr r0, LC0 * r8 = atags/device tree pointer * r9 = size of decompressed image * r10 = end of this image, including bss/stack/malloc space if non XIP - * r11 = GOT start - * r12 = GOT end * sp = stack pointer * * if there are device trees (dtb) appended to zImage, advance r10 so that the @@ -381,7 +370,6 @@ restart: adr r0, LC0 /* temporarily relocate the stack past the DTB work space */ add sp, sp, r5 - stmfd sp!, {r0-r3, ip, lr} mov r0, r8 mov r1, r6 mov r2, r5 @@ -400,7 +388,6 @@ restart: adr r0, LC0 mov r2, r5 bleq atags_to_fdt - ldmfd sp!, {r0-r3, ip, lr} sub sp, sp, r5 #endif @@ -537,6 +524,10 @@ dtb_check_done: mov pc, r0 wont_overwrite: + adr r0, LC0 + ldmia r0, {r1, r2, r3, r11, r12} + sub r0, r0, r1 @ calculate the delta offset + /* * If delta is zero, we are running at the address we were linked at. * r0 = delta @@ -660,13 +651,18 @@ not_relocated: mov r0, #0 LC0: .word LC0 @ r1 .word __bss_start @ r2 .word _end @ r3 - .word _edata @ r6 .word _got_start @ r11 .word _got_end @ ip - .word .L_user_stack_end @ sp - .word _end - restart + 16384 + 1024*1024 .size LC0, . - LC0 + .type LC1, #object +LC1: .word .L_user_stack_end - LC1 @ sp + .word _edata - LC1 @ r6 + .size LC1, . - LC1 + +.Lheadroom: + .word _end - restart + 16384 + 1024*1024 + .Linflated_image_size_offset: .long (input_data_end - 4) - . @@ -1434,37 +1430,26 @@ reloc_code_end: #ifdef CONFIG_EFI_STUB ENTRY(efi_enter_kernel) - mov r7, r0 @ preserve image base - mov r4, r1 @ preserve DT pointer + mov r4, r0 @ preserve image base + mov r8, r1 @ preserve DT pointer - mov r0, r4 @ DT start - add r1, r4, r2 @ DT end - bl cache_clean_flush + mrc p15, 0, r0, c1, c0, 0 @ read SCTLR + tst r0, #0x1 @ MMU enabled? + orreq r4, r4, #1 @ set LSB if not - mov r0, r7 @ relocated zImage - ldr r1, =_edata @ size of zImage - add r1, r1, r0 @ end of zImage + mov r0, r8 @ DT start + add r1, r8, r2 @ DT end bl cache_clean_flush - @ The PE/COFF loader might not have cleaned the code we are - @ running beyond the PoU, and so calling cache_off below from - @ inside the PE/COFF loader allocated region is unsafe unless - @ we explicitly clean it to the PoC. - adr r0, call_cache_fn @ region of code we will - adr r1, 0f @ run with MMU off - bl cache_clean_flush - bl cache_off + adr r0, 0f @ switch to our stack + ldr sp, [r0] + add sp, sp, r0 - @ Set parameters for booting zImage according to boot protocol - @ put FDT address in r2, it was returned by efi_entry() - @ r1 is the machine type, and r0 needs to be 0 - mov r0, #0 - mov r1, #0xFFFFFFFF - mov r2, r4 - add r7, r7, #(__efi_start - start) - mov pc, r7 @ no mode switch + mov r5, #0 @ appended DTB size + mov r7, #0xFFFFFFFF @ machine ID + b wont_overwrite ENDPROC(efi_enter_kernel) -0: +0: .long .L_user_stack_end - . #endif .align |