From: marcansoft Date: Fri, 26 Feb 2010 15:14:47 +0000 (+0000) Subject: Bootloader cleanup (UNTESTED!) X-Git-Tag: v1.0.0~305 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/86d319551864035038ea0b9355b6fa1815398bfd Bootloader cleanup (UNTESTED!) - Clean up bootloader asm - Remove fromflash.c - it's not worth doing in C, do it in ASM - Clean up linker script - Force use of symbol inside bootphase2 (otherwise linker garbage-collects it) - Link bootloader with gcc instead of ld --- diff --git a/bootrom/Makefile b/bootrom/Makefile index a3374b0c..0f661a8f 100644 --- a/bootrom/Makefile +++ b/bootrom/Makefile @@ -7,7 +7,7 @@ #----------------------------------------------------------------------------- # DO NOT use thumb mode in the phase 1 bootloader since that generates a section with glue code -ARMSRC = fromflash.c +ARMSRC = THUMBSRC = usb.c bootrom.c ASMSRC = ram-reset.s flash-reset.s @@ -27,7 +27,7 @@ include ../common/Makefile.common all: $(OBJDIR)/bootrom.s19 $(OBJDIR)/bootrom.elf: $(VERSIONOBJ) $(ASMOBJ) $(ARMOBJ) $(THUMBOBJ) - $(LD) -g -Tldscript-flash --oformat elf32-littlearm -Map=$(patsubst %.elf,%.map,$@) -o $@ $^ + $(CC) $(LDFLAGS) -Wl,-T,ldscript-flash,-Map,$(patsubst %.elf,%.map,$@) -o $@ $^ $(LIBS) clean: $(DELETE) $(OBJDIR)$(PATHSEP)*.o diff --git a/bootrom/flash-reset.s b/bootrom/flash-reset.s index 8b58636f..54ee15b0 100644 --- a/bootrom/flash-reset.s +++ b/bootrom/flash-reset.s @@ -6,46 +6,48 @@ @ Reset vector for running from FLASH @----------------------------------------------------------------------------- -.extern CopyBootToRAM - .section .startup,"ax" - .code 32 - .align 0 + +.arm .global flashstart flashstart: - b Reset - b UndefinedInstruction - b SoftwareInterrupt - b PrefetchAbort - b DataAbort - b Reserved - b Irq - b Fiq - -Reset: - ldr sp, .stack_end @ initialize stack pointer to top of RAM - bl CopyBootToRAM @ copy bootloader to RAM (in case the - @ user re-flashes the bootloader) - ldr r3, .bootphase2_start @ start address of RAM bootloader - bx r3 @ jump to it - - .stack_end: - .word _stack_end - .bootphase2_start: - .word __bootphase2_start__ - -Fiq: - b Fiq -UndefinedInstruction: - b UndefinedInstruction -SoftwareInterrupt: - b SoftwareInterrupt -PrefetchAbort: - b PrefetchAbort -DataAbort: - b DataAbort -Reserved: - b Reserved -Irq: - b Irq + b reset + b undefined_instruction + b software_interrupt + b prefetch_abort + b data_abort + b . @reserved + b irq + b fiq + +reset: + ldr sp, =_stack_end @ initialize stack pointer to top of RAM + + @ copy bootloader to RAM (in case the user re-flashes the bootloader) + ldr r0, =__bootphase2_src_start__ + ldr r1, =__bootphase2_start__ + ldr r2, =__bootphase2_end__ +1: + ldr r3, [r0], #4 + str r3, [r1], #4 + cmp r1, r2 + blo 1b + + ldr r3, =ram_start @ start address of RAM bootloader + bx r3 @ jump to it + + .ltorg + +undefined_instruction: + b . +software_interrupt: + b . +prefetch_abort: + b . +data_abort: + b . +irq: + b . +fiq: + b . diff --git a/bootrom/fromflash.c b/bootrom/fromflash.c deleted file mode 100644 index 81501fd0..00000000 --- a/bootrom/fromflash.c +++ /dev/null @@ -1,21 +0,0 @@ -//----------------------------------------------------------------------------- -// This code is licensed to you under the terms of the GNU GPL, version 2 or, -// at your