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215 lines
6.6 KiB
C
215 lines
6.6 KiB
C
/* Assembler macros for CRIS.
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Copyright (C) 1999, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <asm/unistd.h>
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#include <sysdeps/cris/sysdep.h>
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#include <sys/syscall.h>
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#include "config.h"
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#undef SYS_ify
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#define SYS_ify(syscall_name) (__NR_##syscall_name)
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#ifdef __ASSEMBLER__
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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/* ELF-like local names start with `.L'. */
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#undef L
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#define L(name) .L##name
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/* Linux uses a negative return value to indicate syscall errors,
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unlike most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be
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negative even if the call succeeded. E.g., the `lseek' system call
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might return a large offset. Therefore we must not anymore test
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for < 0, but test for a real error by making sure the value in %eax
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is a real error number. Linus said he will make sure the no syscall
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returns a value in -1 .. -4095 as a valid result so we can safely
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test with -4095. */
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/* Syscall wrappers consist of
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#include <sysdep.h>
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PSEUDO (...)
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ret
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PSEUDO_END (...)
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which expand to the following. */
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/* Linux takes system call arguments in registers:
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syscall number R9
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arg 1 R10
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arg 2 R11
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arg 3 R12
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arg 4 R13
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arg 5 MOF
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arg 6 SRP
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The compiler calls us by the C convention:
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syscall number in the DO_CALL macro
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arg 1 R10
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arg 2 R11
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arg 3 R12
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arg 4 R13
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arg 5 [SP]
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arg 6 [SP + 4]
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*/
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/* Note that we use "bhs", since we want to match
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(unsigned) -4096 .. 0xffffffff. Using "ble" would match
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-4096 .. -2**31. */
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#define PSEUDO(name, syscall_name, args) \
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ENTRY (name) @ \
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DOARGS_##args @ \
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movu.w SYS_ify (syscall_name),$r9 @ \
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break 13 @ \
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cmps.w -4096,$r10 @ \
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bhs 0f @ \
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nop @ \
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UNDOARGS_return_##args
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/* Ouch! We have to remember not to use "ret" in assembly-code.
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("Luckily", mnemonics are case-insensitive.)
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Note that we assume usage is exactly:
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PSEUDO (...)
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ret
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PSEUDO_END (...)
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so we can put all payload into PSEUDO (except for error handling). */
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#define ret
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#define PSEUDO_END(name) \
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0: @ \
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SETUP_PIC @ \
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PLTJUMP (syscall_error) @ \
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END (name)
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#define DOARGS_0
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#define DOARGS_1
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#define DOARGS_2
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#define DOARGS_3
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#define DOARGS_4
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#define DOARGS_5 \
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move [$sp],$mof
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/* To avoid allocating stack-space, we re-use the arg 5 (MOF) entry by
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storing SRP into it. If called with too-few arguments, we will crash,
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but that will happen in the general case too. */
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#define DOARGS_6 \
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DOARGS_5 @ \
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move $srp,[$sp] @ \
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move [$sp+4],$srp
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#define UNDOARGS_return_0 \
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Ret @ \
