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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2018-02-04 15:34:18 +0000
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2018-03-12 20:11:14 +0100
commit490e84f5e146485a26dea2f41279a4ff13aaca05 (patch)
tree03b9eab7297c5ad571b548b5ed916f17be78bf48 /libc/sysdeps/linux/tile/sysdep.h
parent6e627523ee4b3fc00c30dcff74c2adf93e2b6840 (diff)
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.
Diffstat (limited to 'libc/sysdeps/linux/tile/sysdep.h')
-rw-r--r--libc/sysdeps/linux/tile/sysdep.h118
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__ */