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* grub-core/kern/arm/uboot/startup.S: Remove = by replacing with

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literal load.
	(grub_uboot_syscall): Save/restore r9 and align stack.
This commit is contained in:
Vladimir Serbinenko 2013-11-13 06:27:03 +01:00
parent 8149861554
commit c9cd02c965
2 changed files with 50 additions and 25 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2013-11-13 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/arm/uboot/startup.S: Remove = by replacing with
literal load.
(grub_uboot_syscall): Save/restore r9 and align stack.
2013-11-13 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/arm/cache.S: Replace = with explicit litteral load.

67
grub-core/kern/arm/uboot/startup.S
View file

@ -55,27 +55,36 @@ FUNCTION(_start)
VARIABLE(grub_total_module_size)
.long 0
VARIABLE(grub_uboot_machine_type)
.long 0
VARIABLE(grub_uboot_boot_data)
.long 0
VARIABLE(grub_modbase)
.long 0
bss_start_ptr:
.long EXT_C(__bss_start)
end_ptr:
.long EXT_C(_end)
FUNCTION(codestart)
@ Store context: Machine ID, atags/dtb, ...
@ U-Boot API signature is stored on the U-Boot heap
@ Stack pointer used as start address for signature probing
mov r12, sp
ldr sp, =entry_state
adr sp, entry_state
push {r4-r12,lr} @ store U-Boot context (sp in r12)
ldr r12, =EXT_C(grub_uboot_machine_type)
str r1, [r12]
ldr r12, =EXT_C(grub_uboot_boot_data)
str r2, [r12]
str r1, EXT_C(grub_uboot_machine_type)
str r2, EXT_C(grub_uboot_boot_data)
@ Modules have been stored as a blob in BSS,
@ they need to be manually relocated to _end
ldr r0, =EXT_C(__bss_start) @ src
ldr r0, bss_start_ptr @ src
add r0, r0, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
mvn r1, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
and r0, r0, r1
ldr r1, =EXT_C(_end) @ dst = End of BSS
ldr r1, end_ptr @ dst = End of BSS
ldr r2, grub_total_module_size @ blob size
add r1, r1, #GRUB_KERNEL_MACHINE_STACK_SIZE
@ -83,8 +92,7 @@ FUNCTION(codestart)
sub sp, r1, #8
add r1, r1, #1024
ldr r12, =EXT_C(grub_modbase)
str r1, [r12]
str r1, EXT_C(grub_modbase)
add r1, r1, r2
add r0, r0, r2
@ -98,14 +106,14 @@ FUNCTION(codestart)
@ Since we _are_ the C run-time, we need to manually zero the BSS
@ region before continuing
ldr r0, =EXT_C(__bss_start) @ zero from here
ldr r0, bss_start_ptr @ zero from here
@ If unaligned, bytewise zero until base address aligned.
mov r2, #0
1: tst r0, #3
beq 2f
strb r2, [r0], #1
b 1b
2: ldr r1, =EXT_C(_end) @ to here
2: ldr r1, end_ptr @ to here
1: str r2, [r0], #4
cmp r0, r1
bne 1b
@ -120,28 +128,37 @@ FUNCTION(codestart)
* U-Boot (Global Data Pointer) and preserve it for Grub.
*/
FUNCTION(grub_uboot_syscall)
ldr ip, =transition_space
stm ip, {r8, lr}
ldr ip, =gd_backup
ldr r8, [ip]
ldr ip, =grub_uboot_syscall_ptr
str r8, transition_space
str lr, transition_space + 4
str r9, transition_space + 8
str sp, transition_space + 12
sub sp, sp, #0x20
lsr sp, sp, #3
lsl sp, sp, #3
ldr r8, gd_backup
ldr r9, gd_backup + 4
mov lr, pc
ldr pc, [ip]
ldr ip, =gd_backup
str r8, [ip]
ldr ip, =transition_space
ldm ip, {r8, lr}
ldr pc, grub_uboot_syscall_ptr
str r8, gd_backup
ldr r8, transition_space
ldr lr, transition_space + 4
ldr r9, transition_space + 8
ldr sp, transition_space + 12
bx lr
FUNCTION(grub_uboot_return)
ldr sp, =entry_state_end
adr sp, entry_state_end
pop {r4-r12, lr}
mov sp, r12
bx lr
.data
.align 3 @ 8-byte alignment for stack
.align 3
@ U-boot context stack space
entry_state_end:
.long 0 @ r4
@ -162,6 +179,8 @@ entry_state: @ backup for U-Boot context
transition_space:
.long 0 @ r8
.long 0 @ lr
.long 0 @ r9
.long 0 @ sp
VARIABLE(grub_uboot_syscall_ptr)
.long 0 @