From e05e5de7fae5bec79617e113916dac6631251156 Mon Sep 17 00:00:00 2001 From: Albert ARIBAUD Date: Tue, 8 Jan 2013 10:18:02 +0000 Subject: arm: move C runtime setup code in crt0.S Move all the C runtime setup code from every start.S in arch/arm into arch/arm/lib/crt0.S. This covers the code sequence from setting up the initial stack to calling into board_init_r(). Also, rewrite the C runtime setup and make functions board_init_*() and relocate_code() behave according to normal C semantics (no jumping across the C stack any more, etc). Some SPL targets had to be touched because they use start.S explicitly or for some reason; the relevant maintainers and custodians are cc:ed. Signed-off-by: Albert ARIBAUD --- arch/arm/cpu/arm926ejs/start.S | 80 ++++++------------------------------------ 1 file changed, 11 insertions(+), 69 deletions(-) (limited to 'arch/arm/cpu/arm926ejs/start.S') diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S index 2188f7e35d..3cdecd9cdd 100644 --- a/arch/arm/cpu/arm926ejs/start.S +++ b/arch/arm/cpu/arm926ejs/start.S @@ -198,20 +198,7 @@ reset: bl cpu_init_crit #endif -/* Set stackpointer in internal RAM to call board_init_f */ -call_board_init_f: -#ifdef CONFIG_NAND_SPL /* deprecated, use instead CONFIG_SPL_BUILD */ - ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) -#else -#ifdef CONFIG_SPL_BUILD - ldr sp, =(CONFIG_SPL_STACK) -#else - ldr sp, =(CONFIG_SYS_INIT_SP_ADDR) -#endif -#endif - bic sp, sp, #7 /* 8-byte alignment for ABI compliance */ - ldr r0,=0x00000000 - bl board_init_f + bl _main /*------------------------------------------------------------------------------*/ @@ -229,15 +216,11 @@ relocate_code: mov r5, r1 /* save addr of gd */ mov r6, r2 /* save addr of destination */ - /* Set up the stack */ -stack_setup: - mov sp, r4 - adr r0, _start sub r9, r6, r0 /* r9 <- relocation offset */ cmp r0, r6 - moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */ - beq clear_bss /* skip relocation */ + moveq r9, #0 /* no relocation. offset(r9) = 0 */ + beq relocate_done /* skip relocation */ mov r1, r6 /* r1 <- scratch for copy loop */ ldr r3, _bss_start_ofs add r2, r0, r3 /* r2 <- source end address */ @@ -289,56 +272,9 @@ fixnext: blo fixloop #endif -clear_bss: -#ifdef CONFIG_SPL_BUILD - /* No relocation for SPL */ - ldr r0, =__bss_start - ldr r1, =__bss_end__ -#else - ldr r0, _bss_start_ofs - ldr r1, _bss_end_ofs - mov r4, r6 /* reloc addr */ - add r0, r0, r4 - add r1, r1, r4 -#endif - mov r2, #0x00000000 /* clear */ - -clbss_l:cmp r0, r1 /* clear loop... */ - bhs clbss_e /* if reached end of bss, exit */ - str r2, [r0] - add r0, r0, #4 - b clbss_l -clbss_e: +relocate_done: -#ifndef CONFIG_SPL_BUILD - bl coloured_LED_init - bl red_led_on -#endif - -/* - * We are done. Do not return, instead branch to second part of board - * initialization, now running from RAM. - */ -#ifdef CONFIG_NAND_SPL - ldr r0, _nand_boot_ofs - mov pc, r0 - -_nand_boot_ofs: - .word nand_boot -#else - ldr r0, _board_init_r_ofs - ldr r1, _TEXT_BASE - add lr, r0, r1 - add lr, lr, r9 - /* setup parameters for board_init_r */ - mov r0, r5 /* gd_t */ - mov r1, r6 /* dest_addr */ - /* jump to it ... */ - mov pc, lr - -_board_init_r_ofs: - .word board_init_r - _start -#endif + bx lr _rel_dyn_start_ofs: .word __rel_dyn_start - _start @@ -346,8 +282,14 @@ _rel_dyn_end_ofs: .word __rel_dyn_end - _start _dynsym_start_ofs: .word __dynsym_start - _start + #endif + .globl c_runtime_cpu_setup +c_runtime_cpu_setup: + + bx lr + /* ************************************************************************* * -- cgit v1.2.1