mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
227 lines
6.8 KiB
C
227 lines
6.8 KiB
C
/* Assembler macros for CRIS.
|
|
Copyright (C) 1999, 2001, 2003 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 <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 PSEUDO_NOERRNO(name, syscall_name, args) \
|
|
ENTRY (name) @ \
|
|
DOARGS_##args @ \
|
|
movu.w SYS_ify (syscall_name),$r9 @ \
|
|
break 13 @ \
|
|
UNDOARGS_return_##args
|
|
|
|
#define ret_NOERRNO
|
|
|
|
#define PSEUDO_END_NOERRNO(name) \
|
|
END (name)
|
|
|
|
#define DOARGS_0
|
|
#define DOARGS_1
|
|
#define DOARGS_2
|
|
#define DOARGS_3
|
|
#define DOARGS_4
|
|
#define DOARGS_5 \
|
|
move [$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; \
|
|
} \
|
|
(long int) __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 %6,$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 %7,$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__ */
|