115 lines
4.0 KiB
Diff
115 lines
4.0 KiB
Diff
From a6ff69873110c0a8ba6f7fd90532dbc11224828c Mon Sep 17 00:00:00 2001
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From: Bruno Haible <bruno@clisp.org>
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Date: Sun, 13 Mar 2022 15:04:06 +0100
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Subject: [PATCH] Add support for Linux/PowerPC (32-bit) with musl libc.
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Reported by Khem Raj <raj.khem@gmail.com> in
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<https://lists.gnu.org/archive/html/m4-patches/2022-03/msg00000.html>.
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* autogen.sh: Copy also musl.m4.
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* configure.ac: Invoke gl_MUSL_LIBC.
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* src/fault-linux-powerpc.h (SIGSEGV_FAULT_STACKPOINTER): In the 32-bit
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case, handle musl libc differently.
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* NEWS: Mention it.
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Upstream: https://git.savannah.gnu.org/gitweb/?p=libsigsegv.git;a=commit;h=a6ff69873110c0a8ba6f7fd90532dbc11224828c
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Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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---
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ChangeLog | 11 +++++++++++
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NEWS | 4 ++++
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autogen.sh | 3 ++-
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configure.ac | 2 ++
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src/fault-linux-powerpc.h | 27 ++++++++++++++++++++++-----
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5 files changed, 41 insertions(+), 6 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index c52b227..7c0a8fa 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,14 @@
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+2022-03-13 Bruno Haible <bruno@clisp.org>
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+
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+ Add support for Linux/PowerPC (32-bit) with musl libc.
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+ Reported by Khem Raj <raj.khem@gmail.com> in
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+ <https://lists.gnu.org/archive/html/m4-patches/2022-03/msg00000.html>.
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+ * autogen.sh: Copy also musl.m4.
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+ * configure.ac: Invoke gl_MUSL_LIBC.
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+ * src/fault-linux-powerpc.h (SIGSEGV_FAULT_STACKPOINTER): In the 32-bit
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+ case, handle musl libc differently.
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+ * NEWS: Mention it.
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+
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2022-01-07 Bruno Haible <bruno@clisp.org>
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Prepare for version 2.14.
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diff --git a/NEWS b/NEWS
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index 4d012f8..82cc0f4 100644
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--- a/NEWS
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+++ b/NEWS
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@@ -1,3 +1,7 @@
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+New in 2.15:
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+
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+* Added support for Linux/PowerPC (32-bit) with musl libc.
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+
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New in 2.14:
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* Added support for 64-bit Cygwin.
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diff --git a/configure.ac b/configure.ac
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index e87f13b..164786f 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -75,6 +75,8 @@ AC_MSG_RESULT([$sv_cv_host])
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PLATFORM="$sv_cv_host"
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AC_SUBST([PLATFORM])
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+gl_MUSL_LIBC
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+
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dnl ========================== Done with PLATFORM ==========================
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diff --git a/src/fault-linux-powerpc.h b/src/fault-linux-powerpc.h
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index cba6ea7..b3f922a 100644
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--- a/src/fault-linux-powerpc.h
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+++ b/src/fault-linux-powerpc.h
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@@ -1,5 +1,5 @@
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/* Fault handler information. Linux/PowerPC version when it supports POSIX.
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- Copyright (C) 2002, 2009, 2017 Bruno Haible <bruno@clisp.org>
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+ Copyright (C) 2002, 2009, 2017, 2022 Bruno Haible <bruno@clisp.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@@ -28,10 +28,27 @@
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#if defined(__powerpc64__) || defined(_ARCH_PPC64) /* 64-bit */
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# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.gp_regs[1]
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#else /* 32-bit */
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-/* both should be equivalent */
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-# if 0
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-# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.regs->gpr[1]
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+# if MUSL_LIBC
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+/* musl libc has a different structure of ucontext_t in
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+ musl/arch/powerpc/bits/signal.h. */
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+/* The glibc comments say:
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+ "Different versions of the kernel have stored the registers on signal
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+ delivery at different offsets from the ucontext struct. Programs should
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+ thus use the uc_mcontext.uc_regs pointer to find where the registers are
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+ actually stored." */
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+# if 0
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+# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.gregs[1]
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+# else
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+# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_regs->gregs[1]
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+# endif
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# else
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-# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]
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+/* Assume the structure of ucontext_t in
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+ glibc/sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h. */
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+/* Because of the union, both definitions should be equivalent. */
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+# if 0
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+# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.regs->gpr[1]
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+# else
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+# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]
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+# endif
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# endif
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#endif
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--
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2.17.1
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