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[Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) b
From: |
Peter Maydell |
Subject: |
[Bug 1914021] Re: qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-debug exited normally |
Date: |
Mon, 01 Feb 2021 13:54:47 -0000 |
Oh, your code is trying to use the SYS_HEAPINFO semihosting call to
figure out where the stack and heap are. This is generally a bad idea if
you're using QEMU user-mode emulation: you start with a perfectly good
stack pointer and you should just use the usual Linux syscalls to
allocate heap if you need it.
I have no idea where your code is getting r1 from -- it's too painful to
try to reverse-engineer it from the binary. I can't repro any difference
between with-gdb and without -- for me with current QEMU r1 is 0 whether
running with the gdb stub or not.
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https://bugs.launchpad.net/bugs/1914021
Title:
qemu: uncaught target signal 4 (Illegal instruction) but gdb remote-
debug exited normally
Status in QEMU:
New
Bug description:
I'm getting Illegal instruction (core dumped) when running the
attached a.out_err binary in qemu, but when using Gdb to remote-debug
the program, it exited normally. will appreciate if you can help look
into this qemu issue.
readelf -h a.out_err
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8220
Start of program headers: 52 (bytes into file)
Start of section headers: 54228 (bytes into file)
Flags: 0x5000200, Version5 EABI, soft-float ABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 3
Size of section headers: 40 (bytes)
Number of section headers: 16
Section header string table index: 15
qemu-arm version 4.0.0
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