Commit 6d8d4ef9 authored by Wolfgang Denk's avatar Wolfgang Denk
Browse files

Merge branch 'elf_reloc'



Conflicts:
	arch/arm/include/asm/config.h
	board/LaCie/edminiv2/config.mk
	board/karo/tx25/config.mk
	board/logicpd/imx27lite/config.mk
	doc/README.arm-relocation
Signed-off-by: default avatarWolfgang Denk <wd@denx.de>
parents 083d5069 bafe7437
......@@ -33,11 +33,6 @@ STANDALONE_LOAD_ADDR = 0xc100000
endif
endif
ifndef CONFIG_SYS_ARM_WITHOUT_RELOC
# needed for relocation
PLATFORM_RELFLAGS += -fPIC
endif
ifdef CONFIG_SYS_ARM_WITHOUT_RELOC
PLATFORM_CPPFLAGS += -DCONFIG_SYS_ARM_WITHOUT_RELOC
endif
......@@ -72,3 +67,10 @@ PLATFORM_LIBS += $(OBJTREE)/arch/arm/lib/eabi_compat.o
endif
endif
LDSCRIPT := $(SRCTREE)/$(CPUDIR)/u-boot.lds
ifndef CONFIG_SYS_ARM_WITHOUT_RELOC
# needed for relocation
ifndef CONFIG_NAND_SPL
PLATFORM_LDFLAGS += -pie
endif
endif
......@@ -89,48 +89,35 @@ _end_vect:
_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_end
_bss_end:
.word _end
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
.globl _datarel_start
_datarel_start:
.word __datarel_start
.globl _bss_start_ofs
_bss_start_ofs:
.word __bss_start - _start
.globl _datarelrolocal_start
_datarelrolocal_start:
.word __datarelrolocal_start
.globl _bss_end_ofs
_bss_end_ofs:
.word _end - _start
.globl _datarellocal_start
_datarellocal_start:
.word __datarellocal_start
.globl _datarel_start_ofs
_datarel_start_ofs:
.word __datarel_start - _start
.globl _datarelro_start
_datarelro_start:
.word __datarelro_start
.globl _datarelrolocal_start_ofs
_datarelrolocal_start_ofs:
.word __datarelrolocal_start - _start
.globl _got_start
_got_start:
.word __got_start
.globl _datarellocal_start_ofs
_datarellocal_start_ofs:
.word __datarellocal_start - _start
.globl _got_end
_got_end:
.word __got_end
#endif
.globl _datarelro_start_ofs
_datarelro_start_ofs:
.word __datarelro_start - _start
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
......@@ -225,9 +212,8 @@ 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
......@@ -239,36 +225,54 @@ copy_loop:
blo copy_loop
#ifndef CONFIG_PRELOADER
/* fix got entries */
ldr r1, _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
ble 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 */
......@@ -283,24 +287,34 @@ clbss_l:str r2, [r0] /* clear loop... */
* initialization, now running from RAM.
*/
#ifdef CONFIG_NAND_SPL
ldr pc, _nand_boot
_nand_boot: .word nand_boot
ldr r0, _nand_boot_ofs
adr r1, _start
add pc, r0, r1
_nand_boot_ofs
: .word nand_boot - _start
#else
jump_2_ram:
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
......@@ -375,8 +389,11 @@ 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
......@@ -386,15 +403,19 @@ clbss_l:str r2, [r0] /* clear loop... */
bne clbss_l
#endif
ldr pc, _start_armboot
ldr r0, _start_armboot_ofs
adr r1, _start
add r0, r0, r1
ldr pc, r0
_start_armboot_ofs:
#ifdef CONFIG_NAND_SPL
_start_armboot: .word nand_boot
.word nand_boot - _start
#else
#ifdef CONFIG_ONENAND_IPL
_start_armboot: .word start_oneboot
.word start_oneboot - _start
#else
_start_armboot: .word start_armboot
.word start_armboot - _start
#endif /* CONFIG_ONENAND_IPL */
#endif /* CONFIG_NAND_SPL */
......@@ -487,7 +508,7 @@ cpu_init_crit:
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort stack
#else
ldr r2, _armboot_start
adr r2, _start
sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
#endif
......@@ -524,8 +545,8 @@ cpu_init_crit:
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter in banked mode)
#else
ldr r13, _armboot_start @ setup our mode stack (enter in banked mode)
sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
adr r13, _start @ setup our mode stack (enter in banked mode)
sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move to reserved a couple spots for abort stack
#endif
......
......@@ -59,11 +59,14 @@ SECTIONS
*(.data.rel.ro)
}
__got_start = .;
. = ALIGN(4);
.got : { *(.got) }
__rel_dyn_start = .;
.rel.dyn : { *(.rel.dyn) }
__rel_dyn_end = .;
__dynsym_start = .;
.dynsym : { *(.dynsym) }
__got_end = .;
. = .;
__u_boot_cmd_start = .;
.u_boot_cmd : { *(.u_boot_cmd) }
......@@ -73,4 +76,10 @@ SECTIONS
__bss_start = .;
.bss (NOLOAD) : { *(.bss) . = ALIGN(4); }
_end = .;
/DISCARD/ : { *(.dynstr*) }
/DISCARD/ : { *(.dynamic*) }
/DISCARD/ : { *(.plt*) }
/DISCARD/ : { *(.interp*) }
/DISCARD/ : { *(.gnu*) }
}
......@@ -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
......
......@@ -41,21 +41,19 @@ SECTIONS
. = ALIGN(4);
.data : {
*(.data)
__datarel_start = .;
*(.data.rel)
__datarelrolocal_start = .;
*(.data.rel.ro.local)
__datarellocal_start = .;
*(.data.rel.local)
__datarelro_start = .;
*(.data.rel.ro)
}
__got_start = .;
. = ALIGN(4);
.got : { *(.got) }
__got_end = .;
__rel_dyn_start = .;
.rel.dyn : { *(.rel.dyn) }
__rel_dyn_end = .;
__dynsym_start = .;
.dynsym : { *(.dynsym) }
. = ALIGN(4);
. = .;
__u_boot_cmd_start = .;
.u_boot_cmd : { *(.u_boot_cmd) }
......@@ -65,4 +63,10 @@ SECTIONS
__bss_start = .;
.bss (NOLOAD) : { *(.bss) . = ALIGN(4); }
_end = .;
/DISCARD/ : { *(.dynstr*) }
/DISCARD/ : { *(.dynamic*) }
/DISCARD/ : { *(.plt*) }
/DISCARD/ : { *(.interp*) }
/DISCARD/ : { *(.gnu*) }
}
......@@ -78,13 +78,13 @@ _armboot_start:
/*