Patches for gdb on SerenityOS

0001-gdb-Disable-xmalloc-for-alternate_signal_stack-for-s.patch

gdb: Disable xmalloc for alternate_signal_stack for serenity

0002-serenity-Add-basic-ptrace-based-native-target-for-Se.patch

serenity: Add basic ptrace based native target for SerenityOS/i386

0003-gdb-Add-build-support-for-SerenityOS.patch

gdb: Add build support for SerenityOS

0004-serenity-Fix-compiler-fpermissive-warnings-from-usin.patch

serenity: Fix compiler -fpermissive warnings from using latest GCC

0005-serenity-Implement-custom-wait-override-for-the-sere.patch

serenity: Implement custom wait override for the serenity_nat_target

While troubleshooting why gdb wasn't working when attempting to debug serenity programs I noticed two things:

• The contract of serenity's waitpid(..) appears to be slightly different than the generic ptrace target expects. We need to make sure we pass WSTOPPED, and it can return different errno values that we would want to re-try on.

• The contract of serenity's ptrace(..) implementation appears to diverge as well, as we are expected to call PT_ATTACH before we call PT_CONTINUE, otherwise ptrace(..) will just error out.

Allow gdb to understand these differences, I've overloaded the serenity_nat_target::wait(..) method and added the logic there.

0006-serenity-Implement-mourn_inferior-override-for-the-s.patch

serenity: Implement mourn_inferior override for the serenity_nat_target

We need to pass WNOHANG to our waitpid(..) call on SerenityOS, otherwise we will wait forever.