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97 lines
3.3 KiB
97 lines
3.3 KiB
7 years ago
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#
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# Upstream power patch to increase MINSIGSTKSZ and SIGSTKSZ to
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# account for the kernel signal frame size increase.
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#
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# commit f7c399cff5bd04ee9dc117fb6b0f39597dc047c6
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# Author: Alan Modra <amodra@gmail.com>
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# Date: Sat Aug 17 18:37:18 2013 +0930
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#
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# PowerPC SIGSTKSZ
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# http://sourceware.org/ml/libc-alpha/2013-08/msg00093.html
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#
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# This copies the sparc version of sigstack.h, which gives powerpc
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# #define MINSIGSTKSZ 4096
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# #define SIGSTKSZ 16384
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#
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# Before the VSX changes, struct rt_sigframe size was 1920 plus 128 for
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# __SIGNAL_FRAMESIZE giving ppc64 exactly the default MINSIGSTKSZ of
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# 2048.
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#
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# After VSX, ucontext increased by 256 bytes. Oops, we're over
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# MINSIGSTKSZ, so powerpc has been using the wrong value for quite a
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# while. Add another ucontext for TM and rt_sigframe is now at 3872,
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# giving actual MINSIGSTKSZ of 4000.
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#
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# The glibc testcase that I was looking at was tst-cancel21, which
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# allocates 2*SIGSTKSZ (not because the test is trying to be
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# conservative, but because the test actually has nested signal stack
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# frames). We blew the allocation by 48 bytes when using current
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# mainline gcc to compile glibc (le ppc64).
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#
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# The required stack depth in _dl_lookup_symbol_x from the top of the
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# next signal frame was 10944 bytes. I guess you'd want to add 288 to
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# that, implying an actual SIGSTKSZ of 11232.
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#
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# * sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h: New file.
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#
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diff --git glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h
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new file mode 100644
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index 0000000..33be9e8
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--- /dev/null
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+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h
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@@ -0,0 +1,54 @@
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+/* sigstack, sigaltstack definitions.
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+ Copyright (C) 1998-2013 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef _SIGNAL_H
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+# error "Never include this file directly. Use <signal.h> instead"
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+#endif
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+
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+
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+/* Structure describing a signal stack (obsolete). */
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+struct sigstack
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+ {
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+ void *ss_sp; /* Signal stack pointer. */
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+ int ss_onstack; /* Nonzero if executing on this stack. */
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+ };
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+
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+
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+/* Possible values for `ss_flags.'. */
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+enum
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+{
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+ SS_ONSTACK = 1,
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+#define SS_ONSTACK SS_ONSTACK
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+ SS_DISABLE
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+#define SS_DISABLE SS_DISABLE
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+};
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+
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+/* Minimum stack size for a signal handler. */
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+#define MINSIGSTKSZ 4096
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+
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+/* System default stack size. */
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+#define SIGSTKSZ 16384
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+
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+
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+/* Alternate, preferred interface. */
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+typedef struct sigaltstack
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+ {
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+ void *ss_sp;
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+ int ss_flags;
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+ size_t ss_size;
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+ } stack_t;
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