@@ -34,8 +34,7 @@
used instead of the auto-probing which utilizes the register.
config REMAP_VECTORS_TO_RAM
- bool 'Install vectors to the beginning of RAM' if DRAM_BASE
- depends on DRAM_BASE
+ bool 'Install vectors to the beginning of RAM'
help
The kernel needs to change the hardware exception vectors.
In nommu mode, the hardware exception vectors are normally
@@ -31,12 +31,23 @@
{
}
+static void __init devicemaps_init(struct machine_desc *mdesc)
+{
+ /*
+ * Ask the machine support to map in the statically mapped devices.
+ */
+ if (mdesc->map_io)
+ mdesc->map_io();
+}
+
/*
* paging_init() sets up the page tables, initialises the zone memory
* maps, and sets up the zero page, bad page and bad page tables.
*/
void __init paging_init(struct machine_desc *mdesc)
{
+ devicemaps_init(mdesc);
+
bootmem_init();
}
Hi. I'd like to try linux on an AT91SAM9G20 (i have a linuxstamp board), with MMU disabled (the Hyok-Sung Choi & Hee-Chul Yun paper demonstrate that it could be possible). All the code seems to be present in the kernel... So i would like to share my experience. (1) I had to make two little changes in the kernel code : - I'm not able to change the REMAP_VECTOR_TO_DRAM. I have submitted the problem to the kbuild mailing list (http://www.spinics.net/lists/linux-kbuild/msg06153.html). - The soc_detect code that init the at91_soc_initdata structure is never called. Later this structure is used unitialized. I'm currently using the joined patch as a workaround. Someone can review it please ? (2) I used to run the module with a "classic system" based on linux + eglibc, and i needed only one toolchain (arm-xxx-linux-gnueabi) for the kernel and the userspace apps. I found that for the nommu case i wasn't able to build the kernel with the userspace toolchain. So I had to build 2 toolchain, based on binutils 2.22, gcc 4.7, uclibc 0.9.33.1 and linux 3.2.14 : - an arm-xxx-eabi toolchain for the kernel - an arm-xxx-uclinux-uclibceabi for the userspace apps Do you confirm that it is not possible to compile the kernel with arm-xxx-uclinux-uclibceabi ? Or, may i have misconfigured the toolchain (i join the toolchain build procedure) ? (3) The arm-xxx-uclinux-uclibceabi with elf2flt seems to produce running bins only if it is build with the uClibc DOPIC not set. Is it required to disable DOPIC ? Moreover, i can't run bins produced with a arm-xxx-linux-uclibceabi toolchain and -Wl,-elf2flt (not uclinux one). Is it the expected behavior ? (4) The elf2flt needs to be updated to be aware of the exidx section, and some reloc types. I join the patch i currently use. Given these observations, i've been able to run a linux with an hello world as the /init process. My next tests will be to run threaded programs, c++ programs, then busybox. Thanks for your attention. Paul. From bd2014eb59dea812e396a5f299f53ed03629bdad Mon Sep 17 00:00:00 2001 From: Paul Chavent <pchavent@wdcsd911h.onecert.fr> Date: Fri, 27 Apr 2012 10:09:20 +0200 Subject: [PATCH] Update arm support. --- .gitignore | 1 + Makefile.in | 2 +- arm-elf2flt.ld | 221 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ elf2flt.c | 27 +++++++ 4 files changed, 250 insertions(+), 1 deletions(-) create mode 100644 arm-elf2flt.ld diff --git a/.gitignore b/.gitignore index 92ff5f6..e0e0bd5 100644 --- a/.gitignore +++ b/.gitignore @@ -22,3 +22,4 @@ elf2flt elf2flt.ld flthdr ld-elf2flt +ld-elf2flt.sh \ No newline at end of file diff --git a/Makefile.in b/Makefile.in index 81e1afc..f98421e 100644 --- a/Makefile.in +++ b/Makefile.in @@ -42,7 +42,7 @@ ifneq ($(strip $(shell gcc -v 2>&1 | grep "cygwin")),) endif LDFILE= elf2flt.ld -ifeq ($(strip $(CPU)),e1) +ifeq ($(filter-out e1 arm,$(CPU)),) SRC_LDFILE= $(srcdir)/$(CPU)-elf2flt.ld else SRC_LDFILE= elf2flt.ld diff --git a/arm-elf2flt.ld b/arm-elf2flt.ld new file mode 100644 index 0000000..b57999c --- /dev/null +++ b/arm-elf2flt.ld @@ -0,0 +1,221 @@ + +ENTRY (_start) + +MEMORY { + flatmem : ORIGIN = 0x0, LENGTH = 0x1000000 +} + +PHDRS { + text PT_LOAD ; + data PT_LOAD ; +} + +SECTIONS { + + .text 0x0 : { + . = ALIGN(0x4) ; + _stext = . ; + *(.text) + *(.text.