Hello,
I am experiencing problems with recent GNU ld packages. The short
version is that the COFF object file reader seems to not determine the
.text section correct size, thus ld panics, complaining about a bad
relocation.
I have also to make clear, that though i experience this using cross
compiling tools (linux-win32), cygwin users have the same problems,
that's why i post this bug report here (the binutils-bug list seems to
be a spam list)
Here is a more detailed report:
The buggy coff file can be obtained thanks to the assembly file
attached. This is the most reduced code i could do that triggers the
bug.
$ nasm -f elf -DPREFIX -o ld-bug.obj ld-bug.asm
When trying to link that file, i always have this error with GNU ld
2.14 (no errors with GNU ld 2.13):
ld-bug.obj: bad reloc address 0xa1 in section `.text'
So here we go, with a GNU ld 2.13, objdump -x reports that (only
relevent parts):
$ i386-mingw32-objdump -x ld-bug.obj
[...]
Sections:
Idx Nom TailleVMA LMA Fich off Algn
0 .data 000c 0064 2**2
CONTENTS, ALLOC, LOAD, DATA
1 .text 00f3 0070 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
[...]
But GNU ld 2.14 (and current head cvs as well):
[...]
Sections:
Idx Nom TailleVMA LMA Fich off Algn
0 .data 000c 0064 2**2
CONTENTS, ALLOC, LOAD, DATA
1 .text 000c 0070 2**4
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
[...]
Note that the .text section is wrong in the second case.
I triedtodebug GNUld tofind wherethe
(section_type_struct)-_raw_size field was set... but no luck. Is there
in this list a GNU ld (coff) guru wanting to help me spot and crush the
bug ?
--
Edouard Gomez
BITS 32
;;
;; Macros
;;
%macro cglobal 1
%ifdef PREFIX
global _%1
%define %1 _%1
%else
global %1
%endif
%endmacro
%define CPUID_TSC 0x0010
%define CPUID_MMX 0x0080
%define CPUID_SSE 0x0200
%define CPUID_SSE2 0x0400
%define EXT_CPUID_3DNOW0x8000
%define EXT_CPUID_AMD_3DNOWEXT 0x4000
%define EXT_CPUID_AMD_MMXEXT 0x0040
%define XVID_CPU_MMX (1 0)
%define XVID_CPU_MMXEXT (1 1)
%define XVID_CPU_SSE (1 2)
%define XVID_CPU_SSE2 (1 3)
%define XVID_CPU_3DNOW(1 4)
%define XVID_CPU_3DNOWEXT (1 5)
%define XVID_CPU_TSC (1 6)
;; CHECK_FEATURE
;; arg1: cpu feature bit as defined by the cpu spec
;; arg2: cpu feature bit as defined in XviD
;; arg3: register where to store the result
%macro CHECK_FEATURE 3
mov ecx, %1
and ecx, edx
neg ecx
sbb ecx, ecx
and ecx, %2
or %3, ecx
%endmacro
;;
;; Data
;;
SECTION .data
vendorAMD:
db AuthenticAMD
;;
;; Code
;;
SECTION .text
;;
;; uint32_t do_cpuid(void)
;; returns cpuid info
ALIGN 16
cglobal do_cpuid
do_cpuid:
pushebx
pushesi
pushedi
pushebp
xor ebp, ebp
; CPUID command ?
pushfd
pop eax
mov ecx, eax
xor eax, 0x0020
pusheax
popfd
pushfd
pop eax
cmp eax, ecx
jz near .cpu_quit ; no CPUID command - exit
; get vendor string, used later
xor eax, eax
cpuid
mov [esp-12], ebx ; vendor string
mov [esp-12+4], edx
mov [esp-12+8], ecx
testeax, eax
jz near .cpu_quit
mov eax, 1
cpuid
; RDTSC command ?
CHECK_FEATURE CPUID_TSC, XVID_CPU_TSC, ebp
; MMX support ?
CHECK_FEATURE CPUID_MMX, XVID_CPU_MMX, ebp
; SSE support ?
CHECK_FEATURE CPUID_SSE, (XVID_CPU_MMXEXT|XVID_CPU_SSE), ebp
; SSE2 support?
CHECK_FEATURE CPUID_SSE2, XVID_CPU_SSE2, ebp
; extended functions?
mov eax, 0x8000
cpuid
cmp eax, 0x8000
jbe near .cpu_quit ; No extended features, quit
; Yes there is
mov eax, 0x8001
cpuid
; Compare