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nop
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#define UNDOARGS_return_1 UNDOARGS_return_0
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#define UNDOARGS_return_2 UNDOARGS_return_0
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#define UNDOARGS_return_3 UNDOARGS_return_0
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#define UNDOARGS_return_4 UNDOARGS_return_0
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#define UNDOARGS_return_5 UNDOARGS_return_0
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/* We assume the following code will be "ret" and "PSEUDO_END". */
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#define UNDOARGS_return_return_6 \
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jump [$sp]
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#else /* not __ASSEMBLER__ */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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unsigned long __sys_res; \
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register unsigned long __res asm ("r10"); \
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LOAD_ARGS_c_##nr (args) \
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register unsigned long __callno asm ("r9") \
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= SYS_ify (name); \
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asm volatile (LOAD_ARGS_asm_##nr (args) \
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"break 13" \
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: "=r" (__res) \
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: ASM_ARGS_##nr (args) \
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: ASM_CLOBBER_##nr); \
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__sys_res = __res; \
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\
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if (__sys_res >= (unsigned long) -4096) \
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{ \
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__set_errno (- __sys_res); \
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__sys_res = (unsigned long) -1; \
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} \
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__sys_res; \
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})
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#define LOAD_ARGS_c_0()
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#define LOAD_ARGS_asm_0()
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#define ASM_CLOBBER_0 "memory"
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#define ASM_ARGS_0() "r" (__callno)
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#define LOAD_ARGS_c_1(r10) \
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LOAD_ARGS_c_0() \
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register unsigned long __r10 __asm__ ("r10") = (unsigned long) (r10);
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#define LOAD_ARGS_asm_1(r10) LOAD_ARGS_asm_0 ()
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#define ASM_CLOBBER_1 ASM_CLOBBER_0
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#define ASM_ARGS_1(r10) ASM_ARGS_0 (), "0" (__r10)
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#define LOAD_ARGS_c_2(r10, r11) \
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LOAD_ARGS_c_1(r10) \
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register unsigned long __r11 __asm__ ("r11") = (unsigned long) (r11);
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#define LOAD_ARGS_asm_2(r10, r11) LOAD_ARGS_asm_1 (r10)
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#define ASM_CLOBBER_2 ASM_CLOBBER_1
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#define ASM_ARGS_2(r10, r11) ASM_ARGS_1 (r10), "r" (__r11)
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#define LOAD_ARGS_c_3(r10, r11, r12) \
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LOAD_ARGS_c_2(r10, r11) \
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register unsigned long __r12 __asm__ ("r12") = (unsigned long) (r12);
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#define LOAD_ARGS_asm_3(r10, r11, r12) LOAD_ARGS_asm_2 (r10, r11)
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#define ASM_CLOBBER_3 ASM_CLOBBER_2
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#define ASM_ARGS_3(r10, r11, r12) ASM_ARGS_2 (r10, r11), "r" (__r12)
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#define LOAD_ARGS_c_4(r10, r11, r12, r13) \
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LOAD_ARGS_c_3(r10, r11, r12) \
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register unsigned long __r13 __asm__ ("r13") = (unsigned long) (r13);
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#define LOAD_ARGS_asm_4(r10, r11, r12, r13) LOAD_ARGS_asm_3 (r10, r11, r12)
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#define ASM_CLOBBER_4 ASM_CLOBBER_3
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#define ASM_ARGS_4(r10, r11, r12, r13) ASM_ARGS_3 (r10, r11, r12), "r" (__r13)
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#define LOAD_ARGS_c_5(r10, r11, r12, r13, mof) \
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LOAD_ARGS_c_4(r10, r11, r12, r13)
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#define LOAD_ARGS_asm_5(r10, r11, r12, r13, mof) \
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LOAD_ARGS_asm_4 (r10, r11, r12, r13) "move %5,$mof\n\t"
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#define ASM_CLOBBER_5 ASM_CLOBBER_4
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#define ASM_ARGS_5(r10, r11, r12, r13, mof) \
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ASM_ARGS_4 (r10, r11, r12, r13), "g" (mof)
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#define LOAD_ARGS_c_6(r10, r11, r12, r13, mof, srp) \
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LOAD_ARGS_c_5(r10, r11, r12, r13, mof)
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#define LOAD_ARGS_asm_6(r10, r11, r12, r13, mof, srp) \
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LOAD_ARGS_asm_5(r10, r11, r12, r13, mof) \
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"move %6,$srp\n\t"
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#define ASM_CLOBBER_6 ASM_CLOBBER_5, "srp"
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#define ASM_ARGS_6(r10, r11, r12, r13, mof, srp) \
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ASM_ARGS_5 (r10, r11, r12, r13, mof), "g" (srp)
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#endif /* not __ASSEMBLER__ */
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