summaryrefslogtreecommitdiff
path: root/arch/microblaze/cpu
diff options
context:
space:
mode:
authorMichal Simek <michal.simek@xilinx.com>2014-05-08 16:08:44 +0200
committerMichal Simek <michal.simek@xilinx.com>2015-02-09 15:11:56 +0100
commite945f6dc2814f5f0d30b5b7e23821b3fd4faff5b (patch)
tree30e842dc2c1878f34f9f86a5cc264e3b9a0bbdaf /arch/microblaze/cpu
parent4dd097427aeb6848fcb19c31b805abe1a3906913 (diff)
downloadu-boot-imx-e945f6dc2814f5f0d30b5b7e23821b3fd4faff5b.zip
u-boot-imx-e945f6dc2814f5f0d30b5b7e23821b3fd4faff5b.tar.gz
u-boot-imx-e945f6dc2814f5f0d30b5b7e23821b3fd4faff5b.tar.bz2
microblaze: Move architecture to use generic board init
Compile code with -fPIC to get GOT. Do not build SPL with fPIC because it increasing SPL size for nothing. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/cpu')
-rw-r--r--arch/microblaze/cpu/start.S103
-rw-r--r--arch/microblaze/cpu/u-boot.lds9
2 files changed, 112 insertions, 0 deletions
diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index 14c2f12..3de0e12 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -150,6 +150,7 @@ clear_bss:
bnei r6, 2b
3: /* jumping to board_init */
#ifndef CONFIG_SPL_BUILD
+ or r5, r0, r0 /* flags - empty */
brai board_init_f
#else
addi r31, r0, CONFIG_SYS_SPL_MALLOC_END
@@ -190,4 +191,106 @@ out16: bslli r3, r6, 8
rtsd r15, 8
or r0, r0, r0
.end out16
+
+/*
+ * Relocate u-boot
+ */
+ .text
+ .global relocate_code
+ .ent relocate_code
+ .align 2
+relocate_code:
+ /*
+ * r5 - start_addr_sp
+ * r6 - new_gd
+ * r7 - reloc_addr
+ */
+ addi r1, r5, 0 /* Start to use new SP */
+ addi r31, r6, 0 /* Start to use new GD */
+
+ add r23, r0, r7 /* Move reloc addr to r23 */
+ /* Relocate text and data - r12 temp value */
+ addi r21, r0, _start
+ addi r22, r0, __end - 4 /* Include BSS too */
+1: lwi r12, r21, 0 /* Load u-boot data */
+ swi r12, r23, 0 /* Write zero to loc */
+ addi r21, r21, 4 /* Increment to next loc - origin code */
+ cmp r12, r21, r22 /* Check if we have reach the end */
+ bneid r12, 1b
+ addi r23, r23, 4 /* Increment to next loc - relocate code */
+
+ /* R23 points to the base address. */
+ add r23, r0, r7 /* Move reloc addr to r23 */
+ addi r24, r0, CONFIG_SYS_TEXT_BASE /* Get reloc offset */
+ rsub r23, r24, r23 /* keep - this is already here gd->reloc_off */
+
+ addik r6, r0, 0x2 /* BIG/LITTLE endian offset */
+ lwi r7, r0, 0x28
+ swi r6, r0, 0x28 /* used first unused MB vector */
+ lbui r10, r0, 0x28 /* used first unused MB vector */
+ swi r7, r0, 0x28
+
+#ifdef CONFIG_SYS_USR_EXCEP
+ addik r6, r0, _exception_handler
+ addk r6, r6, r23 /* add offset */
+ sw r6, r1, r0
+ lhu r7, r1, r10
+ rsubi r8, r10, 0xa
+ sh r7, r0, r8
+ rsubi r8, r10, 0xe
+ sh r6, r0, r8
+#endif
+ addik r6, r0, _hw_exception_handler
+ addk r6, r6, r23 /* add offset */
+ sw r6, r1, r0
+ lhu r7, r1, r10
+ rsubi r8, r10, 0x22
+ sh r7, r0, r8
+ rsubi r8, r10, 0x26
+ sh r6, r0, r8
+
+ addik r6, r0, _interrupt_handler
+ addk r6, r6, r23 /* add offset */
+ sw r6, r1, r0
+ lhu r7, r1, r10
+ rsubi r8, r10, 0x12
+ sh r7, r0, r8
+ rsubi r8, r10, 0x16
+ sh r6, r0, r8
+
+ /* Check if GOT exist */
+ addik r21, r23, _got_start
+ addik r22, r23, _got_end
+ cmpu r12, r21, r22
+ beqi r12, 2f /* No GOT table - jump over */
+
+ /* Skip last 3 entries plus 1 because of loop boundary below */
+ addik r22, r22, -0x10
+
+ /* Relocate the GOT. */
+3: lw r12, r21, r0 /* Load entry */
+ addk r12, r12, r23 /* Add reloc offset */
+ sw r12, r21, r0 /* Save entry back */
+
+ cmpu r12, r21, r22 /* Check if this cross boundary */
+ bneid r12, 3b
+ addik r21. r21, 4
+
+ /* Update pointer to GOT */
+ mfs r20, rpc
+ addik r20, r20, _GLOBAL_OFFSET_TABLE_ + 8
+ addk r20, r20, r23
+
+ /* Flush caches to ensure consistency */
+ addik r5, r0, 0
+ addik r6, r0, XILINX_DCACHE_BYTE_SIZE
+ bralid r15, flush_cache
+ nop
+
+2: addi r5, r31, 0 /* gd is initialized in board_r.c */
+ addi r6, r0, CONFIG_SYS_TEXT_BASE
+ addi r12, r23, board_init_r
+ bra r12 /* Jump to relocated code */
+
+ .end relocate_code
#endif
diff --git a/arch/microblaze/cpu/u-boot.lds b/arch/microblaze/cpu/u-boot.lds
index 44bc036..2502a0d 100644
--- a/arch/microblaze/cpu/u-boot.lds
+++ b/arch/microblaze/cpu/u-boot.lds
@@ -33,10 +33,19 @@ SECTIONS
__data_end = .;
}
+ .got ALIGN(4):
+ {
+ _got_start = .;
+ *(.got*)
+ . = ALIGN(4);
+ _got_end = .;
+ }
+
. = ALIGN(4);
.u_boot_list : {
KEEP(*(SORT(.u_boot_list*)));
}
+ __init_end = . ;
.bss ALIGN(0x4):
{