diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/cris/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/cris/sysdep.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/cris/sysdep.h b/sysdeps/unix/sysv/linux/cris/sysdep.h new file mode 100644 index 0000000000..d388665286 --- /dev/null +++ b/sysdeps/unix/sysv/linux/cris/sysdep.h @@ -0,0 +1,214 @@ +/* Assembler macros for CRIS. + Copyright (C) 1999, 2001 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 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. */ + +#include <asm/unistd.h> +#include <sysdeps/cris/sysdep.h> +#include <sys/syscall.h> +#include "config.h" + +#undef SYS_ify +#define SYS_ify(syscall_name) (__NR_##syscall_name) + + +#ifdef __ASSEMBLER__ + +/* 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 + +/* ELF-like local names start with `.L'. */ +#undef L +#define L(name) .L##name + +/* 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 %eax + 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 safely + test with -4095. */ + +/* Syscall wrappers consist of + #include <sysdep.h> + PSEUDO (...) + ret + PSEUDO_END (...) + + which expand to the following. */ + +/* Linux takes system call arguments in registers: + syscall number R9 + arg 1 R10 + arg 2 R11 + arg 3 R12 + arg 4 R13 + arg 5 MOF + arg 6 SRP + + The compiler calls us by the C convention: + syscall number in the DO_CALL macro + arg 1 R10 + arg 2 R11 + arg 3 R12 + arg 4 R13 + arg 5 [SP] + arg 6 [SP + 4] + */ + +/* Note that we use "bhs", since we want to match + (unsigned) -4096 .. 0xffffffff. Using "ble" would match + -4096 .. -2**31. */ +#define PSEUDO(name, syscall_name, args) \ + ENTRY (name) @ \ + DOARGS_##args @ \ + movu.w SYS_ify (syscall_name),$r9 @ \ + break 13 @ \ + cmps.w -4096,$r10 @ \ + bhs 0f @ \ + nop @ \ + UNDOARGS_return_##args + +/* Ouch! We have to remember not to use "ret" in assembly-code. + ("Luckily", mnemonics are case-insensitive.) + Note that we assume usage is exactly: + PSEUDO (...) + ret + PSEUDO_END (...) + so we can put all payload into PSEUDO (except for error handling). */ + +#define ret + +#define PSEUDO_END(name) \ +0: @ \ + SETUP_PIC @ \ + PLTJUMP (syscall_error) @ \ + END (name) + +#define DOARGS_0 +#define DOARGS_1 +#define DOARGS_2 +#define DOARGS_3 +#define DOARGS_4 +#define DOARGS_5 \ + move [$sp],$mof + +/* To avoid allocating stack-space, we re-use the arg 5 (MOF) entry by + storing SRP into it. If called with too-few arguments, we will crash, + but that will happen in the general case too. */ +#define DOARGS_6 \ + DOARGS_5 @ \ + move $srp,[$sp] @ \ + move [$sp+4],$srp + +#define UNDOARGS_return_0 \ + Ret @ \ + nop + +#define UNDOARGS_return_1 UNDOARGS_return_0 +#define UNDOARGS_return_2 UNDOARGS_return_0 +#define UNDOARGS_return_3 UNDOARGS_return_0 +#define UNDOARGS_return_4 UNDOARGS_return_0 +#define UNDOARGS_return_5 UNDOARGS_return_0 + +/* We assume the following code will be "ret" and "PSEUDO_END". */ +#define UNDOARGS_return_return_6 \ + jump [$sp] + +#else /* not __ASSEMBLER__ */ + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ \ + unsigned long __sys_res; \ + register unsigned long __res asm ("r10"); \ + LOAD_ARGS_c_##nr (args) \ + register unsigned long __callno asm ("r9") \ + = SYS_ify (name); \ + asm volatile (LOAD_ARGS_asm_##nr (args) \ + "break 13" \ + : "=r" (__res) \ + : ASM_ARGS_##nr (args) \ + : ASM_CLOBBER_##nr); \ + __sys_res = __res; \ + \ + if (__sys_res >= (unsigned long) -4096) \ + { \ + __set_errno (- __sys_res); \ + __sys_res = (unsigned long) -1; \ + } \ + __sys_res; \ + }) + +#define LOAD_ARGS_c_0() +#define LOAD_ARGS_asm_0() +#define ASM_CLOBBER_0 "memory" +#define ASM_ARGS_0() "r" (__callno) + +#define LOAD_ARGS_c_1(r10) \ + LOAD_ARGS_c_0() \ + register unsigned long __r10 __asm__ ("r10") = (unsigned long) (r10); +#define LOAD_ARGS_asm_1(r10) LOAD_ARGS_asm_0 () +#define ASM_CLOBBER_1 ASM_CLOBBER_0 +#define ASM_ARGS_1(r10) ASM_ARGS_0 (), "0" (__r10) + +#define LOAD_ARGS_c_2(r10, r11) \ + LOAD_ARGS_c_1(r10) \ + register unsigned long __r11 __asm__ ("r11") = (unsigned long) (r11); +#define LOAD_ARGS_asm_2(r10, r11) LOAD_ARGS_asm_1 (r10) +#define ASM_CLOBBER_2 ASM_CLOBBER_1 +#define ASM_ARGS_2(r10, r11) ASM_ARGS_1 (r10), "r" (__r11) + +#define LOAD_ARGS_c_3(r10, r11, r12) \ + LOAD_ARGS_c_2(r10, r11) \ + register unsigned long __r12 __asm__ ("r12") = (unsigned long) (r12); +#define LOAD_ARGS_asm_3(r10, r11, r12) LOAD_ARGS_asm_2 (r10, r11) +#define ASM_CLOBBER_3 ASM_CLOBBER_2 +#define ASM_ARGS_3(r10, r11, r12) ASM_ARGS_2 (r10, r11), "r" (__r12) + +#define LOAD_ARGS_c_4(r10, r11, r12, r13) \ + LOAD_ARGS_c_3(r10, r11, r12) \ + register unsigned long __r13 __asm__ ("r13") = (unsigned long) (r13); +#define LOAD_ARGS_asm_4(r10, r11, r12, r13) LOAD_ARGS_asm_3 (r10, r11, r12) +#define ASM_CLOBBER_4 ASM_CLOBBER_3 +#define ASM_ARGS_4(r10, r11, r12, r13) ASM_ARGS_3 (r10, r11, r12), "r" (__r13) + +#define LOAD_ARGS_c_5(r10, r11, r12, r13, mof) \ + LOAD_ARGS_c_4(r10, r11, r12, r13) +#define LOAD_ARGS_asm_5(r10, r11, r12, r13, mof) \ + LOAD_ARGS_asm_4 (r10, r11, r12, r13) "move %5,$mof\n\t" +#define ASM_CLOBBER_5 ASM_CLOBBER_4 +#define ASM_ARGS_5(r10, r11, r12, r13, mof) \ + ASM_ARGS_4 (r10, r11, r12, r13), "g" (mof) + +#define LOAD_ARGS_c_6(r10, r11, r12, r13, mof, srp) \ + LOAD_ARGS_c_5(r10, r11, r12, r13, mof) +#define LOAD_ARGS_asm_6(r10, r11, r12, r13, mof, srp) \ + LOAD_ARGS_asm_5(r10, r11, r12, r13, mof) \ + "move %6,$srp\n\t" +#define ASM_CLOBBER_6 ASM_CLOBBER_5, "srp" +#define ASM_ARGS_6(r10, r11, r12, r13, mof, srp) \ + ASM_ARGS_5 (r10, r11, r12, r13, mof), "g" (srp) + +#endif /* not __ASSEMBLER__ */ |