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 <albert.u.boot@aribaud.net>
diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S
index 5d3b4c2..a067b8a 100644
--- a/arch/arm/cpu/arm1136/start.S
+++ b/arch/arm/cpu/arm1136/start.S
@@ -165,13 +165,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
-
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -188,14 +182,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ beq relocate_done /* skip relocation */
mov r1, r6 /* r1 <- scratch for copy_loop */
ldr r3, _image_copy_end_ofs
add r2, r0, r3 /* r2 <- source end address */
@@ -245,7 +235,15 @@
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
cmp r2, r3
blo fixloop
- b clear_bss
+ bx lr
+
+#endif
+
+relocate_done:
+
+ bx lr
+
+#ifndef CONFIG_SPL_BUILD
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
@@ -253,54 +251,13 @@
.word __rel_dyn_end - _start
_dynsym_start_ofs:
.word __dynsym_start - _start
+
#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 */
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
-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:
-
-/*
- * 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
-jump_2_ram:
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
/*
*************************************************************************
diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S
index 667a0e0..40df4b1 100644
--- a/arch/arm/cpu/arm1176/start.S
+++ b/arch/arm/cpu/arm1176/start.S
@@ -224,12 +224,7 @@
*/
bl lowlevel_init /* go setup pll,mux,memory */
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -246,14 +241,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -343,49 +334,9 @@
skip_hw_init:
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-#ifndef CONFIG_NAND_SPL
- bl coloured_LED_init
- bl red_led_on
-#endif
-#endif
-
-/*
- * We are done. Do not return, instead branch to second part of board
- * initialization, now running from RAM.
- */
-#ifdef CONFIG_NAND_SPL
- ldr pc, _nand_boot
-
-_nand_boot: .word nand_boot
-#else
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
@@ -399,6 +350,11 @@
.word mmu_table
#endif
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
#ifndef CONFIG_NAND_SPL
/*
* we assume that cache operation is done before. (eg. cleanup_before_linux())
diff --git a/arch/arm/cpu/arm720t/start.S b/arch/arm/cpu/arm720t/start.S
index c2a7763..771d386 100644
--- a/arch/arm/cpu/arm720t/start.S
+++ b/arch/arm/cpu/arm720t/start.S
@@ -147,12 +147,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -169,14 +164,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -228,43 +219,10 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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.
- */
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
-
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
@@ -272,6 +230,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/arm920t/start.S b/arch/arm/cpu/arm920t/start.S
index 14c9156..511d21d 100644
--- a/arch/arm/cpu/arm920t/start.S
+++ b/arch/arm/cpu/arm920t/start.S
@@ -182,12 +182,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -204,14 +199,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -263,51 +254,10 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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
- adr r1, _start
- 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
-
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
@@ -315,6 +265,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/arm925t/start.S b/arch/arm/cpu/arm925t/start.S
index 3a483f6..82f5b8b 100644
--- a/arch/arm/cpu/arm925t/start.S
+++ b/arch/arm/cpu/arm925t/start.S
@@ -176,12 +176,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -198,14 +193,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -257,51 +248,10 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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
- adr r1, _start
- 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
-
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
@@ -309,6 +259,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
index 2188f7e..3cdecd9 100644
--- a/arch/arm/cpu/arm926ejs/start.S
+++ b/arch/arm/cpu/arm926ejs/start.S
@@ -198,20 +198,7 @@
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 @@
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 @@
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 */
+relocate_done:
-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:
-
-#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 @@
.word __rel_dyn_end - _start
_dynsym_start_ofs:
.word __dynsym_start - _start
+
#endif
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ bx lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/arm946es/start.S b/arch/arm/cpu/arm946es/start.S
index 30e2183..a7a98a4 100644
--- a/arch/arm/cpu/arm946es/start.S
+++ b/arch/arm/cpu/arm946es/start.S
@@ -147,12 +147,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -169,14 +164,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -228,46 +219,10 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-#endif
-
-/*
- * We are done. Do not return, instead branch to second part of board
- * initialization, now running from RAM.
