[git commit nptl] libc_sh: Add a sysdep header for sh
Carmelo Amoroso
carmelo.amoroso at st.com
Fri Apr 2 16:01:41 UTC 2010
commit: http://git.uclibc.org/uClibc/commit/?id=60972302801d9baf8b4561fab99b2e35e2ddab90
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/nptl
A new sysdep header for sh (ported from NPTL branch) to provide some
useful macros in asm code:
ENTRY: an entry point visible from C
PSEUDO: a wrapper for syscall with proper errno checking
SYSCALL_ERROR_HANDLER: errno check (suitable for TLS)
This will help in NPTL integration.
Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
---
libc/sysdeps/linux/sh/sysdep.h | 277 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 277 insertions(+), 0 deletions(-)
create mode 100644 libc/sysdeps/linux/sh/sysdep.h
diff --git a/libc/sysdeps/linux/sh/sysdep.h b/libc/sysdeps/linux/sh/sysdep.h
new file mode 100644
index 0000000..6f182cd
--- /dev/null
+++ b/libc/sysdeps/linux/sh/sysdep.h
@@ -0,0 +1,277 @@
+/* Assembler macros for SH.
+ Copyright (C) 1999, 2000, 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <common/sysdep.h>
+
+#include <features.h>
+#include <libc-internal.h>
+
+#ifdef __ASSEMBLER__
+
+/* Syntactic details of assembler. */
+
+#define ALIGNARG(log2) log2
+/* For ELF we need the `.type' directive to make shared libs work right. */
+#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,@##typearg;
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
+
+#ifdef SHARED
+#define PLTJMP(_x) _x##@PLT
+#else
+#define PLTJMP(_x) _x
+#endif
+
+/* Define an entry point visible from C. */
+#define ENTRY(name) \
+ ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
+ ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),function) \
+ .align ALIGNARG(5); \
+ C_LABEL(name) \
+ cfi_startproc; \
+ CALL_MCOUNT
+
+#undef END
+#define END(name) \
+ cfi_endproc; \
+ ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(name))
+
+/* If compiled for profiling, call `mcount' at the start of each function. */
+#ifdef PROF
+#define CALL_MCOUNT \
+ mov.l 1f,r1; \
+ sts.l pr, at -r15; \
+ cfi_adjust_cfa_offset (4); \
+ cfi_rel_offset (pr, 0); \
+ mova 2f,r0; \
+ jmp @r1; \
+ lds r0,pr; \
+ .align 2; \
+1: .long mcount; \
+2: lds.l @r15+,pr; \
+ cfi_adjust_cfa_offset (-4); \
+ cfi_restore (pr)
+
+#else
+#define CALL_MCOUNT /* Do nothing. */
+#endif
+
+#ifdef __UCLIBC_UNDERSCORES__
+/* 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
+#define mcount _mcount
+#endif
+
+/* For Linux we can use the system call table in the header file
+ /usr/include/asm/unistd.h
+ of the kernel. But these symbols do not follow the SYS_* syntax
+ so we have to redefine the `SYS_ify' macro here. */
+#undef SYS_ify
+#define SYS_ify(syscall_name) (__NR_##syscall_name)
+
+#define ret rts ; nop
+/* The sh move insn is s, d. */
+#define MOVE(x,y) mov x , y
+
+/* Linux uses a negative return value to indicate syscall errors,
+ unlike most Unices, which use the condition codes' carry flag.
