Sorry, previously send the preprocessed version of in_cksum.c: What really needs to be replaced is for example: 408 if (mlen >= 16) { 409 ADD(0); 410 ADDC(4); 411 ADDC(8); 412 ADDC(12); 413 MOP; 414 w += 8; 415 mlen -= 16; 416 } On Mon, 9 Jul 2007 10:55:47 +0800 zhouyi zhou <zhouzhouyi_at_FreeBSD.org> wrote: > Hey, > Since FreeBSD update gcc from 3.4.x to 4.2.0, the FreeBSD gdb remote debugger in i386 platform > will find the TCP/UPD checksum will not be computed right, when calling macro in_cksum > which calls in_cksum_skip in src/sys/i386/i386/in_cksum.c in case of getting rid of -O flag > supplied to gcc when compiling(The optimize will interfere with comfortable gdb debugging). > > The reason is for example in src/sys/i386/i386/in_cksum.c: > 126 if (mlen >= 16) { > 127 __asm volatile ("addl %1, %0" : "+r" (sum) : "g" (((const unsigned int *)w)[0 / 4])); > 128 __asm volatile ("adcl %1, %0" : "+r" (sum) : "g" (((const unsigned int *)w)[4 / 4])); > 129 __asm volatile ("adcl %1, %0" : "+r" (sum) : "g" (((const unsigned int *)w)[8 / 4])); > 130 __asm volatile ("adcl %1, %0" : "+r" (sum) : "g" (((const unsigned int *)w)[12 / 4])); > 131 __asm volatile ("adcl $0, %0" : "+r" (sum)); > 132 w += 8; > 133 mlen -= 16; > 134 } >Received on Mon Jul 09 2007 - 01:14:13 UTC
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