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[PATCH v2 11/15] RISC-V: Linux ABI
- From: Palmer Dabbelt <palmer at dabbelt dot com>
- To: libc-alpha at sourceware dot org
- Cc: Andrew Waterman <andrew at sifive dot com>, Darius Rad <darius at bluespec dot com>, dj at redhat dot com, Palmer Dabbelt <palmer at dabbelt dot com>
- Date: Tue, 19 Dec 2017 23:20:18 -0800
- Subject: [PATCH v2 11/15] RISC-V: Linux ABI
- Authentication-results: sourceware.org; auth=none
- References: <20171220072022.26909-1-palmer@dabbelt.com>
Linux-specific code that is required for maintaining ABI compatibility.
This doesn't contain the actual system call interface, that is split out
in order to avoid having a patch that's too big.
---
sysdeps/riscv/nptl/pthread-offsets.h | 24 ++++
sysdeps/riscv/nptl/pthreaddef.h | 32 +++++
sysdeps/unix/sysv/linux/riscv/____longjmp_chk.S | 2 +
sysdeps/unix/sysv/linux/riscv/bits/fcntl.h | 62 ++++++++++
sysdeps/unix/sysv/linux/riscv/bits/mman.h | 36 ++++++
sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h | 32 +++++
sysdeps/unix/sysv/linux/riscv/flush-icache.c | 61 ++++++++++
sysdeps/unix/sysv/linux/riscv/getcontext.S | 77 ++++++++++++
sysdeps/unix/sysv/linux/riscv/init-first.c | 56 +++++++++
sysdeps/unix/sysv/linux/riscv/libc-vdso.h | 38 ++++++
sysdeps/unix/sysv/linux/riscv/libthread_db.abilist | 41 +++++++
sysdeps/unix/sysv/linux/riscv/makecontext.c | 71 ++++++++++++
sysdeps/unix/sysv/linux/riscv/register-dump.h | 63 ++++++++++
.../unix/sysv/linux/riscv/rv32/jmp_buf-macros.h | 53 +++++++++
.../unix/sysv/linux/riscv/rv64/jmp_buf-macros.h | 53 +++++++++
sysdeps/unix/sysv/linux/riscv/setcontext.S | 114 ++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h | 28 +++++
sysdeps/unix/sysv/linux/riscv/swapcontext.S | 125 ++++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/sys/cachectl.h | 31 +++++
sysdeps/unix/sysv/linux/riscv/sys/procfs.h | 111 ++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/sys/ucontext.h | 126 ++++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/sys/user.h | 2 +
sysdeps/unix/sysv/linux/riscv/sysdep-cancel.h | 129 +++++++++++++++++++++
sysdeps/unix/sysv/linux/riscv/ucontext-macros.h | 49 ++++++++
sysdeps/unix/sysv/linux/riscv/ucontext_i.sym | 31 +++++
25 files changed, 1447 insertions(+)
create mode 100644 sysdeps/riscv/nptl/pthread-offsets.h
create mode 100644 sysdeps/riscv/nptl/pthreaddef.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/____longjmp_chk.S
create mode 100644 sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/bits/mman.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/flush-icache.c
create mode 100644 sysdeps/unix/sysv/linux/riscv/getcontext.S
create mode 100644 sysdeps/unix/sysv/linux/riscv/init-first.c
create mode 100644 sysdeps/unix/sysv/linux/riscv/libc-vdso.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/libthread_db.abilist
create mode 100644 sysdeps/unix/sysv/linux/riscv/makecontext.c
create mode 100644 sysdeps/unix/sysv/linux/riscv/register-dump.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/rv32/jmp_buf-macros.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/setcontext.S
create mode 100644 sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/swapcontext.S
create mode 100644 sysdeps/unix/sysv/linux/riscv/sys/cachectl.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/sys/procfs.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/sys/ucontext.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/sys/user.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/sysdep-cancel.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/ucontext-macros.h
create mode 100644 sysdeps/unix/sysv/linux/riscv/ucontext_i.sym
diff --git a/sysdeps/riscv/nptl/pthread-offsets.h b/sysdeps/riscv/nptl/pthread-offsets.h
new file mode 100644
index 000000000000..940f496b37e2
--- /dev/null
+++ b/sysdeps/riscv/nptl/pthread-offsets.h
@@ -0,0 +1,24 @@
+/* RISC-V pthread offsets
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#define __PTHREAD_MUTEX_NUSERS_OFFSET 12
+#define __PTHREAD_MUTEX_KIND_OFFSET 16
+#define __PTHREAD_MUTEX_SPINS_OFFSET 20
+#define __PTHREAD_MUTEX_ELISION_OFFSET 22
+#define __PTHREAD_MUTEX_LIST_OFFSET 24
diff --git a/sysdeps/riscv/nptl/pthreaddef.h b/sysdeps/riscv/nptl/pthreaddef.h
new file mode 100644
index 000000000000..4919be835c63
--- /dev/null
+++ b/sysdeps/riscv/nptl/pthreaddef.h
@@ -0,0 +1,32 @@
+/* pthread machine parameter definitions, RISC-V version.
+ Copyright (C) 2011-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+/* Default stack size. */
+#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024)
+
+/* Required stack pointer alignment at beginning. */
+#define STACK_ALIGN 16
+
+/* Minimal stack size after allocating thread descriptor and guard size. */
+#define MINIMAL_REST_STACK 2048
+
+/* Alignment requirement for TCB. */
+#define TCB_ALIGNMENT 16
+
+/* Location of current stack frame. */
+#define CURRENT_STACK_FRAME __builtin_frame_address (0)
diff --git a/sysdeps/unix/sysv/linux/riscv/____longjmp_chk.S b/sysdeps/unix/sysv/linux/riscv/____longjmp_chk.S
new file mode 100644
index 000000000000..e903c7e0df2a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/____longjmp_chk.S
@@ -0,0 +1,2 @@
+#define __longjmp ____longjmp_chk
+#include <__longjmp.S>
diff --git a/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h b/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
new file mode 100644
index 000000000000..d8cd045319b1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
@@ -0,0 +1,62 @@
+/* O_*, F_*, FD_* bit values for Linux / RISC-V.