- */
-#ifdef CONFIG_NAND_SPL
- ldr pc, _nand_boot
-
-_nand_boot: .word nand_boot
-#else
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
-
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
@@ -275,6 +230,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/arm_intcm/start.S b/arch/arm/cpu/arm_intcm/start.S
index a133d19..c189849 100644
--- a/arch/arm/cpu/arm_intcm/start.S
+++ b/arch/arm/cpu/arm_intcm/start.S
@@ -143,12 +143,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -165,14 +160,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -224,50 +215,9 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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
- adr r1, _start
- 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
@@ -276,6 +226,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 7df97c5..dcc1f83 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -155,12 +155,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -177,14 +172,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ beq relocate_done /* skip relocation */
mov r1, r6 /* r1 <- scratch for copy_loop */
ldr r3, _image_copy_end_ofs
add r2, r0, r3 /* r2 <- source end address */
@@ -233,34 +224,22 @@
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
cmp r2, r3
blo fixloop
- b clear_bss
+
+relocate_done:
+
+ bx lr
+
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
.word __rel_dyn_end - _start
_dynsym_start_ofs:
.word __dynsym_start - _start
+ENDPROC(relocate_code)
-clear_bss:
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+#endif
-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:
-
-/*
- * We are done. Do not return, instead branch to second part of board
- * initialization, now running from RAM.
- */
-jump_2_ram:
+ENTRY(c_runtime_cpu_setup)
/*
* If I-cache is enabled invalidate it
*/
@@ -279,20 +258,9 @@
mcr p15, 0, r0, c12, c0, 0 @Set VBAR
#endif /* !Tegra20 */
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
+ bx lr
-_board_init_r_ofs:
- .word board_init_r - _start
-ENDPROC(relocate_code)
-#endif
+ENDPROC(c_runtime_cpu_setup)
/*************************************************************************
*
diff --git a/arch/arm/cpu/ixp/start.S b/arch/arm/cpu/ixp/start.S
index c12f1a7..efb5a40 100644
--- a/arch/arm/cpu/ixp/start.S
+++ b/arch/arm/cpu/ixp/start.S
@@ -245,12 +245,7 @@
orr r0,r0,#0x13
msr cpsr,r0
-/* Set initial stackpointer in SDRAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -267,14 +262,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -326,42 +317,9 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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.
- */
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
+ bx lr
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
@@ -370,6 +328,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ bx lr
+
/****************************************************************************/
/* */
/* Interrupt handling */
diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S
index 536cf5c..72af869 100644
--- a/arch/arm/cpu/pxa/start.S
+++ b/arch/arm/cpu/pxa/start.S
@@ -164,12 +164,7 @@
bl lock_cache_for_stack
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0, =0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
#ifndef CONFIG_SPL_BUILD
@@ -186,10 +181,6 @@
mov r5, r1 /* save addr of gd */
mov r6, r2 /* save addr of destination */
- /* Set up the stack */
-stack_setup:
- mov sp, r4
-
/* Disable the Dcache RAM lock for stack now */
#ifdef CONFIG_CPU_PXA25X
bl cpu_init_crit
@@ -198,7 +189,7 @@
adr r0, _start
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -250,48 +241,9 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-#endif /* #ifndef CONFIG_SPL_BUILD */
-
-/*
- * We are done. Do not return, instead branch to second part of board
- * initialization, now running from RAM.
- */
-#ifdef CONFIG_ONENAND_SPL
- ldr r0, _onenand_boot_ofs
- mov pc, r0
-
-_onenand_boot_ofs:
- .word onenand_boot
-#else
-jump_2_ram:
- 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
@@ -299,7 +251,14 @@
.word __rel_dyn_end - _start
_dynsym_start_ofs:
.word __dynsym_start - _start
+
#endif
+
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ bx lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/s3c44b0/start.S b/arch/arm/cpu/s3c44b0/start.S
index 323b923..4528c91 100644
--- a/arch/arm/cpu/s3c44b0/start.S
+++ b/arch/arm/cpu/s3c44b0/start.S
@@ -128,12 +128,7 @@
bl lowlevel_init
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -150,14 +145,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -209,42 +200,9 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-
- 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.
