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authorPalmer Dabbelt <palmer@dabbelt.com>2018-01-29 10:28:32 -0800
committerPalmer Dabbelt <palmer@dabbelt.com>2018-01-29 10:37:27 -0800
commit7f33b09c65e3fdb6b6a1af8816918bcce977b38a (patch)
tree820a99249081334d21f7a4eb7fa621c05d2337ca
parent36960f0c763a904d6d1f028e2c33b7bbe43c2a3a (diff)
RISC-V: Linux ABI
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. 2018-01-29 Palmer Dabbelt <palmer@sifive.com> * sysdeps/riscv/nptl/pthread-offsets.h: New file. * sysdeps/riscv/nptl/pthreaddef.h: Likewise. * sysdeps/unix/sysv/linux/riscv/bits/fcntl.h: Likewise. * sysdeps/unix/sysv/linux/riscv/bits/mman.h: Likewise. * sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h: Likewise. * sysdeps/unix/sysv/linux/riscv/dl-cache.h: Likewise. * sysdeps/unix/sysv/linux/riscv/flush-icache.c: Likewise. * sysdeps/unix/sysv/linux/riscv/getcontext.S: Likewise. * sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise. * sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise. * sysdeps/unix/sysv/linux/riscv/makecontext.c: Likewise. * sysdeps/unix/sysv/linux/riscv/readelflib.c: Likewise. * sysdeps/unix/sysv/linux/riscv/register-dump.h: Likewise. * sysdeps/unix/sysv/linux/riscv/setcontext.S: Likewise. * sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h: Likewise. * sysdeps/unix/sysv/linux/riscv/swapcontext.S: Likewise. * sysdeps/unix/sysv/linux/riscv/sys/cachectl.h: Likewise. * sysdeps/unix/sysv/linux/riscv/sys/procfs.h: Likewise. * sysdeps/unix/sysv/linux/riscv/sys/ucontext.h: Likewise. * sysdeps/unix/sysv/linux/riscv/sys/user.h: Likewise. * sysdeps/unix/sysv/linux/riscv/ucontext-macros.h: Likewise. * sysdeps/unix/sysv/linux/riscv/ucontext_i.sym: Likewise.
-rw-r--r--ChangeLog22
-rw-r--r--sysdeps/riscv/nptl/pthread-offsets.h24
-rw-r--r--sysdeps/riscv/nptl/pthreaddef.h32
-rw-r--r--sysdeps/unix/sysv/linux/riscv/bits/fcntl.h62
-rw-r--r--sysdeps/unix/sysv/linux/riscv/bits/mman.h36
-rw-r--r--sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h32
-rw-r--r--sysdeps/unix/sysv/linux/riscv/dl-cache.h75
-rw-r--r--sysdeps/unix/sysv/linux/riscv/flush-icache.c73
-rw-r--r--sysdeps/unix/sysv/linux/riscv/getcontext.S77
-rw-r--r--sysdeps/unix/sysv/linux/riscv/init-first.c58
-rw-r--r--sysdeps/unix/sysv/linux/riscv/libc-vdso.h38
-rw-r--r--sysdeps/unix/sysv/linux/riscv/makecontext.c78
-rw-r--r--sysdeps/unix/sysv/linux/riscv/readelflib.c96
-rw-r--r--sysdeps/unix/sysv/linux/riscv/register-dump.h63
-rw-r--r--sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h53
-rw-r--r--sysdeps/unix/sysv/linux/riscv/setcontext.S114
-rw-r--r--sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h28
-rw-r--r--sysdeps/unix/sysv/linux/riscv/swapcontext.S125
-rw-r--r--sysdeps/unix/sysv/linux/riscv/sys/cachectl.h32
-rw-r--r--sysdeps/unix/sysv/linux/riscv/sys/procfs.h114
-rw-r--r--sysdeps/unix/sysv/linux/riscv/sys/ucontext.h110
-rw-r--r--sysdeps/unix/sysv/linux/riscv/sys/user.h23
-rw-r--r--sysdeps/unix/sysv/linux/riscv/ucontext-macros.h49
-rw-r--r--sysdeps/unix/sysv/linux/riscv/ucontext_i.sym31
24 files changed, 1445 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index 7264430fad..4c340138a3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -105,6 +105,28 @@
* sysdeps/unix/sysv/linux/riscv/sysdep.S: Likewise.