+ Copyright (C) 2011-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _FCNTL_H
+# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
+#endif
+
+#include <bits/wordsize.h>
+
+/* In 64-bit ISA files are always with 64bit off_t and F_*LK64 are the same as
+ * non-64-bit versions. It will need to be revised for 128-bit. */
+#if __WORDSIZE == 64
+# define __O_LARGEFILE 0
+
+# define F_GETLK64 5 /* Get record locking info. */
+# define F_SETLK64 6 /* Set record locking info (non-blocking). */
+# define F_SETLKW64 7 /* Set record locking info (blocking). */
+#endif
+
+struct flock
+ {
+ short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
+ short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
+#if __WORDSIZE == 64 || !defined __USE_FILE_OFFSET64
+ __off_t l_start; /* Offset where the lock begins. */
+ __off_t l_len; /* Size of the locked area; zero means until EOF. */
+#else
+ __off64_t l_start; /* Offset where the lock begins. */
+ __off64_t l_len; /* Size of the locked area; zero means until EOF. */
+#endif
+ __pid_t l_pid; /* Process holding the lock. */
+ };
+
+#ifdef __USE_LARGEFILE64
+struct flock64
+ {
+ short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
+ short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
+ __off64_t l_start; /* Offset where the lock begins. */
+ __off64_t l_len; /* Size of the locked area; zero means until EOF. */
+ __pid_t l_pid; /* Process holding the lock. */
+ };
+#endif
+
+/* Include generic Linux declarations. */
+#include <bits/fcntl-linux.h>
diff --git a/sysdeps/unix/sysv/linux/riscv/bits/mman.h b/sysdeps/unix/sysv/linux/riscv/bits/mman.h
new file mode 100644
index 000000000000..92d3e136aaf1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/bits/mman.h
@@ -0,0 +1,36 @@
+/* Definitions for POSIX memory map interface. Linux/RISC-V version.
+ Copyright (C) 1997-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
+#endif
+
+#ifdef __USE_MISC
+# define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */
+# define MAP_DENYWRITE 0x00800 /* ETXTBSY */
+# define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */
+# define MAP_LOCKED 0x02000 /* Lock the mapping. */
+# define MAP_NORESERVE 0x04000 /* Don't check for reservations. */
+# define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */
+# define MAP_NONBLOCK 0x10000 /* Do not block on IO. */
+# define MAP_STACK 0x20000 /* Allocation is for a stack. */
+# define MAP_HUGETLB 0x40000 /* Create huge page mapping. */
+#endif
+
+/* Include generic Linux declarations. */
+#include <bits/mman-linux.h>
diff --git a/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h b/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
new file mode 100644
index 000000000000..0f760244f9fe
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
@@ -0,0 +1,32 @@
+/* Machine-dependent signal context structure for Linux. RISC-V version.
+ Copyright (C) 1996-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _BITS_SIGCONTEXT_H
+#define _BITS_SIGCONTEXT_H 1
+
+#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
+# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
+#endif
+
+struct sigcontext {
+ /* gregs[0] holds the program counter. */
+ unsigned long gregs[32];
+ unsigned long long fpregs[66] __attribute__((aligned(16)));
+};
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
new file mode 100644
index 000000000000..de2baa1eb5a5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -0,0 +1,61 @@
+/* RISC-V instruction cache flushing VDSO calls
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <dl-vdso.h>
+#include <stdlib.h>
+#include <atomic.h>
+#include <sys/cachectl.h>
+
+typedef int (*func_type) (void *, void *, unsigned long);
+
+static func_type
+__lookup_riscv_flush_icache (void)
+{
+ PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
+
+ func_type func = _dl_vdso_vsym ("__vdso_flush_icache", &linux_version);
+
+ /* The vDSO is required, as there is no exposed system call equivalent. */
+ if (!func)
+ abort ();
+
+ return func;
+}
+
+#ifdef SHARED
+
+#define INIT_ARCH()
+libc_ifunc (__riscv_flush_icache, __lookup_riscv_flush_icache ())
+
+#else
+
+int
+__riscv_flush_icache (void *start, void *end, unsigned long flags)
+{
+ static volatile func_type cached_func;
+
+ func_type func = cached_func;
+
+ if (!func)
+ cached_func = func = __lookup_riscv_flush_icache ();
+
+ return func (start, end, flags);
+}
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/getcontext.S b/sysdeps/unix/sysv/linux/riscv/getcontext.S
new file mode 100644
index 000000000000..0203ce49c2eb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/getcontext.S
@@ -0,0 +1,77 @@
+/* Save current context.
+ Copyright (C) 2009-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include "ucontext-macros.h"
+
+/* int getcontext (ucontext_t *ucp) */
+
+ .text
+LEAF (__getcontext)
+ SAVE_INT_REG (ra, 0, a0)
+ SAVE_INT_REG (ra, 1, a0)
+ SAVE_INT_REG (sp, 2, a0)
+ SAVE_INT_REG (s0, 8, a0)
+ SAVE_INT_REG (s1, 9, a0)
+ SAVE_INT_REG (x0, 10, a0) /* return 0 */
+ SAVE_INT_REG (s2, 18, a0)
+ SAVE_INT_REG (s3, 19, a0)
+ SAVE_INT_REG (s4, 20, a0)
+ SAVE_INT_REG (s5, 21, a0)
+ SAVE_INT_REG (s6, 22, a0)
+ SAVE_INT_REG (s7, 23, a0)
+ SAVE_INT_REG (s8, 24, a0)
+ SAVE_INT_REG (s9, 25, a0)
+ SAVE_INT_REG (s10, 26, a0)
+ SAVE_INT_REG (s11, 27, a0)
+
+#ifndef __riscv_float_abi_soft
+ frsr a1
+
+ SAVE_FP_REG (fs0, 8, a0)
+ SAVE_FP_REG (fs1, 9, a0)
+ SAVE_FP_REG (fs2, 18, a0)
+ SAVE_FP_REG (fs3, 19, a0)
+ SAVE_FP_REG (fs4, 20, a0)
+ SAVE_FP_REG (fs5, 21, a0)
+ SAVE_FP_REG (fs6, 22, a0)
+ SAVE_FP_REG (fs7, 23, a0)
+ SAVE_FP_REG (fs8, 24, a0)
+ SAVE_FP_REG (fs9, 25, a0)
+ SAVE_FP_REG (fs10, 26, a0)
+ SAVE_FP_REG (fs11, 27, a0)
+
+ sw a1, MCONTEXT_FSR(a0)
+#endif /* __riscv_float_abi_soft */
+
+/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
+ li a3, _NSIG8
+ add a2, a0, UCONTEXT_SIGMASK
+ mv a1, zero
+ li a0, SIG_BLOCK
+
+ li a7, SYS_ify (rt_sigprocmask)
+ scall
+ bltz a0, 99f
+
+ ret
+
+99: j __syscall_error
+
+PSEUDO_END (__getcontext)
+
+weak_alias (__getcontext, getcontext)
