[Bug binutils/24321] Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries
https://sourceware.org/bugzilla/show_bug.cgi?id=24321 --- Comment #4 from Manoj Gupta --- Thanks, Looks like the internal tooling had an incorrect assumption. Sorry for the noise. -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug binutils/24321] Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries
https://sourceware.org/bugzilla/show_bug.cgi?id=24321 Manoj Gupta changed: What|Removed |Added Status|RESOLVED|UNCONFIRMED Resolution|INVALID |--- --- Comment #2 from Manoj Gupta --- Here is the problem: --only-keep-debug is supposed to preserve the section headers. But it is not doing so. Our tooling and public tools like Linux perf relies on section headers in splitdebug files to match original binary. Linking to the documentation of --only-keep-debug in objcopy at https://sourceware.org/binutils/docs/binutils/objcopy.html where it says that sections headers are preserved. " --only-keep-debug Strip a file, removing contents of any sections that would not be stripped by --strip-debug and leaving the debugging sections intact. In ELF files, this preserves all note sections in the output. Note - the section headers of the stripped sections are preserved, including their sizes, but the contents of the section are discarded. The section headers are preserved so that other tools can match up the debuginfo file with the real executable, even if that executable has been relocated to a different address space. " Note: Sorry about causing the in --keep-debug". I just wanted to illustrate that eu-strip preserves the headers correctly. eu-strip however does not support --only-keep-debug" and has a different way of generating splitdebug files which is via "--kep-debug" -f option. I am NOT using "--keep-debug" option with GNU strip when generating the splitdebug files. -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug binutils/24321] Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries
https://sourceware.org/bugzilla/show_bug.cgi?id=24321 Manoj Gupta changed: What|Removed |Added CC||ruiu at google dot com -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug binutils/24321] New: Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries
https://sourceware.org/bugzilla/show_bug.cgi?id=24321 Bug ID: 24321 Summary: Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries Product: binutils Version: unspecified Status: UNCONFIRMED Severity: normal Priority: P2 Component: binutils Assignee: unassigned at sourceware dot org Reporter: manojgupta at google dot com Target Milestone: --- We discovered that objcopy creates bad Offsets in LOAD section when generating split-debug files for lld built binaries. This is breaking tools e.g Linux Perf and more tools that rely on the splitdebug file for symbolization. The shared file has a tblgen binary that was built with LLD. https://drive.google.com/file/d/1PTlbzG7nqdu_TLRlpMdKasuBcG0r0LIu/view?usp=sharing Type Offset VirtAddr PhysAddr $ readelf -l tblgen/tblgen|grep LOAD LOAD 0x 0x0020 0x0020 LOAD 0x00722000 0x00922000 0x00922000 # Generate a split-debug debug info file with objcopy $objcopy --only-keep-debug tblgen tblgen.dbg $ readelf -l tblgen.dbg|grep LOAD LOAD 0x 0x0020 0x0020 LOAD 0x1000 0x00922000 0x00922000 The Offset field for second LOAD entry is BAD, it should have been 0x00722000. If I use eu-strip from elfutils, the offsets are correct. $ eu-strip --strip-debug tblgen -f tblgen.debug $ readelf -l tblgen.debug |grep LOAD LOAD 0x 0x0020 0x0020 LOAD 0x00722000 0x00922000 0x00922000 -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug binutils/24321] Objcopy "--only-keep-debug" generates Bad Offset in LOAD sections for lld built binaries
https://sourceware.org/bugzilla/show_bug.cgi?id=24321 Manoj Gupta changed: What|Removed |Added CC||amodra at gmail dot com, ||manojgupta at google dot com -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 --- Comment #6 from Manoj Gupta --- Thanks a lot! -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 Manoj Gupta changed: What|Removed |Added CC||matthew.wahab at arm dot com -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 Manoj Gupta changed: What|Removed |Added CC||ramana.radhakrishnan at foss dot a ||rm.com -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 Manoj Gupta changed: What|Removed |Added CC||rahulchaudhry at chromium dot org, ||ramana.radhakrishnan@codito ||.com, ramana at sourceware dot org -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 --- Comment #3 from Manoj Gupta --- Created attachment 10129 --> https://sourceware.org/bugzilla/attachment.cgi?id=10129=edit Original glibc clone.S file -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 --- Comment #2 from Manoj Gupta --- Created attachment 10128 --> https://sourceware.org/bugzilla/attachment.cgi?id=10128=edit Good assembly from 2.25 -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 Manoj Gupta changed: What|Removed |Added CC||manojgupta at google dot com --- Comment #1 from Manoj Gupta --- Created attachment 10127 --> https://sourceware.org/bugzilla/attachment.cgi?id=10127=edit Bad assembly file generated -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
[Bug gas/21590] New: Arm assembler generates incorrect transformation from ldr to movs
https://sourceware.org/bugzilla/show_bug.cgi?id=21590 Bug ID: 21590 Summary: Arm assembler generates incorrect transformation from ldr to movs Product: binutils Version: 2.27 Status: UNCONFIRMED Severity: normal Priority: P2 Component: gas Assignee: unassigned at sourceware dot org Reporter: manojgupta at google dot com Target Milestone: --- Created attachment 10126 --> https://sourceware.org/bugzilla/attachment.cgi?id=10126=edit Arm input assembly The attached file clone.S from glibc-2.23/sysdeps/unix/sysv/linux/arm/clone.S is incorrectly handled in assembler from binutils 2.27. In the good version: 3e: f41c 7f80 tst.w ip, #256; 0x100 42: 4f08ldr r7, [pc, #32] ; (64 <__clone+0x64>) 44: bf14ite ne 46: f04f 30ff movne.w r0, #4294967295 ; 0x Note that ite/movnew instructions depend on condition codes generated by tst.w. bad version, ldr is replaced by movs: 3e: f41c 7f80 tst.w ip, #256; 0x100 42: 2714movsr7, #20 44: bf14ite ne 46: f04f 30ff movne.w r0, #4294967295 ; 0x According to ARM assembly docs for MOV: If S is specified, the instruction: Updates the N and Z flags according to the result. Can update the C flag during the calculation of Operand2. Does not affect the V flag. So movs incorrectly changes the condition flags generated by tst.w. -- You are receiving this mail because: You are on the CC list for the bug. ___ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
