diff options
Diffstat (limited to 'content')
| -rw-r--r-- | content/2019-10-27-kernel-debugging-qemu.md | 4 | ||||
| -rw-r--r-- | content/2019-11-18-dynamic-linking-linux-x86_64.md | 8 | ||||
| -rw-r--r-- | content/2021-05-15-pthread_cancel-noexcept.md | 4 | ||||
| -rw-r--r-- | content/2021-12-02-toying-with-virtio.md | 2 |
4 files changed, 9 insertions, 9 deletions
diff --git a/content/2019-10-27-kernel-debugging-qemu.md b/content/2019-10-27-kernel-debugging-qemu.md index 24cc6ee..518b3d5 100644 --- a/content/2019-10-27-kernel-debugging-qemu.md +++ b/content/2019-10-27-kernel-debugging-qemu.md @@ -135,7 +135,7 @@ Breakpoint 1, do_execve (filename=0xffff888000060000, __argv=0xffffffff8181e160 ## Appendix: Try to get around `<optimized out>` When debugging the kernel we often face following situation in gdb: -```text +``` (gdb) frame #0 do_execveat_common (fd=fd@entry=-100, filename=0xffff888000120000, argv=argv@entry=..., envp=envp@entry=..., flags=flags@entry=0) at fs/exec.c @@ -165,7 +165,7 @@ ccflags-y := -Og After enabling optimize for debug experience `-Og` we can see the following now in gdb: -```txt +``` (gdb) frame #0 do_execveat_common (fd=fd@entry=-100, filename=0xffff888000120000, argv=argv@entry=..., envp=envp@entry=..., flags=flags@entry=0) at fs/exec.c diff --git a/content/2019-11-18-dynamic-linking-linux-x86_64.md b/content/2019-11-18-dynamic-linking-linux-x86_64.md index bc39e0f..496ec24 100644 --- a/content/2019-11-18-dynamic-linking-linux-x86_64.md +++ b/content/2019-11-18-dynamic-linking-linux-x86_64.md @@ -141,7 +141,7 @@ int main(int argc, const char* argv[]) { } ``` -```console +```bash > gcc -o main main.c -no-pie ``` @@ -209,7 +209,7 @@ To understand the `push 0` instruction in the **puts** trampoline we have to take a look at the third section of interest in the ELF file, the `.rela.plt` section. -```console +``` # -r print relocations # -D use .dynamic info when displaying info > readelf -W -r ./main @@ -250,7 +250,7 @@ The resulting index [2] is the offset into the dynamic symbol table (`.dynsym`). Dumping the dynamic symbol table with readelf we can see that the symbol at index [2] is **puts**. -```console +``` # -s print symbols > readelf -W -s ./main Symbol table '.dynsym' contains 7 entries: @@ -300,7 +300,7 @@ Following entries are most interesting for dynamic linking: We can use readelf to dump the `.dynamic` section. In the following snippet I only kept the relevant entries: -```console +``` # -d dump .dynamic section > readelf -d ./main diff --git a/content/2021-05-15-pthread_cancel-noexcept.md b/content/2021-05-15-pthread_cancel-noexcept.md index 4ff0fc2..f09cadc 100644 --- a/content/2021-05-15-pthread_cancel-noexcept.md +++ b/content/2021-05-15-pthread_cancel-noexcept.md @@ -8,7 +8,7 @@ tags = ["linux", "threading", "c++"] Few weeks ago I was debugging a random crash in a legacy code base at work. In case the crash occurred the following message was printed on `stdout` of the process: -```text +``` terminate called without an active exception ``` @@ -21,7 +21,7 @@ exception, the initial assumption was one of the following: After receiving a backtrace captured by a customer it wasn't directly obvious to me why `std::terminate()` was called here. The backtrace received looked something like the following: -```text +``` #0 0x00007fb21df22ef5 in raise () from /usr/lib/libc.so.6 #1 0x00007fb21df0c862 in abort () from /usr/lib/libc.so.6 #2 0x00007fb21e2a886a in __gnu_cxx::__verbose_terminate_handler () at /build/gcc/src/gcc/libstdc++-v3/libsupc++/vterminate.cc:95 diff --git a/content/2021-12-02-toying-with-virtio.md b/content/2021-12-02-toying-with-virtio.md index 56c34de..7aab8b6 100644 --- a/content/2021-12-02-toying-with-virtio.md +++ b/content/2021-12-02-toying-with-virtio.md @@ -199,7 +199,7 @@ set of limitations, for example With the guest, qemu and the host in the picture this looks something like the following. -```text +``` +--------------------------------------------+ | host | | +-------------------------+ | |