diff --git a/sysdeps/unix/sysv/linux/riscv/init-first.c b/sysdeps/unix/sysv/linux/riscv/init-first.c
new file mode 100644
index 000000000000..69deefd030e6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/init-first.c
@@ -0,0 +1,56 @@
+/* RISC-V VDSO initialization
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifdef SHARED
+# include <dl-vdso.h>
+# include <libc-vdso.h>
+
+long (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *) attribute_hidden;
+long (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *) attribute_hidden;
+long (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
+ attribute_hidden;
+long (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
+ attribute_hidden;
+
+static inline void
+_libc_vdso_platform_setup (void)
+{
+ PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
+
+ void *p = _dl_vdso_vsym ("__vdso_getcpu", &linux_version);
+ PTR_MANGLE (p);
+ VDSO_SYMBOL(getcpu) = p;
+
+ p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux_version);
+ PTR_MANGLE (p);
+ VDSO_SYMBOL(gettimeofday) = p;
+
+ p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux_version);
+ PTR_MANGLE (p);
+ VDSO_SYMBOL(clock_gettime) = p;
+
+ p = _dl_vdso_vsym ("__vdso_clock_getres", &linux_version);
+ PTR_MANGLE (p);
+ VDSO_SYMBOL(clock_getres) = p;
+}
+
+# define VDSO_SETUP _libc_vdso_platform_setup
+#endif
+
+#include <csu/init-first.c>
diff --git a/sysdeps/unix/sysv/linux/riscv/libc-vdso.h b/sysdeps/unix/sysv/linux/riscv/libc-vdso.h
new file mode 100644
index 000000000000..dc7f5edb186e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/libc-vdso.h
@@ -0,0 +1,38 @@
+/* RISC-V VDSO function declarations
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _LIBC_VDSO_H
+#define _LIBC_VDSO_H
+
+#ifdef SHARED
+
+# include <sysdep-vdso.h>
+
+extern long (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
+ attribute_hidden;
+extern long (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
+ attribute_hidden;
+extern long (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
+ attribute_hidden;
+extern long (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
+ attribute_hidden;
+
+#endif
+
+#endif /* _LIBC_VDSO_H */
diff --git a/sysdeps/unix/sysv/linux/riscv/libthread_db.abilist b/sysdeps/unix/sysv/linux/riscv/libthread_db.abilist
new file mode 100644
index 000000000000..3d34d7834f15
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/libthread_db.abilist
@@ -0,0 +1,41 @@
+GLIBC_2.27 GLIBC_2.27 A
+GLIBC_2.27 td_init F
+GLIBC_2.27 td_log F
+GLIBC_2.27 td_symbol_list F
+GLIBC_2.27 td_ta_clear_event F
+GLIBC_2.27 td_ta_delete F
+GLIBC_2.27 td_ta_enable_stats F
+GLIBC_2.27 td_ta_event_addr F
+GLIBC_2.27 td_ta_event_getmsg F
+GLIBC_2.27 td_ta_get_nthreads F
+GLIBC_2.27 td_ta_get_ph F
+GLIBC_2.27 td_ta_get_stats F
+GLIBC_2.27 td_ta_map_id2thr F
+GLIBC_2.27 td_ta_map_lwp2thr F
+GLIBC_2.27 td_ta_new F
+GLIBC_2.27 td_ta_reset_stats F
+GLIBC_2.27 td_ta_set_event F
+GLIBC_2.27 td_ta_setconcurrency F
+GLIBC_2.27 td_ta_thr_iter F
+GLIBC_2.27 td_ta_tsd_iter F
+GLIBC_2.27 td_thr_clear_event F
+GLIBC_2.27 td_thr_dbresume F
+GLIBC_2.27 td_thr_dbsuspend F
+GLIBC_2.27 td_thr_event_enable F
+GLIBC_2.27 td_thr_event_getmsg F
+GLIBC_2.27 td_thr_get_info F
+GLIBC_2.27 td_thr_getfpregs F
+GLIBC_2.27 td_thr_getgregs F
+GLIBC_2.27 td_thr_getxregs F
+GLIBC_2.27 td_thr_getxregsize F
+GLIBC_2.27 td_thr_set_event F
+GLIBC_2.27 td_thr_setfpregs F
+GLIBC_2.27 td_thr_setgregs F
+GLIBC_2.27 td_thr_setprio F
+GLIBC_2.27 td_thr_setsigpending F
+GLIBC_2.27 td_thr_setxregs F
+GLIBC_2.27 td_thr_sigsetmask F
+GLIBC_2.27 td_thr_tls_get_addr F
+GLIBC_2.27 td_thr_tlsbase F
+GLIBC_2.27 td_thr_tsd F
+GLIBC_2.27 td_thr_validate F
diff --git a/sysdeps/unix/sysv/linux/riscv/makecontext.c b/sysdeps/unix/sysv/linux/riscv/makecontext.c
new file mode 100644
index 000000000000..ba393aad3bfe
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/makecontext.c
@@ -0,0 +1,71 @@
+/* Create new context. RISC-V version.
+ Copyright (C) 2001-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+#include <sys/ucontext.h>
+#include <stdarg.h>
+#include <assert.h>
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc,
+ long a0, long a1, long a2, long a3, long a4, ...)
+{
+ extern void __start_context (void) attribute_hidden;
+ long i, sp;
+
+ _Static_assert (REG_NARGS == 8, "__makecontext assumes 8 argument registers");
+
+ /* Set up the stack. */
+ sp = ((long)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ALMASK;
+
+ /* Set up the register context.
+ ra = s0 = 0, terminating the stack for backtracing purposes.
+ s1 = the function we must call.
+ s2 = the subsequent context to run. */
+ ucp->uc_mcontext.gregs.byindex[REG_RA] = 0;
+ ucp->uc_mcontext.gregs.byindex[REG_S0 + 0] = 0;
+ ucp->uc_mcontext.gregs.byindex[REG_S0 + 1] = (long)func;
+ ucp->uc_mcontext.gregs.byindex[REG_S0 + 2] = (long)ucp->uc_link;
+ ucp->uc_mcontext.gregs.byindex[REG_SP] = sp;
+ ucp->uc_mcontext.gregs.byindex[REG_PC] = (long)&__start_context;
+
+ /* Put args in a0-a7, then put any remaining args on the stack. */
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + 0] = a0;
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + 1] = a1;
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + 2] = a2;
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + 3] = a3;
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + 4] = a4;
+
+ if (__builtin_expect (argc > 5, 0))
+ {
+ va_list vl;
+ va_start (vl, a4);
+
+ long reg_args = argc < REG_NARGS ? argc : REG_NARGS;
+ sp = (sp - (argc - reg_args) * sizeof (long)) & ALMASK;
+ for (i = 5; i < reg_args; i++)
+ ucp->uc_mcontext.gregs.byindex[REG_A0 + i] = va_arg (vl, long);
+ for (i = 0; i < argc - reg_args; i++)
+ ((long*)sp)[i] = va_arg (vl, long);
+
+ va_end (vl);
+ }
+}
+
+weak_alias (__makecontext, makecontext)
diff --git a/sysdeps/unix/sysv/linux/riscv/register-dump.h b/sysdeps/unix/sysv/linux/riscv/register-dump.h
new file mode 100644
index 000000000000..e5c53f920fba
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/register-dump.h
@@ -0,0 +1,63 @@
+/* Dump registers.
