risc-v: initial 64 bit port, static only (no TLS/NPTL)

Only a simple hello world is tested in qemu system emulation.

1 files changed, 57 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/riscv64/__longjmp.S b/libc/sysdeps/linux/riscv64/__longjmp.S
new file mode 100644
index 000000000..6079f98c1
--- /dev/null
+++ b/libc/sysdeps/linux/riscv64/__longjmp.S
@@ -0,0 +1,57 @@
+/* longjmp, RISC-V version.
+   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+
+ENTRY (__longjmp)
+	REG_L ra,  0*SZREG(a0)
+	REG_L s0,  1*SZREG(a0)
+	REG_L s1,  2*SZREG(a0)
+	REG_L s2,  3*SZREG(a0)
+	REG_L s3,  4*SZREG(a0)
+	REG_L s4,  5*SZREG(a0)
+	REG_L s5,  6*SZREG(a0)
+	REG_L s6,  7*SZREG(a0)
+	REG_L s7,  8*SZREG(a0)
+	REG_L s8,  9*SZREG(a0)
+	REG_L s9, 10*SZREG(a0)
+	REG_L s10,11*SZREG(a0)
+	REG_L s11,12*SZREG(a0)
+	REG_L sp, 13*SZREG(a0)
+
+#ifndef __riscv_float_abi_soft
+	FREG_L fs0, 14*SZREG+ 0*SZFREG(a0)
+	FREG_L fs1, 14*SZREG+ 1*SZFREG(a0)
+	FREG_L fs2, 14*SZREG+ 2*SZFREG(a0)
+	FREG_L fs3, 14*SZREG+ 3*SZFREG(a0)
+	FREG_L fs4, 14*SZREG+ 4*SZFREG(a0)
+	FREG_L fs5, 14*SZREG+ 5*SZFREG(a0)
+	FREG_L fs6, 14*SZREG+ 6*SZFREG(a0)
+	FREG_L fs7, 14*SZREG+ 7*SZFREG(a0)
+	FREG_L fs8, 14*SZREG+ 8*SZFREG(a0)
+	FREG_L fs9, 14*SZREG+ 9*SZFREG(a0)
+	FREG_L fs10,14*SZREG+10*SZFREG(a0)
+	FREG_L fs11,14*SZREG+11*SZFREG(a0)
+#endif
+
+	seqz a0, a1
+	add  a0, a0, a1   # a0 = (a1 == 0) ? 1 : a1
+	ret
+
+END (__longjmp)
+libc_hidden_def(__longjmp)