* sysdeps/unix/sysv/linux/riscv/sysdep.h: Likewise.
* sysdeps/unix/sysv/linux/riscv/vfork.S: Likewise.
+ * sysdeps/riscv/nptl/pthread-offsets.h: New file.
+ * sysdeps/riscv/nptl/pthreaddef.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/bits/fcntl.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/bits/mman.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/dl-cache.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/flush-icache.c: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/getcontext.S: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/makecontext.c: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/readelflib.c: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/register-dump.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/setcontext.S: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/swapcontext.S: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/sys/cachectl.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/sys/procfs.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/sys/ucontext.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/sys/user.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/ucontext-macros.h: Likewise.
+ * sysdeps/unix/sysv/linux/riscv/ucontext_i.sym: Likewise.
2018-01-29 Florian Weimer <fweimer@redhat.com>
diff --git a/sysdeps/riscv/nptl/pthread-offsets.h b/sysdeps/riscv/nptl/pthread-offsets.h
new file mode 100644
index 0000000000..5f7031834f
--- /dev/null
+++ b/sysdeps/riscv/nptl/pthread-offsets.h
@@ -0,0 +1,24 @@
+/* RISC-V pthread offsets
+ Copyright (C) 2017-2018 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 0000000000..442422aefb
--- /dev/null
+++ b/sysdeps/riscv/nptl/pthreaddef.h
@@ -0,0 +1,32 @@
+/* pthread machine parameter definitions, RISC-V version.
+ Copyright (C) 2011-2018 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/bits/fcntl.h b/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
new file mode 100644
index 0000000000..6bea085c70
--- /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) 2011-2018 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 0000000000..0e64f1eea7
--- /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) 1997-2018 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 0000000000..9b896a6262
--- /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) 1996-2018 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 int gregs[32];
+ unsigned long long int fpregs[66] __attribute__ ((__aligned__ (16)));
+};
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/riscv/dl-cache.h b/sysdeps/unix/sysv/linux/riscv/dl-cache.h
new file mode 100644
index 0000000000..cbd6ef5e09
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/dl-cache.h
@@ -0,0 +1,75 @@
+/* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
+ Copyright (C) 2003-2018 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 <ldconfig.h>
+
+/* For now we only support the natural XLEN ABI length on all targets, so the
+ only bits that need to go into ld.so.cache are the FLEG ABI length. */
+#if defined __riscv_float_abi_double
+# define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_DOUBLE | FLAG_ELF_LIBC6)
+#else
+# define _DL_CACHE_DEFAULT_ID (FLAG_RISCV_FLOAT_ABI_SOFT | FLAG_ELF_LIBC6)
+#endif
+
+#define _dl_cache_check_flags(flags) \
+ ((flags) == _DL_CACHE_DEFAULT_ID)
+
+/* If given a path to one of our library directories, adds every library
+ directory via add_dir (), otherwise just adds the giver directory. On
+ RISC-V, libraries can be found in paths ending in:
+ - /lib64/lp64d
+ - /lib64/lp64
+ - /lib (only ld.so)
+ so this will add all of those paths.
+
+ According to Joseph Myers:
+ My reasoning for that would be: generic autoconf-configured (etc.)