+ Copyright (C) 2000-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <unistd.h>
+#include <string.h>
+#include <_itoa.h>
+
+static void
+hexvalue (unsigned long int value, char *buf, size_t len)
+{
+ char *cp = _itoa_word (value, buf + len, 16, 0);
+ while (cp > buf)
+ *--cp = '0';
+}
+
+#define REGDUMP_NREGS 32
+#define REGDUMP_PER_LINE (80 / (__WORDSIZE/4 + 4))
+
+static void
+register_dump (int fd, ucontext_t *ctx)
+{
+ int i;
+ char regvalue[__WORDSIZE/4 + 1];
+ char str[82 * ((REGDUMP_NREGS + REGDUMP_PER_LINE - 1) / REGDUMP_PER_LINE)];
+
+ static const char names[REGDUMP_NREGS][4] = {
+ "pc", "ra", "sp", "gp", "tp", "t0", "t1", "t2",
+ "s0", "s1", "a0", "a1", "a2", "a3", "a4", "a5",
+ "a6", "a7", "s2", "s3", "s4", "s5", "s6", "s7",
+ "s8", "s9", "sA", "sB", "t3", "t4", "t5", "t6"
+ };
+
+ str[0] = 0;
+ for (i = 0; i < REGDUMP_NREGS; i++)
+ {
+ strcat (str, names[i]);
+ strcat (str, " ");
+ hexvalue (ctx->uc_mcontext.gregs.byindex[i], regvalue, __WORDSIZE/4);
+ strcat (str, regvalue);
+
+ if ((i + 1) % REGDUMP_PER_LINE == 0)
+ strcat (str, "\n");
+ }
+
+ write (fd, str, strlen (str));
+}
+
+#define REGISTER_DUMP register_dump (fd, ctx)
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/jmp_buf-macros.h b/sysdeps/unix/sysv/linux/riscv/rv32/jmp_buf-macros.h
new file mode 100644
index 000000000000..dba7d27c0910
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/jmp_buf-macros.h
@@ -0,0 +1,53 @@
+/* jump buffer constants for RISC-V
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+/* Produced by this program:
+
+ #include <stdio.h>
+ #include <unistd.h>
+ #include <setjmp.h>
+ #include <stddef.h>
+
+ int main(int argc, char **argv)
+ {
+ printf("#define JMP_BUF_SIZE %d\n", sizeof(jmp_buf));
+ printf("#define JMP_BUF_ALIGN %d\n", __alignof__(jmp_buf));
+ printf("#define SIGJMP_BUF_SIZE %d\n", sizeof(sigjmp_buf));
+ printf("#define SIGJMP_BUF_ALIGN %d\n", __alignof__(sigjmp_buf));
+ printf("#define MASK_WAS_SAVED_OFFSET %d\n", offsetof(struct __jmp_buf_tag, __mask_was_saved));
+ printf("#define SAVED_MASK_OFFSET %d\n", offsetof(struct __jmp_buf_tag, __saved_mask));
+ } */
+
+#if defined(__riscv_float_abi_soft)
+# define JMP_BUF_SIZE 188
+# define JMP_BUF_ALIGN 4
+# define SIGJMP_BUF_SIZE 188
+# define SIGJMP_BUF_ALIGN 4
+# define MASK_WAS_SAVED_OFFSET 56
+# define SAVED_MASK_OFFSET 60
+#elif defined(__riscv_float_abi_double)
+# define JMP_BUF_SIZE 288
+# define JMP_BUF_ALIGN 8
+# define SIGJMP_BUF_SIZE 288
+# define SIGJMP_BUF_ALIGN 8
+# define MASK_WAS_SAVED_OFFSET 152
+# define SAVED_MASK_OFFSET 156
+#else
+# error "Unknown RISC-V floating-point ABI"
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h b/sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h
new file mode 100644
index 000000000000..67d6ff85803f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h
@@ -0,0 +1,53 @@
+/* jump buffer constants for RISC-V
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+/* Produced by this program:
+
+ #include <stdio.h>
+ #include <unistd.h>
+ #include <setjmp.h>
+ #include <stddef.h>
+
+ int main(int argc, char **argv)
+ {
+ printf("#define JMP_BUF_SIZE %d\n", sizeof(jmp_buf));
+ printf("#define JMP_BUF_ALIGN %d\n", __alignof__(jmp_buf));
+ printf("#define SIGJMP_BUF_SIZE %d\n", sizeof(sigjmp_buf));
+ printf("#define SIGJMP_BUF_ALIGN %d\n", __alignof__(sigjmp_buf));
+ printf("#define MASK_WAS_SAVED_OFFSET %d\n", offsetof(struct __jmp_buf_tag, __mask_was_saved));
+ printf("#define SAVED_MASK_OFFSET %d\n", offsetof(struct __jmp_buf_tag, __saved_mask));
+ } */
+
+#if defined(__riscv_float_abi_soft)
+# define JMP_BUF_SIZE 248
+# define JMP_BUF_ALIGN 8
+# define SIGJMP_BUF_SIZE 248
+# define SIGJMP_BUF_ALIGN 8
+# define MASK_WAS_SAVED_OFFSET 112
+# define SAVED_MASK_OFFSET 120
+#elif defined(__riscv_float_abi_double)
+# define JMP_BUF_SIZE 344
+# define JMP_BUF_ALIGN 8
+# define SIGJMP_BUF_SIZE 344
+# define SIGJMP_BUF_ALIGN 8
+# define MASK_WAS_SAVED_OFFSET 208
+# define SAVED_MASK_OFFSET 216
+#else
+# error "Unknown RISC-V floating-point ABI"
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/setcontext.S b/sysdeps/unix/sysv/linux/riscv/setcontext.S
new file mode 100644
index 000000000000..27c14dd9da3f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/setcontext.S
@@ -0,0 +1,114 @@
+/* Set current context.
+ Copyright (C) 2009-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include "ucontext-macros.h"
+
+/* int __setcontext (const ucontext_t *ucp)
+
+ Restores the machine context in UCP and thereby resumes execution
+ in that context.
