https://sourceware.org/bugzilla/show_bug.cgi?id=27425
Bug ID: 27425
Summary: erroneous __ImageBase relocation using Microsoft COFF
.OBJ linked to .ELF x86_64
Product: binutils
Version: 2.36
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: minnowware at hotmail dot com
Target Milestone: ---
Hi H.J.
there are two (2) more bugs related closely to
https://sourceware.org/bugzilla/show_bug.cgi?id=26583 and
https://sourceware.org/bugzilla/show_bug.cgi?id=27171.
Microsoft COFF x86-64 introduces the "__ImageBase" relative addressing method.
In the .OBJ file a new relocation type is used: IMAGE_REL_AMD64_ADDR32NB.
Please find my comprehensive description here:
https://github.com/KilianKegel/GNU-ld-for-MicrosoftCOFF-to-LinuxELF#__imagebase-bugs
This is mishandled in 2 ways
1a. the 32Bit field ADDR32NB is a DISPLACEMENT only field, but initialized by
GNU ld with data offset + 64Bit __executable_start address
1b. the base address address register involved in this addressing scheme is
initialized to ZERO instead to __executable_start / __ImageBase
https://github.com/KilianKegel/GNU-ld-for-MicrosoftCOFF-to-LinuxELF#addr32nb-initialization-w-__imagebase
2. the symbol addresses taken for __ImageBase addressing scheme are wrong.
EIP relative addresses taken from the same section instead are correct.
https://github.com/KilianKegel/GNU-ld-for-MicrosoftCOFF-to-LinuxELF#addr32nb-offset-miscalculation
I would really appreciate if you could fix this issue.
Best regards,
Kilian
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