+ software may only know about using the lib directory, so you want the
+ lib directory to be searched regardless of the ABI - but it's also
+ useful to be able to e.g. list /usr/local/lib in /etc/ld.so.conf for all
+ architectures and have that automatically imply /usr/local/lib64/lp64d
+ etc. so that libraries can be found that come from software that does
+ use the ABI-specific directories. */
+#define add_system_dir(dir) \
+ do \
+ { \
+ size_t len = strlen (dir); \
+ char path[len + 9]; \
+ memcpy (path, dir, len + 1); \
+ if (len >= 12 && ! memcmp(path + len - 12, "/lib64/lp64d", 12)) \
+ { \
+ len -= 8; \
+ path[len] = '\0'; \
+ } \
+ if (len >= 11 && ! memcmp(path + len - 11, "/lib64/lp64", 11)) \
+ { \
+ len -= 7; \
+ path[len] = '\0'; \
+ } \
+ add_dir (path); \
+ if (len >= 4 && ! memcmp(path + len - 4, "/lib", 4)) \
+ { \
+ memcpy (path + len, "64/lp64d", 9); \
+ add_dir (path); \
+ memcpy (path + len, "64/lp64", 8); \
+ add_dir (path); \
+ } \
+ } while (0)
+
+
+#include_next <dl-cache.h>
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 0000000000..d612ef4c6c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c
@@ -0,0 +1,73 @@
+/* RISC-V instruction cache flushing VDSO calls
+ Copyright (C) 2017-2018 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>
+#include <asm/syscalls.h>
+
+typedef int (*func_type) (void *, void *, unsigned long int);
+
+static int
+__riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags)
+{
+ return INLINE_SYSCALL (riscv_flush_icache, 3, start, end, flags);
+}
+
+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);
+
+ /* If there is no vDSO entry then call the system call directly. All Linux
+ versions provide the vDSO entry, but QEMU's user-mode emulation doesn't
+ provide a vDSO. */
+ if (!func)
+ func = &__riscv_flush_icache_syscall;
+
+ 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 int flags)
+{
+ static volatile func_type cached_func;
+
+ func_type func = atomic_load_relaxed (&cached_func);
+
+ if (!func)
+ {
+ func = __lookup_riscv_flush_icache ();
+ atomic_store_relaxed (&cached_func, func);
+ }
+
+ 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 0000000000..bde350f721
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/getcontext.S
@@ -0,0 +1,77 @@
+/* Save current context.
+ Copyright (C) 2009-2018 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 by overwriting a0. */
+ 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 0000000000..56abe51d96
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/init-first.c
@@ -0,0 +1,58 @@
+/* RISC-V VDSO initialization
+ Copyright (C) 2017-2018 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 int (*VDSO_SYMBOL (getcpu)) (unsigned int *, unsigned int *, void *)
+ attribute_hidden;
+long int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
+ attribute_hidden;
+long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
+ attribute_hidden;
+long int (*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 0000000000..1d44b34e02
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/libc-vdso.h
@@ -0,0 +1,38 @@
+/* RISC-V VDSO function declarations
+ Copyright (C) 2017-2018 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 int (*VDSO_SYMBOL (getcpu)) (unsigned int *, unsigned int *, void *)
+ attribute_hidden;
+extern long int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
+ attribute_hidden;
+extern long int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
+ attribute_hidden;
+extern long int (*VDSO_SYMBOL (clock_getres)) (clockid_t, struct timespec *)
+ attribute_hidden;
+
+#endif
+
+#endif /* _LIBC_VDSO_H */
diff --git a/sysdeps/unix/sysv/linux/riscv/makecontext.c b/sysdeps/unix/sysv/linux/riscv/makecontext.c
new file mode 100644
index 0000000000..b8054a29b0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/makecontext.c
@@ -0,0 +1,78 @@
+/* Create new context. RISC-V version.
+ Copyright (C) 2001-2018 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 int a0, long int a1, long int a2, long int a3, long int a4,
+ ...)
+{
+ extern void __start_context (void) attribute_hidden;
+ long int i, sp;
+
+ _Static_assert (REG_NARGS == 8, "__makecontext assumes 8 argument registers");
+
+ /* Set up the stack. */
+ sp = ((long int) 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[REG_RA] = 0;
+ ucp->uc_mcontext.__gregs[REG_S0] = 0;
+ ucp->uc_mcontext.__gregs[REG_S1] = (long int) func;
+ ucp->uc_mcontext.__gregs[REG_S2] = (long int) ucp->uc_link;
+ ucp->uc_mcontext.__gregs[REG_SP] = sp;
+ ucp->uc_mcontext.__gregs[REG_PC] = (long int) &__start_context;
+
+ /* Put args in a0-a7, then put any remaining args on the stack. */
+ ucp->uc_mcontext.__gregs[REG_A0 + 0] = a0;
+ ucp->uc_mcontext.__gregs[REG_A0 + 1] = a1;
+ ucp->uc_mcontext.__gregs[REG_A0 + 2] = a2;
+ ucp->uc_mcontext.__gregs[REG_A0 + 3] = a3;
+ ucp->uc_mcontext.__gregs[REG_A0 + 4] = a4;
+
+ if (__glibc_unlikely (argc > 5))
+ {
+ va_list vl;
+ va_start (vl, a4);
+
+ long reg_args = argc < REG_NARGS ? argc : REG_NARGS;
+ for (i = 5; i < reg_args; i++)
+ ucp->uc_mcontext.__gregs[REG_A0 + i] = va_arg (vl, long);
+
+ long int stack_args = argc - reg_args;
+ if (stack_args > 0)
+ {
+ sp = (sp - stack_args * sizeof (long int)) & ALMASK;
+ ucp->uc_mcontext.__gregs[REG_SP] = sp;
+ for (i = 0; i < stack_args; i++)
+ ((long int *) sp)[i] = va_arg (vl, long int);
+ }
+
+ va_end (vl);
+ }
+}
+
+weak_alias (__makecontext, makecontext)
diff --git a/sysdeps/unix/sysv/linux/riscv/readelflib.c b/sysdeps/unix/sysv/linux/riscv/readelflib.c
new file mode 100644
index 0000000000..6e249ff82f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/readelflib.c
@@ -0,0 +1,96 @@
+/* Support for reading ELF files.