+
+ This implementation is intended to be used for *synchronous* context
+ switches only. Therefore, it does not have to restore anything
+ other than the PRESERVED state. */
+
+ .text
+LEAF (__setcontext)
+
+ mv t0, a0 /* t0 <- ucp */
+
+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
+ li a3, _NSIG8
+ mv a2, zero
+ add a1, a0, UCONTEXT_SIGMASK
+ li a0, SIG_SETMASK
+
+ li a7, SYS_ify (rt_sigprocmask)
+ scall
+
+ bltz a0, 99f
+
+ cfi_def_cfa (t0, 0)
+
+#ifndef __riscv_float_abi_soft
+ lw t1, MCONTEXT_FSR(t0)
+
+ RESTORE_FP_REG_CFI (fs0, 8, t0)
+ RESTORE_FP_REG_CFI (fs1, 9, t0)
+ RESTORE_FP_REG_CFI (fs2, 18, t0)
+ RESTORE_FP_REG_CFI (fs3, 19, t0)
+ RESTORE_FP_REG_CFI (fs4, 20, t0)
+ RESTORE_FP_REG_CFI (fs5, 21, t0)
+ RESTORE_FP_REG_CFI (fs6, 22, t0)
+ RESTORE_FP_REG_CFI (fs7, 23, t0)
+ RESTORE_FP_REG_CFI (fs8, 24, t0)
+ RESTORE_FP_REG_CFI (fs9, 25, t0)
+ RESTORE_FP_REG_CFI (fs10, 26, t0)
+ RESTORE_FP_REG_CFI (fs11, 27, t0)
+
+ fssr t1
+#endif /* __riscv_float_abi_soft */
+
+ /* Note the contents of argument registers will be random
+ unless makecontext() has been called. */
+ RESTORE_INT_REG (t1, 0, t0)
+ RESTORE_INT_REG_CFI (ra, 1, t0)
+ RESTORE_INT_REG (sp, 2, t0)
+ RESTORE_INT_REG_CFI (s0, 8, t0)
+ RESTORE_INT_REG_CFI (s1, 9, t0)
+ RESTORE_INT_REG (a0, 10, t0)
+ RESTORE_INT_REG (a1, 11, t0)
+ RESTORE_INT_REG (a2, 12, t0)
+ RESTORE_INT_REG (a3, 13, t0)
+ RESTORE_INT_REG (a4, 14, t0)
+ RESTORE_INT_REG (a5, 15, t0)
+ RESTORE_INT_REG (a6, 16, t0)
+ RESTORE_INT_REG (a7, 17, t0)
+ RESTORE_INT_REG_CFI (s2, 18, t0)
+ RESTORE_INT_REG_CFI (s3, 19, t0)
+ RESTORE_INT_REG_CFI (s4, 20, t0)
+ RESTORE_INT_REG_CFI (s5, 21, t0)
+ RESTORE_INT_REG_CFI (s6, 22, t0)
+ RESTORE_INT_REG_CFI (s7, 23, t0)
+ RESTORE_INT_REG_CFI (s8, 24, t0)
+ RESTORE_INT_REG_CFI (s9, 25, t0)
+ RESTORE_INT_REG_CFI (s10, 26, t0)
+ RESTORE_INT_REG_CFI (s11, 27, t0)
+
+ jr t1
+
+99: j __syscall_error
+
+PSEUDO_END (__setcontext)
+weak_alias (__setcontext, setcontext)
+
+LEAF (__start_context)
+
+ /* Terminate call stack by noting ra == 0. Happily, s0 == 0 here. */
+ cfi_register (ra, s0)
+
+ /* Call the function passed to makecontext. */
+ jalr s1
+
+ /* Invoke subsequent context if present, else exit(0). */
+ mv a0, s2
+ beqz s2, 1f
+ jal __setcontext
+1: j exit
+
+PSEUDO_END (__start_context)
diff --git a/sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h b/sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h
new file mode 100644
index 000000000000..6db65eaa023e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h
@@ -0,0 +1,28 @@
+/* RISC-V definitions for signal handling calling conventions.
+ Copyright (C) 2000-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sys/ucontext.h>
+
+#define SIGCONTEXT siginfo_t *_si, ucontext_t *
+#define SIGCONTEXT_EXTRA_ARGS _si,
+#define GET_PC(ctx) ((void *) ctx->uc_mcontext.gregs.byindex[REG_PC])
+#define GET_FRAME(ctx) ((void *) ctx->uc_mcontext.gregs.byindex[REG_S0])
+#define GET_STACK(ctx) ((void *) ctx->uc_mcontext.gregs.byindex[REG_SP])
+
+#define CALL_SIGHANDLER(handler, signo, ctx) \
+ (handler)((signo), SIGCONTEXT_EXTRA_ARGS (ctx))
diff --git a/sysdeps/unix/sysv/linux/riscv/swapcontext.S b/sysdeps/unix/sysv/linux/riscv/swapcontext.S
new file mode 100644
index 000000000000..1cbb3dcf1bdc
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/swapcontext.S
@@ -0,0 +1,125 @@
+/* Save and set current context.
