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fb86edea20
* sysdeps/unix/sysv/linux/hppa/sysdep.h: Fix merge error.
420 lines
13 KiB
C
420 lines
13 KiB
C
/* Assembler macros for PA-RISC.
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Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
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Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <asm/unistd.h>
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#include <sysdeps/generic/sysdep.h>
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#include <sys/syscall.h>
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#include "config.h"
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#ifndef ASM_LINE_SEP
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# define ASM_LINE_SEP ;
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#endif
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#undef SYS_ify
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#define SYS_ify(syscall_name) (__NR_##syscall_name)
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#ifdef PIC
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/* WARNING: CANNOT BE USED IN A NOP! */
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# define STW_PIC stw %r19, -32(%sr0, %sp) ASM_LINE_SEP
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# define LDW_PIC ldw -32(%sr0, %sp), %r19 ASM_LINE_SEP
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# define STW_ASM_PIC " copy %%r19, %%r4\n"
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# define LDW_ASM_PIC " copy %%r4, %%r19\n"
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# define USING_GR4 "%r4",
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#else
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# define STW_PIC ASM_LINE_SEP
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# define LDW_PIC ASM_LINE_SEP
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# define STW_ASM_PIC " \n"
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# define LDW_ASM_PIC " \n"
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# define USING_GR4
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#endif
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#ifdef __ASSEMBLER__
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/* Syntactic details of assembler. */
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#define ALIGNARG(log2) log2
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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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/* We don't want the label for the error handle to be global when we define
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it here. */
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#ifdef PIC
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# define SYSCALL_ERROR_LABEL 0f
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#else
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# define SYSCALL_ERROR_LABEL syscall_error
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#endif
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/* Define an entry point visible from C.
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There is currently a bug in gdb which prevents us from specifying
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incomplete stabs information. Fake some entries here which specify
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the current source file. */
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#define ENTRY(name) \
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.text ASM_LINE_SEP \
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.export C_SYMBOL_NAME(name) ASM_LINE_SEP \
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.type C_SYMBOL_NAME(name),@function ASM_LINE_SEP \
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C_LABEL(name) ASM_LINE_SEP \
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CALL_MCOUNT ASM_LINE_SEP
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#undef END
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#define END(name) \
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1: ASM_LINE_SEP \
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.size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name) ASM_LINE_SEP
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/* If compiled for profiling, call `mcount' at the start of each function. */
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/* No, don't bother. gcc will put the call in for us. */
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#define CALL_MCOUNT /* Do nothing. */
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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 means
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ENTRY(name)
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DO_CALL(...)
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nop
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bv 0(2)
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nop
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*/
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#define PSEUDO(name, syscall_name, args) \
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ENTRY (name) \
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DO_CALL(syscall_name, args) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#define ret \
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/* Return value set by ERRNO code */ ASM_LINE_SEP \
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bv 0(2) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END (name)
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/* We don't set the errno on the return from the syscall */
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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ENTRY (name) \
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DO_CALL_NOERRNO(syscall_name, args) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#define ret_NOERRNO ret
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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/* This has to return the error value */
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#undef PSEUDO_ERRVAL
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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ENTRY(name) \
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DO_CALL_ERRVAL(syscall_name, args) ASM_LINE_SEP \
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nop ASM_LINE_SEP
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#define ret_ERRVAL ret
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#undef PSEUDO_END_ERRVAL
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#define PSEUDO_END_ERRVAL(name) \
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END(name)
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#undef JUMPTARGET
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#define JUMPTARGET(name) name
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#define SYSCALL_PIC_SETUP /* Nothing. */
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/* All the syscall assembly macros rely on finding the approriate
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SYSCALL_ERROR_LABEL or rather HANDLER. */
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/* int * __errno_location(void) so you have to store your value
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into the return address! */
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#define DEFAULT_SYSCALL_ERROR_HANDLER \
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.import __errno_location,code ASM_LINE_SEP \
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/* branch to errno handler */ ASM_LINE_SEP \
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bl __errno_location,%rp ASM_LINE_SEP
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/* Here are the myriad of configuration options that the above can
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work for... what we've done is provide the framework for future
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changes if required to each section */
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#ifdef PIC
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else /* !RTLD_PRIVATE_ERRNO */
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# if defined _LIBC_REENTRANT
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else /* !_LIBC_REENTRANT */
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# endif /* _LIBC_REENTRANT */
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# endif /* RTLD_PRIVATE_ERRNO */
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#else
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# ifndef _LIBC_REENTRANT
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# else
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# define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
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# endif
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#endif
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/* Linux takes system call arguments in registers:
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syscall number gr20
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arg 1 gr26
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arg 2 gr25
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arg 3 gr24
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arg 4 gr23
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arg 5 gr22
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arg 6 gr21
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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 gr26
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arg 2 gr25
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arg 3 gr24
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arg 4 gr23
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arg 5 -52(gr30)
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arg 6 -56(gr30)
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gr22 and gr21 are caller-saves, so we can just load the arguments
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there and generally be happy. */
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/* the cmpb...no_error code below inside DO_CALL
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* is intended to mimic the if (__sys_res...)
