tile: add basic support for tilegx

This adds basic support for tile architecture.
Only static binaries, no ld.so or threading support.
Tested with qemu-tilegx only.

1 files changed, 118 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/tile/sysdep.h b/libc/sysdeps/linux/tile/sysdep.h
new file mode 100644
index 000000000..b9231d7ef
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sysdep.h
@@ -0,0 +1,118 @@
+/* Copyright (C) 2011-2018 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 <common/sysdep.h>
+#include <bits/wordsize.h>
+#include <arch/abi.h>
+
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+#if defined __ASSEMBLER__
+
+/* Make use of .size directive.  */
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
+
+/* Define an entry point visible from C.  */
+#define	ENTRY(name)							      \
+  .globl C_SYMBOL_NAME(name);						      \
+  .type C_SYMBOL_NAME(name),@function;					      \
+  .align 8;								      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+
+#undef	END
+#define END(name)							      \
+  cfi_endproc;								      \
+  ASM_SIZE_DIRECTIVE(name)
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define	syscall_error	__syscall_error
+
+/* Local label name for asm code. */
+#define L(name)		.L##name
+
+/* Specify the size in bytes of a machine register.  */
+#define REGSIZE		8
+
+/* Provide "pointer-oriented" instruction variants.  These differ not
+   just for tilepro vs tilegx, but also for tilegx -m64 vs -m32.  */
+#if __WORDSIZE == 32
+#define ADD_PTR		addx
+#define ADDI_PTR	addxi
+#define ADDLI_PTR	addxli
+#define LD_PTR		ld4s
+#define ST_PTR		st4
+#define SHL_PTR_ADD	shl2add
+#else
+#define ADD_PTR		add
+#define ADDI_PTR	addi
+#define ADDLI_PTR	addli
+#define LD_PTR		LD
+#define ST_PTR		ST
+#define SHL_PTR_ADD	shl3add
+#endif
+
+/* The actual implementation of doing a syscall. */
+#define DO_CALL(syscall_name, args)                     \
+  moveli TREG_SYSCALL_NR_NAME, SYS_ify(syscall_name);	\
+  swint1
+
+/* TILE Linux returns the result in r0 (or a negative errno).
+   The kernel "owns" the code to decide if a given value is an error,
+   and puts errno in r1 if so, or otherwise zero.  */
+#define	PSEUDO(name, syscall_name, args)		\
+  ENTRY	(name);						\
+  DO_CALL(syscall_name, args);				\
+  BNEZ r1, 0f
+
+#define ret  jrp lr
+
+#ifndef SHARED
+/* For static code, on error jump to __syscall_error directly. */
+# define SYSCALL_ERROR_NAME __syscall_error
+#elif IS_IN_libc || IS_IN_libpthread
+/* Use the internal name for libc/libpthread shared objects. */
+# define SYSCALL_ERROR_NAME __GI___syscall_error
+#else
+/* Otherwise, on error do a full PLT jump. */
+# define SYSCALL_ERROR_NAME plt(__syscall_error)
+#endif
+
+#undef PSEUDO_END
+#define	PSEUDO_END(name)				\
+0:							\
+  j SYSCALL_ERROR_NAME;					\
+  END (name)
+
+#undef PSEUDO_NOERRNO
+#define	PSEUDO_NOERRNO(name, syscall_name, args)	\
+  ENTRY	(name);						\
+  DO_CALL(syscall_name, args)
+
+#define ret_NOERRNO  jrp lr
+
+#undef PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name) \
+  END (name)
+
+/* Convenience wrappers. */
+#define SYSCALL__(name, args)   PSEUDO (__##name, name, args)
+#define SYSCALL(name, args)   PSEUDO (name, name, args)
+
+#endif /* __ASSEMBLER__ */