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-rw-r--r--sysdeps/unix/sysv/linux/bits/sigstksz.h33
-rw-r--r--sysdeps/unix/sysv/linux/ia64/sysconf-sigstksz.h27
-rw-r--r--sysdeps/unix/sysv/linux/sysconf-sigstksz.h38
-rw-r--r--sysdeps/unix/sysv/linux/sysconf.c9
-rw-r--r--sysdeps/unix/sysv/linux/x86/dl-minsigstacksize.h83
-rw-r--r--sysdeps/unix/sysv/linux/x86/include/bits/sigstack.h5
6 files changed, 195 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/bits/sigstksz.h b/sysdeps/unix/sysv/linux/bits/sigstksz.h
new file mode 100644
index 0000000..926508f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/sigstksz.h
@@ -0,0 +1,33 @@
+/* Definition of MINSIGSTKSZ and SIGSTKSZ. Linux version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _SIGNAL_H
+# error "Never include <bits/sigstksz.h> directly; use <signal.h> instead."
+#endif
+
+#if defined __USE_SC_SIGSTKSZ && __USE_SC_SIGSTKSZ
+# include <unistd.h>
+
+/* Default stack size for a signal handler: sysconf (SC_SIGSTKSZ). */
+# undef SIGSTKSZ
+# define SIGSTKSZ sysconf (_SC_SIGSTKSZ)
+
+/* Minimum stack size for a signal handler: SIGSTKSZ. */
+# undef MINSIGSTKSZ
+# define MINSIGSTKSZ SIGSTKSZ
+#endif
diff --git a/sysdeps/unix/sysv/linux/ia64/sysconf-sigstksz.h b/sysdeps/unix/sysv/linux/ia64/sysconf-sigstksz.h
new file mode 100644
index 0000000..7e5ceba
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/sysconf-sigstksz.h
@@ -0,0 +1,27 @@
+/* sysconf_sigstksz (). Linux/ia64 version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Return sysconf (_SC_SIGSTKSZ). */
+
+static long int
+sysconf_sigstksz (void)
+{
+ _Static_assert (__builtin_constant_p (SIGSTKSZ),
+ "SIGSTKSZ is constant");
+ return SIGSTKSZ;
+}
diff --git a/sysdeps/unix/sysv/linux/sysconf-sigstksz.h b/sysdeps/unix/sysv/linux/sysconf-sigstksz.h
new file mode 100644
index 0000000..64d450b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sysconf-sigstksz.h
@@ -0,0 +1,38 @@
+/* sysconf_sigstksz (). Linux version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Return sysconf (_SC_SIGSTKSZ). */
+
+static long int
+sysconf_sigstksz (void)
+{
+ long int minsigstacksize = GLRO(dl_minsigstacksize);
+ assert (minsigstacksize != 0);
+ _Static_assert (__builtin_constant_p (MINSIGSTKSZ),
+ "MINSIGSTKSZ is constant");
+ if (minsigstacksize < MINSIGSTKSZ)
+ minsigstacksize = MINSIGSTKSZ;
+ /* MAX (MINSIGSTKSZ, sysconf (_SC_MINSIGSTKSZ)) * 4. */
+ long int sigstacksize = minsigstacksize * 4;
+ /* Return MAX (SIGSTKSZ, sigstacksize). */
+ _Static_assert (__builtin_constant_p (SIGSTKSZ),
+ "SIGSTKSZ is constant");
+ if (sigstacksize < SIGSTKSZ)
+ sigstacksize = SIGSTKSZ;
+ return sigstacksize;
+}
diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c
index bfad5b6..366fcef 100644
--- a/sysdeps/unix/sysv/linux/sysconf.c
+++ b/sysdeps/unix/sysv/linux/sysconf.c
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
@@ -26,6 +27,7 @@
#include <sys/param.h>
#include <not-cancel.h>
#include <ldsodefs.h>
+#include <sysconf-sigstksz.h>
/* Legacy value of ARG_MAX. The macro is now not defined since the
actual value varies based on the stack size. */
@@ -75,6 +77,13 @@ __sysconf (int name)
}
break;
+ case _SC_MINSIGSTKSZ:
+ assert (GLRO(dl_minsigstacksize) != 0);
+ return GLRO(dl_minsigstacksize);
+
+ case _SC_SIGSTKSZ:
+ return sysconf_sigstksz ();
+
default:
break;
}
diff --git a/sysdeps/unix/sysv/linux/x86/dl-minsigstacksize.h b/sysdeps/unix/sysv/linux/x86/dl-minsigstacksize.h
new file mode 100644
index 0000000..6088bbc
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86/dl-minsigstacksize.h
@@ -0,0 +1,83 @@
+/* Emulate AT_MINSIGSTKSZ. Linux/x86 version.