+ Copyright (C) 2009-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include "ucontext-macros.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+LEAF (__swapcontext)
+ mv t0, a1 /* t0 <- ucp */
+
+ SAVE_INT_REG (ra, 0, a0)
+ SAVE_INT_REG (ra, 1, a0)
+ SAVE_INT_REG (sp, 2, a0)
+ SAVE_INT_REG (s0, 8, a0)
+ SAVE_INT_REG (s1, 9, a0)
+ SAVE_INT_REG (x0, 10, a0) /* return 0 */
+ SAVE_INT_REG (s2, 18, a0)
+ SAVE_INT_REG (s3, 19, a0)
+ SAVE_INT_REG (s4, 20, a0)
+ SAVE_INT_REG (s5, 21, a0)
+ SAVE_INT_REG (s6, 22, a0)
+ SAVE_INT_REG (s7, 23, a0)
+ SAVE_INT_REG (s8, 24, a0)
+ SAVE_INT_REG (s9, 25, a0)
+ SAVE_INT_REG (s10, 26, a0)
+ SAVE_INT_REG (s11, 27, a0)
+
+#ifndef __riscv_float_abi_soft
+ frsr a1
+
+ SAVE_FP_REG (fs0, 8, a0)
+ SAVE_FP_REG (fs1, 9, a0)
+ SAVE_FP_REG (fs2, 18, a0)
+ SAVE_FP_REG (fs3, 19, a0)
+ SAVE_FP_REG (fs4, 20, a0)
+ SAVE_FP_REG (fs5, 21, a0)
+ SAVE_FP_REG (fs6, 22, a0)
+ SAVE_FP_REG (fs7, 23, a0)
+ SAVE_FP_REG (fs8, 24, a0)
+ SAVE_FP_REG (fs9, 25, a0)
+ SAVE_FP_REG (fs10, 26, a0)
+ SAVE_FP_REG (fs11, 27, a0)
+
+ sw a1, MCONTEXT_FSR(a0)
+#endif /* __riscv_float_abi_soft */
+
+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
+ li a3, _NSIG8
+ mv a2, zero
+ add a1, a0, UCONTEXT_SIGMASK
+ li a0, SIG_SETMASK
+
+ li a7, SYS_ify (rt_sigprocmask)
+ scall
+
+ bltz a0, 99f
+
+#ifndef __riscv_float_abi_soft
+ lw t1, MCONTEXT_FSR(t0)
+
+ RESTORE_FP_REG (fs0, 8, t0)
+ RESTORE_FP_REG (fs1, 9, t0)
+ RESTORE_FP_REG (fs2, 18, t0)
+ RESTORE_FP_REG (fs3, 19, t0)
+ RESTORE_FP_REG (fs4, 20, t0)
+ RESTORE_FP_REG (fs5, 21, t0)
+ RESTORE_FP_REG (fs6, 22, t0)
+ RESTORE_FP_REG (fs7, 23, t0)
+ RESTORE_FP_REG (fs8, 24, t0)
+ RESTORE_FP_REG (fs9, 25, t0)
+ RESTORE_FP_REG (fs10, 26, t0)
+ RESTORE_FP_REG (fs11, 27, t0)
+
+ fssr t1
+#endif /* __riscv_float_abi_soft */
+
+ /* Note the contents of argument registers will be random
+ unless makecontext() has been called. */
+ RESTORE_INT_REG (t1, 0, t0)
+ RESTORE_INT_REG (ra, 1, t0)
+ RESTORE_INT_REG (sp, 2, t0)
+ RESTORE_INT_REG (s0, 8, t0)
+ RESTORE_INT_REG (s1, 9, t0)
+ RESTORE_INT_REG (a0, 10, t0)
+ RESTORE_INT_REG (a1, 11, t0)
+ RESTORE_INT_REG (a2, 12, t0)
+ RESTORE_INT_REG (a3, 13, t0)
+ RESTORE_INT_REG (a4, 14, t0)
+ RESTORE_INT_REG (a5, 15, t0)
+ RESTORE_INT_REG (a6, 16, t0)
+ RESTORE_INT_REG (a7, 17, t0)
+ RESTORE_INT_REG (s2, 18, t0)
+ RESTORE_INT_REG (s3, 19, t0)
+ RESTORE_INT_REG (s4, 20, t0)
+ RESTORE_INT_REG (s5, 21, t0)
+ RESTORE_INT_REG (s6, 22, t0)
+ RESTORE_INT_REG (s7, 23, t0)
+ RESTORE_INT_REG (s8, 24, t0)
+ RESTORE_INT_REG (s9, 25, t0)
+ RESTORE_INT_REG (s10, 26, t0)
+ RESTORE_INT_REG (s11, 27, t0)
+
+ jr t1
+
+
+99: j __syscall_error
+
+PSEUDO_END (__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/sysdeps/unix/sysv/linux/riscv/sys/cachectl.h b/sysdeps/unix/sysv/linux/riscv/sys/cachectl.h
new file mode 100644
index 000000000000..6ba37cf7c93b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/cachectl.h
@@ -0,0 +1,31 @@
+/* RISC-V instruction cache flushing interface
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H 1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+extern int __riscv_flush_icache (void *start, void *end, unsigned long flags);
+
+__END_DECLS
+
+#endif /* sys/cachectl.h */
diff --git a/sysdeps/unix/sysv/linux/riscv/sys/procfs.h b/sysdeps/unix/sysv/linux/riscv/sys/procfs.h
new file mode 100644
index 000000000000..cf8fec0c354e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/procfs.h
@@ -0,0 +1,111 @@
+/* Core image file related definitions, RISC-V version.
+ Copyright (C) 1996-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_PROCFS_H
+#define _SYS_PROCFS_H 1
+
+/* This is somehow modelled after the file of the same name on SysVr4
+ systems. It provides a definition of the core file format for ELF
+ used on Linux. */
+
+#include <features.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/user.h>
+#include <sys/ucontext.h>
+
+/* ELF register definitions */
+#define ELF_NGREG NGREG
+#define ELF_NFPREG NFPREG
+
+typedef greg_t elf_greg_t;
+typedef gregset_t elf_gregset_t;
+typedef fpregset_t elf_fpregset_t;
+
+__BEGIN_DECLS
+
+struct elf_siginfo
+ {
+ int si_signo; /* Signal number. */
+ int si_code; /* Extra code. */
+ int si_errno; /* Errno. */
+ };
+
+
+/* Definitions to generate Intel SVR4-like core files. These mostly
+ have the same names as the SVR4 types with "elf_" tacked on the
+ front to prevent clashes with linux definitions, and the typedef
+ forms have been avoided. This is mostly like the SVR4 structure,
+ but more Linuxy, with things that Linux does not support and which
+ gdb doesn't really use excluded. Fields present but not used are
+ marked with "XXX". */
+struct elf_prstatus
+ {
+ struct elf_siginfo pr_info; /* Info associated with signal. */
+ short int pr_cursig; /* Current signal. */
+ unsigned long int pr_sigpend; /* Set of pending signals. */
+ unsigned long int pr_sighold; /* Set of held signals. */
+ __pid_t pr_pid;
+ __pid_t pr_ppid;
+ __pid_t pr_pgrp;
+ __pid_t pr_sid;
+ struct timeval pr_utime; /* User time. */
+ struct timeval pr_stime; /* System time. */
+ struct timeval pr_cutime; /* Cumulative user time. */
+ struct timeval pr_cstime; /* Cumulative system time. */
+ elf_gregset_t pr_reg; /* GP registers. */
+ int pr_fpvalid; /* True if math copro being used. */
+ };
+
+
+#define ELF_PRARGSZ (80) /* Number of chars for args */
+
+struct elf_prpsinfo
+ {
+ char pr_state; /* Numeric process state. */
+ char pr_sname; /* Char for pr_state. */
+ char pr_zomb; /* Zombie. */
+ char pr_nice; /* Nice val. */
+ unsigned long int pr_flag; /* Flags. */
+ long pr_uid;
+ long pr_gid;
+ int pr_pid, pr_ppid, pr_pgrp, pr_sid;
+ /* Lots missing */
+ char pr_fname[16]; /* Filename of executable. */
+ char pr_psargs[ELF_PRARGSZ]; /* Initial part of arg list. */
+ };
+
+
+/* Addresses. */
+typedef void *psaddr_t;
+
+/* Register sets. Linux has different names. */
+typedef elf_gregset_t prgregset_t;
+typedef elf_fpregset_t prfpregset_t;
+
+/* We don't have any differences between processes and threads,
+ therefore habe only ine PID type. */
+typedef __pid_t lwpid_t;
+
+
+typedef struct elf_prstatus prstatus_t;
+typedef struct elf_prpsinfo prpsinfo_t;
+
+__END_DECLS
+
+#endif /* sys/procfs.h */
diff --git a/sysdeps/unix/sysv/linux/riscv/sys/ucontext.h b/sysdeps/unix/sysv/linux/riscv/sys/ucontext.h
new file mode 100644
index 000000000000..0ab62b4c5f5e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/ucontext.h
@@ -0,0 +1,126 @@
+/* struct ucontext definition, RISC-V version.