- */
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
+ bx lr
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
@@ -253,6 +211,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ bx lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/cpu/sa1100/start.S b/arch/arm/cpu/sa1100/start.S
index 1ea92d1..3144299 100644
--- a/arch/arm/cpu/sa1100/start.S
+++ b/arch/arm/cpu/sa1100/start.S
@@ -132,12 +132,7 @@
bl cpu_init_crit
#endif
-/* Set stackpointer in internal RAM to call board_init_f */
-call_board_init_f:
- ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
- bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
- ldr r0,=0x00000000
- bl board_init_f
+ bl _main
/*------------------------------------------------------------------------------*/
@@ -154,14 +149,10 @@
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
cmp r0, r6
moveq r9, #0 /* no relocation. relocation offset(r9) = 0 */
- beq clear_bss /* skip relocation */
+ 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 */
@@ -213,40 +204,10 @@
blo fixloop
#endif
-clear_bss:
-#ifndef CONFIG_SPL_BUILD
- ldr r0, _bss_start_ofs
- ldr r1, _bss_end_ofs
- mov r4, r6 /* reloc addr */
- add r0, r0, r4
- add r1, r1, r4
- mov r2, #0x00000000 /* clear */
+relocate_done:
-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:
-#endif
-
-/*
- * We are done. Do not return, instead branch to second part of board
- * initialization, now running from RAM.
- */
- ldr r0, _board_init_r_ofs
- adr r1, _start
- 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
-
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
_rel_dyn_end_ofs:
@@ -254,6 +215,11 @@
_dynsym_start_ofs:
.word __dynsym_start - _start
+ .globl c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+ mov pc, lr
+
/*
*************************************************************************
*
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 3422ac1..07baee2 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -36,6 +36,8 @@
GLCOBJS += div0.o
+SOBJS-y += crt0.o
+
ifndef CONFIG_SPL_BUILD
COBJS-y += board.o
COBJS-y += bootm.o
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index e0cb635..0459d0c 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -279,11 +279,6 @@
bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_F, "board_init_f");
- /* Pointer is writable since we allocated a register for it */
- gd = (gd_t *) ((CONFIG_SYS_INIT_SP_ADDR) & ~0x07);
- /* compiler optimization barrier needed for GCC >= 3.4 */
- __asm__ __volatile__("": : :"memory");
-
memset((void *)gd, 0, sizeof(gd_t));
gd->mon_len = _bss_end_ofs;
@@ -465,10 +460,6 @@
gd->fdt_blob = new_fdt;
}
memcpy(id, (void *)gd, sizeof(gd_t));
-
- relocate_code(addr_sp, id, addr);
-
- /* NOTREACHED - relocate_code() does not return */
}
#if !defined(CONFIG_SYS_NO_FLASH)
@@ -493,8 +484,6 @@
ulong flash_size;
#endif
- gd = id;
-
gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */
bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_R, "board_init_r");
diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
new file mode 100644
index 0000000..4f60958
--- /dev/null
+++ b/arch/arm/lib/crt0.S
@@ -0,0 +1,173 @@
+/*
+ * crt0 - C-runtime startup Code for ARM U-Boot
+ *
+ * Copyright (c) 2012 Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <asm-offsets.h>
+
+/*
+ * This file handles the target-independent stages of the U-Boot
+ * start-up where a C runtime environment is needed. Its entry point
+ * is _main and is branched into from the target's start.S file.
+ *
+ * _main execution sequence is:
+ *
+ * 1. Set up initial environment for calling board_init_f().
+ * This environment only provides a stack and a place to store
+ * the GD ('global data') structure, both located in some readily
+ * available RAM (SRAM, locked cache...). In this context, VARIABLE
+ * global data, initialized or not (BSS), are UNAVAILABLE; only
+ * CONSTANT initialized data are available.
+ *
+ * 2. Call board_init_f(). This function prepares the hardware for
+ * execution from system RAM (DRAM, DDR...) As system RAM may not
+ * be available yet, , board_init_f() must use the current GD to
+ * store any data which must be passed on to later stages. These
+ * data include the relocation destination, the future stack, and
+ * the future GD location.
