diff options
Diffstat (limited to 'cpu/arm925t/start.S')
| -rw-r--r-- | cpu/arm925t/start.S | 42 |
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 |