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[Bug ld/29954] bpf sim tests fail due to linker triggering LOAD segment
From: |
jose.marchesi at oracle dot com |
Subject: |
[Bug ld/29954] bpf sim tests fail due to linker triggering LOAD segment with RWX permissions test by default |
Date: |
Tue, 03 Jan 2023 17:53:27 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=29954
--- Comment #2 from Jose E. Marchesi <jose.marchesi at oracle dot com> ---
Hi Nick.
I tried that locally and definitely works. But I don't think it is the right
fix in this case.
When linked without -Ttext=0x0, the following segments are created in the
resulting executable:
Elf file type is EXEC (Executable file)
Entry point 0x400000
There are 2 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000100000 0x0000000000400000 0x0000000000400000
0x0000000000000648 0x0000000000000648 R E 0x100000
LOAD 0x0000000000101648 0x0000000000801648 0x0000000000801648
0x0000000000000006 0x0000000000000006 RW 0x100000
Section to Segment mapping:
Segment Sections...
00 .text
01 .data
Which is perfectly fine. But then it is the simulator that fails with:
spawn ./bpf/run --memory-size=4Mb
/home/jemarch/gnu/src/binutils-gdb/build-bpf/sim/alu.s.x
core: 8 byte read to unmapped address 0x400000 at 0x400000
Meaning the simulator is somehow not loading the segments at the right VMA.
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