* Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
* Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
* Copyright (c) 2003 Kshitij <kshitij@ti.com>
+ * Copyright (c) 2010 Albert Aribaud <albert.aribaud@free.fr>
*
* See file CREDITS for list of people who contributed to this
* project.
* MA 02111-1307 USA
*/
-
+#include <asm-offsets.h>
#include <config.h>
#include <common.h>
#include <version.h>
*************************************************************************
*/
+.globl _TEXT_BASE
_TEXT_BASE:
- .word TEXT_BASE
-
-.globl _armboot_start
-_armboot_start:
- .word _start
+ .word CONFIG_SYS_TEXT_BASE
/*
* These are defined in the board-specific linker script.
+ * Subtracting _start from them lets the linker put their
+ * relative position in the executable instead of leaving
+ * them null.
*/
-.globl _bss_start
-_bss_start:
- .word __bss_start
+.globl _bss_start_ofs
+_bss_start_ofs:
+ .word __bss_start - _start
-.globl _bss_end
-_bss_end:
- .word _end
+.globl _bss_end_ofs
+_bss_end_ofs:
+ .word _end - _start
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
.word 0x0badc0de
#endif
+#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+ .word 0x0badc0de
+
+/*
+ * the actual reset code
+ */
+
+reset:
+ /*
+ * set the cpu to SVC32 mode
+ */
+ mrs r0,cpsr
+ bic r0,r0,#0x1f
+ orr r0,r0,#0xd3
+ msr cpsr,r0
+
+ /*
+ * we do sys-critical inits only at reboot,
+ * not when booting from ram!
+ */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+ 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)
+ ldr r0,=0x00000000
+ bl board_init_f
+
+/*------------------------------------------------------------------------------*/
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ */
+ .globl relocate_code
+relocate_code:
+ mov r4, r0 /* save addr_sp */
+ mov r5, r1 /* save addr of gd */
+ mov r6, r2 /* save addr of destination */
+ mov r7, r2 /* save addr of destination */
+
+ /* Set up the stack */
+stack_setup:
+ mov sp, r4
+
+ adr r0, _start
+ ldr r2, _TEXT_BASE
+ ldr r3, _bss_start_ofs
+ add r2, r0, r3 /* r2 <- source end address */
+ cmp r0, r6
+ beq clear_bss
+
+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
+copy_loop:
+ ldmia r0!, {r9-r10} /* copy from source address [r0] */
+ stmia r6!, {r9-r10} /* copy to target address [r1] */
+ cmp r0, r2 /* until source end address [r2] */
+ blo copy_loop
+
+#ifndef CONFIG_PRELOADER
+ /*
+ * fix .rel.dyn relocations
+ */
+ ldr r0, _TEXT_BASE /* r0 <- Text base */
+ sub r9, r7, r0 /* r9 <- relocation offset */
+ ldr r10, _dynsym_start_ofs /* r10 <- sym table ofs */
+ add r10, r10, r0 /* r10 <- sym table in FLASH */
+ ldr r2, _rel_dyn_start_ofs /* r2 <- rel dyn start ofs */
+ add r2, r2, r0 /* r2 <- rel dyn start in FLASH */
+ ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
+ add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
+fixloop:
+ ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
+ add r0, r0, r9 /* r0 <- location to fix up in RAM */
+ ldr r1, [r2, #4]
+ and r8, r1, #0xff
+ cmp r8, #23 /* relative fixup? */
+ beq fixrel
+ cmp r8, #2 /* absolute fixup? */
+ beq fixabs
+ /* ignore unknown type of fixup */
+ b fixnext
+fixabs:
+ /* absolute fix: set location to (offset) symbol value */
+ mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
+ add r1, r10, r1 /* r1 <- address of symbol in table */
+ ldr r1, [r1, #4] /* r1 <- symbol value */
+ add r1, r9 /* r1 <- relocated sym addr */
+ b fixnext
+fixrel:
+ /* relative fix: increase location by offset */
+ ldr r1, [r0]
+ add r1, r1, r9
+fixnext:
+ str r1, [r0]
+ add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
+ cmp r2, r3
+ blo fixloop
+#endif
+#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
+
+clear_bss:
