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|
/* $OpenBSD: ldasm.S,v 1.12 2002/07/12 20:18:30 drahn Exp $ */
/* $NetBSD: rtld_start.S,v 1.5 2001/08/14 22:17:48 eeh Exp $ */
/*
* Copyright (c) 2001 Jason L. Wright (jason@thought.net)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jason L. Wright
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 2000 Eduardo Horvath.
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas and Paul Kranenburg.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/syscall.h>
#include <machine/trap.h>
#include <machine/asm.h>
#define _LOCORE
#include <machine/frame.h>
/*
* ELF:
* On startup the stack should contain 16 extended word register save area,
* followed by the arg count, etc.
*
* _rtld() expects the stack pointer to point to two longwords for argument
* return followed by argc, etc. We need to create a pointer to
* &argc + 16 and pass that in. The return args will be in those locations.
*
* NB: We are violating the ELF spec by passing a pointer to the ps strings in
* %g1 instead of a termination routine.
*/
/* Offset of ARGC from bottom of stack */
#define ARGC (16*8)
/* XXX - DL_DATA_SIZE should be (9*8), but I can't think right now. */
#define DL_DATA_SIZE (16*8)
.section ".text"
.align 16
.global _dl_start
.type _dl_start,@function
_dl_start:
sub %g0, %g0, %fp ! clear frame
mov %g1, %l1 ! save ps_strings
sub %sp, DL_DATA_SIZE, %sp ! make room for dl_data
add %sp, BIAS + ARGC, %l3
add %l3, DL_DATA_SIZE, %o0
mov 0, %o2 ! dynp = 0
mov %o0, %l0
call _dl_boot_bind ! _dl_boot_bind(sp,loff,dynp,dl_data)
mov %l3, %o3
mov %l3, %o4
ldx [%l0], %l3 ! argc = *sp
sllx %l3, 3, %l3 ! argc *= sizeof(long)
addx %l0, 8, %o0 ! argv = [sp + argc]
addx %l0, 16, %o1 ! envp = sp + 16 +
addx %o1, %l3, %o1 ! + argc
addx %o4, (7*8), %l2
ldx [%l2], %o2 ! loff = dl_data[AUX_base];
call _dl_boot ! _dl_boot(argv,envp,loff,dynp,dl_data)
mov 0, %o3 ! dynp = 0
add %sp, DL_DATA_SIZE, %sp ! restore stack
mov %l1, %g1 ! restore ps_strings
jmp %o0
nop
/*
* We have two separate entry points to the runtime linker.
* I'm implementing this following the SPARC v9 ABI spec.
*
* _dl_bind_start_0(x, y) is called from .PLT0, and is used for
* PLT entries above 32768.
*
* _dl_bind_start_1(x, y) is called from .PLT1, and is used for
* PLT entries below 32768.
*
* The first two entries of PLT2 contain the xword object pointer.
*
* These routines are called with two longword arguments,
* x and y. To calculate the address of the entry,
* _dl_bind_start_1(x, y) does:
*
* n = x >> 15;
*
* and _dl_bind_start_0(x, y) does:
*
* i = x - y + 1048596;
* n = 32768 + (i/5120)*160 + (i%5120)/24;
*
* Neither routine needs to issue a save since it's already been
* done in the PLT entry.