*) + *(.gnu.warning) + *(.stub) + *(.gnu.linkonce.t*) + *(.glue_7t) + *(.glue_7) + *(.vfp11_veneer) + *(.jcr) + KEEP (*(.init)) + KEEP (*(.fini)) + +W_RODAT *(.rodata) +W_RODAT *(.rodata1) +W_RODAT *(.rodata.*) +W_RODAT *(.gnu.linkonce.r*) + + /* .ARM.extab name sections containing exception unwinding information */ + *(.ARM.extab* .gnu.linkonce.armextab.*) + /* This is special code area at the end of the normal + text section. It contains a small lookup table at + the start followed by the code pointed to by entries + in the lookup table. */ + . = ALIGN (4) ; + PROVIDE(__ctbp = .); + *(.call_table_data) + *(.call_table_text) + } > flatmem :text + + /* .ARM.exidx name sections containing index entries for section unwinding */ + /* .ARM.exidx is sorted, so has to go in its own output section. */ + __exidx_start = .; + .ARM.exidx : + { + *(.ARM.exidx* .gnu.linkonce.armexidx.*) + } > flatmem + __exidx_end = .; + + . = ALIGN(0x20) ; + _etext = . ; + + .data : { + . = ALIGN(0x4) ; + _sdata = . ; + __data_start = . ; + data_start = . ; + *(.got.plt) + *(.got) + FILL(0) ; + . = ALIGN(0x20) ; + LONG(-1) + . = ALIGN(0x20) ; +R_RODAT *(.rodata) +R_RODAT *(.rodata1) +R_RODAT *(.rodata.*) +R_RODAT *(.gnu.linkonce.r*) + *(.data) + *(.data1) + *(.data.*) + *(.gnu.linkonce.d*) + + /* Microblaze has .sdata and .sbss (small bss). They must + be contiguous, so please don't move any of this. JW */ + _ssrw = . ; + *(.sdata) + *(.sdata.*) + *(.sbss) /* Don't move this! */ + *(.gnu.linkonce.sb*) + _essrw = . ; + + _ssrw_size = _essrw - _ssrw; + PROVIDE(_SDA_BASE_ = _ssrw + (_ssrw_size / 2)); + + *(.gnu.linkonce.s.*) + *(__libc_atexit) + *(__libc_subinit) + *(__libc_subfreeres) + + /* microblaze-specific read-only small data area + and associated locating symbols */ + _ssro = . ; + *(.sdata2) + _essro = . ; + _ssro_size = _essro - _ssro; + PROVIDE(_SDA2_BASE_ = _ssro + (_ssro_size / 2)); + + . = ALIGN(4) ; +TOR: __CTOR_LIST__ = .; +TOR: LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) +SINGLE_LINK: /* gcc uses crtbegin.o to find the start of +SINGLE_LINK: the constructors, so we make sure it is +SINGLE_LINK: first. Because this is a wildcard, it +SINGLE_LINK: doesn't matter if the user does not +SINGLE_LINK: actually link against crtbegin.o; the +SINGLE_LINK: linker won't look for a file to match a +SINGLE_LINK: wildcard. The wildcard also means that it +SINGLE_LINK: doesn't matter which directory crtbegin.o +SINGLE_LINK: is in. */ +SINGLE_LINK: KEEP (*crtbegin*.o(.ctors)) +SINGLE_LINK: /* We don't want to include the .ctor section from +SINGLE_LINK: from the crtend.o file until after the sorted ctors. +SINGLE_LINK: The .ctor section from the crtend file contains the +SINGLE_LINK: end of ctors marker and it must be last */ +SINGLE_LINK: KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors)) +SINGLE_LINK: KEEP (*(SORT(.ctors.*))) + KEEP (*(.ctors)) +TOR: LONG(0) +TOR: __CTOR_END__ = .; +TOR: __DTOR_LIST__ = .; +TOR: LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) +SINGLE_LINK: KEEP (*crtbegin*.o(.dtors)) +SINGLE_LINK: KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors)) +SINGLE_LINK: KEEP (*(SORT(.dtors.