diff options
Diffstat (limited to 'arch/arm/cpu/arm926ejs/start.S')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/start.S | 162 |
1 files changed, 83 insertions, 79 deletions
diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S index 8cbe3e7466..863de3ba0f 100644 --- a/arch/arm/cpu/arm926ejs/start.S +++ b/arch/arm/cpu/arm926ejs/start.S @@ -10,6 +10,7 @@ * 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. @@ -118,22 +119,19 @@ _fiq: _TEXT_BASE: .word CONFIG_SYS_TEXT_BASE -#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) -.globl _armboot_start -_armboot_start: - .word _start -#endif - /* * 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) */ @@ -153,30 +151,6 @@ FIQ_STACK_START: IRQ_STACK_START_IN: .word 0x0badc0de -.globl _datarel_start -_datarel_start: - .word __datarel_start - -.globl _datarelrolocal_start -_datarelrolocal_start: - .word __datarelrolocal_start - -.globl _datarellocal_start -_datarellocal_start: - .word __datarellocal_start - -.globl _datarelro_start -_datarelro_start: - .word __datarelro_start - -.globl _got_start -_got_start: - .word __got_start - -.globl _got_end -_got_end: - .word __got_end - /* * the actual reset code */ @@ -226,9 +200,8 @@ stack_setup: adr r0, _start ldr r2, _TEXT_BASE - 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 + add r2, r0, r3 /* r2 <- source end address */ cmp r0, r6 beq clear_bss @@ -240,36 +213,54 @@ copy_loop: blo copy_loop #ifndef CONFIG_PRELOADER - /* fix got entries */ - ldr r1, _TEXT_BASE /* Text base */ - mov r0, r7 /* reloc addr */ - ldr r2, _got_start /* addr in Flash */ - ldr r3, _got_end /* addr in Flash */ - sub r3, r3, r1 - add r3, r3, r0 - sub r2, r2, r1 - add r2, r2, r0 - + /* + * 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 r4, [r2] - sub r4, r4, r1 - add r4, r4, r0 - str r4, [r2] - add r2, r2, #4 + ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */ + add 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 - bne fixloop + blo fixloop #endif #endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */ clear_bss: #ifndef CONFIG_PRELOADER - ldr r0, _bss_start - ldr r1, _bss_end + ldr r0, _bss_start_ofs + ldr r1, _bss_end_ofs ldr r3, _TEXT_BASE /* Text base */ mov r4, r7 /* reloc addr */ - sub r0, r0, r3 add r0, r0, r4 - sub r1, r1, r3 add r1, r1, r4 mov r2, #0x00000000 /* clear */ @@ -287,24 +278,33 @@ clbss_l:str r2, [r0] /* clear loop... */ * initialization, now running from RAM. */ #ifdef CONFIG_NAND_SPL - ldr pc, _nand_boot + ldr r0, _nand_boot_ofs + mov pc, r0 -_nand_boot: .word nand_boot +_nand_boot_ofs: + .word nand_boot #else - ldr r0, _TEXT_BASE - ldr r2, _board_init_r - sub r2, r2, r0 - add r2, r2, r7 /* position from board_init_r in RAM */ + 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 lr, r2 mov pc, lr -_board_init_r: .word board_init_r +_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 @@ -333,10 +333,8 @@ relocate: /* relocate U-Boot to RAM */ 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] */ @@ -360,8 +358,11 @@ stack_setup: 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 @@ -374,13 +375,16 @@ clbss_l:str r2, [r0] /* clear loop... */ 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) */ @@ -469,7 +473,7 @@ cpu_init_crit: sub sp, sp, #S_FRAME_SIZE stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12 #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) - ldr r2, _armboot_start + 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 #else @@ -507,7 +511,7 @@ cpu_init_crit: .macro get_bad_stack #if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) - ldr r13, _armboot_start @ setup our mode stack + 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 #else |