option, any later version. See the LICENSE.txt file for the text of -// the license. -//----------------------------------------------------------------------------- -// Helper function for launching the bootloader from FLASH -//----------------------------------------------------------------------------- - -#include - -extern char __bootphase2_src_start__, __bootphase2_start__, __bootphase2_end__; -void __attribute__((section(".bootphase1"))) CopyBootToRAM(void) -{ - int i; - - volatile uint32_t *s = (volatile uint32_t *)&__bootphase2_src_start__; - volatile uint32_t *d = (volatile uint32_t *)&__bootphase2_start__; - unsigned int l = (int)&__bootphase2_end__ - (int)&__bootphase2_start__; - - for(i = 0; i < l/sizeof(uint32_t); i++) *d++ = *s++; -} diff --git a/bootrom/ldscript-flash b/bootrom/ldscript-flash index ba6384c5..5936a8fe 100644 --- a/bootrom/ldscript-flash +++ b/bootrom/ldscript-flash @@ -13,51 +13,44 @@ INCLUDE ../common/ldscript.common ENTRY(flashstart) SECTIONS { - . = 0; - - .bootphase1 : { - *(.startup) - *(.bootphase1) - - /* It seems to be impossible to flush align a section at the - end of a memory segment. Instead, we'll put the version_information - wherever the linker wants it, and then put a pointer to the start - of the version information at the end of the section. - -- Henryk Plötz 2009-08-28 */ - - _version_information_start = ABSOLUTE(.); - *(.version_information); - - /* Why doesn't this work even though _bootphase1_version_pointer = 0x1001fc? - . = _bootphase1_version_pointer - ORIGIN(bootphase1); */ - /* This works, apparently it fools the linker into accepting an absolute address */ - . = _bootphase1_version_pointer - ORIGIN(bootphase1) + ORIGIN(bootphase1); - LONG(_version_information_start) - } >bootphase1 - - __bootphase2_src_start__ = ORIGIN(bootphase2); - .bootphase2 : { - __bootphase2_start__ = .; - *(.startphase2) - *(.text) - *(.eh_frame) - *(.glue_7) - *(.glue_7t) - *(.rodata) - *(.data) - . = ALIGN( 32 / 8 ); - __bootphase2_end__ = .; - } >ram AT>bootphase2 - - .bss : { - __bss_start__ = .; - *(.bss) - } >ram - - . = ALIGN( 32 / 8 ); - __bss_end__ = .; - - .commonarea (NOLOAD) : { - *(.commonarea) - } >commonarea + .bootphase1 : { + *(.startup) + + . = ALIGN(4); + _version_information_start = .; + *(.version_information); + + . = LENGTH(bootphase1) - 0x4; + LONG(_version_information_start); + } >bootphase1 + + .bootphase2 : { + *(.startphase2) + *(.text) + *(.text.*) + *(.eh_frame) + *(.glue_7) + *(.glue_7t) + *(.rodata) + *(.rodata.*) + *(.data) + *(.data.*) + . = ALIGN(4); + } >ram AT>bootphase2 + + __bootphase2_src_start__ = LOADADDR(.bootphase2); + __bootphase2_start__ = ADDR(.bootphase2); + __bootphase2_end__ = __bootphase2_start__ + SIZEOF(.bootphase2); + + .bss : { + __bss_start__ = .; + *(.bss) + *(.bss.*) + . = ALIGN(4); + __bss_end__ = .; + } >ram + + .commonarea (NOLOAD) : { + *(.commonarea) + } >commonarea } diff --git a/bootrom/ram-reset.s b/bootrom/ram-reset.s index 34c950f6..ade70d8c 100644 --- a/bootrom/ram-reset.s +++ b/bootrom/ram-reset.s @@ -9,13 +9,12 @@ .extern BootROM .section .startphase2,"ax" - .code 32 - .align 0 -.global ramstart -ramstart: - ldr sp, .stack_end - bl BootROM +.arm - .stack_end: - .word _stack_end +.global ram_start +ram_start: + ldr sp, =_stack_end + bl BootROM + + .ltorg