--- /dev/null
+/* 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__ */
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