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freebsd-skq/lib/csu/i386/crt1_s.S

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Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
/*-
* Copyright 2009 Konstantin Belousov.
* 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.
*
* 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.
*
* $FreeBSD$
*/
Let all .c and .S files under lib/csu consistently use the __FBSDID() macro for identification, instead of several different hand-rolled variants (plain .ident, .ascii, etc).
2010-12-09 21:31:21 +00:00
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
.text
.align 4
.globl _start
.type _start, @function
Add unwind annotations to the asm part of crt1 on i386. Terminate the process with SIGTRAP if _start1() unexpectedly returns. Reviewed by: kan MFC after: 2 weeks
2010-06-18 11:10:39 +00:00
_start:
.cfi_startproc
xorl %ebp,%ebp
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
pushl %ebp
Add unwind annotations to the asm part of crt1 on i386. Terminate the process with SIGTRAP if _start1() unexpectedly returns. Reviewed by: kan MFC after: 2 weeks
2010-06-18 11:10:39 +00:00
.cfi_def_cfa_offset 4
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
movl %esp,%ebp
Add unwind annotations to the asm part of crt1 on i386. Terminate the process with SIGTRAP if _start1() unexpectedly returns. Reviewed by: kan MFC after: 2 weeks
2010-06-18 11:10:39 +00:00
.cfi_offset %ebp,-8
.cfi_def_cfa_register %ebp
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
andl $0xfffffff0,%esp # align stack
leal 8(%ebp),%eax
The (%esp & 0xf) == 0 should be true before the call instruction is executed, for the properly aligned stack. Reported and tested by: rstone Pointy hat to: kib MFC after: 3 days
2011-01-13 23:00:22 +00:00
subl $4,%esp
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
pushl %eax # argv
pushl 4(%ebp) # argc
pushl %edx # rtld cleanup
call _start1
Add unwind annotations to the asm part of crt1 on i386. Terminate the process with SIGTRAP if _start1() unexpectedly returns. Reviewed by: kan MFC after: 2 weeks
2010-06-18 11:10:39 +00:00
int3
.cfi_endproc
Properly support -fPIE by linking PIE binaries with specially-built Scrt1.o instead of crt1.o, since the later is built as non-PIC. Separate i386-elf crt1.c into the pure assembler part and C code, supplying all data extracted by assembler stub as explicit parameters [1]. Hide and localize _start1 symbol used as an interface between asm and C code. In collaboration with: kan Inspired by: PR i386/127387 [1] Prodded and tested by: rdivacky [1] MFC after: 3 weeks
2009-12-02 16:34:20 +00:00
.size _start, . - _start
Add section .note.GNU-stack for assembly files used by 386 and amd64.
2011-01-07 16:07:51 +00:00
.section .note.GNU-stack,"",%progbits
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