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* code inside INLINE_SYSCALL
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*/
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#undef DO_CALL
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#define DO_CALL(syscall_name, args) \
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DOARGS_##args ASM_LINE_SEP \
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STW_PIC ASM_LINE_SEP \
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/* Do syscall, delay loads # */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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ldi -0x1000,%r1 ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
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/* save rp or we get lost */ ASM_LINE_SEP \
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stw %rp, -20(%sr0,%sp) ASM_LINE_SEP \
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/* Restore r19 from frame */ ASM_LINE_SEP \
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LDW_PIC ASM_LINE_SEP \
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stw %ret0, -24(%sr0,%sp) ASM_LINE_SEP \
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SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
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/* create frame */ ASM_LINE_SEP \
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ldo 64(%sp), %sp ASM_LINE_SEP \
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ldo -64(%sp), %sp ASM_LINE_SEP \
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/* OPTIMIZE: Don't reload r19 */ ASM_LINE_SEP \
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/* do a -1*syscall_ret0 */ ASM_LINE_SEP \
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ldw -24(%sr0,%sp), %r26 ASM_LINE_SEP \
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sub %r0, %r26, %r26 ASM_LINE_SEP \
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/* Store into errno location */ ASM_LINE_SEP \
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stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
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/* return -1 as error */ ASM_LINE_SEP \
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ldo -1(%r0), %ret0 ASM_LINE_SEP \
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ldw -20(%sr0,%sp), %rp ASM_LINE_SEP \
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0: ASM_LINE_SEP \
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UNDOARGS_##args ASM_LINE_SEP
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/* We do nothing with the return, except hand it back to someone else */
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#undef DO_CALL_NOERRNO
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#define DO_CALL_NOERRNO(syscall_name, args) \
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DOARGS_##args \
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/* No need to store r19 */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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/* Caller will restore r19 */ ASM_LINE_SEP \
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UNDOARGS_##args
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/* Here, we return the ERRVAL in assembly, note we don't call the
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error handler function, but we do 'negate' the return _IF_
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it's an error. Not sure if this is the right semantic. */
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#undef DO_CALL_ERRVAL
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#define DO_CALL_ERRVAL(syscall_name, args) \
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DOARGS_##args ASM_LINE_SEP \
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/* No need to store r19 */ ASM_LINE_SEP \
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ble 0x100(%sr2,%r0) ASM_LINE_SEP \
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ldi SYS_ify (syscall_name), %r20 ASM_LINE_SEP \
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/* Caller will restore r19 */ ASM_LINE_SEP \
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ldi -0x1000,%r1 ASM_LINE_SEP \
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cmpb,>>=,n %r1,%ret0,0f ASM_LINE_SEP \
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sub %r0, %ret0, %ret0 ASM_LINE_SEP \
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0: ASM_LINE_SEP \
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UNDOARGS_##args ASM_LINE_SEP
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#define DOARGS_0 /* nothing */
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#define DOARGS_1 /* nothing */
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#define DOARGS_2 /* nothing */
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#define DOARGS_3 /* nothing */
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#define DOARGS_4 /* nothing */
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#define DOARGS_5 ldw -52(%r30), %r22 ASM_LINE_SEP
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#define DOARGS_6 ldw -52(%r30), %r22 ASM_LINE_SEP \
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ldw -56(%r30), %r21 ASM_LINE_SEP
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#define UNDOARGS_0 /* nothing */
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#define UNDOARGS_1 /* nothing */
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#define UNDOARGS_2 /* nothing */
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#define UNDOARGS_3 /* nothing */
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#define UNDOARGS_4 /* nothing */
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#define UNDOARGS_5 /* nothing */
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#define UNDOARGS_6 /* nothing */
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#else
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/* GCC has to be warned that a syscall may clobber all the ABI
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registers listed as "caller-saves", see page 8, Table 2
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in section 2.2.6 of the PA-RISC RUN-TIME architecture
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document. However! r28 is the result and will conflict with
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the clobber list so it is left out. Also the input arguments
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registers r20 -> r26 will conflict with the list so they
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are treated specially. Although r19 is clobbered by the syscall
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we cannot say this because it would violate ABI, thus we say
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r4 is clobbered and use that register to save/restore r19
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across the syscall. */
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#define CALL_CLOB_REGS "%r1", "%r2", USING_GR4 \
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"%r20", "%r29", "%r31"
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) ({ \
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long __sys_res; \
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{ \
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register unsigned long __res asm("r28"); \
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LOAD_ARGS_##nr(args) \
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/* FIXME: HACK stw/ldw r19 around syscall */ \
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asm volatile( \
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STW_ASM_PIC \
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" ble 0x100(%%sr2, %%r0)\n" \
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" ldi %1, %%r20\n" \
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LDW_ASM_PIC \
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: "=r" (__res) \
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: "i" (SYS_ify(name)) ASM_ARGS_##nr \
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: CALL_CLOB_REGS CLOB_ARGS_##nr \
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); \
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__sys_res = (long)__res; \
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} \
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if ( (unsigned long)__sys_res >= (unsigned long)-4095 ){ \
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__set_errno(-__sys_res); \
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__sys_res = -1; \
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} \
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__sys_res; \
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})
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/* INTERNAL_SYSCALL_DECL - Allows us to setup some function static
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value to use within the context of the syscall
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INTERNAL_SYSCALL_ERROR_P - Returns 0 if it wasn't an error, 1 otherwise
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You are allowed to use the syscall result (val) and the DECL error variable
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to determine what went wrong.
