Date: Thu, 20 May 2021 05:59:48 +0300 From: "Dmitry V. Levin" <ldv@...linux.org> To: Nicholas Piggin <npiggin@...il.com> Cc: Rich Felker <dalias@...c.org>, Joakim Tjernlund <Joakim.Tjernlund@...inera.com>, linux-api@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Michael Ellerman <mpe@...erman.id.au>, musl@...ts.openwall.com, Segher Boessenkool <segher@...nel.crashing.org> Subject: Re: Linux powerpc new system call instruction and ABI On Thu, May 20, 2021 at 12:45:57PM +1000, Nicholas Piggin wrote: > Excerpts from Dmitry V. Levin's message of May 20, 2021 11:06 am: > > On Wed, May 19, 2021 at 07:48:47PM -0400, Rich Felker wrote: > >> On Wed, May 19, 2021 at 06:09:25PM +0000, Joakim Tjernlund wrote: > > [...] > >> > W.r.t breaking ABI, isn't that what PowerPC is trying to do with the new syscall I/F? > >> > >> No, it's a new independent interface. > > > > Unfortunately, being a new independent interface doesn't mean it isn't > > an ABI break. In fact, it was a severe ABI break, and this thread is > > an attempt to find a hotfix. > > It is an ABI break, that was known. The ptrace info stuff I fixed with > the patch earlier was obviously a bug in my initial implementation and > not intended (sorry my ptrace testing was not sufficient, and thanks for > reporting it, by the way). Could you check whether tools/testing/selftests/ptrace/get_syscall_info.c passes again with your fix, please? If yes, then PTRACE_GET_SYSCALL_INFO is fixed. By the way, kernel tracing and audit subsystems also use those functions from asm/syscall.h and asm/ptrace.h, so your ptrace fix is likely to fix these subsystems as well. -- ldv
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