+ Copyright (C) 1999-2018 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/>. */
+
+
+int process_elf32_file (const char *file_name, const char *lib, int *flag,
+ unsigned int *osversion, char **soname,
+ void *file_contents, size_t file_length);
+int process_elf64_file (const char *file_name, const char *lib, int *flag,
+ unsigned int *osversion, char **soname,
+ void *file_contents, size_t file_length);
+
+/* The ELF flags supported by our current glibc port:
+ - EF_RISCV_FLOAT_ABI: We support the soft and double ABIs.
+ - EF_RISCV_RVC: While the Linux ABI mandates the presence of the C
+ extension, we can still support libraries compiled without that extension
+ so we just ignore this flag.
+ - EF_RISCV_RVE: glibc (and Linux) don't support RV32E based systems.
+ - EF_RISCV_TSO: The TSO extension isn't supported, as doing so would require
+ some mechanism to ensure that the TSO extension is enabled which doesn't
+ currently exist. */
+#define SUPPORTED_ELF_FLAGS (EF_RISCV_FLOAT_ABI | EF_RISCV_RVC)
+
+/* Returns 0 if everything is ok, != 0 in case of error. */
+int
+process_elf_file (const char *file_name, const char *lib, int *flag,
+ unsigned int *osversion, char **soname, void *file_contents,
+ size_t file_length)
+{
+ ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
+ Elf32_Ehdr *elf32_header = (Elf32_Ehdr *) elf_header;
+ int ret;
+ long flags;
+
+ /* RISC-V libraries are always libc.so.6+. */
+ *flag = FLAG_ELF_LIBC6;
+
+ if (elf_header->e_ident [EI_CLASS] == ELFCLASS32)
+ {
+ ret = process_elf32_file (file_name, lib, flag, osversion, soname,
+ file_contents, file_length);
+ flags = elf32_header->e_flags;
+ }
+ else
+ {
+ ret = process_elf64_file (file_name, lib, flag, osversion, soname,
+ file_contents, file_length);
+ flags = elf32_header->e_flags;
+ }
+
+ /* RISC-V linkers encode the floating point ABI as part of the ELF headers. */
+ switch (flags & EF_RISCV_FLOAT_ABI)
+ {
+ case EF_RISCV_FLOAT_ABI_SOFT:
+ *flag |= FLAG_RISCV_FLOAT_ABI_SOFT;
+ break;
+ case EF_RISCV_FLOAT_ABI_DOUBLE:
+ *flag |= FLAG_RISCV_FLOAT_ABI_DOUBLE;
+ break;
+ default:
+ return 1;
+ }
+
+ /* If there are any other ELF flags set then glibc doesn't support this
+ library. */
+ if (flags & ~SUPPORTED_ELF_FLAGS)
+ return 1;
+
+ return ret;
+}
+
+#undef __ELF_NATIVE_CLASS
+#undef process_elf_file
+#define process_elf_file process_elf32_file
+#define __ELF_NATIVE_CLASS 32
+#include "elf/readelflib.c"
+
+#undef __ELF_NATIVE_CLASS
+#undef process_elf_file
+#define process_elf_file process_elf64_file
+#define __ELF_NATIVE_CLASS 64
+#include "elf/readelflib.c"
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 0000000000..234ce630f9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/register-dump.h
@@ -0,0 +1,63 @@
+/* Dump registers.
+ Copyright (C) 2000-2018 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[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/rv64/jmp_buf-macros.h b/sysdeps/unix/sysv/linux/riscv/rv64/jmp_buf-macros.h
new file mode 100644
index 0000000000..34434a8d93
--- /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) 2017-2018 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 0000000000..9f1c7b41fd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/setcontext.S
@@ -0,0 +1,114 @@
+/* Set current context.
