While trying to compile 2.6.38-rc8-00065 on hppa64 with new binutils
2.21.0.20110302 I hit a problem with inline asm in 64-bit variant of
csum_ipv6_magic() with first network driver that used it:
CC [M] drivers/net/atl1c/atl1c_main.o
drivers/net/atl1c/atl1c_main.c:2543: warning: 'atl1c_resume' defined but not used
{standard input}: Assembler messages:
{standard input}:4996: Error: Invalid Add Condition: dc
{standard input}:4997: Error: Invalid Add Condition: dc
{standard input}:4998: Error: Invalid Add Condition: dc
{standard input}:4999: Error: Invalid Add Condition: dc
make[3]: *** [drivers/net/atl1c/atl1c_main.o] Error 1
arch/parisc/include/asm/checksum.h has the corresponding inline asm - it
seems that add,dc is not accepted by the new binutils.
#define _HAVE_ARCH_IPV6_CSUM
static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, unsigned short proto,
__wsum sum)
{
__asm__ __volatile__ (
#if BITS_PER_LONG > 32
/*
** We can execute two loads and two adds per cycle on PA 8000.
** But add insn's get serialized waiting for the carry bit.
** Try to keep 4 registers with "live" values ahead of the ALU.
*/
" ldd,ma 8(%1), %%r19\n" /* get 1st saddr word */
" ldd,ma 8(%2), %%r20\n" /* get 1st daddr word */
" add %8, %3, %3\n"/* add 16-bit proto + len */
" add %%r19, %0, %0\n"
" ldd,ma 8(%1), %%r21\n" /* 2cd saddr */
" ldd,ma 8(%2), %%r22\n" /* 2cd daddr */
" add,dc %%r20, %0, %0\n"
" add,dc %%r21, %0, %0\n"
" add,dc %%r22, %0, %0\n"
" add,dc %3, %0, %0\n" /* fold in proto+len | carry bit */
" extrd,u %0, 31, 32, %%r19\n" /* copy upper half down */
" depdi 0, 31, 32, %0\n" /* clear upper half */
" add %%r19, %0, %0\n" /* fold into 32-bits */
" addc 0, %0, %0\n" /* add carry */
#else
--
Meelis Roos (mroos@xxxxxxxx)
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