+
+ Since version 2.1 the return value of a system call might be
+ negative even if the call succeeded. E.g., the `lseek' system call
+ might return a large offset. Therefore we must not anymore test
+ for < 0, but test for a real error by making sure the value in R0
+ is a real error number. Linus said he will make sure the no syscall
+ returns a value in -1 .. -4095 as a valid result so we can savely
+ test with -4095. */
+
+#define _IMM1 #-1
+#define _IMM12 #-12
+#undef PSEUDO
+#define PSEUDO(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+ DO_CALL (syscall_name, args); \
+ mov r0,r1; \
+ mov _IMM12,r2; \
+ shad r2,r1; \
+ not r1,r1; \
+ tst r1,r1; \
+ bf .Lpseudo_end; \
+ SYSCALL_ERROR_HANDLER; \
+ .Lpseudo_end:
+
+#undef PSEUDO_END
+#define PSEUDO_END(name) \
+ END (name)
+
+#undef PSEUDO_NOERRNO
+#define PSEUDO_NOERRNO(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+ DO_CALL (syscall_name, args)
+
+#undef PSEUDO_END_NOERRNO
+#define PSEUDO_END_NOERRNO(name) \
+ END (name)
+
+#define ret_NOERRNO ret
+
+#define PSEUDO_ERRVAL(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+ DO_CALL (syscall_name, args);
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(name) \
+ END (name)
+
+#define ret_ERRVAL ret
+
+#ifndef PIC
+# define SYSCALL_ERROR_HANDLER \
+ mov.l 0f,r1; \
+ jmp @r1; \
+ mov r0,r4; \
+ .align 2; \
+ 0: .long __syscall_error
+
+#include <libc/sysdeps/linux/sh/syscall_error.S>
+#else
+# ifdef RTLD_PRIVATE_ERRNO
+
+# define SYSCALL_ERROR_HANDLER \
+ neg r0,r1; \
+ mov.l 0f,r12; \
+ mova 0f,r0; \
+ add r0,r12; \
+ mov.l 1f,r0; \
+ mov.l r1,@(r0,r12)
+ bra .Lpseudo_end; \
+ mov _IMM1,r0; \
+ .align 2; \
+ 0: .long _GLOBAL_OFFSET_TABLE_; \
+ 1: .long rtld_errno at GOTOFF
+
+# elif defined _LIBC_REENTRANT
+
+# if USE___THREAD
+
+# ifndef NOT_IN_libc
+# define SYSCALL_ERROR_ERRNO __libc_errno
+# else
+# define SYSCALL_ERROR_ERRNO errno
+# endif
+# define SYSCALL_ERROR_HANDLER \
+ neg r0,r1; \
+ mov r12,r2; \
+ mov.l 0f,r12; \
+ mova 0f,r0; \
+ add r0,r12; \
+ mov.l 1f,r0; \
+ stc gbr, r4; \
+ mov.l @(r0,r12),r0; \
+ bra .Lskip; \
+ add r4,r0; \
+ .align 2; \
+ 1: .long SYSCALL_ERROR_ERRNO at GOTTPOFF; \
+ .Lskip: \
+ mov r2,r12; \
+ mov.l r1, at r0; \
+ bra .Lpseudo_end; \
+ mov _IMM1,r0; \
+ .align 2; \
+ 0: .long _GLOBAL_OFFSET_TABLE_
+# else
+
+# define SYSCALL_ERROR_HANDLER \
+ neg r0,r1; \
+ mov.l r14, at -r15; \
+ mov.l r12, at -r15; \
+ mov.l r1, at -r15; \
+ mov.l 0f,r12; \
+ mova 0f,r0; \
+ add r0,r12; \
+ sts.l pr, at -r15; \
+ mov r15,r14; \
+ mov.l 1f,r1; \
+ bsrf r1; \
+ nop; \
+ 2: mov r14,r15; \
+ lds.l @r15+,pr; \
+ mov.l @r15+,r1; \
+ mov.l r1, at r0; \
+ mov.l @r15+,r12; \
+ mov.l @r15+,r14; \
+ bra .Lpseudo_end; \
+ mov _IMM1,r0; \
+ .align 2; \
+ 0: .long _GLOBAL_OFFSET_TABLE_; \
+ 1: .long PLTJMP(C_SYMBOL_NAME(__errno_location))-(2b-.)
+/* A quick note: it is assumed that the call to `__errno_location' does
+ not modify the stack! */
+# endif
+# else
+
+/* Store (-r0) into errno through the GOT. */
+# define SYSCALL_ERROR_HANDLER \
+ neg r0,r1; \
+ mov r12,r2; \
+ mov.l 0f,r12; \
+ mova 0f,r0; \
+ add r0,r12; \
+ mov.l 1f,r0; \
+ mov.l @(r0,r12),r0; \
+ mov r2,r12; \
+ mov.l r1, at r0; \
+ bra .Lpseudo_end; \
+ mov _IMM1,r0; \
+ .align 2; \
+ 0: .long _GLOBAL_OFFSET_TABLE_; \
+ 1: .long errno at GOT
+# endif /* _LIBC_REENTRANT */
+#endif /* PIC */
+
+# ifdef __SH4__
+# define SYSCALL_INST_PAD \
+ or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
+# else
+# define SYSCALL_INST_PAD
+# endif
+
+#define SYSCALL_INST0 trapa #0x10
+#define SYSCALL_INST1 trapa #0x11
+#define SYSCALL_INST2 trapa #0x12
+#define SYSCALL_INST3 trapa #0x13
+#define SYSCALL_INST4 trapa #0x14
+#define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15
+#define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16
+
+#undef DO_CALL
+#define DO_CALL(syscall_name, args) \
+ mov.l 1f,r3; \
+ SYSCALL_INST##args; \
+ SYSCALL_INST_PAD; \
+ bra 2f; \
+ nop; \
+ .align 2; \
+ 1: .long SYS_ify (syscall_name); \
+ 2:
+
+#endif /* __ASSEMBLER__ */
--
1.6.3.3
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