+ Copyright (C) 2020 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Emulate AT_MINSIGSTKSZ with XSAVE. */
+
+static inline void
+dl_check_minsigstacksize (const struct cpu_features *cpu_features)
+{
+ /* Return if AT_MINSIGSTKSZ is provide by kernel. */
+ if (GLRO(dl_minsigstacksize) != 0)
+ return;
+
+ if (cpu_features->basic.max_cpuid >= 0xd
+ && CPU_FEATURES_CPU_P (cpu_features, OSXSAVE))
+ {
+ /* Emulate AT_MINSIGSTKSZ. In Linux kernel, the signal frame data
+ with XSAVE is composed of the following areas and laid out as:
+ ------------------------------
+ | alignment padding |
+ ------------------------------
+ | xsave buffer |
+ ------------------------------
+ | fsave header (32-bit only) |
+ ------------------------------
+ | siginfo + ucontext |
+ ------------------------------
+ */
+
+ unsigned int sigframe_size;
+
+#ifdef __x86_64__
+ /* NB: sizeof(struct rt_sigframe) + 8-byte return address in Linux
+ kernel. */
+ sigframe_size = 440 + 8;
+#else
+ /* NB: sizeof(struct sigframe_ia32) + sizeof(struct fregs_state)) +
+ 4-byte return address + 3 * 4-byte arguments in Linux kernel. */
+ sigframe_size = 736 + 112 + 4 + 3 * 4;
+#endif
+
+ /* Add 15 bytes to align the stack to 16 bytes. */
+ sigframe_size += 15;
+
+ /* Make the space before xsave buffer multiple of 16 bytes. */
+ sigframe_size = ALIGN_UP (sigframe_size, 16);
+
+ /* Add (64 - 16)-byte padding to align xsave buffer at 64 bytes. */
+ sigframe_size += 64 - 16;
+
+ unsigned int eax, ebx, ecx, edx;
+ __cpuid_count (0xd, 0, eax, ebx, ecx, edx);
+
+ /* Add the size of xsave buffer. */
+ sigframe_size += ebx;
+
+ /* Add the size of FP_XSTATE_MAGIC2. */
+#define FP_XSTATE_MAGIC2 0x46505845U
+ sigframe_size += sizeof (FP_XSTATE_MAGIC2);
+
+ GLRO(dl_minsigstacksize) = sigframe_size;
+ }
+ else
+ {
+ /* NB: Default to a constant MINSIGSTKSZ. */
+ _Static_assert (__builtin_constant_p (MINSIGSTKSZ),
+ "MINSIGSTKSZ is constant");
+ GLRO(dl_minsigstacksize) = MINSIGSTKSZ;
+ }
+}
diff --git a/sysdeps/unix/sysv/linux/x86/include/bits/sigstack.h b/sysdeps/unix/sysv/linux/x86/include/bits/sigstack.h
new file mode 100644
index 0000000..208754c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86/include/bits/sigstack.h
@@ -0,0 +1,5 @@
+#include_next <bits/sigstack.h>
+
+#ifndef _ISOMAC
+# define CONSTANT_MINSIGSTKSZ 0
+#endif
generated by cgit v1.1 at 2025-04-17 10:22:44 +0000