+ *
+ * (the following applies only to non-SPL builds)
+ *
+ * 3. Set up intermediate environment where the stack and GD are the
+ * ones allocated by board_init_f() in system RAM, but BSS and
+ * initialized non-const data are still not available.
+ *
+ * 4. Call relocate_code(). This function relocates U-Boot from its
+ * current location into the relocation destination computed by
+ * board_init_f().
+ *
+ * 5. Set up final environment for calling board_init_r(). This
+ * environment has BSS (initialized to 0), initialized non-const
+ * data (initialized to their intended value), and stack in system
+ * RAM. GD has retained values set by board_init_f(). Some CPUs
+ * have some work left to do at this point regarding memory, so
+ * call c_runtime_cpu_setup.
+ *
+ * 6. Branch to either nand_boot() or board_init_r().
+ */
+
+/*
+ * declare nand_boot() or board_init_r() to jump to at end of crt0
+ */
+
+#if defined(CONFIG_NAND_SPL)
+
+.globl nand_boot
+
+#elif ! defined(CONFIG_SPL_BUILD)
+
+.globl board_init_r
+
+#endif
+
+/*
+ * start and end of BSS
+ */
+
+.globl __bss_start
+.globl __bss_end__
+
+/*
+ * entry point of crt0 sequence
+ */
+
+.global _main
+
+_main:
+
+/*
+ * Set up initial C runtime environment and call board_init_f(0).
+ */
+
+#if defined(CONFIG_NAND_SPL)
+ /* deprecated, use instead CONFIG_SPL_BUILD */
+ ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
+#elif defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
+ ldr sp, =(CONFIG_SPL_STACK)
+#else
+ ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
+#endif
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ sub sp, #GD_SIZE /* allocate one GD above SP */
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ mov r8, sp /* GD is above SP */
+ mov r0, #0
+ bl board_init_f
+
+#if ! defined(CONFIG_SPL_BUILD)
+
+/*
+ * Set up intermediate environment (new sp and gd) and call
+ * relocate_code(addr_sp, gd, addr_moni). Trick here is that
+ * we'll return 'here' but relocated.
+ */
+
+ ldr sp, [r8, #GD_START_ADDR_SP] /* r8 = gd->start_addr_sp */
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
+ ldr r8, [r8, #GD_BD] /* r8 = gd->bd */
+ sub r8, r8, #GD_SIZE /* new GD is below bd */
+
+ adr lr, here
+ ldr r0, [r8, #GD_RELOC_OFF] /* lr = gd->start_addr_sp */
+ add lr, lr, r0
+ ldr r0, [r8, #GD_START_ADDR_SP] /* r0 = gd->start_addr_sp */
+ mov r1, r8 /* r1 = gd */
+ ldr r2, [r8, #GD_RELOCADDR] /* r2 = gd->relocaddr */
+ b relocate_code
+here:
+
+/* Set up final (full) environment */
+
+ bl c_runtime_cpu_setup /* we still call old routine here */
+
+ ldr r0, =__bss_start /* this is auto-relocated! */
+ ldr r1, =__bss_end__ /* this is auto-relocated! */
+
+ mov r2, #0x00000000 /* prepare zero to clear BSS */
+
+clbss_l:cmp r0, r1 /* while not at end of BSS */
+ strlo r2, [r0] /* clear 32-bit BSS word */
+ addlo r0, r0, #4 /* move to next */
+ blo clbss_l
+
+ bl coloured_LED_init
+ bl red_led_on
+
+#if defined(CONFIG_NAND_SPL)
+
+ /* call _nand_boot() */
+ ldr pc, =nand_boot
+
+#else
+
+ /* call board_init_r(gd_t *id, ulong dest_addr) */
+ mov r0, r8 /* gd_t */
+ ldr r1, [r8, #GD_RELOCADDR] /* dest_addr */
+ /* call board_init_r */
+ ldr pc, =board_init_r /* this is auto-relocated! */
+
+#endif
+
+ /* we should not return here. */
+
+#endif