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-rw-r--r--cpu/arm925t/start.S42
1 files changed, 26 insertions, 16 deletions
diff --git a/cpu/arm925t/start.S b/cpu/arm925t/start.S
index 0a3042d..da84de1 100644
--- a/cpu/arm925t/start.S
+++ b/cpu/arm925t/start.S
@@ -89,16 +89,15 @@ _armboot_start:
.word _start
/*
- * Note: _armboot_end_data and _armboot_end are defined
- * by the (board-dependent) linker script.
- * _armboot_end_data is the first usable FLASH address after armboot
+ * These are defined in the board-specific linker script.
*/
-.globl _armboot_end_data
-_armboot_end_data:
- .word armboot_end_data
-.globl _armboot_end
-_armboot_end:
- .word armboot_end
+.globl _bss_start
+_bss_start:
+ .word __bss_start
+
+.globl _bss_end
+_bss_end:
+ .word _end
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
@@ -176,7 +175,7 @@ relocate: /* relocate U-Boot to RAM */
beq stack_setup
ldr r2, _armboot_start
- ldr r3, _armboot_end
+ ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
add r2, r0, r2 /* r2 <- source end address */
@@ -196,6 +195,17 @@ stack_setup:
#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
+clear_bss:
+ ldr r0, _bss_start /* find start of bss segment */
+ add r0, r0, #4 /* start at first byte of bss */
+ ldr r1, _bss_end /* stop here */
+ mov r2, #0x00000000 /* clear */
+
+clbss_l:str r2, [r0] /* clear loop... */
+ add r0, r0, #4
+ cmp r0, r1
+ bne clbss_l
+
ldr pc, _start_armboot
_start_armboot: .word start_armboot
@@ -283,9 +293,9 @@ cpu_init_crit:
sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
- ldr r2, _armboot_end @ find top of stack
- add r2, r2, #CONFIG_STACKSIZE @ find base of normal stack
- sub r2, r2, #8 @ set base 2 words into abort stack
+ ldr r2, _armboot_start
+ sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
@@ -316,9 +326,9 @@ cpu_init_crit:
.endm
.macro get_bad_stack
- ldr r13, _armboot_end @ get bottom of stack (into sp by by user stack pointer).
- add r13, r13, #CONFIG_STACKSIZE @ head to reserved words at the top of the stack
- sub r13, r13, #8 @ reserved a couple spots in abort stack
+ ldr r13, _armboot_start @ setup our mode stack
+ sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
str lr, [r13] @ save caller lr in position 0 of saved stack
mrs lr, spsr @ get the spsr