*))) + KEEP (*(.dtors)) +TOR: LONG(0) +TOR: __DTOR_END__ = .; + + PROVIDE (__preinit_array_start = .); + KEEP (*(.preinit_array)) + PROVIDE (__preinit_array_end = .); + + PROVIDE (__init_array_start = .); + KEEP (*(SORT(.init_array.*))) + KEEP (*(.init_array)) + PROVIDE (__init_array_end = .); + + PROVIDE (__fini_array_start = .); + KEEP (*(.fini_array)) + KEEP (*(SORT(.fini_array.*))) + PROVIDE (__fini_array_end = .); + } > flatmem :data + + .note.ABI-tag : { *(.note.ABI-tag) } > flatmem + .eh_frame_hdr : { *(.eh_frame_hdr) } > flatmem + .eh_frame : { KEEP(*(.eh_frame)) } > flatmem + .gcc_except_table : { + KEEP(*(.gcc_except_table)) + KEEP(*(.gcc_except_table.*)) + } >flatmem + + . = ALIGN(0x10) ; + _edata = . ; + + .bss : { + . = ALIGN(0x4) ; + _sbss = ALIGN(0x4) ; + __bss_start = . ; + *(.dynsbss) + *(.sbss) + *(.sbss.*) + *(.scommon) + *(.dynbss) + *(.bss) + *(.bss.*) + *(.bss*) + *(.gnu.linkonce.b*) + *(COMMON) + . = ALIGN(0x10) ; + _ebss = . ; + _end = . ; + end = . ; + } > flatmem + + .stack : { + . = ALIGN(0x4); + _stack_start = .; + } + + .junk 0 : { *(.rel*) *(.rela*) } + /DISCARD/ : { *(.note.GNU-stack) } + /* Stabs debugging sections. */ + .stab 0 : { *(.stab) } + .stabstr 0 : { *(.stabstr) } + .stab.excl 0 : { *(.stab.excl) } + .stab.exclstr 0 : { *(.stab.exclstr) } + .stab.index 0 : { *(.stab.index) } + .stab.indexstr 0 : { *(.stab.indexstr) } + .comment 0 : { *(.comment) } + /* DWARF debug sections. + Symbols in the DWARF debugging sections are relative to the beginning + of the section so we begin them at 0. */ + /* DWARF 1 */ + .debug 0 : { *(.debug) } + .line 0 : { *(.line) } + /* GNU DWARF 1 extensions */ + .debug_srcinfo 0 : { *(.debug_srcinfo) } + .debug_sfnames 0 : { *(.debug_sfnames) } + /* DWARF 1.1 and DWARF 2 */ + .debug_aranges 0 : { *(.debug_aranges) } + .debug_pubnames 0 : { *(.debug_pubnames) } + /* DWARF 2 */ + .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } + .debug_abbrev 0 : { *(.debug_abbrev) } + .debug_line 0 : { *(.debug_line) } + .debug_frame 0 : { *(.debug_frame) } + .debug_str 0 : { *(.debug_str) } + .debug_loc 0 : { *(.debug_loc) } + .debug_macinfo 0 : { *(.debug_macinfo) } + /* SGI/MIPS DWARF 2 extensions */ + .debug_weaknames 0 : { *(.debug_weaknames) } + .debug_funcnames 0 : { *(.debug_funcnames) } + .debug_typenames 0 : { *(.debug_typenames) } + .debug_varnames 0 : { *(.debug_varnames) } +} diff --git a/elf2flt.c b/elf2flt.c index 2fea9b5..1a7ef88 100644 --- a/elf2flt.c +++ b/elf2flt.c @@ -54,6 +54,8 @@ const char *elf2flt_progname; #if defined(TARGET_h8300) #include <elf/h8.h> /* TARGET_* ELF support for the BFD library */ +#elif defined(TARGET_arm) +#include "elf/arm.h" #elif defined(__CYGWIN__) || defined(__MINGW32__) || defined(TARGET_nios) || defined(TARGET_nios2) #include "cygwin-elf.h" /* Cygwin uses a local copy */ #elif defined(TARGET_microblaze) @@ -639,12 +641,16 @@ dump_symbols(symbols, number_of_symbols); relocation_needed = 1; break; case R_ARM_REL32: + case R_ARM_JUMP24: + case R_ARM_CALL: case R_ARM_THM_PC11: case R_ARM_THM_PC22: case R_ARM_PC24: case R_ARM_PLT32: case R_ARM_GOTPC: case R_ARM_GOT32: + case R_ARM_PREL31: + case R_ARM_NONE: relocation_needed = 0; break; default: @@ -1702,6 +1708,27 @@ int main(int argc, char *argv[]) } } + if (verbose) { + printf(" verbose = %d\n" + " load_to_ram = %d\n" + " ktrace = %d\n" + " docompress = %d\n" + " pfile = \"%s\"\n" + " ofile = \"%s\"\n" + " use_resolved = %d\n" + " stack = %d\n" + " rel_file = \"%s\\n", + verbose , + load_to_ram , + ktrace , + docompress , + pfile , + ofile , + use_resolved, + stack , + rel_file ); + } + /* * if neither the -r or -p options was given, default to * a RAM load as that is the only option that makes sense.