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251 lines
7.4 KiB
C
251 lines
7.4 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 __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) \
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CALL_MCOUNT
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#define ret \
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bv 0(2) ASM_LINE_SEP \
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nop
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#define ret_NOERRNO \
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bv 0(2) ASM_LINE_SEP \
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nop
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#undef END
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#define END(name) \
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1: .size C_SYMBOL_NAME(name),1b-C_SYMBOL_NAME(name)
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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
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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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#define PSEUDO_NOERRNO(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
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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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#define JUMPTARGET(name) name
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#define SYSCALL_PIC_SETUP /* Nothing. */
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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 \
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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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stw %rp, -20(%sr0,%r30) ASM_LINE_SEP \
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stw %ret0, -24(%sr0,%r30) ASM_LINE_SEP \
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.import __errno_location,code ASM_LINE_SEP \
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bl __errno_location,%rp ASM_LINE_SEP \
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ldo 64(%r30), %r30 ASM_LINE_SEP \
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ldo -64(%r30), %r30 ASM_LINE_SEP \
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ldw -24(%r30), %r26 ASM_LINE_SEP \
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sub %r0, %r26, %r26 ASM_LINE_SEP \
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stw %r26, 0(%sr0,%ret0) ASM_LINE_SEP \
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ldo -1(%r0), %ret0 ASM_LINE_SEP \
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ldw -20(%r30), %rp ASM_LINE_SEP \
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0: ASM_LINE_SEP \
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UNDOARGS_##args
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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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#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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asm volatile( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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" ldi %1, %%r20" \
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: "=r" (__res) \
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: "i" (SYS_ify(name)) ASM_ARGS_##nr \
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); \
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__sys_res = __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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#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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#define ASM_ARGS_0
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#define ASM_ARGS_1 , "r" (__r26)
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#define ASM_ARGS_2 , "r" (__r26), "r" (__r25)
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#define ASM_ARGS_3 , "r" (__r26), "r" (__r25), "r" (__r24)
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#define ASM_ARGS_4 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23)
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#define ASM_ARGS_5 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22)
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#define ASM_ARGS_6 , "r" (__r26), "r" (__r25), "r" (__r24), "r" (__r23), "r" (__r22), "r" (__r21)
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#endif /* __ASSEMBLER__ */
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