2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
89 lines
1.9 KiB
ArmAsm
89 lines
1.9 KiB
ArmAsm
/* oneC_sum() - One complement`s checksum Author: Kees J. Bot */
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/* 9 May 1995 */
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/* See RFC 1071, "Computing the Internet checksum" */
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/* See also the C version of this code. */
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#include <machine/asm.h>
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ENTRY(oneC_sum)
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push %ebp
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movl %esp, %ebp
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push %esi
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push %edi
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movzwl 8(%ebp), %eax /* Checksum of previous block */
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movl 12(%ebp), %esi /* Data to compute checksum over */
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movl 16(%ebp), %edi /* Number of bytes */
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xorl %edx, %edx
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xorb %cl, %cl
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align:
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testl $3, %esi /* Is the data aligned? */
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je aligned
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testl %edi, %edi
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je 0f
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movb (%esi), %dl /* Rotate the first unaligned bytes */
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decl %edi /* into the edx register */
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0:
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incl %esi
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rorl $8, %edx
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rorl $8, %eax /* Rotate the checksum likewise */
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addb $8, %cl /* Number of bits rotated */
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jmp align
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aligned:
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addl %edx, %eax /* Summate the unaligned bytes */
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adcl $0, %eax /* Add carry back in for one`s complement */
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jmp add6test
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_ALIGN_TEXT
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add6:
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addl (%esi), %eax /* Six times unrolled loop, see below */
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adcl 4(%esi), %eax
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adcl 8(%esi), %eax
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adcl 12(%esi), %eax
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adcl 16(%esi), %eax
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adcl 20(%esi), %eax
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adcl $0, %eax
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addl $24, %esi
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add6test:
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subl $24, %edi
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jae add6
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addl $24, %edi
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jmp add1test
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_ALIGN_TEXT
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add1:
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addl (%esi), %eax /* while ((edi -= 4) >= 0) */
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adcl $0, %eax /* eax += *esi++; */
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addl $4, %esi /* edi += 4; */
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add1test:
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subl $4, %edi
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jae add1
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addl $4, %edi
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je done /* Are there extra bytes? */
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movl (%esi), %edx /* Load extra bytes in a full dword */
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andl mask-4(,%edi,4), %edx /* Mask off excess */
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addl %edx, %eax /* Add in the last bits */
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adcl $0, %eax
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done:
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roll %cl, %eax /* Undo the rotation at the beginning */
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movl %eax, %edx
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shrl $16, %eax
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addw %dx, %ax /* Add the two words in eax to form */
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adcw $0, %ax /* a 16 bit sum */
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pop %edi
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pop %esi
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pop %ebp
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ret
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#ifdef __ACK__
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.rom
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#else
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.data
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#endif
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.balign 4
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mask:
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.long 0x000000FF, 0x0000FFFF, 0x00FFFFFF
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/* */
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/* $PchId: oneC_sum.ack.s,v 1.2 1996/03/12 19:33:51 philip Exp $ */
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