+ Copyright (C) 1997-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+/* Don't rely on this, the interface is currently messed up and may need to
+ be broken to be fixed. */
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H 1
+
+#include <features.h>
+
+#include <bits/types/sigset_t.h>
+#include <bits/types/stack_t.h>
+#include <asm/ptrace.h>
+
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
+
+#ifdef __USE_MISC
+
+#define NGREG 32
+
+#define REG_PC 0
+#define REG_RA 1
+#define REG_SP 2
+#define REG_TP 4
+#define REG_S0 8
+#define REG_A0 10
+#define REG_NARGS 8
+
+typedef unsigned long greg_t;
+
+/* Container for all general registers. */
+typedef greg_t gregset_t[NGREG];
+
+/* Container for floating-point state. */
+typedef union __riscv_fp_state fpregset_t;
+
+#endif
+
+/* These structures all must match what's in Linux. Some are copied. */
+struct __riscv_gp_state {
+ unsigned long pc;
+ unsigned long ra;
+ unsigned long sp;
+ unsigned long gp;
+ unsigned long tp;
+ unsigned long t0;
+ unsigned long t1;
+ unsigned long t2;
+ unsigned long s0;
+ unsigned long s1;
+ unsigned long a0;
+ unsigned long a1;
+ unsigned long a2;
+ unsigned long a3;
+ unsigned long a4;
+ unsigned long a5;
+ unsigned long a6;
+ unsigned long a7;
+ unsigned long s2;
+ unsigned long s3;
+ unsigned long s4;
+ unsigned long s5;
+ unsigned long s6;
+ unsigned long s7;
+ unsigned long s8;
+ unsigned long s9;
+ unsigned long s10;
+ unsigned long s11;
+ unsigned long t3;
+ unsigned long t4;
+ unsigned long t5;
+ unsigned long t6;
+};
+
+typedef struct mcontext_t
+ {
+ union {
+ struct __riscv_gp_state byname;
+ unsigned long byindex[32];
+ } gregs;
+ union __riscv_fp_state fpregs;
+ } mcontext_t;
+
+/* Userlevel context. */
+typedef struct ucontext_t
+ {
+ unsigned long uc_flags;
+ struct ucontext *uc_link;
+ stack_t uc_stack;
+ sigset_t uc_sigmask;
+ /* There's some padding here to allow sigset_t to be expanded in the
+ * future. Though this is unlikely, other architectures put uc_sigmask
+ * at the end of this structure and explicitly state it can be
+ * expanded, so we didn't want to box ourselves in here. */
+ __u8 __unused[1024 / 8 - sizeof(sigset_t)];
+ /* We can't put uc_sigmask at the end of this structure because we need
+ * to be able to expand sigcontext in the future. For example, the
+ * vector ISA extension will almost certainly add ISA state. We want
+ * to ensure all user-visible ISA state can be saved and restored via a
+ * ucontext, so we're putting this at the end in order to allow for
+ * infinite extensibility. Since we know this will be extended and we
+ * assume sigset_t won't be extended an extreme amount, we're
+ * prioritizing this. */
+ mcontext_t uc_mcontext;
+ } ucontext_t;
+
+#endif /* sys/ucontext.h */
diff --git a/sysdeps/unix/sysv/linux/riscv/sys/user.h b/sysdeps/unix/sysv/linux/riscv/sys/user.h
new file mode 100644
index 000000000000..faf307936b1e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/user.h
@@ -0,0 +1,2 @@
+/* x86 puts "struct user_regs_struct" in here, this is just a shim. */
+#include <asm/ptrace.h>
diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep-cancel.h b/sysdeps/unix/sysv/linux/riscv/sysdep-cancel.h
new file mode 100644
index 000000000000..a2d4e2d15e15
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep-cancel.h
@@ -0,0 +1,129 @@
+/* Assembler macros with cancellation support, RISC-V version.
