mirror of
git://sourceware.org/git/newlib-cygwin.git
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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
174 lines
2.3 KiB
ArmAsm
174 lines
2.3 KiB
ArmAsm
/*
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* ====================================================
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* Copyright (C) 1998, 2002 by Red Hat Inc. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "i386mach.h"
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.global SYM (memmove)
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SOTYPE_FUNCTION(memmove)
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SYM (memmove):
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#ifdef __iamcu__
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pushl esi
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pushl edi
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movl eax,edi
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movl edx,esi
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cmp esi,edi
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ja .Lcopy_backward
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je .Lbwd_write_0bytes
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rep movsb
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popl edi
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popl esi
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ret
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.Lcopy_backward:
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lea -1(edi,ecx),edi
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lea -1(esi,ecx),esi
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std
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rep movsb
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cld
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.Lbwd_write_0bytes:
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popl edi
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popl esi
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#else
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pushl ebp
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movl esp,ebp
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pushl esi
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pushl edi
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pushl ebx
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movl 8(ebp),edi
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movl 16(ebp),ecx
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movl 12(ebp),esi
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/* check for destructive overlap (src < dst && dst < src + length) */
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cld
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cmpl edi,esi
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jae .L2
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leal -1(ecx,esi),ebx
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cmpl ebx,edi
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ja .L2
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/* IF: destructive overlap, must copy backwards */
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addl ecx,esi
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addl ecx,edi
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std
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#ifndef __OPTIMIZE_SIZE__
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cmpl $8,ecx
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jbe .L13
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.L18:
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/* move trailing bytes in reverse until destination address is long word aligned */
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movl edi,edx
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movl ecx,ebx
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andl $3,edx
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jz .L21
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movl edx,ecx
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decl esi
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decl edi
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subl ecx,ebx
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rep
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movsb
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mov ebx,ecx
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incl esi
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incl edi
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.L21:
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/* move bytes in reverse, a long word at a time */
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shrl $2,ecx
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subl $4,esi
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subl $4,edi
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rep
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movsl
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addl $4,esi
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addl $4,edi
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movl ebx,ecx
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andl $3,ecx
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#endif /* !__OPTIMIZE_SIZE__ */
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/* handle any remaining bytes not on a long word boundary */
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.L13:
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decl esi
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decl edi
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.L15:
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rep
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movsb
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jmp .L5
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.p2align 4,,7
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/* ELSE: no destructive overlap so we copy forwards */
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.L2:
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#ifndef __OPTIMIZE_SIZE__
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cmpl $8,ecx
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jbe .L3
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/* move any preceding bytes until destination address is long word aligned */
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movl edi,edx
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movl ecx,ebx
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andl $3,edx
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jz .L11
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movl $4,ecx
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subl edx,ecx
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andl $3,ecx
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subl ecx,ebx
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rep
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movsb
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mov ebx,ecx
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/* move bytes a long word at a time */
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.L11:
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shrl $2,ecx
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.p2align 2
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rep
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movsl
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movl ebx,ecx
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andl $3,ecx
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#endif /* !__OPTIMIZE_SIZE__ */
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/* handle any remaining bytes */
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.L3:
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rep
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movsb
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.L5:
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movl 8(ebp),eax
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cld
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leal -12(ebp),esp
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popl ebx
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popl edi
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popl esi
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leave
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#endif
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ret
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