diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sh/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sh/sysdep.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sh/sysdep.h b/sysdeps/unix/sysv/linux/sh/sysdep.h new file mode 100644 index 0000000000..6024b9fdac --- /dev/null +++ b/sysdeps/unix/sysv/linux/sh/sysdep.h @@ -0,0 +1,132 @@ +/* Copyright (C) 1992, 93, 95-99, 2000 Free Software Foundation, + Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. + Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _LINUX_SH_SYSDEP_H +#define _LINUX_SH_SYSDEP_H 1 + +/* There is some commonality. */ +#include <sysdeps/unix/sh/sysdep.h> + +/* 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) + + +#ifdef __ASSEMBLER__ + +/* 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 _IMM12 #-12 +#undef PSEUDO +#ifdef SHARED +#define PSEUDO(name, syscall_name, args) \ + .text; \ + ENTRY (name); \ + DO_CALL (args, syscall_name); \ + mov r0,r1; \ + mov _IMM12,r2; \ + shad r2,r1; \ + not r1,r1; \ + tst r1,r1; \ + bf 1f; \ + mov r0,r4; \ + mov.l r12,@-r15; \ + sts.l pr,@-r15; \ + mov.l 0f,r12; \ + mova 0f,r0; \ + add r0,r12; \ + mov.l 2f,r1; \ + mova 2f,r0; \ + add r0,r1; \ + jsr @r1; \ + nop; \ + lds.l @r15+,pr; \ + rts; \ + mov.l @r15+,r12; \ + .align 2; \ + 2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \ + 0: .long _GLOBAL_OFFSET_TABLE_; \ + 1: +#else +#define PSEUDO(name, syscall_name, args) \ + .text; \ + ENTRY (name); \ + DO_CALL (args, syscall_name); \ + mov r0,r1; \ + mov _IMM12,r2; \ + shad r2,r1; \ + not r1,r1; \ + tst r1,r1; \ + bf 1f; \ + mov.l 2f,r1; \ + jmp @r1; \ + mov r0, r4; \ + .align 2; \ + 2: .long PLTJMP(C_SYMBOL_NAME(__syscall_error)); \ + 1: +#endif + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER \ + END (name) + +#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ + +#define SYSCALL_INST0 trapa #0 +#define SYSCALL_INST1 trapa #0 +#define SYSCALL_INST2 trapa #0 +#define SYSCALL_INST3 trapa #0 +#define SYSCALL_INST4 trapa #0 +#define SYSCALL_INST5 trapa #1 +#define SYSCALL_INST6 trapa #2 + +#undef DO_CALL +#define DO_CALL(args, syscall_name) \ + mov.l 1f,r0; \ + SYSCALL_INST##args; \ + bra 2f; \ + nop; \ + .align 2; \ + 1: .long SYS_ify(syscall_name); \ + 2: + +#else /* not __ASSEMBLER__ */ + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + __syscall_##name(args) + +#endif /* __ASSEMBLER__ */ + +#endif /* linux/sh/sysdep.h */ |