*/
/* NOTE: _dl_bind_start_0 is untested. Hence the debug stuff */
.section ".text"
.align 4
.global _dl_bind_start_0
.type _dl_bind_start_0,@function
_dl_bind_start_0: # (x, y)
#if 0
call _dl_bind_start_0_stub
ldx [%o1 + (10*4)], %l7
mov %o0, %o1
call _dl_bind
mov %l7, %o0
#else
sethi %hi(1048596), %l1
sub %o0, %o1, %l0 /* x - y */
or %l1, %lo(1048596), %l1
add %l0, %l1, %l0 /* x - y + 1048596 */
sdivx %l0, 5120, %l1 /* Calculate i/5120 */
ldx [%o1 + (10*4)], %o0 /* Load object pointer from PLT2 */
sub %l0, %l1, %l2 /* And i%5120 */
/* Let the division churn for a bit. */
sdivx %l2, 14, %l4 /* (i%5120)/24 */
/* 160 is (32 * 5) or (32 * (4 + 1)) */
sllx %l1, 2, %l3 /* 4 * (i/5120) */
add %l1, %l3, %l3 /* 5 * (i/5120) */
sllx %l3, 5, %l3 /* 32 * 5 * (i/5120) */
sethi %hi(32768), %l6
add %l3, %l4, %l5 /* %l5 = (i/5120)*160 + (i%5120)/24; */
add %l5, %l6, %l5
call _dl_bind /* Call _dl_bind(obj, offset) */
mov %l5, %o1
jmp %o0 /* return value == function address */
restore /* Dump our stack frame */
#endif
.section ".text"
.align 4
.global _dl_bind_start_1
.type _dl_bind_start_1,@function
_dl_bind_start_1: # (x, y)
srax %o0, 15, %o2 /* %o0 is the index to our PLT slot */
ldx [%o1 + 8], %o0 /* The object pointer is at [%o1 + 8] */
call _dl_bind /* Call _dl_bind(obj, offset) */
mov %o2, %o1
jmp %o0 /* return value == function address */
restore /* Dump our stack frame */
.section ".text"
.align 4
.global _dl_close
.type _dl_close,@function
_dl_close:
mov SYS_close | SYSCALL_G2RFLAG, %g1 ! call sys_close
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_exit
.type _dl_exit,@function
_dl_exit:
mov SYS_exit | SYSCALL_G2RFLAG, %g1 ! call sys_exit
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_issetugid
.type _dl_issetugid,@function
_dl_issetugid:
mov SYS_issetugid | SYSCALL_G2RFLAG, %g1
add %o7, 8, %g2
t ST_SYSCALL
retl
sub %g0, %o0, %o0
.section ".text"
.align 4
.global _dl__syscall
.type _dl__syscall,@function
_dl__syscall:
mov SYS___syscall | SYSCALL_G2RFLAG, %g1 ! call sys_exit
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_munmap
.type _dl_munmap,@function
_dl_munmap:
mov SYS_munmap | SYSCALL_G2RFLAG, %g1 ! calling sys_mmap
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_mprotect
.type _dl_mprotect,@function
_dl_mprotect:
mov SYS_mprotect | SYSCALL_G2RFLAG, %g1 ! calling sys_mprotect
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_open
.type _dl_open,@function
_dl_open:
mov SYS_open | SYSCALL_G2RFLAG, %g1 ! calling sys_open
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_read
.type _dl_read,@function
_dl_read:
mov SYS_read | SYSCALL_G2RFLAG, %g1 ! calling sys_read
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_write
.type _dl_write,@function
_dl_write:
mov SYS_write | SYSCALL_G2RFLAG, %g1 ! calling sys_write
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.global _dl_stat
.type _dl_stat,@function
_dl_stat:
mov SYS_stat | SYSCALL_G2RFLAG, %g1 ! call sys_stat
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.globl _dl_fstat
.type _dl_fstat,@function
_dl_fstat:
mov SYS_fstat | SYSCALL_G2RFLAG, %g1 ! call sys_fstat
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.globl _dl_fcntl
.type _dl_fcntl,@function
_dl_fcntl:
mov SYS_fcntl | SYSCALL_G2RFLAG, %g1 ! call sys_fstat
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
.section ".text"
.align 4
.globl _dl_getdirentries
.type _dl_getdirentries,@function
_dl_getdirentries:
mov SYS_getdirentries | SYSCALL_G2RFLAG, %g1 ! call sys_fstat
add %o7, 8, %g2 ! just return on success
t ST_SYSCALL ! off to wonderland
retl
sub %g0, %o0, %o0 ! error: result = -errno
|