+ Copyright (C) 2003-2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sysdeps/generic/sysdep.h>
+#include <tls.h>
+#ifndef __ASSEMBLER__
+# include <nptl/pthreadP.h>
+#endif
+#include <sys/asm.h>
+
+/* Gas will put the initial save of $gp into the CIE, because it appears to
+ happen before any instructions. So we use cfi_same_value instead of
+ cfi_restore. */
+
+#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
+
+# undef PSEUDO
+# define PSEUDO(name, syscall_name, args) \
+ .align 2; \
+ L(pseudo_start): \
+ 99: j __syscall_error; \
+ ENTRY (name) \
+ SINGLE_THREAD_P(t0); \
+ bnez t0, L(pseudo_cancel); \
+ .type __##syscall_name##_nocancel, @function; \
+ .globl __##syscall_name##_nocancel; \
+ __##syscall_name##_nocancel: \
+ li a7, SYS_ify(syscall_name); \
+ scall; \
+ bltz a0, 99b; \
+ ret; \
+ .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
+ L(pseudo_cancel): \
+ addi sp, sp, -STKSPACE; \
+ REG_S ra, STKOFF_RA(sp); \
+ cfi_rel_offset (ra, STKOFF_RA); \
+ PUSHARGS_##args; /* save syscall args */ \
+ CENABLE; \
+ REG_S a0, STKOFF_SVMSK(sp); /* save mask */ \
+ POPARGS_##args; /* restore syscall args */ \
+ li a7, SYS_ify (syscall_name); \
+ scall; \
+ REG_S a0, STKOFF_A0(sp); /* save syscall result */ \
+ REG_L a0, STKOFF_SVMSK(sp); /* pass mask as arg1 */ \
+ CDISABLE; \
+ REG_L ra, STKOFF_RA(sp); /* restore return address */ \
+ REG_L a0, STKOFF_A0(sp); /* restore syscall result */ \
+ addi sp, sp, STKSPACE; \
+ bltz a0, 99b; \
+ L(pseudo_end):
+
+
+# define PUSHARGS_0 /* nothing to do */
+# define PUSHARGS_1 PUSHARGS_0 REG_S a0, STKOFF_A0(sp); cfi_rel_offset (a0, STKOFF_A0);
+# define PUSHARGS_2 PUSHARGS_1 REG_S a1, STKOFF_A1(sp); cfi_rel_offset (a1, STKOFF_A1);
+# define PUSHARGS_3 PUSHARGS_2 REG_S a2, STKOFF_A2(sp); cfi_rel_offset (a2, STKOFF_A2);
+# define PUSHARGS_4 PUSHARGS_3 REG_S a3, STKOFF_A3(sp); cfi_rel_offset (a3, STKOFF_A3);
+# define PUSHARGS_5 PUSHARGS_4 REG_S a4, STKOFF_A4(sp); cfi_rel_offset (a4, STKOFF_A4);
+# define PUSHARGS_6 PUSHARGS_5 REG_S a5, STKOFF_A5(sp); cfi_rel_offset (a5, STKOFF_A5);
+
+# define POPARGS_0 /* nothing to do */
+# define POPARGS_1 POPARGS_0 REG_L a0, STKOFF_A0(sp);
+# define POPARGS_2 POPARGS_1 REG_L a1, STKOFF_A1(sp);
+# define POPARGS_3 POPARGS_2 REG_L a2, STKOFF_A2(sp);
+# define POPARGS_4 POPARGS_3 REG_L a3, STKOFF_A3(sp);
+# define POPARGS_5 POPARGS_4 REG_L a4, STKOFF_A4(sp);
+# define POPARGS_6 POPARGS_5 REG_L a5, STKOFF_A5(sp);
+
+/* Avoid D$ misses by keeping less-used arguments further down stack. */
+# define STKOFF_A5 0
+# define STKOFF_A4 (STKOFF_A5 + SZREG)
+# define STKOFF_A3 (STKOFF_A4 + SZREG)
+# define STKOFF_A2 (STKOFF_A3 + SZREG)
+# define STKOFF_A1 (STKOFF_A2 + SZREG)
+# define STKOFF_A0 (STKOFF_A1 + SZREG)
+# define STKOFF_SVMSK (STKOFF_A0 + SZREG)
+# define STKOFF_RA (STKOFF_SVMSK + SZREG)
+# define STKSPACE (STKOFF_RA + SZREG)
+
+# if IS_IN (libpthread)
+# define CENABLE call __pthread_enable_asynccancel
+# define CDISABLE call __pthread_disable_asynccancel
+# elif IS_IN (librt)
+# define CENABLE call __librt_enable_asynccancel
+# define CDISABLE call __librt_disable_asynccancel
+# else
+# define CENABLE call __libc_enable_asynccancel
+# define CDISABLE call __libc_disable_asynccancel
+# endif
+
+# ifndef __ASSEMBLER__
+# define SINGLE_THREAD_P \
+ __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+ header.multiple_threads) \
+ == 0, 1)
+# else
+# include "tcb-offsets.h"
+# define SINGLE_THREAD_P(reg) \
+ lw reg, MULTIPLE_THREADS_OFFSET(tp)
+#endif
+
+#elif !defined __ASSEMBLER__
+
+# define SINGLE_THREAD_P 1
+# define NO_CANCELLATION 1
+
+#endif
+
+#ifndef __ASSEMBLER__
+# define RTLD_SINGLE_THREAD_P \
+ __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+ header.multiple_threads) == 0, 1)
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/ucontext-macros.h b/sysdeps/unix/sysv/linux/riscv/ucontext-macros.h
new file mode 100644
index 000000000000..9d4e8ffcde8f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ucontext-macros.h
@@ -0,0 +1,49 @@
+/* Macros for ucontext routines.
+ Copyright (C) 2017 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _LINUX_RISCV_UCONTEXT_MACROS_H
+#define _LINUX_RISCV_UCONTEXT_MACROS_H
+
+#include <sysdep.h>
+#include <sys/asm.h>
+
+#include "ucontext_i.h"
+
+#define MCONTEXT_FSR (32 * SZFREG + MCONTEXT_FPREGS)
+
+#define SAVE_FP_REG(name, num, base) \
+ FREG_S name, ((num) * SZFREG + MCONTEXT_FPREGS)(base)
+
+#define RESTORE_FP_REG(name, num, base) \
+ FREG_L name, ((num) * SZFREG + MCONTEXT_FPREGS)(base)
+
+#define RESTORE_FP_REG_CFI(name, num, base) \
+ RESTORE_FP_REG (name, num, base); \
+ cfi_offset (name, (num) * SZFREG + MCONTEXT_FPREGS)
+
+#define SAVE_INT_REG(name, num, base) \
+ REG_S name, ((num) * SZREG + MCONTEXT_GREGS)(base)
+
+#define RESTORE_INT_REG(name, num, base) \
+ REG_L name, ((num) * SZREG + MCONTEXT_GREGS)(base)
+
+#define RESTORE_INT_REG_CFI(name, num, base) \
+ RESTORE_INT_REG (name, num, base); \
+ cfi_offset (name, (num) * SZREG + MCONTEXT_GREGS)
+
+#endif /* _LINUX_RISCV_UCONTEXT_MACROS_H */
diff --git a/sysdeps/unix/sysv/linux/riscv/ucontext_i.sym b/sysdeps/unix/sysv/linux/riscv/ucontext_i.sym
new file mode 100644
index 000000000000..f30ba391827c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ucontext_i.sym
@@ -0,0 +1,31 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+-- Constants used by the rt_sigprocmask call.
+
+SIG_BLOCK
+SIG_SETMASK
+
+_NSIG8 (_NSIG / 8)
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+#define stack(member) ucontext (uc_stack.member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+
+UCONTEXT_FLAGS ucontext (uc_flags)
+UCONTEXT_LINK ucontext (uc_link)
+UCONTEXT_STACK ucontext (uc_stack)
+UCONTEXT_MCONTEXT ucontext (uc_mcontext)
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+
+STACK_SP stack (ss_sp)
+STACK_SIZE stack (ss_size)
+STACK_FLAGS stack (ss_flags)
+
+MCONTEXT_GREGS mcontext (gregs)
+MCONTEXT_FPREGS mcontext (fpregs)
+
+UCONTEXT_SIZE sizeof (ucontext_t)
--
2.13.6