+#ifndef CONFIG_PRELOADER
+ ldr r0, _bss_start_ofs
+ ldr r1, _bss_end_ofs
+ ldr r3, _TEXT_BASE /* Text base */
+ mov r4, r7 /* reloc addr */
+ add r0, r0, r4
+ add r1, r1, r4
+ mov r2, #0x00000000 /* clear */
+
+clbss_l:str r2, [r0] /* clear loop... */
+ add r0, r0, #4
+ cmp r0, r1
+ bne clbss_l
+
+ 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 r0, r0, r1
+ add lr, r0, r9
+ /* setup parameters for board_init_r */
+ mov r0, r5 /* gd_t */
+ mov r1, r7 /* 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:
+ .word __rel_dyn_end - _start
+_dynsym_start_ofs:
+ .word __dynsym_start - _start
+
+#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/*
* the actual reset code
*/
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq stack_setup
- ldr r2, _armboot_start
- ldr r3, _bss_start
- sub r2, r3, r2 /* r2 <- size of armboot */
- add r2, r0, r2 /* r2 <- source end address */
+ ldr r3, _bss_start_ofs /* r3 <- _bss_start - _start */
+ add r2, r0, r3 /* r2 <- source end address */
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
- cmp r0, r2 /* until source end addreee [r2] */
- ble copy_loop
+ cmp r0, r2 /* until source end address [r2] */
+ blo copy_loop
#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
/* Set up the stack */
sub sp, r0, #128 /* leave 32 words for abort-stack */
#ifndef CONFIG_PRELOADER
sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
- sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
+ sub r0, r0, #GENERATED_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
#endif /* CONFIG_PRELOADER */
sub sp, r0, #12 /* leave 3 words for abort-stack */
- bic sp, r0, #7 /* 8-byte align stack for ABI compliance */
+ bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
clear_bss:
- ldr r0, _bss_start /* find start of bss segment */
- ldr r1, _bss_end /* stop here */
+ adr r2, _start
+ ldr r0, _bss_start_ofs /* find start of bss segment */
+ add r0, r0, r2
+ ldr r1, _bss_end_ofs /* stop here */
+ add r1, r1, r2
mov r2, #0x00000000 /* clear */
#ifndef CONFIG_PRELOADER
clbss_l:str r2, [r0] /* clear loop... */
add r0, r0, #4
cmp r0, r1
- ble clbss_l
+ blo clbss_l
bl coloured_LED_init
bl red_LED_on
#endif /* CONFIG_PRELOADER */
- ldr pc, _start_armboot
+ ldr r0, _start_armboot_ofs
+ adr r1, _start
+ add r0, r0, r1
+ ldr pc, r0
-_start_armboot:
+_start_armboot_ofs:
#ifdef CONFIG_NAND_SPL
- .word nand_boot
+ .word nand_boot - _start
#else
- .word start_armboot
+ .word start_armboot - _start
#endif /* CONFIG_NAND_SPL */
-
+#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/*
*************************************************************************
@ carve out a frame on current user stack
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
-
- ldr r2, _armboot_start
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
+ adr r2, _start
sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
- sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
+ sub r2, r2, #(GENERATED_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
+#else
+ ldr r2, IRQ_STACK_START_IN
+#endif
@ get values for "aborted" pc and cpsr (into parm regs)
ldmia r2, {r2 - r3}
add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
.endm
.macro get_bad_stack
- ldr r13, _armboot_start @ setup our mode stack
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
+ adr r13, _start @ setup our mode stack
sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
- sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
+ sub r13, r13, #(GENERATED_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
+#else
+ ldr r13, IRQ_STACK_START_IN @ setup our mode stack
+#endif
str lr, [r13] @ save caller lr in position 0 of saved stack
mrs lr, spsr @ get the spsr
projects / u-boot / blobdiff