mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-17 03:49:46 +08:00
5d3ad3b123
Intel MCU System V ABI are incompartible with i386 System V ABI:
o Minimum instruction set is Intel Pentium ISA minus x87 instructions
o No x87 or vector registers
o First three args are passed in %eax, %edx and %ecx
o Full specification available here:
https://github.com/hjl-tools/x86-psABI/wiki/iamcu-psABI-0.7.pdf
newlib/
* configure.host: Add new ix86-*-elfiamcu target
newlib/libc/include/
* setjmp.h: Change _JBLEN for Intel MCU target
newlib/libc/machine/i386/
* memchr.S: (memchr) Target-specific size-optimized version
* memcmp.S: (memcmp) Likewise
* memcpy.S: (memcpy) Likewise
* memmove.S: (memmove) Likewise
* memset.S: (memset) Likewise
* setjmp.S: (setjmp) Likewise
* strchr.S: (strchr) Likewise
* strlen.S: (strlen) Likewise
newlib/libc/stdlib/
* srtold.c: (__flt_rounds) Disable for Intel MCU
105 lines
1.7 KiB
ArmAsm
105 lines
1.7 KiB
ArmAsm
/*
|
|
* ====================================================
|
|
* Copyright (C) 1998, 2002 by Red Hat Inc. All rights reserved.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include "i386mach.h"
|
|
|
|
.global SYM (memcmp)
|
|
SOTYPE_FUNCTION(memcmp)
|
|
|
|
SYM (memcmp):
|
|
|
|
#ifdef __iamcu__
|
|
pushl edi
|
|
pushl esi
|
|
movl eax,edi
|
|
movl edx,esi
|
|
cld
|
|
|
|
/* check if length is zero in which case just return 0 */
|
|
|
|
xorl eax,eax
|
|
testl ecx,ecx
|
|
jz L4
|
|
|
|
/* compare any unaligned bytes or remainder bytes */
|
|
repz
|
|
cmpsb
|
|
|
|
/* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */
|
|
xorl edx,edx
|
|
movb -1(esi),dl
|
|
movb -1(edi),al
|
|
subl edx,eax
|
|
|
|
L4:
|
|
popl esi
|
|
popl edi
|
|
#else
|
|
pushl ebp
|
|
movl esp,ebp
|
|
subl $16,esp
|
|
pushl ebx
|
|
pushl edi
|
|
pushl esi
|
|
movl 8(ebp),edi
|
|
movl 12(ebp),esi
|
|
movl 16(ebp),ecx
|
|
cld
|
|
|
|
/* check if length is zero in which case just return 0 */
|
|
|
|
xorl eax,eax
|
|
testl ecx,ecx
|
|
jz L4
|
|
|
|
#ifndef __OPTIMIZE_SIZE__
|
|
|
|
/* if aligned on long boundary, compare doublewords at a time first */
|
|
|
|
movl edi,eax
|
|
orl esi,eax
|
|
testb $3,al
|
|
jne BYTECMP
|
|
movl ecx,ebx
|
|
shrl $2,ecx /* calculate number of long words to compare */
|
|
repz
|
|
cmpsl
|
|
jz L5
|
|
subl $4,esi
|
|
subl $4,edi
|
|
movl $4,ecx
|
|
jmp BYTECMP
|
|
L5:
|
|
andl $3,ebx /* calculate number of remaining bytes */
|
|
movl ebx,ecx
|
|
|
|
#endif /* not __OPTIMIZE_SIZE__ */
|
|
|
|
BYTECMP: /* compare any unaligned bytes or remainder bytes */
|
|
repz
|
|
cmpsb
|
|
|
|
/* set output to be < 0 if less than, 0 if equal, or > 0 if greater than */
|
|
L3:
|
|
xorl edx,edx
|
|
movb -1(esi),dl
|
|
xorl eax,eax
|
|
movb -1(edi),al
|
|
subl edx,eax
|
|
|
|
L4:
|
|
leal -28(ebp),esp
|
|
popl esi
|
|
popl edi
|
|
popl ebx
|
|
leave
|
|
#endif
|
|
ret
|