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INTERLAL_SYSCALL_ERRNO - Munges the val/err pair into the error number.
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In our case we just flip the sign. */
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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/* Equivalent to (val < 0)&&(val > -4095) which is what we want */
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned long)val >= (unsigned long)-4095)
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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/* Similar to INLINE_SYSCALL but we don't set errno */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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long __sys_res; \
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{ \
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register unsigned long __res asm("r28"); \
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LOAD_ARGS_##nr(args) \
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/* FIXME: HACK stw/ldw r19 around syscall */ \
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asm volatile( \
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STW_ASM_PIC \
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" ble 0x100(%%sr2, %%r0)\n" \
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" ldi %1, %%r20\n" \
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LDW_ASM_PIC \
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: "=r" (__res) \
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: "i" (SYS_ify(name)) ASM_ARGS_##nr \
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: CALL_CLOB_REGS CLOB_ARGS_##nr \
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); \
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__sys_res = (long)__res; \
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} \
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__sys_res; \
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})
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#define LOAD_ARGS_0()
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#define LOAD_ARGS_1(r26) \
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register unsigned long __r26 __asm__("r26") = (unsigned long)r26; \
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LOAD_ARGS_0()
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#define LOAD_ARGS_2(r26,r25) \
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register unsigned long __r25 __asm__("r25") = (unsigned long)r25; \
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LOAD_ARGS_1(r26)
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#define LOAD_ARGS_3(r26,r25,r24) \
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register unsigned long __r24 __asm__("r24") = (unsigned long)r24; \
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LOAD_ARGS_2(r26,r25)
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#define LOAD_ARGS_4(r26,r25,r24,r23) \
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register unsigned long __r23 __asm__("r23") = (unsigned long)r23; \
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LOAD_ARGS_3(r26,r25,r24)
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#define LOAD_ARGS_5(r26,r25,r24,r23,r22) \
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register unsigned long __r22 __asm__("r22") = (unsigned long)r22; \
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LOAD_ARGS_4(r26,r25,r24,r23)
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#define LOAD_ARGS_6(r26,r25,r24,r23,r22,r21) \
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register unsigned long __r21 __asm__("r21") = (unsigned long)r21; \
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LOAD_ARGS_5(r26,r25,r24,r23,r22)
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/* Even with zero args we use r20 for the syscall number */
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#define ASM_ARGS_0
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#define ASM_ARGS_1 ASM_ARGS_0, "r" (__r26)
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#define ASM_ARGS_2 ASM_ARGS_1, "r" (__r25)
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#define ASM_ARGS_3 ASM_ARGS_2, "r" (__r24)
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#define ASM_ARGS_4 ASM_ARGS_3, "r" (__r23)
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#define ASM_ARGS_5 ASM_ARGS_4, "r" (__r22)
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#define ASM_ARGS_6 ASM_ARGS_5, "r" (__r21)
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/* The registers not listed as inputs but clobbered */
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#define CLOB_ARGS_6
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#define CLOB_ARGS_5 CLOB_ARGS_6, "%r21"
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#define CLOB_ARGS_4 CLOB_ARGS_5, "%r22"
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#define CLOB_ARGS_3 CLOB_ARGS_4, "%r23"
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#define CLOB_ARGS_2 CLOB_ARGS_3, "%r24"
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#define CLOB_ARGS_1 CLOB_ARGS_2, "%r25"
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#define CLOB_ARGS_0 CLOB_ARGS_1, "%r26"
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#endif /* __ASSEMBLER__ */
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