+ Copyright (C) 2009-2018 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 /* Save ucp into t0. */
+
+/* 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 0000000000..3ca8a80d8b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sigcontextinfo.h
@@ -0,0 +1,28 @@
+/* RISC-V definitions for signal handling calling conventions.
+ Copyright (C) 2000-2018 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[REG_PC])
+#define GET_FRAME(ctx) ((void *) ctx->uc_mcontext.__gregs[REG_S0])
+#define GET_STACK(ctx) ((void *) ctx->uc_mcontext.__gregs[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 0000000000..75b58dc668
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/swapcontext.S
@@ -0,0 +1,125 @@
+/* Save and set current context.
+ Copyright (C) 2009-2018 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 /* Save ucp into t0. */
+
+ 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 by overwriting a0. */
+ 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, &oucp->uc_sigmask, _NSIG8) */
+ li a3, _NSIG8
+ add a2, a0, UCONTEXT_SIGMASK
+ add a1, t0, 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 0000000000..46a2cb6082
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/cachectl.h
@@ -0,0 +1,32 @@
+/* RISC-V instruction cache flushing interface
+ Copyright (C) 2017-2018 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 int __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 0000000000..518de56741
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/procfs.h
@@ -0,0 +1,114 @@
+/* Core image file related definitions, RISC-V version.
+ Copyright (C) 1996-2018 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 unsigned long int elf_greg_t;
+typedef unsigned long int elf_gregset_t[32];
+typedef union __riscv_mc_fp_state 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 int pr_uid;
+ long int 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. */
+ };
+
+/* The rest of this file provides the types for emulation of the
+ Solaris <proc_service.h> interfaces that should be implemented by
+ users of libthread_db. */
+
+/* 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;
+
+/* Process status and info. In the end we do provide typedefs for them. */
+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 0000000000..7df430b504
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/ucontext.h
@@ -0,0 +1,110 @@
+/* struct ucontext definition, RISC-V version.
+ Copyright (C) 1997-2018 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>
+
+typedef unsigned long int __riscv_mc_gp_state[32];
+
+#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_S1 9
+# define REG_A0 10
+# define REG_S2 18
+# define REG_NARGS 8
+
+typedef unsigned long int greg_t;
+
+/* Container for all general registers. */
+typedef __riscv_mc_gp_state gregset_t;
+
+/* Container for floating-point state. */
+typedef union __riscv_mc_fp_state fpregset_t;
+#endif
+
+struct __riscv_mc_f_ext_state
+ {
+ unsigned int __f[32];
+ unsigned int __fcsr;
+ };
+
+struct __riscv_mc_d_ext_state
+ {
+ unsigned long long int __f[32];
+ unsigned int __fcsr;
+ };
+
+struct __riscv_mc_q_ext_state
+ {
+ unsigned long long int __f[64] __attribute__ ((__aligned__ (16)));
+ unsigned int __fcsr;
+ /* Reserved for expansion of sigcontext structure. Currently zeroed
+ upon signal, and must be zero upon sigreturn. */
+ unsigned int __glibc_reserved[3];
+ };
+
+union __riscv_mc_fp_state
+ {
+ struct __riscv_mc_f_ext_state __f;
+ struct __riscv_mc_d_ext_state __d;
+ struct __riscv_mc_q_ext_state __q;
+ };
+
+typedef struct mcontext_t
+ {
+ __riscv_mc_gp_state __gregs;
+ union __riscv_mc_fp_state __fpregs;
+ } mcontext_t;
+
+/* Userlevel context. */
+typedef struct ucontext_t
+ {
+ unsigned long int __uc_flags;
+ struct ucontext_t *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. */
+ char __glibc_reserved[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 0000000000..7e648f2d5c
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/sys/user.h
@@ -0,0 +1,23 @@
+/* Copyright (C) 2001-2018 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_USER_H
+#define _SYS_USER_H 1
+
+
+
+#endif /* _SYS_USER_H */
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 0000000000..a73c3a9b04
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/riscv/ucontext-macros.h
@@ -0,0 +1,49 @@
+/* Macros for ucontext routines.
+ Copyright (C) 2017-2018 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 0000000000..be55b26310
--- /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)