[uClinux-dev] [PATCH] allow to build arm flat binaries

[Waldemar Brodkorb]

Add patchset from ptxdist which is required to produce working
ARM flat binaries. Tested with busybox on Kinetis K70.

Signed-off-by: Waldemar Brodkorb <***@openadk.org>
---

After this patch is upstream, I want to send an update
patch to buildroot to use your repository. Then I will
take my copy of elf2flt offline.

Without the fprintf changes I get segfaults.

---
elf2flt.c | 19 ++++++++++++-------
elf2flt.ld.in | 17 ++++++++++++++---
2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/elf2flt.c b/elf2flt.c
index fcd797c..c6978e1 100644
--- a/elf2flt.c
+++ b/elf2flt.c
@@ -56,6 +56,8 @@ 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_xtensa)
@@ -646,16 +648,23 @@ dump_symbols(symbols, number_of_symbols);
default:
goto good_32bit_resolved_reloc;
#elif defined(TARGET_arm)
+ case R_ARM_TARGET1:
+ case R_ARM_TARGET2:
case R_ARM_ABS32:
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_THM_JUMP24:
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:
@@ -871,9 +880,7 @@ dump_symbols(symbols, number_of_symbols);
relocation_needed = 1;
if (verbose)
fprintf(stderr,
- "%s vma=0x%x, "
- "value=0x%"BFD_VMA_FMT"x, "
- "address=0x%"BFD_VMA_FMT"x "
+ "%s vma=0x%x, value=0x%x, address=0x%x "
"sym_addr=0x%x rs=0x%x, opcode=0x%x\n",
"ABS32",
sym_vma, (*(q->sym_ptr_ptr))->value,
@@ -890,9 +897,7 @@ dump_symbols(symbols, number_of_symbols);
case R_ARM_PLT32:
if (verbose)
fprintf(stderr,
- "%s vma=0x%x, "
- "value=0x%"BFD_VMA_FMT"x, "
- "address=0x%"BFD_VMA_FMT"x "
+ "%s vma=0x%x, value=0x%x, address=0x%x "
"sym_addr=0x%x rs=0x%x, opcode=0x%x\n",
"PLT32",
sym_vma, (*(q->sym_ptr_ptr))->value,
@@ -1446,7 +1451,7 @@ DIS29_RELOCATION:
}
}

- sprintf(&addstr[0], "+0x%lx", sym_addr - (*(q->sym_ptr_ptr))->value -
+ sprintf(&addstr[0], "+0x%x", sym_addr - (*(q->sym_ptr_ptr))->value -
bfd_section_vma(abs_bfd, sym_section));


diff --git a/elf2flt.ld.in b/elf2flt.ld.in
index bfda0ef..ec1fe6f 100644
--- a/elf2flt.ld.in
+++ b/elf2flt.ld.in
@@ -35,6 +35,8 @@ 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
@@ -43,11 +45,20 @@ W_RODAT *(.gnu.linkonce.r*)
PROVIDE(@***@__ctbp = .);
*(.call_table_data)
*(.call_table_text)
-
- . = ALIGN(0x20) ;
- @***@_etext = . ;
} > 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 = . ;
--
1.7.10.4

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[Thomas Petazzoni]

Hello all,

Post by Waldemar Brodkorb
Add patchset from ptxdist which is required to produce working
ARM flat binaries. Tested with busybox on Kinetis K70.

Tested-by: Thomas Petazzoni <***@free-electrons.com>

As Waldemar indicated in his v2, I tested this first version, and it
indeed produces working FLAT binaries for ARM noMMU, tested on
Cortex-M4 STM32F429.

Best regards,

Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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