/* Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Written by Jes Sorensen, , April 1999. Based on code originally written by David Mosberger-Tang 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 #include /* 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 #ifdef __STDC__ # define SYS_ify(syscall_name) __NR_##syscall_name #else # define SYS_ify(syscall_name) __NR_/**/syscall_name #endif /* This is a kludge to make syscalls.list find these under the names pread and pwrite, since some kernel headers define those names and some define the *64 names for the same system calls. */ #if !defined __NR_pread && defined __NR_pread64 # define __NR_pread __NR_pread64 #endif #if !defined __NR_pwrite && defined __NR_pwrite64 # define __NR_pwrite __NR_pwrite64 #endif #ifdef __ASSEMBLER__ #undef CALL_MCOUNT #ifdef PROF # define CALL_MCOUNT \ .data; \ 1: data8 0; /* XXX fixme: use .xdata8 once labels work */ \ .previous; \ .prologue; \ .save ar.pfs, r40; \ alloc out0 = ar.pfs, 8, 0, 4, 0; \ mov out1 = gp; \ .save rp, out2; \ mov out2 = rp; \ .body; \ ;; \ addl out3 = @ltoff(1b), gp; \ br.call.sptk.many rp = _mcount \ ;; #else # define CALL_MCOUNT /* Do nothing. */ #endif /* 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 %d0 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. */ /* We don't want the label for the error handler to be visible in the symbol table when we define it here. */ #define SYSCALL_ERROR_LABEL __syscall_error #undef PSEUDO #define PSEUDO(name, syscall_name, args) \ ENTRY(name) \ DO_CALL (SYS_ify(syscall_name)); \ cmp.eq p6,p0=-1,r10; \ (p6) br.cond.spnt.few __syscall_error; #define DO_CALL(num) \ mov r15=num; \ break __BREAK_SYSCALL; #undef PSEUDO_END #define PSEUDO_END(name) .endp C_SYMBOL_NAME(name); #undef END #define END(name) \ .size C_SYMBOL_NAME(name), . - C_SYMBOL_NAME(name) ; \ .endp C_SYMBOL_NAME(name) #define ret br.ret.sptk.few b0 #else /* not __ASSEMBLER__ */ /* On IA-64 we have stacked registers for passing arguments. The "out" registers end up being the called function's "in" registers. Also, since we have plenty of registers we have two return values from a syscall. r10 is set to -1 on error, whilst r8 contains the (non-negative) errno on error or the return value on success. */ #undef INLINE_SYSCALL #define INLINE_SYSCALL(name, nr, args...) \ ({ \ register long _r8 asm ("r8"); \ register long _r10 asm ("r10"); \ register long _r15 asm ("r15") = __NR_##name; \ long _retval; \ LOAD_ARGS_##nr (args); \ __asm __volatile ("break %3;;\n\t" \ : "=r" (_r8), "=r" (_r10), "=r" (_r15) \ : "i" (__BREAK_SYSCALL), "2" (_r15) \ ASM_ARGS_##nr \ : "memory" ASM_CLOBBERS_##nr); \ _retval = _r8; \ if (_r10 == -1) \ { \ __set_errno (_retval); \ _retval = -1; \ } \ _retval; }) #undef INTERNAL_SYSCALL #define INTERNAL_SYSCALL(name, nr, args...) \ ({ \ register long _r8 asm ("r8"); \ register long _r10 asm ("r10"); \ register long _r15 asm ("r15") = __NR_##name; \ long _retval; \ LOAD_ARGS_##nr (args); \ __asm __volatile ("break %3;;\n\t" \ : "=r" (_r8), "=r" (_r10), "=r" (_r15) \ : "i" (__BREAK_SYSCALL), "2" (_r15) \ ASM_ARGS_##nr \ : "memory" ASM_CLOBBERS_##nr); \ _retval = _r8; \ if (_r10 == -1) \ _retval = -_retval; \ _retval; }) #undef INTERNAL_SYSCALL_ERROR_P #define INTERNAL_SYSCALL_ERROR_P(val) ((unsigned long) (val) >= -4095UL) #undef INTERNAL_SYSCALL_ERRNO #define INTERNAL_SYSCALL_ERRNO(val) (-(val)) #define LOAD_ARGS_0() do { } while (0) #define LOAD_ARGS_1(out0) \ register long _out0 asm ("out0") = (long) (out0); \ LOAD_ARGS_0 () #define LOAD_ARGS_2(out0, out1) \ register long _out1 asm ("out1") = (long) (out1); \ LOAD_ARGS_1 (out0) #define LOAD_ARGS_3(out0, out1, out2) \ register long _out2 asm ("out2") = (long) (out2); \ LOAD_ARGS_2 (out0, out1) #define LOAD_ARGS_4(out0, out1, out2, out3) \ register long _out3 asm ("out3") = (long) (out3); \ LOAD_ARGS_3 (out0, out1, out2) #define LOAD_ARGS_5(out0, out1, out2, out3, out4) \ register long _out4 asm ("out4") = (long) (out4); \ LOAD_ARGS_4 (out0, out1, out2, out3) #define ASM_ARGS_0 #define ASM_ARGS_1 ASM_ARGS_0, "r" (_out0) #define ASM_ARGS_2 ASM_ARGS_1, "r" (_out1) #define ASM_ARGS_3 ASM_ARGS_2, "r" (_out2) #define ASM_ARGS_4 ASM_ARGS_3, "r" (_out3) #define ASM_ARGS_5 ASM_ARGS_4, "r" (_out4) #define ASM_CLOBBERS_0 ASM_CLOBBERS_1, "out0" #define ASM_CLOBBERS_1 ASM_CLOBBERS_2, "out1" #define ASM_CLOBBERS_2 ASM_CLOBBERS_3, "out2" #define ASM_CLOBBERS_3 ASM_CLOBBERS_4, "out3" #define ASM_CLOBBERS_4 ASM_CLOBBERS_5, "out4" #define ASM_CLOBBERS_5 , "out5", "out6", "out7", \ /* Non-stacked integer registers, minus r8, r10, r15. */ \ "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", \ "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", \ "r28", "r29", "r30", "r31", \ /* Predicate registers. */ \ "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", \ /* Non-rotating fp registers. */ \ "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ /* Branch registers. */ \ "b6", "b7" #endif /* not __ASSEMBLER__ */