diff options
Diffstat (limited to 'libexec/rtld-elf/mips/rtld_start.S')
| -rw-r--r-- | libexec/rtld-elf/mips/rtld_start.S | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/libexec/rtld-elf/mips/rtld_start.S b/libexec/rtld-elf/mips/rtld_start.S new file mode 100644 index 000000000000..138729dcaee3 --- /dev/null +++ b/libexec/rtld-elf/mips/rtld_start.S @@ -0,0 +1,127 @@ +/* $NetBSD: rtld_start.S,v 1.9 2002/10/05 11:59:05 mycroft Exp $ */ +/* $FreeBSD$ */ + +/* + * Copyright 1997 Michael L. Hitch <mhitch@montana.edu> + * Portions copyright 2002 Charles M. Hannum <root@ihack.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. 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. + */ + +#include <machine/asm.h> + +.globl _C_LABEL(_rtld_relocate_nonplt_self) +.globl _C_LABEL(_rtld) + +LEAF(rtld_start) + .abicalls + .set noreorder + + .cpload t9 + addu sp, sp, -16 /* adjust stack pointer */ + /* keep it aligned */ + .cprestore 0 /* -> 0(sp) for gp */ + /* -> 4(sp) for atexit */ + /* -> 8(sp) for obj_main */ + move s0,a0 /* save stack pointer from a0 */ + move s1,a3 /* save ps_strings pointer */ + + la a1, 1f + bal 1f + nop +1: subu a1, ra, a1 /* relocbase */ + la t9,_C_LABEL(_rtld_relocate_nonplt_self) + move s2,a1 + la a0,_DYNAMIC + addu t9, a1, t9 + jalr t9 + addu a0, a1, a0 /* &_DYNAMIC */ + + + move a0, s0 /* stack pointer */ + addu a1, sp, 4 /* &exit_proc */ + addu a2, sp, 8 /* &objp */ + addu sp, sp, -16 /* arguments slot */ + jal _C_LABEL(_rtld) /* v0 = _rtld(sp, exit_proc, objp) */ + nop + addu sp, sp, 16 + + move a0, s0 /* arguments pointer */ + move a3, s1 /* arguments pointer */ + lw a1, 4(sp) /* our atexit function */ + lw a2, 8(sp) /* obj_main entry */ + addu sp, sp, 16 /* readjust stack */ + move t9,v0 + move a2,s1 /* restore ps_strings */ + jr t9 /* _start(ap, cleanup, obj, ps_strings); */ + nop + +END(rtld_start) + + .globl _rtld_bind_start + .ent _rtld_bind_start +_rtld_bind_start: + /* ABI conventions for stubs: + * t8 contains symbol index + * t7 contains return address + */ + .frame sp, 0, ra /* satisfy compiler */ + + move v1,gp /* save old GP */ + add t9,8 /* modify T9 to point at .cpload */ + .cpload t9 + subu sp,48 /* save arguments and sp value */ + .cprestore 36 + sw a0,16(sp) + sw a1,20(sp) + sw a2,24(sp) + sw a3,28(sp) + sw s0,32(sp) + sw t7,40(sp) + move s0,sp + move a0,v1 /* old GP */ + subu a0,a0,0x7ff0 /* The offset of $gp from the */ + /* beginning of the .got section: */ + /* $gp = .got + 0x7ff0, so */ + /* .got = $gp - 0x7ff0 */ + /* Simple math as you can see. */ + + lw a0,4(a0) /* object = pltgot[1] & 0x7fffffff */ + and a0,a0,0x7fffffff + move a1,t8 /* symbol index */ + + jal _C_LABEL(_mips_rtld_bind) + nop + move sp,s0 + lw ra,40(sp) + lw a0,16(sp) + lw a1,20(sp) + lw a2,24(sp) + lw a3,28(sp) + lw s0,32(sp) + addu sp,48 + move t9,v0 + jr t9 + nop + .end _rtld_bind_start |